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code/trunk/pcre_exec.c revision 178 by ph10, Wed Jun 13 08:44:34 2007 UTC code/branches/pcre16/pcre_exec.c revision 786 by zherczeg, Tue Dec 6 11:33:41 2011 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) 1997-2007 University of Cambridge             Copyright (c) 1997-2011 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 42  POSSIBILITY OF SUCH DAMAGE. Line 42  POSSIBILITY OF SUCH DAMAGE.
42  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
43  possible. There are also some static supporting functions. */  possible. There are also some static supporting functions. */
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
49  #define NLBLOCK md             /* Block containing newline information */  #define NLBLOCK md             /* Block containing newline information */
50  #define PSSTART start_subject  /* Field containing processed string start */  #define PSSTART start_subject  /* Field containing processed string start */
51  #define PSEND   end_subject    /* Field containing processed string end */  #define PSEND   end_subject    /* Field containing processed string end */
# Line 53  possible. There are also some static sup Line 57  possible. There are also some static sup
57  #undef min  #undef min
58  #undef max  #undef max
59    
60  /* The chain of eptrblocks for tail recursions uses memory in stack workspace,  /* Values for setting in md->match_function_type to indicate two special types
61  obtained at top level, the size of which is defined by EPTR_WORK_SIZE. */  of call to match(). We do it this way to save on using another stack variable,
62    as stack usage is to be discouraged. */
 #define EPTR_WORK_SIZE (1000)  
   
 /* Flag bits for the match() function */  
63    
64  #define match_condassert     0x01  /* Called to check a condition assertion */  #define MATCH_CONDASSERT     1  /* Called to check a condition assertion */
65  #define match_cbegroup       0x02  /* Could-be-empty unlimited repeat group */  #define MATCH_CBEGROUP       2  /* Could-be-empty unlimited repeat group */
 #define match_tail_recursed  0x04  /* Tail recursive call */  
66    
67  /* Non-error returns from the match() function. Error returns are externally  /* Non-error returns from the match() function. Error returns are externally
68  defined PCRE_ERROR_xxx codes, which are all negative. */  defined PCRE_ERROR_xxx codes, which are all negative. */
# Line 70  defined PCRE_ERROR_xxx codes, which are Line 70  defined PCRE_ERROR_xxx codes, which are
70  #define MATCH_MATCH        1  #define MATCH_MATCH        1
71  #define MATCH_NOMATCH      0  #define MATCH_NOMATCH      0
72    
73    /* Special internal returns from the match() function. Make them sufficiently
74    negative to avoid the external error codes. */
75    
76    #define MATCH_ACCEPT       (-999)
77    #define MATCH_COMMIT       (-998)
78    #define MATCH_KETRPOS      (-997)
79    #define MATCH_ONCE         (-996)
80    #define MATCH_PRUNE        (-995)
81    #define MATCH_SKIP         (-994)
82    #define MATCH_SKIP_ARG     (-993)
83    #define MATCH_THEN         (-992)
84    
85    /* This is a convenience macro for code that occurs many times. */
86    
87    #define MRRETURN(ra) \
88      { \
89      md->mark = markptr; \
90      RRETURN(ra); \
91      }
92    
93  /* 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.
94  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,
95  because the offset vector is always a multiple of 3 long. */  because the offset vector is always a multiple of 3 long. */
# Line 83  static const char rep_max[] = { 0, 0, 0, Line 103  static const char rep_max[] = { 0, 0, 0,
103    
104    
105    
106  #ifdef DEBUG  #ifdef PCRE_DEBUG
107  /*************************************************  /*************************************************
108  *        Debugging function to print chars       *  *        Debugging function to print chars       *
109  *************************************************/  *************************************************/
# Line 101  Returns:     nothing Line 121  Returns:     nothing
121  */  */
122    
123  static void  static void
124  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)
125  {  {
126  unsigned int c;  unsigned int c;
127  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;
# Line 116  while (length-- > 0) Line 136  while (length-- > 0)
136  *          Match a back-reference                *  *          Match a back-reference                *
137  *************************************************/  *************************************************/
138    
139  /* If a back reference hasn't been set, the length that is passed is greater  /* Normally, if a back reference hasn't been set, the length that is passed is
140  than the number of characters left in the string, so the match fails.  negative, so the match always fails. However, in JavaScript compatibility mode,
141    the length passed is zero. Note that in caseless UTF-8 mode, the number of
142    subject bytes matched may be different to the number of reference bytes.
143    
144  Arguments:  Arguments:
145    offset      index into the offset vector    offset      index into the offset vector
146    eptr        points into the subject    eptr        pointer into the subject
147    length      length to be matched    length      length of reference to be matched (number of bytes)
148    md          points to match data block    md          points to match data block
149    ims         the ims flags    caseless    TRUE if caseless
150    
151  Returns:      TRUE if matched  Returns:      < 0 if not matched, otherwise the number of subject bytes matched
152  */  */
153    
154  static BOOL  static int
155  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,
156    unsigned long int ims)    BOOL caseless)
157  {  {
158  USPTR p = md->start_subject + md->offset_vector[offset];  PCRE_PUCHAR eptr_start = eptr;
159    register PCRE_PUCHAR p = md->start_subject + md->offset_vector[offset];
160    
161  #ifdef DEBUG  #ifdef PCRE_DEBUG
162  if (eptr >= md->end_subject)  if (eptr >= md->end_subject)
163    printf("matching subject <null>");    printf("matching subject <null>");
164  else  else
# Line 148  pchars(p, length, FALSE, md); Line 171  pchars(p, length, FALSE, md);
171  printf("\n");  printf("\n");
172  #endif  #endif
173    
174  /* Always fail if not enough characters left */  /* Always fail if reference not set (and not JavaScript compatible). */
175    
176  if (length > md->end_subject - eptr) return FALSE;  if (length < 0) return -1;
177    
178  /* Separate the caselesss case for speed */  /* Separate the caseless case for speed. In UTF-8 mode we can only do this
179    properly if Unicode properties are supported. Otherwise, we can check only
180    ASCII characters. */
181    
182  if ((ims & PCRE_CASELESS) != 0)  if (caseless)
183    {    {
184    while (length-- > 0)  #ifdef SUPPORT_UTF8
185      if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE;  #ifdef SUPPORT_UCP
186      if (md->utf)
187        {
188        /* Match characters up to the end of the reference. NOTE: the number of
189        bytes matched may differ, because there are some characters whose upper and
190        lower case versions code as different numbers of bytes. For example, U+023A
191        (2 bytes in UTF-8) is the upper case version of U+2C65 (3 bytes in UTF-8);
192        a sequence of 3 of the former uses 6 bytes, as does a sequence of two of
193        the latter. It is important, therefore, to check the length along the
194        reference, not along the subject (earlier code did this wrong). */
195    
196        PCRE_PUCHAR endptr = p + length;
197        while (p < endptr)
198          {
199          int c, d;
200          if (eptr >= md->end_subject) return -1;
201          GETCHARINC(c, eptr);
202          GETCHARINC(d, p);
203          if (c != d && c != UCD_OTHERCASE(d)) return -1;
204          }
205        }
206      else
207    #endif
208    #endif
209    
210      /* The same code works when not in UTF-8 mode and in UTF-8 mode when there
211      is no UCP support. */
212        {
213        if (eptr + length > md->end_subject) return -1;
214        while (length-- > 0)
215          { if (md->lcc[*p++] != md->lcc[*eptr++]) return -1; }
216        }
217    }    }
218    
219    /* In the caseful case, we can just compare the bytes, whether or not we
220    are in UTF-8 mode. */
221    
222  else  else
223    { while (length-- > 0) if (*p++ != *eptr++) return FALSE; }    {
224      if (eptr + length > md->end_subject) return -1;
225      while (length-- > 0) if (*p++ != *eptr++) return -1;
226      }
227    
228  return TRUE;  return eptr - eptr_start;
229  }  }
230    
231    
# Line 205  variable instead of being passed in the Line 268  variable instead of being passed in the
268  ****************************************************************************  ****************************************************************************
269  ***************************************************************************/  ***************************************************************************/
270    
271    /* Numbers for RMATCH calls. When this list is changed, the code at HEAP_RETURN
272  /* Numbers for RMATCH calls */  below must be updated in sync.  */
273    
274  enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM6,  RM7,  RM8,  RM9,  RM10,  enum { RM1=1, RM2,  RM3,  RM4,  RM5,  RM6,  RM7,  RM8,  RM9,  RM10,
275         RM11,  RM12, RM13, RM14, RM15, RM16, RM17, RM18, RM19, RM20,         RM11,  RM12, RM13, RM14, RM15, RM16, RM17, RM18, RM19, RM20,
276         RM21,  RM22, RM23, RM24, RM25, RM26, RM27, RM28, RM29, RM30,         RM21,  RM22, RM23, RM24, RM25, RM26, RM27, RM28, RM29, RM30,
277         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,         RM31,  RM32, RM33, RM34, RM35, RM36, RM37, RM38, RM39, RM40,
278         RM41,  RM42, RM43, RM44, RM45, RM46, RM47 };         RM41,  RM42, RM43, RM44, RM45, RM46, RM47, RM48, RM49, RM50,
279           RM51,  RM52, RM53, RM54, RM55, RM56, RM57, RM58, RM59, RM60,
280           RM61,  RM62, RM63, RM64, RM65, RM66 };
281    
282  /* 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
283  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
284  actuall used in this definition. */  actually used in this definition. */
285    
286  #ifndef NO_RECURSE  #ifndef NO_RECURSE
287  #define REGISTER register  #define REGISTER register
288    
289  #ifdef DEBUG  #ifdef PCRE_DEBUG
290  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \  #define RMATCH(ra,rb,rc,rd,re,rw) \
291    { \    { \
292    printf("match() called in line %d\n", __LINE__); \    printf("match() called in line %d\n", __LINE__); \
293    rrc = match(ra,rb,mstart,rc,rd,re,rf,rg,rdepth+1); \    rrc = match(ra,rb,mstart,markptr,rc,rd,re,rdepth+1); \
294    printf("to line %d\n", __LINE__); \    printf("to line %d\n", __LINE__); \
295    }    }
296  #define RRETURN(ra) \  #define RRETURN(ra) \
# Line 235  actuall used in this definition. */ Line 299  actuall used in this definition. */
299    return ra; \    return ra; \
300    }    }
301  #else  #else
302  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw) \  #define RMATCH(ra,rb,rc,rd,re,rw) \
303    rrc = match(ra,rb,mstart,rc,rd,re,rf,rg,rdepth+1)    rrc = match(ra,rb,mstart,markptr,rc,rd,re,rdepth+1)
304  #define RRETURN(ra) return ra  #define RRETURN(ra) return ra
305  #endif  #endif
306    
# Line 249  argument of match(), which never changes Line 313  argument of match(), which never changes
313    
314  #define REGISTER  #define REGISTER
315    
316  #define RMATCH(ra,rb,rc,rd,re,rf,rg,rw)\  #define RMATCH(ra,rb,rc,rd,re,rw)\
317    {\    {\
318    heapframe *newframe = (pcre_stack_malloc)(sizeof(heapframe));\    heapframe *newframe = (heapframe *)(pcre_stack_malloc)(sizeof(heapframe));\
319      if (newframe == NULL) RRETURN(PCRE_ERROR_NOMEMORY);\
320    frame->Xwhere = rw; \    frame->Xwhere = rw; \
321    newframe->Xeptr = ra;\    newframe->Xeptr = ra;\
322    newframe->Xecode = rb;\    newframe->Xecode = rb;\
323    newframe->Xmstart = mstart;\    newframe->Xmstart = mstart;\
324      newframe->Xmarkptr = markptr;\
325    newframe->Xoffset_top = rc;\    newframe->Xoffset_top = rc;\
326    newframe->Xims = re;\    newframe->Xeptrb = re;\
   newframe->Xeptrb = rf;\  
   newframe->Xflags = rg;\  
327    newframe->Xrdepth = frame->Xrdepth + 1;\    newframe->Xrdepth = frame->Xrdepth + 1;\
328    newframe->Xprevframe = frame;\    newframe->Xprevframe = frame;\
329    frame = newframe;\    frame = newframe;\
# Line 271  argument of match(), which never changes Line 335  argument of match(), which never changes
335    
336  #define RRETURN(ra)\  #define RRETURN(ra)\
337    {\    {\
338    heapframe *newframe = frame;\    heapframe *oldframe = frame;\
339    frame = newframe->Xprevframe;\    frame = oldframe->Xprevframe;\
340    (pcre_stack_free)(newframe);\    (pcre_stack_free)(oldframe);\
341    if (frame != NULL)\    if (frame != NULL)\
342      {\      {\
343      rrc = ra;\      rrc = ra;\
# Line 290  typedef struct heapframe { Line 354  typedef struct heapframe {
354    
355    /* Function arguments that may change */    /* Function arguments that may change */
356    
357    const uschar *Xeptr;    PCRE_PUCHAR Xeptr;
358    const uschar *Xecode;    const pcre_uchar *Xecode;
359    const uschar *Xmstart;    PCRE_PUCHAR Xmstart;
360      PCRE_PUCHAR Xmarkptr;
361    int Xoffset_top;    int Xoffset_top;
   long int Xims;  
362    eptrblock *Xeptrb;    eptrblock *Xeptrb;
   int Xflags;  
363    unsigned int Xrdepth;    unsigned int Xrdepth;
364    
365    /* Function local variables */    /* Function local variables */
366    
367    const uschar *Xcallpat;    PCRE_PUCHAR Xcallpat;
368    const uschar *Xcharptr;  #ifdef SUPPORT_UTF8
369    const uschar *Xdata;    PCRE_PUCHAR Xcharptr;
370    const uschar *Xnext;  #endif
371    const uschar *Xpp;    PCRE_PUCHAR Xdata;
372    const uschar *Xprev;    PCRE_PUCHAR Xnext;
373    const uschar *Xsaved_eptr;    PCRE_PUCHAR Xpp;
374      PCRE_PUCHAR Xprev;
375      PCRE_PUCHAR Xsaved_eptr;
376    
377    recursion_info Xnew_recursive;    recursion_info Xnew_recursive;
378    
# Line 315  typedef struct heapframe { Line 380  typedef struct heapframe {
380    BOOL Xcondition;    BOOL Xcondition;
381    BOOL Xprev_is_word;    BOOL Xprev_is_word;
382    
   unsigned long int Xoriginal_ims;  
   
383  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
384    int Xprop_type;    int Xprop_type;
385    int Xprop_value;    int Xprop_value;
386    int Xprop_fail_result;    int Xprop_fail_result;
   int Xprop_category;  
   int Xprop_chartype;  
   int Xprop_script;  
387    int Xoclength;    int Xoclength;
388    uschar Xocchars[8];    pcre_uchar Xocchars[6];
389  #endif  #endif
390    
391      int Xcodelink;
392    int Xctype;    int Xctype;
393    unsigned int Xfc;    unsigned int Xfc;
394    int Xfi;    int Xfi;
# Line 363  typedef struct heapframe { Line 424  typedef struct heapframe {
424    
425  /* This function is called recursively in many circumstances. Whenever it  /* This function is called recursively in many circumstances. Whenever it
426  returns a negative (error) response, the outer incarnation must also return the  returns a negative (error) response, the outer incarnation must also return the
427  same response.  same response. */
428    
429    /* These macros pack up tests that are used for partial matching, and which
430    appears several times in the code. We set the "hit end" flag if the pointer is
431    at the end of the subject and also past the start of the subject (i.e.
432    something has been matched). For hard partial matching, we then return
433    immediately. The second one is used when we already know we are past the end of
434    the subject. */
435    
436    #define CHECK_PARTIAL()\
437      if (md->partial != 0 && eptr >= md->end_subject && \
438          eptr > md->start_used_ptr) \
439        { \
440        md->hitend = TRUE; \
441        if (md->partial > 1) MRRETURN(PCRE_ERROR_PARTIAL); \
442        }
443    
444    #define SCHECK_PARTIAL()\
445      if (md->partial != 0 && eptr > md->start_used_ptr) \
446        { \
447        md->hitend = TRUE; \
448        if (md->partial > 1) MRRETURN(PCRE_ERROR_PARTIAL); \
449        }
450    
451    
452  Performance note: It might be tempting to extract commonly used fields from the  /* Performance note: It might be tempting to extract commonly used fields from
453  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
454  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
455  made performance worse.  made performance worse.
456    
# Line 375  Arguments: Line 459  Arguments:
459     ecode       pointer to current position in compiled code     ecode       pointer to current position in compiled code
460     mstart      pointer to the current match start position (can be modified     mstart      pointer to the current match start position (can be modified
461                   by encountering \K)                   by encountering \K)
462       markptr     pointer to the most recent MARK name, or NULL
463     offset_top  current top pointer     offset_top  current top pointer
464     md          pointer to "static" info for the match     md          pointer to "static" info for the match
    ims         current /i, /m, and /s options  
465     eptrb       pointer to chain of blocks containing eptr at start of     eptrb       pointer to chain of blocks containing eptr at start of
466                   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  
                  match_tail_recursed - this is a tail_recursed group  
467     rdepth      the recursion depth     rdepth      the recursion depth
468    
469  Returns:       MATCH_MATCH if matched            )  these values are >= 0  Returns:       MATCH_MATCH if matched            )  these values are >= 0
470                 MATCH_NOMATCH if failed to match  )                 MATCH_NOMATCH if failed to match  )
471                   a negative MATCH_xxx value for PRUNE, SKIP, etc
472                 a negative PCRE_ERROR_xxx value if aborted by an error condition                 a negative PCRE_ERROR_xxx value if aborted by an error condition
473                   (e.g. stopped by repeated call or recursion limit)                   (e.g. stopped by repeated call or recursion limit)
474  */  */
475    
476  static int  static int
477  match(REGISTER USPTR eptr, REGISTER const uschar *ecode, const uschar *mstart,  match(REGISTER PCRE_PUCHAR eptr, REGISTER const pcre_uchar *ecode,
478    int offset_top, match_data *md, unsigned long int ims, eptrblock *eptrb,    PCRE_PUCHAR mstart, const pcre_uchar *markptr, int offset_top,
479    int flags, unsigned int rdepth)    match_data *md, eptrblock *eptrb, unsigned int rdepth)
480  {  {
481  /* 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,
482  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 405  so they can be ordinary variables in all Line 485  so they can be ordinary variables in all
485  register int  rrc;         /* Returns from recursive calls */  register int  rrc;         /* Returns from recursive calls */
486  register int  i;           /* Used for loops not involving calls to RMATCH() */  register int  i;           /* Used for loops not involving calls to RMATCH() */
487  register unsigned int c;   /* Character values not kept over RMATCH() calls */  register unsigned int c;   /* Character values not kept over RMATCH() calls */
488  register BOOL utf8;        /* Local copy of UTF-8 flag for speed */  register BOOL utf;         /* Local copy of UTF flag for speed */
489    
490  BOOL minimize, possessive; /* Quantifier options */  BOOL minimize, possessive; /* Quantifier options */
491    BOOL caseless;
492    int condcode;
493    
494  /* 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
495  preserved over calls to RMATCH() are part of a "frame" which is obtained from  preserved over calls to RMATCH() are part of a "frame" which is obtained from
# Line 415  heap storage. Set up the top-level frame Line 497  heap storage. Set up the top-level frame
497  heap whenever RMATCH() does a "recursion". See the macro definitions above. */  heap whenever RMATCH() does a "recursion". See the macro definitions above. */
498    
499  #ifdef NO_RECURSE  #ifdef NO_RECURSE
500  heapframe *frame = (pcre_stack_malloc)(sizeof(heapframe));  heapframe *frame = (heapframe *)(pcre_stack_malloc)(sizeof(heapframe));
501    if (frame == NULL) RRETURN(PCRE_ERROR_NOMEMORY);
502  frame->Xprevframe = NULL;            /* Marks the top level */  frame->Xprevframe = NULL;            /* Marks the top level */
503    
504  /* Copy in the original argument variables */  /* Copy in the original argument variables */
# Line 423  frame->Xprevframe = NULL;            /* Line 506  frame->Xprevframe = NULL;            /*
506  frame->Xeptr = eptr;  frame->Xeptr = eptr;
507  frame->Xecode = ecode;  frame->Xecode = ecode;
508  frame->Xmstart = mstart;  frame->Xmstart = mstart;
509    frame->Xmarkptr = markptr;
510  frame->Xoffset_top = offset_top;  frame->Xoffset_top = offset_top;
 frame->Xims = ims;  
511  frame->Xeptrb = eptrb;  frame->Xeptrb = eptrb;
 frame->Xflags = flags;  
512  frame->Xrdepth = rdepth;  frame->Xrdepth = rdepth;
513    
514  /* This is where control jumps back to to effect "recursion" */  /* This is where control jumps back to to effect "recursion" */
# Line 438  HEAP_RECURSE: Line 520  HEAP_RECURSE:
520  #define eptr               frame->Xeptr  #define eptr               frame->Xeptr
521  #define ecode              frame->Xecode  #define ecode              frame->Xecode
522  #define mstart             frame->Xmstart  #define mstart             frame->Xmstart
523    #define markptr            frame->Xmarkptr
524  #define offset_top         frame->Xoffset_top  #define offset_top         frame->Xoffset_top
 #define ims                frame->Xims  
525  #define eptrb              frame->Xeptrb  #define eptrb              frame->Xeptrb
 #define flags              frame->Xflags  
526  #define rdepth             frame->Xrdepth  #define rdepth             frame->Xrdepth
527    
528  /* Ditto for the local variables */  /* Ditto for the local variables */
# Line 450  HEAP_RECURSE: Line 531  HEAP_RECURSE:
531  #define charptr            frame->Xcharptr  #define charptr            frame->Xcharptr
532  #endif  #endif
533  #define callpat            frame->Xcallpat  #define callpat            frame->Xcallpat
534    #define codelink           frame->Xcodelink
535  #define data               frame->Xdata  #define data               frame->Xdata
536  #define next               frame->Xnext  #define next               frame->Xnext
537  #define pp                 frame->Xpp  #define pp                 frame->Xpp
# Line 462  HEAP_RECURSE: Line 544  HEAP_RECURSE:
544  #define condition          frame->Xcondition  #define condition          frame->Xcondition
545  #define prev_is_word       frame->Xprev_is_word  #define prev_is_word       frame->Xprev_is_word
546    
 #define original_ims       frame->Xoriginal_ims  
   
547  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
548  #define prop_type          frame->Xprop_type  #define prop_type          frame->Xprop_type
549  #define prop_value         frame->Xprop_value  #define prop_value         frame->Xprop_value
550  #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  
551  #define oclength           frame->Xoclength  #define oclength           frame->Xoclength
552  #define occhars            frame->Xocchars  #define occhars            frame->Xocchars
553  #endif  #endif
# Line 500  i, and fc and c, can be the same variabl Line 577  i, and fc and c, can be the same variabl
577  #define fi i  #define fi i
578  #define fc c  #define fc c
579    
580    /* Many of the following variables are used only in small blocks of the code.
581    My normal style of coding would have declared them within each of those blocks.
582    However, in order to accommodate the version of this code that uses an external
583    "stack" implemented on the heap, it is easier to declare them all here, so the
584    declarations can be cut out in a block. The only declarations within blocks
585    below are for variables that do not have to be preserved over a recursive call
586    to RMATCH(). */
587    
588    #ifdef SUPPORT_UTF8
589    const pcre_uchar *charptr;
590    #endif
591    const pcre_uchar *callpat;
592    const pcre_uchar *data;
593    const pcre_uchar *next;
594    PCRE_PUCHAR       pp;
595    const pcre_uchar *prev;
596    PCRE_PUCHAR       saved_eptr;
597    
598    recursion_info new_recursive;
599    
600  #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().          */  
601  BOOL condition;  BOOL condition;
602  BOOL prev_is_word;  BOOL prev_is_word;
603    
 unsigned long int original_ims;  
   
604  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
605  int prop_type;  int prop_type;
606  int prop_value;  int prop_value;
607  int prop_fail_result;  int prop_fail_result;
 int prop_category;  
 int prop_chartype;  
 int prop_script;  
608  int oclength;  int oclength;
609  uschar occhars[8];  pcre_uchar occhars[6];
610  #endif  #endif
611    
612    int codelink;
613  int ctype;  int ctype;
614  int length;  int length;
615  int max;  int max;
# Line 544  int stacksave[REC_STACK_SAVE_MAX]; Line 624  int stacksave[REC_STACK_SAVE_MAX];
624  eptrblock newptrb;  eptrblock newptrb;
625  #endif     /* NO_RECURSE */  #endif     /* NO_RECURSE */
626    
627    /* To save space on the stack and in the heap frame, I have doubled up on some
628    of the local variables that are used only in localised parts of the code, but
629    still need to be preserved over recursive calls of match(). These macros define
630    the alternative names that are used. */
631    
632    #define allow_zero    cur_is_word
633    #define cbegroup      condition
634    #define code_offset   codelink
635    #define condassert    condition
636    #define matched_once  prev_is_word
637    
638  /* These statements are here to stop the compiler complaining about unitialized  /* These statements are here to stop the compiler complaining about unitialized
639  variables. */  variables. */
640    
# Line 563  TAIL_RECURSE: Line 654  TAIL_RECURSE:
654  /* OK, now we can get on with the real code of the function. Recursive calls  /* OK, now we can get on with the real code of the function. Recursive calls
655  are specified by the macro RMATCH and RRETURN is used to return. When  are specified by the macro RMATCH and RRETURN is used to return. When
656  NO_RECURSE is *not* defined, these just turn into a recursive call to match()  NO_RECURSE is *not* defined, these just turn into a recursive call to match()
657  and a "return", respectively (possibly with some debugging if DEBUG is  and a "return", respectively (possibly with some debugging if PCRE_DEBUG is
658  defined). However, RMATCH isn't like a function call because it's quite a  defined). However, RMATCH isn't like a function call because it's quite a
659  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,
660  however, impact performance when true recursion is being used. */  however, impact performance when true recursion is being used. */
661    
662  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
663  utf8 = md->utf8;       /* Local copy of the flag */  utf = md->utf;       /* Local copy of the flag */
664  #else  #else
665  utf8 = FALSE;  utf = FALSE;
666  #endif  #endif
667    
668  /* 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 580  haven't exceeded the recursive call limi Line 671  haven't exceeded the recursive call limi
671  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);  if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT);
672  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);  if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT);
673    
 original_ims = ims;    /* Save for resetting on ')' */  
   
674  /* 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
675  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
676  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
677  hit the closing ket, in order to break infinite loops that match no characters.  up space on the stack. See also MATCH_CONDASSERT below.
678  When match() is called in other circumstances, don't add to the chain. If this  
679  is a tail recursion, use a block from the workspace, as the one on the stack is  When MATCH_CBEGROUP is set, add the current subject pointer to the chain of
680  already used. */  such remembered pointers, to be checked when we hit the closing ket, in order
681    to break infinite loops that match no characters. When match() is called in
682    other circumstances, don't add to the chain. The MATCH_CBEGROUP feature must
683    NOT be used with tail recursion, because the memory block that is used is on
684    the stack, so a new one may be required for each match(). */
685    
686  if ((flags & match_cbegroup) != 0)  if (md->match_function_type == MATCH_CBEGROUP)
687    {    {
688    eptrblock *p;    newptrb.epb_saved_eptr = eptr;
689    if ((flags & match_tail_recursed) != 0)    newptrb.epb_prev = eptrb;
690      {    eptrb = &newptrb;
691      if (md->eptrn >= EPTR_WORK_SIZE) RRETURN(PCRE_ERROR_NULLWSLIMIT);    md->match_function_type = 0;
     p = md->eptrchain + md->eptrn++;  
     }  
   else p = &newptrb;  
   p->epb_saved_eptr = eptr;  
   p->epb_prev = eptrb;  
   eptrb = p;  
692    }    }
693    
694  /* Now start processing the opcodes. */  /* Now start processing the opcodes. */
# Line 611  for (;;) Line 698  for (;;)
698    minimize = possessive = FALSE;    minimize = possessive = FALSE;
699    op = *ecode;    op = *ecode;
700    
   /* For partial matching, remember if we ever hit the end of the subject after  
   matching at least one subject character. */  
   
   if (md->partial &&  
       eptr >= md->end_subject &&  
       eptr > mstart)  
     md->hitend = TRUE;  
   
701    switch(op)    switch(op)
702      {      {
703      /* Handle a capturing bracket. If there is space in the offset vector, save      case OP_MARK:
704      the current subject position in the working slot at the top of the vector.      markptr = ecode + 2;
705      We mustn't change the current values of the data slot, because they may be      RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
706      set from a previous iteration of this group, and be referred to by a        eptrb, RM55);
707      reference inside the group.  
708        /* A return of MATCH_SKIP_ARG means that matching failed at SKIP with an
709      If the bracket fails to match, we need to restore this value and also the      argument, and we must check whether that argument matches this MARK's
710      values of the final offsets, in case they were set by a previous iteration      argument. It is passed back in md->start_match_ptr (an overloading of that
711      of the same bracket.      variable). If it does match, we reset that variable to the current subject
712        position and return MATCH_SKIP. Otherwise, pass back the return code
713        unaltered. */
714    
715        if (rrc == MATCH_SKIP_ARG &&
716            STRCMP_UC_UC(markptr, md->start_match_ptr) == 0)
717          {
718          md->start_match_ptr = eptr;
719          RRETURN(MATCH_SKIP);
720          }
721    
722        if (md->mark == NULL) md->mark = markptr;
723        RRETURN(rrc);
724    
725        case OP_FAIL:
726        MRRETURN(MATCH_NOMATCH);
727    
728        /* COMMIT overrides PRUNE, SKIP, and THEN */
729    
730        case OP_COMMIT:
731        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
732          eptrb, RM52);
733        if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE &&
734            rrc != MATCH_SKIP && rrc != MATCH_SKIP_ARG &&
735            rrc != MATCH_THEN)
736          RRETURN(rrc);
737        MRRETURN(MATCH_COMMIT);
738    
739        /* PRUNE overrides THEN */
740    
741        case OP_PRUNE:
742        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
743          eptrb, RM51);
744        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
745        MRRETURN(MATCH_PRUNE);
746    
747        case OP_PRUNE_ARG:
748        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
749          eptrb, RM56);
750        if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
751        md->mark = ecode + 2;
752        RRETURN(MATCH_PRUNE);
753    
754        /* SKIP overrides PRUNE and THEN */
755    
756        case OP_SKIP:
757        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
758          eptrb, RM53);
759        if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)
760          RRETURN(rrc);
761        md->start_match_ptr = eptr;   /* Pass back current position */
762        MRRETURN(MATCH_SKIP);
763    
764        case OP_SKIP_ARG:
765        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top, md,
766          eptrb, RM57);
767        if (rrc != MATCH_NOMATCH && rrc != MATCH_PRUNE && rrc != MATCH_THEN)
768          RRETURN(rrc);
769    
770        /* Pass back the current skip name by overloading md->start_match_ptr and
771        returning the special MATCH_SKIP_ARG return code. This will either be
772        caught by a matching MARK, or get to the top, where it is treated the same
773        as PRUNE. */
774    
775        md->start_match_ptr = ecode + 2;
776        RRETURN(MATCH_SKIP_ARG);
777    
778        /* For THEN (and THEN_ARG) we pass back the address of the opcode, so that
779        the branch in which it occurs can be determined. Overload the start of
780        match pointer to do this. */
781    
782        case OP_THEN:
783        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
784          eptrb, RM54);
785        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
786        md->start_match_ptr = ecode;
787        MRRETURN(MATCH_THEN);
788    
789        case OP_THEN_ARG:
790        RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode] + ecode[1], offset_top,
791          md, eptrb, RM58);
792        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
793        md->start_match_ptr = ecode;
794        md->mark = ecode + 2;
795        RRETURN(MATCH_THEN);
796    
797        /* Handle an atomic group that does not contain any capturing parentheses.
798        This can be handled like an assertion. Prior to 8.13, all atomic groups
799        were handled this way. In 8.13, the code was changed as below for ONCE, so
800        that backups pass through the group and thereby reset captured values.
801        However, this uses a lot more stack, so in 8.20, atomic groups that do not
802        contain any captures generate OP_ONCE_NC, which can be handled in the old,
803        less stack intensive way.
804    
805        Check the alternative branches in turn - the matching won't pass the KET
806        for this kind of subpattern. If any one branch matches, we carry on as at
807        the end of a normal bracket, leaving the subject pointer, but resetting
808        the start-of-match value in case it was changed by \K. */
809    
810        case OP_ONCE_NC:
811        prev = ecode;
812        saved_eptr = eptr;
813        do
814          {
815          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM64);
816          if (rrc == MATCH_MATCH)  /* Note: _not_ MATCH_ACCEPT */
817            {
818            mstart = md->start_match_ptr;
819            markptr = md->mark;
820            break;
821            }
822          if (rrc == MATCH_THEN)
823            {
824            next = ecode + GET(ecode,1);
825            if (md->start_match_ptr < next &&
826                (*ecode == OP_ALT || *next == OP_ALT))
827              rrc = MATCH_NOMATCH;
828            }
829    
830          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
831          ecode += GET(ecode,1);
832          }
833        while (*ecode == OP_ALT);
834    
835        /* If hit the end of the group (which could be repeated), fail */
836    
837        if (*ecode != OP_ONCE_NC && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH);
838    
839        /* Continue as from after the group, updating the offsets high water
840        mark, since extracts may have been taken. */
841    
842        do ecode += GET(ecode, 1); while (*ecode == OP_ALT);
843    
844        offset_top = md->end_offset_top;
845        eptr = md->end_match_ptr;
846    
847        /* For a non-repeating ket, just continue at this level. This also
848        happens for a repeating ket if no characters were matched in the group.
849        This is the forcible breaking of infinite loops as implemented in Perl
850        5.005. */
851    
852        if (*ecode == OP_KET || eptr == saved_eptr)
853          {
854          ecode += 1+LINK_SIZE;
855          break;
856          }
857    
858        /* The repeating kets try the rest of the pattern or restart from the
859        preceding bracket, in the appropriate order. The second "call" of match()
860        uses tail recursion, to avoid using another stack frame. */
861    
862        if (*ecode == OP_KETRMIN)
863          {
864          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM65);
865          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
866          ecode = prev;
867          goto TAIL_RECURSE;
868          }
869        else  /* OP_KETRMAX */
870          {
871          md->match_function_type = MATCH_CBEGROUP;
872          RMATCH(eptr, prev, offset_top, md, eptrb, RM66);
873          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
874          ecode += 1 + LINK_SIZE;
875          goto TAIL_RECURSE;
876          }
877        /* Control never gets here */
878    
879        /* Handle a capturing bracket, other than those that are possessive with an
880        unlimited repeat. If there is space in the offset vector, save the current
881        subject position in the working slot at the top of the vector. We mustn't
882        change the current values of the data slot, because they may be set from a
883        previous iteration of this group, and be referred to by a reference inside
884        the group. A failure to match might occur after the group has succeeded,
885        if something later on doesn't match. For this reason, we need to restore
886        the working value and also the values of the final offsets, in case they
887        were set by a previous iteration of the same bracket.
888    
889      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
890      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 640  for (;;) Line 895  for (;;)
895      number = GET2(ecode, 1+LINK_SIZE);      number = GET2(ecode, 1+LINK_SIZE);
896      offset = number << 1;      offset = number << 1;
897    
898  #ifdef DEBUG  #ifdef PCRE_DEBUG
899      printf("start bracket %d\n", number);      printf("start bracket %d\n", number);
900      printf("subject=");      printf("subject=");
901      pchars(eptr, 16, TRUE, md);      pchars(eptr, 16, TRUE, md);
# Line 655  for (;;) Line 910  for (;;)
910        save_capture_last = md->capture_last;        save_capture_last = md->capture_last;
911    
912        DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));        DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
913        md->offset_vector[md->offset_end - number] = eptr - md->start_subject;        md->offset_vector[md->offset_end - number] =
914            (int)(eptr - md->start_subject);
915    
916        flags = (op == OP_SCBRA)? match_cbegroup : 0;        for (;;)
       do  
917          {          {
918          RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md,          if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
919            ims, eptrb, flags, RM1);          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
920              eptrb, RM1);
921            if (rrc == MATCH_ONCE) break;  /* Backing up through an atomic group */
922    
923            /* If we backed up to a THEN, check whether it is within the current
924            branch by comparing the address of the THEN that is passed back with
925            the end of the branch. If it is within the current branch, and the
926            branch is one of two or more alternatives (it either starts or ends
927            with OP_ALT), we have reached the limit of THEN's action, so convert
928            the return code to NOMATCH, which will cause normal backtracking to
929            happen from now on. Otherwise, THEN is passed back to an outer
930            alternative. This implements Perl's treatment of parenthesized groups,
931            where a group not containing | does not affect the current alternative,
932            that is, (X) is NOT the same as (X|(*F)). */
933    
934            if (rrc == MATCH_THEN)
935              {
936              next = ecode + GET(ecode,1);
937              if (md->start_match_ptr < next &&
938                  (*ecode == OP_ALT || *next == OP_ALT))
939                rrc = MATCH_NOMATCH;
940              }
941    
942            /* Anything other than NOMATCH is passed back. */
943    
944          if (rrc != MATCH_NOMATCH) RRETURN(rrc);          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
945          md->capture_last = save_capture_last;          md->capture_last = save_capture_last;
946          ecode += GET(ecode, 1);          ecode += GET(ecode, 1);
947            if (*ecode != OP_ALT) break;
948          }          }
       while (*ecode == OP_ALT);  
949    
950        DPRINTF(("bracket %d failed\n", number));        DPRINTF(("bracket %d failed\n", number));
   
951        md->offset_vector[offset] = save_offset1;        md->offset_vector[offset] = save_offset1;
952        md->offset_vector[offset+1] = save_offset2;        md->offset_vector[offset+1] = save_offset2;
953        md->offset_vector[md->offset_end - number] = save_offset3;        md->offset_vector[md->offset_end - number] = save_offset3;
954    
955        RRETURN(MATCH_NOMATCH);        /* At this point, rrc will be one of MATCH_ONCE or MATCH_NOMATCH. */
956    
957          if (md->mark == NULL) md->mark = markptr;
958          RRETURN(rrc);
959        }        }
960    
961      /* Insufficient room for saving captured contents. Treat as a non-capturing      /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
962      bracket. */      as a non-capturing bracket. */
963    
964        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
965        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
966    
967      DPRINTF(("insufficient capture room: treat as non-capturing\n"));      DPRINTF(("insufficient capture room: treat as non-capturing\n"));
968    
969      /* Non-capturing bracket. Loop for all the alternatives. When we get to the      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
970      final alternative within the brackets, we would return the result of a      /* VVVVVVVVVVVVVVVVVVVVVVVVV */
     recursive call to match() whatever happened. We can reduce stack usage by  
     turning this into a tail recursion. */  
971    
972        /* Non-capturing or atomic group, except for possessive with unlimited
973        repeat and ONCE group with no captures. Loop for all the alternatives.
974    
975        When we get to the final alternative within the brackets, we used to return
976        the result of a recursive call to match() whatever happened so it was
977        possible to reduce stack usage by turning this into a tail recursion,
978        except in the case of a possibly empty group. However, now that there is
979        the possiblity of (*THEN) occurring in the final alternative, this
980        optimization is no longer always possible.
981    
982        We can optimize if we know there are no (*THEN)s in the pattern; at present
983        this is the best that can be done.
984    
985        MATCH_ONCE is returned when the end of an atomic group is successfully
986        reached, but subsequent matching fails. It passes back up the tree (causing
987        captured values to be reset) until the original atomic group level is
988        reached. This is tested by comparing md->once_target with the start of the
989        group. At this point, the return is converted into MATCH_NOMATCH so that
990        previous backup points can be taken. */
991    
992        case OP_ONCE:
993      case OP_BRA:      case OP_BRA:
994      case OP_SBRA:      case OP_SBRA:
995      DPRINTF(("start non-capturing bracket\n"));      DPRINTF(("start non-capturing bracket\n"));
996      flags = (op >= OP_SBRA)? match_cbegroup : 0;  
997      for (;;)      for (;;)
998        {        {
999        if (ecode[GET(ecode, 1)] != OP_ALT)        if (op >= OP_SBRA || op == OP_ONCE) md->match_function_type = MATCH_CBEGROUP;
1000    
1001          /* If this is not a possibly empty group, and there are no (*THEN)s in
1002          the pattern, and this is the final alternative, optimize as described
1003          above. */
1004    
1005          else if (!md->hasthen && ecode[GET(ecode, 1)] != OP_ALT)
1006          {          {
1007          ecode += _pcre_OP_lengths[*ecode];          ecode += PRIV(OP_lengths)[*ecode];
         flags |= match_tail_recursed;  
         DPRINTF(("bracket 0 tail recursion\n"));  
1008          goto TAIL_RECURSE;          goto TAIL_RECURSE;
1009          }          }
1010    
1011        /* For non-final alternatives, continue the loop for a NOMATCH result;        /* In all other cases, we have to make another call to match(). */
1012        otherwise return. */  
1013          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md, eptrb,
1014            RM2);
1015    
1016          /* See comment in the code for capturing groups above about handling
1017          THEN. */
1018    
1019          if (rrc == MATCH_THEN)
1020            {
1021            next = ecode + GET(ecode,1);
1022            if (md->start_match_ptr < next &&
1023                (*ecode == OP_ALT || *next == OP_ALT))
1024              rrc = MATCH_NOMATCH;
1025            }
1026    
1027          if (rrc != MATCH_NOMATCH)
1028            {
1029            if (rrc == MATCH_ONCE)
1030              {
1031              const pcre_uchar *scode = ecode;
1032              if (*scode != OP_ONCE)           /* If not at start, find it */
1033                {
1034                while (*scode == OP_ALT) scode += GET(scode, 1);
1035                scode -= GET(scode, 1);
1036                }
1037              if (md->once_target == scode) rrc = MATCH_NOMATCH;
1038              }
1039            RRETURN(rrc);
1040            }
1041          ecode += GET(ecode, 1);
1042          if (*ecode != OP_ALT) break;
1043          }
1044    
1045        if (md->mark == NULL) md->mark = markptr;
1046        RRETURN(MATCH_NOMATCH);
1047    
1048        /* Handle possessive capturing brackets with an unlimited repeat. We come
1049        here from BRAZERO with allow_zero set TRUE. The offset_vector values are
1050        handled similarly to the normal case above. However, the matching is
1051        different. The end of these brackets will always be OP_KETRPOS, which
1052        returns MATCH_KETRPOS without going further in the pattern. By this means
1053        we can handle the group by iteration rather than recursion, thereby
1054        reducing the amount of stack needed. */
1055    
1056        case OP_CBRAPOS:
1057        case OP_SCBRAPOS:
1058        allow_zero = FALSE;
1059    
1060        POSSESSIVE_CAPTURE:
1061        number = GET2(ecode, 1+LINK_SIZE);
1062        offset = number << 1;
1063    
1064    #ifdef PCRE_DEBUG
1065        printf("start possessive bracket %d\n", number);
1066        printf("subject=");
1067        pchars(eptr, 16, TRUE, md);
1068        printf("\n");
1069    #endif
1070    
1071        if (offset < md->offset_max)
1072          {
1073          matched_once = FALSE;
1074          code_offset = ecode - md->start_code;
1075    
1076          save_offset1 = md->offset_vector[offset];
1077          save_offset2 = md->offset_vector[offset+1];
1078          save_offset3 = md->offset_vector[md->offset_end - number];
1079          save_capture_last = md->capture_last;
1080    
1081          DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3));
1082    
1083          /* Each time round the loop, save the current subject position for use
1084          when the group matches. For MATCH_MATCH, the group has matched, so we
1085          restart it with a new subject starting position, remembering that we had
1086          at least one match. For MATCH_NOMATCH, carry on with the alternatives, as
1087          usual. If we haven't matched any alternatives in any iteration, check to
1088          see if a previous iteration matched. If so, the group has matched;
1089          continue from afterwards. Otherwise it has failed; restore the previous
1090          capture values before returning NOMATCH. */
1091    
1092          for (;;)
1093            {
1094            md->offset_vector[md->offset_end - number] =
1095              (int)(eptr - md->start_subject);
1096            if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
1097            RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
1098              eptrb, RM63);
1099            if (rrc == MATCH_KETRPOS)
1100              {
1101              offset_top = md->end_offset_top;
1102              eptr = md->end_match_ptr;
1103              ecode = md->start_code + code_offset;
1104              save_capture_last = md->capture_last;
1105              matched_once = TRUE;
1106              continue;
1107              }
1108    
1109            /* See comment in the code for capturing groups above about handling
1110            THEN. */
1111    
1112            if (rrc == MATCH_THEN)
1113              {
1114              next = ecode + GET(ecode,1);
1115              if (md->start_match_ptr < next &&
1116                  (*ecode == OP_ALT || *next == OP_ALT))
1117                rrc = MATCH_NOMATCH;
1118              }
1119    
1120            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1121            md->capture_last = save_capture_last;
1122            ecode += GET(ecode, 1);
1123            if (*ecode != OP_ALT) break;
1124            }
1125    
1126          if (!matched_once)
1127            {
1128            md->offset_vector[offset] = save_offset1;
1129            md->offset_vector[offset+1] = save_offset2;
1130            md->offset_vector[md->offset_end - number] = save_offset3;
1131            }
1132    
1133          if (md->mark == NULL) md->mark = markptr;
1134          if (allow_zero || matched_once)
1135            {
1136            ecode += 1 + LINK_SIZE;
1137            break;
1138            }
1139    
1140          RRETURN(MATCH_NOMATCH);
1141          }
1142    
1143        /* FALL THROUGH ... Insufficient room for saving captured contents. Treat
1144        as a non-capturing bracket. */
1145    
1146        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1147        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1148    
1149        DPRINTF(("insufficient capture room: treat as non-capturing\n"));
1150    
1151        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1152        /* VVVVVVVVVVVVVVVVVVVVVVVVV */
1153    
1154        /* Non-capturing possessive bracket with unlimited repeat. We come here
1155        from BRAZERO with allow_zero = TRUE. The code is similar to the above,
1156        without the capturing complication. It is written out separately for speed
1157        and cleanliness. */
1158    
1159        case OP_BRAPOS:
1160        case OP_SBRAPOS:
1161        allow_zero = FALSE;
1162    
1163        POSSESSIVE_NON_CAPTURE:
1164        matched_once = FALSE;
1165        code_offset = ecode - md->start_code;
1166    
1167        for (;;)
1168          {
1169          if (op >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
1170          RMATCH(eptr, ecode + PRIV(OP_lengths)[*ecode], offset_top, md,
1171            eptrb, RM48);
1172          if (rrc == MATCH_KETRPOS)
1173            {
1174            offset_top = md->end_offset_top;
1175            eptr = md->end_match_ptr;
1176            ecode = md->start_code + code_offset;
1177            matched_once = TRUE;
1178            continue;
1179            }
1180    
1181          /* See comment in the code for capturing groups above about handling
1182          THEN. */
1183    
1184          if (rrc == MATCH_THEN)
1185            {
1186            next = ecode + GET(ecode,1);
1187            if (md->start_match_ptr < next &&
1188                (*ecode == OP_ALT || *next == OP_ALT))
1189              rrc = MATCH_NOMATCH;
1190            }
1191    
       RMATCH(eptr, ecode + _pcre_OP_lengths[*ecode], offset_top, md, ims,  
         eptrb, flags, RM2);  
1192        if (rrc != MATCH_NOMATCH) RRETURN(rrc);        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1193        ecode += GET(ecode, 1);        ecode += GET(ecode, 1);
1194          if (*ecode != OP_ALT) break;
1195          }
1196    
1197        if (matched_once || allow_zero)
1198          {
1199          ecode += 1 + LINK_SIZE;
1200          break;
1201        }        }
1202        RRETURN(MATCH_NOMATCH);
1203    
1204      /* Control never reaches here. */      /* Control never reaches here. */
1205    
1206      /* Conditional group: compilation checked that there are no more than      /* Conditional group: compilation checked that there are no more than
1207      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
1208      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
1209      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. */  
1210    
1211      case OP_COND:      case OP_COND:
1212      case OP_SCOND:      case OP_SCOND:
1213      if (ecode[LINK_SIZE+1] == OP_RREF)         /* Recursion test */      codelink = GET(ecode, 1);
1214    
1215        /* Because of the way auto-callout works during compile, a callout item is
1216        inserted between OP_COND and an assertion condition. */
1217    
1218        if (ecode[LINK_SIZE+1] == OP_CALLOUT)
1219          {
1220          if (pcre_callout != NULL)
1221            {
1222            pcre_callout_block cb;
1223            cb.version          = 2;   /* Version 1 of the callout block */
1224            cb.callout_number   = ecode[LINK_SIZE+2];
1225            cb.offset_vector    = md->offset_vector;
1226            cb.subject          = (PCRE_SPTR)md->start_subject;
1227            cb.subject_length   = (int)(md->end_subject - md->start_subject);
1228            cb.start_match      = (int)(mstart - md->start_subject);
1229            cb.current_position = (int)(eptr - md->start_subject);
1230            cb.pattern_position = GET(ecode, LINK_SIZE + 3);
1231            cb.next_item_length = GET(ecode, 3 + 2*LINK_SIZE);
1232            cb.capture_top      = offset_top/2;
1233            cb.capture_last     = md->capture_last;
1234            cb.callout_data     = md->callout_data;
1235            cb.mark             = (unsigned char *)markptr;
1236            if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);
1237            if (rrc < 0) RRETURN(rrc);
1238            }
1239          ecode += PRIV(OP_lengths)[OP_CALLOUT];
1240          }
1241    
1242        condcode = ecode[LINK_SIZE+1];
1243    
1244        /* Now see what the actual condition is */
1245    
1246        if (condcode == OP_RREF || condcode == OP_NRREF)    /* Recursion test */
1247        {        {
1248        offset = GET2(ecode, LINK_SIZE + 2);     /* Recursion group number*/        if (md->recursive == NULL)                /* Not recursing => FALSE */
1249        condition = md->recursive != NULL &&          {
1250          (offset == RREF_ANY || offset == md->recursive->group_num);          condition = FALSE;
1251        ecode += condition? 3 : GET(ecode, 1);          ecode += GET(ecode, 1);
1252            }
1253          else
1254            {
1255            int recno = GET2(ecode, LINK_SIZE + 2);   /* Recursion group number*/
1256            condition = (recno == RREF_ANY || recno == md->recursive->group_num);
1257    
1258            /* If the test is for recursion into a specific subpattern, and it is
1259            false, but the test was set up by name, scan the table to see if the
1260            name refers to any other numbers, and test them. The condition is true
1261            if any one is set. */
1262    
1263            if (!condition && condcode == OP_NRREF)
1264              {
1265              pcre_uchar *slotA = md->name_table;
1266              for (i = 0; i < md->name_count; i++)
1267                {
1268                if (GET2(slotA, 0) == recno) break;
1269                slotA += md->name_entry_size;
1270                }
1271    
1272              /* Found a name for the number - there can be only one; duplicate
1273              names for different numbers are allowed, but not vice versa. First
1274              scan down for duplicates. */
1275    
1276              if (i < md->name_count)
1277                {
1278                pcre_uchar *slotB = slotA;
1279                while (slotB > md->name_table)
1280                  {
1281                  slotB -= md->name_entry_size;
1282                  if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1283                    {
1284                    condition = GET2(slotB, 0) == md->recursive->group_num;
1285                    if (condition) break;
1286                    }
1287                  else break;
1288                  }
1289    
1290                /* Scan up for duplicates */
1291    
1292                if (!condition)
1293                  {
1294                  slotB = slotA;
1295                  for (i++; i < md->name_count; i++)
1296                    {
1297                    slotB += md->name_entry_size;
1298                    if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1299                      {
1300                      condition = GET2(slotB, 0) == md->recursive->group_num;
1301                      if (condition) break;
1302                      }
1303                    else break;
1304                    }
1305                  }
1306                }
1307              }
1308    
1309            /* Chose branch according to the condition */
1310    
1311            ecode += condition? 1 + IMM2_SIZE : GET(ecode, 1);
1312            }
1313        }        }
1314    
1315      else if (ecode[LINK_SIZE+1] == OP_CREF)    /* Group used test */      else if (condcode == OP_CREF || condcode == OP_NCREF)  /* Group used test */
1316        {        {
1317        offset = GET2(ecode, LINK_SIZE+2) << 1;  /* Doubled ref number */        offset = GET2(ecode, LINK_SIZE+2) << 1;  /* Doubled ref number */
1318        condition = offset < offset_top && md->offset_vector[offset] >= 0;        condition = offset < offset_top && md->offset_vector[offset] >= 0;
1319        ecode += condition? 3 : GET(ecode, 1);  
1320          /* If the numbered capture is unset, but the reference was by name,
1321          scan the table to see if the name refers to any other numbers, and test
1322          them. The condition is true if any one is set. This is tediously similar
1323          to the code above, but not close enough to try to amalgamate. */
1324    
1325          if (!condition && condcode == OP_NCREF)
1326            {
1327            int refno = offset >> 1;
1328            pcre_uchar *slotA = md->name_table;
1329    
1330            for (i = 0; i < md->name_count; i++)
1331              {
1332              if (GET2(slotA, 0) == refno) break;
1333              slotA += md->name_entry_size;
1334              }
1335    
1336            /* Found a name for the number - there can be only one; duplicate names
1337            for different numbers are allowed, but not vice versa. First scan down
1338            for duplicates. */
1339    
1340            if (i < md->name_count)
1341              {
1342              pcre_uchar *slotB = slotA;
1343              while (slotB > md->name_table)
1344                {
1345                slotB -= md->name_entry_size;
1346                if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1347                  {
1348                  offset = GET2(slotB, 0) << 1;
1349                  condition = offset < offset_top &&
1350                    md->offset_vector[offset] >= 0;
1351                  if (condition) break;
1352                  }
1353                else break;
1354                }
1355    
1356              /* Scan up for duplicates */
1357    
1358              if (!condition)
1359                {
1360                slotB = slotA;
1361                for (i++; i < md->name_count; i++)
1362                  {
1363                  slotB += md->name_entry_size;
1364                  if (STRCMP_UC_UC(slotA + IMM2_SIZE, slotB + IMM2_SIZE) == 0)
1365                    {
1366                    offset = GET2(slotB, 0) << 1;
1367                    condition = offset < offset_top &&
1368                      md->offset_vector[offset] >= 0;
1369                    if (condition) break;
1370                    }
1371                  else break;
1372                  }
1373                }
1374              }
1375            }
1376    
1377          /* Chose branch according to the condition */
1378    
1379          ecode += condition? 1 + IMM2_SIZE : GET(ecode, 1);
1380        }        }
1381    
1382      else if (ecode[LINK_SIZE+1] == OP_DEF)     /* DEFINE - always false */      else if (condcode == OP_DEF)     /* DEFINE - always false */
1383        {        {
1384        condition = FALSE;        condition = FALSE;
1385        ecode += GET(ecode, 1);        ecode += GET(ecode, 1);
1386        }        }
1387    
1388      /* The condition is an assertion. Call match() to evaluate it - setting      /* The condition is an assertion. Call match() to evaluate it - setting
1389      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
1390      assertion. */      an assertion. */
1391    
1392      else      else
1393        {        {
1394        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL,        md->match_function_type = MATCH_CONDASSERT;
1395            match_condassert, RM3);        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM3);
1396        if (rrc == MATCH_MATCH)        if (rrc == MATCH_MATCH)
1397          {          {
1398            if (md->end_offset_top > offset_top)
1399              offset_top = md->end_offset_top;  /* Captures may have happened */
1400          condition = TRUE;          condition = TRUE;
1401          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);          ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE + 2);
1402          while (*ecode == OP_ALT) ecode += GET(ecode, 1);          while (*ecode == OP_ALT) ecode += GET(ecode, 1);
1403          }          }
1404        else if (rrc != MATCH_NOMATCH)  
1405          /* PCRE doesn't allow the effect of (*THEN) to escape beyond an
1406          assertion; it is therefore treated as NOMATCH. */
1407    
1408          else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
1409          {          {
1410          RRETURN(rrc);         /* Need braces because of following else */          RRETURN(rrc);         /* Need braces because of following else */
1411          }          }
1412        else        else
1413          {          {
1414          condition = FALSE;          condition = FALSE;
1415          ecode += GET(ecode, 1);          ecode += codelink;
1416          }          }
1417        }        }
1418    
1419      /* 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
1420      we can use tail recursion to avoid using another stack frame. If the second      use tail recursion to avoid using another stack frame, except when there is
1421      alternative doesn't exist, we can just plough on. */      unlimited repeat of a possibly empty group. In the latter case, a recursive
1422        call to match() is always required, unless the second alternative doesn't
1423        exist, in which case we can just plough on. Note that, for compatibility
1424        with Perl, the | in a conditional group is NOT treated as creating two
1425        alternatives. If a THEN is encountered in the branch, it propagates out to
1426        the enclosing alternative (unless nested in a deeper set of alternatives,
1427        of course). */
1428    
1429      if (condition || *ecode == OP_ALT)      if (condition || *ecode == OP_ALT)
1430        {        {
1431        ecode += 1 + LINK_SIZE;        if (op != OP_SCOND)
1432        flags = match_tail_recursed | ((op == OP_SCOND)? match_cbegroup : 0);          {
1433        goto TAIL_RECURSE;          ecode += 1 + LINK_SIZE;
1434        }          goto TAIL_RECURSE;
1435            }
1436    
1437          md->match_function_type = MATCH_CBEGROUP;
1438          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM49);
1439          RRETURN(rrc);
1440          }
1441    
1442         /* Condition false & no alternative; continue after the group. */
1443    
1444      else      else
1445        {        {
1446        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
# Line 782  for (;;) Line 1448  for (;;)
1448      break;      break;
1449    
1450    
1451      /* End of the pattern. If we are in a top-level recursion, we should      /* Before OP_ACCEPT there may be any number of OP_CLOSE opcodes,
1452      restore the offsets appropriately and continue from after the call. */      to close any currently open capturing brackets. */
1453    
1454      case OP_END:      case OP_CLOSE:
1455      if (md->recursive != NULL && md->recursive->group_num == 0)      number = GET2(ecode, 1);
1456        offset = number << 1;
1457    
1458    #ifdef PCRE_DEBUG
1459          printf("end bracket %d at *ACCEPT", number);
1460          printf("\n");
1461    #endif
1462    
1463        md->capture_last = number;
1464        if (offset >= md->offset_max) md->offset_overflow = TRUE; else
1465        {        {
1466        recursion_info *rec = md->recursive;        md->offset_vector[offset] =
1467        DPRINTF(("End of pattern in a (?0) recursion\n"));          md->offset_vector[md->offset_end - number];
1468        md->recursive = rec->prevrec;        md->offset_vector[offset+1] = (int)(eptr - md->start_subject);
1469        memmove(md->offset_vector, rec->offset_save,        if (offset_top <= offset) offset_top = offset + 2;
         rec->saved_max * sizeof(int));  
       mstart = rec->save_start;  
       ims = original_ims;  
       ecode = rec->after_call;  
       break;  
1470        }        }
1471        ecode += 1 + IMM2_SIZE;
1472        break;
1473    
1474    
1475        /* End of the pattern, either real or forced. */
1476    
1477        case OP_END:
1478        case OP_ACCEPT:
1479        case OP_ASSERT_ACCEPT:
1480    
1481        /* If we have matched an empty string, fail if not in an assertion and not
1482        in a recursion if either PCRE_NOTEMPTY is set, or if PCRE_NOTEMPTY_ATSTART
1483        is set and we have matched at the start of the subject. In both cases,
1484        backtracking will then try other alternatives, if any. */
1485    
1486        if (eptr == mstart && op != OP_ASSERT_ACCEPT &&
1487             md->recursive == NULL &&
1488             (md->notempty ||
1489               (md->notempty_atstart &&
1490                 mstart == md->start_subject + md->start_offset)))
1491          MRRETURN(MATCH_NOMATCH);
1492    
1493      /* Otherwise, if PCRE_NOTEMPTY is set, fail if we have matched an empty      /* Otherwise, we have a match. */
     string - backtracking will then try other alternatives, if any. */  
1494    
     if (md->notempty && eptr == mstart) RRETURN(MATCH_NOMATCH);  
1495      md->end_match_ptr = eptr;           /* Record where we ended */      md->end_match_ptr = eptr;           /* Record where we ended */
1496      md->end_offset_top = offset_top;    /* and how many extracts were taken */      md->end_offset_top = offset_top;    /* and how many extracts were taken */
1497      md->start_match_ptr = mstart;  /* and the start (\K can modify) */      md->start_match_ptr = mstart;       /* and the start (\K can modify) */
     RRETURN(MATCH_MATCH);  
1498    
1499      /* Change option settings */      /* For some reason, the macros don't work properly if an expression is
1500        given as the argument to MRRETURN when the heap is in use. */
1501    
1502      case OP_OPT:      rrc = (op == OP_END)? MATCH_MATCH : MATCH_ACCEPT;
1503      ims = ecode[1];      MRRETURN(rrc);
     ecode += 2;  
     DPRINTF(("ims set to %02lx\n", ims));  
     break;  
1504    
1505      /* Assertion brackets. Check the alternative branches in turn - the      /* Assertion brackets. Check the alternative branches in turn - the
1506      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,
1507      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
1508      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
1509      this level is identical to the lookahead case. */      this level is identical to the lookahead case. When the assertion is part
1510        of a condition, we want to return immediately afterwards. The caller of
1511        this incarnation of the match() function will have set MATCH_CONDASSERT in
1512        md->match_function type, and one of these opcodes will be the first opcode
1513        that is processed. We use a local variable that is preserved over calls to
1514        match() to remember this case. */
1515    
1516      case OP_ASSERT:      case OP_ASSERT:
1517      case OP_ASSERTBACK:      case OP_ASSERTBACK:
1518        if (md->match_function_type == MATCH_CONDASSERT)
1519          {
1520          condassert = TRUE;
1521          md->match_function_type = 0;
1522          }
1523        else condassert = FALSE;
1524    
1525      do      do
1526        {        {
1527        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM4);
1528          RM4);        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
1529        if (rrc == MATCH_MATCH) break;          {
1530        if (rrc != MATCH_NOMATCH) RRETURN(rrc);          mstart = md->start_match_ptr;   /* In case \K reset it */
1531            markptr = md->mark;
1532            break;
1533            }
1534    
1535          /* PCRE does not allow THEN to escape beyond an assertion; it is treated
1536          as NOMATCH. */
1537    
1538          if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
1539        ecode += GET(ecode, 1);        ecode += GET(ecode, 1);
1540        }        }
1541      while (*ecode == OP_ALT);      while (*ecode == OP_ALT);
1542      if (*ecode == OP_KET) RRETURN(MATCH_NOMATCH);  
1543        if (*ecode == OP_KET) MRRETURN(MATCH_NOMATCH);
1544    
1545      /* If checking an assertion for a condition, return MATCH_MATCH. */      /* If checking an assertion for a condition, return MATCH_MATCH. */
1546    
1547      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);      if (condassert) RRETURN(MATCH_MATCH);
1548    
1549      /* Continue from after the assertion, updating the offsets high water      /* Continue from after the assertion, updating the offsets high water
1550      mark, since extracts may have been taken during the assertion. */      mark, since extracts may have been taken during the assertion. */
# Line 847  for (;;) Line 1554  for (;;)
1554      offset_top = md->end_offset_top;      offset_top = md->end_offset_top;
1555      continue;      continue;
1556    
1557      /* Negative assertion: all branches must fail to match */      /* Negative assertion: all branches must fail to match. Encountering SKIP,
1558        PRUNE, or COMMIT means we must assume failure without checking subsequent
1559        branches. */
1560    
1561      case OP_ASSERT_NOT:      case OP_ASSERT_NOT:
1562      case OP_ASSERTBACK_NOT:      case OP_ASSERTBACK_NOT:
1563        if (md->match_function_type == MATCH_CONDASSERT)
1564          {
1565          condassert = TRUE;
1566          md->match_function_type = 0;
1567          }
1568        else condassert = FALSE;
1569    
1570      do      do
1571        {        {
1572        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, 0,        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, NULL, RM5);
1573          RM5);        if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT) MRRETURN(MATCH_NOMATCH);
1574        if (rrc == MATCH_MATCH) RRETURN(MATCH_NOMATCH);        if (rrc == MATCH_SKIP || rrc == MATCH_PRUNE || rrc == MATCH_COMMIT)
1575        if (rrc != MATCH_NOMATCH) RRETURN(rrc);          {
1576            do ecode += GET(ecode,1); while (*ecode == OP_ALT);
1577            break;
1578            }
1579    
1580          /* PCRE does not allow THEN to escape beyond an assertion; it is treated
1581          as NOMATCH. */
1582    
1583          if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN) RRETURN(rrc);
1584        ecode += GET(ecode,1);        ecode += GET(ecode,1);
1585        }        }
1586      while (*ecode == OP_ALT);      while (*ecode == OP_ALT);
1587    
1588      if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH);      if (condassert) RRETURN(MATCH_MATCH);  /* Condition assertion */
1589    
1590      ecode += 1 + LINK_SIZE;      ecode += 1 + LINK_SIZE;
1591      continue;      continue;
# Line 873  for (;;) Line 1597  for (;;)
1597    
1598      case OP_REVERSE:      case OP_REVERSE:
1599  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
1600      if (utf8)      if (utf)
1601        {        {
1602        i = GET(ecode, 1);        i = GET(ecode, 1);
1603        while (i-- > 0)        while (i-- > 0)
1604          {          {
1605          eptr--;          eptr--;
1606          if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);          if (eptr < md->start_subject) MRRETURN(MATCH_NOMATCH);
1607          BACKCHAR(eptr)          BACKCHAR(eptr);
1608          }          }
1609        }        }
1610      else      else
# Line 890  for (;;) Line 1614  for (;;)
1614    
1615        {        {
1616        eptr -= GET(ecode, 1);        eptr -= GET(ecode, 1);
1617        if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH);        if (eptr < md->start_subject) MRRETURN(MATCH_NOMATCH);
1618        }        }
1619    
1620      /* Skip to next op code */      /* Save the earliest consulted character, then skip to next op code */
1621    
1622        if (eptr < md->start_used_ptr) md->start_used_ptr = eptr;
1623      ecode += 1 + LINK_SIZE;      ecode += 1 + LINK_SIZE;
1624      break;      break;
1625    
# Line 906  for (;;) Line 1631  for (;;)
1631      if (pcre_callout != NULL)      if (pcre_callout != NULL)
1632        {        {
1633        pcre_callout_block cb;        pcre_callout_block cb;
1634        cb.version          = 1;   /* Version 1 of the callout block */        cb.version          = 2;   /* Version 1 of the callout block */
1635        cb.callout_number   = ecode[1];        cb.callout_number   = ecode[1];
1636        cb.offset_vector    = md->offset_vector;        cb.offset_vector    = md->offset_vector;
1637        cb.subject          = (PCRE_SPTR)md->start_subject;        cb.subject          = (PCRE_SPTR)md->start_subject;
1638        cb.subject_length   = md->end_subject - md->start_subject;        cb.subject_length   = (int)(md->end_subject - md->start_subject);
1639        cb.start_match      = mstart - md->start_subject;        cb.start_match      = (int)(mstart - md->start_subject);
1640        cb.current_position = eptr - md->start_subject;        cb.current_position = (int)(eptr - md->start_subject);
1641        cb.pattern_position = GET(ecode, 2);        cb.pattern_position = GET(ecode, 2);
1642        cb.next_item_length = GET(ecode, 2 + LINK_SIZE);        cb.next_item_length = GET(ecode, 2 + LINK_SIZE);
1643        cb.capture_top      = offset_top/2;        cb.capture_top      = offset_top/2;
1644        cb.capture_last     = md->capture_last;        cb.capture_last     = md->capture_last;
1645        cb.callout_data     = md->callout_data;        cb.callout_data     = md->callout_data;
1646        if ((rrc = (*pcre_callout)(&cb)) > 0) RRETURN(MATCH_NOMATCH);        cb.mark             = (unsigned char *)markptr;
1647          if ((rrc = (*pcre_callout)(&cb)) > 0) MRRETURN(MATCH_NOMATCH);
1648        if (rrc < 0) RRETURN(rrc);        if (rrc < 0) RRETURN(rrc);
1649        }        }
1650      ecode += 2 + 2*LINK_SIZE;      ecode += 2 + 2*LINK_SIZE;
# Line 928  for (;;) Line 1654  for (;;)
1654      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
1655      whole pattern. (This is so that it works from duplicated subpatterns.)      whole pattern. (This is so that it works from duplicated subpatterns.)
1656    
1657      If there are any capturing brackets started but not finished, we have to      The state of the capturing groups is preserved over recursion, and
1658      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
1659      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
1660      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
1661      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
1662      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
1663      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.  
1664    
1665      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
1666      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
1667      for the original version of this logic. */      for the original version of this logic. It has, however, been hacked around
1668        a lot, so he is not to blame for the current way it works. */
1669    
1670      case OP_RECURSE:      case OP_RECURSE:
1671        {        {
1672          recursion_info *ri;
1673          int recno;
1674    
1675        callpat = md->start_code + GET(ecode, 1);        callpat = md->start_code + GET(ecode, 1);
1676        new_recursive.group_num = (callpat == md->start_code)? 0 :        recno = (callpat == md->start_code)? 0 :
1677          GET2(callpat, 1 + LINK_SIZE);          GET2(callpat, 1 + LINK_SIZE);
1678    
1679          /* Check for repeating a recursion without advancing the subject pointer.
1680          This should catch convoluted mutual recursions. (Some simple cases are
1681          caught at compile time.) */
1682    
1683          for (ri = md->recursive; ri != NULL; ri = ri->prevrec)
1684            if (recno == ri->group_num && eptr == ri->subject_position)
1685              RRETURN(PCRE_ERROR_RECURSELOOP);
1686    
1687        /* Add to "recursing stack" */        /* Add to "recursing stack" */
1688    
1689          new_recursive.group_num = recno;
1690          new_recursive.subject_position = eptr;
1691        new_recursive.prevrec = md->recursive;        new_recursive.prevrec = md->recursive;
1692        md->recursive = &new_recursive;        md->recursive = &new_recursive;
1693    
1694        /* Find where to continue from afterwards */        /* Where to continue from afterwards */
1695    
1696        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
       new_recursive.after_call = ecode;  
1697    
1698        /* Now save the offset data. */        /* Now save the offset data */
1699    
1700        new_recursive.saved_max = md->offset_end;        new_recursive.saved_max = md->offset_end;
1701        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)        if (new_recursive.saved_max <= REC_STACK_SAVE_MAX)
# Line 970  for (;;) Line 1706  for (;;)
1706            (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int));            (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int));
1707          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);          if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY);
1708          }          }
   
1709        memcpy(new_recursive.offset_save, md->offset_vector,        memcpy(new_recursive.offset_save, md->offset_vector,
1710              new_recursive.saved_max * sizeof(int));              new_recursive.saved_max * sizeof(int));
       new_recursive.save_start = mstart;  
       mstart = eptr;  
1711    
1712        /* OK, now we can do the recursion. For each top-level alternative we        /* OK, now we can do the recursion. After processing each alternative,
1713        restore the offset and recursion data. */        restore the offset data. If there were nested recursions, md->recursive
1714          might be changed, so reset it before looping. */
1715    
1716        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));        DPRINTF(("Recursing into group %d\n", new_recursive.group_num));
1717        flags = (*callpat >= OP_SBRA)? match_cbegroup : 0;        cbegroup = (*callpat >= OP_SBRA);
1718        do        do
1719          {          {
1720          RMATCH(eptr, callpat + _pcre_OP_lengths[*callpat], offset_top,          if (cbegroup) md->match_function_type = MATCH_CBEGROUP;
1721            md, ims, eptrb, flags, RM6);          RMATCH(eptr, callpat + PRIV(OP_lengths)[*callpat], offset_top,
1722          if (rrc == MATCH_MATCH)            md, eptrb, RM6);
1723            memcpy(md->offset_vector, new_recursive.offset_save,
1724                new_recursive.saved_max * sizeof(int));
1725            md->recursive = new_recursive.prevrec;
1726            if (rrc == MATCH_MATCH || rrc == MATCH_ACCEPT)
1727            {            {
1728            DPRINTF(("Recursion matched\n"));            DPRINTF(("Recursion matched\n"));
           md->recursive = new_recursive.prevrec;  
1729            if (new_recursive.offset_save != stacksave)            if (new_recursive.offset_save != stacksave)
1730              (pcre_free)(new_recursive.offset_save);              (pcre_free)(new_recursive.offset_save);
1731            RRETURN(MATCH_MATCH);  
1732              /* Set where we got to in the subject, and reset the start in case
1733              it was changed by \K. This *is* propagated back out of a recursion,
1734              for Perl compatibility. */
1735    
1736              eptr = md->end_match_ptr;
1737              mstart = md->start_match_ptr;
1738              goto RECURSION_MATCHED;        /* Exit loop; end processing */
1739            }            }
1740          else if (rrc != MATCH_NOMATCH)  
1741            /* PCRE does not allow THEN to escape beyond a recursion; it is treated
1742            as NOMATCH. */
1743    
1744            else if (rrc != MATCH_NOMATCH && rrc != MATCH_THEN)
1745            {            {
1746            DPRINTF(("Recursion gave error %d\n", rrc));            DPRINTF(("Recursion gave error %d\n", rrc));
1747              if (new_recursive.offset_save != stacksave)
1748                (pcre_free)(new_recursive.offset_save);
1749            RRETURN(rrc);            RRETURN(rrc);
1750            }            }
1751    
1752          md->recursive = &new_recursive;          md->recursive = &new_recursive;
         memcpy(md->offset_vector, new_recursive.offset_save,  
             new_recursive.saved_max * sizeof(int));  
1753          callpat += GET(callpat, 1);          callpat += GET(callpat, 1);
1754          }          }
1755        while (*callpat == OP_ALT);        while (*callpat == OP_ALT);
# Line 1010  for (;;) Line 1758  for (;;)
1758        md->recursive = new_recursive.prevrec;        md->recursive = new_recursive.prevrec;
1759        if (new_recursive.offset_save != stacksave)        if (new_recursive.offset_save != stacksave)
1760          (pcre_free)(new_recursive.offset_save);          (pcre_free)(new_recursive.offset_save);
1761        RRETURN(MATCH_NOMATCH);        MRRETURN(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. */  
   
     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) break;  
       if (rrc != MATCH_NOMATCH) 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));  
1762        }        }
1763    
1764      if (*ecode == OP_KETRMIN)      RECURSION_MATCHED:
1765        {      break;
       RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0,  
         RM8);  
       if (rrc != MATCH_NOMATCH) RRETURN(rrc);  
       ecode = prev;  
       flags = match_tail_recursed;  
       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 = match_tail_recursed;  
       goto TAIL_RECURSE;  
       }  
     /* Control never gets here */  
1766    
1767      /* 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
1768      bracketed group and go to there. */      bracketed group and go to there. */
# Line 1097  for (;;) Line 1771  for (;;)
1771      do ecode += GET(ecode,1); while (*ecode == OP_ALT);      do ecode += GET(ecode,1); while (*ecode == OP_ALT);
1772      break;      break;
1773    
1774      /* BRAZERO and BRAMINZERO occur just before a bracket group, indicating      /* BRAZERO, BRAMINZERO and SKIPZERO occur just before a bracket group,
1775      that it may occur zero times. It may repeat infinitely, or not at all -      indicating that it may occur zero times. It may repeat infinitely, or not
1776      i.e. it could be ()* or ()? in the pattern. Brackets with fixed upper      at all - i.e. it could be ()* or ()? or even (){0} in the pattern. Brackets
1777      repeat limits are compiled as a number of copies, with the optional ones      with fixed upper repeat limits are compiled as a number of copies, with the
1778      preceded by BRAZERO or BRAMINZERO. */      optional ones preceded by BRAZERO or BRAMINZERO. */
1779    
1780      case OP_BRAZERO:      case OP_BRAZERO:
1781        {      next = ecode + 1;
1782        next = ecode+1;      RMATCH(eptr, next, offset_top, md, eptrb, RM10);
1783        RMATCH(eptr, next, offset_top, md, ims, eptrb, 0, RM10);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1784        if (rrc != MATCH_NOMATCH) RRETURN(rrc);      do next += GET(next, 1); while (*next == OP_ALT);
1785        do next += GET(next,1); while (*next == OP_ALT);      ecode = next + 1 + LINK_SIZE;
       ecode = next + 1 + LINK_SIZE;  
       }  
1786      break;      break;
1787    
1788      case OP_BRAMINZERO:      case OP_BRAMINZERO:
1789        {      next = ecode + 1;
1790        next = ecode+1;      do next += GET(next, 1); while (*next == OP_ALT);
1791        do next += GET(next, 1); while (*next == OP_ALT);      RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, eptrb, RM11);
1792        RMATCH(eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0, RM11);      if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1793        if (rrc != MATCH_NOMATCH) RRETURN(rrc);      ecode++;
1794        ecode++;      break;
1795        }  
1796        case OP_SKIPZERO:
1797        next = ecode+1;
1798        do next += GET(next,1); while (*next == OP_ALT);
1799        ecode = next + 1 + LINK_SIZE;
1800      break;      break;
1801    
1802        /* BRAPOSZERO occurs before a possessive bracket group. Don't do anything
1803        here; just jump to the group, with allow_zero set TRUE. */
1804    
1805        case OP_BRAPOSZERO:
1806        op = *(++ecode);
1807        allow_zero = TRUE;
1808        if (op == OP_CBRAPOS || op == OP_SCBRAPOS) goto POSSESSIVE_CAPTURE;
1809          goto POSSESSIVE_NON_CAPTURE;
1810    
1811      /* End of a group, repeated or non-repeating. */      /* End of a group, repeated or non-repeating. */
1812    
1813      case OP_KET:      case OP_KET:
1814      case OP_KETRMIN:      case OP_KETRMIN:
1815      case OP_KETRMAX:      case OP_KETRMAX:
1816        case OP_KETRPOS:
1817      prev = ecode - GET(ecode, 1);      prev = ecode - GET(ecode, 1);
1818    
1819      /* 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
1820      infinite repeats of empty string matches, retrieve the subject start from      infinite repeats of empty string matches, retrieve the subject start from
1821      the chain. Otherwise, set it NULL. */      the chain. Otherwise, set it NULL. */
1822    
1823      if (*prev >= OP_SBRA)      if (*prev >= OP_SBRA || *prev == OP_ONCE)
1824        {        {
1825        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */        saved_eptr = eptrb->epb_saved_eptr;   /* Value at start of group */
1826        eptrb = eptrb->epb_prev;              /* Backup to previous group */        eptrb = eptrb->epb_prev;              /* Backup to previous group */
1827        }        }
1828      else saved_eptr = NULL;      else saved_eptr = NULL;
1829    
1830      /* If we are at the end of an assertion group, stop matching and return      /* If we are at the end of an assertion group or a non-capturing atomic
1831      MATCH_MATCH, but record the current high water mark for use by positive      group, stop matching and return MATCH_MATCH, but record the current high
1832      assertions. Do this also for the "once" (atomic) groups. */      water mark for use by positive assertions. We also need to record the match
1833        start in case it was changed by \K. */
1834      if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT ||  
1835          *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT ||      if ((*prev >= OP_ASSERT && *prev <= OP_ASSERTBACK_NOT) ||
1836          *prev == OP_ONCE)           *prev == OP_ONCE_NC)
1837        {        {
1838        md->end_match_ptr = eptr;      /* For ONCE */        md->end_match_ptr = eptr;      /* For ONCE_NC */
1839        md->end_offset_top = offset_top;        md->end_offset_top = offset_top;
1840        RRETURN(MATCH_MATCH);        md->start_match_ptr = mstart;
1841          MRRETURN(MATCH_MATCH);         /* Sets md->mark */
1842        }        }
1843    
1844      /* 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
1845      and if necessary complete handling an extraction by setting the offsets and      and if necessary complete handling an extraction by setting the offsets and
1846      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
1847      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
1848      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
1849        the current subject position and start match pointer and give a MATCH
1850        return. */
1851    
1852      if (*prev == OP_CBRA || *prev == OP_SCBRA)      if (*prev == OP_CBRA || *prev == OP_SCBRA ||
1853            *prev == OP_CBRAPOS || *prev == OP_SCBRAPOS)
1854        {        {
1855        number = GET2(prev, 1+LINK_SIZE);        number = GET2(prev, 1+LINK_SIZE);
1856        offset = number << 1;        offset = number << 1;
1857    
1858  #ifdef DEBUG  #ifdef PCRE_DEBUG
1859        printf("end bracket %d", number);        printf("end bracket %d", number);
1860        printf("\n");        printf("\n");
1861  #endif  #endif
1862    
1863          /* Handle a recursively called group. */
1864    
1865          if (md->recursive != NULL && md->recursive->group_num == number)
1866            {
1867            md->end_match_ptr = eptr;
1868            md->start_match_ptr = mstart;
1869            RRETURN(MATCH_MATCH);
1870            }
1871    
1872          /* Deal with capturing */
1873    
1874        md->capture_last = number;        md->capture_last = number;
1875        if (offset >= md->offset_max) md->offset_overflow = TRUE; else        if (offset >= md->offset_max) md->offset_overflow = TRUE; else
1876          {          {
1877            /* If offset is greater than offset_top, it means that we are
1878            "skipping" a capturing group, and that group's offsets must be marked
1879            unset. In earlier versions of PCRE, all the offsets were unset at the
1880            start of matching, but this doesn't work because atomic groups and
1881            assertions can cause a value to be set that should later be unset.
1882            Example: matching /(?>(a))b|(a)c/ against "ac". This sets group 1 as
1883            part of the atomic group, but this is not on the final matching path,
1884            so must be unset when 2 is set. (If there is no group 2, there is no
1885            problem, because offset_top will then be 2, indicating no capture.) */
1886    
1887            if (offset > offset_top)
1888              {
1889              register int *iptr = md->offset_vector + offset_top;
1890              register int *iend = md->offset_vector + offset;
1891              while (iptr < iend) *iptr++ = -1;
1892              }
1893    
1894            /* Now make the extraction */
1895    
1896          md->offset_vector[offset] =          md->offset_vector[offset] =
1897            md->offset_vector[md->offset_end - number];            md->offset_vector[md->offset_end - number];
1898          md->offset_vector[offset+1] = eptr - md->start_subject;          md->offset_vector[offset+1] = (int)(eptr - md->start_subject);
1899          if (offset_top <= offset) offset_top = offset + 2;          if (offset_top <= offset) offset_top = offset + 2;
1900          }          }
1901          }
1902    
1903        /* Handle a recursively called group. Restore the offsets      /* For an ordinary non-repeating ket, just continue at this level. This
1904        appropriately and continue from after the call. */      also happens for a repeating ket if no characters were matched in the
1905        group. This is the forcible breaking of infinite loops as implemented in
1906        Perl 5.005. For a non-repeating atomic group that includes captures,
1907        establish a backup point by processing the rest of the pattern at a lower
1908        level. If this results in a NOMATCH return, pass MATCH_ONCE back to the
1909        original OP_ONCE level, thereby bypassing intermediate backup points, but
1910        resetting any captures that happened along the way. */
1911    
1912        if (md->recursive != NULL && md->recursive->group_num == number)      if (*ecode == OP_KET || eptr == saved_eptr)
1913          {
1914          if (*prev == OP_ONCE)
1915          {          {
1916          recursion_info *rec = md->recursive;          RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM12);
1917          DPRINTF(("Recursion (%d) succeeded - continuing\n", number));          if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1918          md->recursive = rec->prevrec;          md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
1919          mstart = rec->save_start;          RRETURN(MATCH_ONCE);
         memcpy(md->offset_vector, rec->offset_save,  
           rec->saved_max * sizeof(int));  
         ecode = rec->after_call;  
         ims = original_ims;  
         break;  
1920          }          }
1921          ecode += 1 + LINK_SIZE;    /* Carry on at this level */
1922          break;
1923        }        }
1924    
1925      /* For both capturing and non-capturing groups, reset the value of the ims      /* OP_KETRPOS is a possessive repeating ket. Remember the current position,
1926      flags, in case they got changed during the group. */      and return the MATCH_KETRPOS. This makes it possible to do the repeats one
1927        at a time from the outer level, thus saving stack. */
     ims = original_ims;  
     DPRINTF(("ims reset to %02lx\n", ims));  
1928    
1929      /* For a non-repeating ket, just continue at this level. This also      if (*ecode == OP_KETRPOS)
     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)  
1930        {        {
1931        ecode += 1 + LINK_SIZE;        md->end_match_ptr = eptr;
1932        break;        md->end_offset_top = offset_top;
1933          RRETURN(MATCH_KETRPOS);
1934        }        }
1935    
1936      /* 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
1937      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
1938      tail recursion to avoid using another stack frame. */      use tail recursion to avoid using another stack frame, unless we have an
1939        an atomic group or an unlimited repeat of a group that can match an empty
1940      flags = (*prev >= OP_SBRA)? match_cbegroup : 0;      string. */
1941    
1942      if (*ecode == OP_KETRMIN)      if (*ecode == OP_KETRMIN)
1943        {        {
1944        RMATCH(eptr, ecode + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0,        RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM7);
         RM12);  
1945        if (rrc != MATCH_NOMATCH) RRETURN(rrc);        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1946          if (*prev == OP_ONCE)
1947            {
1948            RMATCH(eptr, prev, offset_top, md, eptrb, RM8);
1949            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1950            md->once_target = prev;  /* Level at which to change to MATCH_NOMATCH */
1951            RRETURN(MATCH_ONCE);
1952            }
1953          if (*prev >= OP_SBRA)    /* Could match an empty string */
1954            {
1955            md->match_function_type = MATCH_CBEGROUP;
1956            RMATCH(eptr, prev, offset_top, md, eptrb, RM50);
1957            RRETURN(rrc);
1958            }
1959        ecode = prev;        ecode = prev;
       flags |= match_tail_recursed;  
1960        goto TAIL_RECURSE;        goto TAIL_RECURSE;
1961        }        }
1962      else  /* OP_KETRMAX */      else  /* OP_KETRMAX */
1963        {        {
1964        RMATCH(eptr, prev, offset_top, md, ims, eptrb, flags, RM13);        if (*prev >= OP_SBRA) md->match_function_type = MATCH_CBEGROUP;
1965          RMATCH(eptr, prev, offset_top, md, eptrb, RM13);
1966          if (rrc == MATCH_ONCE && md->once_target == prev) rrc = MATCH_NOMATCH;
1967        if (rrc != MATCH_NOMATCH) RRETURN(rrc);        if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1968          if (*prev == OP_ONCE)
1969            {
1970            RMATCH(eptr, ecode + 1 + LINK_SIZE, offset_top, md, eptrb, RM9);
1971            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
1972            md->once_target = prev;
1973            RRETURN(MATCH_ONCE);
1974            }
1975        ecode += 1 + LINK_SIZE;        ecode += 1 + LINK_SIZE;
       flags = match_tail_recursed;  
1976        goto TAIL_RECURSE;        goto TAIL_RECURSE;
1977        }        }
1978      /* Control never gets here */      /* Control never gets here */
1979    
1980      /* Start of subject unless notbol, or after internal newline if multiline */      /* Not multiline mode: start of subject assertion, unless notbol. */
1981    
1982      case OP_CIRC:      case OP_CIRC:
1983      if (md->notbol && eptr == md->start_subject) RRETURN(MATCH_NOMATCH);      if (md->notbol && eptr == md->start_subject) MRRETURN(MATCH_NOMATCH);
     if ((ims & PCRE_MULTILINE) != 0)  
       {  
       if (eptr != md->start_subject &&  
           (eptr == md->end_subject || !WAS_NEWLINE(eptr)))  
         RRETURN(MATCH_NOMATCH);  
       ecode++;  
       break;  
       }  
     /* ... else fall through */  
1984    
1985      /* Start of subject assertion */      /* Start of subject assertion */
1986    
1987      case OP_SOD:      case OP_SOD:
1988      if (eptr != md->start_subject) RRETURN(MATCH_NOMATCH);      if (eptr != md->start_subject) MRRETURN(MATCH_NOMATCH);
1989        ecode++;
1990        break;
1991    
1992        /* Multiline mode: start of subject unless notbol, or after any newline. */
1993    
1994        case OP_CIRCM:
1995        if (md->notbol && eptr == md->start_subject) MRRETURN(MATCH_NOMATCH);
1996        if (eptr != md->start_subject &&
1997            (eptr == md->end_subject || !WAS_NEWLINE(eptr)))
1998          MRRETURN(MATCH_NOMATCH);
1999      ecode++;      ecode++;
2000      break;      break;
2001    
2002      /* Start of match assertion */      /* Start of match assertion */
2003    
2004      case OP_SOM:      case OP_SOM:
2005      if (eptr != md->start_subject + md->start_offset) RRETURN(MATCH_NOMATCH);      if (eptr != md->start_subject + md->start_offset) MRRETURN(MATCH_NOMATCH);
2006      ecode++;      ecode++;
2007      break;      break;
2008    
# Line 1274  for (;;) Line 2013  for (;;)
2013      ecode++;      ecode++;
2014      break;      break;
2015    
2016      /* Assert before internal newline if multiline, or before a terminating      /* Multiline mode: assert before any newline, or before end of subject
2017      newline unless endonly is set, else end of subject unless noteol is set. */      unless noteol is set. */
2018    
2019      case OP_DOLL:      case OP_DOLLM:
2020      if ((ims & PCRE_MULTILINE) != 0)      if (eptr < md->end_subject)
2021        {        { if (!IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH); }
       if (eptr < md->end_subject)  
         { if (!IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH); }  
       else  
         { if (md->noteol) RRETURN(MATCH_NOMATCH); }  
       ecode++;  
       break;  
       }  
2022      else      else
2023        {        {
2024        if (md->noteol) RRETURN(MATCH_NOMATCH);        if (md->noteol) MRRETURN(MATCH_NOMATCH);
2025        if (!md->endonly)        SCHECK_PARTIAL();
         {  
         if (eptr != md->end_subject &&  
             (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))  
           RRETURN(MATCH_NOMATCH);  
         ecode++;  
         break;  
         }  
2026        }        }
2027        ecode++;
2028        break;
2029    
2030        /* Not multiline mode: assert before a terminating newline or before end of
2031        subject unless noteol is set. */
2032    
2033        case OP_DOLL:
2034        if (md->noteol) MRRETURN(MATCH_NOMATCH);
2035        if (!md->endonly) goto ASSERT_NL_OR_EOS;
2036    
2037      /* ... else fall through for endonly */      /* ... else fall through for endonly */
2038    
2039      /* End of subject assertion (\z) */      /* End of subject assertion (\z) */
2040    
2041      case OP_EOD:      case OP_EOD:
2042      if (eptr < md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr < md->end_subject) MRRETURN(MATCH_NOMATCH);
2043        SCHECK_PARTIAL();
2044      ecode++;      ecode++;
2045      break;      break;
2046    
2047      /* End of subject or ending \n assertion (\Z) */      /* End of subject or ending \n assertion (\Z) */
2048    
2049      case OP_EODN:      case OP_EODN:
2050      if (eptr != md->end_subject &&      ASSERT_NL_OR_EOS:
2051        if (eptr < md->end_subject &&
2052          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))          (!IS_NEWLINE(eptr) || eptr != md->end_subject - md->nllen))
2053        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2054    
2055        /* Either at end of string or \n before end. */
2056    
2057        SCHECK_PARTIAL();
2058      ecode++;      ecode++;
2059      break;      break;
2060    
# Line 1325  for (;;) Line 2066  for (;;)
2066    
2067        /* Find out if the previous and current characters are "word" characters.        /* Find out if the previous and current characters are "word" characters.
2068        It takes a bit more work in UTF-8 mode. Characters > 255 are assumed to        It takes a bit more work in UTF-8 mode. Characters > 255 are assumed to
2069        be "non-word" characters. */        be "non-word" characters. Remember the earliest consulted character for
2070          partial matching. */
2071    
2072  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2073        if (utf8)        if (utf)
2074          {          {
2075            /* Get status of previous character */
2076    
2077          if (eptr == md->start_subject) prev_is_word = FALSE; else          if (eptr == md->start_subject) prev_is_word = FALSE; else
2078            {            {
2079            const uschar *lastptr = eptr - 1;            PCRE_PUCHAR lastptr = eptr - 1;
2080            while((*lastptr & 0xc0) == 0x80) lastptr--;            BACKCHAR(lastptr);
2081              if (lastptr < md->start_used_ptr) md->start_used_ptr = lastptr;
2082            GETCHAR(c, lastptr);            GETCHAR(c, lastptr);
2083    #ifdef SUPPORT_UCP
2084              if (md->use_ucp)
2085                {
2086                if (c == '_') prev_is_word = TRUE; else
2087                  {
2088                  int cat = UCD_CATEGORY(c);
2089                  prev_is_word = (cat == ucp_L || cat == ucp_N);
2090                  }
2091                }
2092              else
2093    #endif
2094            prev_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;            prev_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;
2095            }            }
2096          if (eptr >= md->end_subject) cur_is_word = FALSE; else  
2097            /* Get status of next character */
2098    
2099            if (eptr >= md->end_subject)
2100              {
2101              SCHECK_PARTIAL();
2102              cur_is_word = FALSE;
2103              }
2104            else
2105            {            {
2106            GETCHAR(c, eptr);            GETCHAR(c, eptr);
2107    #ifdef SUPPORT_UCP
2108              if (md->use_ucp)
2109                {
2110                if (c == '_') cur_is_word = TRUE; else
2111                  {
2112                  int cat = UCD_CATEGORY(c);
2113                  cur_is_word = (cat == ucp_L || cat == ucp_N);
2114                  }
2115                }
2116              else
2117    #endif
2118            cur_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;            cur_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0;
2119            }            }
2120          }          }
2121        else        else
2122  #endif  #endif
2123    
2124        /* More streamlined when not in UTF-8 mode */        /* Not in UTF-8 mode, but we may still have PCRE_UCP set, and for
2125          consistency with the behaviour of \w we do use it in this case. */
2126    
2127          {          {
2128          prev_is_word = (eptr != md->start_subject) &&          /* Get status of previous character */
2129            ((md->ctypes[eptr[-1]] & ctype_word) != 0);  
2130          cur_is_word = (eptr < md->end_subject) &&          if (eptr == md->start_subject) prev_is_word = FALSE; else
2131            ((md->ctypes[*eptr] & ctype_word) != 0);            {
2132              if (eptr <= md->start_used_ptr) md->start_used_ptr = eptr - 1;
2133    #ifdef SUPPORT_UCP
2134              if (md->use_ucp)
2135                {
2136                c = eptr[-1];
2137                if (c == '_') prev_is_word = TRUE; else
2138                  {
2139                  int cat = UCD_CATEGORY(c);
2140                  prev_is_word = (cat == ucp_L || cat == ucp_N);
2141                  }
2142                }
2143              else
2144    #endif
2145              prev_is_word = ((md->ctypes[eptr[-1]] & ctype_word) != 0);
2146              }
2147    
2148            /* Get status of next character */
2149    
2150            if (eptr >= md->end_subject)
2151              {
2152              SCHECK_PARTIAL();
2153              cur_is_word = FALSE;
2154              }
2155            else
2156    #ifdef SUPPORT_UCP
2157            if (md->use_ucp)
2158              {
2159              c = *eptr;
2160              if (c == '_') cur_is_word = TRUE; else
2161                {
2162                int cat = UCD_CATEGORY(c);
2163                cur_is_word = (cat == ucp_L || cat == ucp_N);
2164                }
2165              }
2166            else
2167    #endif
2168            cur_is_word = ((md->ctypes[*eptr] & ctype_word) != 0);
2169          }          }
2170    
2171        /* Now see if the situation is what we want */        /* Now see if the situation is what we want */
2172    
2173        if ((*ecode++ == OP_WORD_BOUNDARY)?        if ((*ecode++ == OP_WORD_BOUNDARY)?
2174             cur_is_word == prev_is_word : cur_is_word != prev_is_word)             cur_is_word == prev_is_word : cur_is_word != prev_is_word)
2175          RRETURN(MATCH_NOMATCH);          MRRETURN(MATCH_NOMATCH);
2176        }        }
2177      break;      break;
2178    
2179      /* Match a single character type; inline for speed */      /* Match a single character type; inline for speed */
2180    
2181      case OP_ANY:      case OP_ANY:
2182      if ((ims & PCRE_DOTALL) == 0)      if (IS_NEWLINE(eptr)) MRRETURN(MATCH_NOMATCH);
2183        {      /* Fall through */
2184        if (IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH);  
2185        }      case OP_ALLANY:
2186      if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
2187      if (utf8)        {                            /* not be updated before SCHECK_PARTIAL. */
2188        while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++;        SCHECK_PARTIAL();
2189          MRRETURN(MATCH_NOMATCH);
2190          }
2191        eptr++;
2192    #ifdef SUPPORT_UTF
2193        if (utf) ACROSSCHAR(eptr < md->end_subject, *eptr, eptr++);
2194    #endif
2195      ecode++;      ecode++;
2196      break;      break;
2197    
# Line 1380  for (;;) Line 2199  for (;;)
2199      any byte, even newline, independent of the setting of PCRE_DOTALL. */      any byte, even newline, independent of the setting of PCRE_DOTALL. */
2200    
2201      case OP_ANYBYTE:      case OP_ANYBYTE:
2202      if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)   /* DO NOT merge the eptr++ here; it must */
2203          {                            /* not be updated before SCHECK_PARTIAL. */
2204          SCHECK_PARTIAL();
2205          MRRETURN(MATCH_NOMATCH);
2206          }
2207        eptr++;
2208      ecode++;      ecode++;
2209      break;      break;
2210    
2211      case OP_NOT_DIGIT:      case OP_NOT_DIGIT:
2212      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2213          {
2214          SCHECK_PARTIAL();
2215          MRRETURN(MATCH_NOMATCH);
2216          }
2217      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2218      if (      if (
2219  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1393  for (;;) Line 2221  for (;;)
2221  #endif  #endif
2222         (md->ctypes[c] & ctype_digit) != 0         (md->ctypes[c] & ctype_digit) != 0
2223         )         )
2224        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2225      ecode++;      ecode++;
2226      break;      break;
2227    
2228      case OP_DIGIT:      case OP_DIGIT:
2229      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2230          {
2231          SCHECK_PARTIAL();
2232          MRRETURN(MATCH_NOMATCH);
2233          }
2234      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2235      if (      if (
2236  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1406  for (;;) Line 2238  for (;;)
2238  #endif  #endif
2239         (md->ctypes[c] & ctype_digit) == 0         (md->ctypes[c] & ctype_digit) == 0
2240         )         )
2241        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2242      ecode++;      ecode++;
2243      break;      break;
2244    
2245      case OP_NOT_WHITESPACE:      case OP_NOT_WHITESPACE:
2246      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2247          {
2248          SCHECK_PARTIAL();
2249          MRRETURN(MATCH_NOMATCH);
2250          }
2251      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2252      if (      if (
2253  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1419  for (;;) Line 2255  for (;;)
2255  #endif  #endif
2256         (md->ctypes[c] & ctype_space) != 0         (md->ctypes[c] & ctype_space) != 0
2257         )         )
2258        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2259      ecode++;      ecode++;
2260      break;      break;
2261    
2262      case OP_WHITESPACE:      case OP_WHITESPACE:
2263      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2264          {
2265          SCHECK_PARTIAL();
2266          MRRETURN(MATCH_NOMATCH);
2267          }
2268      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2269      if (      if (
2270  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1432  for (;;) Line 2272  for (;;)
2272  #endif  #endif
2273         (md->ctypes[c] & ctype_space) == 0         (md->ctypes[c] & ctype_space) == 0
2274         )         )
2275        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2276      ecode++;      ecode++;
2277      break;      break;
2278    
2279      case OP_NOT_WORDCHAR:      case OP_NOT_WORDCHAR:
2280      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2281          {
2282          SCHECK_PARTIAL();
2283          MRRETURN(MATCH_NOMATCH);
2284          }
2285      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2286      if (      if (
2287  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1445  for (;;) Line 2289  for (;;)
2289  #endif  #endif
2290         (md->ctypes[c] & ctype_word) != 0         (md->ctypes[c] & ctype_word) != 0
2291         )         )
2292        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2293      ecode++;      ecode++;
2294      break;      break;
2295    
2296      case OP_WORDCHAR:      case OP_WORDCHAR:
2297      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2298          {
2299          SCHECK_PARTIAL();
2300          MRRETURN(MATCH_NOMATCH);
2301          }
2302      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2303      if (      if (
2304  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 1458  for (;;) Line 2306  for (;;)
2306  #endif  #endif
2307         (md->ctypes[c] & ctype_word) == 0         (md->ctypes[c] & ctype_word) == 0
2308         )         )
2309        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2310      ecode++;      ecode++;
2311      break;      break;
2312    
2313      case OP_ANYNL:      case OP_ANYNL:
2314      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2315          {
2316          SCHECK_PARTIAL();
2317          MRRETURN(MATCH_NOMATCH);
2318          }
2319      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2320      switch(c)      switch(c)
2321        {        {
2322        default: RRETURN(MATCH_NOMATCH);        default: MRRETURN(MATCH_NOMATCH);
2323    
2324        case 0x000d:        case 0x000d:
2325        if (eptr < md->end_subject && *eptr == 0x0a) eptr++;        if (eptr < md->end_subject && *eptr == 0x0a) eptr++;
2326        break;        break;
2327    
2328        case 0x000a:        case 0x000a:
2329          break;
2330    
2331        case 0x000b:        case 0x000b:
2332        case 0x000c:        case 0x000c:
2333        case 0x0085:        case 0x0085:
2334        case 0x2028:        case 0x2028:
2335        case 0x2029:        case 0x2029:
2336          if (md->bsr_anycrlf) MRRETURN(MATCH_NOMATCH);
2337        break;        break;
2338        }        }
2339      ecode++;      ecode++;
2340      break;      break;
2341    
2342      case OP_NOT_HSPACE:      case OP_NOT_HSPACE:
2343      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2344          {
2345          SCHECK_PARTIAL();
2346          MRRETURN(MATCH_NOMATCH);
2347          }
2348      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2349      switch(c)      switch(c)
2350        {        {
# Line 1507  for (;;) Line 2368  for (;;)
2368        case 0x202f:    /* NARROW NO-BREAK SPACE */        case 0x202f:    /* NARROW NO-BREAK SPACE */
2369        case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */        case 0x205f:    /* MEDIUM MATHEMATICAL SPACE */
2370        case 0x3000:    /* IDEOGRAPHIC SPACE */        case 0x3000:    /* IDEOGRAPHIC SPACE */
2371        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2372        }        }
2373      ecode++;      ecode++;
2374      break;      break;
2375    
2376      case OP_HSPACE:      case OP_HSPACE:
2377      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2378          {
2379          SCHECK_PARTIAL();
2380          MRRETURN(MATCH_NOMATCH);
2381          }
2382      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2383      switch(c)      switch(c)
2384        {        {
2385        default: RRETURN(MATCH_NOMATCH);        default: MRRETURN(MATCH_NOMATCH);
2386        case 0x09:      /* HT */        case 0x09:      /* HT */
2387        case 0x20:      /* SPACE */        case 0x20:      /* SPACE */
2388        case 0xa0:      /* NBSP */        case 0xa0:      /* NBSP */
# Line 1543  for (;;) Line 2408  for (;;)
2408      break;      break;
2409    
2410      case OP_NOT_VSPACE:      case OP_NOT_VSPACE:
2411      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2412          {
2413          SCHECK_PARTIAL();
2414          MRRETURN(MATCH_NOMATCH);
2415          }
2416      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2417      switch(c)      switch(c)
2418        {        {
# Line 1555  for (;;) Line 2424  for (;;)
2424        case 0x85:      /* NEL */        case 0x85:      /* NEL */
2425        case 0x2028:    /* LINE SEPARATOR */        case 0x2028:    /* LINE SEPARATOR */
2426        case 0x2029:    /* PARAGRAPH SEPARATOR */        case 0x2029:    /* PARAGRAPH SEPARATOR */
2427        RRETURN(MATCH_NOMATCH);        MRRETURN(MATCH_NOMATCH);
2428        }        }
2429      ecode++;      ecode++;
2430      break;      break;
2431    
2432      case OP_VSPACE:      case OP_VSPACE:
2433      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2434          {
2435          SCHECK_PARTIAL();
2436          MRRETURN(MATCH_NOMATCH);
2437          }
2438      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2439      switch(c)      switch(c)
2440        {        {
2441        default: RRETURN(MATCH_NOMATCH);        default: MRRETURN(MATCH_NOMATCH);
2442        case 0x0a:      /* LF */        case 0x0a:      /* LF */
2443        case 0x0b:      /* VT */        case 0x0b:      /* VT */
2444        case 0x0c:      /* FF */        case 0x0c:      /* FF */
# Line 1584  for (;;) Line 2457  for (;;)
2457    
2458      case OP_PROP:      case OP_PROP:
2459      case OP_NOTPROP:      case OP_NOTPROP:
2460      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2461          {
2462          SCHECK_PARTIAL();
2463          MRRETURN(MATCH_NOMATCH);
2464          }
2465      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2466        {        {
2467        int chartype, script;        const ucd_record *prop = GET_UCD(c);
       int category = _pcre_ucp_findprop(c, &chartype, &script);  
2468    
2469        switch(ecode[1])        switch(ecode[1])
2470          {          {
2471          case PT_ANY:          case PT_ANY:
2472          if (op == OP_NOTPROP) RRETURN(MATCH_NOMATCH);          if (op == OP_NOTPROP) MRRETURN(MATCH_NOMATCH);
2473          break;          break;
2474    
2475          case PT_LAMP:          case PT_LAMP:
2476          if ((chartype == ucp_Lu ||          if ((prop->chartype == ucp_Lu ||
2477               chartype == ucp_Ll ||               prop->chartype == ucp_Ll ||
2478               chartype == ucp_Lt) == (op == OP_NOTPROP))               prop->chartype == ucp_Lt) == (op == OP_NOTPROP))
2479            RRETURN(MATCH_NOMATCH);            MRRETURN(MATCH_NOMATCH);
2480           break;          break;
2481    
2482          case PT_GC:          case PT_GC:
2483          if ((ecode[2] != category) == (op == OP_PROP))          if ((ecode[2] != PRIV(ucp_gentype)[prop->chartype]) == (op == OP_PROP))
2484            RRETURN(MATCH_NOMATCH);            MRRETURN(MATCH_NOMATCH);
2485          break;          break;
2486    
2487          case PT_PC:          case PT_PC:
2488          if ((ecode[2] != chartype) == (op == OP_PROP))          if ((ecode[2] != prop->chartype) == (op == OP_PROP))
2489            RRETURN(MATCH_NOMATCH);            MRRETURN(MATCH_NOMATCH);
2490          break;          break;
2491    
2492          case PT_SC:          case PT_SC:
2493          if ((ecode[2] != script) == (op == OP_PROP))          if ((ecode[2] != prop->script) == (op == OP_PROP))
2494            RRETURN(MATCH_NOMATCH);            MRRETURN(MATCH_NOMATCH);
2495          break;          break;
2496    
2497            /* These are specials */
2498    
2499            case PT_ALNUM:
2500            if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2501                 PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (op == OP_NOTPROP))
2502              MRRETURN(MATCH_NOMATCH);
2503            break;
2504    
2505            case PT_SPACE:    /* Perl space */
2506            if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2507                 c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
2508                   == (op == OP_NOTPROP))
2509              MRRETURN(MATCH_NOMATCH);
2510            break;
2511    
2512            case PT_PXSPACE:  /* POSIX space */
2513            if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
2514                 c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
2515                 c == CHAR_FF || c == CHAR_CR)
2516                   == (op == OP_NOTPROP))
2517              MRRETURN(MATCH_NOMATCH);
2518            break;
2519    
2520            case PT_WORD:
2521            if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
2522                 PRIV(ucp_gentype)[prop->chartype] == ucp_N ||
2523                 c == CHAR_UNDERSCORE) == (op == OP_NOTPROP))
2524              MRRETURN(MATCH_NOMATCH);
2525            break;
2526    
2527            /* This should never occur */
2528    
2529          default:          default:
2530          RRETURN(PCRE_ERROR_INTERNAL);          RRETURN(PCRE_ERROR_INTERNAL);
2531          }          }
# Line 1630  for (;;) Line 2538  for (;;)
2538      is in the binary; otherwise a compile-time error occurs. */      is in the binary; otherwise a compile-time error occurs. */
2539    
2540      case OP_EXTUNI:      case OP_EXTUNI:
2541      if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);      if (eptr >= md->end_subject)
2542          {
2543          SCHECK_PARTIAL();
2544          MRRETURN(MATCH_NOMATCH);
2545          }
2546      GETCHARINCTEST(c, eptr);      GETCHARINCTEST(c, eptr);
2547        if (UCD_CATEGORY(c) == ucp_M) MRRETURN(MATCH_NOMATCH);
2548        while (eptr < md->end_subject)
2549        {        {
2550        int chartype, script;        int len = 1;
2551        int category = _pcre_ucp_findprop(c, &chartype, &script);        if (!utf) c = *eptr; else { GETCHARLEN(c, eptr, len); }
2552        if (category == ucp_M) RRETURN(MATCH_NOMATCH);        if (UCD_CATEGORY(c) != ucp_M) break;
2553        while (eptr < md->end_subject)        eptr += len;
         {  
         int len = 1;  
         if (!utf8) c = *eptr; else  
           {  
           GETCHARLEN(c, eptr, len);  
           }  
         category = _pcre_ucp_findprop(c, &chartype, &script);  
         if (category != ucp_M) break;  
         eptr += len;  
         }  
2554        }        }
2555      ecode++;      ecode++;
2556      break;      break;
# Line 1662  for (;;) Line 2566  for (;;)
2566      loops). */      loops). */
2567    
2568      case OP_REF:      case OP_REF:
2569        {      case OP_REFI:
2570        offset = GET2(ecode, 1) << 1;               /* Doubled ref number */      caseless = op == OP_REFI;
2571        ecode += 3;                                 /* Advance past item */      offset = GET2(ecode, 1) << 1;               /* Doubled ref number */
2572        ecode += 1 + IMM2_SIZE;
2573    
2574        /* If the reference is unset, there are two possibilities:
2575    
2576        (a) In the default, Perl-compatible state, set the length negative;
2577        this ensures that every attempt at a match fails. We can't just fail
2578        here, because of the possibility of quantifiers with zero minima.
2579    
2580        (b) If the JavaScript compatibility flag is set, set the length to zero
2581        so that the back reference matches an empty string.
2582    
2583        Otherwise, set the length to the length of what was matched by the
2584        referenced subpattern. */
2585    
2586        /* If the reference is unset, set the length to be longer than the amount      if (offset >= offset_top || md->offset_vector[offset] < 0)
2587        of subject left; this ensures that every attempt at a match fails. We        length = (md->jscript_compat)? 0 : -1;
2588        can't just fail here, because of the possibility of quantifiers with zero      else
2589        minima. */        length = md->offset_vector[offset+1] - md->offset_vector[offset];
   
       length = (offset >= offset_top || md->offset_vector[offset] < 0)?  
         md->end_subject - eptr + 1 :  
         md->offset_vector[offset+1] - md->offset_vector[offset];  
2590    
2591        /* Set up for repetition, or handle the non-repeated case */      /* Set up for repetition, or handle the non-repeated case */
2592    
2593        switch (*ecode)      switch (*ecode)
2594          {        {
2595          case OP_CRSTAR:        case OP_CRSTAR:
2596          case OP_CRMINSTAR:        case OP_CRMINSTAR:
2597          case OP_CRPLUS:        case OP_CRPLUS:
2598          case OP_CRMINPLUS:        case OP_CRMINPLUS:
2599          case OP_CRQUERY:        case OP_CRQUERY:
2600          case OP_CRMINQUERY:        case OP_CRMINQUERY:
2601          c = *ecode++ - OP_CRSTAR;        c = *ecode++ - OP_CRSTAR;
2602          minimize = (c & 1) != 0;        minimize = (c & 1) != 0;
2603          min = rep_min[c];                 /* Pick up values from tables; */        min = rep_min[c];                 /* Pick up values from tables; */
2604          max = rep_max[c];                 /* zero for max => infinity */        max = rep_max[c];                 /* zero for max => infinity */
2605          if (max == 0) max = INT_MAX;        if (max == 0) max = INT_MAX;
2606          break;        break;
2607    
2608          case OP_CRRANGE:        case OP_CRRANGE:
2609          case OP_CRMINRANGE:        case OP_CRMINRANGE:
2610          minimize = (*ecode == OP_CRMINRANGE);        minimize = (*ecode == OP_CRMINRANGE);
2611          min = GET2(ecode, 1);        min = GET2(ecode, 1);
2612          max = GET2(ecode, 3);        max = GET2(ecode, 1 + IMM2_SIZE);
2613          if (max == 0) max = INT_MAX;        if (max == 0) max = INT_MAX;
2614          ecode += 5;        ecode += 1 + 2 * IMM2_SIZE;
2615          break;        break;
2616    
2617          default:               /* No repeat follows */        default:               /* No repeat follows */
2618          if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH);        if ((length = match_ref(offset, eptr, length, md, caseless)) < 0)
2619          eptr += length;          {
2620          continue;              /* With the main loop */          CHECK_PARTIAL();
2621            MRRETURN(MATCH_NOMATCH);
2622          }          }
2623          eptr += length;
2624          continue;              /* With the main loop */
2625          }
2626    
2627        /* If the length of the reference is zero, just continue with the      /* Handle repeated back references. If the length of the reference is
2628        main loop. */      zero, just continue with the main loop. */
2629    
2630        if (length == 0) continue;      if (length == 0) continue;
2631    
2632        /* First, ensure the minimum number of matches are present. We get back      /* First, ensure the minimum number of matches are present. We get back
2633        the length of the reference string explicitly rather than passing the      the length of the reference string explicitly rather than passing the
2634        address of eptr, so that eptr can be a register variable. */      address of eptr, so that eptr can be a register variable. */
2635    
2636        for (i = 1; i <= min; i++)      for (i = 1; i <= min; i++)
2637          {
2638          int slength;
2639          if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
2640          {          {
2641          if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH);          CHECK_PARTIAL();
2642          eptr += length;          MRRETURN(MATCH_NOMATCH);
2643          }          }
2644          eptr += slength;
2645          }
2646    
2647        /* If min = max, continue at the same level without recursion.      /* If min = max, continue at the same level without recursion.
2648        They are not both allowed to be zero. */      They are not both allowed to be zero. */
2649    
2650        if (min == max) continue;      if (min == max) continue;
2651    
2652        /* If minimizing, keep trying and advancing the pointer */      /* If minimizing, keep trying and advancing the pointer */
2653    
2654        if (minimize)      if (minimize)
2655          {
2656          for (fi = min;; fi++)
2657          {          {
2658          for (fi = min;; fi++)          int slength;
2659            RMATCH(eptr, ecode, offset_top, md, eptrb, RM14);
2660            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2661            if (fi >= max) MRRETURN(MATCH_NOMATCH);
2662            if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
2663            {            {
2664            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM14);            CHECK_PARTIAL();
2665            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            MRRETURN(MATCH_NOMATCH);
           if (fi >= max || !match_ref(offset, eptr, length, md, ims))  
             RRETURN(MATCH_NOMATCH);  
           eptr += length;  
2666            }            }
2667          /* Control never gets here */          eptr += slength;
2668          }          }
2669          /* Control never gets here */
2670          }
2671    
2672        /* If maximizing, find the longest string and work backwards */      /* If maximizing, find the longest string and work backwards */
2673    
2674        else      else
2675          {
2676          pp = eptr;
2677          for (i = min; i < max; i++)
2678          {          {
2679          pp = eptr;          int slength;
2680          for (i = min; i < max; i++)          if ((slength = match_ref(offset, eptr, length, md, caseless)) < 0)
           {  
           if (!match_ref(offset, eptr, length, md, ims)) break;  
           eptr += length;  
           }  
         while (eptr >= pp)  
2681            {            {
2682            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM15);            CHECK_PARTIAL();
2683            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            break;
           eptr -= length;  
2684            }            }
2685          RRETURN(MATCH_NOMATCH);          eptr += slength;
2686            }
2687          while (eptr >= pp)
2688            {
2689            RMATCH(eptr, ecode, offset_top, md, eptrb, RM15);
2690            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2691            eptr -= length;
2692          }          }
2693          MRRETURN(MATCH_NOMATCH);
2694        }        }
2695      /* Control never gets here */      /* Control never gets here */
2696    
   
   
2697      /* Match a bit-mapped character class, possibly repeatedly. This op code is      /* Match a bit-mapped character class, possibly repeatedly. This op code is
2698      used when all the characters in the class have values in the range 0-255,      used when all the characters in the class have values in the range 0-255,
2699      and either the matching is caseful, or the characters are in the range      and either the matching is caseful, or the characters are in the range
# Line 1779  for (;;) Line 2708  for (;;)
2708      case OP_NCLASS:      case OP_NCLASS:
2709      case OP_CLASS:      case OP_CLASS:
2710        {        {
2711          /* The data variable is saved across frames, so the byte map needs to
2712          be stored there. */
2713    #define BYTE_MAP ((pcre_uint8 *)data)
2714        data = ecode + 1;                /* Save for matching */        data = ecode + 1;                /* Save for matching */
2715        ecode += 33;                     /* Advance past the item */        ecode += 1 + (32 / sizeof(pcre_uchar)); /* Advance past the item */
2716    
2717        switch (*ecode)        switch (*ecode)
2718          {          {
# Line 1801  for (;;) Line 2733  for (;;)
2733          case OP_CRMINRANGE:          case OP_CRMINRANGE:
2734          minimize = (*ecode == OP_CRMINRANGE);          minimize = (*ecode == OP_CRMINRANGE);
2735          min = GET2(ecode, 1);          min = GET2(ecode, 1);
2736          max = GET2(ecode, 3);          max = GET2(ecode, 1 + IMM2_SIZE);
2737          if (max == 0) max = INT_MAX;          if (max == 0) max = INT_MAX;
2738          ecode += 5;          ecode += 1 + 2 * IMM2_SIZE;
2739          break;          break;
2740    
2741          default:               /* No repeat follows */          default:               /* No repeat follows */
# Line 1813  for (;;) Line 2745  for (;;)
2745    
2746        /* First, ensure the minimum number of matches are present. */        /* First, ensure the minimum number of matches are present. */
2747    
2748  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2749        /* UTF-8 mode */        if (utf)
       if (utf8)  
2750          {          {
2751          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
2752            {            {
2753            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);            if (eptr >= md->end_subject)
2754                {
2755                SCHECK_PARTIAL();
2756                MRRETURN(MATCH_NOMATCH);
2757                }
2758            GETCHARINC(c, eptr);            GETCHARINC(c, eptr);
2759            if (c > 255)            if (c > 255)
2760              {              {
2761              if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);              if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);
2762              }              }
2763            else            else
2764              {              if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);
             if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);  
             }  
2765            }            }
2766          }          }
2767        else        else
2768  #endif  #endif
2769        /* Not UTF-8 mode */        /* Not UTF mode */
2770          {          {
2771          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
2772            {            {
2773            if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);            if (eptr >= md->end_subject)
2774                {
2775                SCHECK_PARTIAL();
2776                MRRETURN(MATCH_NOMATCH);
2777                }
2778            c = *eptr++;            c = *eptr++;
2779            if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);  #ifndef COMPILE_PCRE8
2780              if (c > 255)
2781                {
2782                if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);
2783                }
2784              else
2785    #endif
2786                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);
2787            }            }
2788          }          }
2789    
# Line 1853  for (;;) Line 2797  for (;;)
2797    
2798        if (minimize)        if (minimize)
2799          {          {
2800  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2801          /* UTF-8 mode */          if (utf)
         if (utf8)  
2802            {            {
2803            for (fi = min;; fi++)            for (fi = min;; fi++)
2804              {              {
2805              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM16);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM16);
2806              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2807              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);              if (fi >= max) MRRETURN(MATCH_NOMATCH);
2808                if (eptr >= md->end_subject)
2809                  {
2810                  SCHECK_PARTIAL();
2811                  MRRETURN(MATCH_NOMATCH);
2812                  }
2813              GETCHARINC(c, eptr);              GETCHARINC(c, eptr);
2814              if (c > 255)              if (c > 255)
2815                {                {
2816                if (op == OP_CLASS) RRETURN(MATCH_NOMATCH);                if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);
2817                }                }
2818              else              else
2819                {                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);
               if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);  
               }  
2820              }              }
2821            }            }
2822          else          else
2823  #endif  #endif
2824          /* Not UTF-8 mode */          /* Not UTF mode */
2825            {            {
2826            for (fi = min;; fi++)            for (fi = min;; fi++)
2827              {              {
2828              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM17);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM17);
2829              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2830              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);              if (fi >= max) MRRETURN(MATCH_NOMATCH);
2831                if (eptr >= md->end_subject)
2832                  {
2833                  SCHECK_PARTIAL();
2834                  MRRETURN(MATCH_NOMATCH);
2835                  }
2836              c = *eptr++;              c = *eptr++;
2837              if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH);  #ifndef COMPILE_PCRE8
2838                if (c > 255)
2839                  {
2840                  if (op == OP_CLASS) MRRETURN(MATCH_NOMATCH);
2841                  }
2842                else
2843    #endif
2844                  if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) MRRETURN(MATCH_NOMATCH);
2845              }              }
2846            }            }
2847          /* Control never gets here */          /* Control never gets here */
# Line 1895  for (;;) Line 2853  for (;;)
2853          {          {
2854          pp = eptr;          pp = eptr;
2855    
2856  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
2857          /* UTF-8 mode */          if (utf)
         if (utf8)  
2858            {            {
2859            for (i = min; i < max; i++)            for (i = min; i < max; i++)
2860              {              {
2861              int len = 1;              int len = 1;
2862              if (eptr >= md->end_subject) break;              if (eptr >= md->end_subject)
2863                  {
2864                  SCHECK_PARTIAL();
2865                  break;
2866                  }
2867              GETCHARLEN(c, eptr, len);              GETCHARLEN(c, eptr, len);
2868              if (c > 255)              if (c > 255)
2869                {                {
2870                if (op == OP_CLASS) break;                if (op == OP_CLASS) break;
2871                }                }
2872              else              else
2873                {                if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) break;
               if ((data[c/8] & (1 << (c&7))) == 0) break;  
               }  
2874              eptr += len;              eptr += len;
2875              }              }
2876            for (;;)            for (;;)
2877              {              {
2878              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM18);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM18);
2879              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2880              if (eptr-- == pp) break;        /* Stop if tried at original pos */              if (eptr-- == pp) break;        /* Stop if tried at original pos */
2881              BACKCHAR(eptr);              BACKCHAR(eptr);
# Line 1924  for (;;) Line 2883  for (;;)
2883            }            }
2884          else          else
2885  #endif  #endif
2886            /* Not UTF-8 mode */            /* Not UTF mode */
2887            {            {
2888            for (i = min; i < max; i++)            for (i = min; i < max; i++)
2889              {              {
2890              if (eptr >= md->end_subject) break;              if (eptr >= md->end_subject)
2891                  {
2892                  SCHECK_PARTIAL();
2893                  break;
2894                  }
2895              c = *eptr;              c = *eptr;
2896              if ((data[c/8] & (1 << (c&7))) == 0) break;  #ifndef COMPILE_PCRE8
2897                if (c > 255)
2898                  {
2899                  if (op == OP_CLASS) break;
2900                  }
2901                else
2902    #endif
2903                  if ((BYTE_MAP[c/8] & (1 << (c&7))) == 0) break;
2904              eptr++;              eptr++;
2905              }              }
2906            while (eptr >= pp)            while (eptr >= pp)
2907              {              {
2908              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM19);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM19);
2909              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2910              eptr--;              eptr--;
2911              }              }
2912            }            }
2913    
2914          RRETURN(MATCH_NOMATCH);          MRRETURN(MATCH_NOMATCH);
2915          }          }
2916    #undef BYTE_MAP
2917        }        }
2918      /* Control never gets here */      /* Control never gets here */
2919    
2920    
2921      /* Match an extended character class. This opcode is encountered only      /* Match an extended character class. This opcode is encountered only
2922      in UTF-8 mode, because that's the only time it is compiled. */      when UTF-8 mode mode is supported. Nevertheless, we may not be in UTF-8
2923        mode, because Unicode properties are supported in non-UTF-8 mode. */
2924    
2925  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2926      case OP_XCLASS:      case OP_XCLASS:
2927        {        {
2928        data = ecode + 1 + LINK_SIZE;                /* Save for matching */        data = ecode + 1 + LINK_SIZE;                /* Save for matching */
# Line 1975  for (;;) Line 2947  for (;;)
2947          case OP_CRMINRANGE:          case OP_CRMINRANGE:
2948          minimize = (*ecode == OP_CRMINRANGE);          minimize = (*ecode == OP_CRMINRANGE);
2949          min = GET2(ecode, 1);          min = GET2(ecode, 1);
2950          max = GET2(ecode, 3);          max = GET2(ecode, 1 + IMM2_SIZE);
2951          if (max == 0) max = INT_MAX;          if (max == 0) max = INT_MAX;
2952          ecode += 5;          ecode += 1 + 2 * IMM2_SIZE;
2953          break;          break;
2954    
2955          default:               /* No repeat follows */          default:               /* No repeat follows */
# Line 1989  for (;;) Line 2961  for (;;)
2961    
2962        for (i = 1; i <= min; i++)        for (i = 1; i <= min; i++)
2963          {          {
2964          if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);          if (eptr >= md->end_subject)
2965          GETCHARINC(c, eptr);            {
2966          if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH);            SCHECK_PARTIAL();
2967              MRRETURN(MATCH_NOMATCH);
2968              }
2969            GETCHARINCTEST(c, eptr);
2970            if (!PRIV(xclass)(c, data)) MRRETURN(MATCH_NOMATCH);
2971          }          }
2972    
2973        /* 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 2006  for (;;) Line 2982  for (;;)
2982          {          {
2983          for (fi = min;; fi++)          for (fi = min;; fi++)
2984            {            {
2985            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM20);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM20);
2986            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
2987            if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);            if (fi >= max) MRRETURN(MATCH_NOMATCH);
2988            GETCHARINC(c, eptr);            if (eptr >= md->end_subject)
2989            if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH);              {
2990                SCHECK_PARTIAL();
2991                MRRETURN(MATCH_NOMATCH);
2992                }
2993              GETCHARINCTEST(c, eptr);
2994              if (!PRIV(xclass)(c, data)) MRRETURN(MATCH_NOMATCH);
2995            }            }
2996          /* Control never gets here */          /* Control never gets here */
2997          }          }
# Line 2023  for (;;) Line 3004  for (;;)
3004          for (i = min; i < max; i++)          for (i = min; i < max; i++)
3005            {            {
3006            int len = 1;            int len = 1;
3007            if (eptr >= md->end_subject) break;            if (eptr >= md->end_subject)
3008            GETCHARLEN(c, eptr, len);              {
3009            if (!_pcre_xclass(c, data)) break;              SCHECK_PARTIAL();
3010                break;
3011                }
3012    #ifdef SUPPORT_UTF
3013              GETCHARLENTEST(c, eptr, len);
3014    #else
3015              c = *eptr;
3016    #endif
3017              if (!PRIV(xclass)(c, data)) break;
3018            eptr += len;            eptr += len;
3019            }            }
3020          for(;;)          for(;;)
3021            {            {
3022            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM21);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM21);
3023            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3024            if (eptr-- == pp) break;        /* Stop if tried at original pos */            if (eptr-- == pp) break;        /* Stop if tried at original pos */
3025            BACKCHAR(eptr)  #ifdef SUPPORT_UTF
3026              if (utf) BACKCHAR(eptr);
3027    #endif
3028            }            }
3029          RRETURN(MATCH_NOMATCH);          MRRETURN(MATCH_NOMATCH);
3030          }          }
3031    
3032        /* Control never gets here */        /* Control never gets here */
# Line 2046  for (;;) Line 3037  for (;;)
3037    
3038      case OP_CHAR:      case OP_CHAR:
3039  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
3040      if (utf8)      if (utf)
3041        {        {
3042        length = 1;        length = 1;
3043        ecode++;        ecode++;
3044        GETCHARLEN(fc, ecode, length);        GETCHARLEN(fc, ecode, length);
3045        if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);        if (length > md->end_subject - eptr)
3046        while (length-- > 0) if (*ecode++ != *eptr++) RRETURN(MATCH_NOMATCH);          {
3047            CHECK_PARTIAL();             /* Not SCHECK_PARTIAL() */
3048            MRRETURN(MATCH_NOMATCH);
3049            }
3050          while (length-- > 0) if (*ecode++ != *eptr++) MRRETURN(MATCH_NOMATCH);
3051        }        }
3052      else      else
3053  #endif  #endif
3054        /* Not UTF mode */
     /* Non-UTF-8 mode */  
3055        {        {
3056        if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH);        if (md->end_subject - eptr < 1)
3057        if (ecode[1] != *eptr++) RRETURN(MATCH_NOMATCH);          {
3058            SCHECK_PARTIAL();            /* This one can use SCHECK_PARTIAL() */
3059            MRRETURN(MATCH_NOMATCH);
3060            }
3061          if (ecode[1] != *eptr++) MRRETURN(MATCH_NOMATCH);
3062        ecode += 2;        ecode += 2;
3063        }        }
3064      break;      break;
3065    
3066      /* Match a single character, caselessly */      /* Match a single character, caselessly */
3067    
3068      case OP_CHARNC:      case OP_CHARI:
3069  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
3070      if (utf8)      if (utf)
3071        {        {
3072        length = 1;        length = 1;
3073        ecode++;        ecode++;
3074        GETCHARLEN(fc, ecode, length);        GETCHARLEN(fc, ecode, length);
3075    
3076        if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);        if (length > md->end_subject - eptr)
3077            {
3078            CHECK_PARTIAL();             /* Not SCHECK_PARTIAL() */
3079            MRRETURN(MATCH_NOMATCH);
3080            }
3081    
3082        /* 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
3083        can use the fast lookup table. */        can use the fast lookup table. */
3084    
3085        if (fc < 128)        if (fc < 128)
3086          {          {
3087          if (md->lcc[*ecode++] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);          if (md->lcc[*ecode++] != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);
3088          }          }
3089    
3090        /* Otherwise we must pick up the subject character */        /* Otherwise we must pick up the subject character */
# Line 2099  for (;;) Line 3101  for (;;)
3101          if (fc != dc)          if (fc != dc)
3102            {            {
3103  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3104            if (dc != _pcre_ucp_othercase(fc))            if (dc != UCD_OTHERCASE(fc))
3105  #endif  #endif
3106              RRETURN(MATCH_NOMATCH);              MRRETURN(MATCH_NOMATCH);
3107            }            }
3108          }          }
3109        }        }
3110      else      else
3111  #endif   /* SUPPORT_UTF8 */  #endif   /* SUPPORT_UTF8 */
3112    
3113      /* Non-UTF-8 mode */      /* Not UTF mode */
3114        {        {
3115        if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH);        if (md->end_subject - eptr < 1)
3116        if (md->lcc[ecode[1]] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);          {
3117            SCHECK_PARTIAL();            /* This one can use SCHECK_PARTIAL() */
3118            MRRETURN(MATCH_NOMATCH);
3119            }
3120          if (md->lcc[ecode[1]] != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);
3121        ecode += 2;        ecode += 2;
3122        }        }
3123      break;      break;
# Line 2119  for (;;) Line 3125  for (;;)
3125      /* Match a single character repeatedly. */      /* Match a single character repeatedly. */
3126    
3127      case OP_EXACT:      case OP_EXACT:
3128        case OP_EXACTI:
3129      min = max = GET2(ecode, 1);      min = max = GET2(ecode, 1);
3130      ecode += 3;      ecode += 1 + IMM2_SIZE;
3131      goto REPEATCHAR;      goto REPEATCHAR;
3132    
3133      case OP_POSUPTO:      case OP_POSUPTO:
3134        case OP_POSUPTOI:
3135      possessive = TRUE;      possessive = TRUE;
3136      /* Fall through */      /* Fall through */
3137    
3138      case OP_UPTO:      case OP_UPTO:
3139        case OP_UPTOI:
3140      case OP_MINUPTO:      case OP_MINUPTO:
3141        case OP_MINUPTOI:
3142      min = 0;      min = 0;
3143      max = GET2(ecode, 1);      max = GET2(ecode, 1);
3144      minimize = *ecode == OP_MINUPTO;      minimize = *ecode == OP_MINUPTO || *ecode == OP_MINUPTOI;
3145      ecode += 3;      ecode += 1 + IMM2_SIZE;
3146      goto REPEATCHAR;      goto REPEATCHAR;
3147    
3148      case OP_POSSTAR:      case OP_POSSTAR:
3149        case OP_POSSTARI:
3150      possessive = TRUE;      possessive = TRUE;
3151      min = 0;      min = 0;
3152      max = INT_MAX;      max = INT_MAX;
# Line 2143  for (;;) Line 3154  for (;;)
3154      goto REPEATCHAR;      goto REPEATCHAR;
3155    
3156      case OP_POSPLUS:      case OP_POSPLUS:
3157        case OP_POSPLUSI:
3158      possessive = TRUE;      possessive = TRUE;
3159      min = 1;      min = 1;
3160      max = INT_MAX;      max = INT_MAX;
# Line 2150  for (;;) Line 3162  for (;;)
3162      goto REPEATCHAR;      goto REPEATCHAR;
3163    
3164      case OP_POSQUERY:      case OP_POSQUERY:
3165        case OP_POSQUERYI:
3166      possessive = TRUE;      possessive = TRUE;
3167      min = 0;      min = 0;
3168      max = 1;      max = 1;
# Line 2157  for (;;) Line 3170  for (;;)
3170      goto REPEATCHAR;      goto REPEATCHAR;
3171    
3172      case OP_STAR:      case OP_STAR:
3173        case OP_STARI:
3174      case OP_MINSTAR:      case OP_MINSTAR:
3175        case OP_MINSTARI:
3176      case OP_PLUS:      case OP_PLUS:
3177        case OP_PLUSI:
3178      case OP_MINPLUS:      case OP_MINPLUS:
3179        case OP_MINPLUSI:
3180      case OP_QUERY:      case OP_QUERY:
3181        case OP_QUERYI:
3182      case OP_MINQUERY:      case OP_MINQUERY:
3183      c = *ecode++ - OP_STAR;      case OP_MINQUERYI:
3184        c = *ecode++ - ((op < OP_STARI)? OP_STAR : OP_STARI);
3185      minimize = (c & 1) != 0;      minimize = (c & 1) != 0;
3186      min = rep_min[c];                 /* Pick up values from tables; */      min = rep_min[c];                 /* Pick up values from tables; */
3187      max = rep_max[c];                 /* zero for max => infinity */      max = rep_max[c];                 /* zero for max => infinity */
3188      if (max == 0) max = INT_MAX;      if (max == 0) max = INT_MAX;
3189    
3190      /* Common code for all repeated single-character matches. We can give      /* Common code for all repeated single-character matches. */
     up quickly if there are fewer than the minimum number of characters left in  
     the subject. */  
3191    
3192      REPEATCHAR:      REPEATCHAR:
3193  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
3194      if (utf8)      if (utf)
3195        {        {
3196        length = 1;        length = 1;
3197        charptr = ecode;        charptr = ecode;
3198        GETCHARLEN(fc, ecode, length);        GETCHARLEN(fc, ecode, length);
       if (min * length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);  
3199        ecode += length;        ecode += length;
3200    
3201        /* Handle multibyte character matching specially here. There is        /* Handle multibyte character matching specially here. There is
# Line 2189  for (;;) Line 3205  for (;;)
3205          {          {
3206  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3207          unsigned int othercase;          unsigned int othercase;
3208          if ((ims & PCRE_CASELESS) != 0 &&          if (op >= OP_STARI &&     /* Caseless */
3209              (othercase = _pcre_ucp_othercase(fc)) != NOTACHAR)              (othercase = UCD_OTHERCASE(fc)) != fc)
3210            oclength = _pcre_ord2utf8(othercase, occhars);            oclength = PRIV(ord2utf)(othercase, occhars);
3211          else oclength = 0;          else oclength = 0;
3212  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3213    
3214          for (i = 1; i <= min; i++)          for (i = 1; i <= min; i++)
3215            {            {
3216            if (memcmp(eptr, charptr, length) == 0) eptr += length;            if (eptr <= md->end_subject - length &&
3217                memcmp(eptr, charptr, length) == 0) eptr += length;
3218  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3219            /* Need braces because of following else */            else if (oclength > 0 &&
3220            else if (oclength == 0) { RRETURN(MATCH_NOMATCH); }                     eptr <= md->end_subject - oclength &&
3221                       memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3222    #endif  /* SUPPORT_UCP */
3223            else            else
3224              {              {
3225              if (memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH);              CHECK_PARTIAL();
3226              eptr += oclength;              MRRETURN(MATCH_NOMATCH);
3227              }              }
 #else   /* without SUPPORT_UCP */  
           else { RRETURN(MATCH_NOMATCH); }  
 #endif  /* SUPPORT_UCP */  
3228            }            }
3229    
3230          if (min == max) continue;          if (min == max) continue;
# Line 2217  for (;;) Line 3233  for (;;)
3233            {            {
3234            for (fi = min;; fi++)            for (fi = min;; fi++)
3235              {              {
3236              RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM22);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM22);
3237              if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3238              if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH);              if (fi >= max) MRRETURN(MATCH_NOMATCH);
3239              if (memcmp(eptr, charptr, length) == 0) eptr += length;              if (eptr <= md->end_subject - length &&
3240                  memcmp(eptr, charptr, length) == 0) eptr += length;
3241  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3242              /* Need braces because of following else */              else if (oclength > 0 &&
3243              else if (oclength == 0) { RRETURN(MATCH_NOMATCH); }                       eptr <= md->end_subject - oclength &&
3244                         memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3245    #endif  /* SUPPORT_UCP */
3246              else              else
3247                {                {
3248                if (memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH);                CHECK_PARTIAL();
3249                eptr += oclength;                MRRETURN(MATCH_NOMATCH);
3250                }                }
 #else   /* without SUPPORT_UCP */  
             else { RRETURN (MATCH_NOMATCH); }  
 #endif  /* SUPPORT_UCP */  
3251              }              }
3252            /* Control never gets here */            /* Control never gets here */
3253            }            }
# Line 2241  for (;;) Line 3257  for (;;)
3257            pp = eptr;            pp = eptr;
3258            for (i = min; i < max; i++)            for (i = min; i < max; i++)
3259              {              {
3260              if (eptr > md->end_subject - length) break;              if (eptr <= md->end_subject - length &&
3261              if (memcmp(eptr, charptr, length) == 0) eptr += length;                  memcmp(eptr, charptr, length) == 0) eptr += length;
3262  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3263              else if (oclength == 0) break;              else if (oclength > 0 &&
3264                         eptr <= md->end_subject - oclength &&
3265                         memcmp(eptr, occhars, IN_UCHARS(oclength)) == 0) eptr += oclength;
3266    #endif  /* SUPPORT_UCP */
3267              else              else
3268                {                {
3269                if (memcmp(eptr, occhars, oclength) != 0) break;                CHECK_PARTIAL();
3270                eptr += oclength;                break;
3271                }                }
 #else   /* without SUPPORT_UCP */  
             else break;  
 #endif  /* SUPPORT_UCP */  
3272              }              }
3273    
3274            if (possessive) continue;            if (possessive) continue;
3275    
3276            for(;;)            for(;;)
3277             {              {
3278             RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM23);              RMATCH(eptr, ecode, offset_top, md, eptrb, RM23);
3279             if (rrc != MATCH_NOMATCH) RRETURN(rrc);              if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3280             if (eptr == pp) RRETURN(MATCH_NOMATCH);              if (eptr == pp) { MRRETURN(MATCH_NOMATCH); }
3281  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
3282             eptr--;              eptr--;
3283             BACKCHAR(eptr);              BACKCHAR(eptr);
3284  #else   /* without SUPPORT_UCP */  #else   /* without SUPPORT_UCP */
3285             eptr -= length;              eptr -= length;
3286  #endif  /* SUPPORT_UCP */  #endif  /* SUPPORT_UCP */
3287             }              }
3288            }            }
3289          /* Control never gets here */          /* Control never gets here */
3290          }          }
# Line 2280  for (;;) Line 3297  for (;;)
3297  #endif  /* SUPPORT_UTF8 */  #endif  /* SUPPORT_UTF8 */
3298    
3299      /* When not in UTF-8 mode, load a single-byte character. */      /* When not in UTF-8 mode, load a single-byte character. */
3300        {  
3301        if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH);      fc = *ecode++;
       fc = *ecode++;  
       }  
3302    
3303      /* The value of fc at this point is always less than 256, though we may or      /* The value of fc at this point is always less than 256, though we may or
3304      may not be in UTF-8 mode. The code is duplicated for the caseless and      may not be in UTF-8 mode. The code is duplicated for the caseless and
# Line 2297  for (;;) Line 3312  for (;;)
3312      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,      DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max,
3313        max, eptr));        max, eptr));
3314    
3315      if ((ims & PCRE_CASELESS) != 0)      if (op >= OP_STARI)  /* Caseless */
3316        {        {
3317        fc = md->lcc[fc];        fc = md->lcc[fc];
3318        for (i = 1; i <= min; i++)        for (i = 1; i <= min; i++)
3319          if (fc != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH);          {
3320            if (eptr >= md->end_subject)
3321              {
3322              SCHECK_PARTIAL();
3323              MRRETURN(MATCH_NOMATCH);
3324              }
3325            if (fc != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);
3326            }
3327        if (min == max) continue;        if (min == max) continue;
3328        if (minimize)        if (minimize)
3329          {          {
3330          for (fi = min;; fi++)          for (fi = min;; fi++)
3331            {            {
3332            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM24);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM24);
3333            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3334            if (fi >= max || eptr >= md->end_subject ||            if (fi >= max) MRRETURN(MATCH_NOMATCH);
3335                fc != md->lcc[*eptr++])            if (eptr >= md->end_subject)
3336              RRETURN(MATCH_NOMATCH);              {
3337                SCHECK_PARTIAL();
3338                MRRETURN(MATCH_NOMATCH);
3339                }
3340              if (fc != md->lcc[*eptr++]) MRRETURN(MATCH_NOMATCH);
3341            }            }
3342          /* Control never gets here */          /* Control never gets here */
3343          }          }
# Line 2320  for (;;) Line 3346  for (;;)
3346          pp = eptr;          pp = eptr;
3347          for (i = min; i < max; i++)          for (i = min; i < max; i++)
3348            {            {
3349            if (eptr >= md->end_subject || fc != md->lcc[*eptr]) break;            if (eptr >= md->end_subject)
3350                {
3351                SCHECK_PARTIAL();
3352                break;
3353                }
3354              if (fc != md->lcc[*eptr]) break;
3355            eptr++;            eptr++;
3356            }            }
3357    
3358          if (possessive) continue;          if (possessive) continue;
3359    
3360          while (eptr >= pp)          while (eptr >= pp)
3361            {            {
3362            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM25);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM25);
3363            eptr--;            eptr--;
3364            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3365            }            }
3366          RRETURN(MATCH_NOMATCH);          MRRETURN(MATCH_NOMATCH);
3367          }          }
3368        /* Control never gets here */        /* Control never gets here */
3369        }        }
# Line 2339  for (;;) Line 3372  for (;;)
3372    
3373      else      else
3374        {        {
3375        for (i = 1; i <= min; i++) if (fc != *eptr++) RRETURN(MATCH_NOMATCH);        for (i = 1; i <= min; i++)
3376            {
3377            if (eptr >= md->end_subject)
3378              {
3379              SCHECK_PARTIAL();
3380              MRRETURN(MATCH_NOMATCH);
3381              }
3382            if (fc != *eptr++) MRRETURN(MATCH_NOMATCH);
3383            }
3384    
3385        if (min == max) continue;        if (min == max) continue;
3386    
3387        if (minimize)        if (minimize)
3388          {          {
3389          for (fi = min;; fi++)          for (fi = min;; fi++)
3390            {            {
3391            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM26);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM26);
3392            if (rrc != MATCH_NOMATCH) RRETURN(rrc);            if (rrc != MATCH_NOMATCH) RRETURN(rrc);
3393            if (fi >= max || eptr >= md->end_subject || fc != *eptr++)            if (fi >= max) MRRETURN(MATCH_NOMATCH);
3394              RRETURN(MATCH_NOMATCH);            if (eptr >= md->end_subject)
3395                {
3396                SCHECK_PARTIAL();
3397                MRRETURN(MATCH_NOMATCH);
3398                }
3399              if (fc != *eptr++) MRRETURN(MATCH_NOMATCH);
3400            }            }
3401          /* Control never gets here */          /* Control never gets here */
3402          }          }
# Line 2357  for (;;) Line 3405  for (;;)
3405          pp = eptr;          pp = eptr;
3406          for (i = min; i < max; i++)          for (i = min; i < max; i++)
3407            {            {
3408            if (eptr >= md->end_subject || fc != *eptr) break;            if (eptr >= md->end_subject)
3409                {
3410                SCHECK_PARTIAL();
3411                break;
3412                }
3413              if (fc != *eptr) break;
3414            eptr++;            eptr++;
3415            }            }
3416          if (possessive) continue;          if (possessive) continue;
3417    
3418          while (eptr >= pp)          while (eptr >= pp)
3419            {            {
3420            RMATCH(eptr, ecode, offset_top, md, ims, eptrb, 0, RM27);            RMATCH(eptr, ecode, offset_top, md, eptrb, RM27);
3421            eptr--;            eptr--;
3422            if (rrc != MATCH_NOMATCH) RRETU