/************************************************* * Perl-Compatible Regular Expressions * *************************************************/ /* PCRE is a library of functions to support regular expressions whose syntax and semantics are as close as possible to those of the Perl 5 language. Written by Philip Hazel Copyright (c) 1997-2006 University of Cambridge ----------------------------------------------------------------------------- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of Cambridge nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ----------------------------------------------------------------------------- */ /* This module contains pcre_exec(), the externally visible function that does pattern matching using an NFA algorithm, trying to mimic Perl as closely as possible. There are also some static supporting functions. */ #define NLBLOCK md /* The block containing newline information */ #include "pcre_internal.h" /* Structure for building a chain of data that actually lives on the stack, for holding the values of the subject pointer at the start of each subpattern, so as to detect when an empty string has been matched by a subpattern - to break infinite loops. When NO_RECURSE is set, these blocks are on the heap, not on the stack. */ typedef struct eptrblock { struct eptrblock *epb_prev; USPTR epb_saved_eptr; } eptrblock; /* Flag bits for the match() function */ #define match_condassert 0x01 /* Called to check a condition assertion */ #define match_isgroup 0x02 /* Set if start of bracketed group */ /* Non-error returns from the match() function. Error returns are externally defined PCRE_ERROR_xxx codes, which are all negative. */ #define MATCH_MATCH 1 #define MATCH_NOMATCH 0 /* Maximum number of ints of offset to save on the stack for recursive calls. If the offset vector is bigger, malloc is used. This should be a multiple of 3, because the offset vector is always a multiple of 3 long. */ #define REC_STACK_SAVE_MAX 30 /* Min and max values for the common repeats; for the maxima, 0 => infinity */ static const char rep_min[] = { 0, 0, 1, 1, 0, 0 }; static const char rep_max[] = { 0, 0, 0, 0, 1, 1 }; #ifdef PCRE_DEBUG /************************************************* * Debugging function to print chars * *************************************************/ /* Print a sequence of chars in printable format, stopping at the end of the subject if the requested. Arguments: p points to characters length number to print is_subject TRUE if printing from within md->start_subject md pointer to matching data block, if is_subject is TRUE Returns: nothing */ static void pchars(const uschar *p, int length, BOOL is_subject, match_data *md) { int c; if (is_subject && length > md->end_subject - p) length = md->end_subject - p; while (length-- > 0) if (isprint(c = *(p++))) printf("%c", c); else printf("\\x%02x", c); } #endif /************************************************* * Match a back-reference * *************************************************/ /* If a back reference hasn't been set, the length that is passed is greater than the number of characters left in the string, so the match fails. Arguments: offset index into the offset vector eptr points into the subject length length to be matched md points to match data block ims the ims flags Returns: TRUE if matched */ static BOOL match_ref(int offset, register USPTR eptr, int length, match_data *md, unsigned long int ims) { USPTR p = md->start_subject + md->offset_vector[offset]; #ifdef PCRE_DEBUG if (eptr >= md->end_subject) printf("matching subject "); else { printf("matching subject "); pchars(eptr, length, TRUE, md); } printf(" against backref "); pchars(p, length, FALSE, md); printf("\n"); #endif /* Always fail if not enough characters left */ if (length > md->end_subject - eptr) return FALSE; /* Separate the caselesss case for speed */ if ((ims & PCRE_CASELESS) != 0) { while (length-- > 0) if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE; } else { while (length-- > 0) if (*p++ != *eptr++) return FALSE; } return TRUE; } /*************************************************************************** **************************************************************************** RECURSION IN THE match() FUNCTION The match() function is highly recursive, though not every recursive call increases the recursive depth. Nevertheless, some regular expressions can cause it to recurse to a great depth. I was writing for Unix, so I just let it call itself recursively. This uses the stack for saving everything that has to be saved for a recursive call. On Unix, the stack can be large, and this works fine. It turns out that on some non-Unix-like systems there are problems with programs that use a lot of stack. (This despite the fact that every last chip has oodles of memory these days, and techniques for extending the stack have been known for decades.) So.... There is a fudge, triggered by defining NO_RECURSE, which avoids recursive calls by keeping local variables that need to be preserved in blocks of memory obtained from malloc() instead instead of on the stack. Macros are used to achieve this so that the actual code doesn't look very different to what it always used to. **************************************************************************** ***************************************************************************/ /* These versions of the macros use the stack, as normal. There are debugging versions and production versions. */ #ifndef NO_RECURSE #define REGISTER register #ifdef PCRE_DEBUG #define RMATCH(rx,ra,rb,rc,rd,re,rf,rg) \ { \ printf("match() called in line %d\n", __LINE__); \ rx = match(ra,rb,rc,rd,re,rf,rg,rdepth+1); \ printf("to line %d\n", __LINE__); \ } #define RRETURN(ra) \ { \ printf("match() returned %d from line %d ", ra, __LINE__); \ return ra; \ } #else #define RMATCH(rx,ra,rb,rc,rd,re,rf,rg) \ rx = match(ra,rb,rc,rd,re,rf,rg,rdepth+1) #define RRETURN(ra) return ra #endif #else /* These versions of the macros manage a private stack on the heap. Note that the rd argument of RMATCH isn't actually used. It's the md argument of match(), which never changes. */ #define REGISTER #define RMATCH(rx,ra,rb,rc,rd,re,rf,rg)\ {\ heapframe *newframe = (pcre_stack_malloc)(sizeof(heapframe));\ if (setjmp(frame->Xwhere) == 0)\ {\ newframe->Xeptr = ra;\ newframe->Xecode = rb;\ newframe->Xoffset_top = rc;\ newframe->Xims = re;\ newframe->Xeptrb = rf;\ newframe->Xflags = rg;\ newframe->Xrdepth = frame->Xrdepth + 1;\ newframe->Xprevframe = frame;\ frame = newframe;\ DPRINTF(("restarting from line %d\n", __LINE__));\ goto HEAP_RECURSE;\ }\ else\ {\ DPRINTF(("longjumped back to line %d\n", __LINE__));\ frame = md->thisframe;\ rx = frame->Xresult;\ }\ } #define RRETURN(ra)\ {\ heapframe *newframe = frame;\ frame = newframe->Xprevframe;\ (pcre_stack_free)(newframe);\ if (frame != NULL)\ {\ frame->Xresult = ra;\ md->thisframe = frame;\ longjmp(frame->Xwhere, 1);\ }\ return ra;\ } /* Structure for remembering the local variables in a private frame */ typedef struct heapframe { struct heapframe *Xprevframe; /* Function arguments that may change */ const uschar *Xeptr; const uschar *Xecode; int Xoffset_top; long int Xims; eptrblock *Xeptrb; int Xflags; unsigned int Xrdepth; /* Function local variables */ const uschar *Xcallpat; const uschar *Xcharptr; const uschar *Xdata; const uschar *Xnext; const uschar *Xpp; const uschar *Xprev; const uschar *Xsaved_eptr; recursion_info Xnew_recursive; BOOL Xcur_is_word; BOOL Xcondition; BOOL Xminimize; BOOL Xprev_is_word; unsigned long int Xoriginal_ims; #ifdef SUPPORT_UCP int Xprop_type; int Xprop_value; int Xprop_fail_result; int Xprop_category; int Xprop_chartype; int Xprop_script; int *Xprop_test_variable; #endif int Xctype; int Xfc; int Xfi; int Xlength; int Xmax; int Xmin; int Xnumber; int Xoffset; int Xop; int Xsave_capture_last; int Xsave_offset1, Xsave_offset2, Xsave_offset3; int Xstacksave[REC_STACK_SAVE_MAX]; eptrblock Xnewptrb; /* Place to pass back result, and where to jump back to */ int Xresult; jmp_buf Xwhere; } heapframe; #endif /*************************************************************************** ***************************************************************************/ /************************************************* * Match from current position * *************************************************/ /* On entry ecode points to the first opcode, and eptr to the first character in the subject string, while eptrb holds the value of eptr at the start of the last bracketed group - used for breaking infinite loops matching zero-length strings. This function is called recursively in many circumstances. Whenever it returns a negative (error) response, the outer incarnation must also return the same response. Performance note: It might be tempting to extract commonly used fields from the md structure (e.g. utf8, end_subject) into individual variables to improve performance. Tests using gcc on a SPARC disproved this; in the first case, it made performance worse. Arguments: eptr pointer in subject ecode position in code offset_top current top pointer md pointer to "static" info for the match ims current /i, /m, and /s options eptrb pointer to chain of blocks containing eptr at start of brackets - for testing for empty matches flags can contain match_condassert - this is an assertion condition match_isgroup - this is the start of a bracketed group rdepth the recursion depth Returns: MATCH_MATCH if matched ) these values are >= 0 MATCH_NOMATCH if failed to match ) a negative PCRE_ERROR_xxx value if aborted by an error condition (e.g. stopped by repeated call or recursion limit) */ static int match(REGISTER USPTR eptr, REGISTER const uschar *ecode, int offset_top, match_data *md, unsigned long int ims, eptrblock *eptrb, int flags, unsigned int rdepth) { /* These variables do not need to be preserved over recursion in this function, so they can be ordinary variables in all cases. Mark them with "register" because they are used a lot in loops. */ register int rrc; /* Returns from recursive calls */ register int i; /* Used for loops not involving calls to RMATCH() */ register unsigned int c; /* Character values not kept over RMATCH() calls */ register BOOL utf8; /* Local copy of UTF-8 flag for speed */ /* When recursion is not being used, all "local" variables that have to be preserved over calls to RMATCH() are part of a "frame" which is obtained from heap storage. Set up the top-level frame here; others are obtained from the heap whenever RMATCH() does a "recursion". See the macro definitions above. */ #ifdef NO_RECURSE heapframe *frame = (pcre_stack_malloc)(sizeof(heapframe)); frame->Xprevframe = NULL; /* Marks the top level */ /* Copy in the original argument variables */ frame->Xeptr = eptr; frame->Xecode = ecode; frame->Xoffset_top = offset_top; frame->Xims = ims; frame->Xeptrb = eptrb; frame->Xflags = flags; frame->Xrdepth = rdepth; /* This is where control jumps back to to effect "recursion" */ HEAP_RECURSE: /* Macros make the argument variables come from the current frame */ #define eptr frame->Xeptr #define ecode frame->Xecode #define offset_top frame->Xoffset_top #define ims frame->Xims #define eptrb frame->Xeptrb #define flags frame->Xflags #define rdepth frame->Xrdepth /* Ditto for the local variables */ #ifdef SUPPORT_UTF8 #define charptr frame->Xcharptr #endif #define callpat frame->Xcallpat #define data frame->Xdata #define next frame->Xnext #define pp frame->Xpp #define prev frame->Xprev #define saved_eptr frame->Xsaved_eptr #define new_recursive frame->Xnew_recursive #define cur_is_word frame->Xcur_is_word #define condition frame->Xcondition #define minimize frame->Xminimize #define prev_is_word frame->Xprev_is_word #define original_ims frame->Xoriginal_ims #ifdef SUPPORT_UCP #define prop_type frame->Xprop_type #define prop_value frame->Xprop_value #define prop_fail_result frame->Xprop_fail_result #define prop_category frame->Xprop_category #define prop_chartype frame->Xprop_chartype #define prop_script frame->Xprop_script #define prop_test_variable frame->Xprop_test_variable #endif #define ctype frame->Xctype #define fc frame->Xfc #define fi frame->Xfi #define length frame->Xlength #define max frame->Xmax #define min frame->Xmin #define number frame->Xnumber #define offset frame->Xoffset #define op frame->Xop #define save_capture_last frame->Xsave_capture_last #define save_offset1 frame->Xsave_offset1 #define save_offset2 frame->Xsave_offset2 #define save_offset3 frame->Xsave_offset3 #define stacksave frame->Xstacksave #define newptrb frame->Xnewptrb /* When recursion is being used, local variables are allocated on the stack and get preserved during recursion in the normal way. In this environment, fi and i, and fc and c, can be the same variables. */ #else #define fi i #define fc c #ifdef SUPPORT_UTF8 /* Many of these variables are used only */ const uschar *charptr; /* in small blocks of the code. My normal */ #endif /* style of coding would have declared */ const uschar *callpat; /* them within each of those blocks. */ const uschar *data; /* However, in order to accommodate the */ const uschar *next; /* version of this code that uses an */ USPTR pp; /* external "stack" implemented on the */ const uschar *prev; /* heap, it is easier to declare them all */ USPTR saved_eptr; /* here, so the declarations can be cut */ /* out in a block. The only declarations */ recursion_info new_recursive; /* within blocks below are for variables */ /* that do not have to be preserved over */ BOOL cur_is_word; /* a recursive call to RMATCH(). */ BOOL condition; BOOL minimize; BOOL prev_is_word; unsigned long int original_ims; #ifdef SUPPORT_UCP int prop_type; int prop_value; int prop_fail_result; int prop_category; int prop_chartype; int prop_script; int *prop_test_variable; #endif int ctype; int length; int max; int min; int number; int offset; int op; int save_capture_last; int save_offset1, save_offset2, save_offset3; int stacksave[REC_STACK_SAVE_MAX]; eptrblock newptrb; #endif /* These statements are here to stop the compiler complaining about unitialized variables. */ #ifdef SUPPORT_UCP prop_value = 0; prop_fail_result = 0; prop_test_variable = NULL; #endif /* This label is used for tail recursion, which is used in a few cases even when NO_RECURSE is not defined, in order to reduce the amount of stack that is used. Thanks to Ian Taylor for noticing this possibility and sending the original patch. */ TAIL_RECURSE: /* OK, now we can get on with the real code of the function. Recursive calls are specified by the macro RMATCH and RRETURN is used to return. When NO_RECURSE is *not* defined, these just turn into a recursive call to match() and a "return", respectively (possibly with some debugging if PCRE_DEBUG is defined). However, RMATCH isn't like a function call because it's quite a complicated macro. It has to be used in one particular way. This shouldn't, however, impact performance when true recursion is being used. */ /* First check that we haven't called match() too many times, or that we haven't exceeded the recursive call limit. */ if (md->match_call_count++ >= md->match_limit) RRETURN(PCRE_ERROR_MATCHLIMIT); if (rdepth >= md->match_limit_recursion) RRETURN(PCRE_ERROR_RECURSIONLIMIT); original_ims = ims; /* Save for resetting on ')' */ #ifdef SUPPORT_UTF8 utf8 = md->utf8; /* Local copy of the flag */ #else utf8 = FALSE; #endif /* At the start of a bracketed group, add the current subject pointer to the stack of such pointers, to be re-instated at the end of the group when we hit the closing ket. When match() is called in other circumstances, we don't add to this stack. */ if ((flags & match_isgroup) != 0) { newptrb.epb_prev = eptrb; newptrb.epb_saved_eptr = eptr; eptrb = &newptrb; } /* Now start processing the operations. */ for (;;) { op = *ecode; minimize = FALSE; /* For partial matching, remember if we ever hit the end of the subject after matching at least one subject character. */ if (md->partial && eptr >= md->end_subject && eptr > md->start_match) md->hitend = TRUE; /* Opening capturing bracket. If there is space in the offset vector, save the current subject position in the working slot at the top of the vector. We mustn't change the current values of the data slot, because they may be set from a previous iteration of this group, and be referred to by a reference inside the group. If the bracket fails to match, we need to restore this value and also the values of the final offsets, in case they were set by a previous iteration of the same bracket. If there isn't enough space in the offset vector, treat this as if it were a non-capturing bracket. Don't worry about setting the flag for the error case here; that is handled in the code for KET. */ if (op > OP_BRA) { number = op - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (number > EXTRACT_BASIC_MAX) number = GET2(ecode, 2+LINK_SIZE); offset = number << 1; #ifdef PCRE_DEBUG printf("start bracket %d subject=", number); pchars(eptr, 16, TRUE, md); printf("\n"); #endif if (offset < md->offset_max) { save_offset1 = md->offset_vector[offset]; save_offset2 = md->offset_vector[offset+1]; save_offset3 = md->offset_vector[md->offset_end - number]; save_capture_last = md->capture_last; DPRINTF(("saving %d %d %d\n", save_offset1, save_offset2, save_offset3)); md->offset_vector[md->offset_end - number] = eptr - md->start_subject; do { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); md->capture_last = save_capture_last; ecode += GET(ecode, 1); } while (*ecode == OP_ALT); DPRINTF(("bracket %d failed\n", number)); md->offset_vector[offset] = save_offset1; md->offset_vector[offset+1] = save_offset2; md->offset_vector[md->offset_end - number] = save_offset3; RRETURN(MATCH_NOMATCH); } /* Insufficient room for saving captured contents */ else op = OP_BRA; } /* Other types of node can be handled by a switch */ switch(op) { case OP_BRA: /* Non-capturing bracket: optimized */ DPRINTF(("start bracket 0\n")); /* Loop for all the alternatives */ for (;;) { /* When we get to the final alternative within the brackets, we would return the result of a recursive call to match() whatever happened. We can reduce stack usage by turning this into a tail recursion. */ if (ecode[GET(ecode, 1)] != OP_ALT) { ecode += 1 + LINK_SIZE; flags = match_isgroup; DPRINTF(("bracket 0 tail recursion\n")); goto TAIL_RECURSE; } /* For non-final alternatives, continue the loop for a NOMATCH result; otherwise return. */ RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += GET(ecode, 1); } /* Control never reaches here. */ /* Conditional group: compilation checked that there are no more than two branches. If the condition is false, skipping the first branch takes us past the end if there is only one branch, but that's OK because that is exactly what going to the ket would do. As there is only one branch to be obeyed, we can use tail recursion to avoid using another stack frame. */ case OP_COND: if (ecode[LINK_SIZE+1] == OP_CREF) /* Condition extract or recurse test */ { offset = GET2(ecode, LINK_SIZE+2) << 1; /* Doubled ref number */ condition = (offset == CREF_RECURSE * 2)? (md->recursive != NULL) : (offset < offset_top && md->offset_vector[offset] >= 0); ecode += condition? (LINK_SIZE + 4) : (LINK_SIZE + 1 + GET(ecode, 1)); flags = match_isgroup; goto TAIL_RECURSE; } /* The condition is an assertion. Call match() to evaluate it - setting the final argument TRUE causes it to stop at the end of an assertion. */ else { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_condassert | match_isgroup); if (rrc == MATCH_MATCH) { ecode += 1 + LINK_SIZE + GET(ecode, LINK_SIZE+2); while (*ecode == OP_ALT) ecode += GET(ecode, 1); } else if (rrc != MATCH_NOMATCH) { RRETURN(rrc); /* Need braces because of following else */ } else ecode += GET(ecode, 1); /* We are now at the branch that is to be obeyed. As there is only one, we can use tail recursion to avoid using another stack frame. */ ecode += 1 + LINK_SIZE; flags = match_isgroup; goto TAIL_RECURSE; } /* Control never reaches here */ /* Skip over conditional reference or large extraction number data if encountered. */ case OP_CREF: case OP_BRANUMBER: ecode += 3; break; /* End of the pattern. If we are in a recursion, we should restore the offsets appropriately and continue from after the call. */ case OP_END: if (md->recursive != NULL && md->recursive->group_num == 0) { recursion_info *rec = md->recursive; DPRINTF(("End of pattern in a (?0) recursion\n")); md->recursive = rec->prevrec; memmove(md->offset_vector, rec->offset_save, rec->saved_max * sizeof(int)); md->start_match = rec->save_start; ims = original_ims; ecode = rec->after_call; break; } /* Otherwise, if PCRE_NOTEMPTY is set, fail if we have matched an empty string - backtracking will then try other alternatives, if any. */ if (md->notempty && eptr == md->start_match) RRETURN(MATCH_NOMATCH); md->end_match_ptr = eptr; /* Record where we ended */ md->end_offset_top = offset_top; /* and how many extracts were taken */ RRETURN(MATCH_MATCH); /* Change option settings */ case OP_OPT: ims = ecode[1]; ecode += 2; DPRINTF(("ims set to %02lx\n", ims)); break; /* Assertion brackets. Check the alternative branches in turn - the matching won't pass the KET for an assertion. If any one branch matches, the assertion is true. Lookbehind assertions have an OP_REVERSE item at the start of each branch to move the current point backwards, so the code at this level is identical to the lookahead case. */ case OP_ASSERT: case OP_ASSERTBACK: do { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_isgroup); if (rrc == MATCH_MATCH) break; if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += GET(ecode, 1); } while (*ecode == OP_ALT); if (*ecode == OP_KET) RRETURN(MATCH_NOMATCH); /* If checking an assertion for a condition, return MATCH_MATCH. */ if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH); /* Continue from after the assertion, updating the offsets high water mark, since extracts may have been taken during the assertion. */ do ecode += GET(ecode,1); while (*ecode == OP_ALT); ecode += 1 + LINK_SIZE; offset_top = md->end_offset_top; continue; /* Negative assertion: all branches must fail to match */ case OP_ASSERT_NOT: case OP_ASSERTBACK_NOT: do { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, NULL, match_isgroup); if (rrc == MATCH_MATCH) RRETURN(MATCH_NOMATCH); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += GET(ecode,1); } while (*ecode == OP_ALT); if ((flags & match_condassert) != 0) RRETURN(MATCH_MATCH); ecode += 1 + LINK_SIZE; continue; /* Move the subject pointer back. This occurs only at the start of each branch of a lookbehind assertion. If we are too close to the start to move back, this match function fails. When working with UTF-8 we move back a number of characters, not bytes. */ case OP_REVERSE: #ifdef SUPPORT_UTF8 if (utf8) { c = GET(ecode,1); for (i = 0; i < c; i++) { eptr--; if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH); BACKCHAR(eptr) } } else #endif /* No UTF-8 support, or not in UTF-8 mode: count is byte count */ { eptr -= GET(ecode,1); if (eptr < md->start_subject) RRETURN(MATCH_NOMATCH); } /* Skip to next op code */ ecode += 1 + LINK_SIZE; break; /* The callout item calls an external function, if one is provided, passing details of the match so far. This is mainly for debugging, though the function is able to force a failure. */ case OP_CALLOUT: if (pcre_callout != NULL) { pcre_callout_block cb; cb.version = 1; /* Version 1 of the callout block */ cb.callout_number = ecode[1]; cb.offset_vector = md->offset_vector; cb.subject = (PCRE_SPTR)md->start_subject; cb.subject_length = md->end_subject - md->start_subject; cb.start_match = md->start_match - md->start_subject; cb.current_position = eptr - md->start_subject; cb.pattern_position = GET(ecode, 2); cb.next_item_length = GET(ecode, 2 + LINK_SIZE); cb.capture_top = offset_top/2; cb.capture_last = md->capture_last; cb.callout_data = md->callout_data; if ((rrc = (*pcre_callout)(&cb)) > 0) RRETURN(MATCH_NOMATCH); if (rrc < 0) RRETURN(rrc); } ecode += 2 + 2*LINK_SIZE; break; /* Recursion either matches the current regex, or some subexpression. The offset data is the offset to the starting bracket from the start of the whole pattern. (This is so that it works from duplicated subpatterns.) If there are any capturing brackets started but not finished, we have to save their starting points and reinstate them after the recursion. However, we don't know how many such there are (offset_top records the completed total) so we just have to save all the potential data. There may be up to 65535 such values, which is too large to put on the stack, but using malloc for small numbers seems expensive. As a compromise, the stack is used when there are no more than REC_STACK_SAVE_MAX values to store; otherwise malloc is used. A problem is what to do if the malloc fails ... there is no way of returning to the top level with an error. Save the top REC_STACK_SAVE_MAX values on the stack, and accept that the rest may be wrong. There are also other values that have to be saved. We use a chained sequence of blocks that actually live on the stack. Thanks to Robin Houston for the original version of this logic. */ case OP_RECURSE: { callpat = md->start_code + GET(ecode, 1); new_recursive.group_num = *callpat - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (new_recursive.group_num > EXTRACT_BASIC_MAX) new_recursive.group_num = GET2(callpat, 2+LINK_SIZE); /* Add to "recursing stack" */ new_recursive.prevrec = md->recursive; md->recursive = &new_recursive; /* Find where to continue from afterwards */ ecode += 1 + LINK_SIZE; new_recursive.after_call = ecode; /* Now save the offset data. */ new_recursive.saved_max = md->offset_end; if (new_recursive.saved_max <= REC_STACK_SAVE_MAX) new_recursive.offset_save = stacksave; else { new_recursive.offset_save = (int *)(pcre_malloc)(new_recursive.saved_max * sizeof(int)); if (new_recursive.offset_save == NULL) RRETURN(PCRE_ERROR_NOMEMORY); } memcpy(new_recursive.offset_save, md->offset_vector, new_recursive.saved_max * sizeof(int)); new_recursive.save_start = md->start_match; md->start_match = eptr; /* OK, now we can do the recursion. For each top-level alternative we restore the offset and recursion data. */ DPRINTF(("Recursing into group %d\n", new_recursive.group_num)); do { RMATCH(rrc, eptr, callpat + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); if (rrc == MATCH_MATCH) { DPRINTF(("Recursion matched\n")); md->recursive = new_recursive.prevrec; if (new_recursive.offset_save != stacksave) (pcre_free)(new_recursive.offset_save); RRETURN(MATCH_MATCH); } else if (rrc != MATCH_NOMATCH) { DPRINTF(("Recursion gave error %d\n", rrc)); RRETURN(rrc); } md->recursive = &new_recursive; memcpy(md->offset_vector, new_recursive.offset_save, new_recursive.saved_max * sizeof(int)); callpat += GET(callpat, 1); } while (*callpat == OP_ALT); DPRINTF(("Recursion didn't match\n")); md->recursive = new_recursive.prevrec; if (new_recursive.offset_save != stacksave) (pcre_free)(new_recursive.offset_save); RRETURN(MATCH_NOMATCH); } /* Control never reaches here */ /* "Once" brackets are like assertion brackets except that after a match, the point in the subject string is not moved back. Thus there can never be a move back into the brackets. Friedl calls these "atomic" subpatterns. Check the alternative branches in turn - the matching won't pass the KET for this kind of subpattern. If any one branch matches, we carry on as at the end of a normal bracket, leaving the subject pointer. */ case OP_ONCE: prev = ecode; saved_eptr = eptr; do { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); if (rrc == MATCH_MATCH) break; if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += GET(ecode,1); } while (*ecode == OP_ALT); /* If hit the end of the group (which could be repeated), fail */ if (*ecode != OP_ONCE && *ecode != OP_ALT) RRETURN(MATCH_NOMATCH); /* Continue as from after the assertion, updating the offsets high water mark, since extracts may have been taken. */ do ecode += GET(ecode,1); while (*ecode == OP_ALT); offset_top = md->end_offset_top; eptr = md->end_match_ptr; /* For a non-repeating ket, just continue at this level. This also happens for a repeating ket if no characters were matched in the group. This is the forcible breaking of infinite loops as implemented in Perl 5.005. If there is an options reset, it will get obeyed in the normal course of events. */ if (*ecode == OP_KET || eptr == saved_eptr) { ecode += 1+LINK_SIZE; break; } /* The repeating kets try the rest of the pattern or restart from the preceding bracket, in the appropriate order. The second "call" of match() uses tail recursion, to avoid using another stack frame. We need to reset any options that changed within the bracket before re-running it, so check the next opcode. */ if (ecode[1+LINK_SIZE] == OP_OPT) { ims = (ims & ~PCRE_IMS) | ecode[4]; DPRINTF(("ims set to %02lx at group repeat\n", ims)); } if (*ecode == OP_KETRMIN) { RMATCH(rrc, eptr, ecode + 1 + LINK_SIZE, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode = prev; flags = match_isgroup; goto TAIL_RECURSE; } else /* OP_KETRMAX */ { RMATCH(rrc, eptr, prev, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += 1 + LINK_SIZE; flags = 0; goto TAIL_RECURSE; } /* Control never gets here */ /* An alternation is the end of a branch; scan along to find the end of the bracketed group and go to there. */ case OP_ALT: do ecode += GET(ecode,1); while (*ecode == OP_ALT); break; /* BRAZERO and BRAMINZERO occur just before a bracket group, indicating that it may occur zero times. It may repeat infinitely, or not at all - i.e. it could be ()* or ()? in the pattern. Brackets with fixed upper repeat limits are compiled as a number of copies, with the optional ones preceded by BRAZERO or BRAMINZERO. */ case OP_BRAZERO: { next = ecode+1; RMATCH(rrc, eptr, next, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); do next += GET(next,1); while (*next == OP_ALT); ecode = next + 1+LINK_SIZE; } break; case OP_BRAMINZERO: { next = ecode+1; do next += GET(next,1); while (*next == OP_ALT); RMATCH(rrc, eptr, next + 1+LINK_SIZE, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode++; } break; /* End of a group, repeated or non-repeating. If we are at the end of an assertion "group", stop matching and return MATCH_MATCH, but record the current high water mark for use by positive assertions. Do this also for the "once" (not-backup up) groups. */ case OP_KET: case OP_KETRMIN: case OP_KETRMAX: prev = ecode - GET(ecode, 1); saved_eptr = eptrb->epb_saved_eptr; /* Back up the stack of bracket start pointers. */ eptrb = eptrb->epb_prev; if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT || *prev == OP_ASSERTBACK || *prev == OP_ASSERTBACK_NOT || *prev == OP_ONCE) { md->end_match_ptr = eptr; /* For ONCE */ md->end_offset_top = offset_top; RRETURN(MATCH_MATCH); } /* In all other cases except a conditional group we have to check the group number back at the start and if necessary complete handling an extraction by setting the offsets and bumping the high water mark. */ if (*prev != OP_COND) { number = *prev - OP_BRA; /* For extended extraction brackets (large number), we have to fish out the number from a dummy opcode at the start. */ if (number > EXTRACT_BASIC_MAX) number = GET2(prev, 2+LINK_SIZE); offset = number << 1; #ifdef PCRE_DEBUG printf("end bracket %d", number); printf("\n"); #endif /* Test for a numbered group. This includes groups called as a result of recursion. Note that whole-pattern recursion is coded as a recurse into group 0, so it won't be picked up here. Instead, we catch it when the OP_END is reached. */ if (number > 0) { md->capture_last = number; if (offset >= md->offset_max) md->offset_overflow = TRUE; else { md->offset_vector[offset] = md->offset_vector[md->offset_end - number]; md->offset_vector[offset+1] = eptr - md->start_subject; if (offset_top <= offset) offset_top = offset + 2; } /* Handle a recursively called group. Restore the offsets appropriately and continue from after the call. */ if (md->recursive != NULL && md->recursive->group_num == number) { recursion_info *rec = md->recursive; DPRINTF(("Recursion (%d) succeeded - continuing\n", number)); md->recursive = rec->prevrec; md->start_match = rec->save_start; memcpy(md->offset_vector, rec->offset_save, rec->saved_max * sizeof(int)); ecode = rec->after_call; ims = original_ims; break; } } } /* Reset the value of the ims flags, in case they got changed during the group. */ ims = original_ims; DPRINTF(("ims reset to %02lx\n", ims)); /* For a non-repeating ket, just continue at this level. This also happens for a repeating ket if no characters were matched in the group. This is the forcible breaking of infinite loops as implemented in Perl 5.005. If there is an options reset, it will get obeyed in the normal course of events. */ if (*ecode == OP_KET || eptr == saved_eptr) { ecode += 1 + LINK_SIZE; break; } /* The repeating kets try the rest of the pattern or restart from the preceding bracket, in the appropriate order. In the second case, we can use tail recursion to avoid using another stack frame. */ if (*ecode == OP_KETRMIN) { RMATCH(rrc, eptr, ecode + 1+LINK_SIZE, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode = prev; flags = match_isgroup; goto TAIL_RECURSE; } else /* OP_KETRMAX */ { RMATCH(rrc, eptr, prev, offset_top, md, ims, eptrb, match_isgroup); if (rrc != MATCH_NOMATCH) RRETURN(rrc); ecode += 1 + LINK_SIZE; flags = 0; goto TAIL_RECURSE; } /* Control never gets here */ /* Start of subject unless notbol, or after internal newline if multiline */ case OP_CIRC: if (md->notbol && eptr == md->start_subject) RRETURN(MATCH_NOMATCH); if ((ims & PCRE_MULTILINE) != 0) { if (eptr != md->start_subject && (eptr == md->end_subject || eptr < md->start_subject + md->nllen || !IS_NEWLINE(eptr - md->nllen))) RRETURN(MATCH_NOMATCH); ecode++; break; } /* ... else fall through */ /* Start of subject assertion */ case OP_SOD: if (eptr != md->start_subject) RRETURN(MATCH_NOMATCH); ecode++; break; /* Start of match assertion */ case OP_SOM: if (eptr != md->start_subject + md->start_offset) RRETURN(MATCH_NOMATCH); ecode++; break; /* Assert before internal newline if multiline, or before a terminating newline unless endonly is set, else end of subject unless noteol is set. */ case OP_DOLL: if ((ims & PCRE_MULTILINE) != 0) { if (eptr < md->end_subject) { if (!IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH); } else { if (md->noteol) RRETURN(MATCH_NOMATCH); } ecode++; break; } else { if (md->noteol) RRETURN(MATCH_NOMATCH); if (!md->endonly) { if (eptr != md->end_subject && (eptr != md->end_subject - md->nllen || !IS_NEWLINE(eptr))) RRETURN(MATCH_NOMATCH); ecode++; break; } } /* ... else fall through for endonly */ /* End of subject assertion (\z) */ case OP_EOD: if (eptr < md->end_subject) RRETURN(MATCH_NOMATCH); ecode++; break; /* End of subject or ending \n assertion (\Z) */ case OP_EODN: if (eptr != md->end_subject && (eptr != md->end_subject - md->nllen || !IS_NEWLINE(eptr))) RRETURN(MATCH_NOMATCH); ecode++; break; /* Word boundary assertions */ case OP_NOT_WORD_BOUNDARY: case OP_WORD_BOUNDARY: { /* Find out if the previous and current characters are "word" characters. It takes a bit more work in UTF-8 mode. Characters > 255 are assumed to be "non-word" characters. */ #ifdef SUPPORT_UTF8 if (utf8) { if (eptr == md->start_subject) prev_is_word = FALSE; else { const uschar *lastptr = eptr - 1; while((*lastptr & 0xc0) == 0x80) lastptr--; GETCHAR(c, lastptr); prev_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0; } if (eptr >= md->end_subject) cur_is_word = FALSE; else { GETCHAR(c, eptr); cur_is_word = c < 256 && (md->ctypes[c] & ctype_word) != 0; } } else #endif /* More streamlined when not in UTF-8 mode */ { prev_is_word = (eptr != md->start_subject) && ((md->ctypes[eptr[-1]] & ctype_word) != 0); cur_is_word = (eptr < md->end_subject) && ((md->ctypes[*eptr] & ctype_word) != 0); } /* Now see if the situation is what we want */ if ((*ecode++ == OP_WORD_BOUNDARY)? cur_is_word == prev_is_word : cur_is_word != prev_is_word) RRETURN(MATCH_NOMATCH); } break; /* Match a single character type; inline for speed */ case OP_ANY: if ((ims & PCRE_DOTALL) == 0) { if (eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH); } if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH); if (utf8) while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; ecode++; break; /* Match a single byte, even in UTF-8 mode. This opcode really does match any byte, even newline, independent of the setting of PCRE_DOTALL. */ case OP_ANYBYTE: if (eptr++ >= md->end_subject) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_NOT_DIGIT: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_digit) != 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_DIGIT: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_digit) == 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_NOT_WHITESPACE: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_space) != 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_WHITESPACE: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_space) == 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_NOT_WORDCHAR: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c < 256 && #endif (md->ctypes[c] & ctype_word) != 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; case OP_WORDCHAR: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); if ( #ifdef SUPPORT_UTF8 c >= 256 || #endif (md->ctypes[c] & ctype_word) == 0 ) RRETURN(MATCH_NOMATCH); ecode++; break; #ifdef SUPPORT_UCP /* Check the next character by Unicode property. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ case OP_PROP: case OP_NOTPROP: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); { int chartype, script; int category = _pcre_ucp_findprop(c, &chartype, &script); switch(ecode[1]) { case PT_ANY: if (op == OP_NOTPROP) RRETURN(MATCH_NOMATCH); break; case PT_LAMP: if ((chartype == ucp_Lu || chartype == ucp_Ll || chartype == ucp_Lt) == (op == OP_NOTPROP)) RRETURN(MATCH_NOMATCH); break; case PT_GC: if ((ecode[2] != category) == (op == OP_PROP)) RRETURN(MATCH_NOMATCH); break; case PT_PC: if ((ecode[2] != chartype) == (op == OP_PROP)) RRETURN(MATCH_NOMATCH); break; case PT_SC: if ((ecode[2] != script) == (op == OP_PROP)) RRETURN(MATCH_NOMATCH); break; default: RRETURN(PCRE_ERROR_INTERNAL); break; } ecode += 3; } break; /* Match an extended Unicode sequence. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ case OP_EXTUNI: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); { int chartype, script; int category = _pcre_ucp_findprop(c, &chartype, &script); if (category == ucp_M) RRETURN(MATCH_NOMATCH); while (eptr < md->end_subject) { int len = 1; if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); } category = _pcre_ucp_findprop(c, &chartype, &script); if (category != ucp_M) break; eptr += len; } } ecode++; break; #endif /* Match a back reference, possibly repeatedly. Look past the end of the item to see if there is repeat information following. The code is similar to that for character classes, but repeated for efficiency. Then obey similar code to character type repeats - written out again for speed. However, if the referenced string is the empty string, always treat it as matched, any number of times (otherwise there could be infinite loops). */ case OP_REF: { offset = GET2(ecode, 1) << 1; /* Doubled ref number */ ecode += 3; /* Advance past item */ /* If the reference is unset, set the length to be longer than the amount of subject left; this ensures that every attempt at a match fails. We can't just fail here, because of the possibility of quantifiers with zero minima. */ length = (offset >= offset_top || md->offset_vector[offset] < 0)? md->end_subject - eptr + 1 : md->offset_vector[offset+1] - md->offset_vector[offset]; /* Set up for repetition, or handle the non-repeated case */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH); eptr += length; continue; /* With the main loop */ } /* If the length of the reference is zero, just continue with the main loop. */ if (length == 0) continue; /* First, ensure the minimum number of matches are present. We get back the length of the reference string explicitly rather than passing the address of eptr, so that eptr can be a register variable. */ for (i = 1; i <= min; i++) { if (!match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH); eptr += length; } /* If min = max, continue at the same level without recursion. They are not both allowed to be zero. */ if (min == max) continue; /* If minimizing, keep trying and advancing the pointer */ if (minimize) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || !match_ref(offset, eptr, length, md, ims)) RRETURN(MATCH_NOMATCH); eptr += length; } /* Control never gets here */ } /* If maximizing, find the longest string and work backwards */ else { pp = eptr; for (i = min; i < max; i++) { if (!match_ref(offset, eptr, length, md, ims)) break; eptr += length; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); eptr -= length; } RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ /* Match a bit-mapped character class, possibly repeatedly. This op code is used when all the characters in the class have values in the range 0-255, and either the matching is caseful, or the characters are in the range 0-127 when UTF-8 processing is enabled. The only difference between OP_CLASS and OP_NCLASS occurs when a data character outside the range is encountered. First, look past the end of the item to see if there is repeat information following. Then obey similar code to character type repeats - written out again for speed. */ case OP_NCLASS: case OP_CLASS: { data = ecode + 1; /* Save for matching */ ecode += 33; /* Advance past the item */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ min = max = 1; break; } /* First, ensure the minimum number of matches are present. */ #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (c > 255) { if (op == OP_CLASS) RRETURN(MATCH_NOMATCH); } else { if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH); } } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); c = *eptr++; if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH); } } /* If max == min we can continue with the main loop without the need to recurse. */ if (min == max) continue; /* If minimizing, keep testing the rest of the expression and advancing the pointer while it matches the class. */ if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (c > 255) { if (op == OP_CLASS) RRETURN(MATCH_NOMATCH); } else { if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH); } } } else #endif /* Not UTF-8 mode */ { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); c = *eptr++; if ((data[c/8] & (1 << (c&7))) == 0) RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ } /* If maximizing, find the longest possible run, then work backwards. */ else { pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c > 255) { if (op == OP_CLASS) break; } else { if ((data[c/8] & (1 << (c&7))) == 0) break; } eptr += len; } for (;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject) break; c = *eptr; if ((data[c/8] & (1 << (c&7))) == 0) break; eptr++; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); eptr--; } } RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ /* Match an extended character class. This opcode is encountered only in UTF-8 mode, because that's the only time it is compiled. */ #ifdef SUPPORT_UTF8 case OP_XCLASS: { data = ecode + 1 + LINK_SIZE; /* Save for matching */ ecode += GET(ecode, 1); /* Advance past the item */ switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRQUERY: case OP_CRMINQUERY: c = *ecode++ - OP_CRSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; break; case OP_CRRANGE: case OP_CRMINRANGE: minimize = (*ecode == OP_CRMINRANGE); min = GET2(ecode, 1); max = GET2(ecode, 3); if (max == 0) max = INT_MAX; ecode += 5; break; default: /* No repeat follows */ min = max = 1; break; } /* First, ensure the minimum number of matches are present. */ for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH); } /* If max == min we can continue with the main loop without the need to recurse. */ if (min == max) continue; /* If minimizing, keep testing the rest of the expression and advancing the pointer while it matches the class. */ if (minimize) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (!_pcre_xclass(c, data)) RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } /* If maximizing, find the longest possible run, then work backwards. */ else { pp = eptr; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (!_pcre_xclass(c, data)) break; eptr += len; } for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr) } RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } #endif /* End of XCLASS */ /* Match a single character, casefully */ case OP_CHAR: #ifdef SUPPORT_UTF8 if (utf8) { length = 1; ecode++; GETCHARLEN(fc, ecode, length); if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); while (length-- > 0) if (*ecode++ != *eptr++) RRETURN(MATCH_NOMATCH); } else #endif /* Non-UTF-8 mode */ { if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH); if (ecode[1] != *eptr++) RRETURN(MATCH_NOMATCH); ecode += 2; } break; /* Match a single character, caselessly */ case OP_CHARNC: #ifdef SUPPORT_UTF8 if (utf8) { length = 1; ecode++; GETCHARLEN(fc, ecode, length); if (length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); /* If the pattern character's value is < 128, we have only one byte, and can use the fast lookup table. */ if (fc < 128) { if (md->lcc[*ecode++] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); } /* Otherwise we must pick up the subject character */ else { int dc; GETCHARINC(dc, eptr); ecode += length; /* If we have Unicode property support, we can use it to test the other case of the character, if there is one. */ if (fc != dc) { #ifdef SUPPORT_UCP if (dc != _pcre_ucp_othercase(fc)) #endif RRETURN(MATCH_NOMATCH); } } } else #endif /* SUPPORT_UTF8 */ /* Non-UTF-8 mode */ { if (md->end_subject - eptr < 1) RRETURN(MATCH_NOMATCH); if (md->lcc[ecode[1]] != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); ecode += 2; } break; /* Match a single character repeatedly; different opcodes share code. */ case OP_EXACT: min = max = GET2(ecode, 1); ecode += 3; goto REPEATCHAR; case OP_UPTO: case OP_MINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_MINUPTO; ecode += 3; goto REPEATCHAR; case OP_STAR: case OP_MINSTAR: case OP_PLUS: case OP_MINPLUS: case OP_QUERY: case OP_MINQUERY: c = *ecode++ - OP_STAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single-character matches. We can give up quickly if there are fewer than the minimum number of characters left in the subject. */ REPEATCHAR: #ifdef SUPPORT_UTF8 if (utf8) { length = 1; charptr = ecode; GETCHARLEN(fc, ecode, length); if (min * length > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); ecode += length; /* Handle multibyte character matching specially here. There is support for caseless matching if UCP support is present. */ if (length > 1) { int oclength = 0; uschar occhars[8]; #ifdef SUPPORT_UCP int othercase; if ((ims & PCRE_CASELESS) != 0 && (othercase = _pcre_ucp_othercase(fc)) >= 0 && othercase >= 0) oclength = _pcre_ord2utf8(othercase, occhars); #endif /* SUPPORT_UCP */ for (i = 1; i <= min; i++) { if (memcmp(eptr, charptr, length) == 0) eptr += length; /* Need braces because of following else */ else if (oclength == 0) { RRETURN(MATCH_NOMATCH); } else { if (memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH); eptr += oclength; } } if (min == max) continue; if (minimize) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); if (memcmp(eptr, charptr, length) == 0) eptr += length; /* Need braces because of following else */ else if (oclength == 0) { RRETURN(MATCH_NOMATCH); } else { if (memcmp(eptr, occhars, oclength) != 0) RRETURN(MATCH_NOMATCH); eptr += oclength; } } /* Control never gets here */ } else { pp = eptr; for (i = min; i < max; i++) { if (eptr > md->end_subject - length) break; if (memcmp(eptr, charptr, length) == 0) eptr += length; else if (oclength == 0) break; else { if (memcmp(eptr, occhars, oclength) != 0) break; eptr += oclength; } } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); eptr -= length; } RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } /* If the length of a UTF-8 character is 1, we fall through here, and obey the code as for non-UTF-8 characters below, though in this case the value of fc will always be < 128. */ } else #endif /* SUPPORT_UTF8 */ /* When not in UTF-8 mode, load a single-byte character. */ { if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); fc = *ecode++; } /* The value of fc at this point is always less than 256, though we may or may not be in UTF-8 mode. The code is duplicated for the caseless and caseful cases, for speed, since matching characters is likely to be quite common. First, ensure the minimum number of matches are present. If min = max, continue at the same level without recursing. Otherwise, if minimizing, keep trying the rest of the expression and advancing one matching character if failing, up to the maximum. Alternatively, if maximizing, find the maximum number of characters and work backwards. */ DPRINTF(("matching %c{%d,%d} against subject %.*s\n", fc, min, max, max, eptr)); if ((ims & PCRE_CASELESS) != 0) { fc = md->lcc[fc]; for (i = 1; i <= min; i++) if (fc != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); if (min == max) continue; if (minimize) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || fc != md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } else { pp = eptr; for (i = min; i < max; i++) { if (eptr >= md->end_subject || fc != md->lcc[*eptr]) break; eptr++; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); eptr--; if (rrc != MATCH_NOMATCH) RRETURN(rrc); } RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } /* Caseful comparisons (includes all multi-byte characters) */ else { for (i = 1; i <= min; i++) if (fc != *eptr++) RRETURN(MATCH_NOMATCH); if (min == max) continue; if (minimize) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || fc != *eptr++) RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } else { pp = eptr; for (i = min; i < max; i++) { if (eptr >= md->end_subject || fc != *eptr) break; eptr++; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); eptr--; if (rrc != MATCH_NOMATCH) RRETURN(rrc); } RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ /* Match a negated single one-byte character. The character we are checking can be multibyte. */ case OP_NOT: if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); ecode++; GETCHARINCTEST(c, eptr); if ((ims & PCRE_CASELESS) != 0) { #ifdef SUPPORT_UTF8 if (c < 256) #endif c = md->lcc[c]; if (md->lcc[*ecode++] == c) RRETURN(MATCH_NOMATCH); } else { if (*ecode++ == c) RRETURN(MATCH_NOMATCH); } break; /* Match a negated single one-byte character repeatedly. This is almost a repeat of the code for a repeated single character, but I haven't found a nice way of commoning these up that doesn't require a test of the positive/negative option for each character match. Maybe that wouldn't add very much to the time taken, but character matching *is* what this is all about... */ case OP_NOTEXACT: min = max = GET2(ecode, 1); ecode += 3; goto REPEATNOTCHAR; case OP_NOTUPTO: case OP_NOTMINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_NOTMINUPTO; ecode += 3; goto REPEATNOTCHAR; case OP_NOTSTAR: case OP_NOTMINSTAR: case OP_NOTPLUS: case OP_NOTMINPLUS: case OP_NOTQUERY: case OP_NOTMINQUERY: c = *ecode++ - OP_NOTSTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single-byte matches. We can give up quickly if there are fewer than the minimum number of bytes left in the subject. */ REPEATNOTCHAR: if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); fc = *ecode++; /* The code is duplicated for the caseless and caseful cases, for speed, since matching characters is likely to be quite common. First, ensure the minimum number of matches are present. If min = max, continue at the same level without recursing. Otherwise, if minimizing, keep trying the rest of the expression and advancing one matching character if failing, up to the maximum. Alternatively, if maximizing, find the maximum number of characters and work backwards. */ DPRINTF(("negative matching %c{%d,%d} against subject %.*s\n", fc, min, max, max, eptr)); if ((ims & PCRE_CASELESS) != 0) { fc = md->lcc[fc]; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (i = 1; i <= min; i++) { GETCHARINC(d, eptr); if (d < 256) d = md->lcc[d]; if (fc == d) RRETURN(MATCH_NOMATCH); } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) if (fc == md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); } if (min == max) continue; if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); GETCHARINC(d, eptr); if (d < 256) d = md->lcc[d]; if (fi >= max || eptr >= md->end_subject || fc == d) RRETURN(MATCH_NOMATCH); } } else #endif /* Not UTF-8 mode */ { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || fc == md->lcc[*eptr++]) RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ } /* Maximize case */ else { pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(d, eptr, len); if (d < 256) d = md->lcc[d]; if (fc == d) break; eptr += len; } for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject || fc == md->lcc[*eptr]) break; eptr++; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); eptr--; } } RRETURN(MATCH_NOMATCH); } /* Control never gets here */ } /* Caseful comparisons */ else { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (i = 1; i <= min; i++) { GETCHARINC(d, eptr); if (fc == d) RRETURN(MATCH_NOMATCH); } } else #endif /* Not UTF-8 mode */ { for (i = 1; i <= min; i++) if (fc == *eptr++) RRETURN(MATCH_NOMATCH); } if (min == max) continue; if (minimize) { #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); GETCHARINC(d, eptr); if (fi >= max || eptr >= md->end_subject || fc == d) RRETURN(MATCH_NOMATCH); } } else #endif /* Not UTF-8 mode */ { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || fc == *eptr++) RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ } /* Maximize case */ else { pp = eptr; #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { register int d; for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(d, eptr, len); if (fc == d) break; eptr += len; } for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { for (i = min; i < max; i++) { if (eptr >= md->end_subject || fc == *eptr) break; eptr++; } while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); eptr--; } } RRETURN(MATCH_NOMATCH); } } /* Control never gets here */ /* Match a single character type repeatedly; several different opcodes share code. This is very similar to the code for single characters, but we repeat it in the interests of efficiency. */ case OP_TYPEEXACT: min = max = GET2(ecode, 1); minimize = TRUE; ecode += 3; goto REPEATTYPE; case OP_TYPEUPTO: case OP_TYPEMINUPTO: min = 0; max = GET2(ecode, 1); minimize = *ecode == OP_TYPEMINUPTO; ecode += 3; goto REPEATTYPE; case OP_TYPESTAR: case OP_TYPEMINSTAR: case OP_TYPEPLUS: case OP_TYPEMINPLUS: case OP_TYPEQUERY: case OP_TYPEMINQUERY: c = *ecode++ - OP_TYPESTAR; minimize = (c & 1) != 0; min = rep_min[c]; /* Pick up values from tables; */ max = rep_max[c]; /* zero for max => infinity */ if (max == 0) max = INT_MAX; /* Common code for all repeated single character type matches. Note that in UTF-8 mode, '.' matches a character of any length, but for the other character types, the valid characters are all one-byte long. */ REPEATTYPE: ctype = *ecode++; /* Code for the character type */ #ifdef SUPPORT_UCP if (ctype == OP_PROP || ctype == OP_NOTPROP) { prop_fail_result = ctype == OP_NOTPROP; prop_type = *ecode++; prop_value = *ecode++; } else prop_type = -1; #endif /* First, ensure the minimum number of matches are present. Use inline code for maximizing the speed, and do the type test once at the start (i.e. keep it out of the loop). Also we can test that there are at least the minimum number of bytes before we start. This isn't as effective in UTF-8 mode, but it does no harm. Separate the UTF-8 code completely as that is tidier. Also separate the UCP code, which can be the same for both UTF-8 and single-bytes. */ if (min > md->end_subject - eptr) RRETURN(MATCH_NOMATCH); if (min > 0) { #ifdef SUPPORT_UCP if (prop_type >= 0) { switch(prop_type) { case PT_ANY: if (prop_fail_result) RRETURN(MATCH_NOMATCH); for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); } break; case PT_LAMP: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == ucp_Lu || prop_chartype == ucp_Ll || prop_chartype == ucp_Lt) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_GC: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_category == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_PC: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_SC: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_script == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; default: RRETURN(PCRE_ERROR_INTERNAL); break; } } /* Match extended Unicode sequences. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ else if (ctype == OP_EXTUNI) { for (i = 1; i <= min; i++) { GETCHARINCTEST(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category == ucp_M) RRETURN(MATCH_NOMATCH); while (eptr < md->end_subject) { int len = 1; if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); } prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category != ucp_M) break; eptr += len; } } } else #endif /* SUPPORT_UCP */ /* Handle all other cases when the coding is UTF-8 */ #ifdef SUPPORT_UTF8 if (utf8) switch(ctype) { case OP_ANY: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || ((ims & PCRE_DOTALL) == 0 && eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) RRETURN(MATCH_NOMATCH); eptr++; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_ANYBYTE: eptr += min; break; case OP_NOT_DIGIT: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (c < 128 && (md->ctypes[c] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH); } break; case OP_DIGIT: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH); /* No need to skip more bytes - we know it's a 1-byte character */ } break; case OP_NOT_WHITESPACE: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || (*eptr < 128 && (md->ctypes[*eptr++] & ctype_space) != 0)) RRETURN(MATCH_NOMATCH); while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_WHITESPACE: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_space) == 0) RRETURN(MATCH_NOMATCH); /* No need to skip more bytes - we know it's a 1-byte character */ } break; case OP_NOT_WORDCHAR: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || (*eptr < 128 && (md->ctypes[*eptr++] & ctype_word) != 0)) RRETURN(MATCH_NOMATCH); while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } break; case OP_WORDCHAR: for (i = 1; i <= min; i++) { if (eptr >= md->end_subject || *eptr >= 128 || (md->ctypes[*eptr++] & ctype_word) == 0) RRETURN(MATCH_NOMATCH); /* No need to skip more bytes - we know it's a 1-byte character */ } break; default: RRETURN(PCRE_ERROR_INTERNAL); } /* End switch(ctype) */ else #endif /* SUPPORT_UTF8 */ /* Code for the non-UTF-8 case for minimum matching of operators other than OP_PROP and OP_NOTPROP. */ switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0) { for (i = 1; i <= min; i++) { if (eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr)) RRETURN(MATCH_NOMATCH); eptr++; } } else eptr += min; break; case OP_ANYBYTE: eptr += min; break; case OP_NOT_DIGIT: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH); break; case OP_DIGIT: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WHITESPACE: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_space) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WHITESPACE: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_space) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WORDCHAR: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_word) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WORDCHAR: for (i = 1; i <= min; i++) if ((md->ctypes[*eptr++] & ctype_word) == 0) RRETURN(MATCH_NOMATCH); break; default: RRETURN(PCRE_ERROR_INTERNAL); } } /* If min = max, continue at the same level without recursing */ if (min == max) continue; /* If minimizing, we have to test the rest of the pattern before each subsequent match. Again, separate the UTF-8 case for speed, and also separate the UCP cases. */ if (minimize) { #ifdef SUPPORT_UCP if (prop_type >= 0) { switch(prop_type) { case PT_ANY: for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); if (prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_LAMP: for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == ucp_Lu || prop_chartype == ucp_Ll || prop_chartype == ucp_Lt) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_GC: for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_category == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_PC: for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; case PT_SC: for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_script == prop_value) == prop_fail_result) RRETURN(MATCH_NOMATCH); } break; default: RRETURN(PCRE_ERROR_INTERNAL); break; } } /* Match extended Unicode sequences. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ else if (ctype == OP_EXTUNI) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject) RRETURN(MATCH_NOMATCH); GETCHARINCTEST(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category == ucp_M) RRETURN(MATCH_NOMATCH); while (eptr < md->end_subject) { int len = 1; if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); } prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category != ucp_M) break; eptr += len; } } } else #endif /* SUPPORT_UCP */ #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || (ctype == OP_ANY && (ims & PCRE_DOTALL) == 0 && eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) RRETURN(MATCH_NOMATCH); GETCHARINC(c, eptr); switch(ctype) { case OP_ANY: /* This is the DOTALL case */ break; case OP_ANYBYTE: break; case OP_NOT_DIGIT: if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH); break; case OP_DIGIT: if (c >= 256 || (md->ctypes[c] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WHITESPACE: if (c < 256 && (md->ctypes[c] & ctype_space) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WHITESPACE: if (c >= 256 || (md->ctypes[c] & ctype_space) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WORDCHAR: if (c < 256 && (md->ctypes[c] & ctype_word) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WORDCHAR: if (c >= 256 || (md->ctypes[c] & ctype_word) == 0) RRETURN(MATCH_NOMATCH); break; default: RRETURN(PCRE_ERROR_INTERNAL); } } } else #endif /* Not UTF-8 mode */ { for (fi = min;; fi++) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (fi >= max || eptr >= md->end_subject || ((ims & PCRE_DOTALL) == 0 && eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) RRETURN(MATCH_NOMATCH); c = *eptr++; switch(ctype) { case OP_ANY: /* This is the DOTALL case */ break; case OP_ANYBYTE: break; case OP_NOT_DIGIT: if ((md->ctypes[c] & ctype_digit) != 0) RRETURN(MATCH_NOMATCH); break; case OP_DIGIT: if ((md->ctypes[c] & ctype_digit) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WHITESPACE: if ((md->ctypes[c] & ctype_space) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WHITESPACE: if ((md->ctypes[c] & ctype_space) == 0) RRETURN(MATCH_NOMATCH); break; case OP_NOT_WORDCHAR: if ((md->ctypes[c] & ctype_word) != 0) RRETURN(MATCH_NOMATCH); break; case OP_WORDCHAR: if ((md->ctypes[c] & ctype_word) == 0) RRETURN(MATCH_NOMATCH); break; default: RRETURN(PCRE_ERROR_INTERNAL); } } } /* Control never gets here */ } /* If maximizing it is worth using inline code for speed, doing the type test once at the start (i.e. keep it out of the loop). Again, keep the UTF-8 and UCP stuff separate. */ else { pp = eptr; /* Remember where we started */ #ifdef SUPPORT_UCP if (prop_type >= 0) { switch(prop_type) { case PT_ANY: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (prop_fail_result) break; eptr+= len; } break; case PT_LAMP: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == ucp_Lu || prop_chartype == ucp_Ll || prop_chartype == ucp_Lt) == prop_fail_result) break; eptr+= len; } break; case PT_GC: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_category == prop_value) == prop_fail_result) break; eptr+= len; } break; case PT_PC: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_chartype == prop_value) == prop_fail_result) break; eptr+= len; } break; case PT_SC: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if ((prop_script == prop_value) == prop_fail_result) break; eptr+= len; } break; } /* eptr is now past the end of the maximum run */ for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr); } } /* Match extended Unicode sequences. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ else if (ctype == OP_EXTUNI) { for (i = min; i < max; i++) { if (eptr >= md->end_subject) break; GETCHARINCTEST(c, eptr); prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category == ucp_M) break; while (eptr < md->end_subject) { int len = 1; if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); } prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category != ucp_M) break; eptr += len; } } /* eptr is now past the end of the maximum run */ for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ for (;;) /* Move back over one extended */ { int len = 1; BACKCHAR(eptr); if (!utf8) c = *eptr; else { GETCHARLEN(c, eptr, len); } prop_category = _pcre_ucp_findprop(c, &prop_chartype, &prop_script); if (prop_category != ucp_M) break; eptr--; } } } else #endif /* SUPPORT_UCP */ #ifdef SUPPORT_UTF8 /* UTF-8 mode */ if (utf8) { switch(ctype) { case OP_ANY: /* Special code is required for UTF8, but when the maximum is unlimited we don't need it, so we repeat the non-UTF8 code. This is probably worth it, because .* is quite a common idiom. */ if (max < INT_MAX) { if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || (eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) break; eptr++; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } } else { for (i = min; i < max; i++) { if (eptr >= md->end_subject) break; eptr++; while (eptr < md->end_subject && (*eptr & 0xc0) == 0x80) eptr++; } } } /* Handle unlimited UTF-8 repeat */ else { if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || (eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) break; eptr++; } break; } else { c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; } } break; /* The byte case is the same as non-UTF8 */ case OP_ANYBYTE: c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; break; case OP_NOT_DIGIT: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_digit) != 0) break; eptr+= len; } break; case OP_DIGIT: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 ||(md->ctypes[c] & ctype_digit) == 0) break; eptr+= len; } break; case OP_NOT_WHITESPACE: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_space) != 0) break; eptr+= len; } break; case OP_WHITESPACE: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 ||(md->ctypes[c] & ctype_space) == 0) break; eptr+= len; } break; case OP_NOT_WORDCHAR: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c < 256 && (md->ctypes[c] & ctype_word) != 0) break; eptr+= len; } break; case OP_WORDCHAR: for (i = min; i < max; i++) { int len = 1; if (eptr >= md->end_subject) break; GETCHARLEN(c, eptr, len); if (c >= 256 || (md->ctypes[c] & ctype_word) == 0) break; eptr+= len; } break; default: RRETURN(PCRE_ERROR_INTERNAL); } /* eptr is now past the end of the maximum run */ for(;;) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); if (rrc != MATCH_NOMATCH) RRETURN(rrc); if (eptr-- == pp) break; /* Stop if tried at original pos */ BACKCHAR(eptr); } } else #endif /* Not UTF-8 mode */ { switch(ctype) { case OP_ANY: if ((ims & PCRE_DOTALL) == 0) { for (i = min; i < max; i++) { if (eptr >= md->end_subject || (eptr <= md->end_subject - md->nllen && IS_NEWLINE(eptr))) break; eptr++; } break; } /* For DOTALL case, fall through and treat as \C */ case OP_ANYBYTE: c = max - min; if (c > md->end_subject - eptr) c = md->end_subject - eptr; eptr += c; break; case OP_NOT_DIGIT: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) != 0) break; eptr++; } break; case OP_DIGIT: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) == 0) break; eptr++; } break; case OP_NOT_WHITESPACE: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) != 0) break; eptr++; } break; case OP_WHITESPACE: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) == 0) break; eptr++; } break; case OP_NOT_WORDCHAR: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) != 0) break; eptr++; } break; case OP_WORDCHAR: for (i = min; i < max; i++) { if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) == 0) break; eptr++; } break; default: RRETURN(PCRE_ERROR_INTERNAL); } /* eptr is now past the end of the maximum run */ while (eptr >= pp) { RMATCH(rrc, eptr, ecode, offset_top, md, ims, eptrb, 0); eptr--; if (rrc != MATCH_NOMATCH) RRETURN(rrc); } } /* Get here if we can't make it match with any permitted repetitions */ RRETURN(MATCH_NOMATCH); } /* Control never gets here */ /* There's been some horrible disaster. Since all codes > OP_BRA are for capturing brackets, and there shouldn't be any gaps between 0 and OP_BRA, arrival here can only mean there is something seriously wrong in the code above or the OP_xxx definitions. */ default: DPRINTF(("Unknown opcode %d\n", *ecode)); RRETURN(PCRE_ERROR_UNKNOWN_NODE); } /* Do not stick any code in here without much thought; it is assumed that "continue" in the code above comes out to here to repeat the main loop. */ } /* End of main loop */ /* Control never reaches here */ } /*************************************************************************** **************************************************************************** RECURSION IN THE match() FUNCTION Undefine all the macros that were defined above to handle this. */ #ifdef NO_RECURSE #undef eptr #undef ecode #undef offset_top #undef ims #undef eptrb #undef flags #undef callpat #undef charptr #undef data #undef next #undef pp #undef prev #undef saved_eptr #undef new_recursive #undef cur_is_word #undef condition #undef minimize #undef prev_is_word #undef original_ims #undef ctype #undef length #undef max #undef min #undef number #undef offset #undef op #undef save_capture_last #undef save_offset1 #undef save_offset2 #undef save_offset3 #undef stacksave #undef newptrb #endif /* These two are defined as macros in both cases */ #undef fc #undef fi /*************************************************************************** ***************************************************************************/ /************************************************* * Execute a Regular Expression * *************************************************/ /* This function applies a compiled re to a subject string and picks out portions of the string if it matches. Two elements in the vector are set for each substring: the offsets to the start and end of the substring. Arguments: argument_re points to the compiled expression extra_data points to extra data or is NULL subject points to the subject string length length of subject string (may contain binary zeros) start_offset where to start in the subject string options option bits offsets points to a vector of ints to be filled in with offsets offsetcount the number of elements in the vector Returns: > 0 => success; value is the number of elements filled in = 0 => success, but offsets is not big enough -1 => failed to match < -1 => some kind of unexpected problem */ PCRE_DATA_SCOPE int pcre_exec(const pcre *argument_re, const pcre_extra *extra_data, PCRE_SPTR subject, int length, int start_offset, int options, int *offsets, int offsetcount) { int rc, resetcount, ocount; int first_byte = -1; int req_byte = -1; int req_byte2 = -1; int newline; unsigned long int ims; BOOL using_temporary_offsets = FALSE; BOOL anchored; BOOL startline; BOOL firstline; BOOL first_byte_caseless = FALSE; BOOL req_byte_caseless = FALSE; match_data match_block; match_data *md = &match_block; const uschar *tables; const uschar *start_bits = NULL; USPTR start_match = (USPTR)subject + start_offset; USPTR end_subject; USPTR req_byte_ptr = start_match - 1; pcre_study_data internal_study; const pcre_study_data *study; real_pcre internal_re; const real_pcre *external_re = (const real_pcre *)argument_re; const real_pcre *re = external_re; /* Plausibility checks */ if ((options & ~PUBLIC_EXEC_OPTIONS) != 0) return PCRE_ERROR_BADOPTION; if (re == NULL || subject == NULL || (offsets == NULL && offsetcount > 0)) return PCRE_ERROR_NULL; if (offsetcount < 0) return PCRE_ERROR_BADCOUNT; /* Fish out the optional data from the extra_data structure, first setting the default values. */ study = NULL; md->match_limit = MATCH_LIMIT; md->match_limit_recursion = MATCH_LIMIT_RECURSION; md->callout_data = NULL; /* The table pointer is always in native byte order. */ tables = external_re->tables; if (extra_data != NULL) { register unsigned int flags = extra_data->flags; if ((flags & PCRE_EXTRA_STUDY_DATA) != 0) study = (const pcre_study_data *)extra_data->study_data; if ((flags & PCRE_EXTRA_MATCH_LIMIT) != 0) md->match_limit = extra_data->match_limit; if ((flags & PCRE_EXTRA_MATCH_LIMIT_RECURSION) != 0) md->match_limit_recursion = extra_data->match_limit_recursion; if ((flags & PCRE_EXTRA_CALLOUT_DATA) != 0) md->callout_data = extra_data->callout_data; if ((flags & PCRE_EXTRA_TABLES) != 0) tables = extra_data->tables; } /* If the exec call supplied NULL for tables, use the inbuilt ones. This is a feature that makes it possible to save compiled regex and re-use them in other programs later. */ if (tables == NULL) tables = _pcre_default_tables; /* Check that the first field in the block is the magic number. If it is not, test for a regex that was compiled on a host of opposite endianness. If this is the case, flipped values are put in internal_re and internal_study if there was study data too. */ if (re->magic_number != MAGIC_NUMBER) { re = _pcre_try_flipped(re, &internal_re, study, &internal_study); if (re == NULL) return PCRE_ERROR_BADMAGIC; if (study != NULL) study = &internal_study; } /* Set up other data */ anchored = ((re->options | options) & PCRE_ANCHORED) != 0; startline = (re->options & PCRE_STARTLINE) != 0; firstline = (re->options & PCRE_FIRSTLINE) != 0; /* The code starts after the real_pcre block and the capture name table. */ md->start_code = (const uschar *)external_re + re->name_table_offset + re->name_count * re->name_entry_size; md->start_subject = (USPTR)subject; md->start_offset = start_offset; md->end_subject = md->start_subject + length; end_subject = md->end_subject; md->endonly = (re->options & PCRE_DOLLAR_ENDONLY) != 0; md->utf8 = (re->options & PCRE_UTF8) != 0; md->notbol = (options & PCRE_NOTBOL) != 0; md->noteol = (options & PCRE_NOTEOL) != 0; md->notempty = (options & PCRE_NOTEMPTY) != 0; md->partial = (options & PCRE_PARTIAL) != 0; md->hitend = FALSE; md->recursive = NULL; /* No recursion at top level */ md->lcc = tables + lcc_offset; md->ctypes = tables + ctypes_offset; /* Handle different types of newline. The two bits give four cases. If nothing is set at run time, whatever was used at compile time applies. */ switch ((((options & PCRE_NEWLINE_CRLF) == 0)? re->options : options) & PCRE_NEWLINE_CRLF) { default: newline = NEWLINE; break; /* Compile-time default */ case PCRE_NEWLINE_CR: newline = '\r'; break; case PCRE_NEWLINE_LF: newline = '\n'; break; case PCRE_NEWLINE_CR+ PCRE_NEWLINE_LF: newline = ('\r' << 8) | '\n'; break; } if (newline > 255) { md->nllen = 2; md->nl[0] = (newline >> 8) & 255; md->nl[1] = newline & 255; } else { md->nllen = 1; md->nl[0] = newline; } /* Partial matching is supported only for a restricted set of regexes at the moment. */ if (md->partial && (re->options & PCRE_NOPARTIAL) != 0) return PCRE_ERROR_BADPARTIAL; /* Check a UTF-8 string if required. Unfortunately there's no way of passing back the character offset. */ #ifdef SUPPORT_UTF8 if (md->utf8 && (options & PCRE_NO_UTF8_CHECK) == 0) { if (_pcre_valid_utf8((uschar *)subject, length) >= 0) return PCRE_ERROR_BADUTF8; if (start_offset > 0 && start_offset < length) { int tb = ((uschar *)subject)[start_offset]; if (tb > 127) { tb &= 0xc0; if (tb != 0 && tb != 0xc0) return PCRE_ERROR_BADUTF8_OFFSET; } } } #endif /* The ims options can vary during the matching as a result of the presence of (?ims) items in the pattern. They are kept in a local variable so that restoring at the exit of a group is easy. */ ims = re->options & (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL); /* If the expression has got more back references than the offsets supplied can hold, we get a temporary chunk of working store to use during the matching. Otherwise, we can use the vector supplied, rounding down its size to a multiple of 3. */ ocount = offsetcount - (offsetcount % 3); if (re->top_backref > 0 && re->top_backref >= ocount/3) { ocount = re->top_backref * 3 + 3; md->offset_vector = (int *)(pcre_malloc)(ocount * sizeof(int)); if (md->offset_vector == NULL) return PCRE_ERROR_NOMEMORY; using_temporary_offsets = TRUE; DPRINTF(("Got memory to hold back references\n")); } else md->offset_vector = offsets; md->offset_end = ocount; md->offset_max = (2*ocount)/3; md->offset_overflow = FALSE; md->capture_last = -1; /* Compute the minimum number of offsets that we need to reset each time. Doing this makes a huge difference to execution time when there aren't many brackets in the pattern. */ resetcount = 2 + re->top_bracket * 2; if (resetcount > offsetcount) resetcount = ocount; /* Reset the working variable associated with each extraction. These should never be used unless previously set, but they get saved and restored, and so we initialize them to avoid reading uninitialized locations. */ if (md->offset_vector != NULL) { register int *iptr = md->offset_vector + ocount; register int *iend = iptr - resetcount/2 + 1; while (--iptr >= iend) *iptr = -1; } /* Set up the first character to match, if available. The first_byte value is never set for an anchored regular expression, but the anchoring may be forced at run time, so we have to test for anchoring. The first char may be unset for an unanchored pattern, of course. If there's no first char and the pattern was studied, there may be a bitmap of possible first characters. */ if (!anchored) { if ((re->options & PCRE_FIRSTSET) != 0) { first_byte = re->first_byte & 255; if ((first_byte_caseless = ((re->first_byte & REQ_CASELESS) != 0)) == TRUE) first_byte = md->lcc[first_byte]; } else if (!startline && study != NULL && (study->options & PCRE_STUDY_MAPPED) != 0) start_bits = study->start_bits; } /* For anchored or unanchored matches, there may be a "last known required character" set. */ if ((re->options & PCRE_REQCHSET) != 0) { req_byte = re->req_byte & 255; req_byte_caseless = (re->req_byte & REQ_CASELESS) != 0; req_byte2 = (tables + fcc_offset)[req_byte]; /* case flipped */ } /* Loop for handling unanchored repeated matching attempts; for anchored regexs the loop runs just once. */ do { USPTR save_end_subject = end_subject; /* Reset the maximum number of extractions we might see. */ if (md->offset_vector != NULL) { register int *iptr = md->offset_vector; register int *iend = iptr + resetcount; while (iptr < iend) *iptr++ = -1; } /* Advance to a unique first char if possible. If firstline is TRUE, the start of the match is constrained to the first line of a multiline string. Implement this by temporarily adjusting end_subject so that we stop scanning at a newline. If the match fails at the newline, later code breaks this loop. */ if (firstline) { USPTR t = start_match; while (t <= save_end_subject - md->nllen && !IS_NEWLINE(t)) t++; end_subject = t; } /* Now test for a unique first byte */ if (first_byte >= 0) { if (first_byte_caseless) while (start_match < end_subject && md->lcc[*start_match] != first_byte) start_match++; else while (start_match < end_subject && *start_match != first_byte) start_match++; } /* Or to just after a linebreak for a multiline match if possible */ else if (startline) { if (start_match >= md->start_subject + md->nllen + start_offset) { while (start_match <= end_subject && !IS_NEWLINE(start_match - md->nllen)) start_match++; } } /* Or to a non-unique first char after study */ else if (start_bits != NULL) { while (start_match < end_subject) { register unsigned int c = *start_match; if ((start_bits[c/8] & (1 << (c&7))) == 0) start_match++; else break; } } /* Restore fudged end_subject */ end_subject = save_end_subject; #ifdef PCRE_DEBUG /* Sigh. Some compilers never learn. */ printf(">>>> Match against: "); pchars(start_match, end_subject - start_match, TRUE, md); printf("\n"); #endif /* If req_byte is set, we know that that character must appear in the subject for the match to succeed. If the first character is set, req_byte must be later in the subject; otherwise the test starts at the match point. This optimization can save a huge amount of backtracking in patterns with nested unlimited repeats that aren't going to match. Writing separate code for cased/caseless versions makes it go faster, as does using an autoincrement and backing off on a match. HOWEVER: when the subject string is very, very long, searching to its end can take a long time, and give bad performance on quite ordinary patterns. This showed up when somebody was matching /^C/ on a 32-megabyte string... so we don't do this when the string is sufficiently long. ALSO: this processing is disabled when partial matching is requested. */ if (req_byte >= 0 && end_subject - start_match < REQ_BYTE_MAX && !md->partial) { register USPTR p = start_match + ((first_byte >= 0)? 1 : 0); /* We don't need to repeat the search if we haven't yet reached the place we found it at last time. */ if (p > req_byte_ptr) { if (req_byte_caseless) { while (p < end_subject) { register int pp = *p++; if (pp == req_byte || pp == req_byte2) { p--; break; } } } else { while (p < end_subject) { if (*p++ == req_byte) { p--; break; } } } /* If we can't find the required character, break the matching loop */ if (p >= end_subject) break; /* If we have found the required character, save the point where we found it, so that we don't search again next time round the loop if the start hasn't passed this character yet. */ req_byte_ptr = p; } } /* When a match occurs, substrings will be set for all internal extractions; we just need to set up the whole thing as substring 0 before returning. If there were too many extractions, set the return code to zero. In the case where we had to get some local store to hold offsets for backreferences, copy those back references that we can. In this case there need not be overflow if certain parts of the pattern were not used. */ md->start_match = start_match; md->match_call_count = 0; rc = match(start_match, md->start_code, 2, md, ims, NULL, match_isgroup, 0); /* When the result is no match, if the subject's first character was a newline and the PCRE_FIRSTLINE option is set, break (which will return PCRE_ERROR_NOMATCH). The option requests that a match occur before the first newline in the subject. Otherwise, advance the pointer to the next character and continue - but the continuation will actually happen only when the pattern is not anchored. */ if (rc == MATCH_NOMATCH) { if (firstline && start_match <= md->end_subject - md->nllen && IS_NEWLINE(start_match)) break; start_match++; #ifdef SUPPORT_UTF8 if (md->utf8) while(start_match < end_subject && (*start_match & 0xc0) == 0x80) start_match++; #endif continue; } if (rc != MATCH_MATCH) { DPRINTF((">>>> error: returning %d\n", rc)); return rc; } /* We have a match! Copy the offset information from temporary store if necessary */ if (using_temporary_offsets) { if (offsetcount >= 4) { memcpy(offsets + 2, md->offset_vector + 2, (offsetcount - 2) * sizeof(int)); DPRINTF(("Copied offsets from temporary memory\n")); } if (md->end_offset_top > offsetcount) md->offset_overflow = TRUE; DPRINTF(("Freeing temporary memory\n")); (pcre_free)(md->offset_vector); } rc = md->offset_overflow? 0 : md->end_offset_top/2; if (offsetcount < 2) rc = 0; else { offsets[0] = start_match - md->start_subject; offsets[1] = md->end_match_ptr - md->start_subject; } DPRINTF((">>>> returning %d\n", rc)); return rc; } /* This "while" is the end of the "do" above */ while (!anchored && start_match <= end_subject); if (using_temporary_offsets) { DPRINTF(("Freeing temporary memory\n")); (pcre_free)(md->offset_vector); } if (md->partial && md->hitend) { DPRINTF((">>>> returning PCRE_ERROR_PARTIAL\n")); return PCRE_ERROR_PARTIAL; } else { DPRINTF((">>>> returning PCRE_ERROR_NOMATCH\n")); return PCRE_ERROR_NOMATCH; } } /* End of pcre_exec.c */