code/trunk/pcreposix.c

/*************************************************
*      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) 1997-2009 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 is a wrapper that provides a POSIX API to the underlying PCRE
functions. */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


/* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
compiling these functions. This must come before including pcreposix.h, where
they are set for an application (using these functions) if they have not
previously been set. */

#if defined(_WIN32) && !defined(PCRE_STATIC)
#  define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
#  define PCREPOSIX_EXP_DEFN __declspec(dllexport)
#endif

#include "pcre.h"
#include "pcre_internal.h"
#include "pcreposix.h"


/* Table to translate PCRE compile time error codes into POSIX error codes. */

static const int eint[] = {
  0,           /* no error */
  REG_EESCAPE, /* \ at end of pattern */
  REG_EESCAPE, /* \c at end of pattern */
  REG_EESCAPE, /* unrecognized character follows \ */
  REG_BADBR,   /* numbers out of order in {} quantifier */
  /* 5 */ 
  REG_BADBR,   /* number too big in {} quantifier */
  REG_EBRACK,  /* missing terminating ] for character class */
  REG_ECTYPE,  /* invalid escape sequence in character class */
  REG_ERANGE,  /* range out of order in character class */
  REG_BADRPT,  /* nothing to repeat */
  /* 10 */ 
  REG_BADRPT,  /* operand of unlimited repeat could match the empty string */
  REG_ASSERT,  /* internal error: unexpected repeat */
  REG_BADPAT,  /* unrecognized character after (? */
  REG_BADPAT,  /* POSIX named classes are supported only within a class */
  REG_EPAREN,  /* missing ) */
  /* 15 */ 
  REG_ESUBREG, /* reference to non-existent subpattern */
  REG_INVARG,  /* erroffset passed as NULL */
  REG_INVARG,  /* unknown option bit(s) set */
  REG_EPAREN,  /* missing ) after comment */
  REG_ESIZE,   /* parentheses nested too deeply */
  /* 20 */ 
  REG_ESIZE,   /* regular expression too large */
  REG_ESPACE,  /* failed to get memory */
  REG_EPAREN,  /* unmatched parentheses */
  REG_ASSERT,  /* internal error: code overflow */
  REG_BADPAT,  /* unrecognized character after (?< */
  /* 25 */ 
  REG_BADPAT,  /* lookbehind assertion is not fixed length */
  REG_BADPAT,  /* malformed number or name after (?( */
  REG_BADPAT,  /* conditional group contains more than two branches */
  REG_BADPAT,  /* assertion expected after (?( */
  REG_BADPAT,  /* (?R or (?[+-]digits must be followed by ) */
  /* 30 */ 
  REG_ECTYPE,  /* unknown POSIX class name */
  REG_BADPAT,  /* POSIX collating elements are not supported */
  REG_INVARG,  /* this version of PCRE is not compiled with PCRE_UTF8 support */
  REG_BADPAT,  /* spare error */
  REG_BADPAT,  /* character value in \x{...} sequence is too large */
  /* 35 */ 
  REG_BADPAT,  /* invalid condition (?(0) */
  REG_BADPAT,  /* \C not allowed in lookbehind assertion */
  REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
  REG_BADPAT,  /* number after (?C is > 255 */
  REG_BADPAT,  /* closing ) for (?C expected */
  /* 40 */ 
  REG_BADPAT,  /* recursive call could loop indefinitely */
  REG_BADPAT,  /* unrecognized character after (?P */
  REG_BADPAT,  /* syntax error in subpattern name (missing terminator) */
  REG_BADPAT,  /* two named subpatterns have the same name */
  REG_BADPAT,  /* invalid UTF-8 string */
  /* 45 */ 
  REG_BADPAT,  /* support for \P, \p, and \X has not been compiled */
  REG_BADPAT,  /* malformed \P or \p sequence */
  REG_BADPAT,  /* unknown property name after \P or \p */
  REG_BADPAT,  /* subpattern name is too long (maximum 32 characters) */
  REG_BADPAT,  /* too many named subpatterns (maximum 10,000) */
  /* 50 */ 
  REG_BADPAT,  /* repeated subpattern is too long */
  REG_BADPAT,  /* octal value is greater than \377 (not in UTF-8 mode) */
  REG_BADPAT,  /* internal error: overran compiling workspace */
  REG_BADPAT,  /* internal error: previously-checked referenced subpattern not found */
  REG_BADPAT,  /* DEFINE group contains more than one branch */
  /* 55 */ 
  REG_BADPAT,  /* repeating a DEFINE group is not allowed */
  REG_INVARG,  /* inconsistent NEWLINE options */
  REG_BADPAT,  /* \g is not followed followed by an (optionally braced) non-zero number */
  REG_BADPAT,  /* a numbered reference must not be zero */
  REG_BADPAT,  /* (*VERB) with an argument is not supported */
  /* 60 */
  REG_BADPAT,  /* (*VERB) not recognized */ 
  REG_BADPAT,  /* number is too big */
  REG_BADPAT,  /* subpattern name expected */
  REG_BADPAT,  /* digit expected after (?+ */
  REG_BADPAT   /* ] is an invalid data character in JavaScript compatibility mode */
};

/* Table of texts corresponding to POSIX error codes */

static const char *const pstring[] = {
  "",                                /* Dummy for value 0 */
  "internal error",                  /* REG_ASSERT */
  "invalid repeat counts in {}",     /* BADBR      */
  "pattern error",                   /* BADPAT     */
  "? * + invalid",                   /* BADRPT     */
  "unbalanced {}",                   /* EBRACE     */
  "unbalanced []",                   /* EBRACK     */
  "collation error - not relevant",  /* ECOLLATE   */
  "bad class",                       /* ECTYPE     */
  "bad escape sequence",             /* EESCAPE    */
  "empty expression",                /* EMPTY      */
  "unbalanced ()",                   /* EPAREN     */
  "bad range inside []",             /* ERANGE     */
  "expression too big",              /* ESIZE      */
  "failed to get memory",            /* ESPACE     */
  "bad back reference",              /* ESUBREG    */
  "bad argument",                    /* INVARG     */
  "match failed"                     /* NOMATCH    */
};


/*************************************************
*          Translate error code to string        *
*************************************************/

PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
{
const char *message, *addmessage;
size_t length, addlength;

message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
  "unknown error code" : pstring[errcode];
length = strlen(message) + 1;

addmessage = " at offset ";
addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
  strlen(addmessage) + 6 : 0;

if (errbuf_size > 0)
  {
  if (addlength > 0 && errbuf_size >= length + addlength)
    sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
  else
    {
    strncpy(errbuf, message, errbuf_size - 1);
    errbuf[errbuf_size-1] = 0;
    }
  }

return length + addlength;
}


/*************************************************
*           Free store held by a regex           *
*************************************************/

PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
regfree(regex_t *preg)
{
(pcre_free)(preg->re_pcre);
}


/*************************************************
*            Compile a regular expression        *
*************************************************/

/*
Arguments:
  preg        points to a structure for recording the compiled expression
  pattern     the pattern to compile
  cflags      compilation flags

Returns:      0 on success
              various non-zero codes on failure
*/

PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
regcomp(regex_t *preg, const char *pattern, int cflags)
{
const char *errorptr;
int erroffset;
int errorcode;
int options = 0;

if ((cflags & REG_ICASE) != 0)   options |= PCRE_CASELESS;
if ((cflags & REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
if ((cflags & REG_DOTALL) != 0)  options |= PCRE_DOTALL;
if ((cflags & REG_NOSUB) != 0)   options |= PCRE_NO_AUTO_CAPTURE;
if ((cflags & REG_UTF8) != 0)    options |= PCRE_UTF8;

preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
  &erroffset, NULL);
preg->re_erroffset = erroffset;

/* Safety: if the error code is too big for the translation vector (which 
should not happen, but we all make mistakes), return REG_BADPAT. */

if (preg->re_pcre == NULL) 
  {
  return (errorcode < sizeof(eint)/sizeof(const int))?
    eint[errorcode] : REG_BADPAT;
  } 

preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
return 0;
}


/*************************************************
*              Match a regular expression        *
*************************************************/

/* Unfortunately, PCRE requires 3 ints of working space for each captured
substring, so we have to get and release working store instead of just using
the POSIX structures as was done in earlier releases when PCRE needed only 2
ints. However, if the number of possible capturing brackets is small, use a
block of store on the stack, to reduce the use of malloc/free. The threshold is
in a macro that can be changed at configure time.

If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
be set. When this is the case, the nmatch and pmatch arguments are ignored, and
the only result is yes/no/error. */

PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
regexec(const regex_t *preg, const char *string, size_t nmatch,
  regmatch_t pmatch[], int eflags)
{
int rc, so, eo;
int options = 0;
int *ovector = NULL;
int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
BOOL allocated_ovector = FALSE;
BOOL nosub =
  (((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;

if ((eflags & REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
if ((eflags & REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE_NOTEMPTY;

((regex_t *)preg)->re_erroffset = (size_t)(-1);  /* Only has meaning after compile */

/* When no string data is being returned, ensure that nmatch is zero.
Otherwise, ensure the vector for holding the return data is large enough. */

if (nosub) nmatch = 0;

else if (nmatch > 0)
  {
  if (nmatch <= POSIX_MALLOC_THRESHOLD)
    {
    ovector = &(small_ovector[0]);
    }
  else
    {
    if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
    ovector = (int *)malloc(sizeof(int) * nmatch * 3);
    if (ovector == NULL) return REG_ESPACE;
    allocated_ovector = TRUE;
    }
  }

/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
The man page from OS X says "REG_STARTEND affects only the location of the
string, not how it is matched". That is why the "so" value is used to bump the
start location rather than being passed as a PCRE "starting offset". */

if ((eflags & REG_STARTEND) != 0)
  {
  so = pmatch[0].rm_so;
  eo = pmatch[0].rm_eo;
  }
else
  {
  so = 0;
  eo = strlen(string);
  }

rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
  0, options, ovector, nmatch * 3);

if (rc == 0) rc = nmatch;    /* All captured slots were filled in */

if (rc >= 0)
  {
  size_t i;
  if (!nosub)
    {
    for (i = 0; i < (size_t)rc; i++)
      {
      pmatch[i].rm_so = ovector[i*2];
      pmatch[i].rm_eo = ovector[i*2+1];
      }
    if (allocated_ovector) free(ovector);
    for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
    }
  return 0;
  }

else
  {
  if (allocated_ovector) free(ovector);
  switch(rc)
    {
    case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
    case PCRE_ERROR_NULL: return REG_INVARG;
    case PCRE_ERROR_BADOPTION: return REG_INVARG;
    case PCRE_ERROR_BADMAGIC: return REG_INVARG;
    case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
    case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
    case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
    case PCRE_ERROR_BADUTF8: return REG_INVARG;
    case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
    default: return REG_ASSERT;
    }
  }
}

/* End of pcreposix.c */
1	nigel	3	/*************************************************
2			* Perl-Compatible Regular Expressions *
3			*************************************************/
4
5	nigel	77	/* PCRE is a library of functions to support regular expressions whose syntax
6			and semantics are as close as possible to those of the Perl 5 language.
7	nigel	3
8	nigel	77	Written by Philip Hazel
9	ph10	388	Copyright (c) 1997-2009 University of Cambridge
10	nigel	3
11			-----------------------------------------------------------------------------
12	nigel	75	Redistribution and use in source and binary forms, with or without
13			modification, are permitted provided that the following conditions are met:
14	nigel	3
15	nigel	75	* Redistributions of source code must retain the above copyright notice,
16			this list of conditions and the following disclaimer.
17	nigel	3
18	nigel	75	* Redistributions in binary form must reproduce the above copyright
19			notice, this list of conditions and the following disclaimer in the
20			documentation and/or other materials provided with the distribution.
21	nigel	3
22	nigel	75	* Neither the name of the University of Cambridge nor the names of its
23			contributors may be used to endorse or promote products derived from
24			this software without specific prior written permission.
25	nigel	29
26	nigel	75	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27			AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28			IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29			ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30			LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31			CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32			SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33			INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34			CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35			ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36			POSSIBILITY OF SUCH DAMAGE.
37	nigel	3	-----------------------------------------------------------------------------
38			*/
39
40	nigel	77
41			/* This module is a wrapper that provides a POSIX API to the underlying PCRE
42			functions. */
43
44
45	ph10	200	#ifdef HAVE_CONFIG_H
46	ph10	236	#include "config.h"
47	ph10	200	#endif
48	ph10	199
49
50	ph10	200	/* Ensure that the PCREPOSIX_EXP_xxx macros are set appropriately for
51	ph10	199	compiling these functions. This must come before including pcreposix.h, where
52			they are set for an application (using these functions) if they have not
53			previously been set. */
54
55			#if defined(_WIN32) && !defined(PCRE_STATIC)
56			# define PCREPOSIX_EXP_DECL extern __declspec(dllexport)
57			# define PCREPOSIX_EXP_DEFN __declspec(dllexport)
58			#endif
59
60	ph10	236	#include "pcre.h"
61	nigel	77	#include "pcre_internal.h"
62	nigel	3	#include "pcreposix.h"
63
64
65	nigel	77	/* Table to translate PCRE compile time error codes into POSIX error codes. */
66	nigel	3
67	nigel	73	static const int eint[] = {
68	nigel	77	0, /* no error */
69			REG_EESCAPE, /* \ at end of pattern */
70			REG_EESCAPE, /* \c at end of pattern */
71			REG_EESCAPE, /* unrecognized character follows \ */
72			REG_BADBR, /* numbers out of order in {} quantifier */
73	ph10	418	/* 5 */
74	nigel	77	REG_BADBR, /* number too big in {} quantifier */
75			REG_EBRACK, /* missing terminating ] for character class */
76			REG_ECTYPE, /* invalid escape sequence in character class */
77			REG_ERANGE, /* range out of order in character class */
78			REG_BADRPT, /* nothing to repeat */
79	ph10	418	/* 10 */
80	nigel	77	REG_BADRPT, /* operand of unlimited repeat could match the empty string */
81			REG_ASSERT, /* internal error: unexpected repeat */
82			REG_BADPAT, /* unrecognized character after (? */
83			REG_BADPAT, /* POSIX named classes are supported only within a class */
84			REG_EPAREN, /* missing ) */
85	ph10	418	/* 15 */
86	nigel	77	REG_ESUBREG, /* reference to non-existent subpattern */
87			REG_INVARG, /* erroffset passed as NULL */
88			REG_INVARG, /* unknown option bit(s) set */
89			REG_EPAREN, /* missing ) after comment */
90			REG_ESIZE, /* parentheses nested too deeply */
91	ph10	418	/* 20 */
92	nigel	77	REG_ESIZE, /* regular expression too large */
93			REG_ESPACE, /* failed to get memory */
94	ph10	418	REG_EPAREN, /* unmatched parentheses */
95	nigel	77	REG_ASSERT, /* internal error: code overflow */
96			REG_BADPAT, /* unrecognized character after (?< */
97	ph10	418	/* 25 */
98	nigel	77	REG_BADPAT, /* lookbehind assertion is not fixed length */
99	nigel	91	REG_BADPAT, /* malformed number or name after (?( */
100	nigel	93	REG_BADPAT, /* conditional group contains more than two branches */
101	nigel	77	REG_BADPAT, /* assertion expected after (?( */
102	ph10	166	REG_BADPAT, /* (?R or (?[+-]digits must be followed by ) */
103	ph10	418	/* 30 */
104	nigel	77	REG_ECTYPE, /* unknown POSIX class name */
105			REG_BADPAT, /* POSIX collating elements are not supported */
106			REG_INVARG, /* this version of PCRE is not compiled with PCRE_UTF8 support */
107			REG_BADPAT, /* spare error */
108			REG_BADPAT, /* character value in \x{...} sequence is too large */
109	ph10	418	/* 35 */
110	nigel	77	REG_BADPAT, /* invalid condition (?(0) */
111			REG_BADPAT, /* \C not allowed in lookbehind assertion */
112			REG_EESCAPE, /* PCRE does not support \L, \l, \N, \U, or \u */
113			REG_BADPAT, /* number after (?C is > 255 */
114			REG_BADPAT, /* closing ) for (?C expected */
115	ph10	418	/* 40 */
116	nigel	77	REG_BADPAT, /* recursive call could loop indefinitely */
117			REG_BADPAT, /* unrecognized character after (?P */
118	nigel	93	REG_BADPAT, /* syntax error in subpattern name (missing terminator) */
119	nigel	91	REG_BADPAT, /* two named subpatterns have the same name */
120	nigel	77	REG_BADPAT, /* invalid UTF-8 string */
121	ph10	418	/* 45 */
122	nigel	77	REG_BADPAT, /* support for \P, \p, and \X has not been compiled */
123			REG_BADPAT, /* malformed \P or \p sequence */
124	nigel	91	REG_BADPAT, /* unknown property name after \P or \p */
125			REG_BADPAT, /* subpattern name is too long (maximum 32 characters) */
126			REG_BADPAT, /* too many named subpatterns (maximum 10,000) */
127	ph10	418	/* 50 */
128	nigel	91	REG_BADPAT, /* repeated subpattern is too long */
129	nigel	93	REG_BADPAT, /* octal value is greater than \377 (not in UTF-8 mode) */
130			REG_BADPAT, /* internal error: overran compiling workspace */
131			REG_BADPAT, /* internal error: previously-checked referenced subpattern not found */
132			REG_BADPAT, /* DEFINE group contains more than one branch */
133	ph10	418	/* 55 */
134	nigel	93	REG_BADPAT, /* repeating a DEFINE group is not allowed */
135			REG_INVARG, /* inconsistent NEWLINE options */
136	ph10	166	REG_BADPAT, /* \g is not followed followed by an (optionally braced) non-zero number */
137	ph10	418	REG_BADPAT, /* a numbered reference must not be zero */
138			REG_BADPAT, /* (VERB) with an argument is not supported /
139			/* 60 */
140			REG_BADPAT, /* (VERB) not recognized /
141	ph10	268	REG_BADPAT, /* number is too big */
142	ph10	286	REG_BADPAT, /* subpattern name expected */
143	ph10	336	REG_BADPAT, /* digit expected after (?+ */
144			REG_BADPAT /* ] is an invalid data character in JavaScript compatibility mode */
145	nigel	3	};
146
147			/* Table of texts corresponding to POSIX error codes */
148
149	nigel	73	static const char *const pstring[] = {
150	nigel	3	"", /* Dummy for value 0 */
151			"internal error", /* REG_ASSERT */
152			"invalid repeat counts in {}", /* BADBR */
153			"pattern error", /* BADPAT */
154			"? * + invalid", /* BADRPT */
155			"unbalanced {}", /* EBRACE */
156			"unbalanced []", /* EBRACK */
157			"collation error - not relevant", /* ECOLLATE */
158			"bad class", /* ECTYPE */
159			"bad escape sequence", /* EESCAPE */
160			"empty expression", /* EMPTY */
161			"unbalanced ()", /* EPAREN */
162			"bad range inside []", /* ERANGE */
163			"expression too big", /* ESIZE */
164			"failed to get memory", /* ESPACE */
165			"bad back reference", /* ESUBREG */
166			"bad argument", /* INVARG */
167			"match failed" /* NOMATCH */
168			};
169
170
171
172
173			/*************************************************
174			* Translate error code to string *
175			*************************************************/
176
177	ph10	359	PCREPOSIX_EXP_DEFN size_t PCRE_CALL_CONVENTION
178	nigel	3	regerror(int errcode, const regex_t preg, char errbuf, size_t errbuf_size)
179			{
180	nigel	7	const char message, addmessage;
181			size_t length, addlength;
182	nigel	3
183	nigel	7	message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
184	nigel	3	"unknown error code" : pstring[errcode];
185	nigel	7	length = strlen(message) + 1;
186	nigel	3
187	nigel	7	addmessage = " at offset ";
188			addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
189			strlen(addmessage) + 6 : 0;
190	nigel	3
191			if (errbuf_size > 0)
192			{
193	nigel	7	if (addlength > 0 && errbuf_size >= length + addlength)
194	nigel	23	sprintf(errbuf, "%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
195	nigel	3	else
196			{
197			strncpy(errbuf, message, errbuf_size - 1);
198			errbuf[errbuf_size-1] = 0;
199			}
200			}
201
202	nigel	7	return length + addlength;
203	nigel	3	}
204
205
206
207
208			/*************************************************
209			* Free store held by a regex *
210			*************************************************/
211
212	ph10	359	PCREPOSIX_EXP_DEFN void PCRE_CALL_CONVENTION
213	nigel	3	regfree(regex_t *preg)
214			{
215			(pcre_free)(preg->re_pcre);
216			}
217
218
219
220
221			/*************************************************
222			* Compile a regular expression *
223			*************************************************/
224
225			/*
226			Arguments:
227			preg points to a structure for recording the compiled expression
228			pattern the pattern to compile
229			cflags compilation flags
230
231			Returns: 0 on success
232			various non-zero codes on failure
233			*/
234
235	ph10	359	PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
236	nigel	3	regcomp(regex_t preg, const char pattern, int cflags)
237			{
238	nigel	7	const char *errorptr;
239	nigel	3	int erroffset;
240	nigel	77	int errorcode;
241	nigel	3	int options = 0;
242
243	nigel	87	if ((cflags & REG_ICASE) != 0) options \|= PCRE_CASELESS;
244	nigel	3	if ((cflags & REG_NEWLINE) != 0) options \|= PCRE_MULTILINE;
245	nigel	87	if ((cflags & REG_DOTALL) != 0) options \|= PCRE_DOTALL;
246			if ((cflags & REG_NOSUB) != 0) options \|= PCRE_NO_AUTO_CAPTURE;
247			if ((cflags & REG_UTF8) != 0) options \|= PCRE_UTF8;
248	nigel	3
249	nigel	77	preg->re_pcre = pcre_compile2(pattern, options, &errorcode, &errorptr,
250			&erroffset, NULL);
251	nigel	3	preg->re_erroffset = erroffset;
252
253	ph10	418	/* Safety: if the error code is too big for the translation vector (which
254			should not happen, but we all make mistakes), return REG_BADPAT. */
255	nigel	3
256	ph10	418	if (preg->re_pcre == NULL)
257			{
258			return (errorcode < sizeof(eint)/sizeof(const int))?
259			eint[errorcode] : REG_BADPAT;
260			}
261
262	nigel	71	preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
263	nigel	3	return 0;
264			}
265
266
267
268
269			/*************************************************
270			* Match a regular expression *
271			*************************************************/
272
273	nigel	41	/* Unfortunately, PCRE requires 3 ints of working space for each captured
274			substring, so we have to get and release working store instead of just using
275			the POSIX structures as was done in earlier releases when PCRE needed only 2
276	nigel	63	ints. However, if the number of possible capturing brackets is small, use a
277			block of store on the stack, to reduce the use of malloc/free. The threshold is
278	nigel	87	in a macro that can be changed at configure time.
279	nigel	41
280	nigel	87	If REG_NOSUB was specified at compile time, the PCRE_NO_AUTO_CAPTURE flag will
281			be set. When this is the case, the nmatch and pmatch arguments are ignored, and
282			the only result is yes/no/error. */
283
284	ph10	359	PCREPOSIX_EXP_DEFN int PCRE_CALL_CONVENTION
285	nigel	69	regexec(const regex_t preg, const char string, size_t nmatch,
286	nigel	3	regmatch_t pmatch[], int eflags)
287			{
288	ph10	332	int rc, so, eo;
289	nigel	3	int options = 0;
290	nigel	41	int *ovector = NULL;
291	nigel	63	int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
292			BOOL allocated_ovector = FALSE;
293	nigel	87	BOOL nosub =
294			(((const pcre *)preg->re_pcre)->options & PCRE_NO_AUTO_CAPTURE) != 0;
295	nigel	3
296			if ((eflags & REG_NOTBOL) != 0) options \|= PCRE_NOTBOL;
297			if ((eflags & REG_NOTEOL) != 0) options \|= PCRE_NOTEOL;
298	ph10	388	if ((eflags & REG_NOTEMPTY) != 0) options \|= PCRE_NOTEMPTY;
299	nigel	3
300	nigel	69	((regex_t )preg)->re_erroffset = (size_t)(-1); / Only has meaning after compile */
301	nigel	3
302	nigel	87	/* When no string data is being returned, ensure that nmatch is zero.
303			Otherwise, ensure the vector for holding the return data is large enough. */
304
305			if (nosub) nmatch = 0;
306
307			else if (nmatch > 0)
308	nigel	41	{
309	nigel	63	if (nmatch <= POSIX_MALLOC_THRESHOLD)
310			{
311			ovector = &(small_ovector[0]);
312			}
313			else
314			{
315	nigel	87	if (nmatch > INT_MAX/(sizeof(int) * 3)) return REG_ESPACE;
316	nigel	63	ovector = (int )malloc(sizeof(int) nmatch * 3);
317			if (ovector == NULL) return REG_ESPACE;
318			allocated_ovector = TRUE;
319			}
320	nigel	41	}
321
322	ph10	332	/* REG_STARTEND is a BSD extension, to allow for non-NUL-terminated strings.
323			The man page from OS X says "REG_STARTEND affects only the location of the
324	ph10	345	string, not how it is matched". That is why the "so" value is used to bump the
325	ph10	332	start location rather than being passed as a PCRE "starting offset". */
326
327	ph10	345	if ((eflags & REG_STARTEND) != 0)
328	ph10	332	{
329			so = pmatch[0].rm_so;
330			eo = pmatch[0].rm_eo;
331	ph10	345	}
332			else
333	ph10	332	{
334			so = 0;
335			eo = strlen(string);
336			}
337
338			rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string + so, (eo - so),
339	nigel	71	0, options, ovector, nmatch * 3);
340	nigel	3
341	nigel	41	if (rc == 0) rc = nmatch; /* All captured slots were filled in */
342	nigel	3
343	nigel	41	if (rc >= 0)
344	nigel	3	{
345	nigel	7	size_t i;
346	nigel	87	if (!nosub)
347	nigel	41	{
348	nigel	87	for (i = 0; i < (size_t)rc; i++)
349			{
350			pmatch[i].rm_so = ovector[i*2];
351			pmatch[i].rm_eo = ovector[i*2+1];
352			}
353			if (allocated_ovector) free(ovector);
354			for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
355	nigel	41	}
356	nigel	3	return 0;
357			}
358
359	nigel	41	else
360	nigel	3	{
361	nigel	63	if (allocated_ovector) free(ovector);
362	nigel	41	switch(rc)
363			{
364			case PCRE_ERROR_NOMATCH: return REG_NOMATCH;
365			case PCRE_ERROR_NULL: return REG_INVARG;
366			case PCRE_ERROR_BADOPTION: return REG_INVARG;
367			case PCRE_ERROR_BADMAGIC: return REG_INVARG;
368			case PCRE_ERROR_UNKNOWN_NODE: return REG_ASSERT;
369			case PCRE_ERROR_NOMEMORY: return REG_ESPACE;
370	nigel	73	case PCRE_ERROR_MATCHLIMIT: return REG_ESPACE;
371			case PCRE_ERROR_BADUTF8: return REG_INVARG;
372			case PCRE_ERROR_BADUTF8_OFFSET: return REG_INVARG;
373	nigel	41	default: return REG_ASSERT;
374			}
375	nigel	3	}
376			}
377
378			/* End of pcreposix.c */
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