/[pcre]/code/trunk/pcre_exec.c
ViewVC logotype

Diff of /code/trunk/pcre_exec.c

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 597 by ph10, Mon May 2 17:08:52 2011 UTC revision 1320 by ph10, Wed May 1 16:39:35 2013 UTC
# Line 6  Line 6 
6  and semantics are as close as possible to those of the Perl 5 language.  and semantics are as close as possible to those of the Perl 5 language.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2010 University of Cambridge             Copyright (c) 1997-2013 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 37  POSSIBILITY OF SUCH DAMAGE. Line 37  POSSIBILITY OF SUCH DAMAGE.
37  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
38  */  */
39    
   
40  /* This module contains pcre_exec(), the externally visible function that does  /* This module contains pcre_exec(), the externally visible function that does
41  pattern matching using an NFA algorithm, trying to mimic Perl as closely as  pattern matching using an NFA algorithm, trying to mimic Perl as closely as
42  possible. There are also some static supporting functions. */  possible. There are also some static supporting functions. */
# Line 57  possible. There are also some static sup Line 56  possible. There are also some static sup
56  #undef min  #undef min
57  #undef max  #undef max
58    
59  /* Flag bits for the match() function */  /* The md->capture_last field uses the lower 16 bits for the last captured
60    substring (which can never be greater than 65535) and a bit in the top half
61    to mean "capture vector overflowed". This odd way of doing things was
62    implemented when it was realized that preserving and restoring the overflow bit
63    whenever the last capture number was saved/restored made for a neater
64    interface, and doing it this way saved on (a) another variable, which would
65    have increased the stack frame size (a big NO-NO in PCRE) and (b) another
66    separate set of save/restore instructions. The following defines are used in
67    implementing this. */
68    
69    #define CAPLMASK    0x0000ffff    /* The bits used for last_capture */
70    #define OVFLMASK    0xffff0000    /* The bits used for the overflow flag */
71    #define OVFLBIT     0x00010000    /* The bit that is set for overflow */
72    
73    /* Values for setting in md->match_function_type to indicate two special types
74    of call to match(). We do it this way to save on using another stack variable,
75    as stack usage is to be discouraged. */
76    
77  #define match_condassert     0x01  /* Called to check a condition assertion */  #define MATCH_CONDASSERT     1  /* Called to check a condition assertion */
78  #define match_cbegroup       0x02  /* Could-be-empty unlimited repeat group */  #define MATCH_CBEGROUP       2  /* Could-be-empty unlimited repeat group */
79    
80  /* Non-error returns from the match() function. Error returns are externally  /* Non-error returns from the match() function. Error returns are externally
81  defined PCRE_ERROR_xxx codes, which are all negative. */  defined PCRE_ERROR_xxx codes, which are all negative. */
# Line 72  defined PCRE_ERROR_xxx codes, which are Line 87  defined PCRE_ERROR_xxx codes, which are
87  negative to avoid the external error codes. */  negative to avoid the external error codes. */
88    
89  #define MATCH_ACCEPT       (-999)  #define MATCH_ACCEPT       (-999)
90  #define MATCH_COMMIT       (-998)  #define MATCH_KETRPOS      (-998)
91  #define MATCH_PRUNE        (-997)  #define MATCH_ONCE         (-997)
92  #define MATCH_SKIP         (-996)  /* The next 5 must be kept together and in sequence so that a test that checks
93  #define MATCH_SKIP_ARG     (-995)  for any one of them can use a range. */
94  #define MATCH_THEN         (-994)  #define MATCH_COMMIT       (-996)
95    #define MATCH_PRUNE        (-995)
96  /* This is a convenience macro for code that occurs many times. */  #define MATCH_SKIP         (-994)
97    #define MATCH_SKIP_ARG     (-993)
98  #define MRRETURN(ra) \  #define MATCH_THEN         (-992)
99    { \  #define MATCH_BACKTRACK_MAX MATCH_THEN
100    md->mark = markptr; \  #define MATCH_BACKTRACK_MIN MATCH_COMMIT
   RRETURN(ra); \  
   }  
101    
102  /* Maximum number of ints of offset to save on the stack for recursive calls.  /* Maximum number of ints of offset to save on the stack for recursive calls.
103  If the offset vector is bigger, malloc is used. This should be a multiple of 3,  If the offset vector is bigger, malloc is used. This should be a multiple of 3,
# Line 97  because the offset vector is always a mu Line 110  because the offset vector is always a mu
110  static const char rep_min[] = { 0, 0, 1, 1, 0, 0 };  static const char rep_min[] = { 0, 0, 1, 1, 0, 0 };
111  static const char rep_max[] = { 0, 0, 0, 0, 1, 1 };  static const char rep_max[] = { 0, 0, 0, 0, 1, 1 };
112    
   
   
113  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
114  /*************************************************  /*************************************************
115  *        Debugging function to print chars       *  *        Debugging function to print chars       *
# Line 117  Returns:     nothing Line 128  Returns:     nothing
128  */  */
129    
130  static void  static void
131  pchars(const uschar *p, int length, BOOL is_subject, match_data *md)  pchars(const pcre_uchar *p, int length, BOOL is_subject, match_data *md)
132  {  {
133  unsigned int c;  pcre_uint32 c;
134    BOOL utf = md->utf;
135  if (is_subject && length > md->end_subject - p) length = md->end_subject - p;  if (is_subject && length > md->end_subject - p) length = md->end_subject - p;
136  while (length-- > 0)  while (length-- > 0)
137    if (isprint(c = *(p++))) printf("%c", c); else printf("\\x%02x", c);    if (isprint(c = RAWUCHARINCTEST(p))) printf("%c", (char)c); else printf("\\x{%02x}", c);
138  }  }
139  #endif  #endif
140    
# Line 134  while (length-- > 0) Line 146  while (length-- > 0)
146    
147  /* Normally, if a back reference hasn't been set, the length that is passed is  /* Normally, if a back reference hasn't been set, the length that is passed is
148  negative, so the match always fails. However, in JavaScript compatibility mode,  negative, so the match always fails. However, in JavaScript compatibility mode,
149  the length passed is zero. Note that in caseless UTF-8 mode, the number of  the length passed is zero. Note that in caseless UTF-8 mode, the number of
150  subject bytes matched may be different to the number of reference bytes.  subject bytes matched may be different to the number of reference bytes.
151    
152  Arguments:  Arguments:
# Line 142  Arguments: Line 154  Arguments:
154    eptr        pointer into the subject    eptr        pointer into the subject
155    length      length of reference to be matched (number of bytes)    length      length of reference to be matched (number of bytes)
156    md          points to match data block    md          points to match data block
157    ims         the ims flags    caseless    TRUE if caseless
158    
159  Returns:      < 0 if not matched, otherwise the number of subject bytes matched  Returns:      >= 0 the number of subject bytes matched
160                  -1 no match
161                  -2 partial match; always given if at end subject
162  */  */
163    
164  static int  static int
165  match_ref(int offset, register USPTR eptr, int length, match_data *md,  match_ref(int offset, register PCRE_PUCHAR eptr, int length, match_data *md,
166    unsigned long int ims)    BOOL caseless)
167  {  {
168  USPTR eptr_start = eptr;  PCRE_PUCHAR eptr_start = eptr;
169  register USPTR p = md->start_subject + md->offset_vector[offset];  register PCRE_PUCHAR p = md->start_subject + md->offset_vector[offset];
170    #ifdef SUPPORT_UTF
171    BOOL utf = md->utf;
172    #endif
173    
174  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
175  if (eptr >= md->end_subject)  if (eptr >= md->end_subject)
# Line 167  pchars(p, length, FALSE, md); Line 184  pchars(p, length, FALSE, md);
184  printf("\n");  printf("\n");
185  #endif  #endif
186    
187  /* Always fail if reference not set (and not JavaScript compatible). */  /* Always fail if reference not set (and not JavaScript compatible - in that
188    case the length is passed as zero). */
189    
190  if (length < 0) return -1;  if (length < 0) return -1;
191    
# Line 175  if (length < 0) return -1; Line 193  if (length < 0) return -1;
193  properly if Unicode properties are supported. Otherwise, we can check only  properly if Unicode properties are supported. Otherwise, we can check only
194  ASCII characters. */  ASCII characters. */
195    
196  if ((ims & PCRE_CASELESS) != 0)  if (caseless)
197    {    {
198  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
199  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
200    if (md->utf8)    if (utf)
201      {      {
202      /* Match characters up to the end of the reference. NOTE: the number of      /* Match characters up to the end of the reference. NOTE: the number of
203      bytes matched may differ, because there are some characters whose upper and      data units matched may differ, because in UTF-8 there are some characters
204      lower case versions code as different numbers of bytes. For example, U+023A      whose upper and lower case versions code have different numbers of bytes.
205      (2 bytes in UTF-8) is the upper case version of U+2C65 (3 bytes in UTF-8);      For example, U+023A (2 bytes in UTF-8) is the upper case version of U+2C65
206      a sequence of 3 of the former uses 6 bytes, as does a sequence of two of      (3 bytes in UTF-8); a sequence of 3 of the former uses 6 bytes, as does a
207      the latter. It is important, therefore, to check the length along the      sequence of two of the latter. It is important, therefore, to check the
208      reference, not along the subject (earlier code did this wrong). */      length along the reference, not along the subject (earlier code did this
209        wrong). */
210      USPTR endptr = p + length;  
211        PCRE_PUCHAR endptr = p + length;
212      while (p < endptr)      while (p < endptr)
213        {        {
214        int c, d;        pcre_uint32 c, d;
215        if (eptr >= md->end_subject) return -1;        const ucd_record *ur;
216          if (eptr >= md->end_subject) return -2;   /* Partial match */
217        GETCHARINC(c, eptr);        GETCHARINC(c, eptr);
218        GETCHARINC(d, p);        GETCHARINC(d, p);
219        if (c != d && c != UCD_OTHERCASE(d)) return -1;        ur = GET_UCD(d);
220          if (c != d && c != d + ur->other_case)
221            {
222            const pcre_uint32 *pp = PRIV(ucd_caseless_sets) + ur->caseset;
223            for (;;)
224              {
225              if (c < *pp) return -1;
226              if (c == *pp++) break;
227              }
228            }
229        }        }
230      }      }
231    else    else
# Line 206  if ((ims & PCRE_CASELESS) != 0) Line 235  if ((ims & PCRE_CASELESS) != 0)
235    /* The same code works when not in UTF-8 mode and in UTF-8 mode when there    /* The same code works when not in UTF-8 mode and in UTF-8 mode when there
236    is no UCP support. */    is no UCP support. */
237      {      {
     if (eptr + length > md->end_subject) return -1;  
238      while (length-- > 0)      while (length-- > 0)
239        { if (md->lcc[*p++] != md->lcc[*eptr++]) return -1; }        {
240      }        pcre_uint32 cc, cp;
241          if (eptr >= md->end_subject) return -2;   /* Partial match */
242          cc = RAWUCHARTEST(eptr);
243          cp = RAWUCHARTEST(p);
244          if (TABLE_GET(cp, md->lcc, cp) != TABLE_GET(cc, md->lcc, cc)) return -1;
245          p++;
246          eptr++;
247          }
248        }
249    }    }
250    
251  /* In the caseful case, we can just compare the bytes, whether or not we  /* In the caseful case, we can just compare the bytes, whether or not we
252  are in UTF-8 mode. */  are in UTF-8 mode. */
253    
254  else  else
255    {    {
256    if (eptr + length > md->end_subject) return -1;    while (length-- > 0)
257    while (length-- > 0) if (*p++ != *eptr++) return -1;      {
258        if (eptr >= md->end_subject) return -2;   /* Partial match */
259        if (RAWUCHARINCTEST(p) != RAWUCHARINCTEST(eptr)) return -1;
260        }
261    }    }
262    
263  return eptr - eptr_start;  return (int)(eptr - eptr_start);
264  }  }
265    
266    
# Line 273  enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM Line 312  enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM
312         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,
313         RM41,  RM42, RM43, RM44, RM45, RM46, RM47, RM48, RM49, RM50,         RM41,  RM42, RM43, RM44, RM45, RM46, RM47, RM48, RM49, RM50,
314         RM51,  RM52, RM53, RM54, RM55, RM56, RM57, RM58, RM59, RM60,         RM51,  RM52, RM53, RM54, RM55, RM56, RM57, RM58, RM59, RM60,
315         RM61,  RM62 };         RM61,  RM62, RM63, RM64, RM65, RM66, RM67, RM68 };
316    
317  /* These versions of the macros use the stack, as normal. There are debugging  /* These versions of the macros use the stack, as normal. There are debugging
318  versions and production versions. Note that the "rw" argument of RMATCH isn't  versions and production versions. Note that the "rw" argument of RMATCH isn't
# Line 283  actually used in this definition. */ Line 322  actually used in this definition. */
322  #define REGISTER register  #define REGISTER register
323    
324  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
325  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \  #define RMATCH(ra,rb,rc,rd,re,rw) \
326    { \    { \
327    printf("match() called in line %d\n", __LINE__); \    printf("match() called in line %d\n", __LINE__); \
328    rrc = match(ra,rb,mstart,markptr,rc,rd,re,rf,rg,rdepth+1); \    rrc = match(ra,rb,mstart,rc,rd,re,rdepth+1); \
329    printf("to line %d\n", __LINE__); \    printf("to line %d\n", __LINE__); \
330    }    }
331  #define RRETURN(ra) \  #define RRETURN(ra) \
332    { \    { \
333    printf("match() returned %d from line %d ", ra, __LINE__); \    printf("match() returned %d from line %d\n", ra, __LINE__); \
334    return ra; \    return ra; \
335    }    }
336  #else  #else
337  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \  #define RMATCH(ra,rb,rc,rd,re,rw) \
338    rrc = match(ra,rb,mstart,markptr,rc,rd,re,rf,rg,rdepth+1)    rrc = match(ra,rb,mstart,rc,rd,re,rdepth+1)
339  #define RRETURN(ra) return ra  #define RRETURN(ra) return ra
340  #endif  #endif
341    
# Line 309  argument of match(), which never changes Line 348  argument of match(), which never changes
348    
349  #define REGISTER  #define REGISTER
350    
351  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw)\  #define RMATCH(ra,rb,rc,rd,re,rw)\
352    {\    {\
353    heapframe *newframe = (heapframe *)(pcre_stack_malloc)(sizeof(heapframe));\    heapframe *newframe = frame->Xnextframe;\
354    if (newframe == NULL) RRETURN(PCRE_ERROR_NOMEMORY);\    if (newframe == NULL)\
355    frame->Xwhere = rw; \      {\
356        newframe = (heapframe *)(PUBL(stack_malloc))(sizeof(heapframe));\
357        if (newframe == NULL) RRETURN(PCRE_ERROR_NOMEMORY);\
358        newframe->Xnextframe = NULL;\
359        frame->Xnextframe = newframe;\
360        }\
361      frame->Xwhere = rw;\
362    newframe->Xeptr = ra;\    newframe->Xeptr = ra;\
363    newframe->Xecode = rb;\    newframe->Xecode = rb;\
364    newframe->Xmstart = mstart;\    newframe->Xmstart = mstart;\
   newframe->Xmarkptr = markptr;\  
365    newframe->Xoffset_top = rc;\    newframe->Xoffset_top = rc;\
366    newframe->Xims = re;\    newframe->Xeptrb = re;\
   newframe->Xeptrb = rf;\  
   newframe->Xflags = rg;\  
367    newframe->Xrdepth = frame->Xrdepth + 1;\    newframe->Xrdepth = frame->Xrdepth + 1;\
368    newframe->Xprevframe = frame;\    newframe->Xprevframe = frame;\
369    frame = newframe;\    frame = newframe;\
# Line 335  argument of match(), which never changes Line 377  argument of match(), which never changes
377    {\    {\
378    heapframe *oldframe = frame;\    heapframe *oldframe = frame;\
379    frame = oldframe->Xprevframe;\    frame = oldframe->Xprevframe;\
   (pcre_stack_free)(oldframe);\  
380    if (frame != NULL)\    if (frame != NULL)\
381      {\      {\
382      rrc = ra;\      rrc = ra;\
# Line 349  argument of match(), which never changes Line 390  argument of match(), which never changes
390    
391  typedef struct heapframe {  typedef struct heapframe {
392    struct heapframe *Xprevframe;    struct heapframe *Xprevframe;
393      struct heapframe *Xnextframe;
394    
395    /* Function arguments that may change */    /* Function arguments that may change */
396    
397    USPTR Xeptr;    PCRE_PUCHAR Xeptr;
398    const uschar *Xecode;    const pcre_uchar *Xecode;
399    USPTR Xmstart;    PCRE_PUCHAR Xmstart;
   USPTR Xmarkptr;  
400    int Xoffset_top;    int Xoffset_top;
   long int Xims;  
401    eptrblock *Xeptrb;    eptrblock *Xeptrb;
   int Xflags;  
402    unsigned int Xrdepth;    unsigned int Xrdepth;
403    
404    /* Function local variables */    /* Function local variables */
405    
406    USPTR Xcallpat;    PCRE_PUCHAR Xcallpat;
407  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
408    USPTR Xcharptr;    PCRE_PUCHAR Xcharptr;
409  #endif  #endif
410    USPTR Xdata;    PCRE_PUCHAR Xdata;
411    USPTR Xnext;    PCRE_PUCHAR Xnext;
412    USPTR Xpp;    PCRE_PUCHAR Xpp;
413    USPTR Xprev;    PCRE_PUCHAR Xprev;
414    USPTR Xsaved_eptr;    PCRE_PUCHAR Xsaved_eptr;
415    
416    recursion_info Xnew_recursive;    recursion_info Xnew_recursive;
417    
# Line 380  typedef struct heapframe { Line 419  typedef struct heapframe {
419    BOOL Xcondition;    BOOL Xcondition;
420    BOOL Xprev_is_word;    BOOL Xprev_is_word;
421    
   unsigned long int Xoriginal_ims;  
   
422  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
423    int Xprop_type;    int Xprop_type;
424    int Xprop_value;    unsigned int Xprop_value;
425    int Xprop_fail_result;    int Xprop_fail_result;
   int Xprop_category;  
   int Xprop_chartype;  
   int Xprop_script;  
426    int Xoclength;    int Xoclength;
427    uschar Xocchars[8];    pcre_uchar Xocchars[6];
428  #endif  #endif
429    
430    int Xcodelink;    int Xcodelink;
# Line 400  typedef struct heapframe { Line 434  typedef struct heapframe {
434    int Xlength;    int Xlength;
435    int Xmax;    int Xmax;
436    int Xmin;    int Xmin;
437    int Xnumber;    unsigned int Xnumber;
438    int Xoffset;    int Xoffset;
439    int Xop;    unsigned int Xop;
440    int Xsave_capture_last;    pcre_int32 Xsave_capture_last;
441    int Xsave_offset1, Xsave_offset2, Xsave_offset3;    int Xsave_offset1, Xsave_offset2, Xsave_offset3;
442    int Xstacksave[REC_STACK_SAVE_MAX];    int Xstacksave[REC_STACK_SAVE_MAX];
443    
# Line 432  returns a negative (error) response, the Line 466  returns a negative (error) response, the
466  same response. */  same response. */
467    
468  /* These macros pack up tests that are used for partial matching, and which  /* These macros pack up tests that are used for partial matching, and which
469  appears several times in the code. We set the "hit end" flag if the pointer is  appear several times in the code. We set the "hit end" flag if the pointer is
470  at the end of the subject and also past the start of the subject (i.e.  at the end of the subject and also past the start of the subject (i.e.
471  something has been matched). For hard partial matching, we then return  something has been matched). For hard partial matching, we then return
472  immediately. The second one is used when we already know we are past the end of  immediately. The second one is used when we already know we are past the end of
# Line 443  the subject. */ Line 477  the subject. */
477        eptr > md->start_used_ptr) \        eptr > md->start_used_ptr) \
478      { \      { \
479      md->hitend = TRUE; \      md->hitend = TRUE; \
480      if (md->partial > 1) MRRETURN(PCRE_ERROR_PARTIAL); \      if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL); \
481      }      }
482    
483  #define SCHECK_PARTIAL()\  #define SCHECK_PARTIAL()\
484    if (md->partial != 0 && eptr > md->start_used_ptr) \    if (md->partial != 0 && eptr > md->start_used_ptr) \
485      { \      { \
486      md->hitend = TRUE; \      md->hitend = TRUE; \
487      if (md->partial > 1) MRRETURN(PCRE_ERROR_PARTIAL); \      if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL); \
488      }      }
489    
490    
491  /* Performance note: It might be tempting to extract commonly used fields from  /* Performance note: It might be tempting to extract commonly used fields from
492  the md structure (e.g. utf8, end_subject) into individual variables to improve  the md structure (e.g. utf, end_subject) into individual variables to improve
493  performance. Tests using gcc on a SPARC disproved this; in the first case, it  performance. Tests using gcc on a SPARC disproved this; in the first case, it
494  made performance worse.  made performance worse.
495    
# Line 464  Arguments: Line 498  Arguments:
498     ecode       pointer to current position in compiled code     ecode       pointer to current position in compiled code
499     mstart      pointer to the current match start position (can be modified     mstart      pointer to the current match start position (can be modified
500                   by encountering \K)                   by encountering \K)
    markptr     pointer to the most recent MARK name, or NULL  
501     offset_top  current top pointer     offset_top  current top pointer
502     md          pointer to "static" info for the match     md          pointer to "static" info for the match
    ims         current /i, /m, and /s options  
503     eptrb       pointer to chain of blocks containing eptr at start of     eptrb       pointer to chain of blocks containing eptr at start of
504                   brackets - for testing for empty matches                   brackets - for testing for empty matches
    flags       can contain  
                  match_condassert - this is an assertion condition  
                  match_cbegroup - this is the start of an unlimited repeat  
                    group that can match an empty string  
505     rdepth      the recursion depth     rdepth      the recursion depth
506    
507  Returns:       MATCH_MATCH if matched            )  these values are >= 0  Returns:       MATCH_MATCH if matched            )  these values are >= 0
# Line 484  Returns:       MATCH_MATCH if matched Line 512  Returns:       MATCH_MATCH if matched
512  */  */
513    
514  static int  static int
515  match(REGISTER USPTR eptr, REGISTER const uschar *ecode, USPTR mstart,  match(REGISTER PCRE_PUCHAR eptr, REGISTER const pcre_uchar *ecode,
516    const uschar *markptr, int offset_top, match_data *md, unsigned long int ims,    PCRE_PUCHAR mstart, int offset_top, match_data *md, eptrblock *eptrb,
517    eptrblock *eptrb, int flags, unsigned int rdepth)    unsigned int rdepth)
518  {  {
519  /* These variables do not need to be preserved over recursion in this function,  /* These variables do not need to be preserved over recursion in this function,
520  so they can be ordinary variables in all cases. Mark some of them with  so they can be ordinary variables in all cases. Mark some of them with
# Line 494  so they can be ordinary variables in all Line 522  so they can be ordinary variables in all
522    
523  register int  rrc;         /* Returns from recursive calls */  register int  rrc;         /* Returns from recursive calls */
524  register int  i;           /* Used for loops not involving calls to RMATCH() */  register int  i;           /* Used for loops not involving calls to RMATCH() */
525  register unsigned int c;   /* Character values not kept over RMATCH() calls */  register pcre_uint32 c;    /* Character values not kept over RMATCH() calls */
526  register BOOL utf8;        /* Local copy of UTF-8 flag for speed */  register BOOL utf;         /* Local copy of UTF flag for speed */
527    
528  BOOL minimize, possessive; /* Quantifier options */  BOOL minimize, possessive; /* Quantifier options */
529    BOOL caseless;
530  int condcode;  int condcode;
531    
532  /* When recursion is not being used, all "local" variables that have to be  /* When recursion is not being used, all "local" variables that have to be
533  preserved over calls to RMATCH() are part of a "frame" which is obtained from  preserved over calls to RMATCH() are part of a "frame". We set up the top-level
534  heap storage. Set up the top-level frame here; others are obtained from the  frame on the stack here; subsequent instantiations are obtained from the heap
535  heap whenever RMATCH() does a "recursion". See the macro definitions above. */  whenever RMATCH() does a "recursion". See the macro definitions above. Putting
536    the top-level on the stack rather than malloc-ing them all gives a performance
537    boost in many cases where there is not much "recursion". */
538    
539  #ifdef NO_RECURSE  #ifdef NO_RECURSE
540  heapframe *frame = (heapframe *)(pcre_stack_malloc)(sizeof(heapframe));  heapframe *frame = (heapframe *)md->match_frames_base;
 if (frame == NULL) RRETURN(PCRE_ERROR_NOMEMORY);  
 frame->Xprevframe = NULL;            /* Marks the top level */  
541    
542  /* Copy in the original argument variables */  /* Copy in the original argument variables */
543    
544  frame->Xeptr = eptr;  frame->Xeptr = eptr;
545  frame->Xecode = ecode;  frame->Xecode = ecode;
546  frame->Xmstart = mstart;  frame->Xmstart = mstart;
 frame->Xmarkptr = markptr;  
547  frame->Xoffset_top = offset_top;  frame->Xoffset_top = offset_top;
 frame->Xims = ims;  
548  frame->Xeptrb = eptrb;  frame->Xeptrb = eptrb;
 frame->Xflags = flags;  
549  frame->Xrdepth = rdepth;  frame->Xrdepth = rdepth;
550    
551  /* This is where control jumps back to to effect "recursion" */  /* This is where control jumps back to to effect "recursion" */
# Line 531  HEAP_RECURSE: Line 557  HEAP_RECURSE:
557  #define eptr               frame->Xeptr  #define eptr               frame->Xeptr
558  #define ecode              frame->Xecode  #define ecode              frame->Xecode
559  #define mstart             frame->Xmstart  #define mstart             frame->Xmstart
 #define markptr            frame->Xmarkptr  
560  #define offset_top         frame->Xoffset_top  #define offset_top         frame->Xoffset_top
 #define ims                frame->Xims  
561  #define eptrb              frame->Xeptrb  #define eptrb              frame->Xeptrb
 #define flags              frame->Xflags  
562  #define rdepth             frame->Xrdepth  #define rdepth             frame->Xrdepth
563    
564  /* Ditto for the local variables */  /* Ditto for the local variables */
565    
566  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
567  #define charptr            frame->Xcharptr  #define charptr            frame->Xcharptr
568  #endif  #endif
569  #define callpat            frame->Xcallpat  #define callpat            frame->Xcallpat
# Line 557  HEAP_RECURSE: Line 580  HEAP_RECURSE:
580  #define condition          frame->Xcondition  #define condition          frame->Xcondition
581  #define prev_is_word       frame->Xprev_is_word  #define prev_is_word       frame->Xprev_is_word
582    
 #define original_ims       frame->Xoriginal_ims  
   
583  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
584  #define prop_type          frame->Xprop_type  #define prop_type          frame->Xprop_type
585  #define prop_value         frame->Xprop_value  #define prop_value         frame->Xprop_value
586  #define prop_fail_result   frame->Xprop_fail_result  #define prop_fail_result   frame->Xprop_fail_result
 #define prop_category      frame->Xprop_category  
 #define prop_chartype      frame->Xprop_chartype  
 #define prop_script        frame->Xprop_script  
587  #define oclength           frame->Xoclength  #define oclength           frame->Xoclength
588  #define occhars            frame->Xocchars  #define occhars            frame->Xocchars
589  #endif  #endif
# Line 595  i, and fc and c, can be the same variabl Line 613  i, and fc and c, can be the same variabl
613  #define fi i  #define fi i
614  #define fc c  #define fc c
615    
616    /* Many of the following variables are used only in small blocks of the code.
617    My normal style of coding would have declared them within each of those blocks.
618    However, in order to accommodate the version of this code that uses an external
619    "stack" implemented on the heap, it is easier to declare them all here, so the
620    declarations can be cut out in a block. The only declarations within blocks
621    below are for variables that do not have to be preserved over a recursive call
622    to RMATCH(). */
623    
624    #ifdef SUPPORT_UTF
625    const pcre_uchar *charptr;
626    #endif
627    const pcre_uchar *callpat;
628    const pcre_uchar *data;
629    const pcre_uchar *next;
630    PCRE_PUCHAR       pp;
631    const pcre_uchar *prev;
632    PCRE_PUCHAR       saved_eptr;
633    
634    recursion_info new_recursive;
635    
636  #ifdef SUPPORT_UTF8                /* Many of these variables are used only  */  BOOL cur_is_word;
 const uschar *charptr;             /* in small blocks of the code. My normal */  
 #endif                             /* style of coding would have declared    */  
 const uschar *callpat;             /* them within each of those blocks.      */  
 const uschar *data;                /* However, in order to accommodate the   */  
 const uschar *next;                /* version of this code that uses an      */  
 USPTR         pp;                  /* external "stack" implemented on the    */  
 const uschar *prev;                /* heap, it is easier to declare them all */  
 USPTR         saved_eptr;          /* here, so the declarations can be cut   */  
                                    /* out in a block. The only declarations  */  
 recursion_info new_recursive;      /* within blocks below are for variables  */  
                                    /* that do not have to be preserved over  */  
 BOOL cur_is_word;                  /* a recursive call to RMATCH().          */  
637  BOOL condition;  BOOL condition;
638  BOOL prev_is_word;  BOOL prev_is_word;
639    
 unsigned long int original_ims;  
   
640  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
641  int prop_type;  int prop_type;
642  int prop_value;  unsigned int prop_value;
643  int prop_fail_result;  int prop_fail_result;
 int prop_category;  
 int prop_chartype;  
 int prop_script;  
644  int oclength;  int oclength;
645  uschar occhars[8];  pcre_uchar occhars[6];
646  #endif  #endif
647    
648  int codelink;  int codelink;
# Line 630  int ctype; Line 650  int ctype;
650  int length;  int length;
651  int max;  int max;
652  int min;  int min;
653  int number;  unsigned int number;
654  int offset;  int offset;
655  int op;  unsigned int op;
656  int save_capture_last;  pcre_int32 save_capture_last;
657  int save_offset1, save_offset2, save_offset3;  int save_offset1, save_offset2, save_offset3;
658  int stacksave[REC_STACK_SAVE_MAX];  int stacksave[REC_STACK_SAVE_MAX];
659    
660  eptrblock newptrb;  eptrblock newptrb;
661    
662    /* There is a special fudge for calling match() in a way that causes it to
663    measure the size of its basic stack frame when the stack is being used for
664    recursion. The second argument (ecode) being NULL triggers this behaviour. It
665    cannot normally ever be NULL. The return is the negated value of the frame
666    size. */
667    
668    if (ecode == NULL)
669      {
670      if (rdepth == 0)
671        return match((PCRE_PUCHAR)&rdepth, NULL, NULL, 0, NULL, NULL, 1);
672      else
673        {
674        int len = (char *)&rdepth - (char *)eptr;
675        return (len > 0)? -len : len;
676        }
677      }
678  #endif     /* NO_RECURSE */  #endif     /* NO_RECURSE */
679    
680    /* To save space on the stack and in the heap frame, I have doubled up on some
681    of the local variables that are used only in localised parts of the code, but
682    still need to be preserved over recursive calls of match(). These macros define
683    the alternative names that are used. */
684    
685    #define allow_zero    cur_is_word
686    #define cbegroup      condition
687    #define code_offset   codelink
688    #define condassert    condition
689    #define matched_once  prev_is_word
690    #define foc           number
691    #define save_mark     data
692    
693  /* These statements are here to stop the compiler complaining about unitialized  /* These statements are here to stop the compiler complaining about unitialized
694  variables. */  variables. */
695    
# Line 664  defined). However, RMATCH isn't like a f Line 714  defined). However, RMATCH isn't like a f
714  complicated macro. It has to be used in one particular way. This shouldn't,  complicated macro. It has to be used in one particular way. This shouldn't,
715  however, impact performance when true recursion is being used. */  however, impact performance when true recursion is being used. */
716    
717  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
718  utf8 = md->utf8;       /* Local copy of the flag */  utf = md->utf;       /* Local copy of the flag */
719  #else  #else
720  utf8 = FALSE;  utf = FALSE;
721  #endif  #endif
722    
723  /* First check that we haven't called match() too many times, or that we  /* First check that we haven't called match() too many times, or that we
# Line 676  haven't exceeded the recursive call limi Line 726  haven't exceeded the recursive call limi
726  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);
727  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);
728    
 original_ims = ims;    /* Save for resetting on ')' */  
   
729  /* At the start of a group with an unlimited repeat that may match an empty  /* At the start of a group with an unlimited repeat that may match an empty
730  string, the match_cbegroup flag is set. When this is the case, add the current  string, the variable md->match_function_type is set to MATCH_CBEGROUP. It is
731  subject pointer to the chain of such remembered pointers, to be checked when we  done this way to save having to use another function argument, which would take
732  hit the closing ket, in order to break infinite loops that match no characters.  up space on the stack. See also MATCH_CONDASSERT below.
733  When match() is called in other circumstances, don't add to the chain. The  
734  match_cbegroup flag must NOT be used with tail recursion, because the memory  When MATCH_CBEGROUP is set, add the current subject pointer to the chain of
735  block that is used is on the stack, so a new one may be required for each  such remembered pointers, to be checked when we hit the closing ket, in order
736  match(). */  to break infinite loops that match no characters. When match() is called in
737    other circumstances, don't add to the chain. The MATCH_CBEGROUP feature must
738    NOT be used with tail recursion, because the memory block that is used is on
739    the stack, so a new one may be required for each match(). */
740    
741  if ((flags & match_cbegroup) != 0)  if (md->match_function_type == MATCH_CBEGROUP)
742    {    {
743    newptrb.epb_saved_eptr = eptr;    newptrb.epb_saved_eptr = eptr;
744    newptrb.epb_prev = eptrb;    newptrb.epb_prev = eptrb;
745    eptrb = &newptrb;    eptrb = &newptrb;
746      md->match_function_type = 0;
747    }    }
748    
749  /* Now start processing the opcodes. */  /* Now start processing the opcodes. */
# Line 704  for (;;) Line 756  for (;;)
756    switch(op)    switch(op)
757      {      {
758      case OP_MARK:      case OP_MARK:
759      markptr = ecode + 2;      md->nomatch_mark = ecode + 2;
760      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,      md->mark = NULL;    /* In case previously set by assertion */
761        ims, eptrb, flags, RM55);      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
762          eptrb, RM55);
763        if ((rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) &&
764             md->mark == NULL) md->mark = ecode + 2;
765    
766      /* A return of MATCH_SKIP_ARG means that matching failed at SKIP with an      /* A return of MATCH_SKIP_ARG means that matching failed at SKIP with an
767      argument, and we must check whether that argument matches this MARK's      argument, and we must check whether that argument matches this MARK's
# Line 715  for (;;) Line 770  for (;;)
770      position and return MATCH_SKIP. Otherwise, pass back the return code      position and return MATCH_SKIP. Otherwise, pass back the return code
771      unaltered. */      unaltered. */
772    
773      if (rrc == MATCH_SKIP_ARG &&      else if (rrc == MATCH_SKIP_ARG &&
774          strcmp((char *)markptr, (char *)(md->start_match_ptr)) == 0)          STRCMP_UC_UC_TEST(ecode + 2, md->start_match_ptr) == 0)
775        {        {
776        md->start_match_ptr = eptr;        md->start_match_ptr = eptr;
777        RRETURN(MATCH_SKIP);        RRETURN(MATCH_SKIP);
778        }        }
   
     if (md->mark == NULL) md->mark = markptr;  
779      RRETURN(rrc);      RRETURN(rrc);
780    
781      case OP_FAIL:      case OP_FAIL:
782      MRRETURN(MATCH_NOMATCH);      RRETURN(MATCH_NOMATCH);
   
     /* COMMIT overrides PRUNE, SKIP, and THEN */  
783    
784      case OP_COMMIT:      case OP_COMMIT:
785      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
786        ims, eptrb, flags, RM52);        eptrb, RM52);
787      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE &&      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
788          rrc != MATCH_SKIP && rrc != MATCH_SKIP_ARG &&      RRETURN(MATCH_COMMIT);
         rrc != MATCH_THEN)  
       RRETURN(rrc);  
     MRRETURN(MATCH_COMMIT);  
   
     /* PRUNE overrides THEN */  
789    
790      case OP_PRUNE:      case OP_PRUNE:
791      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
792        ims, eptrb, flags, RM51);        eptrb, RM51);
793      if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
794      MRRETURN(MATCH_PRUNE);      RRETURN(MATCH_PRUNE);
795    
796      case OP_PRUNE_ARG:      case OP_PRUNE_ARG:
797      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,      md->nomatch_mark = ecode + 2;
798        ims, eptrb, flags, RM56);      md->mark = NULL;    /* In case previously set by assertion */
799      if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
800      md->mark = ecode + 2;        eptrb, RM56);
801        if ((rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) &&
802             md->mark == NULL) md->mark = ecode + 2;
803        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
804      RRETURN(MATCH_PRUNE);      RRETURN(MATCH_PRUNE);
805    
     /* SKIP overrides PRUNE and THEN */  
   
806      case OP_SKIP:      case OP_SKIP:
807      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
808        ims, eptrb, flags, RM53);        eptrb, RM53);
809      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
       RRETURN(rrc);  
810      md->start_match_ptr = eptr;   /* Pass back current position */      md->start_match_ptr = eptr;   /* Pass back current position */
811      MRRETURN(MATCH_SKIP);      RRETURN(MATCH_SKIP);
812    
813        /* Note that, for Perl compatibility, SKIP with an argument does NOT set
814        nomatch_mark. When a pattern match ends with a SKIP_ARG for which there was
815        not a matching mark, we have to re-run the match, ignoring the SKIP_ARG
816        that failed and any that preceed it (either they also failed, or were not
817        triggered). To do this, we maintain a count of executed SKIP_ARGs. If a
818        SKIP_ARG gets to top level, the match is re-run with md->ignore_skip_arg
819        set to the count of the one that failed. */
820    
821      case OP_SKIP_ARG:      case OP_SKIP_ARG:
822      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1], offset_top, md,      md->skip_arg_count++;
823        ims, eptrb, flags, RM57);      if (md->skip_arg_count <= md->ignore_skip_arg)
824      if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)        {
825        RRETURN(rrc);        ecode += PRIV(OP_lengths)[*ecode] + ecode[1];
826          break;
827          }
828        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
829          eptrb, RM57);
830        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
831    
832      /* Pass back the current skip name by overloading md->start_match_ptr and      /* Pass back the current skip name by overloading md->start_match_ptr and
833      returning the special MATCH_SKIP_ARG return code. This will either be      returning the special MATCH_SKIP_ARG return code. This will either be
834      caught by a matching MARK, or get to the top, where it is treated the same      caught by a matching MARK, or get to the top, where it causes a rematch
835      as PRUNE. */      with md->ignore_skip_arg set to the value of md->skip_arg_count. */
836    
837      md->start_match_ptr = ecode + 2;      md->start_match_ptr = ecode + 2;
838      RRETURN(MATCH_SKIP_ARG);      RRETURN(MATCH_SKIP_ARG);
839    
840      /* For THEN (and THEN_ARG) we pass back the address of the bracket or      /* For THEN (and THEN_ARG) we pass back the address of the opcode, so that
841      the alt that is at the start of the current branch. This makes it possible      the branch in which it occurs can be determined. Overload the start of
842      to skip back past alternatives that precede the THEN within the current      match pointer to do this. */
     branch. */  
843    
844      case OP_THEN:      case OP_THEN:
845      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
846        ims, eptrb, flags, RM54);        eptrb, RM54);
847      if (rrc != MATCH_NOMATCH) RRETURN(rrc);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
848      md->start_match_ptr = ecode - GET(ecode, 1);      md->start_match_ptr = ecode;
849      MRRETURN(MATCH_THEN);      RRETURN(MATCH_THEN);
850    
851      case OP_THEN_ARG:      case OP_THEN_ARG:
852      RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode] + ecode[1+LINK_SIZE],      md->nomatch_mark = ecode + 2;
853        offset_top, md, ims, eptrb, flags, RM58);      md->mark = NULL;    /* In case previously set by assertion */
854        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top,
855          md, eptrb, RM58);
856        if ((rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) &&
857             md->mark == NULL) md->mark = ecode + 2;
858      if (rrc != MATCH_NOMATCH) RRETURN(rrc);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
859      md->start_match_ptr = ecode - GET(ecode, 1);      md->start_match_ptr = ecode;
     md->mark = ecode + LINK_SIZE + 2;  
860      RRETURN(MATCH_THEN);      RRETURN(MATCH_THEN);
861    
862      /* Handle a capturing bracket. If there is space in the offset vector, save      /* Handle an atomic group that does not contain any capturing parentheses.
863      the current subject position in the working slot at the top of the vector.      This can be handled like an assertion. Prior to 8.13, all atomic groups
864      We mustn't change the current values of the data slot, because they may be      were handled this way. In 8.13, the code was changed as below for ONCE, so
865      set from a previous iteration of this group, and be referred to by a      that backups pass through the group and thereby reset captured values.
866      reference inside the group.      However, this uses a lot more stack, so in 8.20, atomic groups that do not
867        contain any captures generate OP_ONCE_NC, which can be handled in the old,
868      If the bracket fails to match, we need to restore this value and also the      less stack intensive way.
869      values of the final offsets, in case they were set by a previous iteration  
870      of the same bracket.      Check the alternative branches in turn - the matching won't pass the KET
871        for this kind of subpattern. If any one branch matches, we carry on as at
872        the end of a normal bracket, leaving the subject pointer, but resetting
873        the start-of-match value in case it was changed by \K. */
874    
875        case OP_ONCE_NC:
876        prev = ecode;
877        saved_eptr = eptr;
878        save_mark = md->mark;
879        do
880          {
881          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM64);
882          if (rrc == MATCH_MATCH)  /* Note: _not_ MATCH_ACCEPT */
883            {
884            mstart = md->start_match_ptr;
885            break;
886            }
887          if (rrc == MATCH_THEN)
888            {
889            next = ecode + GET(ecode,1);
890            if (md->start_match_ptr < next &&
891                (*ecode == OP_ALT || *next == OP_ALT))
892              rrc = MATCH_NOMATCH;
893            }
894    
895          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
896          ecode += GET(ecode,1);
897          md->mark = save_mark;
898          }
899        while (*ecode == OP_ALT);
900    
901        /* If hit the end of the group (which could be repeated), fail */
902    
903        if (*ecode != OP_ONCE_NC && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);
904    
905        /* Continue as from after the group, updating the offsets high water
906        mark, since extracts may have been taken. */
907    
908        do ecode += GET(ecode, 1); while (*ecode == OP_ALT);
909    
910        offset_top = md->end_offset_top;
911        eptr = md->end_match_ptr;
912    
913        /* For a non-repeating ket, just continue at this level. This also
914        happens for a repeating ket if no characters were matched in the group.
915        This is the forcible breaking of infinite loops as implemented in Perl
916        5.005. */
917    
918        if (*ecode == OP_KET || eptr == saved_eptr)
919          {
920          ecode += 1+LINK_SIZE;
921          break;
922          }
923    
924        /* The repeating kets try the rest of the pattern or restart from the
925        preceding bracket, in the appropriate order. The second "call" of match()
926        uses tail recursion, to avoid using another stack frame. */
927    
928        if (*ecode == OP_KETRMIN)
929          {
930          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM65);
931          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
932          ecode = prev;
933          goto TAIL_RECURSE;
934          }
935        else  /* OP_KETRMAX */
936          {
937          RMATCH(eptr, prev, offset_top, md, eptrb, RM66);
938          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
939          ecode += 1 + LINK_SIZE;
940          goto TAIL_RECURSE;
941          }
942        /* Control never gets here */
943    
944        /* Handle a capturing bracket, other than those that are possessive with an
945        unlimited repeat. If there is space in the offset vector, save the current
946        subject position in the working slot at the top of the vector. We mustn't
947        change the current values of the data slot, because they may be set from a
948        previous iteration of this group, and be referred to by a reference inside
949        the group. A failure to match might occur after the group has succeeded,
950        if something later on doesn't match. For this reason, we need to restore
951        the working value and also the values of the final offsets, in case they
952        were set by a previous iteration of the same bracket.
953    
954      If there isn't enough space in the offset vector, treat this as if it were      If there isn't enough space in the offset vector, treat this as if it were
955      a non-capturing bracket. Don't worry about setting the flag for the error      a non-capturing bracket. Don't worry about setting the flag for the error
# Line 830  for (;;) Line 973  for (;;)
973        save_offset2 = md->offset_vector[offset+1];        save_offset2 = md->offset_vector[offset+1];
974        save_offset3 = md->offset_vector[md->offset_end - number];        save_offset3 = md->offset_vector[md->offset_end - number];
975        save_capture_last = md->capture_last;        save_capture_last = md->capture_last;
976          save_mark = md->mark;
977    
978        DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));        DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
979        md->offset_vector[md->offset_end - number] =        md->offset_vector[md->offset_end - number] =
980          (int)(eptr - md->start_subject);          (int)(eptr - md->start_subject);
981    
982        flags = (op == OP_SCBRA)? match_cbegroup : 0;        for (;;)
       do  
983          {          {
984          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,          if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
985            ims, eptrb, flags, RM1);          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
986          if (rrc != MATCH_NOMATCH &&            eptrb, RM1);
987              (rrc != MATCH_THEN || md->start_match_ptr != ecode))          if (rrc == MATCH_ONCE) break;  /* Backing up through an atomic group */
988            RRETURN(rrc);  
989            /* If we backed up to a THEN, check whether it is within the current
990            branch by comparing the address of the THEN that is passed back with
991            the end of the branch. If it is within the current branch, and the
992            branch is one of two or more alternatives (it either starts or ends
993            with OP_ALT), we have reached the limit of THEN's action, so convert
994            the return code to NOMATCH, which will cause normal backtracking to
995            happen from now on. Otherwise, THEN is passed back to an outer
996            alternative. This implements Perl's treatment of parenthesized groups,
997            where a group not containing | does not affect the current alternative,
998            that is, (X) is NOT the same as (X|(*F)). */
999    
1000            if (rrc == MATCH_THEN)
1001              {
1002              next = ecode + GET(ecode,1);
1003              if (md->start_match_ptr < next &&
1004                  (*ecode == OP_ALT || *next == OP_ALT))
1005                rrc = MATCH_NOMATCH;
1006              }
1007    
1008            /* Anything other than NOMATCH is passed back. */
1009    
1010            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1011          md->capture_last = save_capture_last;          md->capture_last = save_capture_last;
1012          ecode += GET(ecode, 1);          ecode += GET(ecode, 1);
1013            md->mark = save_mark;
1014            if (*ecode != OP_ALT) break;
1015          }          }
       while (*ecode == OP_ALT);  
1016    
1017        DPRINTF(("bracket %d failed\n", number));        DPRINTF(("bracket %d failed\n", number));
   
1018        md->offset_vector[offset] = save_offset1;        md->offset_vector[offset] = save_offset1;
1019        md->offset_vector[offset+1] = save_offset2;        md->offset_vector[offset+1] = save_offset2;
1020        md->offset_vector[md->offset_end - number] = save_offset3;        md->offset_vector[md->offset_end - number] = save_offset3;
1021    
1022        if (rrc != MATCH_THEN) md->mark = markptr;        /* At this point, rrc will be one of MATCH_ONCE or MATCH_NOMATCH. */
1023        RRETURN(MATCH_NOMATCH);  
1024          RRETURN(rrc);
1025        }        }
1026    
1027      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
# Line 869  for (;;) Line 1035  for (;;)
1035      /* VVVVVVVVVVVVVVVVVVVVVVVVV */      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1036      /* VVVVVVVVVVVVVVVVVVVVVVVVV */      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1037    
1038      /* Non-capturing bracket. Loop for all the alternatives. When we get to the      /* Non-capturing or atomic group, except for possessive with unlimited
1039      final alternative within the brackets, we would return the result of a      repeat and ONCE group with no captures. Loop for all the alternatives.
     recursive call to match() whatever happened. We can reduce stack usage by  
     turning this into a tail recursion, except in the case when match_cbegroup  
     is set.*/  
1040    
1041        When we get to the final alternative within the brackets, we used to return
1042        the result of a recursive call to match() whatever happened so it was
1043        possible to reduce stack usage by turning this into a tail recursion,
1044        except in the case of a possibly empty group. However, now that there is
1045        the possiblity of (*THEN) occurring in the final alternative, this
1046        optimization is no longer always possible.
1047    
1048        We can optimize if we know there are no (*THEN)s in the pattern; at present
1049        this is the best that can be done.
1050    
1051        MATCH_ONCE is returned when the end of an atomic group is successfully
1052        reached, but subsequent matching fails. It passes back up the tree (causing
1053        captured values to be reset) until the original atomic group level is
1054        reached. This is tested by comparing md->once_target with the start of the
1055        group. At this point, the return is converted into MATCH_NOMATCH so that
1056        previous backup points can be taken. */
1057    
1058        case OP_ONCE:
1059      case OP_BRA:      case OP_BRA:
1060      case OP_SBRA:      case OP_SBRA:
1061      DPRINTF(("start non-capturing bracket\n"));      DPRINTF(("start non-capturing bracket\n"));
1062      flags = (op >= OP_SBRA)? match_cbegroup : 0;  
1063      for (;;)      for (;;)
1064        {        {
1065        if (ecode[GET(ecode, 1)] != OP_ALT)   /* Final alternative */        if (op >= OP_SBRA || op == OP_ONCE)
1066            md->match_function_type = MATCH_CBEGROUP;
1067    
1068          /* If this is not a possibly empty group, and there are no (*THEN)s in
1069          the pattern, and this is the final alternative, optimize as described
1070          above. */
1071    
1072          else if (!md->hasthen && ecode[GET(ecode, 1)] != OP_ALT)
1073            {
1074            ecode += PRIV(OP_lengths)[*ecode];
1075            goto TAIL_RECURSE;
1076            }
1077    
1078          /* In all other cases, we have to make another call to match(). */
1079    
1080          save_mark = md->mark;
1081          save_capture_last = md->capture_last;
1082          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md, eptrb,
1083            RM2);
1084    
1085          /* See comment in the code for capturing groups above about handling
1086          THEN. */
1087    
1088          if (rrc == MATCH_THEN)
1089            {
1090            next = ecode + GET(ecode,1);
1091            if (md->start_match_ptr < next &&
1092                (*ecode == OP_ALT || *next == OP_ALT))
1093              rrc = MATCH_NOMATCH;
1094            }
1095    
1096          if (rrc != MATCH_NOMATCH)
1097          {          {
1098          if (flags == 0)    /* Not a possibly empty group */          if (rrc == MATCH_ONCE)
1099            {            {
1100            ecode += _pcre_OP_lengths[*ecode];            const pcre_uchar *scode = ecode;
1101            DPRINTF(("bracket 0 tail recursion\n"));            if (*scode != OP_ONCE)           /* If not at start, find it */
1102            goto TAIL_RECURSE;              {
1103                while (*scode == OP_ALT) scode += GET(scode, 1);
1104                scode -= GET(scode, 1);
1105                }
1106              if (md->once_target == scode) rrc = MATCH_NOMATCH;
1107            }            }
1108            RRETURN(rrc);
1109            }
1110          ecode += GET(ecode, 1);
1111          md->mark = save_mark;
1112          if (*ecode != OP_ALT) break;
1113          md->capture_last = save_capture_last;
1114          }
1115    
1116        RRETURN(MATCH_NOMATCH);
1117    
1118        /* Handle possessive capturing brackets with an unlimited repeat. We come
1119        here from BRAZERO with allow_zero set TRUE. The offset_vector values are
1120        handled similarly to the normal case above. However, the matching is
1121        different. The end of these brackets will always be OP_KETRPOS, which
1122        returns MATCH_KETRPOS without going further in the pattern. By this means
1123        we can handle the group by iteration rather than recursion, thereby
1124        reducing the amount of stack needed. */
1125    
1126        case OP_CBRAPOS:
1127        case OP_SCBRAPOS:
1128        allow_zero = FALSE;
1129    
1130          /* Possibly empty group; can't use tail recursion. */      POSSESSIVE_CAPTURE:
1131        number = GET2(ecode, 1+LINK_SIZE);
1132        offset = number << 1;
1133    
1134          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,  #ifdef PCRE_DEBUG
1135            eptrb, flags, RM48);      printf("start possessive bracket %d\n", number);
1136          if (rrc == MATCH_NOMATCH) md->mark = markptr;      printf("subject=");
1137          RRETURN(rrc);      pchars(eptr, 16, TRUE, md);
1138        printf("\n");
1139    #endif
1140    
1141        if (offset < md->offset_max)
1142          {
1143          matched_once = FALSE;
1144          code_offset = (int)(ecode - md->start_code);
1145    
1146          save_offset1 = md->offset_vector[offset];
1147          save_offset2 = md->offset_vector[offset+1];
1148          save_offset3 = md->offset_vector[md->offset_end - number];
1149          save_capture_last = md->capture_last;
1150    
1151          DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
1152    
1153          /* Each time round the loop, save the current subject position for use
1154          when the group matches. For MATCH_MATCH, the group has matched, so we
1155          restart it with a new subject starting position, remembering that we had
1156          at least one match. For MATCH_NOMATCH, carry on with the alternatives, as
1157          usual. If we haven't matched any alternatives in any iteration, check to
1158          see if a previous iteration matched. If so, the group has matched;
1159          continue from afterwards. Otherwise it has failed; restore the previous
1160          capture values before returning NOMATCH. */
1161    
1162          for (;;)
1163            {
1164            md->offset_vector[md->offset_end - number] =
1165              (int)(eptr - md->start_subject);
1166            if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
1167            RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
1168              eptrb, RM63);
1169            if (rrc == MATCH_KETRPOS)
1170              {
1171              offset_top = md->end_offset_top;
1172              eptr = md->end_match_ptr;
1173              ecode = md->start_code + code_offset;
1174              save_capture_last = md->capture_last;
1175              matched_once = TRUE;
1176              continue;
1177              }
1178    
1179            /* See comment in the code for capturing groups above about handling
1180            THEN. */
1181    
1182            if (rrc == MATCH_THEN)
1183              {
1184              next = ecode + GET(ecode,1);
1185              if (md->start_match_ptr < next &&
1186                  (*ecode == OP_ALT || *next == OP_ALT))
1187                rrc = MATCH_NOMATCH;
1188              }
1189    
1190            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1191            md->capture_last = save_capture_last;
1192            ecode += GET(ecode, 1);
1193            if (*ecode != OP_ALT) break;
1194            }
1195    
1196          if (!matched_once)
1197            {
1198            md->offset_vector[offset] = save_offset1;
1199            md->offset_vector[offset+1] = save_offset2;
1200            md->offset_vector[md->offset_end - number] = save_offset3;
1201          }          }
1202    
1203        /* For non-final alternatives, continue the loop for a NOMATCH result;        if (allow_zero || matched_once)
1204        otherwise return. */          {
1205            ecode += 1 + LINK_SIZE;
1206            break;
1207            }
1208    
1209        RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,        RRETURN(MATCH_NOMATCH);
1210          eptrb, flags, RM2);        }
1211        if (rrc != MATCH_NOMATCH &&  
1212            (rrc != MATCH_THEN || md->start_match_ptr != ecode))      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
1213          RRETURN(rrc);      as a non-capturing bracket. */
1214    
1215        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1216        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1217    
1218        DPRINTF(("insufficient capture room: treat as non-capturing\n"));
1219    
1220        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1221        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1222    
1223        /* Non-capturing possessive bracket with unlimited repeat. We come here
1224        from BRAZERO with allow_zero = TRUE. The code is similar to the above,
1225        without the capturing complication. It is written out separately for speed
1226        and cleanliness. */
1227    
1228        case OP_BRAPOS:
1229        case OP_SBRAPOS:
1230        allow_zero = FALSE;
1231    
1232        POSSESSIVE_NON_CAPTURE:
1233        matched_once = FALSE;
1234        code_offset = (int)(ecode - md->start_code);
1235        save_capture_last = md->capture_last;
1236    
1237        for (;;)
1238          {
1239          if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
1240          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
1241            eptrb, RM48);
1242          if (rrc == MATCH_KETRPOS)
1243            {
1244            offset_top = md->end_offset_top;
1245            eptr = md->end_match_ptr;
1246            ecode = md->start_code + code_offset;
1247            matched_once = TRUE;
1248            continue;
1249            }
1250    
1251          /* See comment in the code for capturing groups above about handling
1252          THEN. */
1253    
1254          if (rrc == MATCH_THEN)
1255            {
1256            next = ecode + GET(ecode,1);
1257            if (md->start_match_ptr < next &&
1258                (*ecode == OP_ALT || *next == OP_ALT))
1259              rrc = MATCH_NOMATCH;
1260            }
1261    
1262          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1263        ecode += GET(ecode, 1);        ecode += GET(ecode, 1);
1264          if (*ecode != OP_ALT) break;
1265          md->capture_last = save_capture_last;
1266          }
1267    
1268        if (matched_once || allow_zero)
1269          {
1270          ecode += 1 + LINK_SIZE;
1271          break;
1272        }        }
1273        RRETURN(MATCH_NOMATCH);
1274    
1275      /* Control never reaches here. */      /* Control never reaches here. */
1276    
1277      /* Conditional group: compilation checked that there are no more than      /* Conditional group: compilation checked that there are no more than
1278      two branches. If the condition is false, skipping the first branch takes us      two branches. If the condition is false, skipping the first branch takes us
1279      past the end if there is only one branch, but that's OK because that is      past the end if there is only one branch, but that's OK because that is
1280      exactly what going to the ket would do. As there is only one branch to be      exactly what going to the ket would do. */
     obeyed, we can use tail recursion to avoid using another stack frame. */  
1281    
1282      case OP_COND:      case OP_COND:
1283      case OP_SCOND:      case OP_SCOND:
1284      codelink= GET(ecode, 1);      codelink = GET(ecode, 1);
1285    
1286      /* Because of the way auto-callout works during compile, a callout item is      /* Because of the way auto-callout works during compile, a callout item is
1287      inserted between OP_COND and an assertion condition. */      inserted between OP_COND and an assertion condition. */
1288    
1289      if (ecode[LINK_SIZE+1] == OP_CALLOUT)      if (ecode[LINK_SIZE+1] == OP_CALLOUT)
1290        {        {
1291        if (pcre_callout != NULL)        if (PUBL(callout) != NULL)
1292          {          {
1293          pcre_callout_block cb;          PUBL(callout_block) cb;
1294          cb.version          = 1;   /* Version 1 of the callout block */          cb.version          = 2;   /* Version 1 of the callout block */
1295          cb.callout_number   = ecode[LINK_SIZE+2];          cb.callout_number   = ecode[LINK_SIZE+2];
1296          cb.offset_vector    = md->offset_vector;          cb.offset_vector    = md->offset_vector;
1297    #if defined COMPILE_PCRE8
1298          cb.subject          = (PCRE_SPTR)md->start_subject;          cb.subject          = (PCRE_SPTR)md->start_subject;
1299    #elif defined COMPILE_PCRE16
1300            cb.subject          = (PCRE_SPTR16)md->start_subject;
1301    #elif defined COMPILE_PCRE32
1302            cb.subject          = (PCRE_SPTR32)md->start_subject;
1303    #endif
1304          cb.subject_length   = (int)(md->end_subject - md->start_subject);          cb.subject_length   = (int)(md->end_subject - md->start_subject);
1305          cb.start_match      = (int)(mstart - md->start_subject);          cb.start_match      = (int)(mstart - md->start_subject);
1306          cb.current_position = (int)(eptr - md->start_subject);          cb.current_position = (int)(eptr - md->start_subject);
1307          cb.pattern_position = GET(ecode, LINK_SIZE + 3);          cb.pattern_position = GET(ecode, LINK_SIZE + 3);
1308          cb.next_item_length = GET(ecode, 3 + 2*LINK_SIZE);          cb.next_item_length = GET(ecode, 3 + 2*LINK_SIZE);
1309          cb.capture_top      = offset_top/2;          cb.capture_top      = offset_top/2;
1310          cb.capture_last     = md->capture_last;          cb.capture_last     = md->capture_last & CAPLMASK;
1311            /* Internal change requires this for API compatibility. */
1312            if (cb.capture_last == 0) cb.capture_last = -1;
1313          cb.callout_data     = md->callout_data;          cb.callout_data     = md->callout_data;
1314          if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);          cb.mark             = md->nomatch_mark;
1315            if ((rrc = (*PUBL(callout))(&cb)) > 0) RRETURN(MATCH_NOMATCH);
1316          if (rrc < 0) RRETURN(rrc);          if (rrc < 0) RRETURN(rrc);
1317          }          }
1318        ecode += _pcre_OP_lengths[OP_CALLOUT];        ecode += PRIV(OP_lengths)[OP_CALLOUT];
1319          codelink -= PRIV(OP_lengths)[OP_CALLOUT];
1320        }        }
1321    
1322      condcode = ecode[LINK_SIZE+1];      condcode = ecode[LINK_SIZE+1];
# Line 959  for (;;) Line 1332  for (;;)
1332          }          }
1333        else        else
1334          {          {
1335          int recno = GET2(ecode, LINK_SIZE + 2);   /* Recursion group number*/          unsigned int recno = GET2(ecode, LINK_SIZE + 2);   /* Recursion group number*/
1336          condition =  (recno == RREF_ANY || recno == md->recursive->group_num);          condition = (recno == RREF_ANY || recno == md->recursive->group_num);
1337    
1338          /* If the test is for recursion into a specific subpattern, and it is          /* If the test is for recursion into a specific subpattern, and it is
1339          false, but the test was set up by name, scan the table to see if the          false, but the test was set up by name, scan the table to see if the
1340          name refers to any other numbers, and test them. The condition is true          name refers to any other numbers, and test them. The condition is true
1341          if any one is set. */          if any one is set. */
1342    
1343          if (!condition && condcode == OP_NRREF && recno != RREF_ANY)          if (!condition && condcode == OP_NRREF)
1344            {            {
1345            uschar *slotA = md->name_table;            pcre_uchar *slotA = md->name_table;
1346            for (i = 0; i < md->name_count; i++)            for (i = 0; i < md->name_count; i++)
1347              {              {
1348              if (GET2(slotA, 0) == recno) break;              if (GET2(slotA, 0) == recno) break;
# Line 982  for (;;) Line 1355  for (;;)
1355    
1356            if (i < md->name_count)            if (i < md->name_count)
1357              {              {
1358              uschar *slotB = slotA;              pcre_uchar *slotB = slotA;
1359              while (slotB > md->name_table)              while (slotB > md->name_table)
1360                {                {
1361                slotB -= md->name_entry_size;                slotB -= md->name_entry_size;
1362                if (strcmp((char *)slotA + 2, (char *)slotB + 2) == 0)                if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1363                  {                  {
1364                  condition = GET2(slotB, 0) == md->recursive->group_num;                  condition = GET2(slotB, 0) == md->recursive->group_num;
1365                  if (condition) break;                  if (condition) break;
# Line 1002  for (;;) Line 1375  for (;;)
1375                for (i++; i < md->name_count; i++)                for (i++; i < md->name_count; i++)
1376                  {                  {
1377                  slotB += md->name_entry_size;                  slotB += md->name_entry_size;
1378                  if (strcmp((char *)slotA + 2, (char *)slotB + 2) == 0)                  if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1379                    {                    {
1380                    condition = GET2(slotB, 0) == md->recursive->group_num;                    condition = GET2(slotB, 0) == md->recursive->group_num;
1381                    if (condition) break;                    if (condition) break;
# Line 1015  for (;;) Line 1388  for (;;)
1388    
1389          /* Chose branch according to the condition */          /* Chose branch according to the condition */
1390    
1391          ecode += condition? 3 : GET(ecode, 1);          ecode += condition? 1 + IMM2_SIZE : GET(ecode, 1);
1392          }          }
1393        }        }
1394    
# Line 1031  for (;;) Line 1404  for (;;)
1404    
1405        if (!condition && condcode == OP_NCREF)        if (!condition && condcode == OP_NCREF)
1406          {          {
1407          int refno = offset >> 1;          unsigned int refno = offset >> 1;
1408          uschar *slotA = md->name_table;          pcre_uchar *slotA = md->name_table;
1409    
1410          for (i = 0; i < md->name_count; i++)          for (i = 0; i < md->name_count; i++)
1411            {            {
# Line 1046  for (;;) Line 1419  for (;;)
1419    
1420          if (i < md->name_count)          if (i < md->name_count)
1421            {            {
1422            uschar *slotB = slotA;            pcre_uchar *slotB = slotA;
1423            while (slotB > md->name_table)            while (slotB > md->name_table)
1424              {              {
1425              slotB -= md->name_entry_size;              slotB -= md->name_entry_size;
1426              if (strcmp((char *)slotA + 2, (char *)slotB + 2) == 0)              if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1427                {                {
1428                offset = GET2(slotB, 0) << 1;                offset = GET2(slotB, 0) << 1;
1429                condition = offset < offset_top &&                condition = offset < offset_top &&
# Line 1068  for (;;) Line 1441  for (;;)
1441              for (i++; i < md->name_count; i++)              for (i++; i < md->name_count; i++)
1442                {                {
1443                slotB += md->name_entry_size;                slotB += md->name_entry_size;
1444                if (strcmp((char *)slotA + 2, (char *)slotB + 2) == 0)                if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1445                  {                  {
1446                  offset = GET2(slotB, 0) << 1;                  offset = GET2(slotB, 0) << 1;
1447                  condition = offset < offset_top &&                  condition = offset < offset_top &&
# Line 1083  for (;;) Line 1456  for (;;)
1456    
1457        /* Chose branch according to the condition */        /* Chose branch according to the condition */
1458    
1459        ecode += condition? 3 : GET(ecode, 1);        ecode += condition? 1 + IMM2_SIZE : GET(ecode, 1);
1460        }        }
1461    
1462      else if (condcode == OP_DEF)     /* DEFINE - always false */      else if (condcode == OP_DEF)     /* DEFINE - always false */
# Line 1093  for (;;) Line 1466  for (;;)
1466        }        }
1467    
1468      /* The condition is an assertion. Call match() to evaluate it - setting      /* The condition is an assertion. Call match() to evaluate it - setting
1469      the final argument match_condassert causes it to stop at the end of an      md->match_function_type to MATCH_CONDASSERT causes it to stop at the end of
1470      assertion. */      an assertion. */
1471    
1472      else      else
1473        {        {
1474        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL,        md->match_function_type = MATCH_CONDASSERT;
1475            match_condassert, RM3);        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM3);
1476        if (rrc == MATCH_MATCH)        if (rrc == MATCH_MATCH)
1477          {          {
1478            if (md->end_offset_top > offset_top)
1479              offset_top = md->end_offset_top;  /* Captures may have happened */
1480          condition = TRUE;          condition = TRUE;
1481          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);
1482          while (*ecode == OP_ALT) ecode += GET(ecode, 1);          while (*ecode == OP_ALT) ecode += GET(ecode, 1);
1483          }          }
1484        else if (rrc != MATCH_NOMATCH &&  
1485                (rrc != MATCH_THEN || md->start_match_ptr != ecode))        /* PCRE doesn't allow the effect of (*THEN) to escape beyond an
1486          assertion; it is therefore treated as NOMATCH. */
1487    
1488          else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
1489          {          {
1490          RRETURN(rrc);         /* Need braces because of following else */          RRETURN(rrc);         /* Need braces because of following else */
1491          }          }
# Line 1118  for (;;) Line 1496  for (;;)
1496          }          }
1497        }        }
1498    
1499      /* We are now at the branch that is to be obeyed. As there is only one,      /* We are now at the branch that is to be obeyed. As there is only one, can
1500      we can use tail recursion to avoid using another stack frame, except when      use tail recursion to avoid using another stack frame, except when there is
1501      match_cbegroup is required for an unlimited repeat of a possibly empty      unlimited repeat of a possibly empty group. In the latter case, a recursive
1502      group. If the second alternative doesn't exist, we can just plough on. */      call to match() is always required, unless the second alternative doesn't
1503        exist, in which case we can just plough on. Note that, for compatibility
1504        with Perl, the | in a conditional group is NOT treated as creating two
1505        alternatives. If a THEN is encountered in the branch, it propagates out to
1506        the enclosing alternative (unless nested in a deeper set of alternatives,
1507        of course). */
1508    
1509      if (condition || *ecode == OP_ALT)      if (condition || *ecode == OP_ALT)
1510        {        {
1511        ecode += 1 + LINK_SIZE;        if (op != OP_SCOND)
       if (op == OP_SCOND)        /* Possibly empty group */  
1512          {          {
1513          RMATCH(eptr, ecode, offset_top, md, ims, eptrb, match_cbegroup, RM49);          ecode += 1 + LINK_SIZE;
         RRETURN(rrc);  
         }  
       else                       /* Group must match something */  
         {  
         flags = 0;  
1514          goto TAIL_RECURSE;          goto TAIL_RECURSE;
1515          }          }
1516    
1517          md->match_function_type = MATCH_CBEGROUP;
1518          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM49);
1519          RRETURN(rrc);
1520        }        }
1521      else                         /* Condition false & no alternative */  
1522         /* Condition false & no alternative; continue after the group. */
1523    
1524        else
1525        {        {
1526        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
1527        }        }
# Line 1148  for (;;) Line 1532  for (;;)
1532      to close any currently open capturing brackets. */      to close any currently open capturing brackets. */
1533    
1534      case OP_CLOSE:      case OP_CLOSE:
1535      number = GET2(ecode, 1);      number = GET2(ecode, 1);   /* Must be less than 65536 */
1536      offset = number << 1;      offset = number << 1;
1537    
1538  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
# Line 1156  for (;;) Line 1540  for (;;)
1540        printf("\n");        printf("\n");
1541  #endif  #endif
1542    
1543      md->capture_last = number;      md->capture_last = (md->capture_last & OVFLMASK) | number;
1544      if (offset >= md->offset_max) md->offset_overflow = TRUE; else      if (offset >= md->offset_max) md->capture_last |= OVFLBIT; else
1545        {        {
1546        md->offset_vector[offset] =        md->offset_vector[offset] =
1547          md->offset_vector[md->offset_end - number];          md->offset_vector[md->offset_end - number];
1548        md->offset_vector[offset+1] = (int)(eptr - md->start_subject);        md->offset_vector[offset+1] = (int)(eptr - md->start_subject);
1549        if (offset_top <= offset) offset_top = offset + 2;        if (offset_top <= offset) offset_top = offset + 2;
1550        }        }
1551      ecode += 3;      ecode += 1 + IMM2_SIZE;
1552      break;      break;
1553    
1554    
1555      /* End of the pattern, either real or forced. If we are in a top-level      /* End of the pattern, either real or forced. */
     recursion, we should restore the offsets appropriately and continue from  
     after the call. */  
1556    
     case OP_ACCEPT:  
1557      case OP_END:      case OP_END:
1558      if (md->recursive != NULL && md->recursive->group_num == 0)      case OP_ACCEPT:
1559        {      case OP_ASSERT_ACCEPT:
       recursion_info *rec = md->recursive;  
       DPRINTF(("End of pattern in a (?0) recursion\n"));  
       md->recursive = rec->prevrec;  
       memmove(md->offset_vector, rec->offset_save,  
         rec->saved_max * sizeof(int));  
       offset_top = rec->save_offset_top;  
       ims = original_ims;  
       ecode = rec->after_call;  
       break;  
       }  
1560    
1561      /* Otherwise, if we have matched an empty string, fail if PCRE_NOTEMPTY is      /* If we have matched an empty string, fail if not in an assertion and not
1562      set, or if PCRE_NOTEMPTY_ATSTART is set and we have matched at the start of      in a recursion if either PCRE_NOTEMPTY is set, or if PCRE_NOTEMPTY_ATSTART
1563      the subject. In both cases, backtracking will then try other alternatives,      is set and we have matched at the start of the subject. In both cases,
1564      if any. */      backtracking will then try other alternatives, if any. */
1565    
1566      if (eptr == mstart &&      if (eptr == mstart && op != OP_ASSERT_ACCEPT &&
1567          (md->notempty ||           md->recursive == NULL &&
1568            (md->notempty_atstart &&           (md->notempty ||
1569              mstart == md->start_subject + md->start_offset)))             (md->notempty_atstart &&
1570        MRRETURN(MATCH_NOMATCH);               mstart == md->start_subject + md->start_offset)))
1571          RRETURN(MATCH_NOMATCH);
1572    
1573      /* Otherwise, we have a match. */      /* Otherwise, we have a match. */
1574    
# Line 1205  for (;;) Line 1577  for (;;)
1577      md->start_match_ptr = mstart;       /* and the start (\K can modify) */      md->start_match_ptr = mstart;       /* and the start (\K can modify) */
1578    
1579      /* For some reason, the macros don't work properly if an expression is      /* For some reason, the macros don't work properly if an expression is
1580      given as the argument to MRRETURN when the heap is in use. */      given as the argument to RRETURN when the heap is in use. */
1581    
1582      rrc = (op == OP_END)? MATCH_MATCH : MATCH_ACCEPT;      rrc = (op == OP_END)? MATCH_MATCH : MATCH_ACCEPT;
1583      MRRETURN(rrc);      RRETURN(rrc);
   
     /* Change option settings */  
   
     case OP_OPT:  
     ims = ecode[1];  
     ecode += 2;  
     DPRINTF(("ims set to %02lx\n", ims));  
     break;  
1584    
1585      /* Assertion brackets. Check the alternative branches in turn - the      /* Assertion brackets. Check the alternative branches in turn - the
1586      matching won't pass the KET for an assertion. If any one branch matches,      matching won't pass the KET for an assertion. If any one branch matches,
1587      the assertion is true. Lookbehind assertions have an OP_REVERSE item at the      the assertion is true. Lookbehind assertions have an OP_REVERSE item at the
1588      start of each branch to move the current point backwards, so the code at      start of each branch to move the current point backwards, so the code at
1589      this level is identical to the lookahead case. */      this level is identical to the lookahead case. When the assertion is part
1590        of a condition, we want to return immediately afterwards. The caller of
1591        this incarnation of the match() function will have set MATCH_CONDASSERT in
1592        md->match_function type, and one of these opcodes will be the first opcode
1593        that is processed. We use a local variable that is preserved over calls to
1594        match() to remember this case. */
1595    
1596      case OP_ASSERT:      case OP_ASSERT:
1597      case OP_ASSERTBACK:      case OP_ASSERTBACK:
1598        save_mark = md->mark;
1599        if (md->match_function_type == MATCH_CONDASSERT)
1600          {
1601          condassert = TRUE;
1602          md->match_function_type = 0;
1603          }
1604        else condassert = FALSE;
1605    
1606        /* Loop for each branch */
1607    
1608      do      do
1609        {        {
1610        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM4);
1611          RM4);  
1612          /* A match means that the assertion is true; break out of the loop
1613          that matches its alternatives. */
1614    
1615        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
1616          {          {
1617          mstart = md->start_match_ptr;   /* In case \K reset it */          mstart = md->start_match_ptr;   /* In case \K reset it */
1618          break;          break;
1619          }          }
1620        if (rrc != MATCH_NOMATCH &&  
1621            (rrc != MATCH_THEN || md->start_match_ptr != ecode))        /* If not matched, restore the previous mark setting. */
1622          RRETURN(rrc);  
1623          md->mark = save_mark;
1624    
1625          /* See comment in the code for capturing groups above about handling
1626          THEN. */
1627    
1628          if (rrc == MATCH_THEN)
1629            {
1630            next = ecode + GET(ecode,1);
1631            if (md->start_match_ptr < next &&
1632                (*ecode == OP_ALT || *next == OP_ALT))
1633              rrc = MATCH_NOMATCH;
1634            }
1635    
1636          /* Anything other than NOMATCH causes the entire assertion to fail,
1637          passing back the return code. This includes COMMIT, SKIP, PRUNE and an
1638          uncaptured THEN, which means they take their normal effect. This
1639          consistent approach does not always have exactly the same effect as in
1640          Perl. */
1641    
1642          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1643        ecode += GET(ecode, 1);        ecode += GET(ecode, 1);
1644        }        }
1645      while (*ecode == OP_ALT);      while (*ecode == OP_ALT);   /* Continue for next alternative */
1646      if (*ecode == OP_KET) MRRETURN(MATCH_NOMATCH);  
1647        /* If we have tried all the alternative branches, the assertion has
1648        failed. If not, we broke out after a match. */
1649    
1650        if (*ecode == OP_KET) RRETURN(MATCH_NOMATCH);
1651    
1652      /* If checking an assertion for a condition, return MATCH_MATCH. */      /* If checking an assertion for a condition, return MATCH_MATCH. */
1653    
1654      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);      if (condassert) RRETURN(MATCH_MATCH);
1655    
1656      /* Continue from after the assertion, updating the offsets high water      /* Continue from after a successful assertion, updating the offsets high
1657      mark, since extracts may have been taken during the assertion. */      water mark, since extracts may have been taken during the assertion. */
1658    
1659      do ecode += GET(ecode,1); while (*ecode == OP_ALT);      do ecode += GET(ecode,1); while (*ecode == OP_ALT);
1660      ecode += 1 + LINK_SIZE;      ecode += 1 + LINK_SIZE;
1661      offset_top = md->end_offset_top;      offset_top = md->end_offset_top;
1662      continue;      continue;
1663    
1664      /* Negative assertion: all branches must fail to match. Encountering SKIP,      /* Negative assertion: all branches must fail to match for the assertion to
1665      PRUNE, or COMMIT means we must assume failure without checking subsequent      succeed. */
     branches. */  
1666    
1667      case OP_ASSERT_NOT:      case OP_ASSERT_NOT:
1668      case OP_ASSERTBACK_NOT:      case OP_ASSERTBACK_NOT:
1669        save_mark = md->mark;
1670        if (md->match_function_type == MATCH_CONDASSERT)
1671          {
1672          condassert = TRUE;
1673          md->match_function_type = 0;
1674          }
1675        else condassert = FALSE;
1676    
1677        /* Loop for each alternative branch. */
1678    
1679      do      do
1680        {        {
1681        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM5);
1682          RM5);        md->mark = save_mark;   /* Always restore the mark setting */
1683        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) MRRETURN(MATCH_NOMATCH);  
1684        if (rrc == MATCH_SKIP || rrc == MATCH_PRUNE || rrc == MATCH_COMMIT)        switch(rrc)
1685          {          {
1686          do ecode += GET(ecode,1); while (*ecode == OP_ALT);          case MATCH_MATCH:            /* A successful match means */
1687            case MATCH_ACCEPT:           /* the assertion has failed. */
1688            RRETURN(MATCH_NOMATCH);
1689    
1690            case MATCH_NOMATCH:          /* Carry on with next branch */
1691          break;          break;
1692          }  
1693        if (rrc != MATCH_NOMATCH &&          /* See comment in the code for capturing groups above about handling
1694            (rrc != MATCH_THEN || md->start_match_ptr != ecode))          THEN. */
1695    
1696            case MATCH_THEN:
1697            next = ecode + GET(ecode,1);
1698            if (md->start_match_ptr < next &&
1699                (*ecode == OP_ALT || *next == OP_ALT))
1700              {
1701              rrc = MATCH_NOMATCH;
1702              break;
1703              }
1704            /* Otherwise fall through. */
1705    
1706            /* COMMIT, SKIP, PRUNE, and an uncaptured THEN cause the whole
1707            assertion to fail to match, without considering any more alternatives.
1708            Failing to match means the assertion is true. This is a consistent
1709            approach, but does not always have the same effect as in Perl. */
1710    
1711            case MATCH_COMMIT:
1712            case MATCH_SKIP:
1713            case MATCH_SKIP_ARG:
1714            case MATCH_PRUNE:
1715            do ecode += GET(ecode,1); while (*ecode == OP_ALT);
1716            goto NEG_ASSERT_TRUE;   /* Break out of alternation loop */
1717    
1718            /* Anything else is an error */
1719    
1720            default:
1721          RRETURN(rrc);          RRETURN(rrc);
1722            }
1723    
1724          /* Continue with next branch */
1725    
1726        ecode += GET(ecode,1);        ecode += GET(ecode,1);
1727        }        }
1728      while (*ecode == OP_ALT);      while (*ecode == OP_ALT);
1729    
1730      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);      /* All branches in the assertion failed to match. */
1731    
1732      ecode += 1 + LINK_SIZE;      NEG_ASSERT_TRUE:
1733        if (condassert) RRETURN(MATCH_MATCH);  /* Condition assertion */
1734        ecode += 1 + LINK_SIZE;                /* Continue with current branch */
1735      continue;      continue;
1736    
1737      /* Move the subject pointer back. This occurs only at the start of      /* Move the subject pointer back. This occurs only at the start of
# Line 1289  for (;;) Line 1740  for (;;)
1740      back a number of characters, not bytes. */      back a number of characters, not bytes. */
1741    
1742      case OP_REVERSE:      case OP_REVERSE:
1743  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
1744      if (utf8)      if (utf)
1745        {        {
1746        i = GET(ecode, 1);        i = GET(ecode, 1);
1747        while (i-- > 0)        while (i-- > 0)
1748          {          {
1749          eptr--;          eptr--;
1750          if (eptr < md->start_subject) MRRETURN(MATCH_NOMATCH);          if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);
1751          BACKCHAR(eptr);          BACKCHAR(eptr);
1752          }          }
1753        }        }
# Line 1307  for (;;) Line 1758  for (;;)
1758    
1759        {        {
1760        eptr -= GET(ecode, 1);        eptr -= GET(ecode, 1);
1761        if (eptr < md->start_subject) MRRETURN(MATCH_NOMATCH);        if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);
1762        }        }
1763    
1764      /* Save the earliest consulted character, then skip to next op code */      /* Save the earliest consulted character, then skip to next op code */
# Line 1321  for (;;) Line 1772  for (;;)
1772      function is able to force a failure. */      function is able to force a failure. */
1773    
1774      case OP_CALLOUT:      case OP_CALLOUT:
1775      if (pcre_callout != NULL)      if (PUBL(callout) != NULL)
1776        {        {
1777        pcre_callout_block cb;        PUBL(callout_block) cb;
1778        cb.version          = 1;   /* Version 1 of the callout block */        cb.version          = 2;   /* Version 1 of the callout block */
1779        cb.callout_number   = ecode[1];        cb.callout_number   = ecode[1];
1780        cb.offset_vector    = md->offset_vector;        cb.offset_vector    = md->offset_vector;
1781    #if defined COMPILE_PCRE8
1782        cb.subject          = (PCRE_SPTR)md->start_subject;        cb.subject          = (PCRE_SPTR)md->start_subject;
1783    #elif defined COMPILE_PCRE16
1784          cb.subject          = (PCRE_SPTR16)md->start_subject;
1785    #elif defined COMPILE_PCRE32
1786          cb.subject          = (PCRE_SPTR32)md->start_subject;
1787    #endif
1788        cb.subject_length   = (int)(md->end_subject - md->start_subject);        cb.subject_length   = (int)(md->end_subject - md->start_subject);
1789        cb.start_match      = (int)(mstart - md->start_subject);        cb.start_match      = (int)(mstart - md->start_subject);
1790        cb.current_position = (int)(eptr - md->start_subject);        cb.current_position = (int)(eptr - md->start_subject);
1791        cb.pattern_position = GET(ecode, 2);        cb.pattern_position = GET(ecode, 2);
1792        cb.next_item_length = GET(ecode, 2 + LINK_SIZE);        cb.next_item_length = GET(ecode, 2 + LINK_SIZE);
1793        cb.capture_top      = offset_top/2;        cb.capture_top      = offset_top/2;
1794        cb.capture_last     = md->capture_last;        cb.capture_last     = md->capture_last & CAPLMASK;
1795          /* Internal change requires this for API compatibility. */
1796          if (cb.capture_last == 0) cb.capture_last = -1;
1797        cb.callout_data     = md->callout_data;        cb.callout_data     = md->callout_data;
1798        if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);        cb.mark             = md->nomatch_mark;
1799          if ((rrc = (*PUBL(callout))(&cb)) > 0) RRETURN(MATCH_NOMATCH);
1800        if (rrc < 0) RRETURN(rrc);        if (rrc < 0) RRETURN(rrc);
1801        }        }
1802      ecode += 2 + 2*LINK_SIZE;      ecode += 2 + 2*LINK_SIZE;
# Line 1346  for (;;) Line 1806  for (;;)
1806      offset data is the offset to the starting bracket from the start of the      offset data is the offset to the starting bracket from the start of the
1807      whole pattern. (This is so that it works from duplicated subpatterns.)      whole pattern. (This is so that it works from duplicated subpatterns.)
1808    
1809      If there are any capturing brackets started but not finished, we have to      The state of the capturing groups is preserved over recursion, and
1810      save their starting points and reinstate them after the recursion. However,      re-instated afterwards. We don't know how many are started and not yet
1811      we don't know how many such there are (offset_top records the completed      finished (offset_top records the completed total) so we just have to save
1812      total) so we just have to save all the potential data. There may be up to      all the potential data. There may be up to 65535 such values, which is too
1813      65535 such values, which is too large to put on the stack, but using malloc      large to put on the stack, but using malloc for small numbers seems
1814      for small numbers seems expensive. As a compromise, the stack is used when      expensive. As a compromise, the stack is used when there are no more than
1815      there are no more than REC_STACK_SAVE_MAX values to store; otherwise malloc      REC_STACK_SAVE_MAX values to store; otherwise malloc is used.
     is used. A problem is what to do if the malloc fails ... there is no way of  
     returning to the top level with an error. Save the top REC_STACK_SAVE_MAX  
     values on the stack, and accept that the rest may be wrong.  
1816    
1817      There are also other values that have to be saved. We use a chained      There are also other values that have to be saved. We use a chained
1818      sequence of blocks that actually live on the stack. Thanks to Robin Houston      sequence of blocks that actually live on the stack. Thanks to Robin Houston
1819      for the original version of this logic. */      for the original version of this logic. It has, however, been hacked around
1820        a lot, so he is not to blame for the current way it works. */
1821    
1822      case OP_RECURSE:      case OP_RECURSE:
1823        {        {
1824          recursion_info *ri;
1825          unsigned int recno;
1826    
1827        callpat = md->start_code + GET(ecode, 1);        callpat = md->start_code + GET(ecode, 1);
1828        new_recursive.group_num = (callpat == md->start_code)? 0 :        recno = (callpat == md->start_code)? 0 :
1829          GET2(callpat, 1 + LINK_SIZE);          GET2(callpat, 1 + LINK_SIZE);
1830    
1831          /* Check for repeating a recursion without advancing the subject pointer.
1832          This should catch convoluted mutual recursions. (Some simple cases are
1833          caught at compile time.) */
1834    
1835          for (ri = md->recursive; ri != NULL; ri = ri->prevrec)
1836            if (recno == ri->group_num && eptr == ri->subject_position)
1837              RRETURN(PCRE_ERROR_RECURSELOOP);
1838    
1839        /* Add to "recursing stack" */        /* Add to "recursing stack" */
1840    
1841          new_recursive.group_num = recno;
1842          new_recursive.saved_capture_last = md->capture_last;
1843          new_recursive.subject_position = eptr;
1844        new_recursive.prevrec = md->recursive;        new_recursive.prevrec = md->recursive;
1845        md->recursive = &new_recursive;        md->recursive = &new_recursive;
1846    
1847        /* Find where to continue from afterwards */        /* Where to continue from afterwards */
1848    
1849        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
       new_recursive.after_call = ecode;  
1850    
1851        /* Now save the offset data. */        /* Now save the offset data */
1852    
1853        new_recursive.saved_max = md->offset_end;        new_recursive.saved_max = md->offset_end;
1854        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)
# Line 1385  for (;;) Line 1856  for (;;)
1856        else        else
1857          {          {
1858          new_recursive.offset_save =          new_recursive.offset_save =
1859            (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int));            (int *)(PUBL(malloc))(new_recursive.saved_max * sizeof(int));
1860          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);
1861          }          }
   
1862        memcpy(new_recursive.offset_save, md->offset_vector,        memcpy(new_recursive.offset_save, md->offset_vector,
1863              new_recursive.saved_max * sizeof(int));              new_recursive.saved_max * sizeof(int));
       new_recursive.save_offset_top = offset_top;  
1864    
1865        /* OK, now we can do the recursion. For each top-level alternative we        /* OK, now we can do the recursion. After processing each alternative,
1866        restore the offset and recursion data. */        restore the offset data and the last captured value. If there were nested
1867          recursions, md->recursive might be changed, so reset it before looping.
1868          */
1869    
1870        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));
1871        flags = (*callpat >= OP_SBRA)? match_cbegroup : 0;        cbegroup = (*callpat >= OP_SBRA);
1872        do        do
1873          {          {
1874          RMATCH(eptr, callpat + _pcre_OP_lengths[*callpat], offset_top,          if (cbegroup) md->match_function_type = MATCH_CBEGROUP;
1875            md, ims, eptrb, flags, RM6);          RMATCH(eptr, callpat + PRIV(OP_lengths)[*callpat], offset_top,
1876              md, eptrb, RM6);
1877            memcpy(md->offset_vector, new_recursive.offset_save,
1878                new_recursive.saved_max * sizeof(int));
1879            md->capture_last = new_recursive.saved_capture_last;
1880            md->recursive = new_recursive.prevrec;
1881          if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)          if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
1882            {            {
1883            DPRINTF(("Recursion matched\n"));            DPRINTF(("Recursion matched\n"));
           md->recursive = new_recursive.prevrec;  
1884            if (new_recursive.offset_save != stacksave)            if (new_recursive.offset_save != stacksave)
1885              (pcre_free)(new_recursive.offset_save);              (PUBL(free))(new_recursive.offset_save);
1886            MRRETURN(MATCH_MATCH);  
1887              /* Set where we got to in the subject, and reset the start in case
1888              it was changed by \K. This *is* propagated back out of a recursion,
1889              for Perl compatibility. */
1890    
1891              eptr = md->end_match_ptr;
1892              mstart = md->start_match_ptr;
1893              goto RECURSION_MATCHED;        /* Exit loop; end processing */
1894            }            }
1895          else if (rrc != MATCH_NOMATCH &&  
1896                  (rrc != MATCH_THEN || md->start_match_ptr != ecode))          /* PCRE does not allow THEN, SKIP, PRUNE or COMMIT to escape beyond a
1897            recursion; they cause a NOMATCH for the entire recursion. These codes
1898            are defined in a range that can be tested for. */
1899    
1900            if (rrc >= MATCH_BACKTRACK_MIN && rrc <= MATCH_BACKTRACK_MAX)
1901              RRETURN(MATCH_NOMATCH);
1902    
1903            /* Any return code other than NOMATCH is an error. */
1904    
1905            if (rrc != MATCH_NOMATCH)
1906            {            {
1907            DPRINTF(("Recursion gave error %d\n", rrc));            DPRINTF(("Recursion gave error %d\n", rrc));
1908            if (new_recursive.offset_save != stacksave)            if (new_recursive.offset_save != stacksave)
1909              (pcre_free)(new_recursive.offset_save);              (PUBL(free))(new_recursive.offset_save);
1910            RRETURN(rrc);            RRETURN(rrc);
1911            }            }
1912    
1913          md->recursive = &new_recursive;          md->recursive = &new_recursive;
         memcpy(md->offset_vector, new_recursive.offset_save,  
             new_recursive.saved_max * sizeof(int));  
1914          callpat += GET(callpat, 1);          callpat += GET(callpat, 1);
1915          }          }
1916        while (*callpat == OP_ALT);        while (*callpat == OP_ALT);
# Line 1429  for (;;) Line 1918  for (;;)
1918        DPRINTF(("Recursion didn't match\n"));        DPRINTF(("Recursion didn't match\n"));
1919        md->recursive = new_recursive.prevrec;        md->recursive = new_recursive.prevrec;
1920        if (new_recursive.offset_save != stacksave)        if (new_recursive.offset_save != stacksave)
1921          (pcre_free)(new_recursive.offset_save);          (PUBL(free))(new_recursive.offset_save);
1922        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
       }  
     /* Control never reaches here */  
   
     /* "Once" brackets are like assertion brackets except that after a match,  
     the point in the subject string is not moved back. Thus there can never be  
     a move back into the brackets. Friedl calls these "atomic" subpatterns.  
     Check the alternative branches in turn - the matching won't pass the KET  
     for this kind of subpattern. If any one branch matches, we carry on as at  
     the end of a normal bracket, leaving the subject pointer, but resetting  
     the start-of-match value in case it was changed by \K. */  
   
     case OP_ONCE:  
     prev = ecode;  
     saved_eptr = eptr;  
   
     do  
       {  
       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM7);  
       if (rrc == MATCH_MATCH)  /* Note: _not_ MATCH_ACCEPT */  
         {  
         mstart = md->start_match_ptr;  
         break;  
         }  
       if (rrc != MATCH_NOMATCH &&  
           (rrc != MATCH_THEN || md->start_match_ptr != ecode))  
         RRETURN(rrc);  
       ecode += GET(ecode,1);  
       }  
     while (*ecode == OP_ALT);  
   
     /* If hit the end of the group (which could be repeated), fail */  
   
     if (*ecode != OP_ONCE && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);  
   
     /* Continue as from after the assertion, updating the offsets high water  
     mark, since extracts may have been taken. */  
   
     do ecode += GET(ecode, 1); while (*ecode == OP_ALT);  
   
     offset_top = md->end_offset_top;  
     eptr = md->end_match_ptr;  
   
     /* For a non-repeating ket, just continue at this level. This also  
     happens for a repeating ket if no characters were matched in the group.  
     This is the forcible breaking of infinite loops as implemented in Perl  
     5.005. If there is an options reset, it will get obeyed in the normal  
     course of events. */  
   
     if (*ecode == OP_KET || eptr == saved_eptr)  
       {  
       ecode += 1+LINK_SIZE;  
       break;  
       }  
   
     /* The repeating kets try the rest of the pattern or restart from the  
     preceding bracket, in the appropriate order. The second "call" of match()  
     uses tail recursion, to avoid using another stack frame. We need to reset  
     any options that changed within the bracket before re-running it, so  
     check the next opcode. */  
   
     if (ecode[1+LINK_SIZE] == OP_OPT)  
       {  
       ims = (ims & ~PCRE_IMS) | ecode[4];  
       DPRINTF(("ims set to %02lx at group repeat\n", ims));  
1923        }        }
1924    
1925      if (*ecode == OP_KETRMIN)      RECURSION_MATCHED:
1926        {      break;
       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM8);  
       if (rrc != MATCH_NOMATCH) RRETURN(rrc);  
       ecode = prev;  
       flags = 0;  
       goto TAIL_RECURSE;  
       }  
     else  /* OP_KETRMAX */  
       {  
       RMATCH(eptr, prev, offset_top, md, ims, eptrb, match_cbegroup, RM9);  
       if (rrc != MATCH_NOMATCH) RRETURN(rrc);  
       ecode += 1 + LINK_SIZE;  
       flags = 0;  
       goto TAIL_RECURSE;  
       }  
     /* Control never gets here */  
1927    
1928      /* An alternation is the end of a branch; scan along to find the end of the      /* An alternation is the end of a branch; scan along to find the end of the
1929      bracketed group and go to there. */      bracketed group and go to there. */
# Line 1529  for (;;) Line 1939  for (;;)
1939      optional ones preceded by BRAZERO or BRAMINZERO. */      optional ones preceded by BRAZERO or BRAMINZERO. */
1940    
1941      case OP_BRAZERO:      case OP_BRAZERO:
1942        {      next = ecode + 1;
1943        next = ecode+1;      RMATCH(eptr, next, offset_top, md, eptrb, RM10);
1944        RMATCH(eptr, next, offset_top, md, ims, eptrb, 0, RM10);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1945        if (rrc != MATCH_NOMATCH) RRETURN(rrc);      do next += GET(next, 1); while (*next == OP_ALT);
1946        do next += GET(next,1); while (*next == OP_ALT);      ecode = next + 1 + LINK_SIZE;
       ecode = next + 1 + LINK_SIZE;  
       }  
1947      break;      break;
1948    
1949      case OP_BRAMINZERO:      case OP_BRAMINZERO:
1950        {      next = ecode + 1;
1951        next = ecode+1;      do next += GET(next, 1); while (*next == OP_ALT);
1952        do next += GET(next, 1); while (*next == OP_ALT);      RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, eptrb, RM11);
1953        RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0, RM11);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1954        if (rrc != MATCH_NOMATCH) RRETURN(rrc);      ecode++;
       ecode++;  
       }  
1955      break;      break;
1956    
1957      case OP_SKIPZERO:      case OP_SKIPZERO:
1958        {      next = ecode+1;
1959        next = ecode+1;      do next += GET(next,1); while (*next == OP_ALT);
1960        do next += GET(next,1); while (*next == OP_ALT);      ecode = next + 1 + LINK_SIZE;
       ecode = next + 1 + LINK_SIZE;  
       }  
1961      break;      break;
1962    
1963        /* BRAPOSZERO occurs before a possessive bracket group. Don't do anything
1964        here; just jump to the group, with allow_zero set TRUE. */
1965    
1966        case OP_BRAPOSZERO:
1967        op = *(++ecode);
1968        allow_zero = TRUE;
1969        if (op == OP_CBRAPOS || op == OP_SCBRAPOS) goto POSSESSIVE_CAPTURE;
1970          goto POSSESSIVE_NON_CAPTURE;
1971    
1972      /* End of a group, repeated or non-repeating. */      /* End of a group, repeated or non-repeating. */
1973    
1974      case OP_KET:      case OP_KET:
1975      case OP_KETRMIN:      case OP_KETRMIN:
1976      case OP_KETRMAX:      case OP_KETRMAX:
1977        case OP_KETRPOS:
1978      prev = ecode - GET(ecode, 1);      prev = ecode - GET(ecode, 1);
1979    
1980      /* If this was a group that remembered the subject start, in order to break      /* If this was a group that remembered the subject start, in order to break
1981      infinite repeats of empty string matches, retrieve the subject start from      infinite repeats of empty string matches, retrieve the subject start from
1982      the chain. Otherwise, set it NULL. */      the chain. Otherwise, set it NULL. */
1983    
1984      if (*prev >= OP_SBRA)      if (*prev >= OP_SBRA || *prev == OP_ONCE)
1985        {        {
1986        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */
1987        eptrb = eptrb->epb_prev;              /* Backup to previous group */        eptrb = eptrb->epb_prev;              /* Backup to previous group */
1988        }        }
1989      else saved_eptr = NULL;      else saved_eptr = NULL;
1990    
1991      /* If we are at the end of an assertion group or an atomic group, stop      /* If we are at the end of an assertion group or a non-capturing atomic
1992      matching and return MATCH_MATCH, but record the current high water mark for      group, stop matching and return MATCH_MATCH, but record the current high
1993      use by positive assertions. We also need to record the match start in case      water mark for use by positive assertions. We also need to record the match
1994      it was changed by \K. */      start in case it was changed by \K. */
1995    
1996      if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT ||      if ((*prev >= OP_ASSERT && *prev <= OP_ASSERTBACK_NOT) ||
1997          *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT ||           *prev == OP_ONCE_NC)
         *prev == OP_ONCE)  
1998        {        {
1999        md->end_match_ptr = eptr;      /* For ONCE */        md->end_match_ptr = eptr;      /* For ONCE_NC */
2000        md->end_offset_top = offset_top;        md->end_offset_top = offset_top;
2001        md->start_match_ptr = mstart;        md->start_match_ptr = mstart;
2002        MRRETURN(MATCH_MATCH);        RRETURN(MATCH_MATCH);         /* Sets md->mark */
2003        }        }
2004    
2005      /* For capturing groups we have to check the group number back at the start      /* For capturing groups we have to check the group number back at the start
2006      and if necessary complete handling an extraction by setting the offsets and      and if necessary complete handling an extraction by setting the offsets and
2007      bumping the high water mark. Note that whole-pattern recursion is coded as      bumping the high water mark. Whole-pattern recursion is coded as a recurse
2008      a recurse into group 0, so it won't be picked up here. Instead, we catch it      into group 0, so it won't be picked up here. Instead, we catch it when the
2009      when the OP_END is reached. Other recursion is handled here. */      OP_END is reached. Other recursion is handled here. We just have to record
2010        the current subject position and start match pointer and give a MATCH
2011        return. */
2012    
2013      if (*prev == OP_CBRA || *prev == OP_SCBRA)      if (*prev == OP_CBRA || *prev == OP_SCBRA ||
2014            *prev == OP_CBRAPOS || *prev == OP_SCBRAPOS)
2015        {        {
2016        number = GET2(prev, 1+LINK_SIZE);        number = GET2(prev, 1+LINK_SIZE);
2017        offset = number << 1;        offset = number << 1;
# Line 1605  for (;;) Line 2021  for (;;)
2021        printf("\n");        printf("\n");
2022  #endif  #endif
2023    
2024        md->capture_last = number;        /* Handle a recursively called group. */
2025        if (offset >= md->offset_max) md->offset_overflow = TRUE; else  
2026          if (md->recursive != NULL && md->recursive->group_num == number)
2027            {
2028            md->end_match_ptr = eptr;
2029            md->start_match_ptr = mstart;
2030            RRETURN(MATCH_MATCH);
2031            }
2032    
2033          /* Deal with capturing */
2034    
2035          md->capture_last = (md->capture_last & OVFLMASK) | number;
2036          if (offset >= md->offset_max) md->capture_last |= OVFLBIT; else
2037          {          {
2038            /* If offset is greater than offset_top, it means that we are
2039            "skipping" a capturing group, and that group's offsets must be marked
2040            unset. In earlier versions of PCRE, all the offsets were unset at the
2041            start of matching, but this doesn't work because atomic groups and
2042            assertions can cause a value to be set that should later be unset.
2043            Example: matching /(?>(a))b|(a)c/ against "ac". This sets group 1 as
2044            part of the atomic group, but this is not on the final matching path,
2045            so must be unset when 2 is set. (If there is no group 2, there is no
2046            problem, because offset_top will then be 2, indicating no capture.) */
2047    
2048            if (offset > offset_top)
2049              {
2050              register int *iptr = md->offset_vector + offset_top;
2051              register int *iend = md->offset_vector + offset;
2052              while (iptr < iend) *iptr++ = -1;
2053              }
2054    
2055            /* Now make the extraction */
2056    
2057          md->offset_vector[offset] =          md->offset_vector[offset] =
2058            md->offset_vector[md->offset_end - number];            md->offset_vector[md->offset_end - number];
2059          md->offset_vector[offset+1] = (int)(eptr - md->start_subject);          md->offset_vector[offset+1] = (int)(eptr - md->start_subject);
2060          if (offset_top <= offset) offset_top = offset + 2;          if (offset_top <= offset) offset_top = offset + 2;
2061          }          }
2062          }
2063    
2064        /* Handle a recursively called group. Restore the offsets      /* For an ordinary non-repeating ket, just continue at this level. This
2065        appropriately and continue from after the call. */      also happens for a repeating ket if no characters were matched in the
2066        group. This is the forcible breaking of infinite loops as implemented in
2067        Perl 5.005. For a non-repeating atomic group that includes captures,
2068        establish a backup point by processing the rest of the pattern at a lower
2069        level. If this results in a NOMATCH return, pass MATCH_ONCE back to the
2070        original OP_ONCE level, thereby bypassing intermediate backup points, but
2071        resetting any captures that happened along the way. */
2072    
2073        if (md->recursive != NULL && md->recursive->group_num == number)      if (*ecode == OP_KET || eptr == saved_eptr)
2074          {
2075          if (*prev == OP_ONCE)
2076          {          {
2077          recursion_info *rec = md->recursive;          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM12);
2078          DPRINTF(("Recursion (%d) succeeded - continuing\n", number));          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2079          md->recursive = rec->prevrec;          md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
2080          memcpy(md->offset_vector, rec->offset_save,          RRETURN(MATCH_ONCE);
           rec->saved_max * sizeof(int));  
         offset_top = rec->save_offset_top;  
         ecode = rec->after_call;  
         ims = original_ims;  
         break;  
2081          }          }
2082          ecode += 1 + LINK_SIZE;    /* Carry on at this level */
2083          break;
2084        }        }
2085    
2086      /* For both capturing and non-capturing groups, reset the value of the ims      /* OP_KETRPOS is a possessive repeating ket. Remember the current position,
2087      flags, in case they got changed during the group. */      and return the MATCH_KETRPOS. This makes it possible to do the repeats one
2088        at a time from the outer level, thus saving stack. */
2089    
2090      ims = original_ims;      if (*ecode == OP_KETRPOS)
     DPRINTF(("ims reset to %02lx\n", ims));  
   
     /* For a non-repeating ket, just continue at this level. This also  
     happens for a repeating ket if no characters were matched in the group.  
     This is the forcible breaking of infinite loops as implemented in Perl  
     5.005. If there is an options reset, it will get obeyed in the normal  
     course of events. */  
   
     if (*ecode == OP_KET || eptr == saved_eptr)  
2091        {        {
2092        ecode += 1 + LINK_SIZE;        md->end_match_ptr = eptr;
2093        break;        md->end_offset_top = offset_top;
2094          RRETURN(MATCH_KETRPOS);
2095        }        }
2096    
2097      /* The repeating kets try the rest of the pattern or restart from the      /* The normal repeating kets try the rest of the pattern or restart from
2098      preceding bracket, in the appropriate order. In the second case, we can use      the preceding bracket, in the appropriate order. In the second case, we can
2099      tail recursion to avoid using another stack frame, unless we have an      use tail recursion to avoid using another stack frame, unless we have an
2100      unlimited repeat of a group that can match an empty string. */      an atomic group or an unlimited repeat of a group that can match an empty
2101        string. */
     flags = (*prev >= OP_SBRA)? match_cbegroup : 0;  
2102    
2103      if (*ecode == OP_KETRMIN)      if (*ecode == OP_KETRMIN)
2104        {        {
2105        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0, RM12);        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM7);
2106        if (rrc != MATCH_NOMATCH) RRETURN(rrc);        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2107        if (flags != 0)    /* Could match an empty string */        if (*prev == OP_ONCE)
2108            {
2109            RMATCH(eptr, prev, offset_top, md, eptrb, RM8);
2110            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2111            md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
2112            RRETURN(MATCH_ONCE);
2113            }
2114          if (*prev >= OP_SBRA)    /* Could match an empty string */
2115          {          {
2116          RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM50);          RMATCH(eptr, prev, offset_top, md, eptrb, RM50);
2117          RRETURN(rrc);          RRETURN(rrc);
2118          }          }
2119        ecode = prev;        ecode = prev;
# Line 1670  for (;;) Line 2121  for (;;)
2121        }        }
2122      else  /* OP_KETRMAX */      else  /* OP_KETRMAX */
2123        {        {
2124        RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM13);        RMATCH(eptr, prev, offset_top, md, eptrb, RM13);
2125          if (rrc == MATCH_ONCE && md->once_target == prev) rrc = MATCH_NOMATCH;
2126        if (rrc != MATCH_NOMATCH) RRETURN(rrc);        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2127          if (*prev == OP_ONCE)
2128            {
2129            RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM9);
2130            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2131            md->once_target = prev;
2132            RRETURN(MATCH_ONCE);
2133            }
2134        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
       flags = 0;  
2135        goto TAIL_RECURSE;        goto TAIL_RECURSE;
2136        }        }
2137      /* Control never gets here */      /* Control never gets here */
2138    
2139      /* Start of subject unless notbol, or after internal newline if multiline */      /* Not multiline mode: start of subject assertion, unless notbol. */
2140    
2141      case OP_CIRC:      case OP_CIRC:
2142      if (md->notbol && eptr == md->start_subject) MRRETURN(MATCH_NOMATCH);      if (md->notbol && eptr == md->start_subject) RRETURN(MATCH_NOMATCH);
2143      if ((ims & PCRE_MULTILINE) != 0)  
       {  
       if (eptr != md->start_subject &&  
           (eptr == md->end_subject || !WAS_NEWLINE(eptr)))  
         MRRETURN(MATCH_NOMATCH);  
       ecode++;  
       break;  
       }  
     /* ... else fall through */  
   
2144      /* Start of subject assertion */      /* Start of subject assertion */
2145    
2146      case OP_SOD:      case OP_SOD:
2147      if (eptr != md->start_subject) MRRETURN(MATCH_NOMATCH);      if (eptr != md->start_subject) RRETURN(MATCH_NOMATCH);
2148        ecode++;
2149        break;
2150    
2151        /* Multiline mode: start of subject unless notbol, or after any newline. */
2152    
2153        case OP_CIRCM:
2154        if (md->notbol && eptr == md->start_subject) RRETURN(MATCH_NOMATCH);
2155        if (eptr != md->start_subject &&
2156            (eptr == md->end_subject || !WAS_NEWLINE(eptr)))
2157          RRETURN(MATCH_NOMATCH);
2158      ecode++;      ecode++;
2159      break;      break;
2160    
2161      /* Start of match assertion */      /* Start of match assertion */
2162    
2163      case OP_SOM:      case OP_SOM:
2164      if (eptr != md->start_subject + md->start_offset) MRRETURN(MATCH_NOMATCH);      if (eptr != md->start_subject + md->start_offset) RRETURN(MATCH_NOMATCH);
2165      ecode++;      ecode++;
2166      break;      break;
2167    
# Line 1713  for (;;) Line 2172  for (;;)
2172      ecode++;      ecode++;
2173      break;      break;
2174    
2175      /* Assert before internal newline if multiline, or before a terminating      /* Multiline mode: assert before any newline, or before end of subject
2176      newline unless endonly is set, else end of subject unless noteol is set. */      unless noteol is set. */
2177    
2178      case OP_DOLL:      case OP_DOLLM:
2179      if ((ims & PCRE_MULTILINE) != 0)      if (eptr < md->end_subject)
2180        {        {
2181        if (eptr < md->end_subject)        if (!IS_NEWLINE(eptr))
         { if (!IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH); }  
       else  
2182          {          {
2183          if (md->noteol) MRRETURN(MATCH_NOMATCH);          if (md->partial != 0 &&
2184          SCHECK_PARTIAL();              eptr + 1 >= md->end_subject &&
2185                NLBLOCK->nltype == NLTYPE_FIXED &&
2186                NLBLOCK->nllen == 2 &&
2187                RAWUCHARTEST(eptr) == NLBLOCK->nl[0])
2188              {
2189              md->hitend = TRUE;
2190              if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL);
2191              }
2192            RRETURN(MATCH_NOMATCH);
2193          }          }
       ecode++;  
       break;  
2194        }        }
2195      else  /* Not multiline */      else
2196        {        {
2197        if (md->noteol) MRRETURN(MATCH_NOMATCH);        if (md->noteol) RRETURN(MATCH_NOMATCH);
2198        if (!md->endonly) goto ASSERT_NL_OR_EOS;        SCHECK_PARTIAL();
2199        }        }
2200        ecode++;
2201        break;
2202    
2203        /* Not multiline mode: assert before a terminating newline or before end of
2204        subject unless noteol is set. */
2205    
2206        case OP_DOLL:
2207        if (md->noteol) RRETURN(MATCH_NOMATCH);
2208        if (!md->endonly) goto ASSERT_NL_OR_EOS;
2209    
2210      /* ... else fall through for endonly */      /* ... else fall through for endonly */
2211    
2212      /* End of subject assertion (\z) */      /* End of subject assertion (\z) */
2213    
2214      case OP_EOD:      case OP_EOD:
2215      if (eptr < md->end_subject) MRRETURN(MATCH_NOMATCH);      if (eptr < md->end_subject) RRETURN(MATCH_NOMATCH);
2216      SCHECK_PARTIAL();      SCHECK_PARTIAL();
2217      ecode++;      ecode++;
2218      break;      break;
# Line 1751  for (;;) Line 2223  for (;;)
2223      ASSERT_NL_OR_EOS:      ASSERT_NL_OR_EOS:
2224      if (eptr < md->end_subject &&      if (eptr < md->end_subject &&
2225          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))
2226        MRRETURN(MATCH_NOMATCH);        {
2227          if (md->partial != 0 &&
2228              eptr + 1 >= md->end_subject &&
2229              NLBLOCK->nltype == NLTYPE_FIXED &&
2230              NLBLOCK->nllen == 2 &&
2231              RAWUCHARTEST(eptr) == NLBLOCK->nl[0])
2232            {
2233            md->hitend = TRUE;
2234            if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL);
2235            }
2236          RRETURN(MATCH_NOMATCH);
2237          }
2238    
2239      /* Either at end of string or \n before end. */      /* Either at end of string or \n before end. */
2240    
# Line 1770  for (;;) Line 2253  for (;;)
2253        be "non-word" characters. Remember the earliest consulted character for        be "non-word" characters. Remember the earliest consulted character for
2254        partial matching. */        partial matching. */
2255    
2256  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2257        if (utf8)        if (utf)
2258          {          {
2259          /* Get status of previous character */          /* Get status of previous character */
2260    
2261          if (eptr == md->start_subject) prev_is_word = FALSE; else          if (eptr == md->start_subject) prev_is_word = FALSE; else
2262            {            {
2263            USPTR lastptr = eptr - 1;            PCRE_PUCHAR lastptr = eptr - 1;
2264            while((*lastptr & 0xc0) == 0x80) lastptr--;            BACKCHAR(lastptr);
2265            if (lastptr < md->start_used_ptr) md->start_used_ptr = lastptr;            if (lastptr < md->start_used_ptr) md->start_used_ptr = lastptr;
2266            GETCHAR(c, lastptr);            GETCHAR(c, lastptr);
2267  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
# Line 1843  for (;;) Line 2326  for (;;)
2326              }              }
2327            else            else
2328  #endif  #endif
2329            prev_is_word = ((md->ctypes[eptr[-1]] & ctype_word) != 0);            prev_is_word = MAX_255(eptr[-1])
2330                && ((md->ctypes[eptr[-1]] & ctype_word) != 0);
2331            }            }
2332    
2333          /* Get status of next character */          /* Get status of next character */
# Line 1866  for (;;) Line 2350  for (;;)
2350            }            }
2351          else          else
2352  #endif  #endif
2353          cur_is_word = ((md->ctypes[*eptr] & ctype_word) != 0);          cur_is_word = MAX_255(*eptr)
2354              && ((md->ctypes[*eptr] & ctype_word) != 0);
2355          }          }
2356    
2357        /* Now see if the situation is what we want */        /* Now see if the situation is what we want */
2358    
2359        if ((*ecode++ == OP_WORD_BOUNDARY)?        if ((*ecode++ == OP_WORD_BOUNDARY)?
2360             cur_is_word == prev_is_word : cur_is_word != prev_is_word)             cur_is_word == prev_is_word : cur_is_word != prev_is_word)
2361          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
2362        }        }
2363      break;      break;
2364    
2365      /* Match a single character type; inline for speed */      /* Match any single character type except newline; have to take care with
2366        CRLF newlines and partial matching. */
2367    
2368      case OP_ANY:      case OP_ANY:
2369      if (IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH);      if (IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH);
2370        if (md->partial != 0 &&
2371            eptr + 1 >= md->end_subject &&
2372            NLBLOCK->nltype == NLTYPE_FIXED &&
2373            NLBLOCK->nllen == 2 &&
2374            RAWUCHARTEST(eptr) == NLBLOCK->nl[0])
2375          {
2376          md->hitend = TRUE;
2377          if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL);
2378          }
2379    
2380      /* Fall through */      /* Fall through */
2381    
2382        /* Match any single character whatsoever. */
2383    
2384      case OP_ALLANY:      case OP_ALLANY:
2385      if (eptr++ >= md->end_subject)      if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
2386        {        {                            /* not be updated before SCHECK_PARTIAL. */
2387        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2388        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2389        }        }
2390      if (utf8) while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;      eptr++;
2391    #ifdef SUPPORT_UTF
2392        if (utf) ACROSSCHAR(eptr < md->end_subject, *eptr, eptr++);
2393    #endif
2394      ecode++;      ecode++;
2395      break;      break;
2396    
# Line 1897  for (;;) Line 2398  for (;;)
2398      any byte, even newline, independent of the setting of PCRE_DOTALL. */      any byte, even newline, independent of the setting of PCRE_DOTALL. */
2399    
2400      case OP_ANYBYTE:      case OP_ANYBYTE:
2401      if (eptr++ >= md->end_subject)      if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
2402        {        {                            /* not be updated before SCHECK_PARTIAL. */
2403        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2404        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2405        }        }
2406        eptr++;
2407      ecode++;      ecode++;
2408      break;      break;
2409    
# Line 1909  for (;;) Line 2411  for (;;)
2411      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2412        {        {
2413        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2414        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2415        }        }
2416      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2417      if (      if (
2418  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2419         c < 256 &&         c < 256 &&
2420  #endif  #endif
2421         (md->ctypes[c] & ctype_digit) != 0         (md->ctypes[c] & ctype_digit) != 0
2422         )         )
2423        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2424      ecode++;      ecode++;
2425      break;      break;
2426    
# Line 1926  for (;;) Line 2428  for (;;)
2428      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2429        {        {
2430        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2431        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2432        }        }
2433      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2434      if (      if (
2435  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2436         c >= 256 ||         c > 255 ||
2437  #endif  #endif
2438         (md->ctypes[c] & ctype_digit) == 0         (md->ctypes[c] & ctype_digit) == 0
2439         )         )
2440        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2441      ecode++;      ecode++;
2442      break;      break;
2443    
# Line 1943  for (;;) Line 2445  for (;;)
2445      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2446        {        {
2447        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2448        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2449        }        }
2450      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2451      if (      if (
2452  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2453         c < 256 &&         c < 256 &&
2454  #endif  #endif
2455         (md->ctypes[c] & ctype_space) != 0         (md->ctypes[c] & ctype_space) != 0
2456         )         )
2457        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2458      ecode++;      ecode++;
2459      break;      break;
2460    
# Line 1960  for (;;) Line 2462  for (;;)
2462      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2463        {        {
2464        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2465        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2466        }        }
2467      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2468      if (      if (
2469  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2470         c >= 256 ||         c > 255 ||
2471  #endif  #endif
2472         (md->ctypes[c] & ctype_space) == 0         (md->ctypes[c] & ctype_space) == 0
2473         )         )
2474        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2475      ecode++;      ecode++;
2476      break;      break;
2477    
# Line 1977  for (;;) Line 2479  for (;;)
2479      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2480        {        {
2481        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2482        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2483        }        }
2484      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2485      if (      if (
2486  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2487         c < 256 &&         c < 256 &&
2488  #endif  #endif
2489         (md->ctypes[c] & ctype_word) != 0         (md->ctypes[c] & ctype_word) != 0
2490         )         )
2491        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2492      ecode++;      ecode++;
2493      break;      break;
2494    
# Line 1994  for (;;) Line 2496  for (;;)
2496      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2497        {        {
2498        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2499        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2500        }        }
2501      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2502      if (      if (
2503  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !(defined COMPILE_PCRE8)
2504         c >= 256 ||         c > 255 ||
2505  #endif  #endif
2506         (md->ctypes[c] & ctype_word) == 0         (md->ctypes[c] & ctype_word) == 0
2507         )         )
2508        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2509      ecode++;      ecode++;
2510      break;      break;
2511    
# Line 2011  for (;;) Line 2513  for (;;)
2513      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2514        {        {
2515        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2516        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2517        }        }
2518      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2519      switch(c)      switch(c)
2520        {        {
2521        default: MRRETURN(MATCH_NOMATCH);        default: RRETURN(MATCH_NOMATCH);
2522        case 0x000d:  
2523        if (eptr < md->end_subject && *eptr == 0x0a) eptr++;        case CHAR_CR:
2524          if (eptr >= md->end_subject)
2525            {
2526            SCHECK_PARTIAL();
2527            }
2528          else if (RAWUCHARTEST(eptr) == CHAR_LF) eptr++;
2529        break;        break;
2530    
2531        case 0x000a:        case CHAR_LF:
2532        break;        break;
2533    
2534        case 0x000b:        case CHAR_VT:
2535        case 0x000c:        case CHAR_FF:
2536        case 0x0085:        case CHAR_NEL:
2537    #ifndef EBCDIC
2538        case 0x2028:        case 0x2028:
2539        case 0x2029:        case 0x2029:
2540        if (md->bsr_anycrlf) MRRETURN(MATCH_NOMATCH);  #endif  /* Not EBCDIC */
2541          if (md->bsr_anycrlf) RRETURN(MATCH_NOMATCH);
2542        break;        break;
2543        }        }
2544      ecode++;      ecode++;
# Line 2039  for (;;) Line 2548  for (;;)
2548      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2549        {        {
2550        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2551        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2552        }        }
2553      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2554      switch(c)      switch(c)
2555        {        {
2556          HSPACE_CASES: RRETURN(MATCH_NOMATCH);  /* Byte and multibyte cases */
2557        default: break;        default: break;
       case 0x09:      /* HT */  
       case 0x20:      /* SPACE */  
       case 0xa0:      /* NBSP */  
       case 0x1680:    /* OGHAM SPACE MARK */  
       case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */  
       case 0x2000:    /* EN QUAD */  
       case 0x2001:    /* EM QUAD */  
       case 0x2002:    /* EN SPACE */  
       case 0x2003:    /* EM SPACE */  
       case 0x2004:    /* THREE-PER-EM SPACE */  
       case 0x2005:    /* FOUR-PER-EM SPACE */  
       case 0x2006:    /* SIX-PER-EM SPACE */  
       case 0x2007:    /* FIGURE SPACE */  
       case 0x2008:    /* PUNCTUATION SPACE */  
       case 0x2009:    /* THIN SPACE */  
       case 0x200A:    /* HAIR SPACE */  
       case 0x202f:    /* NARROW NO-BREAK SPACE */  
       case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */  
       case 0x3000:    /* IDEOGRAPHIC SPACE */  
       MRRETURN(MATCH_NOMATCH);  
2558        }        }
2559      ecode++;      ecode++;
2560      break;      break;
# Line 2073  for (;;) Line 2563  for (;;)
2563      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2564        {        {
2565        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2566        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2567        }        }
2568      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2569      switch(c)      switch(c)
2570        {        {
2571        default: MRRETURN(MATCH_NOMATCH);        HSPACE_CASES: break;  /* Byte and multibyte cases */
2572        case 0x09:      /* HT */        default: RRETURN(MATCH_NOMATCH);
       case 0x20:      /* SPACE */  
       case 0xa0:      /* NBSP */  
       case 0x1680:    /* OGHAM SPACE MARK */  
       case 0x180e:    /* MONGOLIAN VOWEL SEPARATOR */  
       case 0x2000:    /* EN QUAD */  
       case 0x2001:    /* EM QUAD */  
       case 0x2002:    /* EN SPACE */  
       case 0x2003:    /* EM SPACE */  
       case 0x2004:    /* THREE-PER-EM SPACE */  
       case 0x2005:    /* FOUR-PER-EM SPACE */  
       case 0x2006:    /* SIX-PER-EM SPACE */  
       case 0x2007:    /* FIGURE SPACE */  
       case 0x2008:    /* PUNCTUATION SPACE */  
       case 0x2009:    /* THIN SPACE */  
       case 0x200A:    /* HAIR SPACE */  
       case 0x202f:    /* NARROW NO-BREAK SPACE */  
       case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */  
       case 0x3000:    /* IDEOGRAPHIC SPACE */  
       break;  
2573        }        }
2574      ecode++;      ecode++;
2575      break;      break;
# Line 2107  for (;;) Line 2578  for (;;)
2578      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2579        {        {
2580        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2581        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2582        }        }
2583      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2584      switch(c)      switch(c)
2585        {        {
2586          VSPACE_CASES: RRETURN(MATCH_NOMATCH);
2587        default: break;        default: break;
       case 0x0a:      /* LF */  
       case 0x0b:      /* VT */  
       case 0x0c:      /* FF */  
       case 0x0d:      /* CR */  
       case 0x85:      /* NEL */  
       case 0x2028:    /* LINE SEPARATOR */  
       case 0x2029:    /* PARAGRAPH SEPARATOR */  
       MRRETURN(MATCH_NOMATCH);  
2588        }        }
2589      ecode++;      ecode++;
2590      break;      break;
# Line 2129  for (;;) Line 2593  for (;;)
2593      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2594        {        {
2595        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2596        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2597        }        }
2598      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2599      switch(c)      switch(c)
2600        {        {
2601        default: MRRETURN(MATCH_NOMATCH);        VSPACE_CASES: break;
2602        case 0x0a:      /* LF */        default: RRETURN(MATCH_NOMATCH);
       case 0x0b:      /* VT */  
       case 0x0c:      /* FF */  
       case 0x0d:      /* CR */  
       case 0x85:      /* NEL */  
       case 0x2028:    /* LINE SEPARATOR */  
       case 0x2029:    /* PARAGRAPH SEPARATOR */  
       break;  
2603        }        }
2604      ecode++;      ecode++;
2605      break;      break;
# Line 2156  for (;;) Line 2613  for (;;)
2613      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2614        {        {
2615        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2616        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2617        }        }
2618      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2619        {        {
2620          const pcre_uint32 *cp;
2621        const ucd_record *prop = GET_UCD(c);        const ucd_record *prop = GET_UCD(c);
2622    
2623        switch(ecode[1])        switch(ecode[1])
2624          {          {
2625          case PT_ANY:          case PT_ANY:
2626          if (op == OP_NOTPROP) MRRETURN(MATCH_NOMATCH);          if (op == OP_NOTPROP) RRETURN(MATCH_NOMATCH);
2627          break;          break;
2628    
2629          case PT_LAMP:          case PT_LAMP:
2630          if ((prop->chartype == ucp_Lu ||          if ((prop->chartype == ucp_Lu ||
2631               prop->chartype == ucp_Ll ||               prop->chartype == ucp_Ll ||
2632               prop->chartype == ucp_Lt) == (op == OP_NOTPROP))               prop->chartype == ucp_Lt) == (op == OP_NOTPROP))
2633            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2634          break;          break;
2635    
2636          case PT_GC:          case PT_GC:
2637          if ((ecode[2] != _pcre_ucp_gentype[prop->chartype]) == (op == OP_PROP))          if ((ecode[2] != PRIV(ucp_gentype)[prop->chartype]) == (op == OP_PROP))
2638            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2639          break;          break;
2640    
2641          case PT_PC:          case PT_PC:
2642          if ((ecode[2] != prop->chartype) == (op == OP_PROP))          if ((ecode[2] != prop->chartype) == (op == OP_PROP))
2643            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2644          break;          break;
2645    
2646          case PT_SC:          case PT_SC:
2647          if ((ecode[2] != prop->script) == (op == OP_PROP))          if ((ecode[2] != prop->script) == (op == OP_PROP))
2648            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2649          break;          break;
2650    
2651          /* These are specials */          /* These are specials */
2652    
2653          case PT_ALNUM:          case PT_ALNUM:
2654          if ((_pcre_ucp_gentype[prop->chartype] == ucp_L ||          if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2655               _pcre_ucp_gentype[prop->chartype] == ucp_N) == (op == OP_NOTPROP))               PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (op == OP_NOTPROP))
2656            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2657          break;          break;
2658    
2659          case PT_SPACE:    /* Perl space */          case PT_SPACE:    /* Perl space */
2660          if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z ||          if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2661               c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)               c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
2662                 == (op == OP_NOTPROP))                 == (op == OP_NOTPROP))
2663            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2664          break;          break;
2665    
2666          case PT_PXSPACE:  /* POSIX space */          case PT_PXSPACE:  /* POSIX space */
2667          if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z ||          if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2668               c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||               c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
2669               c == CHAR_FF || c == CHAR_CR)               c == CHAR_FF || c == CHAR_CR)
2670                 == (op == OP_NOTPROP))                 == (op == OP_NOTPROP))
2671            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2672          break;          break;
2673    
2674          case PT_WORD:          case PT_WORD:
2675          if ((_pcre_ucp_gentype[prop->chartype] == ucp_L ||          if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2676               _pcre_ucp_gentype[prop->chartype] == ucp_N ||               PRIV(ucp_gentype)[prop->chartype] == ucp_N ||
2677               c == CHAR_UNDERSCORE) == (op == OP_NOTPROP))               c == CHAR_UNDERSCORE) == (op == OP_NOTPROP))
2678            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2679            break;
2680    
2681            case PT_CLIST:
2682            cp = PRIV(ucd_caseless_sets) + ecode[2];
2683            for (;;)
2684              {
2685              if (c < *cp)
2686                { if (op == OP_PROP) { RRETURN(MATCH_NOMATCH); } else break; }
2687              if (c == *cp++)
2688                { if (op == OP_PROP) break; else { RRETURN(MATCH_NOMATCH); } }
2689              }
2690            break;
2691    
2692            case PT_UCNC:
2693            if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
2694                 c == CHAR_GRAVE_ACCENT || (c >= 0xa0 && c <= 0xd7ff) ||
2695                 c >= 0xe000) == (op == OP_NOTPROP))
2696              RRETURN(MATCH_NOMATCH);
2697          break;          break;
2698    
2699          /* This should never occur */          /* This should never occur */
# Line 2237  for (;;) Line 2713  for (;;)
2713      if (eptr >= md->end_subject)      if (eptr >= md->end_subject)
2714        {        {
2715        SCHECK_PARTIAL();        SCHECK_PARTIAL();
2716        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2717        }        }
2718      GETCHARINCTEST(c, eptr);      else
2719        {        {
2720        int category = UCD_CATEGORY(c);        int lgb, rgb;
2721        if (category == ucp_M) MRRETURN(MATCH_NOMATCH);        GETCHARINCTEST(c, eptr);
2722          lgb = UCD_GRAPHBREAK(c);
2723        while (eptr < md->end_subject)        while (eptr < md->end_subject)
2724          {          {
2725          int len = 1;          int len = 1;
2726          if (!utf8) c = *eptr; else          if (!utf) c = *eptr; else { GETCHARLEN(c, eptr, len); }
2727            {          rgb = UCD_GRAPHBREAK(c);
2728            GETCHARLEN(c, eptr, len);          if ((PRIV(ucp_gbtable)[lgb] & (1 << rgb)) == 0) break;
2729            }          lgb = rgb;
         category = UCD_CATEGORY(c);  
         if (category != ucp_M) break;  
2730          eptr += len;          eptr += len;
2731          }          }
2732        }        }
2733        CHECK_PARTIAL();
2734      ecode++;      ecode++;
2735      break;      break;
2736  #endif  #endif  /* SUPPORT_UCP */
2737    
2738    
2739      /* Match a back reference, possibly repeatedly. Look past the end of the      /* Match a back reference, possibly repeatedly. Look past the end of the
# Line 2269  for (;;) Line 2745  for (;;)
2745      loops). */      loops). */
2746    
2747      case OP_REF:      case OP_REF:
2748        case OP_REFI:
2749        caseless = op == OP_REFI;
2750      offset = GET2(ecode, 1) << 1;               /* Doubled ref number */      offset = GET2(ecode, 1) << 1;               /* Doubled ref number */
2751      ecode += 3;      ecode += 1 + IMM2_SIZE;
2752    
2753      /* If the reference is unset, there are two possibilities:      /* If the reference is unset, there are two possibilities:
2754    
# Line 2310  for (;;) Line 2788  for (;;)
2788        case OP_CRMINRANGE:        case OP_CRMINRANGE:
2789        minimize = (*ecode == OP_CRMINRANGE);        minimize = (*ecode == OP_CRMINRANGE);
2790        min = GET2(ecode, 1);        min = GET2(ecode, 1);
2791        max = GET2(ecode, 3);        max = GET2(ecode, 1 + IMM2_SIZE);
2792        if (max == 0) max = INT_MAX;        if (max == 0) max = INT_MAX;
2793        ecode += 5;        ecode += 1 + 2 * IMM2_SIZE;
2794        break;        break;
2795    
2796        default:               /* No repeat follows */        default:               /* No repeat follows */
2797        if ((length = match_ref(offset, eptr, length, md, ims)) < 0)        if ((length = match_ref(offset, eptr, length, md, caseless)) < 0)
2798          {          {
2799            if (length == -2) eptr = md->end_subject;   /* Partial match */
2800          CHECK_PARTIAL();          CHECK_PARTIAL();
2801          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
2802          }          }
2803        eptr += length;        eptr += length;
2804        continue;              /* With the main loop */        continue;              /* With the main loop */
2805        }        }
2806    
2807      /* Handle repeated back references. If the length of the reference is      /* Handle repeated back references. If the length of the reference is
2808      zero, just continue with the main loop. */      zero, just continue with the main loop. If the length is negative, it
2809        means the reference is unset in non-Java-compatible mode. If the minimum is
2810        zero, we can continue at the same level without recursion. For any other
2811        minimum, carrying on will result in NOMATCH. */
2812    
2813      if (length == 0) continue;      if (length == 0) continue;
2814        if (length < 0 && min == 0) continue;
2815    
2816      /* First, ensure the minimum number of matches are present. We get back      /* First, ensure the minimum number of matches are present. We get back
2817      the length of the reference string explicitly rather than passing the      the length of the reference string explicitly rather than passing the
# Line 2336  for (;;) Line 2819  for (;;)
2819    
2820      for (i = 1; i <= min; i++)      for (i = 1; i <= min; i++)
2821        {        {
2822        int slength;        int slength;
2823        if ((slength = match_ref(offset, eptr, length, md, ims)) < 0)        if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
2824          {          {
2825            if (slength == -2) eptr = md->end_subject;   /* Partial match */
2826          CHECK_PARTIAL();          CHECK_PARTIAL();
2827          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
2828          }          }
2829        eptr += slength;        eptr += slength;
2830        }        }
# Line 2356  for (;;) Line 2840  for (;;)
2840        {        {
2841        for (fi = min;; fi++)        for (fi = min;; fi++)
2842          {          {
2843          int slength;          int slength;
2844          RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM14);          RMATCH(eptr, ecode, offset_top, md, eptrb, RM14);
2845          if (rrc != MATCH_NOMATCH) RRETURN(rrc);          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2846          if (fi >= max) MRRETURN(MATCH_NOMATCH);          if (fi >= max) RRETURN(MATCH_NOMATCH);
2847          if ((slength = match_ref(offset, eptr, length, md, ims)) < 0)          if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
2848            {            {
2849              if (slength == -2) eptr = md->end_subject;   /* Partial match */
2850            CHECK_PARTIAL();            CHECK_PARTIAL();
2851            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
2852            }            }
2853          eptr += slength;          eptr += slength;
2854          }          }
# Line 2377  for (;;) Line 2862  for (;;)
2862        pp = eptr;        pp = eptr;
2863        for (i = min; i < max; i++)        for (i = min; i < max; i++)
2864          {          {
2865          int slength;          int slength;
2866          if ((slength = match_ref(offset, eptr, length, md, ims)) < 0)          if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
2867            {            {
2868            CHECK_PARTIAL();            /* Can't use CHECK_PARTIAL because we don't want to update eptr in
2869              the soft partial matching case. */
2870    
2871              if (slength == -2 && md->partial != 0 &&
2872                  md->end_subject > md->start_used_ptr)
2873                {
2874                md->hitend = TRUE;
2875                if (md->partial > 1) RRETURN(PCRE_ERROR_PARTIAL);
2876                }
2877            break;            break;
2878            }            }
2879          eptr += slength;          eptr += slength;
2880          }          }
2881    
2882        while (eptr >= pp)        while (eptr >= pp)
2883          {          {
2884          RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM15);          RMATCH(eptr, ecode, offset_top, md, eptrb, RM15);
2885          if (rrc != MATCH_NOMATCH) RRETURN(rrc);          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2886          eptr -= length;          eptr -= length;
2887          }          }
2888        MRRETURN(MATCH_NOMATCH);        RRETURN(MATCH_NOMATCH);
2889        }        }
2890      /* Control never gets here */      /* Control never gets here */
2891    
# Line 2409  for (;;) Line 2903  for (;;)
2903      case OP_NCLASS:      case OP_NCLASS:
2904      case OP_CLASS:      case OP_CLASS:
2905        {        {
2906          /* The data variable is saved across frames, so the byte map needs to
2907          be stored there. */
2908    #define BYTE_MAP ((pcre_uint8 *)data)
2909        data = ecode + 1;                /* Save for matching */        data = ecode + 1;                /* Save for matching */
2910        ecode += 33;                     /* Advance past the item */        ecode += 1 + (32 / sizeof(pcre_uchar)); /* Advance past the item */
2911    
2912        switch (*ecode)        switch (*ecode)
2913          {          {
# Line 2431  for (;;) Line 2928  for (;;)
2928          case OP_CRMINRANGE:          case OP_CRMINRANGE:
2929          minimize = (*ecode == OP_CRMINRANGE);          minimize = (*ecode == OP_CRMINRANGE);
2930          min = GET2(ecode, 1);          min = GET2(ecode, 1);
2931          max = GET2(ecode, 3);          max = GET2(ecode, 1 + IMM2_SIZE);
2932          if (max == 0) max = INT_MAX;          if (max == 0) max = INT_MAX;
2933          ecode += 5;          ecode += 1 + 2 * IMM2_SIZE;
2934          break;          break;
2935    
2936          default:               /* No repeat follows */          default:               /* No repeat follows */
# Line 2443  for (;;) Line 2940  for (;;)
2940    
2941        /* First, ensure the minimum number of matches are present. */        /* First, ensure the minimum number of matches are present. */
2942    
2943  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2944        /* UTF-8 mode */        if (utf)
       if (utf8)  
2945          {          {
2946          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
2947            {            {
2948            if (eptr >= md->end_subject)            if (eptr >= md->end_subject)
2949              {              {
2950              SCHECK_PARTIAL();              SCHECK_PARTIAL();
2951              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
2952              }              }
2953            GETCHARINC(c, eptr);            GETCHARINC(c, eptr);
2954            if (c > 255)            if (c > 255)
2955              {              {
2956              if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);              if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
2957              }              }
2958            else            else
2959              {              if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
             if ((data[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);  
             }  
2960            }            }
2961          }          }
2962        else        else
2963  #endif  #endif
2964        /* Not UTF-8 mode */        /* Not UTF mode */
2965          {          {
2966          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
2967            {            {
2968            if (eptr >= md->end_subject)            if (eptr >= md->end_subject)
2969              {              {
2970              SCHECK_PARTIAL();              SCHECK_PARTIAL();
2971              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
2972              }              }
2973            c = *eptr++;            c = *eptr++;
2974            if ((data[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);  #ifndef COMPILE_PCRE8
2975              if (c > 255)
2976                {
2977                if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
2978                }
2979              else
2980    #endif
2981                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
2982            }            }
2983          }          }
2984    
# Line 2491  for (;;) Line 2992  for (;;)
2992    
2993        if (minimize)        if (minimize)
2994          {          {
2995  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2996          /* UTF-8 mode */          if (utf)
         if (utf8)  
2997            {            {
2998            for (fi = min;; fi++)            for (fi = min;; fi++)
2999              {              {
3000              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM16);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM16);
3001              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3002              if (fi >= max) MRRETURN(MATCH_NOMATCH);              if (fi >= max) RRETURN(MATCH_NOMATCH);
3003              if (eptr >= md->end_subject)              if (eptr >= md->end_subject)
3004                {                {
3005                SCHECK_PARTIAL();                SCHECK_PARTIAL();
3006                MRRETURN(MATCH_NOMATCH);                RRETURN(MATCH_NOMATCH);
3007                }                }
3008              GETCHARINC(c, eptr);              GETCHARINC(c, eptr);
3009              if (c > 255)              if (c > 255)
3010                {                {
3011                if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);                if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
3012                }                }
3013              else              else
3014                {                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
               if ((data[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);  
               }  
3015              }              }
3016            }            }
3017          else          else
3018  #endif  #endif
3019          /* Not UTF-8 mode */          /* Not UTF mode */
3020            {            {
3021            for (fi = min;; fi++)            for (fi = min;; fi++)
3022              {              {
3023              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM17);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM17);
3024              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3025              if (fi >= max) MRRETURN(MATCH_NOMATCH);              if (fi >= max) RRETURN(MATCH_NOMATCH);
3026              if (eptr >= md->end_subject)              if (eptr >= md->end_subject)
3027                {                {
3028                SCHECK_PARTIAL();                SCHECK_PARTIAL();
3029                MRRETURN(MATCH_NOMATCH);                RRETURN(MATCH_NOMATCH);
3030                }                }
3031              c = *eptr++;              c = *eptr++;
3032              if ((data[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);  #ifndef COMPILE_PCRE8
3033                if (c > 255)
3034                  {
3035                  if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);
3036                  }
3037                else
3038    #endif
3039                  if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);
3040              }              }
3041            }            }
3042          /* Control never gets here */          /* Control never gets here */
# Line 2543  for (;;) Line 3048  for (;;)
3048          {          {
3049          pp = eptr;          pp = eptr;
3050    
3051  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
3052          /* UTF-8 mode */          if (utf)
         if (utf8)  
3053            {            {
3054            for (i = min; i < max; i++)            for (i = min; i < max; i++)
3055              {              {
# Line 2561  for (;;) Line 3065  for (;;)
3065                if (op == OP_CLASS) break;                if (op == OP_CLASS) break;
3066                }                }
3067              else              else
3068                {                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) break;
               if ((data[c/8] & (1 << (c&7))) == 0) break;  
               }  
3069              eptr += len;              eptr += len;
3070              }              }
3071            for (;;)            for (;;)
3072              {              {
3073              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM18);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM18);
3074              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3075              if (eptr-- == pp) break;        /* Stop if tried at original pos */              if (eptr-- == pp) break;        /* Stop if tried at original pos */
3076              BACKCHAR(eptr);              BACKCHAR(eptr);
# Line 2576  for (;;) Line 3078  for (;;)
3078            }            }
3079          else          else
3080  #endif  #endif
3081            /* Not UTF-8 mode */            /* Not UTF mode */
3082            {            {
3083            for (i = min; i < max; i++)            for (i = min; i < max; i++)
3084              {              {
# Line 2586  for (;;) Line 3088  for (;;)
3088                break;                break;
3089                }                }
3090              c = *eptr;              c = *eptr;
3091              if ((data[c/8] & (1 << (c&7))) == 0) break;  #ifndef COMPILE_PCRE8
3092                if (c > 255)
3093                  {
3094                  if (op == OP_CLASS) break;
3095                  }
3096                else
3097    #endif
3098                  if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) break;
3099              eptr++;              eptr++;
3100              }              }
3101            while (eptr >= pp)            while (eptr >= pp)
3102              {              {
3103              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM19);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM19);
3104              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3105              eptr--;              eptr--;
3106              }              }
3107            }            }
3108    
3109          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
3110          }          }
3111    #undef BYTE_MAP
3112        }        }
3113      /* Control never gets here */      /* Control never gets here */
3114    
# Line 2607  for (;;) Line 3117  for (;;)
3117      when UTF-8 mode mode is supported. Nevertheless, we may not be in UTF-8      when UTF-8 mode mode is supported. Nevertheless, we may not be in UTF-8
3118      mode, because Unicode properties are supported in non-UTF-8 mode. */      mode, because Unicode properties are supported in non-UTF-8 mode. */
3119    
3120  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
3121      case OP_XCLASS:      case OP_XCLASS:
3122        {        {
3123        data = ecode + 1 + LINK_SIZE;                /* Save for matching */        data = ecode + 1 + LINK_SIZE;                /* Save for matching */
# Line 2632  for (;;) Line 3142  for (;;)
3142          case OP_CRMINRANGE:          case OP_CRMINRANGE:
3143          minimize = (*ecode == OP_CRMINRANGE);          minimize = (*ecode == OP_CRMINRANGE);
3144          min = GET2(ecode, 1);          min = GET2(ecode, 1);
3145          max = GET2(ecode, 3);          max = GET2(ecode, 1 + IMM2_SIZE);
3146          if (max == 0) max = INT_MAX;          if (max == 0) max = INT_MAX;
3147          ecode += 5;          ecode += 1 + 2 * IMM2_SIZE;
3148          break;          break;
3149    
3150          default:               /* No repeat follows */          default:               /* No repeat follows */
# Line 2649  for (;;) Line 3159  for (;;)
3159          if (eptr >= md->end_subject)          if (eptr >= md->end_subject)
3160            {            {
3161            SCHECK_PARTIAL();            SCHECK_PARTIAL();
3162            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
3163            }            }
3164          GETCHARINCTEST(c, eptr);          GETCHARINCTEST(c, eptr);
3165          if (!_pcre_xclass(c, data)) MRRETURN(MATCH_NOMATCH);          if (!PRIV(xclass)(c, data, utf)) RRETURN(MATCH_NOMATCH);
3166          }          }
3167    
3168        /* If max == min we can continue with the main loop without the        /* If max == min we can continue with the main loop without the
# Line 2667  for (;;) Line 3177  for (;;)
3177          {          {
3178          for (fi = min;; fi++)          for (fi = min;; fi++)
3179            {            {
3180            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM20);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM20);
3181            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3182            if (fi >= max) MRRETURN(MATCH_NOMATCH);            if (fi >= max) RRETURN(MATCH_NOMATCH);
3183            if (eptr >= md->end_subject)            if (eptr >= md->end_subject)
3184              {              {
3185              SCHECK_PARTIAL();              SCHECK_PARTIAL();
3186              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
3187              }              }
3188            GETCHARINCTEST(c, eptr);            GETCHARINCTEST(c, eptr);
3189            if (!_pcre_xclass(c, data)) MRRETURN(MATCH_NOMATCH);            if (!PRIV(xclass)(c, data, utf)) RRETURN(MATCH_NOMATCH);
3190            }            }
3191          /* Control never gets here */          /* Control never gets here */
3192          }          }
# Line 2694  for (;;) Line 3204  for (;;)
3204              SCHECK_PARTIAL();              SCHECK_PARTIAL();
3205              break;              break;
3206              }              }
3207    #ifdef SUPPORT_UTF
3208            GETCHARLENTEST(c, eptr, len);            GETCHARLENTEST(c, eptr, len);
3209            if (!_pcre_xclass(c, data)) break;  #else
3210              c = *eptr;
3211    #endif
3212              if (!PRIV(xclass)(c, data, utf)) break;
3213            eptr += len;            eptr += len;
3214            }            }
3215          for(;;)          for(;;)
3216            {            {
3217            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM21);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM21);
3218            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3219            if (eptr-- == pp) break;        /* Stop if tried at original pos */            if (eptr-- == pp) break;        /* Stop if tried at original pos */
3220            if (utf8) BACKCHAR(eptr);  #ifdef SUPPORT_UTF
3221              if (utf) BACKCHAR(eptr);
3222    #endif
3223            }            }
3224          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
3225          }          }
3226    
3227        /* Control never gets here */        /* Control never gets here */
# Line 2715  for (;;) Line 3231  for (;;)
3231      /* Match a single character, casefully */      /* Match a single character, casefully */
3232    
3233      case OP_CHAR:      case OP_CHAR:
3234  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
3235      if (utf8)      if (utf)
3236        {        {
3237        length = 1;        length = 1;
3238        ecode++;        ecode++;
# Line 2724  for (;;) Line 3240  for (;;)
3240        if (length > md->end_subject - eptr)        if (length > md->end_subject - eptr)
3241          {          {
3242          CHECK_PARTIAL();             /* Not SCHECK_PARTIAL() */          CHECK_PARTIAL();             /* Not SCHECK_PARTIAL() */
3243          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
3244          }          }
3245        while (length-- > 0) if (*ecode++ != *eptr++) MRRETURN(MATCH_NOMATCH);        while (length-- > 0) if (*ecode++ != RAWUCHARINC(eptr)) RRETURN(MATCH_NOMATCH);
3246        }        }
3247      else      else
3248  #endif  #endif
3249        /* Not UTF mode */
     /* Non-UTF-8 mode */  
3250        {        {
3251        if (md->end_subject - eptr < 1)        if (md->end_subject - eptr < 1)
3252          {          {
3253          SCHECK_PARTIAL();            /* This one can use SCHECK_PARTIAL() */          SCHECK_PARTIAL();            /* This one can use SCHECK_PARTIAL() */
3254          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
3255          }          }
3256        if (ecode[1] != *eptr++) MRRETURN(MATCH_NOMATCH);        if (ecode[1] != *eptr++) RRETURN(MATCH_NOMATCH);
3257        ecode += 2;        ecode += 2;
3258        }        }
3259      break;      break;
3260    
3261      /* Match a single character, caselessly */      /* Match a single character, caselessly. If we are at the end of the
3262        subject, give up immediately. */
3263    
3264        case OP_CHARI:
3265        if (eptr >= md->end_subject)
3266          {
3267          SCHECK_PARTIAL();
3268          RRETURN(MATCH_NOMATCH);
3269          }
3270    
3271      case OP_CHARNC:  #ifdef SUPPORT_UTF
3272  #ifdef SUPPORT_UTF8      if (utf)
     if (utf8)  
3273        {        {
3274        length = 1;        length = 1;
3275        ecode++;        ecode++;
3276        GETCHARLEN(fc, ecode, length);        GETCHARLEN(fc, ecode, length);
3277    
       if (length > md->end_subject - eptr)  
         {  
         CHECK_PARTIAL();             /* Not SCHECK_PARTIAL() */  
         MRRETURN(MATCH_NOMATCH);  
         }  
   
3278        /* If the pattern character's value is < 128, we have only one byte, and        /* If the pattern character's value is < 128, we have only one byte, and
3279        can use the fast lookup table. */        we know that its other case must also be one byte long, so we can use the
3280          fast lookup table. We know that there is at least one byte left in the
3281          subject. */
3282    
3283        if (fc < 128)        if (fc < 128)
3284          {          {
3285          if (md->lcc[*ecode++] != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);          pcre_uint32 cc = RAWUCHAR(eptr);
3286            if (md->lcc[fc] != TABLE_GET(cc, md->lcc, cc)) RRETURN(MATCH_NOMATCH);
3287            ecode++;
3288            eptr++;
3289          }          }
3290    
3291        /* Otherwise we must pick up the subject character */        /* Otherwise we must pick up the subject character. Note that we cannot
3292          use the value of "length" to check for sufficient bytes left, because the
3293          other case of the character may have more or fewer bytes.  */
3294    
3295        else        else
3296          {          {
3297          unsigned int dc;          pcre_uint32 dc;
3298          GETCHARINC(dc, eptr);          GETCHARINC(dc, eptr);
3299          ecode += length;          ecode += length;
3300    
# Line 2783  for (;;) Line 3306  for (;;)
3306  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3307            if (dc != UCD_OTHERCASE(fc))            if (dc != UCD_OTHERCASE(fc))
3308  #endif  #endif
3309              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
3310            }            }
3311          }          }
3312        }        }
3313      else      else
3314  #endif   /* SUPPORT_UTF8 */  #endif   /* SUPPORT_UTF */
3315    
3316      /* Non-UTF-8 mode */      /* Not UTF mode */
3317        {        {
3318        if (md->end_subject - eptr < 1)        if (TABLE_GET(ecode[1], md->lcc, ecode[1])
3319          {            != TABLE_GET(*eptr, md->lcc, *eptr)) RRETURN(MATCH_NOMATCH);
3320          SCHECK_PARTIAL();            /* This one can use SCHECK_PARTIAL() */        eptr++;
         MRRETURN(MATCH_NOMATCH);  
         }  
       if (md->lcc[ecode[1]] != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);  
3321        ecode += 2;        ecode += 2;
3322        }        }
3323      break;      break;
# Line 2805  for (;;) Line 3325  for (;;)
3325      /* Match a single character repeatedly. */      /* Match a single character repeatedly. */
3326    
3327      case OP_EXACT:      case OP_EXACT:
3328        case OP_EXACTI:
3329      min = max = GET2(ecode, 1);      min = max = GET2(ecode, 1);
3330      ecode += 3;      ecode += 1 + IMM2_SIZE;
3331      goto REPEATCHAR;      goto REPEATCHAR;
3332    
3333      case OP_POSUPTO:      case OP_POSUPTO:
3334        case OP_POSUPTOI:
3335      possessive = TRUE;      possessive = TRUE;
3336      /* Fall through */      /* Fall through */
3337    
3338      case OP_UPTO:      case OP_UPTO:
3339        case OP_UPTOI:
3340      case OP_MINUPTO:      case OP_MINUPTO:
3341        case OP_MINUPTOI:
3342      min = 0;      min = 0;
3343      max = GET2(ecode, 1);      max = GET2(ecode, 1);
3344      minimize = *ecode == OP_MINUPTO;      minimize = *ecode == OP_MINUPTO || *ecode == OP_MINUPTOI;
3345      ecode += 3;      ecode += 1 + IMM2_SIZE;
3346      goto REPEATCHAR;      goto REPEATCHAR;
3347    
3348      case OP_POSSTAR:      case OP_POSSTAR:
3349        case OP_POSSTARI:
3350      possessive = TRUE;      possessive = TRUE;
3351      min = 0;      min = 0;
3352      max = INT_MAX;      max = INT_MAX;
# Line 2829  for (;;) Line 3354  for (;;)
3354      goto REPEATCHAR;      goto REPEATCHAR;
3355    
3356      case OP_POSPLUS:      case OP_POSPLUS:
3357        case OP_POSPLUSI:
3358      possessive = TRUE;      possessive = TRUE;
3359      min = 1;      min = 1;
3360      max = INT_MAX;      max = INT_MAX;
# Line 2836  for (;;) Line 3362  for (;;)
3362      goto REPEATCHAR;      goto REPEATCHAR;
3363    
3364      case OP_POSQUERY:      case OP_POSQUERY:
3365        case OP_POSQUERYI:
3366      possessive = TRUE;      possessive = TRUE;
3367      min = 0;      min = 0;
3368      max = 1;      max = 1;
# Line 2843  for (;;) Line 3370  for (;;)
3370      goto REPEATCHAR;      goto REPEATCHAR;
3371    
3372      case OP_STAR:      case OP_STAR:
3373        case OP_STARI:
3374      case OP_MINSTAR:      case OP_MINSTAR:
3375        case OP_MINSTARI:
3376      case OP_PLUS:      case OP_PLUS:
3377        case OP_PLUSI:
3378      case OP_MINPLUS:      case OP_MINPLUS:
3379        case OP_MINPLUSI:
3380      case OP_QUERY:      case OP_QUERY:
3381        case OP_QUERYI:
3382      case OP_MINQUERY:      case OP_MINQUERY:
3383      c = *ecode++ - OP_STAR;      case OP_MINQUERYI:
3384        c = *ecode++ - ((op < OP_STARI)? OP_STAR : OP_STARI);
3385      minimize = (c & 1) != 0;      minimize = (c & 1) != 0;
   
3386      min = rep_min[c];                 /* Pick up values from tables; */      min = rep_min[c];                 /* Pick up values from tables; */
3387      max = rep_max[c];                 /* zero for max => infinity */      max = rep_max[c];                 /* zero for max => infinity */
3388      if (max == 0) max = INT_MAX;      if (max == 0) max = INT_MAX;
3389    
3390      /* Common code for all repeated single-character matches. */      /* Common code for all repeated single-character matches. We first check
3391        for the minimum number of characters. If the minimum equals the maximum, we
3392        are done. Otherwise, if minimizing, check the rest of the pattern for a
3393        match; if there isn't one, advance up to the maximum, one character at a
3394        time.
3395    
3396        If maximizing, advance up to the maximum number of matching characters,
3397        until eptr is past the end of the maximum run. If possessive, we are
3398        then done (no backing up). Otherwise, match at this position; anything
3399        other than no match is immediately returned. For nomatch, back up one
3400        character, unless we are matching \R and the last thing matched was
3401        \r\n, in which case, back up two bytes. When we reach the first optional
3402        character position, we can save stack by doing a tail recurse.
3403    
3404        The various UTF/non-UTF and caseful/caseless cases are handled separately,
3405        for speed. */
3406    
3407      REPEATCHAR:      REPEATCHAR:
3408  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
3409      if (utf8)      if (utf)
3410        {        {
3411        length = 1;        length = 1;
3412        charptr = ecode;        charptr = ecode;
# Line 2872  for (;;) Line 3419  for (;;)
3419        if (length > 1)        if (length > 1)
3420          {          {
3421  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3422          unsigned int othercase;          pcre_uint32 othercase;
3423          if ((ims & PCRE_CASELESS) != 0 &&          if (op >= OP_STARI &&     /* Caseless */
3424              (othercase = UCD_OTHERCASE(fc)) != fc)              (othercase = UCD_OTHERCASE(fc)) != fc)
3425            oclength = _pcre_ord2utf8(othercase, occhars);            oclength = PRIV(ord2utf)(othercase, occhars);
3426          else oclength = 0;          else oclength = 0;
3427  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3428    
3429          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
3430            {            {
3431            if (eptr <= md->end_subject - length &&            if (eptr <= md->end_subject - length &&
3432              memcmp(eptr, charptr, length) == 0) eptr += length;              memcmp(eptr, charptr, IN_UCHARS(length)) == 0) eptr += length;
3433  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3434            else if (oclength > 0 &&            else if (oclength > 0 &&
3435                     eptr <= md->end_subject - oclength &&                     eptr <= md->end_subject - oclength &&
3436                     memcmp(eptr, occhars, oclength) == 0) eptr += oclength;                     memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3437  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3438            else            else
3439              {              {
3440              CHECK_PARTIAL();              CHECK_PARTIAL();
3441              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
3442              }              }
3443            }            }
3444    
# Line 2901  for (;;) Line 3448  for (;;)
3448            {            {
3449            for (fi = min;; fi++)            for (fi = min;; fi++)
3450              {              {
3451              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM22);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM22);
3452              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3453              if (fi >= max) MRRETURN(MATCH_NOMATCH);              if (fi >= max) RRETURN(MATCH_NOMATCH);
3454              if (eptr <= md->end_subject - length &&              if (eptr <= md->end_subject - length &&
3455                memcmp(eptr, charptr, length) == 0) eptr += length;                memcmp(eptr, charptr, IN_UCHARS(length)) == 0) eptr += length;
3456  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3457              else if (oclength > 0 &&              else if (oclength > 0 &&
3458                       eptr <= md->end_subject - oclength &&                       eptr <= md->end_subject - oclength &&
3459                       memcmp(eptr, occhars, oclength) == 0) eptr += oclength;                       memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3460  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3461              else              else
3462                {                {
3463                CHECK_PARTIAL();                CHECK_PARTIAL();
3464                MRRETURN(MATCH_NOMATCH);                RRETURN(MATCH_NOMATCH);
3465                }                }
3466              }              }
3467            /* Control never gets here */            /* Control never gets here */
# Line 2926  for (;;) Line 3473  for (;;)
3473            for (i = min; i < max; i++)            for (i = min; i < max; i++)
3474              {              {
3475              if (eptr <= md->end_subject - length &&              if (eptr <= md->end_subject - length &&
3476                  memcmp(eptr, charptr, length) == 0) eptr += length;                  memcmp(eptr, charptr, IN_UCHARS(length)) == 0) eptr += length;
3477  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3478              else if (oclength > 0 &&              else if (oclength > 0 &&
3479                       eptr <= md->end_subject - oclength &&                       eptr <= md->end_subject - oclength &&
3480                       memcmp(eptr, occhars, oclength) == 0) eptr += oclength;                       memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3481  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3482              else              else
3483                {                {
# Line 2939  for (;;) Line 3486  for (;;)
3486                }                }
3487              }              }
3488    
3489            if (possessive) continue;            if (possessive) continue;    /* No backtracking */
   
3490            for(;;)            for(;;)
3491              {              {
3492              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM23);              if (eptr == pp) goto TAIL_RECURSE;
3493                RMATCH(eptr, ecode, offset_top, md, eptrb, RM23);
3494              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
             if (eptr == pp) { MRRETURN(MATCH_NOMATCH); }  
3495  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3496              eptr--;              eptr--;
3497              BACKCHAR(eptr);              BACKCHAR(eptr);
# Line 2962  for (;;) Line 3508  for (;;)
3508        value of fc will always be < 128. */        value of fc will always be < 128. */
3509        }        }
3510      else      else
3511  #endif  /* SUPPORT_UTF8 */  #endif  /* SUPPORT_UTF */
3512          /* When not in UTF-8 mode, load a single-byte character. */
3513          fc = *ecode++;
3514    
3515      /* When not in UTF-8 mode, load a single-byte character. */      /* The value of fc at this point is always one character, though we may
3516        or may not be in UTF mode. The code is duplicated for the caseless and
     fc = *ecode++;  
   
     /* The value of fc at this point is always less than 256, though we may or  
     may not be in UTF-8 mode. The code is duplicated for the caseless and  
3517      caseful cases, for speed, since matching characters is likely to be quite      caseful cases, for speed, since matching characters is likely to be quite
3518      common. First, ensure the minimum number of matches are present. If min =      common. First, ensure the minimum number of matches are present. If min =
3519      max, continue at the same level without recursing. Otherwise, if      max, continue at the same level without recursing. Otherwise, if
# Line 2978  for (;;) Line 3522  for (;;)
3522      maximizing, find the maximum number of characters and work backwards. */      maximizing, find the maximum number of characters and work backwards. */
3523    
3524      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,
3525        max, eptr));        max, (char *)eptr));
3526    
3527      if ((ims & PCRE_CASELESS) != 0)      if (op >= OP_STARI)  /* Caseless */
3528        {        {
3529        fc = md->lcc[fc];  #ifdef COMPILE_PCRE8
3530          /* fc must be < 128 if UTF is enabled. */
3531          foc = md->fcc[fc];
3532    #else
3533    #ifdef SUPPORT_UTF
3534    #ifdef SUPPORT_UCP
3535          if (utf && fc > 127)
3536            foc = UCD_OTHERCASE(fc);
3537    #else
3538          if (utf && fc > 127)
3539            foc = fc;
3540    #endif /* SUPPORT_UCP */
3541          else
3542    #endif /* SUPPORT_UTF */
3543            foc = TABLE_GET(fc, md->fcc, fc);
3544    #endif /* COMPILE_PCRE8 */
3545    
3546        for (i = 1; i <= min; i++)        for (i = 1; i <= min; i++)
3547          {          {
3548            pcre_uint32 cc;                 /* Faster than pcre_uchar */
3549          if (eptr >= md->end_subject)          if (eptr >= md->end_subject)
3550            {            {
3551            SCHECK_PARTIAL();            SCHECK_PARTIAL();
3552            MRRETURN(MATCH_NOMATCH);            RRETURN(MATCH_NOMATCH);
3553            }            }
3554          if (fc != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);          cc = RAWUCHARTEST(eptr);
3555            if (fc != cc && foc != cc) RRETURN(MATCH_NOMATCH);
3556            eptr++;
3557          }          }
3558        if (min == max) continue;        if (min == max) continue;
3559        if (minimize)        if (minimize)
3560          {          {
3561          for (fi = min;; fi++)          for (fi = min;; fi++)
3562            {            {
3563            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM24);            pcre_uint32 cc;               /* Faster than pcre_uchar */
3564              RMATCH(eptr, ecode, offset_top, md, eptrb, RM24);
3565            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3566            if (fi >= max) MRRETURN(MATCH_NOMATCH);            if (fi >= max) RRETURN(MATCH_NOMATCH);
3567            if (eptr >= md->end_subject)            if (eptr >= md->end_subject)
3568              {              {
3569              SCHECK_PARTIAL();              SCHECK_PARTIAL();
3570              MRRETURN(MATCH_NOMATCH);              RRETURN(MATCH_NOMATCH);
3571              }              }
3572            if (fc != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);            cc = RAWUCHARTEST(eptr);
3573              if (fc != cc && foc != cc) RRETURN(MATCH_NOMATCH);
3574              eptr++;
3575            }            }
3576          /* Control never gets here */          /* Control never gets here */
3577          }          }
# Line 3014  for (;;) Line 3580  for (;;)
3580          pp = eptr;          pp = eptr;
3581          for (i = min; i < max; i++)          for (i = min; i < max; i++)
3582            {            {
3583              pcre_uint32 cc;               /* Faster than pcre_uchar */
3584            if (eptr >= md->end_subject)            if (eptr >= md->end_subject)
3585              {              {
3586              SCHECK_PARTIAL();              SCHECK_PARTIAL();
3587              break;              break;
3588              }              }
3589            if (fc != md->lcc[*eptr]) break;            cc = RAWUCHARTEST(eptr);
3590              if (fc != cc && foc != cc) break;
3591            eptr++;            eptr++;
3592            }            }
3593    
3594          if (possessive) continue;          if (possessive) continue;       /* No backtracking */
3595            for (;;)
         while (eptr >= pp)  
3596            {            {
3597            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM25);            if (eptr == pp) goto TAIL_RECURSE;
3598              RMATCH(eptr, ecode, offset_top, md, eptrb, RM25);
3599            eptr--;            eptr--;
3600            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3601            }            }
3602          MRRETURN(MATCH_NOMATCH);          RRETURN(MATCH_NOMATCH);
3603          }          }
3604        /* Control never gets here */        /* Control never gets here */