/[pcre]/code/trunk/pcre_compile.c
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revision 81 by nigel, Sat Feb 24 21:40:59 2007 UTC revision 1132 by chpe, Thu Oct 18 18:35:22 2012 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) 1997-2005 University of Cambridge             Copyright (c) 1997-2012 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  supporting internal functions that are not used by other modules. */  supporting internal functions that are not used by other modules. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
49    #define NLBLOCK cd             /* Block containing newline information */
50    #define PSSTART start_pattern  /* Field containing processed string start */
51    #define PSEND   end_pattern    /* Field containing processed string end */
52    
53  #include "pcre_internal.h"  #include "pcre_internal.h"
54    
55    
56    /* When PCRE_DEBUG is defined, we need the pcre(16|32)_printint() function, which
57    is also used by pcretest. PCRE_DEBUG is not defined when building a production
58    library. We do not need to select pcre16_printint.c specially, because the
59    COMPILE_PCREx macro will already be appropriately set. */
60    
61    #ifdef PCRE_DEBUG
62    /* pcre_printint.c should not include any headers */
63    #define PCRE_INCLUDED
64    #include "pcre_printint.c"
65    #undef PCRE_INCLUDED
66    #endif
67    
68    
69    /* Macro for setting individual bits in class bitmaps. */
70    
71    #define SETBIT(a,b) a[(b)/8] |= (1 << ((b)&7))
72    
73    /* Maximum length value to check against when making sure that the integer that
74    holds the compiled pattern length does not overflow. We make it a bit less than
75    INT_MAX to allow for adding in group terminating bytes, so that we don't have
76    to check them every time. */
77    
78    #define OFLOW_MAX (INT_MAX - 20)
79    
80    /* Definitions to allow mutual recursion */
81    
82    static int
83      add_list_to_class(pcre_uint8 *, pcre_uchar **, int, compile_data *,
84        const pcre_uint32 *, unsigned int);
85    
86    static BOOL
87      compile_regex(int, pcre_uchar **, const pcre_uchar **, int *, BOOL, BOOL, int, int,
88        pcre_uint32 *, pcre_int32 *, pcre_uint32 *, pcre_int32 *, branch_chain *,
89        compile_data *, int *);
90    
91    
92    
93  /*************************************************  /*************************************************
94  *      Code parameters and static tables         *  *      Code parameters and static tables         *
95  *************************************************/  *************************************************/
96    
97  /* Maximum number of items on the nested bracket stacks at compile time. This  /* This value specifies the size of stack workspace that is used during the
98  applies to the nesting of all kinds of parentheses. It does not limit  first pre-compile phase that determines how much memory is required. The regex
99  un-nested, non-capturing parentheses. This number can be made bigger if  is partly compiled into this space, but the compiled parts are discarded as
100  necessary - it is used to dimension one int and one unsigned char vector at  soon as they can be, so that hopefully there will never be an overrun. The code
101  compile time. */  does, however, check for an overrun. The largest amount I've seen used is 218,
102    so this number is very generous.
103    
104    The same workspace is used during the second, actual compile phase for
105    remembering forward references to groups so that they can be filled in at the
106    end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE
107    is 4 there is plenty of room for most patterns. However, the memory can get
108    filled up by repetitions of forward references, for example patterns like
109    /(?1){0,1999}(b)/, and one user did hit the limit. The code has been changed so
110    that the workspace is expanded using malloc() in this situation. The value
111    below is therefore a minimum, and we put a maximum on it for safety. The
112    minimum is now also defined in terms of LINK_SIZE so that the use of malloc()
113    kicks in at the same number of forward references in all cases. */
114    
115    #define COMPILE_WORK_SIZE (2048*LINK_SIZE)
116    #define COMPILE_WORK_SIZE_MAX (100*COMPILE_WORK_SIZE)
117    
118    /* The overrun tests check for a slightly smaller size so that they detect the
119    overrun before it actually does run off the end of the data block. */
120    
121    #define WORK_SIZE_SAFETY_MARGIN (100)
122    
123    /* Private flags added to firstchar and reqchar. */
124    
125    #define REQ_CASELESS    (1 << 0)        /* Indicates caselessness */
126    #define REQ_VARY        (1 << 1)        /* Reqchar followed non-literal item */
127    /* Negative values for the firstchar and reqchar flags */
128    #define REQ_UNSET       (-2)
129    #define REQ_NONE        (-1)
130    
131  #define BRASTACK_SIZE 200  /* Repeated character flags. */
132    
133    #define UTF_LENGTH     0x10000000l      /* The char contains its length. */
134    
135  /* Table for handling escaped characters in the range '0'-'z'. Positive returns  /* Table for handling escaped characters in the range '0'-'z'. Positive returns
136  are simple data values; negative values are for special things like \d and so  are simple data values; negative values are for special things like \d and so
137  on. Zero means further processing is needed (for things like \x), or the escape  on. Zero means further processing is needed (for things like \x), or the escape
138  is invalid. */  is invalid. */
139    
140  #if !EBCDIC   /* This is the "normal" table for ASCII systems */  #ifndef EBCDIC
141    
142    /* This is the "normal" table for ASCII systems or for EBCDIC systems running
143    in UTF-8 mode. */
144    
145  static const short int escapes[] = {  static const short int escapes[] = {
146       0,      0,      0,      0,      0,      0,      0,      0,   /* 0 - 7 */       0,                       0,
147       0,      0,    ':',    ';',    '<',    '=',    '>',    '?',   /* 8 - ? */       0,                       0,
148     '@', -ESC_A, -ESC_B, -ESC_C, -ESC_D, -ESC_E,      0, -ESC_G,   /* @ - G */       0,                       0,
149       0,      0,      0,      0,      0,      0,      0,      0,   /* H - O */       0,                       0,
150  -ESC_P, -ESC_Q,      0, -ESC_S,      0,      0,      0, -ESC_W,   /* P - W */       0,                       0,
151  -ESC_X,      0, -ESC_Z,    '[',   '\\',    ']',    '^',    '_',   /* X - _ */       CHAR_COLON,              CHAR_SEMICOLON,
152     '`',      7, -ESC_b,      0, -ESC_d,  ESC_e,  ESC_f,      0,   /* ` - g */       CHAR_LESS_THAN_SIGN,     CHAR_EQUALS_SIGN,
153       0,      0,      0,      0,      0,      0,  ESC_n,      0,   /* h - o */       CHAR_GREATER_THAN_SIGN,  CHAR_QUESTION_MARK,
154  -ESC_p,      0,  ESC_r, -ESC_s,  ESC_tee,    0,      0, -ESC_w,   /* p - w */       CHAR_COMMERCIAL_AT,      -ESC_A,
155       0,      0, -ESC_z                                            /* x - z */       -ESC_B,                  -ESC_C,
156         -ESC_D,                  -ESC_E,
157         0,                       -ESC_G,
158         -ESC_H,                  0,
159         0,                       -ESC_K,
160         0,                       0,
161         -ESC_N,                  0,
162         -ESC_P,                  -ESC_Q,
163         -ESC_R,                  -ESC_S,
164         0,                       0,
165         -ESC_V,                  -ESC_W,
166         -ESC_X,                  0,
167         -ESC_Z,                  CHAR_LEFT_SQUARE_BRACKET,
168         CHAR_BACKSLASH,          CHAR_RIGHT_SQUARE_BRACKET,
169         CHAR_CIRCUMFLEX_ACCENT,  CHAR_UNDERSCORE,
170         CHAR_GRAVE_ACCENT,       7,
171         -ESC_b,                  0,
172         -ESC_d,                  ESC_e,
173         ESC_f,                   0,
174         -ESC_h,                  0,
175         0,                       -ESC_k,
176         0,                       0,
177         ESC_n,                   0,
178         -ESC_p,                  0,
179         ESC_r,                   -ESC_s,
180         ESC_tee,                 0,
181         -ESC_v,                  -ESC_w,
182         0,                       0,
183         -ESC_z
184  };  };
185    
186  #else         /* This is the "abnormal" table for EBCDIC systems */  #else
187    
188    /* This is the "abnormal" table for EBCDIC systems without UTF-8 support. */
189    
190  static const short int escapes[] = {  static const short int escapes[] = {
191  /*  48 */     0,     0,      0,     '.',    '<',   '(',    '+',    '|',  /*  48 */     0,     0,      0,     '.',    '<',   '(',    '+',    '|',
192  /*  50 */   '&',     0,      0,       0,      0,     0,      0,      0,  /*  50 */   '&',     0,      0,       0,      0,     0,      0,      0,
# Line 87  static const short int escapes[] = { Line 196  static const short int escapes[] = {
196  /*  70 */     0,     0,      0,       0,      0,     0,      0,      0,  /*  70 */     0,     0,      0,       0,      0,     0,      0,      0,
197  /*  78 */     0,   '`',    ':',     '#',    '@',  '\'',    '=',    '"',  /*  78 */     0,   '`',    ':',     '#',    '@',  '\'',    '=',    '"',
198  /*  80 */     0,     7, -ESC_b,       0, -ESC_d, ESC_e,  ESC_f,      0,  /*  80 */     0,     7, -ESC_b,       0, -ESC_d, ESC_e,  ESC_f,      0,
199  /*  88 */     0,     0,      0,     '{',      0,     0,      0,      0,  /*  88 */-ESC_h,     0,      0,     '{',      0,     0,      0,      0,
200  /*  90 */     0,     0,      0,     'l',      0, ESC_n,      0, -ESC_p,  /*  90 */     0,     0, -ESC_k,     'l',      0, ESC_n,      0, -ESC_p,
201  /*  98 */     0, ESC_r,      0,     '}',      0,     0,      0,      0,  /*  98 */     0, ESC_r,      0,     '}',      0,     0,      0,      0,
202  /*  A0 */     0,   '~', -ESC_s, ESC_tee,      0,     0, -ESC_w,      0,  /*  A0 */     0,   '~', -ESC_s, ESC_tee,      0,-ESC_v, -ESC_w,      0,
203  /*  A8 */     0,-ESC_z,      0,       0,      0,   '[',      0,      0,  /*  A8 */     0,-ESC_z,      0,       0,      0,   '[',      0,      0,
204  /*  B0 */     0,     0,      0,       0,      0,     0,      0,      0,  /*  B0 */     0,     0,      0,       0,      0,     0,      0,      0,
205  /*  B8 */     0,     0,      0,       0,      0,   ']',    '=',    '-',  /*  B8 */     0,     0,      0,       0,      0,   ']',    '=',    '-',
206  /*  C0 */   '{',-ESC_A, -ESC_B,  -ESC_C, -ESC_D,-ESC_E,      0, -ESC_G,  /*  C0 */   '{',-ESC_A, -ESC_B,  -ESC_C, -ESC_D,-ESC_E,      0, -ESC_G,
207  /*  C8 */     0,     0,      0,       0,      0,     0,      0,      0,  /*  C8 */-ESC_H,     0,      0,       0,      0,     0,      0,      0,
208  /*  D0 */   '}',     0,      0,       0,      0,     0,      0, -ESC_P,  /*  D0 */   '}',     0, -ESC_K,       0,      0,-ESC_N,      0, -ESC_P,
209  /*  D8 */-ESC_Q,     0,      0,       0,      0,     0,      0,      0,  /*  D8 */-ESC_Q,-ESC_R,      0,       0,      0,     0,      0,      0,
210  /*  E0 */  '\\',     0, -ESC_S,       0,      0,     0, -ESC_W, -ESC_X,  /*  E0 */  '\\',     0, -ESC_S,       0,      0,-ESC_V, -ESC_W, -ESC_X,
211  /*  E8 */     0,-ESC_Z,      0,       0,      0,     0,      0,      0,  /*  E8 */     0,-ESC_Z,      0,       0,      0,     0,      0,      0,
212  /*  F0 */     0,     0,      0,       0,      0,     0,      0,      0,  /*  F0 */     0,     0,      0,       0,      0,     0,      0,      0,
213  /*  F8 */     0,     0,      0,       0,      0,     0,      0,      0  /*  F8 */     0,     0,      0,       0,      0,     0,      0,      0
# Line 106  static const short int escapes[] = { Line 215  static const short int escapes[] = {
215  #endif  #endif
216    
217    
218  /* Tables of names of POSIX character classes and their lengths. The list is  /* Table of special "verbs" like (*PRUNE). This is a short table, so it is
219  terminated by a zero length entry. The first three must be alpha, upper, lower,  searched linearly. Put all the names into a single string, in order to reduce
220  as this is assumed for handling case independence. */  the number of relocations when a shared library is dynamically linked. The
221    string is built from string macros so that it works in UTF-8 mode on EBCDIC
222  static const char *const posix_names[] = {  platforms. */
223    "alpha", "lower", "upper",  
224    "alnum", "ascii", "blank", "cntrl", "digit", "graph",  typedef struct verbitem {
225    "print", "punct", "space", "word",  "xdigit" };    int   len;                 /* Length of verb name */
226      int   op;                  /* Op when no arg, or -1 if arg mandatory */
227      int   op_arg;              /* Op when arg present, or -1 if not allowed */
228    } verbitem;
229    
230    static const char verbnames[] =
231      "\0"                       /* Empty name is a shorthand for MARK */
232      STRING_MARK0
233      STRING_ACCEPT0
234      STRING_COMMIT0
235      STRING_F0
236      STRING_FAIL0
237      STRING_PRUNE0
238      STRING_SKIP0
239      STRING_THEN;
240    
241    static const verbitem verbs[] = {
242      { 0, -1,        OP_MARK },
243      { 4, -1,        OP_MARK },
244      { 6, OP_ACCEPT, -1 },
245      { 6, OP_COMMIT, -1 },
246      { 1, OP_FAIL,   -1 },
247      { 4, OP_FAIL,   -1 },
248      { 5, OP_PRUNE,  OP_PRUNE_ARG },
249      { 4, OP_SKIP,   OP_SKIP_ARG  },
250      { 4, OP_THEN,   OP_THEN_ARG  }
251    };
252    
253    static const int verbcount = sizeof(verbs)/sizeof(verbitem);
254    
255    
256  static const uschar posix_name_lengths[] = {  /* Tables of names of POSIX character classes and their lengths. The names are
257    now all in a single string, to reduce the number of relocations when a shared
258    library is dynamically loaded. The list of lengths is terminated by a zero
259    length entry. The first three must be alpha, lower, upper, as this is assumed
260    for handling case independence. */
261    
262    static const char posix_names[] =
263      STRING_alpha0 STRING_lower0 STRING_upper0 STRING_alnum0
264      STRING_ascii0 STRING_blank0 STRING_cntrl0 STRING_digit0
265      STRING_graph0 STRING_print0 STRING_punct0 STRING_space0
266      STRING_word0  STRING_xdigit;
267    
268    static const pcre_uint8 posix_name_lengths[] = {
269    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };
270    
271  /* Table of class bit maps for each POSIX class; up to three may be combined  /* Table of class bit maps for each POSIX class. Each class is formed from a
272  to form the class. The table for [:blank:] is dynamically modified to remove  base map, with an optional addition or removal of another map. Then, for some
273  the vertical space characters. */  classes, there is some additional tweaking: for [:blank:] the vertical space
274    characters are removed, and for [:alpha:] and [:alnum:] the underscore
275    character is removed. The triples in the table consist of the base map offset,
276    second map offset or -1 if no second map, and a non-negative value for map
277    addition or a negative value for map subtraction (if there are two maps). The
278    absolute value of the third field has these meanings: 0 => no tweaking, 1 =>
279    remove vertical space characters, 2 => remove underscore. */
280    
281  static const int posix_class_maps[] = {  static const int posix_class_maps[] = {
282    cbit_lower, cbit_upper, -1,             /* alpha */    cbit_word,  cbit_digit, -2,             /* alpha */
283    cbit_lower, -1,         -1,             /* lower */    cbit_lower, -1,          0,             /* lower */
284    cbit_upper, -1,         -1,             /* upper */    cbit_upper, -1,          0,             /* upper */
285    cbit_digit, cbit_lower, cbit_upper,     /* alnum */    cbit_word,  -1,          2,             /* alnum - word without underscore */
286    cbit_print, cbit_cntrl, -1,             /* ascii */    cbit_print, cbit_cntrl,  0,             /* ascii */
287    cbit_space, -1,         -1,             /* blank - a GNU extension */    cbit_space, -1,          1,             /* blank - a GNU extension */
288    cbit_cntrl, -1,         -1,             /* cntrl */    cbit_cntrl, -1,          0,             /* cntrl */
289    cbit_digit, -1,         -1,             /* digit */    cbit_digit, -1,          0,             /* digit */
290    cbit_graph, -1,         -1,             /* graph */    cbit_graph, -1,          0,             /* graph */
291    cbit_print, -1,         -1,             /* print */    cbit_print, -1,          0,             /* print */
292    cbit_punct, -1,         -1,             /* punct */    cbit_punct, -1,          0,             /* punct */
293    cbit_space, -1,         -1,             /* space */    cbit_space, -1,          0,             /* space */
294    cbit_word,  -1,         -1,             /* word - a Perl extension */    cbit_word,  -1,          0,             /* word - a Perl extension */
295    cbit_xdigit,-1,         -1              /* xdigit */    cbit_xdigit,-1,          0              /* xdigit */
296  };  };
297    
298    /* Table of substitutes for \d etc when PCRE_UCP is set. The POSIX class
299    substitutes must be in the order of the names, defined above, and there are
300    both positive and negative cases. NULL means no substitute. */
301    
302  /* The texts of compile-time error messages. These are "char *" because they  #ifdef SUPPORT_UCP
303  are passed to the outside world. */  static const pcre_uchar string_PNd[]  = {
304      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
305      CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
306    static const pcre_uchar string_pNd[]  = {
307      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
308      CHAR_N, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
309    static const pcre_uchar string_PXsp[] = {
310      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
311      CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
312    static const pcre_uchar string_pXsp[] = {
313      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
314      CHAR_X, CHAR_s, CHAR_p, CHAR_RIGHT_CURLY_BRACKET, '\0' };
315    static const pcre_uchar string_PXwd[] = {
316      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
317      CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
318    static const pcre_uchar string_pXwd[] = {
319      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
320      CHAR_X, CHAR_w, CHAR_d, CHAR_RIGHT_CURLY_BRACKET, '\0' };
321    
322    static const pcre_uchar *substitutes[] = {
323      string_PNd,           /* \D */
324      string_pNd,           /* \d */
325      string_PXsp,          /* \S */       /* NOTE: Xsp is Perl space */
326      string_pXsp,          /* \s */
327      string_PXwd,          /* \W */
328      string_pXwd           /* \w */
329    };
330    
331    static const pcre_uchar string_pL[] =   {
332      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
333      CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
334    static const pcre_uchar string_pLl[] =  {
335      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
336      CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
337    static const pcre_uchar string_pLu[] =  {
338      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
339      CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
340    static const pcre_uchar string_pXan[] = {
341      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
342      CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
343    static const pcre_uchar string_h[] =    {
344      CHAR_BACKSLASH, CHAR_h, '\0' };
345    static const pcre_uchar string_pXps[] = {
346      CHAR_BACKSLASH, CHAR_p, CHAR_LEFT_CURLY_BRACKET,
347      CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
348    static const pcre_uchar string_PL[] =   {
349      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
350      CHAR_L, CHAR_RIGHT_CURLY_BRACKET, '\0' };
351    static const pcre_uchar string_PLl[] =  {
352      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
353      CHAR_L, CHAR_l, CHAR_RIGHT_CURLY_BRACKET, '\0' };
354    static const pcre_uchar string_PLu[] =  {
355      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
356      CHAR_L, CHAR_u, CHAR_RIGHT_CURLY_BRACKET, '\0' };
357    static const pcre_uchar string_PXan[] = {
358      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
359      CHAR_X, CHAR_a, CHAR_n, CHAR_RIGHT_CURLY_BRACKET, '\0' };
360    static const pcre_uchar string_H[] =    {
361      CHAR_BACKSLASH, CHAR_H, '\0' };
362    static const pcre_uchar string_PXps[] = {
363      CHAR_BACKSLASH, CHAR_P, CHAR_LEFT_CURLY_BRACKET,
364      CHAR_X, CHAR_p, CHAR_s, CHAR_RIGHT_CURLY_BRACKET, '\0' };
365    
366    static const pcre_uchar *posix_substitutes[] = {
367      string_pL,            /* alpha */
368      string_pLl,           /* lower */
369      string_pLu,           /* upper */
370      string_pXan,          /* alnum */
371      NULL,                 /* ascii */
372      string_h,             /* blank */
373      NULL,                 /* cntrl */
374      string_pNd,           /* digit */
375      NULL,                 /* graph */
376      NULL,                 /* print */
377      NULL,                 /* punct */
378      string_pXps,          /* space */    /* NOTE: Xps is POSIX space */
379      string_pXwd,          /* word */
380      NULL,                 /* xdigit */
381      /* Negated cases */
382      string_PL,            /* ^alpha */
383      string_PLl,           /* ^lower */
384      string_PLu,           /* ^upper */
385      string_PXan,          /* ^alnum */
386      NULL,                 /* ^ascii */
387      string_H,             /* ^blank */
388      NULL,                 /* ^cntrl */
389      string_PNd,           /* ^digit */
390      NULL,                 /* ^graph */
391      NULL,                 /* ^print */
392      NULL,                 /* ^punct */
393      string_PXps,          /* ^space */   /* NOTE: Xps is POSIX space */
394      string_PXwd,          /* ^word */
395      NULL                  /* ^xdigit */
396    };
397    #define POSIX_SUBSIZE (sizeof(posix_substitutes) / sizeof(pcre_uchar *))
398    #endif
399    
400    #define STRING(a)  # a
401    #define XSTRING(s) STRING(s)
402    
403  static const char *error_texts[] = {  /* The texts of compile-time error messages. These are "char *" because they
404    "no error",  are passed to the outside world. Do not ever re-use any error number, because
405    "\\ at end of pattern",  they are documented. Always add a new error instead. Messages marked DEAD below
406    "\\c at end of pattern",  are no longer used. This used to be a table of strings, but in order to reduce
407    "unrecognized character follows \\",  the number of relocations needed when a shared library is loaded dynamically,
408    "numbers out of order in {} quantifier",  it is now one long string. We cannot use a table of offsets, because the
409    lengths of inserts such as XSTRING(MAX_NAME_SIZE) are not known. Instead, we
410    simply count through to the one we want - this isn't a performance issue
411    because these strings are used only when there is a compilation error.
412    
413    Each substring ends with \0 to insert a null character. This includes the final
414    substring, so that the whole string ends with \0\0, which can be detected when
415    counting through. */
416    
417    static const char error_texts[] =
418      "no error\0"
419      "\\ at end of pattern\0"
420      "\\c at end of pattern\0"
421      "unrecognized character follows \\\0"
422      "numbers out of order in {} quantifier\0"
423    /* 5 */    /* 5 */
424    "number too big in {} quantifier",    "number too big in {} quantifier\0"
425    "missing terminating ] for character class",    "missing terminating ] for character class\0"
426    "invalid escape sequence in character class",    "invalid escape sequence in character class\0"
427    "range out of order in character class",    "range out of order in character class\0"
428    "nothing to repeat",    "nothing to repeat\0"
429    /* 10 */    /* 10 */
430    "operand of unlimited repeat could match the empty string",    "operand of unlimited repeat could match the empty string\0"  /** DEAD **/
431    "internal error: unexpected repeat",    "internal error: unexpected repeat\0"
432    "unrecognized character after (?",    "unrecognized character after (? or (?-\0"
433    "POSIX named classes are supported only within a class",    "POSIX named classes are supported only within a class\0"
434    "missing )",    "missing )\0"
435    /* 15 */    /* 15 */
436    "reference to non-existent subpattern",    "reference to non-existent subpattern\0"
437    "erroffset passed as NULL",    "erroffset passed as NULL\0"
438    "unknown option bit(s) set",    "unknown option bit(s) set\0"
439    "missing ) after comment",    "missing ) after comment\0"
440    "parentheses nested too deeply",    "parentheses nested too deeply\0"  /** DEAD **/
441    /* 20 */    /* 20 */
442    "regular expression too large",    "regular expression is too large\0"
443    "failed to get memory",    "failed to get memory\0"
444    "unmatched parentheses",    "unmatched parentheses\0"
445    "internal error: code overflow",    "internal error: code overflow\0"
446    "unrecognized character after (?<",    "unrecognized character after (?<\0"
447    /* 25 */    /* 25 */
448    "lookbehind assertion is not fixed length",    "lookbehind assertion is not fixed length\0"
449    "malformed number after (?(",    "malformed number or name after (?(\0"
450    "conditional group contains more than two branches",    "conditional group contains more than two branches\0"
451    "assertion expected after (?(",    "assertion expected after (?(\0"
452    "(?R or (?digits must be followed by )",    "(?R or (?[+-]digits must be followed by )\0"
453    /* 30 */    /* 30 */
454    "unknown POSIX class name",    "unknown POSIX class name\0"
455    "POSIX collating elements are not supported",    "POSIX collating elements are not supported\0"
456    "this version of PCRE is not compiled with PCRE_UTF8 support",    "this version of PCRE is compiled without UTF support\0"
457    "spare error",    "spare error\0"  /** DEAD **/
458    "character value in \\x{...} sequence is too large",    "character value in \\x{...} sequence is too large\0"
459    /* 35 */    /* 35 */
460    "invalid condition (?(0)",    "invalid condition (?(0)\0"
461    "\\C not allowed in lookbehind assertion",    "\\C not allowed in lookbehind assertion\0"
462    "PCRE does not support \\L, \\l, \\N, \\U, or \\u",    "PCRE does not support \\L, \\l, \\N{name}, \\U, or \\u\0"
463    "number after (?C is > 255",    "number after (?C is > 255\0"
464    "closing ) for (?C expected",    "closing ) for (?C expected\0"
465    /* 40 */    /* 40 */
466    "recursive call could loop indefinitely",    "recursive call could loop indefinitely\0"
467    "unrecognized character after (?P",    "unrecognized character after (?P\0"
468    "syntax error after (?P",    "syntax error in subpattern name (missing terminator)\0"
469    "two named groups have the same name",    "two named subpatterns have the same name\0"
470    "invalid UTF-8 string",    "invalid UTF-8 string\0"
471    /* 45 */    /* 45 */
472    "support for \\P, \\p, and \\X has not been compiled",    "support for \\P, \\p, and \\X has not been compiled\0"
473    "malformed \\P or \\p sequence",    "malformed \\P or \\p sequence\0"
474    "unknown property name after \\P or \\p"    "unknown property name after \\P or \\p\0"
475  };    "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0"
476      "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
477      /* 50 */
478      "repeated subpattern is too long\0"    /** DEAD **/
479      "octal value is greater than \\377 in 8-bit non-UTF-8 mode\0"
480      "internal error: overran compiling workspace\0"
481      "internal error: previously-checked referenced subpattern not found\0"
482      "DEFINE group contains more than one branch\0"
483      /* 55 */
484      "repeating a DEFINE group is not allowed\0"  /** DEAD **/
485      "inconsistent NEWLINE options\0"
486      "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
487      "a numbered reference must not be zero\0"
488      "an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)\0"
489      /* 60 */
490      "(*VERB) not recognized\0"
491      "number is too big\0"
492      "subpattern name expected\0"
493      "digit expected after (?+\0"
494      "] is an invalid data character in JavaScript compatibility mode\0"
495      /* 65 */
496      "different names for subpatterns of the same number are not allowed\0"
497      "(*MARK) must have an argument\0"
498      "this version of PCRE is not compiled with Unicode property support\0"
499      "\\c must be followed by an ASCII character\0"
500      "\\k is not followed by a braced, angle-bracketed, or quoted name\0"
501      /* 70 */
502      "internal error: unknown opcode in find_fixedlength()\0"
503      "\\N is not supported in a class\0"
504      "too many forward references\0"
505      "disallowed Unicode code point (>= 0xd800 && <= 0xdfff)\0"
506      "invalid UTF-16 string\0"
507      /* 75 */
508      "name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)\0"
509      "character value in \\u.... sequence is too large\0"
510      "invalid UTF-32 string\0"
511      ;
512    
513  /* Table to identify digits and hex digits. This is used when compiling  /* Table to identify digits and hex digits. This is used when compiling
514  patterns. Note that the tables in chartables are dependent on the locale, and  patterns. Note that the tables in chartables are dependent on the locale, and
# Line 220  For convenience, we use the same bit def Line 526  For convenience, we use the same bit def
526    
527  Then we can use ctype_digit and ctype_xdigit in the code. */  Then we can use ctype_digit and ctype_xdigit in the code. */
528    
529  #if !EBCDIC    /* This is the "normal" case, for ASCII systems */  /* Using a simple comparison for decimal numbers rather than a memory read
530  static const unsigned char digitab[] =  is much faster, and the resulting code is simpler (the compiler turns it
531    into a subtraction and unsigned comparison). */
532    
533    #define IS_DIGIT(x) ((x) >= CHAR_0 && (x) <= CHAR_9)
534    
535    #ifndef EBCDIC
536    
537    /* This is the "normal" case, for ASCII systems, and EBCDIC systems running in
538    UTF-8 mode. */
539    
540    static const pcre_uint8 digitab[] =
541    {    {
542    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   0-  7 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   0-  7 */
543    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   8- 15 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   8- 15 */
# Line 256  static const unsigned char digitab[] = Line 572  static const unsigned char digitab[] =
572    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */
573    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */
574    
575  #else          /* This is the "abnormal" case, for EBCDIC systems */  #else
576  static const unsigned char digitab[] =  
577    /* This is the "abnormal" case, for EBCDIC systems not running in UTF-8 mode. */
578    
579    static const pcre_uint8 digitab[] =
580    {    {
581    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   0-  7  0 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   0-  7  0 */
582    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   8- 15    */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*   8- 15    */
# Line 270  static const unsigned char digitab[] = Line 589  static const unsigned char digitab[] =
589    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*    - 71 40 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*    - 71 40 */
590    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  72- |     */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  72- |     */
591    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  & - 87 50 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  & - 87 50 */
592    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  88-     */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  88- 95    */
593    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  - -103 60 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  - -103 60 */
594    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ?     */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ?     */
595    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */
# Line 292  static const unsigned char digitab[] = Line 611  static const unsigned char digitab[] =
611    0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /*  0 - 7  F0 */    0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /*  0 - 7  F0 */
612    0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/*  8 -255    */    0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/*  8 -255    */
613    
614  static const unsigned char ebcdic_chartab[] = { /* chartable partial dup */  static const pcre_uint8 ebcdic_chartab[] = { /* chartable partial dup */
615    0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /*   0-  7 */    0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /*   0-  7 */
616    0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /*   8- 15 */    0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /*   8- 15 */
617    0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /*  16- 23 */    0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /*  16- 23 */
# Line 304  static const unsigned char ebcdic_charta Line 623  static const unsigned char ebcdic_charta
623    0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*    - 71 */    0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*    - 71 */
624    0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /*  72- |  */    0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /*  72- |  */
625    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  & - 87 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  & - 87 */
626    0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /*  88-  */    0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /*  88- 95 */
627    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  - -103 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /*  - -103 */
628    0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ?  */    0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ?  */
629    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */
# Line 328  static const unsigned char ebcdic_charta Line 647  static const unsigned char ebcdic_charta
647  #endif  #endif
648    
649    
650  /* Definition to allow mutual recursion */  
651    /*************************************************
652    *            Find an error text                  *
653    *************************************************/
654    
655    /* The error texts are now all in one long string, to save on relocations. As
656    some of the text is of unknown length, we can't use a table of offsets.
657    Instead, just count through the strings. This is not a performance issue
658    because it happens only when there has been a compilation error.
659    
660    Argument:   the error number
661    Returns:    pointer to the error string
662    */
663    
664    static const char *
665    find_error_text(int n)
666    {
667    const char *s = error_texts;
668    for (; n > 0; n--)
669      {
670      while (*s++ != 0) {};
671      if (*s == 0) return "Error text not found (please report)";
672      }
673    return s;
674    }
675    
676    
677    /*************************************************
678    *           Expand the workspace                 *
679    *************************************************/
680    
681    /* This function is called during the second compiling phase, if the number of
682    forward references fills the existing workspace, which is originally a block on
683    the stack. A larger block is obtained from malloc() unless the ultimate limit
684    has been reached or the increase will be rather small.
685    
686    Argument: pointer to the compile data block
687    Returns:  0 if all went well, else an error number
688    */
689    
690    static int
691    expand_workspace(compile_data *cd)
692    {
693    pcre_uchar *newspace;
694    int newsize = cd->workspace_size * 2;
695    
696    if (newsize > COMPILE_WORK_SIZE_MAX) newsize = COMPILE_WORK_SIZE_MAX;
697    if (cd->workspace_size >= COMPILE_WORK_SIZE_MAX ||
698        newsize - cd->workspace_size < WORK_SIZE_SAFETY_MARGIN)
699     return ERR72;
700    
701    newspace = (PUBL(malloc))(IN_UCHARS(newsize));
702    if (newspace == NULL) return ERR21;
703    memcpy(newspace, cd->start_workspace, cd->workspace_size * sizeof(pcre_uchar));
704    cd->hwm = (pcre_uchar *)newspace + (cd->hwm - cd->start_workspace);
705    if (cd->workspace_size > COMPILE_WORK_SIZE)
706      (PUBL(free))((void *)cd->start_workspace);
707    cd->start_workspace = newspace;
708    cd->workspace_size = newsize;
709    return 0;
710    }
711    
712    
713    
714    /*************************************************
715    *            Check for counted repeat            *
716    *************************************************/
717    
718    /* This function is called when a '{' is encountered in a place where it might
719    start a quantifier. It looks ahead to see if it really is a quantifier or not.
720    It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}
721    where the ddds are digits.
722    
723    Arguments:
724      p         pointer to the first char after '{'
725    
726    Returns:    TRUE or FALSE
727    */
728    
729  static BOOL  static BOOL
730    compile_regex(int, int, int *, uschar **, const uschar **, int *, BOOL, int,  is_counted_repeat(const pcre_uchar *p)
731      int *, int *, branch_chain *, compile_data *);  {
732    if (!IS_DIGIT(*p)) return FALSE;
733    p++;
734    while (IS_DIGIT(*p)) p++;
735    if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
736    
737    if (*p++ != CHAR_COMMA) return FALSE;
738    if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
739    
740    if (!IS_DIGIT(*p)) return FALSE;
741    p++;
742    while (IS_DIGIT(*p)) p++;
743    
744    return (*p == CHAR_RIGHT_CURLY_BRACKET);
745    }
746    
747    
748    
# Line 341  static BOOL Line 751  static BOOL
751  *************************************************/  *************************************************/
752    
753  /* This function is called when a \ has been encountered. It either returns a  /* This function is called when a \ has been encountered. It either returns a
754  positive value for a simple escape such as \n, or a negative value which  positive value for a simple escape such as \n, or 0 for a data character
755  encodes one of the more complicated things such as \d. When UTF-8 is enabled,  which will be placed in chptr. A backreference to group n is returned as
756  a positive value greater than 255 may be returned. On entry, ptr is pointing at  negative n. When UTF-8 is enabled, a positive value greater than 255 may
757  the \. On exit, it is on the final character of the escape sequence.  be returned in chptr.
758    On entry,ptr is pointing at the \. On exit, it is on the final character of the
759    escape sequence.
760    
761  Arguments:  Arguments:
762    ptrptr         points to the pattern position pointer    ptrptr         points to the pattern position pointer
763      chptr          points to the data character
764    errorcodeptr   points to the errorcode variable    errorcodeptr   points to the errorcode variable
765    bracount       number of previous extracting brackets    bracount       number of previous extracting brackets
766    options        the options bits    options        the options bits
767    isclass        TRUE if inside a character class    isclass        TRUE if inside a character class
768    
769  Returns:         zero or positive => a data character  Returns:         zero => a data character
770                   negative => a special escape sequence                   positive => a special escape sequence
771                   on error, errorptr is set                   negative => a back reference
772                     on error, errorcodeptr is set
773  */  */
774    
775  static int  static int
776  check_escape(const uschar **ptrptr, int *errorcodeptr, int bracount,  check_escape(const pcre_uchar **ptrptr, pcre_uint32 *chptr, int *errorcodeptr,
777    int options, BOOL isclass)    int bracount, int options, BOOL isclass)
778  {  {
779  const uschar *ptr = *ptrptr;  /* PCRE_UTF16 has the same value as PCRE_UTF8. */
780  int c, i;  BOOL utf = (options & PCRE_UTF8) != 0;
781    const pcre_uchar *ptr = *ptrptr + 1;
782    pcre_uint32 c;
783    int escape = 0;
784    int i;
785    
786    GETCHARINCTEST(c, ptr);           /* Get character value, increment pointer */
787    ptr--;                            /* Set pointer back to the last byte */
788    
789  /* If backslash is at the end of the pattern, it's an error. */  /* If backslash is at the end of the pattern, it's an error. */
790    
 c = *(++ptr);  
791  if (c == 0) *errorcodeptr = ERR1;  if (c == 0) *errorcodeptr = ERR1;
792    
793  /* Non-alphamerics are literals. For digits or letters, do an initial lookup in  /* Non-alphanumerics are literals. For digits or letters, do an initial lookup
794  a table. A non-zero result is something that can be returned immediately.  in a table. A non-zero result is something that can be returned immediately.
795  Otherwise further processing may be required. */  Otherwise further processing may be required. */
796    
797  #if !EBCDIC    /* ASCII coding */  #ifndef EBCDIC  /* ASCII/UTF-8 coding */
798  else if (c < '0' || c > 'z') {}                           /* Not alphameric */  /* Not alphanumeric */
799  else if ((i = escapes[c - '0']) != 0) c = i;  else if (c < CHAR_0 || c > CHAR_z) {}
800    else if ((i = escapes[c - CHAR_0]) != 0) { if (i > 0) c = (pcre_uint32)i; else escape = -i; }
801  #else          /* EBCDIC coding */  
802  else if (c < 'a' || (ebcdic_chartab[c] & 0x0E) == 0) {}   /* Not alphameric */  #else           /* EBCDIC coding */
803  else if ((i = escapes[c - 0x48]) != 0)  c = i;  /* Not alphanumeric */
804    else if (c < CHAR_a || (!MAX_255(c) || (ebcdic_chartab[c] & 0x0E) == 0)) {}
805    else if ((i = escapes[c - 0x48]) != 0)  { if (i > 0) c = (pcre_uint32)i; else escape = -i; }
806  #endif  #endif
807    
808  /* Escapes that need further processing, or are illegal. */  /* Escapes that need further processing, or are illegal. */
809    
810  else  else
811    {    {
812    const uschar *oldptr;    const pcre_uchar *oldptr;
813      BOOL braced, negated, overflow;
814      int s;
815    
816    switch (c)    switch (c)
817      {      {
818      /* A number of Perl escapes are not handled by PCRE. We give an explicit      /* A number of Perl escapes are not handled by PCRE. We give an explicit
819      error. */      error. */
820    
821      case 'l':      case CHAR_l:
822      case 'L':      case CHAR_L:
     case 'N':  
     case 'u':  
     case 'U':  
823      *errorcodeptr = ERR37;      *errorcodeptr = ERR37;
824      break;      break;
825    
826        case CHAR_u:
827        if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
828          {
829          /* In JavaScript, \u must be followed by four hexadecimal numbers.
830          Otherwise it is a lowercase u letter. */
831          if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
832            && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0
833            && MAX_255(ptr[3]) && (digitab[ptr[3]] & ctype_xdigit) != 0
834            && MAX_255(ptr[4]) && (digitab[ptr[4]] & ctype_xdigit) != 0)
835            {
836            c = 0;
837            for (i = 0; i < 4; ++i)
838              {
839              register pcre_uint32 cc = *(++ptr);
840    #ifndef EBCDIC  /* ASCII/UTF-8 coding */
841              if (cc >= CHAR_a) cc -= 32;               /* Convert to upper case */
842              c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
843    #else           /* EBCDIC coding */
844              if (cc >= CHAR_a && cc <= CHAR_z) cc += 64;  /* Convert to upper case */
845              c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
846    #endif
847              }
848    
849    #if defined COMPILE_PCRE8
850            if (c > (utf ? 0x10ffff : 0xff))
851    #elif defined COMPILE_PCRE16
852            if (c > (utf ? 0x10ffff : 0xffff))
853    #elif defined COMPILE_PCRE32
854            if (utf && c > 0x10ffff)
855    #endif
856              {
857              *errorcodeptr = ERR76;
858              }
859            else if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
860            }
861          }
862        else
863          *errorcodeptr = ERR37;
864        break;
865    
866        case CHAR_U:
867        /* In JavaScript, \U is an uppercase U letter. */
868        if ((options & PCRE_JAVASCRIPT_COMPAT) == 0) *errorcodeptr = ERR37;
869        break;
870    
871        /* In a character class, \g is just a literal "g". Outside a character
872        class, \g must be followed by one of a number of specific things:
873    
874        (1) A number, either plain or braced. If positive, it is an absolute
875        backreference. If negative, it is a relative backreference. This is a Perl
876        5.10 feature.
877    
878        (2) Perl 5.10 also supports \g{name} as a reference to a named group. This
879        is part of Perl's movement towards a unified syntax for back references. As
880        this is synonymous with \k{name}, we fudge it up by pretending it really
881        was \k.
882    
883        (3) For Oniguruma compatibility we also support \g followed by a name or a
884        number either in angle brackets or in single quotes. However, these are
885        (possibly recursive) subroutine calls, _not_ backreferences. Just return
886        the ESC_g code (cf \k). */
887    
888        case CHAR_g:
889        if (isclass) break;
890        if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)
891          {
892          escape = ESC_g;
893          break;
894          }
895    
896        /* Handle the Perl-compatible cases */
897    
898        if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
899          {
900          const pcre_uchar *p;
901          for (p = ptr+2; *p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET; p++)
902            if (*p != CHAR_MINUS && !IS_DIGIT(*p)) break;
903          if (*p != 0 && *p != CHAR_RIGHT_CURLY_BRACKET)
904            {
905            escape = ESC_k;
906            break;
907            }
908          braced = TRUE;
909          ptr++;
910          }
911        else braced = FALSE;
912    
913        if (ptr[1] == CHAR_MINUS)
914          {
915          negated = TRUE;
916          ptr++;
917          }
918        else negated = FALSE;
919    
920        /* The integer range is limited by the machine's int representation. */
921        s = 0;
922        overflow = FALSE;
923        while (IS_DIGIT(ptr[1]))
924          {
925          if (s > INT_MAX / 10 - 1) /* Integer overflow */
926            {
927            overflow = TRUE;
928            break;
929            }
930          s = s * 10 + (int)(*(++ptr) - CHAR_0);
931          }
932        if (overflow) /* Integer overflow */
933          {
934          while (IS_DIGIT(ptr[1]))
935            ptr++;
936          *errorcodeptr = ERR61;
937          break;
938          }
939    
940        if (braced && *(++ptr) != CHAR_RIGHT_CURLY_BRACKET)
941          {
942          *errorcodeptr = ERR57;
943          break;
944          }
945    
946        if (s == 0)
947          {
948          *errorcodeptr = ERR58;
949          break;
950          }
951    
952        if (negated)
953          {
954          if (s > bracount)
955            {
956            *errorcodeptr = ERR15;
957            break;
958            }
959          s = bracount - (s - 1);
960          }
961    
962        escape = -s;
963        break;
964    
965      /* The handling of escape sequences consisting of a string of digits      /* The handling of escape sequences consisting of a string of digits
966      starting with one that is not zero is not straightforward. By experiment,      starting with one that is not zero is not straightforward. By experiment,
967      the way Perl works seems to be as follows:      the way Perl works seems to be as follows:
# Line 413  else Line 974  else
974      value is greater than 377, the least significant 8 bits are taken. Inside a      value is greater than 377, the least significant 8 bits are taken. Inside a
975      character class, \ followed by a digit is always an octal number. */      character class, \ followed by a digit is always an octal number. */
976    
977      case '1': case '2': case '3': case '4': case '5':      case CHAR_1: case CHAR_2: case CHAR_3: case CHAR_4: case CHAR_5:
978      case '6': case '7': case '8': case '9':      case CHAR_6: case CHAR_7: case CHAR_8: case CHAR_9:
979    
980      if (!isclass)      if (!isclass)
981        {        {
982        oldptr = ptr;        oldptr = ptr;
983        c -= '0';        /* The integer range is limited by the machine's int representation. */
984        while ((digitab[ptr[1]] & ctype_digit) != 0)        s = (int)(c -CHAR_0);
985          c = c * 10 + *(++ptr) - '0';        overflow = FALSE;
986        if (c < 10 || c <= bracount)        while (IS_DIGIT(ptr[1]))
987            {
988            if (s > INT_MAX / 10 - 1) /* Integer overflow */
989              {
990              overflow = TRUE;
991              break;
992              }
993            s = s * 10 + (int)(*(++ptr) - CHAR_0);
994            }
995          if (overflow) /* Integer overflow */
996            {
997            while (IS_DIGIT(ptr[1]))
998              ptr++;
999            *errorcodeptr = ERR61;
1000            break;
1001            }
1002          if (s < 10 || s <= bracount)
1003          {          {
1004          c = -(ESC_REF + c);          escape = -s;
1005          break;          break;
1006          }          }
1007        ptr = oldptr;      /* Put the pointer back and fall through */        ptr = oldptr;      /* Put the pointer back and fall through */
# Line 434  else Line 1011  else
1011      generates a binary zero byte and treats the digit as a following literal.      generates a binary zero byte and treats the digit as a following literal.
1012      Thus we have to pull back the pointer by one. */      Thus we have to pull back the pointer by one. */
1013    
1014      if ((c = *ptr) >= '8')      if ((c = *ptr) >= CHAR_8)
1015        {        {
1016        ptr--;        ptr--;
1017        c = 0;        c = 0;
# Line 442  else Line 1019  else
1019        }        }
1020    
1021      /* \0 always starts an octal number, but we may drop through to here with a      /* \0 always starts an octal number, but we may drop through to here with a
1022      larger first octal digit. */      larger first octal digit. The original code used just to take the least
1023        significant 8 bits of octal numbers (I think this is what early Perls used
1024      case '0':      to do). Nowadays we allow for larger numbers in UTF-8 mode and 16-bit mode,
1025      c -= '0';      but no more than 3 octal digits. */
1026      while(i++ < 2 && ptr[1] >= '0' && ptr[1] <= '7')  
1027          c = c * 8 + *(++ptr) - '0';      case CHAR_0:
1028      c &= 255;     /* Take least significant 8 bits */      c -= CHAR_0;
1029        while(i++ < 2 && ptr[1] >= CHAR_0 && ptr[1] <= CHAR_7)
1030            c = c * 8 + *(++ptr) - CHAR_0;
1031    #ifdef COMPILE_PCRE8
1032        if (!utf && c > 0xff) *errorcodeptr = ERR51;
1033    #endif
1034      break;      break;
1035    
1036      /* \x is complicated when UTF-8 is enabled. \x{ddd} is a character number      /* \x is complicated. \x{ddd} is a character number which can be greater
1037      which can be greater than 0xff, but only if the ddd are hex digits. */      than 0xff in utf or non-8bit mode, but only if the ddd are hex digits.
1038        If not, { is treated as a data character. */
1039    
1040        case CHAR_x:
1041        if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
1042          {
1043          /* In JavaScript, \x must be followed by two hexadecimal numbers.
1044          Otherwise it is a lowercase x letter. */
1045          if (MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0
1046            && MAX_255(ptr[2]) && (digitab[ptr[2]] & ctype_xdigit) != 0)
1047            {
1048            c = 0;
1049            for (i = 0; i < 2; ++i)
1050              {
1051              register pcre_uint32 cc = *(++ptr);
1052    #ifndef EBCDIC  /* ASCII/UTF-8 coding */
1053              if (cc >= CHAR_a) cc -= 32;               /* Convert to upper case */
1054              c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1055    #else           /* EBCDIC coding */
1056              if (cc >= CHAR_a && cc <= CHAR_z) cc += 64;  /* Convert to upper case */
1057              c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1058    #endif
1059              }
1060            }
1061          break;
1062          }
1063    
1064      case 'x':      if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
 #ifdef SUPPORT_UTF8  
     if (ptr[1] == '{' && (options & PCRE_UTF8) != 0)  
1065        {        {
1066        const uschar *pt = ptr + 2;        const pcre_uchar *pt = ptr + 2;
1067        register int count = 0;  
1068        c = 0;        c = 0;
1069        while ((digitab[*pt] & ctype_xdigit) != 0)        overflow = FALSE;
1070          while (MAX_255(*pt) && (digitab[*pt] & ctype_xdigit) != 0)
1071          {          {
1072          int cc = *pt++;          register pcre_uint32 cc = *pt++;
1073          count++;          if (c == 0 && cc == CHAR_0) continue;     /* Leading zeroes */
1074  #if !EBCDIC    /* ASCII coding */  
1075          if (cc >= 'a') cc -= 32;               /* Convert to upper case */  #ifdef COMPILE_PCRE32
1076          c = c * 16 + cc - ((cc < 'A')? '0' : ('A' - 10));          if (c >= 0x10000000l) { overflow = TRUE; break; }
1077  #else          /* EBCDIC coding */  #endif
1078          if (cc >= 'a' && cc <= 'z') cc += 64;  /* Convert to upper case */  
1079          c = c * 16 + cc - ((cc >= '0')? '0' : ('A' - 10));  #ifndef EBCDIC  /* ASCII/UTF-8 coding */
1080            if (cc >= CHAR_a) cc -= 32;               /* Convert to upper case */
1081            c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1082    #else           /* EBCDIC coding */
1083            if (cc >= CHAR_a && cc <= CHAR_z) cc += 64;  /* Convert to upper case */
1084            c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1085    #endif
1086    
1087    #if defined COMPILE_PCRE8
1088            if (c > (utf ? 0x10ffff : 0xff)) { overflow = TRUE; break; }
1089    #elif defined COMPILE_PCRE16
1090            if (c > (utf ? 0x10ffff : 0xffff)) { overflow = TRUE; break; }
1091    #elif defined COMPILE_PCRE32
1092            if (utf && c > 0x10ffff) { overflow = TRUE; break; }
1093  #endif  #endif
1094          }          }
1095        if (*pt == '}')  
1096          if (overflow)
1097            {
1098            while (MAX_255(*pt) && (digitab[*pt] & ctype_xdigit) != 0) pt++;
1099            *errorcodeptr = ERR34;
1100            }
1101    
1102          if (*pt == CHAR_RIGHT_CURLY_BRACKET)
1103          {          {
1104          if (c < 0 || count > 8) *errorcodeptr = ERR34;          if (utf && c >= 0xd800 && c <= 0xdfff) *errorcodeptr = ERR73;
1105          ptr = pt;          ptr = pt;
1106          break;          break;
1107          }          }
1108    
1109        /* If the sequence of hex digits does not end with '}', then we don't        /* If the sequence of hex digits does not end with '}', then we don't
1110        recognize this construct; fall through to the normal \x handling. */        recognize this construct; fall through to the normal \x handling. */
1111        }        }
 #endif  
1112    
1113      /* Read just a single hex char */      /* Read just a single-byte hex-defined char */
1114    
1115      c = 0;      c = 0;
1116      while (i++ < 2 && (digitab[ptr[1]] & ctype_xdigit) != 0)      while (i++ < 2 && MAX_255(ptr[1]) && (digitab[ptr[1]] & ctype_xdigit) != 0)
1117        {        {
1118        int cc;                               /* Some compilers don't like ++ */        pcre_uint32 cc;                          /* Some compilers don't like */
1119        cc = *(++ptr);                        /* in initializers */        cc = *(++ptr);                           /* ++ in initializers */
1120  #if !EBCDIC    /* ASCII coding */  #ifndef EBCDIC  /* ASCII/UTF-8 coding */
1121        if (cc >= 'a') cc -= 32;              /* Convert to upper case */        if (cc >= CHAR_a) cc -= 32;              /* Convert to upper case */
1122        c = c * 16 + cc - ((cc < 'A')? '0' : ('A' - 10));        c = c * 16 + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
1123  #else          /* EBCDIC coding */  #else           /* EBCDIC coding */
1124        if (cc <= 'z') cc += 64;              /* Convert to upper case */        if (cc <= CHAR_z) cc += 64;              /* Convert to upper case */
1125        c = c * 16 + cc - ((cc >= '0')? '0' : ('A' - 10));        c = c * 16 + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
1126  #endif  #endif
1127        }        }
1128      break;      break;
1129    
1130      /* Other special escapes not starting with a digit are straightforward */      /* For \c, a following letter is upper-cased; then the 0x40 bit is flipped.
1131        An error is given if the byte following \c is not an ASCII character. This
1132        coding is ASCII-specific, but then the whole concept of \cx is
1133        ASCII-specific. (However, an EBCDIC equivalent has now been added.) */
1134    
1135      case 'c':      case CHAR_c:
1136      c = *(++ptr);      c = *(++ptr);
1137      if (c == 0)      if (c == 0)
1138        {        {
1139        *errorcodeptr = ERR2;        *errorcodeptr = ERR2;
1140        return 0;        break;
1141        }        }
1142    #ifndef EBCDIC    /* ASCII/UTF-8 coding */
1143      /* A letter is upper-cased; then the 0x40 bit is flipped. This coding      if (c > 127)  /* Excludes all non-ASCII in either mode */
1144      is ASCII-specific, but then the whole concept of \cx is ASCII-specific.        {
1145      (However, an EBCDIC equivalent has now been added.) */        *errorcodeptr = ERR68;
1146          break;
1147  #if !EBCDIC    /* ASCII coding */        }
1148      if (c >= 'a' && c <= 'z') c -= 32;      if (c >= CHAR_a && c <= CHAR_z) c -= 32;
1149      c ^= 0x40;      c ^= 0x40;
1150  #else          /* EBCDIC coding */  #else             /* EBCDIC coding */
1151      if (c >= 'a' && c <= 'z') c += 64;      if (c >= CHAR_a && c <= CHAR_z) c += 64;
1152      c ^= 0xC0;      c ^= 0xC0;
1153  #endif  #endif
1154      break;      break;
1155    
1156      /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any      /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
1157      other alphameric following \ is an error if PCRE_EXTRA was set; otherwise,      other alphanumeric following \ is an error if PCRE_EXTRA was set;
1158      for Perl compatibility, it is a literal. This code looks a bit odd, but      otherwise, for Perl compatibility, it is a literal. This code looks a bit
1159      there used to be some cases other than the default, and there may be again      odd, but there used to be some cases other than the default, and there may
1160      in future, so I haven't "optimized" it. */      be again in future, so I haven't "optimized" it. */
1161    
1162      default:      default:
1163      if ((options & PCRE_EXTRA) != 0) switch(c)      if ((options & PCRE_EXTRA) != 0) switch(c)
# Line 541  else Line 1170  else
1170      }      }
1171    }    }
1172    
1173  *ptrptr = ptr;  /* Perl supports \N{name} for character names, as well as plain \N for "not
1174  return c;  newline". PCRE does not support \N{name}. However, it does support
1175  }  quantification such as \N{2,3}. */
1176    
1177    if (escape == ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
1178         !is_counted_repeat(ptr+2))
1179      *errorcodeptr = ERR37;
1180    
1181    /* If PCRE_UCP is set, we change the values for \d etc. */
1182    
1183    if ((options & PCRE_UCP) != 0 && escape >= ESC_D && escape <= ESC_w)
1184      escape += (ESC_DU - ESC_D);
1185    
1186    /* Set the pointer to the final character before returning. */
1187    
1188    *ptrptr = ptr;
1189    *chptr = c;
1190    return escape;
1191    }
1192    
1193  #ifdef SUPPORT_UCP  #ifdef SUPPORT_UCP
1194  /*************************************************  /*************************************************
# Line 560  escape sequence. Line 1203  escape sequence.
1203  Argument:  Argument:
1204    ptrptr         points to the pattern position pointer    ptrptr         points to the pattern position pointer
1205    negptr         points to a boolean that is set TRUE for negation else FALSE    negptr         points to a boolean that is set TRUE for negation else FALSE
1206      ptypeptr       points to an unsigned int that is set to the type value
1207      pdataptr       points to an unsigned int that is set to the detailed property value
1208    errorcodeptr   points to the error code variable    errorcodeptr   points to the error code variable
1209    
1210  Returns:     value from ucp_type_table, or -1 for an invalid type  Returns:         TRUE if the type value was found, or FALSE for an invalid type
1211  */  */
1212    
1213  static int  static BOOL
1214  get_ucp(const uschar **ptrptr, BOOL *negptr, int *errorcodeptr)  get_ucp(const pcre_uchar **ptrptr, BOOL *negptr, unsigned int *ptypeptr,
1215      unsigned int *pdataptr, int *errorcodeptr)
1216  {  {
1217  int c, i, bot, top;  pcre_uchar c;
1218  const uschar *ptr = *ptrptr;  int i, bot, top;
1219  char name[4];  const pcre_uchar *ptr = *ptrptr;
1220    pcre_uchar name[32];
1221    
1222  c = *(++ptr);  c = *(++ptr);
1223  if (c == 0) goto ERROR_RETURN;  if (c == 0) goto ERROR_RETURN;
1224    
1225  *negptr = FALSE;  *negptr = FALSE;
1226    
1227  /* \P or \p can be followed by a one- or two-character name in {}, optionally  /* \P or \p can be followed by a name in {}, optionally preceded by ^ for
1228  preceded by ^ for negation. */  negation. */
1229    
1230  if (c == '{')  if (c == CHAR_LEFT_CURLY_BRACKET)
1231    {    {
1232    if (ptr[1] == '^')    if (ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
1233      {      {
1234      *negptr = TRUE;      *negptr = TRUE;
1235      ptr++;      ptr++;
1236      }      }
1237    for (i = 0; i <= 2; i++)    for (i = 0; i < (int)(sizeof(name) / sizeof(pcre_uchar)) - 1; i++)
1238      {      {
1239      c = *(++ptr);      c = *(++ptr);
1240      if (c == 0) goto ERROR_RETURN;      if (c == 0) goto ERROR_RETURN;
1241      if (c == '}') break;      if (c == CHAR_RIGHT_CURLY_BRACKET) break;
1242      name[i] = c;      name[i] = c;
1243      }      }
1244    if (c !='}')   /* Try to distinguish error cases */    if (c != CHAR_RIGHT_CURLY_BRACKET) goto ERROR_RETURN;
     {  
     while (*(++ptr) != 0 && *ptr != '}');  
     if (*ptr == '}') goto UNKNOWN_RETURN; else goto ERROR_RETURN;  
     }  
1245    name[i] = 0;    name[i] = 0;
1246    }    }
1247    
# Line 615  else Line 1258  else
1258  /* Search for a recognized property name using binary chop */  /* Search for a recognized property name using binary chop */
1259    
1260  bot = 0;  bot = 0;
1261  top = _pcre_utt_size;  top = PRIV(utt_size);
1262    
1263  while (bot < top)  while (bot < top)
1264    {    {
1265    i = (bot + top)/2;    int r;
1266    c = strcmp(name, _pcre_utt[i].name);    i = (bot + top) >> 1;
1267    if (c == 0) return _pcre_utt[i].value;    r = STRCMP_UC_C8(name, PRIV(utt_names) + PRIV(utt)[i].name_offset);
1268    if (c > 0) bot = i + 1; else top = i;    if (r == 0)
1269        {
1270        *ptypeptr = PRIV(utt)[i].type;
1271        *pdataptr = PRIV(utt)[i].value;
1272        return TRUE;
1273        }
1274      if (r > 0) bot = i + 1; else top = i;
1275    }    }
1276    
 UNKNOWN_RETURN:  
1277  *errorcodeptr = ERR47;  *errorcodeptr = ERR47;
1278  *ptrptr = ptr;  *ptrptr = ptr;
1279  return -1;  return FALSE;
1280    
1281  ERROR_RETURN:  ERROR_RETURN:
1282  *errorcodeptr = ERR46;  *errorcodeptr = ERR46;
1283  *ptrptr = ptr;  *ptrptr = ptr;
1284  return -1;  return FALSE;
1285  }  }
1286  #endif  #endif
1287    
# Line 641  return -1; Line 1289  return -1;
1289    
1290    
1291  /*************************************************  /*************************************************
 *            Check for counted repeat            *  
 *************************************************/  
   
 /* This function is called when a '{' is encountered in a place where it might  
 start a quantifier. It looks ahead to see if it really is a quantifier or not.  
 It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}  
 where the ddds are digits.  
   
 Arguments:  
   p         pointer to the first char after '{'  
   
 Returns:    TRUE or FALSE  
 */  
   
 static BOOL  
 is_counted_repeat(const uschar *p)  
 {  
 if ((digitab[*p++] & ctype_digit) == 0) return FALSE;  
 while ((digitab[*p] & ctype_digit) != 0) p++;  
 if (*p == '}') return TRUE;  
   
 if (*p++ != ',') return FALSE;  
 if (*p == '}') return TRUE;  
   
 if ((digitab[*p++] & ctype_digit) == 0) return FALSE;  
 while ((digitab[*p] & ctype_digit) != 0) p++;  
   
 return (*p == '}');  
 }  
   
   
   
 /*************************************************  
1292  *         Read repeat counts                     *  *         Read repeat counts                     *
1293  *************************************************/  *************************************************/
1294    
# Line 692  Returns:         pointer to '}' on succe Line 1307  Returns:         pointer to '}' on succe
1307                   current ptr on error, with errorcodeptr set non-zero                   current ptr on error, with errorcodeptr set non-zero
1308  */  */
1309    
1310  static const uschar *  static const pcre_uchar *
1311  read_repeat_counts(const uschar *p, int *minp, int *maxp, int *errorcodeptr)  read_repeat_counts(const pcre_uchar *p, int *minp, int *maxp, int *errorcodeptr)
1312  {  {
1313  int min = 0;  int min = 0;
1314  int max = -1;  int max = -1;
# Line 701  int max = -1; Line 1316  int max = -1;
1316  /* Read the minimum value and do a paranoid check: a negative value indicates  /* Read the minimum value and do a paranoid check: a negative value indicates
1317  an integer overflow. */  an integer overflow. */
1318    
1319  while ((digitab[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';  while (IS_DIGIT(*p)) min = min * 10 + (int)(*p++ - CHAR_0);
1320  if (min < 0 || min > 65535)  if (min < 0 || min > 65535)
1321    {    {
1322    *errorcodeptr = ERR5;    *errorcodeptr = ERR5;
# Line 711  if (min < 0 || min > 65535) Line 1326  if (min < 0 || min > 65535)
1326  /* Read the maximum value if there is one, and again do a paranoid on its size.  /* Read the maximum value if there is one, and again do a paranoid on its size.
1327  Also, max must not be less than min. */  Also, max must not be less than min. */
1328    
1329  if (*p == '}') max = min; else  if (*p == CHAR_RIGHT_CURLY_BRACKET) max = min; else
1330    {    {
1331    if (*(++p) != '}')    if (*(++p) != CHAR_RIGHT_CURLY_BRACKET)
1332      {      {
1333      max = 0;      max = 0;
1334      while((digitab[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0';      while(IS_DIGIT(*p)) max = max * 10 + (int)(*p++ - CHAR_0);
1335      if (max < 0 || max > 65535)      if (max < 0 || max > 65535)
1336        {        {
1337        *errorcodeptr = ERR5;        *errorcodeptr = ERR5;
# Line 741  return p; Line 1356  return p;
1356    
1357    
1358  /*************************************************  /*************************************************
1359  *      Find first significant op code            *  *  Subroutine for finding forward reference      *
1360  *************************************************/  *************************************************/
1361    
1362  /* This is called by several functions that scan a compiled expression looking  /* This recursive function is called only from find_parens() below. The
1363  for a fixed first character, or an anchoring op code etc. It skips over things  top-level call starts at the beginning of the pattern. All other calls must
1364  that do not influence this. For some calls, a change of option is important.  start at a parenthesis. It scans along a pattern's text looking for capturing
1365  For some calls, it makes sense to skip negative forward and all backward  subpatterns, and counting them. If it finds a named pattern that matches the
1366  assertions, and also the \b assertion; for others it does not.  name it is given, it returns its number. Alternatively, if the name is NULL, it
1367    returns when it reaches a given numbered subpattern. Recursion is used to keep
1368    track of subpatterns that reset the capturing group numbers - the (?| feature.
1369    
1370    This function was originally called only from the second pass, in which we know
1371    that if (?< or (?' or (?P< is encountered, the name will be correctly
1372    terminated because that is checked in the first pass. There is now one call to
1373    this function in the first pass, to check for a recursive back reference by
1374    name (so that we can make the whole group atomic). In this case, we need check
1375    only up to the current position in the pattern, and that is still OK because
1376    and previous occurrences will have been checked. To make this work, the test
1377    for "end of pattern" is a check against cd->end_pattern in the main loop,
1378    instead of looking for a binary zero. This means that the special first-pass
1379    call can adjust cd->end_pattern temporarily. (Checks for binary zero while
1380    processing items within the loop are OK, because afterwards the main loop will
1381    terminate.)
1382    
1383  Arguments:  Arguments:
1384    code         pointer to the start of the group    ptrptr       address of the current character pointer (updated)
1385    options      pointer to external options    cd           compile background data
1386    optbit       the option bit whose changing is significant, or    name         name to seek, or NULL if seeking a numbered subpattern
1387                   zero if none are    lorn         name length, or subpattern number if name is NULL
1388    skipassert   TRUE if certain assertions are to be skipped    xmode        TRUE if we are in /x mode
1389      utf          TRUE if we are in UTF-8 / UTF-16 / UTF-32 mode
1390      count        pointer to the current capturing subpattern number (updated)
1391    
1392  Returns:       pointer to the first significant opcode  Returns:       the number of the named subpattern, or -1 if not found
1393  */  */
1394    
1395  static const uschar*  static int
1396  first_significant_code(const uschar *code, int *options, int optbit,  find_parens_sub(pcre_uchar **ptrptr, compile_data *cd, const pcre_uchar *name, int lorn,
1397    BOOL skipassert)    BOOL xmode, BOOL utf, int *count)
1398  {  {
1399  for (;;)  pcre_uchar *ptr = *ptrptr;
1400    int start_count = *count;
1401    int hwm_count = start_count;
1402    BOOL dup_parens = FALSE;
1403    
1404    /* If the first character is a parenthesis, check on the type of group we are
1405    dealing with. The very first call may not start with a parenthesis. */
1406    
1407    if (ptr[0] == CHAR_LEFT_PARENTHESIS)
1408    {    {
1409    switch ((int)*code)    /* Handle specials such as (*SKIP) or (*UTF8) etc. */
     {  
     case OP_OPT:  
     if (optbit > 0 && ((int)code[1] & optbit) != (*options & optbit))  
       *options = (int)code[1];  
     code += 2;  
     break;  
1410    
1411      case OP_ASSERT_NOT:    if (ptr[1] == CHAR_ASTERISK) ptr += 2;
     case OP_ASSERTBACK:  
     case OP_ASSERTBACK_NOT:  
     if (!skipassert) return code;  
     do code += GET(code, 1); while (*code == OP_ALT);  
     code += _pcre_OP_lengths[*code];  
     break;  
1412    
1413      case OP_WORD_BOUNDARY:    /* Handle a normal, unnamed capturing parenthesis. */
     case OP_NOT_WORD_BOUNDARY:  
     if (!skipassert) return code;  
     /* Fall through */  
1414    
1415      case OP_CALLOUT:    else if (ptr[1] != CHAR_QUESTION_MARK)
1416      case OP_CREF:      {
1417      case OP_BRANUMBER:      *count += 1;
1418      code += _pcre_OP_lengths[*code];      if (name == NULL && *count == lorn) return *count;
1419      break;      ptr++;
1420        }
1421    
1422      /* All cases now have (? at the start. Remember when we are in a group
1423      where the parenthesis numbers are duplicated. */
1424    
1425      else if (ptr[2] == CHAR_VERTICAL_LINE)
1426        {
1427        ptr += 3;
1428        dup_parens = TRUE;
1429        }
1430    
1431      /* Handle comments; all characters are allowed until a ket is reached. */
1432    
1433      else if (ptr[2] == CHAR_NUMBER_SIGN)
1434        {
1435        for (ptr += 3; *ptr != 0; ptr++) if (*ptr == CHAR_RIGHT_PARENTHESIS) break;
1436        goto FAIL_EXIT;
1437        }
1438    
1439      /* Handle a condition. If it is an assertion, just carry on so that it
1440      is processed as normal. If not, skip to the closing parenthesis of the
1441      condition (there can't be any nested parens). */
1442    
1443      else if (ptr[2] == CHAR_LEFT_PARENTHESIS)
1444        {
1445        ptr += 2;
1446        if (ptr[1] != CHAR_QUESTION_MARK)
1447          {
1448          while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
1449          if (*ptr != 0) ptr++;
1450          }
1451        }
1452    
1453      /* Start with (? but not a condition. */
1454    
1455      else
1456        {
1457        ptr += 2;
1458        if (*ptr == CHAR_P) ptr++;                      /* Allow optional P */
1459    
1460        /* We have to disambiguate (?<! and (?<= from (?<name> for named groups */
1461    
1462        if ((*ptr == CHAR_LESS_THAN_SIGN && ptr[1] != CHAR_EXCLAMATION_MARK &&
1463            ptr[1] != CHAR_EQUALS_SIGN) || *ptr == CHAR_APOSTROPHE)
1464          {
1465          pcre_uchar term;
1466          const pcre_uchar *thisname;
1467          *count += 1;
1468          if (name == NULL && *count == lorn) return *count;
1469          term = *ptr++;
1470          if (term == CHAR_LESS_THAN_SIGN) term = CHAR_GREATER_THAN_SIGN;
1471          thisname = ptr;
1472          while (*ptr != term) ptr++;
1473          if (name != NULL && lorn == (int)(ptr - thisname) &&
1474              STRNCMP_UC_UC(name, thisname, (unsigned int)lorn) == 0)
1475            return *count;
1476          term++;
1477          }
1478        }
1479      }
1480    
1481    /* Past any initial parenthesis handling, scan for parentheses or vertical
1482    bars. Stop if we get to cd->end_pattern. Note that this is important for the
1483    first-pass call when this value is temporarily adjusted to stop at the current
1484    position. So DO NOT change this to a test for binary zero. */
1485    
1486    for (; ptr < cd->end_pattern; ptr++)
1487      {
1488      /* Skip over backslashed characters and also entire \Q...\E */
1489    
1490      if (*ptr == CHAR_BACKSLASH)
1491        {
1492        if (*(++ptr) == 0) goto FAIL_EXIT;
1493        if (*ptr == CHAR_Q) for (;;)
1494          {
1495          while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
1496          if (*ptr == 0) goto FAIL_EXIT;
1497          if (*(++ptr) == CHAR_E) break;
1498          }
1499        continue;
1500        }
1501    
1502      /* Skip over character classes; this logic must be similar to the way they
1503      are handled for real. If the first character is '^', skip it. Also, if the
1504      first few characters (either before or after ^) are \Q\E or \E we skip them
1505      too. This makes for compatibility with Perl. Note the use of STR macros to
1506      encode "Q\\E" so that it works in UTF-8 on EBCDIC platforms. */
1507    
1508      if (*ptr == CHAR_LEFT_SQUARE_BRACKET)
1509        {
1510        BOOL negate_class = FALSE;
1511        for (;;)
1512          {
1513          if (ptr[1] == CHAR_BACKSLASH)
1514            {
1515            if (ptr[2] == CHAR_E)
1516              ptr+= 2;
1517            else if (STRNCMP_UC_C8(ptr + 2,
1518                     STR_Q STR_BACKSLASH STR_E, 3) == 0)
1519              ptr += 4;
1520            else
1521              break;
1522            }
1523          else if (!negate_class && ptr[1] == CHAR_CIRCUMFLEX_ACCENT)
1524            {
1525            negate_class = TRUE;
1526            ptr++;
1527            }
1528          else break;
1529          }
1530    
1531        /* If the next character is ']', it is a data character that must be
1532        skipped, except in JavaScript compatibility mode. */
1533    
1534        if (ptr[1] == CHAR_RIGHT_SQUARE_BRACKET &&
1535            (cd->external_options & PCRE_JAVASCRIPT_COMPAT) == 0)
1536          ptr++;
1537    
1538        while (*(++ptr) != CHAR_RIGHT_SQUARE_BRACKET)
1539          {
1540          if (*ptr == 0) return -1;
1541          if (*ptr == CHAR_BACKSLASH)
1542            {
1543            if (*(++ptr) == 0) goto FAIL_EXIT;
1544            if (*ptr == CHAR_Q) for (;;)
1545              {
1546              while (*(++ptr) != 0 && *ptr != CHAR_BACKSLASH) {};
1547              if (*ptr == 0) goto FAIL_EXIT;
1548              if (*(++ptr) == CHAR_E) break;
1549              }
1550            continue;
1551            }
1552          }
1553        continue;
1554        }
1555    
1556      /* Skip comments in /x mode */
1557    
1558      if (xmode && *ptr == CHAR_NUMBER_SIGN)
1559        {
1560        ptr++;
1561        while (*ptr != 0)
1562          {
1563          if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; }
1564          ptr++;
1565    #ifdef SUPPORT_UTF
1566          if (utf) FORWARDCHAR(ptr);
1567    #endif
1568          }
1569        if (*ptr == 0) goto FAIL_EXIT;
1570        continue;
1571        }
1572    
1573      /* Check for the special metacharacters */
1574    
1575      if (*ptr == CHAR_LEFT_PARENTHESIS)
1576        {
1577        int rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, count);
1578        if (rc > 0) return rc;
1579        if (*ptr == 0) goto FAIL_EXIT;
1580        }
1581    
1582      else if (*ptr == CHAR_RIGHT_PARENTHESIS)
1583        {
1584        if (dup_parens && *count < hwm_count) *count = hwm_count;
1585        goto FAIL_EXIT;
1586        }
1587    
1588      else if (*ptr == CHAR_VERTICAL_LINE && dup_parens)
1589        {
1590        if (*count > hwm_count) hwm_count = *count;
1591        *count = start_count;
1592        }
1593      }
1594    
1595    FAIL_EXIT:
1596    *ptrptr = ptr;
1597    return -1;
1598    }
1599    
1600    
1601    
1602    
1603    /*************************************************
1604    *       Find forward referenced subpattern       *
1605    *************************************************/
1606    
1607    /* This function scans along a pattern's text looking for capturing
1608    subpatterns, and counting them. If it finds a named pattern that matches the
1609    name it is given, it returns its number. Alternatively, if the name is NULL, it
1610    returns when it reaches a given numbered subpattern. This is used for forward
1611    references to subpatterns. We used to be able to start this scan from the
1612    current compiling point, using the current count value from cd->bracount, and
1613    do it all in a single loop, but the addition of the possibility of duplicate
1614    subpattern numbers means that we have to scan from the very start, in order to
1615    take account of such duplicates, and to use a recursive function to keep track
1616    of the different types of group.
1617    
1618    Arguments:
1619      cd           compile background data
1620      name         name to seek, or NULL if seeking a numbered subpattern
1621      lorn         name length, or subpattern number if name is NULL
1622      xmode        TRUE if we are in /x mode
1623      utf          TRUE if we are in UTF-8 / UTF-16 / UTF-32 mode
1624    
1625    Returns:       the number of the found subpattern, or -1 if not found
1626    */
1627    
1628    static int
1629    find_parens(compile_data *cd, const pcre_uchar *name, int lorn, BOOL xmode,
1630      BOOL utf)
1631    {
1632    pcre_uchar *ptr = (pcre_uchar *)cd->start_pattern;
1633    int count = 0;
1634    int rc;
1635    
1636    /* If the pattern does not start with an opening parenthesis, the first call
1637    to find_parens_sub() will scan right to the end (if necessary). However, if it
1638    does start with a parenthesis, find_parens_sub() will return when it hits the
1639    matching closing parens. That is why we have to have a loop. */
1640    
1641    for (;;)
1642      {
1643      rc = find_parens_sub(&ptr, cd, name, lorn, xmode, utf, &count);
1644      if (rc > 0 || *ptr++ == 0) break;
1645      }
1646    
1647    return rc;
1648    }
1649    
1650    
1651    
1652    
1653    /*************************************************
1654    *      Find first significant op code            *
1655    *************************************************/
1656    
1657    /* This is called by several functions that scan a compiled expression looking
1658    for a fixed first character, or an anchoring op code etc. It skips over things
1659    that do not influence this. For some calls, it makes sense to skip negative
1660    forward and all backward assertions, and also the \b assertion; for others it
1661    does not.
1662    
1663    Arguments:
1664      code         pointer to the start of the group
1665      skipassert   TRUE if certain assertions are to be skipped
1666    
1667    Returns:       pointer to the first significant opcode
1668    */
1669    
1670    static const pcre_uchar*
1671    first_significant_code(const pcre_uchar *code, BOOL skipassert)
1672    {
1673    for (;;)
1674      {
1675      switch ((int)*code)
1676        {
1677        case OP_ASSERT_NOT:
1678        case OP_ASSERTBACK:
1679        case OP_ASSERTBACK_NOT:
1680        if (!skipassert) return code;
1681        do code += GET(code, 1); while (*code == OP_ALT);
1682        code += PRIV(OP_lengths)[*code];
1683        break;
1684    
1685        case OP_WORD_BOUNDARY:
1686        case OP_NOT_WORD_BOUNDARY:
1687        if (!skipassert) return code;
1688        /* Fall through */
1689    
1690        case OP_CALLOUT:
1691        case OP_CREF:
1692        case OP_NCREF:
1693        case OP_RREF:
1694        case OP_NRREF:
1695        case OP_DEF:
1696        code += PRIV(OP_lengths)[*code];
1697        break;
1698    
1699      default:      default:
1700      return code;      return code;
# Line 804  for (;;) Line 1707  for (;;)
1707    
1708    
1709  /*************************************************  /*************************************************
1710  *        Find the fixed length of a pattern      *  *        Find the fixed length of a branch       *
1711  *************************************************/  *************************************************/
1712    
1713  /* Scan a pattern and compute the fixed length of subject that will match it,  /* Scan a branch and compute the fixed length of subject that will match it,
1714  if the length is fixed. This is needed for dealing with backward assertions.  if the length is fixed. This is needed for dealing with backward assertions.
1715  In UTF8 mode, the result is in characters rather than bytes.  In UTF8 mode, the result is in characters rather than bytes. The branch is
1716    temporarily terminated with OP_END when this function is called.
1717    
1718    This function is called when a backward assertion is encountered, so that if it
1719    fails, the error message can point to the correct place in the pattern.
1720    However, we cannot do this when the assertion contains subroutine calls,
1721    because they can be forward references. We solve this by remembering this case
1722    and doing the check at the end; a flag specifies which mode we are running in.
1723    
1724  Arguments:  Arguments:
1725    code     points to the start of the pattern (the bracket)    code     points to the start of the pattern (the bracket)
1726    options  the compiling options    utf      TRUE in UTF-8 / UTF-16 / UTF-32 mode
1727      atend    TRUE if called when the pattern is complete
1728  Returns:   the fixed length, or -1 if there is no fixed length,    cd       the "compile data" structure
1729               or -2 if \C was encountered  
1730    Returns:   the fixed length,
1731                 or -1 if there is no fixed length,
1732                 or -2 if \C was encountered (in UTF-8 mode only)
1733                 or -3 if an OP_RECURSE item was encountered and atend is FALSE
1734                 or -4 if an unknown opcode was encountered (internal error)
1735  */  */
1736    
1737  static int  static int
1738  find_fixedlength(uschar *code, int options)  find_fixedlength(pcre_uchar *code, BOOL utf, BOOL atend, compile_data *cd)
1739  {  {
1740  int length = -1;  int length = -1;
1741    
1742  register int branchlength = 0;  register int branchlength = 0;
1743  register uschar *cc = code + 1 + LINK_SIZE;  register pcre_uchar *cc = code + 1 + LINK_SIZE;
1744    
1745  /* Scan along the opcodes for this branch. If we get to the end of the  /* Scan along the opcodes for this branch. If we get to the end of the
1746  branch, check the length against that of the other branches. */  branch, check the length against that of the other branches. */
# Line 833  branch, check the length against that of Line 1748  branch, check the length against that of
1748  for (;;)  for (;;)
1749    {    {
1750    int d;    int d;
1751    register int op = *cc;    pcre_uchar *ce, *cs;
1752    if (op >= OP_BRA) op = OP_BRA;    register pcre_uchar op = *cc;
1753    
1754    switch (op)    switch (op)
1755      {      {
1756        /* We only need to continue for OP_CBRA (normal capturing bracket) and
1757        OP_BRA (normal non-capturing bracket) because the other variants of these
1758        opcodes are all concerned with unlimited repeated groups, which of course
1759        are not of fixed length. */
1760    
1761        case OP_CBRA:
1762      case OP_BRA:      case OP_BRA:
1763      case OP_ONCE:      case OP_ONCE:
1764        case OP_ONCE_NC:
1765      case OP_COND:      case OP_COND:
1766      d = find_fixedlength(cc, options);      d = find_fixedlength(cc + ((op == OP_CBRA)? IMM2_SIZE : 0), utf, atend, cd);
1767      if (d < 0) return d;      if (d < 0) return d;
1768      branchlength += d;      branchlength += d;
1769      do cc += GET(cc, 1); while (*cc == OP_ALT);      do cc += GET(cc, 1); while (*cc == OP_ALT);
1770      cc += 1 + LINK_SIZE;      cc += 1 + LINK_SIZE;
1771      break;      break;
1772    
1773      /* Reached end of a branch; if it's a ket it is the end of a nested      /* Reached end of a branch; if it's a ket it is the end of a nested call.
1774      call. If it's ALT it is an alternation in a nested call. If it is      If it's ALT it is an alternation in a nested call. An ACCEPT is effectively
1775      END it's the end of the outer call. All can be handled by the same code. */      an ALT. If it is END it's the end of the outer call. All can be handled by
1776        the same code. Note that we must not include the OP_KETRxxx opcodes here,
1777        because they all imply an unlimited repeat. */
1778    
1779      case OP_ALT:      case OP_ALT:
1780      case OP_KET:      case OP_KET:
     case OP_KETRMAX:  
     case OP_KETRMIN:  
1781      case OP_END:      case OP_END:
1782        case OP_ACCEPT:
1783        case OP_ASSERT_ACCEPT:
1784      if (length < 0) length = branchlength;      if (length < 0) length = branchlength;
1785        else if (length != branchlength) return -1;        else if (length != branchlength) return -1;
1786      if (*cc != OP_ALT) return length;      if (*cc != OP_ALT) return length;
# Line 864  for (;;) Line 1788  for (;;)
1788      branchlength = 0;      branchlength = 0;
1789      break;      break;
1790    
1791        /* A true recursion implies not fixed length, but a subroutine call may
1792        be OK. If the subroutine is a forward reference, we can't deal with
1793        it until the end of the pattern, so return -3. */
1794    
1795        case OP_RECURSE:
1796        if (!atend) return -3;
1797        cs = ce = (pcre_uchar *)cd->start_code + GET(cc, 1);  /* Start subpattern */
1798        do ce += GET(ce, 1); while (*ce == OP_ALT);           /* End subpattern */
1799        if (cc > cs && cc < ce) return -1;                    /* Recursion */
1800        d = find_fixedlength(cs + IMM2_SIZE, utf, atend, cd);
1801        if (d < 0) return d;
1802        branchlength += d;
1803        cc += 1 + LINK_SIZE;
1804        break;
1805    
1806      /* Skip over assertive subpatterns */      /* Skip over assertive subpatterns */
1807    
1808      case OP_ASSERT:      case OP_ASSERT:
# Line 871  for (;;) Line 1810  for (;;)
1810      case OP_ASSERTBACK:      case OP_ASSERTBACK:
1811      case OP_ASSERTBACK_NOT:      case OP_ASSERTBACK_NOT:
1812      do cc += GET(cc, 1); while (*cc == OP_ALT);      do cc += GET(cc, 1); while (*cc == OP_ALT);
1813      /* Fall through */      cc += PRIV(OP_lengths)[*cc];
1814        break;
1815    
1816      /* Skip over things that don't match chars */      /* Skip over things that don't match chars */
1817    
1818      case OP_REVERSE:      case OP_MARK:
1819      case OP_BRANUMBER:      case OP_PRUNE_ARG:
1820      case OP_CREF:      case OP_SKIP_ARG:
1821      case OP_OPT:      case OP_THEN_ARG:
1822        cc += cc[1] + PRIV(OP_lengths)[*cc];
1823        break;
1824    
1825      case OP_CALLOUT:      case OP_CALLOUT:
     case OP_SOD:  
     case OP_SOM:  
     case OP_EOD:  
     case OP_EODN:  
1826      case OP_CIRC:      case OP_CIRC:
1827        case OP_CIRCM:
1828        case OP_CLOSE:
1829        case OP_COMMIT:
1830        case OP_CREF:
1831        case OP_DEF:
1832      case OP_DOLL:      case OP_DOLL:
1833        case OP_DOLLM:
1834        case OP_EOD:
1835        case OP_EODN:
1836        case OP_FAIL:
1837        case OP_NCREF:
1838        case OP_NRREF:
1839      case OP_NOT_WORD_BOUNDARY:      case OP_NOT_WORD_BOUNDARY:
1840        case OP_PRUNE:
1841        case OP_REVERSE:
1842        case OP_RREF:
1843        case OP_SET_SOM:
1844        case OP_SKIP:
1845        case OP_SOD:
1846        case OP_SOM:
1847        case OP_THEN:
1848      case OP_WORD_BOUNDARY:      case OP_WORD_BOUNDARY:
1849      cc += _pcre_OP_lengths[*cc];      cc += PRIV(OP_lengths)[*cc];
1850      break;      break;
1851    
1852      /* Handle literal characters */      /* Handle literal characters */
1853    
1854      case OP_CHAR:      case OP_CHAR:
1855      case OP_CHARNC:      case OP_CHARI:
1856        case OP_NOT:
1857        case OP_NOTI:
1858      branchlength++;      branchlength++;
1859      cc += 2;      cc += 2;
1860  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF
1861      if ((options & PCRE_UTF8) != 0)      if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
       {  
       while ((*cc & 0xc0) == 0x80) cc++;  
       }  
1862  #endif  #endif
1863      break;      break;
1864    
# Line 909  for (;;) Line 1866  for (;;)
1866      need to skip over a multibyte character in UTF8 mode.  */      need to skip over a multibyte character in UTF8 mode.  */
1867    
1868      case OP_EXACT:      case OP_EXACT:
1869      branchlength += GET2(cc,1);      case OP_EXACTI:
1870      cc += 4;      case OP_NOTEXACT:
1871  #ifdef SUPPORT_UTF8      case OP_NOTEXACTI:
1872      if ((options & PCRE_UTF8) != 0)      branchlength += (int)GET2(cc,1);
1873        {      cc += 2 + IMM2_SIZE;
1874        while((*cc & 0x80) == 0x80) cc++;  #ifdef SUPPORT_UTF
1875        }      if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
1876  #endif  #endif
1877      break;      break;
1878    
1879      case OP_TYPEEXACT:      case OP_TYPEEXACT:
1880      branchlength += GET2(cc,1);      branchlength += GET2(cc,1);
1881      cc += 4;      if (cc[1 + IMM2_SIZE] == OP_PROP || cc[1 + IMM2_SIZE] == OP_NOTPROP)
1882          cc += 2;
1883        cc += 1 + IMM2_SIZE + 1;
1884      break;      break;
1885    
1886      /* Handle single-char matchers */      /* Handle single-char matchers */
1887    
1888      case OP_PROP:      case OP_PROP:
1889      case OP_NOTPROP:      case OP_NOTPROP:
1890      cc++;      cc += 2;
1891      /* Fall through */      /* Fall through */
1892    
1893        case OP_HSPACE:
1894        case OP_VSPACE:
1895        case OP_NOT_HSPACE:
1896        case OP_NOT_VSPACE:
1897      case OP_NOT_DIGIT:      case OP_NOT_DIGIT:
1898      case OP_DIGIT:      case OP_DIGIT:
1899      case OP_NOT_WHITESPACE:      case OP_NOT_WHITESPACE:
# Line 938  for (;;) Line 1901  for (;;)
1901      case OP_NOT_WORDCHAR:      case OP_NOT_WORDCHAR:
1902      case OP_WORDCHAR:      case OP_WORDCHAR:
1903      case OP_ANY:      case OP_ANY:
1904        case OP_ALLANY:
1905      branchlength++;      branchlength++;
1906      cc++;      cc++;
1907      break;      break;
1908    
1909      /* The single-byte matcher isn't allowed */      /* The single-byte matcher isn't allowed. This only happens in UTF-8 mode;
1910        otherwise \C is coded as OP_ALLANY. */
1911    
1912      case OP_ANYBYTE:      case OP_ANYBYTE:
1913      return -2;      return -2;
1914    
1915      /* Check a class for variable quantification */      /* Check a class for variable quantification */
1916    
1917  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || defined COMPILE_PCRE16 || defined COMPILE_PCRE32
1918      case OP_XCLASS:      case OP_XCLASS:
1919      cc += GET(cc, 1) - 33;      cc += GET(cc, 1) - PRIV(OP_lengths)[OP_CLASS];
1920      /* Fall through */      /* Fall through */
1921  #endif  #endif
1922    
1923      case OP_CLASS:      case OP_CLASS:
1924      case OP_NCLASS:      case OP_NCLASS:
1925      cc += 33;      cc += PRIV(OP_lengths)[OP_CLASS];
1926    
1927      switch (*cc)      switch (*cc)
1928        {        {
1929          case OP_CRPLUS:
1930          case OP_CRMINPLUS:
1931        case OP_CRSTAR:        case OP_CRSTAR:
1932        case OP_CRMINSTAR:        case OP_CRMINSTAR:
1933        case OP_CRQUERY:        case OP_CRQUERY:
# Line 969  for (;;) Line 1936  for (;;)
1936    
1937        case OP_CRRANGE:        case OP_CRRANGE:
1938        case OP_CRMINRANGE:        case OP_CRMINRANGE:
1939        if (GET2(cc,1) != GET2(cc,3)) return -1;        if (GET2(cc,1) != GET2(cc,1+IMM2_SIZE)) return -1;
1940        branchlength += GET2(cc,1);        branchlength += (int)GET2(cc,1);
1941        cc += 5;        cc += 1 + 2 * IMM2_SIZE;
1942        break;        break;
1943    
1944        default:        default:
# Line 981  for (;;) Line 1948  for (;;)
1948    
1949      /* Anything else is variable length */      /* Anything else is variable length */
1950    
1951      default:      case OP_ANYNL:
1952        case OP_BRAMINZERO:
1953        case OP_BRAPOS:
1954        case OP_BRAPOSZERO:
1955        case OP_BRAZERO:
1956        case OP_CBRAPOS:
1957        case OP_EXTUNI:
1958        case OP_KETRMAX:
1959        case OP_KETRMIN:
1960        case OP_KETRPOS:
1961        case OP_MINPLUS:
1962        case OP_MINPLUSI:
1963        case OP_MINQUERY:
1964        case OP_MINQUERYI:
1965        case OP_MINSTAR:
1966        case OP_MINSTARI:
1967        case OP_MINUPTO:
1968        case OP_MINUPTOI:
1969        case OP_NOTMINPLUS:
1970        case OP_NOTMINPLUSI:
1971        case OP_NOTMINQUERY:
1972        case OP_NOTMINQUERYI:
1973        case OP_NOTMINSTAR:
1974        case OP_NOTMINSTARI:
1975        case OP_NOTMINUPTO:
1976        case OP_NOTMINUPTOI:
1977        case OP_NOTPLUS:
1978        case OP_NOTPLUSI:
1979        case OP_NOTPOSPLUS:
1980        case OP_NOTPOSPLUSI:
1981        case OP_NOTPOSQUERY:
1982        case OP_NOTPOSQUERYI:
1983        case OP_NOTPOSSTAR:
1984        case OP_NOTPOSSTARI:
1985        case OP_NOTPOSUPTO:
1986        case OP_NOTPOSUPTOI:
1987        case OP_NOTQUERY:
1988        case OP_NOTQUERYI:
1989        case OP_NOTSTAR:
1990        case OP_NOTSTARI:
1991        case OP_NOTUPTO:
1992        case OP_NOTUPTOI:
1993        case OP_PLUS:
1994        case OP_PLUSI:
1995        case OP_POSPLUS:
1996        case OP_POSPLUSI:
1997        case OP_POSQUERY:
1998        case OP_POSQUERYI:
1999        case OP_POSSTAR:
2000        case OP_POSSTARI:
2001        case OP_POSUPTO:
2002        case OP_POSUPTOI:
2003        case OP_QUERY:
2004        case OP_QUERYI:
2005        case OP_REF:
2006        case OP_REFI:
2007        case OP_SBRA:
2008        case OP_SBRAPOS:
2009        case OP_SCBRA:
2010        case OP_SCBRAPOS:
2011        case OP_SCOND:
2012        case OP_SKIPZERO:
2013        case OP_STAR:
2014        case OP_STARI:
2015        case OP_TYPEMINPLUS:
2016        case OP_TYPEMINQUERY:
2017        case OP_TYPEMINSTAR:
2018        case OP_TYPEMINUPTO:
2019        case OP_TYPEPLUS:
2020        case OP_TYPEPOSPLUS:
2021        case OP_TYPEPOSQUERY:
2022        case OP_TYPEPOSSTAR:
2023        case OP_TYPEPOSUPTO:
2024        case OP_TYPEQUERY:
2025        case OP_TYPESTAR:
2026        case OP_TYPEUPTO:
2027        case OP_UPTO:
2028        case OP_UPTOI:
2029      return -1;      return -1;
2030    
2031        /* Catch unrecognized opcodes so that when new ones are added they
2032        are not forgotten, as has happened in the past. */
2033    
2034        default:
2035        return -4;
2036      }      }
2037    }    }
2038  /* Control never gets here */  /* Control never gets here */
# Line 992  for (;;) Line 2042  for (;;)
2042    
2043    
2044  /*************************************************  /*************************************************
2045  *    Scan compiled regex for numbered bracket    *  *    Scan compiled regex for specific bracket    *
2046  *************************************************/  *************************************************/
2047    
2048  /* This little function scans through a compiled pattern until it finds a  /* This little function scans through a compiled pattern until it finds a
2049  capturing bracket with the given number.  capturing bracket with the given number, or, if the number is negative, an
2050    instance of OP_REVERSE for a lookbehind. The function is global in the C sense
2051    so that it can be called from pcre_study() when finding the minimum matching
2052    length.
2053    
2054  Arguments:  Arguments:
2055    code        points to start of expression    code        points to start of expression
2056    utf8        TRUE in UTF-8 mode    utf         TRUE in UTF-8 / UTF-16 / UTF-32 mode
2057    number      the required bracket number    number      the required bracket number or negative to find a lookbehind
2058    
2059  Returns:      pointer to the opcode for the bracket, or NULL if not found  Returns:      pointer to the opcode for the bracket, or NULL if not found
2060  */  */
2061    
2062  static const uschar *  const pcre_uchar *
2063  find_bracket(const uschar *code, BOOL utf8, int number)  PRIV(find_bracket)(const pcre_uchar *code, BOOL utf, int number)
2064  {  {
 #ifndef SUPPORT_UTF8  
 utf8 = utf8;               /* Stop pedantic compilers complaining */  
 #endif  
   
2065  for (;;)  for (;;)
2066    {    {
2067    register int c = *code;    register pcre_uchar c = *code;
2068    
2069    if (c == OP_END) return NULL;    if (c == OP_END) return NULL;
2070    else if (c > OP_BRA)  
2071      /* XCLASS is used for classes that cannot be represented just by a bit
2072      map. This includes negated single high-valued characters. The length in
2073      the table is zero; the actual length is stored in the compiled code. */
2074    
2075      if (c == OP_XCLASS) code += GET(code, 1);
2076    
2077      /* Handle recursion */
2078    
2079      else if (c == OP_REVERSE)
2080        {
2081        if (number < 0) return (pcre_uchar *)code;
2082        code += PRIV(OP_lengths)[c];
2083        }
2084    
2085      /* Handle capturing bracket */
2086    
2087      else if (c == OP_CBRA || c == OP_SCBRA ||
2088               c == OP_CBRAPOS || c == OP_SCBRAPOS)
2089      {      {
2090      int n = c - OP_BRA;      int n = (int)GET2(code, 1+LINK_SIZE);
2091      if (n > EXTRACT_BASIC_MAX) n = GET2(code, 2+LINK_SIZE);      if (n == number) return (pcre_uchar *)code;
2092      if (n == number) return (uschar *)code;      code += PRIV(OP_lengths)[c];
     code += _pcre_OP_lengths[OP_BRA];  
2093      }      }
2094    
2095      /* Otherwise, we can get the item's length from the table, except that for
2096      repeated character types, we have to test for \p and \P, which have an extra
2097      two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2098      must add in its length. */
2099    
2100    else    else
2101      {      {
2102      code += _pcre_OP_lengths[c];      switch(c)
2103          {
2104          case OP_TYPESTAR:
2105          case OP_TYPEMINSTAR:
2106          case OP_TYPEPLUS:
2107          case OP_TYPEMINPLUS:
2108          case OP_TYPEQUERY:
2109          case OP_TYPEMINQUERY:
2110          case OP_TYPEPOSSTAR:
2111          case OP_TYPEPOSPLUS:
2112          case OP_TYPEPOSQUERY:
2113          if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2114          break;
2115    
2116  #ifdef SUPPORT_UTF8        case OP_TYPEUPTO:
2117          case OP_TYPEMINUPTO:
2118          case OP_TYPEEXACT:
2119          case OP_TYPEPOSUPTO:
2120          if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2121            code += 2;
2122          break;
2123    
2124      /* In UTF-8 mode, opcodes that are followed by a character may be followed        case OP_MARK:
2125      by a multi-byte character. The length in the table is a minimum, so we have        case OP_PRUNE_ARG:
2126      to scan along to skip the extra bytes. All opcodes are less than 128, so we        case OP_SKIP_ARG:
2127      can use relatively efficient code. */        code += code[1];
2128          break;
2129    
2130      if (utf8) switch(c)        case OP_THEN_ARG:
2131          code += code[1];
2132          break;
2133          }
2134    
2135        /* Add in the fixed length from the table */
2136    
2137        code += PRIV(OP_lengths)[c];
2138    
2139      /* In UTF-8 mode, opcodes that are followed by a character may be followed by
2140      a multi-byte character. The length in the table is a minimum, so we have to
2141      arrange to skip the extra bytes. */
2142    
2143    #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2144        if (utf) switch(c)
2145        {        {
2146        case OP_CHAR:        case OP_CHAR:
2147        case OP_CHARNC:        case OP_CHARI:
2148        case OP_EXACT:        case OP_EXACT:
2149          case OP_EXACTI:
2150        case OP_UPTO:        case OP_UPTO:
2151          case OP_UPTOI:
2152        case OP_MINUPTO:        case OP_MINUPTO:
2153          case OP_MINUPTOI:
2154          case OP_POSUPTO:
2155          case OP_POSUPTOI:
2156        case OP_STAR:        case OP_STAR:
2157          case OP_STARI:
2158        case OP_MINSTAR:        case OP_MINSTAR:
2159          case OP_MINSTARI:
2160          case OP_POSSTAR:
2161          case OP_POSSTARI:
2162        case OP_PLUS:        case OP_PLUS:
2163          case OP_PLUSI:
2164        case OP_MINPLUS:        case OP_MINPLUS:
2165          case OP_MINPLUSI:
2166          case OP_POSPLUS:
2167          case OP_POSPLUSI:
2168        case OP_QUERY:        case OP_QUERY:
2169          case OP_QUERYI:
2170        case OP_MINQUERY:        case OP_MINQUERY:
2171        while ((*code & 0xc0) == 0x80) code++;        case OP_MINQUERYI:
2172        break;        case OP_POSQUERY:
2173          case OP_POSQUERYI:
2174        /* XCLASS is used for classes that cannot be represented just by a bit        if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
       map. This includes negated single high-valued characters. The length in  
       the table is zero; the actual length is stored in the compiled code. */  
   
       case OP_XCLASS:  
       code += GET(code, 1) + 1;  
2175        break;        break;
2176        }        }
2177    #else
2178        (void)(utf);  /* Keep compiler happy by referencing function argument */
2179  #endif  #endif
2180      }      }
2181    }    }
# Line 1075  instance of OP_RECURSE. Line 2192  instance of OP_RECURSE.
2192    
2193  Arguments:  Arguments:
2194    code        points to start of expression    code        points to start of expression
2195    utf8        TRUE in UTF-8 mode    utf         TRUE in UTF-8 / UTF-16 / UTF-32 mode
2196    
2197  Returns:      pointer to the opcode for OP_RECURSE, or NULL if not found  Returns:      pointer to the opcode for OP_RECURSE, or NULL if not found
2198  */  */
2199    
2200  static const uschar *  static const pcre_uchar *
2201  find_recurse(const uschar *code, BOOL utf8)  find_recurse(const pcre_uchar *code, BOOL utf)
2202  {  {
 #ifndef SUPPORT_UTF8  
 utf8 = utf8;               /* Stop pedantic compilers complaining */  
 #endif  
   
2203  for (;;)  for (;;)
2204    {    {
2205    register int c = *code;    register pcre_uchar c = *code;
2206    if (c == OP_END) return NULL;    if (c == OP_END) return NULL;
2207    else if (c == OP_RECURSE) return code;    if (c == OP_RECURSE) return code;
2208    else if (c > OP_BRA)  
2209      {    /* XCLASS is used for classes that cannot be represented just by a bit
2210      code += _pcre_OP_lengths[OP_BRA];    map. This includes negated single high-valued characters. The length in
2211      }    the table is zero; the actual length is stored in the compiled code. */
2212    
2213      if (c == OP_XCLASS) code += GET(code, 1);
2214    
2215      /* Otherwise, we can get the item's length from the table, except that for
2216      repeated character types, we have to test for \p and \P, which have an extra
2217      two bytes of parameters, and for MARK/PRUNE/SKIP/THEN with an argument, we
2218      must add in its length. */
2219    
2220    else    else
2221      {      {
2222      code += _pcre_OP_lengths[c];      switch(c)
2223          {
2224          case OP_TYPESTAR:
2225          case OP_TYPEMINSTAR:
2226          case OP_TYPEPLUS:
2227          case OP_TYPEMINPLUS:
2228          case OP_TYPEQUERY:
2229          case OP_TYPEMINQUERY:
2230          case OP_TYPEPOSSTAR:
2231          case OP_TYPEPOSPLUS:
2232          case OP_TYPEPOSQUERY:
2233          if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2234          break;
2235    
2236          case OP_TYPEPOSUPTO:
2237          case OP_TYPEUPTO:
2238          case OP_TYPEMINUPTO:
2239          case OP_TYPEEXACT:
2240          if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2241            code += 2;
2242          break;
2243    
2244          case OP_MARK:
2245          case OP_PRUNE_ARG:
2246          case OP_SKIP_ARG:
2247          code += code[1];
2248          break;
2249    
2250          case OP_THEN_ARG:
2251          code += code[1];
2252          break;
2253          }
2254    
2255        /* Add in the fixed length from the table */
2256    
2257  #ifdef SUPPORT_UTF8      code += PRIV(OP_lengths)[c];
2258    
2259      /* In UTF-8 mode, opcodes that are followed by a character may be followed      /* In UTF-8 mode, opcodes that are followed by a character may be followed
2260      by a multi-byte character. The length in the table is a minimum, so we have      by a multi-byte character. The length in the table is a minimum, so we have
2261      to scan along to skip the extra bytes. All opcodes are less than 128, so we      to arrange to skip the extra bytes. */
     can use relatively efficient code. */  
2262    
2263      if (utf8) switch(c)  #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2264        if (utf) switch(c)
2265        {        {
2266        case OP_CHAR:        case OP_CHAR:
2267        case OP_CHARNC:        case OP_CHARI:
2268          case OP_NOT:
2269          case OP_NOTI:
2270        case OP_EXACT:        case OP_EXACT:
2271          case OP_EXACTI:
2272          case OP_NOTEXACT:
2273          case OP_NOTEXACTI:
2274        case OP_UPTO:        case OP_UPTO:
2275          case OP_UPTOI:
2276          case OP_NOTUPTO:
2277          case OP_NOTUPTOI:
2278        case OP_MINUPTO:        case OP_MINUPTO:
2279          case OP_MINUPTOI:
2280          case OP_NOTMINUPTO:
2281          case OP_NOTMINUPTOI:
2282          case OP_POSUPTO:
2283          case OP_POSUPTOI:
2284          case OP_NOTPOSUPTO:
2285          case OP_NOTPOSUPTOI:
2286        case OP_STAR:        case OP_STAR:
2287          case OP_STARI:
2288          case OP_NOTSTAR:
2289          case OP_NOTSTARI:
2290        case OP_MINSTAR:        case OP_MINSTAR:
2291          case OP_MINSTARI:
2292          case OP_NOTMINSTAR:
2293          case OP_NOTMINSTARI:
2294          case OP_POSSTAR:
2295          case OP_POSSTARI:
2296          case OP_NOTPOSSTAR:
2297          case OP_NOTPOSSTARI:
2298        case OP_PLUS:        case OP_PLUS:
2299          case OP_PLUSI:
2300          case OP_NOTPLUS:
2301          case OP_NOTPLUSI:
2302        case OP_MINPLUS:        case OP_MINPLUS:
2303          case OP_MINPLUSI:
2304          case OP_NOTMINPLUS:
2305          case OP_NOTMINPLUSI:
2306          case OP_POSPLUS:
2307          case OP_POSPLUSI:
2308          case OP_NOTPOSPLUS:
2309          case OP_NOTPOSPLUSI:
2310        case OP_QUERY:        case OP_QUERY:
2311          case OP_QUERYI:
2312          case OP_NOTQUERY:
2313          case OP_NOTQUERYI:
2314        case OP_MINQUERY:        case OP_MINQUERY:
2315        while ((*code & 0xc0) == 0x80) code++;        case OP_MINQUERYI:
2316        break;        case OP_NOTMINQUERY:
2317          case OP_NOTMINQUERYI:
2318        /* XCLASS is used for classes that cannot be represented just by a bit        case OP_POSQUERY:
2319        map. This includes negated single high-valued characters. The length in        case OP_POSQUERYI:
2320        the table is zero; the actual length is stored in the compiled code. */        case OP_NOTPOSQUERY:
2321          case OP_NOTPOSQUERYI:
2322        case OP_XCLASS:        if (HAS_EXTRALEN(code[-1])) code += GET_EXTRALEN(code[-1]);
       code += GET(code, 1) + 1;  
2323        break;        break;
2324        }        }
2325    #else
2326        (void)(utf);  /* Keep compiler happy by referencing function argument */
2327  #endif  #endif
2328      }      }
2329    }    }
# Line 1143  for (;;) Line 2336  for (;;)
2336  *************************************************/  *************************************************/
2337    
2338  /* This function scans through a branch of a compiled pattern to see whether it  /* This function scans through a branch of a compiled pattern to see whether it
2339  can match the empty string or not. It is called only from could_be_empty()  can match the empty string or not. It is called from could_be_empty()
2340  below. Note that first_significant_code() skips over assertions. If we hit an  below and from compile_branch() when checking for an unlimited repeat of a
2341  unclosed bracket, we return "empty" - this means we've struck an inner bracket  group that can match nothing. Note that first_significant_code() skips over
2342  whose current branch will already have been scanned.  backward and negative forward assertions when its final argument is TRUE. If we
2343    hit an unclosed bracket, we return "empty" - this means we've struck an inner
2344    bracket whose current branch will already have been scanned.
2345    
2346  Arguments:  Arguments:
2347    code        points to start of search    code        points to start of search
2348    endcode     points to where to stop    endcode     points to where to stop
2349    utf8        TRUE if in UTF8 mode    utf         TRUE if in UTF-8 / UTF-16 / UTF-32 mode
2350      cd          contains pointers to tables etc.
2351    
2352  Returns:      TRUE if what is matched could be empty  Returns:      TRUE if what is matched could be empty
2353  */  */
2354    
2355  static BOOL  static BOOL
2356  could_be_empty_branch(const uschar *code, const uschar *endcode, BOOL utf8)  could_be_empty_branch(const pcre_uchar *code, const pcre_uchar *endcode,
2357      BOOL utf, compile_data *cd)
2358  {  {
2359  register int c;  register pcre_uchar c;
2360  for (code = first_significant_code(code + 1 + LINK_SIZE, NULL, 0, TRUE);  for (code = first_significant_code(code + PRIV(OP_lengths)[*code], TRUE);
2361       code < endcode;       code < endcode;
2362       code = first_significant_code(code + _pcre_OP_lengths[c], NULL, 0, TRUE))       code = first_significant_code(code + PRIV(OP_lengths)[c], TRUE))
2363    {    {
2364    const uschar *ccode;    const pcre_uchar *ccode;
2365    
2366    c = *code;    c = *code;
2367    
2368    if (c >= OP_BRA)    /* Skip over forward assertions; the other assertions are skipped by
2369      first_significant_code() with a TRUE final argument. */
2370    
2371      if (c == OP_ASSERT)
2372        {
2373        do code += GET(code, 1); while (*code == OP_ALT);
2374        c = *code;
2375        continue;
2376        }
2377    
2378      /* For a recursion/subroutine call, if its end has been reached, which
2379      implies a backward reference subroutine call, we can scan it. If it's a
2380      forward reference subroutine call, we can't. To detect forward reference
2381      we have to scan up the list that is kept in the workspace. This function is
2382      called only when doing the real compile, not during the pre-compile that
2383      measures the size of the compiled pattern. */
2384    
2385      if (c == OP_RECURSE)
2386      {      {
2387        const pcre_uchar *scode;
2388      BOOL empty_branch;      BOOL empty_branch;
     if (GET(code, 1) == 0) return TRUE;    /* Hit unclosed bracket */  
2389    
2390      /* Scan a closed bracket */      /* Test for forward reference */
2391    
2392        for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)
2393          if ((int)GET(scode, 0) == (int)(code + 1 - cd->start_code)) return TRUE;
2394    
2395        /* Not a forward reference, test for completed backward reference */
2396    
2397        empty_branch = FALSE;
2398        scode = cd->start_code + GET(code, 1);
2399        if (GET(scode, 1) == 0) return TRUE;    /* Unclosed */
2400    
2401        /* Completed backwards reference */
2402    
     empty_branch = FALSE;  
2403      do      do
2404        {        {
2405        if (!empty_branch && could_be_empty_branch(code, endcode, utf8))        if (could_be_empty_branch(scode, endcode, utf, cd))
2406            {
2407          empty_branch = TRUE;          empty_branch = TRUE;
2408            break;
2409            }
2410          scode += GET(scode, 1);
2411          }
2412        while (*scode == OP_ALT);
2413    
2414        if (!empty_branch) return FALSE;  /* All branches are non-empty */
2415        continue;
2416        }
2417    
2418      /* Groups with zero repeats can of course be empty; skip them. */
2419    
2420      if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO ||
2421          c == OP_BRAPOSZERO)
2422        {
2423        code += PRIV(OP_lengths)[c];
2424        do code += GET(code, 1); while (*code == OP_ALT);
2425        c = *code;
2426        continue;
2427        }
2428    
2429      /* A nested group that is already marked as "could be empty" can just be
2430      skipped. */
2431    
2432      if (c == OP_SBRA  || c == OP_SBRAPOS ||
2433          c == OP_SCBRA || c == OP_SCBRAPOS)
2434        {
2435        do code += GET(code, 1); while (*code == OP_ALT);
2436        c = *code;
2437        continue;
2438        }
2439    
2440      /* For other groups, scan the branches. */
2441    
2442      if (c == OP_BRA  || c == OP_BRAPOS ||
2443          c == OP_CBRA || c == OP_CBRAPOS ||
2444          c == OP_ONCE || c == OP_ONCE_NC ||
2445          c == OP_COND)
2446        {
2447        BOOL empty_branch;
2448        if (GET(code, 1) == 0) return TRUE;    /* Hit unclosed bracket */
2449    
2450        /* If a conditional group has only one branch, there is a second, implied,
2451        empty branch, so just skip over the conditional, because it could be empty.
2452        Otherwise, scan the individual branches of the group. */
2453    
2454        if (c == OP_COND && code[GET(code, 1)] != OP_ALT)
2455        code += GET(code, 1);        code += GET(code, 1);
2456        else
2457          {
2458          empty_branch = FALSE;
2459          do
2460            {
2461            if (!empty_branch && could_be_empty_branch(code, endcode, utf, cd))
2462              empty_branch = TRUE;
2463            code += GET(code, 1);
2464            }
2465          while (*code == OP_ALT);
2466          if (!empty_branch) return FALSE;   /* All branches are non-empty */
2467        }        }
2468      while (*code == OP_ALT);  
     if (!empty_branch) return FALSE;   /* All branches are non-empty */  
     code += 1 + LINK_SIZE;  
2469      c = *code;      c = *code;
2470        continue;
2471      }      }
2472    
2473    else switch (c)    /* Handle the other opcodes */
2474    
2475      switch (c)
2476      {      {
2477      /* Check for quantifiers after a class */      /* Check for quantifiers after a class. XCLASS is used for classes that
2478        cannot be represented just by a bit map. This includes negated single
2479        high-valued characters. The length in PRIV(OP_lengths)[] is zero; the
2480        actual length is stored in the compiled code, so we must update "code"
2481        here. */
2482    
2483  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2484      case OP_XCLASS:      case OP_XCLASS:
2485      ccode = code + GET(code, 1);      ccode = code += GET(code, 1);
2486      goto CHECK_CLASS_REPEAT;      goto CHECK_CLASS_REPEAT;
2487  #endif  #endif
2488    
2489      case OP_CLASS:      case OP_CLASS:
2490      case OP_NCLASS:      case OP_NCLASS:
2491      ccode = code + 33;      ccode = code + PRIV(OP_lengths)[OP_CLASS];
2492    
2493  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
2494      CHECK_CLASS_REPEAT:      CHECK_CLASS_REPEAT:
2495  #endif  #endif
2496    
# Line 1238  for (code = first_significant_code(code Line 2526  for (code = first_significant_code(code
2526      case OP_NOT_WORDCHAR:      case OP_NOT_WORDCHAR:
2527      case OP_WORDCHAR:      case OP_WORDCHAR:
2528      case OP_ANY:      case OP_ANY:
2529        case OP_ALLANY:
2530      case OP_ANYBYTE:      case OP_ANYBYTE:
2531      case OP_CHAR:      case OP_CHAR:
2532      case OP_CHARNC:      case OP_CHARI:
2533      case OP_NOT:      case OP_NOT:
2534        case OP_NOTI:
2535      case OP_PLUS:      case OP_PLUS:
2536      case OP_MINPLUS:      case OP_MINPLUS:
2537        case OP_POSPLUS:
2538      case OP_EXACT:      case OP_EXACT:
2539      case OP_NOTPLUS:      case OP_NOTPLUS:
2540      case OP_NOTMINPLUS:      case OP_NOTMINPLUS:
2541        case OP_NOTPOSPLUS:
2542      case OP_NOTEXACT:      case OP_NOTEXACT:
2543      case OP_TYPEPLUS:      case OP_TYPEPLUS:
2544      case OP_TYPEMINPLUS:      case OP_TYPEMINPLUS:
2545        case OP_TYPEPOSPLUS:
2546      case OP_TYPEEXACT:      case OP_TYPEEXACT:
2547      return FALSE;      return FALSE;
2548    
2549        /* These are going to continue, as they may be empty, but we have to
2550        fudge the length for the \p and \P cases. */
2551    
2552        case OP_TYPESTAR:
2553        case OP_TYPEMINSTAR:
2554        case OP_TYPEPOSSTAR:
2555        case OP_TYPEQUERY:
2556        case OP_TYPEMINQUERY:
2557        case OP_TYPEPOSQUERY:
2558        if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
2559        break;
2560    
2561        /* Same for these */
2562    
2563        case OP_TYPEUPTO:
2564        case OP_TYPEMINUPTO:
2565        case OP_TYPEPOSUPTO:
2566        if (code[1 + IMM2_SIZE] == OP_PROP || code[1 + IMM2_SIZE] == OP_NOTPROP)
2567          code += 2;
2568        break;
2569    
2570      /* End of branch */      /* End of branch */
2571    
2572      case OP_KET:      case OP_KET:
2573      case OP_KETRMAX:      case OP_KETRMAX:
2574      case OP_KETRMIN:      case OP_KETRMIN:
2575        case OP_KETRPOS:
2576      case OP_ALT:      case OP_ALT:
2577      return TRUE;      return TRUE;
2578    
2579      /* In UTF-8 mode, STAR, MINSTAR, QUERY, MINQUERY, UPTO, and MINUPTO  may be      /* In UTF-8 mode, STAR, MINSTAR, POSSTAR, QUERY, MINQUERY, POSQUERY, UPTO,
2580      followed by a multibyte character */      MINUPTO, and POSUPTO may be followed by a multibyte character */
2581    
2582  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF && !defined COMPILE_PCRE32
2583      case OP_STAR:      case OP_STAR:
2584        case OP_STARI:
2585      case OP_MINSTAR:      case OP_MINSTAR:
2586        case OP_MINSTARI:
2587        case OP_POSSTAR:
2588        case OP_POSSTARI:
2589      case OP_QUERY:      case OP_QUERY:
2590        case OP_QUERYI:
2591      case OP_MINQUERY:      case OP_MINQUERY:
2592        case OP_MINQUERYI:
2593        case OP_POSQUERY:
2594        case OP_POSQUERYI:
2595        if (utf && HAS_EXTRALEN(code[1])) code += GET_EXTRALEN(code[1]);
2596        break;
2597    
2598      case OP_UPTO:      case OP_UPTO:
2599        case OP_UPTOI:
2600      case OP_MINUPTO:      case OP_MINUPTO:
2601      if (utf8) while ((code[2] & 0xc0) == 0x80) code++;      case OP_MINUPTOI:
2602        case OP_POSUPTO:
2603        case OP_POSUPTOI:
2604        if (utf && HAS_EXTRALEN(code[1 + IMM2_SIZE])) code += GET_EXTRALEN(code[1 + IMM2_SIZE]);
2605      break;      break;
2606  #endif  #endif
2607    
2608        /* MARK, and PRUNE/SKIP/THEN with an argument must skip over the argument
2609        string. */
2610    
2611        case OP_MARK:
2612        case OP_PRUNE_ARG:
2613        case OP_SKIP_ARG:
2614        code += code[1];
2615        break;
2616    
2617        case OP_THEN_ARG:
2618        code += code[1];
2619        break;
2620    
2621        /* None of the remaining opcodes are required to match a character. */
2622    
2623        default:
2624        break;
2625      }      }
2626    }    }
2627    
# Line 1290  return TRUE; Line 2638  return TRUE;
2638  the current branch of the current pattern to see if it could match the empty  the current branch of the current pattern to see if it could match the empty
2639  string. If it could, we must look outwards for branches at other levels,  string. If it could, we must look outwards for branches at other levels,
2640  stopping when we pass beyond the bracket which is the subject of the recursion.  stopping when we pass beyond the bracket which is the subject of the recursion.
2641    This function is called only during the real compile, not during the
2642    pre-compile.
2643    
2644  Arguments:  Arguments:
2645    code        points to start of the recursion    code        points to start of the recursion
2646    endcode     points to where to stop (current RECURSE item)    endcode     points to where to stop (current RECURSE item)
2647    bcptr       points to the chain of current (unclosed) branch starts    bcptr       points to the chain of current (unclosed) branch starts
2648    utf8        TRUE if in UTF-8 mode    utf         TRUE if in UTF-8 / UTF-16 / UTF-32 mode
2649      cd          pointers to tables etc
2650    
2651  Returns:      TRUE if what is matched could be empty  Returns:      TRUE if what is matched could be empty
2652  */  */
2653    
2654  static BOOL  static BOOL
2655  could_be_empty(const uschar *code, const uschar *endcode, branch_chain *bcptr,  could_be_empty(const pcre_uchar *code, const pcre_uchar *endcode,
2656    BOOL utf8)    branch_chain *bcptr, BOOL utf, compile_data *cd)
2657  {  {
2658  while (bcptr != NULL && bcptr->current >= code)  while (bcptr != NULL && bcptr->current_branch >= code)
2659    {    {
2660    if (!could_be_empty_branch(bcptr->current, endcode, utf8)) return FALSE;    if (!could_be_empty_branch(bcptr->current_branch, endcode, utf, cd))
2661        return FALSE;
2662    bcptr = bcptr->outer;    bcptr = bcptr->outer;
2663    }    }
2664  return TRUE;  return TRUE;
# Line 1319  return TRUE; Line 2671  return TRUE;
2671  *************************************************/  *************************************************/
2672    
2673  /* This function is called when the sequence "[:" or "[." or "[=" is  /* This function is called when the sequence "[:" or "[." or "[=" is
2674  encountered in a character class. It checks whether this is followed by an  encountered in a character class. It checks whether this is followed by a
2675  optional ^ and then a sequence of letters, terminated by a matching ":]" or  sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
2676  ".]" or "=]".  reach an unescaped ']' without the special preceding character, return FALSE.
2677    
2678    Originally, this function only recognized a sequence of letters between the
2679    terminators, but it seems that Perl recognizes any sequence of characters,
2680    though of course unknown POSIX names are subsequently rejected. Perl gives an
2681    "Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
2682    didn't consider this to be a POSIX class. Likewise for [:1234:].
2683    
2684    The problem in trying to be exactly like Perl is in the handling of escapes. We
2685    have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
2686    class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
2687    below handles the special case of \], but does not try to do any other escape
2688    processing. This makes it different from Perl for cases such as [:l\ower:]
2689    where Perl recognizes it as the POSIX class "lower" but PCRE does not recognize
2690    "l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,
2691    I think.
2692    
2693    A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
2694    It seems that the appearance of a nested POSIX class supersedes an apparent
2695    external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
2696    a digit.
2697    
2698    In Perl, unescaped square brackets may also appear as part of class names. For
2699    example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
2700    [:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
2701    seem right at all. PCRE does not allow closing square brackets in POSIX class
2702    names.
2703    
2704  Argument:  Arguments:
2705    ptr      pointer to the initial [    ptr      pointer to the initial [
2706    endptr   where to return the end pointer    endptr   where to return the end pointer
   cd       pointer to compile data  
2707    
2708  Returns:   TRUE or FALSE  Returns:   TRUE or FALSE
2709  */  */
2710    
2711  static BOOL  static BOOL
2712  check_posix_syntax(const uschar *ptr, const uschar **endptr, compile_data *cd)  check_posix_syntax(const pcre_uchar *ptr, const pcre_uchar **endptr)
2713  {  {
2714  int terminator;          /* Don't combine these lines; the Solaris cc */  pcre_uchar terminator;          /* Don't combine these lines; the Solaris cc */
2715  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */
2716  if (*(++ptr) == '^') ptr++;  for (++ptr; *ptr != 0; ptr++)
 while ((cd->ctypes[*ptr] & ctype_letter) != 0) ptr++;  
 if (*ptr == terminator && ptr[1] == ']')  
2717    {    {
2718    *endptr = ptr;    if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2719    return TRUE;      ptr++;
2720      else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
2721      else
2722        {
2723        if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2724          {
2725          *endptr = ptr;
2726          return TRUE;
2727          }
2728        if (*ptr == CHAR_LEFT_SQUARE_BRACKET &&
2729             (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
2730              ptr[1] == CHAR_EQUALS_SIGN) &&
2731            check_posix_syntax(ptr, endptr))
2732          return FALSE;
2733        }
2734    }    }
2735  return FALSE;  return FALSE;
2736  }  }
# Line 1364  Returns:     a value representing the na Line 2753  Returns:     a value representing the na
2753  */  */
2754    
2755  static int  static int
2756  check_posix_name(const uschar *ptr, int len)  check_posix_name(const pcre_uchar *ptr, int len)
2757  {  {
2758    const char *pn = posix_names;
2759  register int yield = 0;  register int yield = 0;
2760  while (posix_name_lengths[yield] != 0)  while (posix_name_lengths[yield] != 0)
2761    {    {
2762    if (len == posix_name_lengths[yield] &&    if (len == posix_name_lengths[yield] &&
2763      strncmp((const char *)ptr, posix_names[yield], len) == 0) return yield;      STRNCMP_UC_C8(ptr, pn, (unsigned int)len) == 0) return yield;
2764      pn += posix_name_lengths[yield] + 1;
2765    yield++;    yield++;
2766    }    }
2767  return -1;  return -1;
# Line 1385  return -1; Line 2776  return -1;
2776  that is referenced. This means that groups can be replicated for fixed  that is referenced. This means that groups can be replicated for fixed
2777  repetition simply by copying (because the recursion is allowed to refer to  repetition simply by copying (because the recursion is allowed to refer to
2778  earlier groups that are outside the current group). However, when a group is  earlier groups that are outside the current group). However, when a group is
2779  optional (i.e. the minimum quantifier is zero), OP_BRAZERO is inserted before  optional (i.e. the minimum quantifier is zero), OP_BRAZERO or OP_SKIPZERO is
2780  it, after it has been compiled. This means that any OP_RECURSE items within it  inserted before it, after it has been compiled. This means that any OP_RECURSE
2781  that refer to the group itself or any contained groups have to have their  items within it that refer to the group itself or any contained groups have to
2782  offsets adjusted. That is the job of this function. Before it is called, the  have their offsets adjusted. That one of the jobs of this function. Before it
2783  partially compiled regex must be temporarily terminated with OP_END.  is called, the partially compiled regex must be temporarily terminated with
2784    OP_END.
2785    
2786    This function has been extended with the possibility of forward references for
2787    recursions and subroutine calls. It must also check the list of such references
2788    for the group we are dealing with. If it finds that one of the recursions in
2789    the current group is on this list, it adjusts the offset in the list, not the
2790    value in the reference (which is a group number).
2791    
2792  Arguments:  Arguments:
2793    group      points to the start of the group    group      points to the start of the group
2794    adjust     the amount by which the group is to be moved    adjust     the amount by which the group is to be moved
2795    utf8       TRUE in UTF-8 mode    utf        TRUE in UTF-8 / UTF-16 / UTF-32 mode
2796    cd         contains pointers to tables etc.    cd         contains pointers to tables etc.
2797      save_hwm   the hwm forward reference pointer at the start of the group
2798    
2799  Returns:     nothing  Returns:     nothing
2800  */  */
2801    
2802  static void  static void
2803  adjust_recurse(uschar *group, int adjust, BOOL utf8, compile_data *cd)  adjust_recurse(pcre_uchar *group, int adjust, BOOL utf, compile_data *cd,
2804      pcre_uchar *save_hwm)
2805  {  {
2806  uschar *ptr = group;  pcre_uchar *ptr = group;
2807  while ((ptr = (uschar *)find_recurse(ptr, utf8)) != NULL)  
2808    while ((ptr = (pcre_uchar *)find_recurse(ptr, utf)) != NULL)
2809    {    {
2810    int offset = GET(ptr, 1);    int offset;
2811    if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust);    pcre_uchar *hc;
2812    
2813      /* See if this recursion is on the forward reference list. If so, adjust the
2814      reference. */
2815    
2816      for (hc = save_hwm; hc < cd->hwm; hc += LINK_SIZE)
2817        {
2818        offset = (int)GET(hc, 0);
2819        if (cd->start_code + offset == ptr + 1)
2820          {
2821          PUT(hc, 0, offset + adjust);
2822          break;
2823          }
2824        }
2825    
2826      /* Otherwise, adjust the recursion offset if it's after the start of this
2827      group. */
2828    
2829      if (hc >= cd->hwm)
2830        {
2831        offset = (int)GET(ptr, 1);
2832        if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust);
2833        }
2834    
2835    ptr += 1 + LINK_SIZE;    ptr += 1 + LINK_SIZE;
2836    }    }
2837  }  }
# Line 1429  Arguments: Line 2853  Arguments:
2853  Returns:         new code pointer  Returns:         new code pointer
2854  */  */
2855    
2856  static uschar *  static pcre_uchar *
2857  auto_callout(uschar *code, const uschar *ptr, compile_data *cd)  auto_callout(pcre_uchar *code, const pcre_uchar *ptr, compile_data *cd)
2858  {  {
2859  *code++ = OP_CALLOUT;  *code++ = OP_CALLOUT;
2860  *code++ = 255;  *code++ = 255;
2861  PUT(code, 0, ptr - cd->start_pattern);  /* Pattern offset */  PUT(code, 0, (int)(ptr - cd->start_pattern));  /* Pattern offset */
2862  PUT(code, LINK_SIZE, 0);                /* Default length */  PUT(code, LINK_SIZE, 0);                       /* Default length */
2863  return code + 2*LINK_SIZE;  return code + 2 * LINK_SIZE;
2864  }  }
2865    
2866    
# Line 1458  Returns:             nothing Line 2882  Returns:             nothing
2882  */  */
2883    
2884  static void  static void
2885  complete_callout(uschar *previous_callout, const uschar *ptr, compile_data *cd)  complete_callout(pcre_uchar *previous_callout, const pcre_uchar *ptr, compile_data *cd)
2886  {  {
2887  int length = ptr - cd->start_pattern - GET(previous_callout, 2);  int length = (int)(ptr - cd->start_pattern - GET(previous_callout, 2));
2888  PUT(previous_callout, 2 + LINK_SIZE, length);  PUT(previous_callout, 2 + LINK_SIZE, length);
2889  }  }
2890    
# Line 1472  PUT(previous_callout, 2 + LINK_SIZE, len Line 2896  PUT(previous_callout, 2 + LINK_SIZE, len
2896  *************************************************/  *************************************************/
2897    
2898  /* This function is passed the start and end of a class range, in UTF-8 mode  /* This function is passed the start and end of a class range, in UTF-8 mode
2899  with UCP support. It searches up the characters, looking for internal ranges of  with UCP support. It searches up the characters, looking for ranges of
2900  characters in the "other" case. Each call returns the next one, updating the  characters in the "other" case. Each call returns the next one, updating the
2901  start address.  start address. A character with multiple other cases is returned on its own
2902    with a special return value.
2903    
2904  Arguments:  Arguments:
2905    cptr        points to starting character value; updated    cptr        points to starting character value; updated
# Line 1482  Arguments: Line 2907  Arguments:
2907    ocptr       where to put start of othercase range    ocptr       where to put start of othercase range
2908    odptr       where to put end of othercase range    odptr       where to put end of othercase range
2909    
2910  Yield:        TRUE when range returned; FALSE when no more  Yield:        -1 when no more
2911                   0 when a range is returned
2912                  >0 the CASESET offset for char with multiple other cases
2913                    in this case, ocptr contains the original
2914  */  */
2915    
2916  static BOOL  static int
2917  get_othercase_range(int *cptr, int d, int *ocptr, int *odptr)  get_othercase_range(pcre_uint32 *cptr, pcre_uint32 d, pcre_uint32 *ocptr,
2918      pcre_uint32 *odptr)
2919  {  {
2920  int c, chartype, othercase, next;  pcre_uint32 c, othercase, next;
2921    unsigned int co;
2922    
2923    /* Find the first character that has an other case. If it has multiple other
2924    cases, return its case offset value. */
2925    
2926  for (c = *cptr; c <= d; c++)  for (c = *cptr; c <= d; c++)
2927    {    {
2928    if (_pcre_ucp_findchar(c, &chartype, &othercase) == ucp_L && othercase != 0)    if ((co = UCD_CASESET(c)) != 0)
2929      break;      {
2930        *ocptr = c++;   /* Character that has the set */
2931        *cptr = c;      /* Rest of input range */
2932        return (int)co;
2933        }
2934      if ((othercase = UCD_OTHERCASE(c)) != c) break;
2935    }    }
2936    
2937  if (c > d) return FALSE;  if (c > d) return -1;  /* Reached end of range */
2938    
2939  *ocptr = othercase;  *ocptr = othercase;
2940  next = othercase + 1;  next = othercase + 1;
2941    
2942  for (++c; c <= d; c++)  for (++c; c <= d; c++)
2943    {    {
2944    if (_pcre_ucp_findchar(c, &chartype, &othercase) != ucp_L ||    if (UCD_OTHERCASE(c) != next) break;
         othercase != next)  
     break;  
2945    next++;    next++;
2946    }    }
2947    
2948  *odptr = next - 1;  *odptr = next - 1;     /* End of othercase range */
2949  *cptr = c;  *cptr = c;             /* Rest of input range */
2950    return 0;
 return TRUE;  
2951  }  }
2952  #endif  /* SUPPORT_UCP */  
2953    
2954    
2955  /*************************************************  /*************************************************
2956  *           Compile one branch                   *  *        Check a character and a property        *
2957  *************************************************/  *************************************************/
2958    
2959  /* Scan the pattern, compiling it into the code vector. If the options are  /* This function is called by check_auto_possessive() when a property item
2960  changed during the branch, the pointer is used to change the external options  is adjacent to a fixed character.
 bits.  
2961    
2962  Arguments:  Arguments:
2963    optionsptr     pointer to the option bits    c            the character
2964    brackets       points to number of extracting brackets used    ptype        the property type
2965    codeptr        points to the pointer to the current code point    pdata        the data for the type
2966    ptrptr         points to the current pattern pointer    negated      TRUE if it's a negated property (\P or \p{^)
   errorcodeptr   points to error code variable  
   firstbyteptr   set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)  
   reqbyteptr     set to the last literal character required, else < 0  
   bcptr          points to current branch chain  
   cd             contains pointers to tables etc.  
2967    
2968  Returns:         TRUE on success  Returns:       TRUE if auto-possessifying is OK
                  FALSE, with *errorcodeptr set non-zero on error  
2969  */  */
2970    
2971  static BOOL  static BOOL
2972  compile_branch(int *optionsptr, int *brackets, uschar **codeptr,  check_char_prop(pcre_uint32 c, unsigned int ptype, unsigned int pdata, BOOL negated)
   const uschar **ptrptr, int *errorcodeptr, int *firstbyteptr,  
   int *reqbyteptr, branch_chain *bcptr, compile_data *cd)  
2973  {  {
2974  int repeat_type, op_type;  #ifdef SUPPORT_UCP
2975  int repeat_min = 0, repeat_max = 0;      /* To please picky compilers */  const pcre_uint32 *p;
 int bravalue = 0;  
 int greedy_default, greedy_non_default;  
 int firstbyte, reqbyte;  
 int zeroreqbyte, zerofirstbyte;  
 int req_caseopt, reqvary, tempreqvary;  
 int condcount = 0;  
 int options = *optionsptr;  
 int after_manual_callout = 0;  
 register int c;  
 register uschar *code = *codeptr;  
 uschar *tempcode;  
 BOOL inescq = FALSE;  
 BOOL groupsetfirstbyte = FALSE;  
 const uschar *ptr = *ptrptr;  
 const uschar *tempptr;  
 uschar *previous = NULL;  
 uschar *previous_callout = NULL;  
 uschar classbits[32];  
   
 #ifdef SUPPORT_UTF8  
 BOOL class_utf8;  
 BOOL utf8 = (options & PCRE_UTF8) != 0;  
 uschar *class_utf8data;  
 uschar utf8_char[6];  
 #else  
 BOOL utf8 = FALSE;  
2976  #endif  #endif
2977    
2978  /* Set up the default and non-default settings for greediness */  const ucd_record *prop = GET_UCD(c);
   
 greedy_default = ((options & PCRE_UNGREEDY) != 0);  
 greedy_non_default = greedy_default ^ 1;  
2979    
2980  /* Initialize no first byte, no required byte. REQ_UNSET means "no char  switch(ptype)
2981  matching encountered yet". It gets changed to REQ_NONE if we hit something that    {
2982  matches a non-fixed char first char; reqbyte just remains unset if we never    case PT_LAMP:
2983  find one.    return (prop->chartype == ucp_Lu ||
2984              prop->chartype == ucp_Ll ||
2985              prop->chartype == ucp_Lt) == negated;
2986    
2987      case PT_GC:
2988      return (pdata == PRIV(ucp_gentype)[prop->chartype]) == negated;
2989    
2990      case PT_PC:
2991      return (pdata == prop->chartype) == negated;
2992    
2993      case PT_SC:
2994      return (pdata == prop->script) == negated;
2995    
2996      /* These are specials */
2997    
2998      case PT_ALNUM:
2999      return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
3000              PRIV(ucp_gentype)[prop->chartype] == ucp_N) == negated;
3001    
3002      case PT_SPACE:    /* Perl space */
3003      return (PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
3004              c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
3005              == negated;
3006    
3007      case PT_PXSPACE:  /* POSIX space */
3008      return (PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
3009              c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
3010              c == CHAR_FF || c == CHAR_CR)
3011              == negated;
3012    
3013      case PT_WORD:
3014      return (PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
3015              PRIV(ucp_gentype)[prop->chartype] == ucp_N ||
3016              c == CHAR_UNDERSCORE) == negated;
3017    
3018    #ifdef SUPPORT_UCP
3019      case PT_CLIST:
3020      p = PRIV(ucd_caseless_sets) + prop->caseset;
3021      for (;;)
3022        {
3023        if ((unsigned int)c < *p) return !negated;
3024        if ((unsigned int)c == *p++) return negated;
3025        }
3026      break;  /* Control never reaches here */
3027    #endif
3028      }
3029    
3030  When we hit a repeat whose minimum is zero, we may have to adjust these values  return FALSE;
3031  to take the zero repeat into account. This is implemented by setting them to  }
3032  zerofirstbyte and zeroreqbyte when such a repeat is encountered. The individual  #endif  /* SUPPORT_UCP */
 item types that can be repeated set these backoff variables appropriately. */  
3033    
 firstbyte = reqbyte = zerofirstbyte = zeroreqbyte = REQ_UNSET;  
3034    
 /* The variable req_caseopt contains either the REQ_CASELESS value or zero,  
 according to the current setting of the caseless flag. REQ_CASELESS is a bit  
 value > 255. It is added into the firstbyte or reqbyte variables to record the  
 case status of the value. This is used only for ASCII characters. */  
3035    
3036  req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0;  /*************************************************
3037    *     Check if auto-possessifying is possible    *
3038    *************************************************/
3039    
3040  /* Switch on next character until the end of the branch */  /* This function is called for unlimited repeats of certain items, to see
3041    whether the next thing could possibly match the repeated item. If not, it makes
3042    sense to automatically possessify the repeated item.
3043    
3044  for (;; ptr++)  Arguments:
3045    {    previous      pointer to the repeated opcode
3046    BOOL negate_class;    utf           TRUE in UTF-8 / UTF-16 / UTF-32 mode
3047    BOOL possessive_quantifier;    ptr           next character in pattern
3048    BOOL is_quantifier;    options       options bits
3049    int class_charcount;    cd            contains pointers to tables etc.
   int class_lastchar;  
   int newoptions;  
   int recno;  
   int skipbytes;  
   int subreqbyte;  
   int subfirstbyte;  
   int mclength;  
   uschar mcbuffer[8];  
3050    
3051    /* Next byte in the pattern */  Returns:        TRUE if possessifying is wanted
3052    */
3053    
3054    c = *ptr;  static BOOL
3055    check_auto_possessive(const pcre_uchar *previous, BOOL utf,
3056      const pcre_uchar *ptr, int options, compile_data *cd)
3057    {
3058    pcre_uint32 c = NOTACHAR;
3059    pcre_uint32 next;
3060    int escape;
3061    pcre_uchar op_code = *previous++;
3062    
3063    /* If in \Q...\E, check for the end; if not, we have a literal */  /* Skip whitespace and comments in extended mode */
3064    
3065    if (inescq && c != 0)  if ((options & PCRE_EXTENDED) != 0)
3066      {
3067      for (;;)
3068      {      {
3069      if (c == '\\' && ptr[1] == 'E')      while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
3070        if (*ptr == CHAR_NUMBER_SIGN)
3071        {        {
       inescq = FALSE;  
3072        ptr++;        ptr++;
3073        continue;        while (*ptr != 0)
       }  
     else  
       {  
       if (previous_callout != NULL)  
         {  
         complete_callout(previous_callout, ptr, cd);  
         previous_callout = NULL;  
         }  
       if ((options & PCRE_AUTO_CALLOUT) != 0)  
3074          {          {
3075          previous_callout = code;          if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
3076          code = auto_callout(code, ptr, cd);          ptr++;
3077    #ifdef SUPPORT_UTF
3078            if (utf) FORWARDCHAR(ptr);
3079    #endif
3080          }          }
       goto NORMAL_CHAR;  
3081        }        }
3082        else break;
3083      }      }
3084      }
3085    
3086    /* Fill in length of a previous callout, except when the next thing is  /* If the next item is one that we can handle, get its value. A non-negative
3087    a quantifier. */  value is a character, a negative value is an escape value. */
   
   is_quantifier = c == '*' || c == '+' || c == '?' ||  
     (c == '{' && is_counted_repeat(ptr+1));  
3088    
3089    if (!is_quantifier && previous_callout != NULL &&  if (*ptr == CHAR_BACKSLASH)
3090         after_manual_callout-- <= 0)    {
3091      {    int temperrorcode = 0;
3092      complete_callout(previous_callout, ptr, cd);    escape = check_escape(&ptr, &next, &temperrorcode, cd->bracount, options, FALSE);
3093      previous_callout = NULL;    if (temperrorcode != 0) return FALSE;
3094      }    ptr++;    /* Point after the escape sequence */
3095      }
3096    else if (!MAX_255(*ptr) || (cd->ctypes[*ptr] & ctype_meta) == 0)
3097      {
3098      escape = 0;
3099    #ifdef SUPPORT_UTF
3100      if (utf) { GETCHARINC(next, ptr); } else
3101    #endif
3102      next = *ptr++;
3103      }
3104    else return FALSE;
3105    
3106    /* In extended mode, skip white space and comments */  /* Skip whitespace and comments in extended mode */
3107    
3108    if ((options & PCRE_EXTENDED) != 0)  if ((options & PCRE_EXTENDED) != 0)
3109      {
3110      for (;;)
3111      {      {
3112      if ((cd->ctypes[c] & ctype_space) != 0) continue;      while (MAX_255(*ptr) && (cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
3113      if (c == '#')      if (*ptr == CHAR_NUMBER_SIGN)
3114        {        {
3115        /* The space before the ; is to avoid a warning on a silly compiler        ptr++;
3116        on the Macintosh. */        while (*ptr != 0)
3117        while ((c = *(++ptr)) != 0 && c != NEWLINE) ;          {
3118        if (c != 0) continue;   /* Else fall through to handle end of string */          if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
3119            ptr++;
3120    #ifdef SUPPORT_UTF
3121            if (utf) FORWARDCHAR(ptr);
3122    #endif
3123            }
3124        }        }
3125        else break;
3126      }      }
3127      }
3128    
3129    /* No auto callout for quantifiers. */  /* If the next thing is itself optional, we have to give up. */
3130    
3131    if ((options & PCRE_AUTO_CALLOUT) != 0 && !is_quantifier)  if (*ptr == CHAR_ASTERISK || *ptr == CHAR_QUESTION_MARK ||
3132      STRNCMP_UC_C8(ptr, STR_LEFT_CURLY_BRACKET STR_0 STR_COMMA, 3) == 0)
3133        return FALSE;
3134    
3135    /* If the previous item is a character, get its value. */
3136    
3137    if (op_code == OP_CHAR || op_code == OP_CHARI ||
3138        op_code == OP_NOT || op_code == OP_NOTI)
3139      {
3140    #ifdef SUPPORT_UTF
3141      GETCHARTEST(c, previous);
3142    #else
3143      c = *previous;
3144    #endif
3145      }
3146    
3147    /* Now compare the next item with the previous opcode. First, handle cases when
3148    the next item is a character. */
3149    
3150    if (escape == 0)
3151      {
3152      /* For a caseless UTF match, the next character may have more than one other
3153      case, which maps to the special PT_CLIST property. Check this first. */
3154    
3155    #ifdef SUPPORT_UCP
3156      if (utf && c != NOTACHAR && (options & PCRE_CASELESS) != 0)
3157      {      {
3158      previous_callout = code;      unsigned int ocs = UCD_CASESET(next);
3159      code = auto_callout(code, ptr, cd);      if (ocs > 0) return check_char_prop(c, PT_CLIST, ocs, op_code >= OP_NOT);
3160      }      }
3161    #endif
3162    
3163    switch(c)    switch(op_code)
3164      {      {
3165      /* The branch terminates at end of string, |, or ). */      case OP_CHAR:
3166        return c != next;
     case 0:  
     case '|':  
     case ')':  
     *firstbyteptr = firstbyte;  
     *reqbyteptr = reqbyte;  
     *codeptr = code;  
     *ptrptr = ptr;  
     return TRUE;  
   
     /* Handle single-character metacharacters. In multiline mode, ^ disables  
     the setting of any following char as a first character. */  
3167    
3168      case '^':      /* For CHARI (caseless character) we must check the other case. If we have
3169      if ((options & PCRE_MULTILINE) != 0)      Unicode property support, we can use it to test the other case of
3170        high-valued characters. We know that next can have only one other case,
3171        because multi-other-case characters are dealt with above. */
3172    
3173        case OP_CHARI:
3174        if (c == next) return FALSE;
3175    #ifdef SUPPORT_UTF
3176        if (utf)
3177        {        {
3178        if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;        pcre_uint32 othercase;
3179          if (next < 128) othercase = cd->fcc[next]; else
3180    #ifdef SUPPORT_UCP
3181          othercase = UCD_OTHERCASE(next);
3182    #else
3183          othercase = NOTACHAR;
3184    #endif
3185          return c != othercase;
3186        }        }
3187      previous = NULL;      else
3188      *code++ = OP_CIRC;  #endif  /* SUPPORT_UTF */
3189      break;      return (c != TABLE_GET(next, cd->fcc, next));  /* Not UTF */
3190    
3191        case OP_NOT:
3192        return c == next;
3193    
3194        case OP_NOTI:
3195        if (c == next) return TRUE;
3196    #ifdef SUPPORT_UTF
3197        if (utf)
3198          {
3199          pcre_uint32 othercase;
3200          if (next < 128) othercase = cd->fcc[next]; else
3201    #ifdef SUPPORT_UCP
3202          othercase = UCD_OTHERCASE(next);
3203    #else
3204          othercase = NOTACHAR;
3205    #endif
3206          return c == othercase;
3207          }
3208        else
3209    #endif  /* SUPPORT_UTF */
3210        return (c == TABLE_GET(next, cd->fcc, next));  /* Not UTF */
3211    
3212      case '$':      /* Note that OP_DIGIT etc. are generated only when PCRE_UCP is *not* set.
3213      previous = NULL;      When it is set, \d etc. are converted into OP_(NOT_)PROP codes. */
     *code++ = OP_DOLL;  
     break;  
3214    
3215      /* There can never be a first char if '.' is first, whatever happens about      case OP_DIGIT:
3216      repeats. The value of reqbyte doesn't change either. */      return next > 255 || (cd->ctypes[next] & ctype_digit) == 0;
3217    
3218      case '.':      case OP_NOT_DIGIT:
3219      if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;      return next <= 255 && (cd->ctypes[next] & ctype_digit) != 0;
     zerofirstbyte = firstbyte;  
     zeroreqbyte = reqbyte;  
     previous = code;  
     *code++ = OP_ANY;  
     break;  
3220    
3221      /* Character classes. If the included characters are all < 255 in value, we      case OP_WHITESPACE:
3222      build a 32-byte bitmap of the permitted characters, except in the special      return next > 255 || (cd->ctypes[next] & ctype_space) == 0;
     case where there is only one such character. For negated classes, we build  
     the map as usual, then invert it at the end. However, we use a different  
     opcode so that data characters > 255 can be handled correctly.  
3223    
3224      If the class contains characters outside the 0-255 range, a different      case OP_NOT_WHITESPACE:
3225      opcode is compiled. It may optionally have a bit map for characters < 256,      return next <= 255 && (cd->ctypes[next] & ctype_space) != 0;
     but those above are are explicitly listed afterwards. A flag byte tells  
     whether the bitmap is present, and whether this is a negated class or not.  
     */  
3226    
3227      case '[':      case OP_WORDCHAR:
3228      previous = code;      return next > 255 || (cd->ctypes[next] & ctype_word) == 0;
3229    
3230      /* PCRE supports POSIX class stuff inside a class. Perl gives an error if      case OP_NOT_WORDCHAR:
3231      they are encountered at the top level, so we'll do that too. */      return next <= 255 && (cd->ctypes[next] & ctype_word) != 0;
3232    
3233      if ((ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') &&      case OP_HSPACE:
3234          check_posix_syntax(ptr, &tempptr, cd))      case OP_NOT_HSPACE:
3235        switch(next)
3236        {        {
3237        *errorcodeptr = (ptr[1] == ':')? ERR13 : ERR31;        HSPACE_CASES:
3238        goto FAILED;        return op_code == OP_NOT_HSPACE;
       }  
   
     /* If the first character is '^', set the negation flag and skip it. */  
3239    
3240      if ((c = *(++ptr)) == '^')        default:
3241        {        return op_code != OP_NOT_HSPACE;
       negate_class = TRUE;  
       c = *(++ptr);  
3242        }        }
3243      else  
3244        case OP_ANYNL:
3245        case OP_VSPACE:
3246        case OP_NOT_VSPACE:
3247        switch(next)
3248        {        {
3249        negate_class = FALSE;        VSPACE_CASES:
3250        }        return op_code == OP_NOT_VSPACE;
3251    
3252      /* Keep a count of chars with values < 256 so that we can optimize the case        default:
3253      of just a single character (as long as it's < 256). For higher valued UTF-8        return op_code != OP_NOT_VSPACE;
3254      characters, we don't yet do any optimization. */        }
3255    
3256      class_charcount = 0;  #ifdef SUPPORT_UCP
3257      class_lastchar = -1;      case OP_PROP:
3258        return check_char_prop(next, previous[0], previous[1], FALSE);
3259    
3260  #ifdef SUPPORT_UTF8      case OP_NOTPROP:
3261      class_utf8 = FALSE;                       /* No chars >= 256 */      return check_char_prop(next, previous[0], previous[1], TRUE);
     class_utf8data = code + LINK_SIZE + 34;   /* For UTF-8 items */  
3262  #endif  #endif
3263    
3264      /* Initialize the 32-char bit map to all zeros. We have to build the      default:
3265      map in a temporary bit of store, in case the class contains only 1      return FALSE;
3266      character (< 256), because in that case the compiled code doesn't use the      }
3267      bit map. */    }
   
     memset(classbits, 0, 32 * sizeof(uschar));  
   
     /* Process characters until ] is reached. By writing this as a "do" it  
     means that an initial ] is taken as a data character. The first pass  
     through the regex checked the overall syntax, so we don't need to be very  
     strict here. At the start of the loop, c contains the first byte of the  
     character. */  
3268    
3269      do  /* Handle the case when the next item is \d, \s, etc. Note that when PCRE_UCP
3270        {  is set, \d turns into ESC_du rather than ESC_d, etc., so ESC_d etc. are
3271  #ifdef SUPPORT_UTF8  generated only when PCRE_UCP is *not* set, that is, when only ASCII
3272        if (utf8 && c > 127)  characteristics are recognized. Similarly, the opcodes OP_DIGIT etc. are
3273          {                           /* Braces are required because the */  replaced by OP_PROP codes when PCRE_UCP is set. */
         GETCHARLEN(c, ptr, ptr);    /* macro generates multiple statements */  
         }  
 #endif  
3274    
3275        /* Inside \Q...\E everything is literal except \E */  switch(op_code)
3276      {
3277      case OP_CHAR:
3278      case OP_CHARI:
3279      switch(escape)
3280        {
3281        case ESC_d:
3282        return c > 255 || (cd->ctypes[c] & ctype_digit) == 0;
3283    
3284        if (inescq)      case ESC_D:
3285          {      return c <= 255 && (cd->ctypes[c] & ctype_digit) != 0;
         if (c == '\\' && ptr[1] == 'E')  
           {  
           inescq = FALSE;  
           ptr++;  
           continue;  
           }  
         else goto LONE_SINGLE_CHARACTER;  
         }  
3286    
3287        /* Handle POSIX class names. Perl allows a negation extension of the      case ESC_s:
3288        form [:^name:]. A square bracket that doesn't match the syntax is      return c > 255 || (cd->ctypes[c] & ctype_space) == 0;
       treated as a literal. We also recognize the POSIX constructions  
       [.ch.] and [=ch=] ("collating elements") and fault them, as Perl  
       5.6 and 5.8 do. */  
3289    
3290        if (c == '[' &&      case ESC_S:
3291            (ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') &&      return c <= 255 && (cd->ctypes[c] & ctype_space) != 0;
           check_posix_syntax(ptr, &tempptr, cd))  
         {  
         BOOL local_negate = FALSE;  
         int posix_class, i;  
         register const uschar *cbits = cd->cbits;  
3292    
3293          if (ptr[1] != ':')      case ESC_w:
3294            {      return c > 255 || (cd->ctypes[c] & ctype_word) == 0;
           *errorcodeptr = ERR31;  
           goto FAILED;  
           }  
3295    
3296          ptr += 2;      case ESC_W:
3297          if (*ptr == '^')      return c <= 255 && (cd->ctypes[c] & ctype_word) != 0;
           {  
           local_negate = TRUE;  
           ptr++;  
           }  
3298    
3299          posix_class = check_posix_name(ptr, tempptr - ptr);      case ESC_h:
3300          if (posix_class < 0)      case ESC_H:
3301            {      switch(c)
3302            *errorcodeptr = ERR30;        {
3303            goto FAILED;        HSPACE_CASES:
3304            }        return escape != ESC_h;
3305    
3306          default:
3307          return escape == ESC_h;
3308          }
3309    
3310          /* If matching is caseless, upper and lower are converted to      case ESC_v:
3311          alpha. This relies on the fact that the class table starts with      case ESC_V:
3312          alpha, lower, upper as the first 3 entries. */      switch(c)
3313          {
3314          VSPACE_CASES:
3315          return escape != ESC_v;
3316    
3317          if ((options & PCRE_CASELESS) != 0 && posix_class <= 2)        default:
3318            posix_class = 0;        return escape == ESC_v;
3319          }
3320    
3321          /* Or into the map we are building up to 3 of the static class      /* When PCRE_UCP is set, these values get generated for \d etc. Find
3322          tables, or their negations. The [:blank:] class sets up the same      their substitutions and process them. The result will always be either
3323          chars as the [:space:] class (all white space). We remove the vertical      ESC_p or ESC_P. Then fall through to process those values. */
         white space chars afterwards. */  
3324    
3325          posix_class *= 3;  #ifdef SUPPORT_UCP
3326          for (i = 0; i < 3; i++)      case ESC_du:
3327            {      case ESC_DU:
3328            BOOL blankclass = strncmp((char *)ptr, "blank", 5) == 0;      case ESC_wu:
3329            int taboffset = posix_class_maps[posix_class + i];      case ESC_WU:
3330            if (taboffset < 0) break;      case ESC_su:
3331            if (local_negate)      case ESC_SU:
3332              {        {
3333              if (i == 0)        int temperrorcode = 0;
3334                for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+taboffset];        ptr = substitutes[escape - ESC_DU];
3335              else        escape = check_escape(&ptr, &next, &temperrorcode, 0, options, FALSE);
3336                for (c = 0; c < 32; c++) classbits[c] &= ~cbits[c+taboffset];        if (temperrorcode != 0) return FALSE;
3337              if (blankclass) classbits[1] |= 0x3c;        ptr++;    /* For compatibility */
3338              }        }
3339            else      /* Fall through */
             {  
             for (c = 0; c < 32; c++) classbits[c] |= cbits[c+taboffset];  
             if (blankclass) classbits[1] &= ~0x3c;  
             }  
           }  
3340    
3341          ptr = tempptr + 1;      case ESC_p:
3342          class_charcount = 10;  /* Set > 1; assumes more than 1 per class */      case ESC_P:
3343          continue;    /* End of POSIX syntax handling */        {
3344          }        unsigned int ptype = 0, pdata = 0;
3345          int errorcodeptr;
3346          BOOL negated;
3347    
3348        /* Backslash may introduce a single character, or it may introduce one        ptr--;      /* Make ptr point at the p or P */
3349        of the specials, which just set a flag. Escaped items are checked for        if (!get_ucp(&ptr, &negated, &ptype, &pdata, &errorcodeptr))
3350        validity in the pre-compiling pass. The sequence \b is a special case.          return FALSE;
3351        Inside a class (and only there) it is treated as backspace. Elsewhere        ptr++;      /* Point past the final curly ket */
3352        it marks a word boundary. Other escapes have preset maps ready to  
3353        or into the one we are building. We assume they have more than one        /* If the property item is optional, we have to give up. (When generated
3354        character in them, so set class_charcount bigger than one. */        from \d etc by PCRE_UCP, this test will have been applied much earlier,
3355          to the original \d etc. At this point, ptr will point to a zero byte. */
3356        if (c == '\\')  
3357          {        if (*ptr == CHAR_ASTERISK || *ptr == CHAR_QUESTION_MARK ||
3358          c = check_escape(&ptr, errorcodeptr, *brackets, options, TRUE);          STRNCMP_UC_C8(ptr, STR_LEFT_CURLY_BRACKET STR_0 STR_COMMA, 3) == 0)
3359              return FALSE;
         if (-c == ESC_b) c = '\b';       /* \b is backslash in a class */  
         else if (-c == ESC_X) c = 'X';   /* \X is literal X in a class */  
         else if (-c == ESC_Q)            /* Handle start of quoted string */  
           {  
           if (ptr[1] == '\\' && ptr[2] == 'E')  
             {  
             ptr += 2; /* avoid empty string */  
             }  
           else inescq = TRUE;  
           continue;  
           }  
3360    
3361          if (c < 0)        /* Do the property check. */
           {  
           register const uschar *cbits = cd->cbits;  
           class_charcount += 2;     /* Greater than 1 is what matters */  
           switch (-c)  
             {  
             case ESC_d:  
             for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_digit];  
             continue;  
3362    
3363              case ESC_D:        return check_char_prop(c, ptype, pdata, (escape == ESC_P) != negated);
3364              for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_digit];        }
3365              continue;  #endif
3366    
3367              case ESC_w:      default:
3368              for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_word];      return FALSE;
3369              continue;      }
3370    
3371              case ESC_W:    /* In principle, support for Unicode properties should be integrated here as
3372              for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_word];    well. It means re-organizing the above code so as to get hold of the property
3373              continue;    values before switching on the op-code. However, I wonder how many patterns
3374      combine ASCII \d etc with Unicode properties? (Note that if PCRE_UCP is set,
3375      these op-codes are never generated.) */
3376    
3377              case ESC_s:    case OP_DIGIT:
3378              for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_space];    return escape == ESC_D || escape == ESC_s || escape == ESC_W ||
3379              classbits[1] &= ~0x08;   /* Perl 5.004 onwards omits VT from \s */           escape == ESC_h || escape == ESC_v || escape == ESC_R;
             continue;  
3380    
3381              case ESC_S:    case OP_NOT_DIGIT:
3382              for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_space];    return escape == ESC_d;
             classbits[1] |= 0x08;    /* Perl 5.004 onwards omits VT from \s */  
             continue;  
3383    
3384  #ifdef SUPPORT_UCP    case OP_WHITESPACE:
3385              case ESC_p:    return escape == ESC_S || escape == ESC_d || escape == ESC_w;
             case ESC_P:  
               {  
               BOOL negated;  
               int property = get_ucp(&ptr, &negated, errorcodeptr);  
               if (property < 0) goto FAILED;  
               class_utf8 = TRUE;  
               *class_utf8data++ = ((-c == ESC_p) != negated)?  
                 XCL_PROP : XCL_NOTPROP;  
               *class_utf8data++ = property;  
               class_charcount -= 2;   /* Not a < 256 character */  
               }  
             continue;  
 #endif  
3386    
3387              /* Unrecognized escapes are faulted if PCRE is running in its    case OP_NOT_WHITESPACE:
3388              strict mode. By default, for compatibility with Perl, they are    return escape == ESC_s || escape == ESC_h || escape == ESC_v || escape == ESC_R;
             treated as literals. */  
3389    
3390              default:    case OP_HSPACE:
3391              if ((options & PCRE_EXTRA) != 0)    return escape == ESC_S || escape == ESC_H || escape == ESC_d ||
3392                {           escape == ESC_w || escape == ESC_v || escape == ESC_R;
               *errorcodeptr = ERR7;  
               goto FAILED;  
               }  
             c = *ptr;              /* The final character */  
             class_charcount -= 2;  /* Undo the default count from above */  
             }  
           }  
3393    
3394          /* Fall through if we have a single character (c >= 0). This may be    case OP_NOT_HSPACE:
3395          > 256 in UTF-8 mode. */    return escape == ESC_h;
3396    
3397          }   /* End of backslash handling */    /* Can't have \S in here because VT matches \S (Perl anomaly) */
3398      case OP_ANYNL:
3399      case OP_VSPACE:
3400      return escape == ESC_V || escape == ESC_d || escape == ESC_w;
3401    
3402        /* A single character may be followed by '-' to form a range. However,    case OP_NOT_VSPACE:
3403        Perl does not permit ']' to be the end of the range. A '-' character    return escape == ESC_v || escape == ESC_R;
       here is treated as a literal. */  
3404    
3405        if (ptr[1] == '-' && ptr[2] != ']')    case OP_WORDCHAR:
3406          {    return escape == ESC_W || escape == ESC_s || escape == ESC_h ||
3407          int d;           escape == ESC_v || escape == ESC_R;
         ptr += 2;  
3408    
3409  #ifdef SUPPORT_UTF8    case OP_NOT_WORDCHAR:
3410          if (utf8)    return escape == ESC_w || escape == ESC_d;
           {                           /* Braces are required because the */  
           GETCHARLEN(d, ptr, ptr);    /* macro generates multiple statements */  
           }  
         else  
 #endif  
         d = *ptr;  /* Not UTF-8 mode */  
3411    
3412          /* The second part of a range can be a single-character escape, but    default:
3413          not any of the other escapes. Perl 5.6 treats a hyphen as a literal    return FALSE;
3414          in such circumstances. */    }
3415    
3416          if (d == '\\')  /* Control does not reach here */
3417            {  }
           const uschar *oldptr = ptr;  
           d = check_escape(&ptr, errorcodeptr, *brackets, options, TRUE);  
3418    
           /* \b is backslash; \X is literal X; any other special means the '-'  
           was literal */  
3419    
           if (d < 0)  
             {  
             if (d == -ESC_b) d = '\b';  
             else if (d == -ESC_X) d = 'X'; else  
               {  
               ptr = oldptr - 2;  
               goto LONE_SINGLE_CHARACTER;  /* A few lines below */  
               }  
             }  
           }  
3420    
3421          /* The check that the two values are in the correct order happens in  /*************************************************
3422          the pre-pass. Optimize one-character ranges */  *        Add a character or range to a class     *
3423    *************************************************/
3424    
3425          if (d == c) goto LONE_SINGLE_CHARACTER;  /* A few lines below */  /* This function packages up the logic of adding a character or range of
3426    characters to a class. The character values in the arguments will be within the
3427    valid values for the current mode (8-bit, 16-bit, UTF, etc). This function is
3428    mutually recursive with the function immediately below.
3429    
3430          /* In UTF-8 mode, if the upper limit is > 255, or > 127 for caseless  Arguments:
3431          matching, we have to use an XCLASS with extra data items. Caseless    classbits     the bit map for characters < 256
3432          matching for characters > 127 is available only if UCP support is    uchardptr     points to the pointer for extra data
3433          available. */    options       the options word
3434      cd            contains pointers to tables etc.
3435      start         start of range character
3436      end           end of range character
3437    
3438    Returns:        the number of < 256 characters added
3439                    the pointer to extra data is updated
3440    */