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Diffstat (limited to 'pcre2-10.21/src/pcre2posix.c')
| -rw-r--r-- | pcre2-10.21/src/pcre2posix.c | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/pcre2-10.21/src/pcre2posix.c b/pcre2-10.21/src/pcre2posix.c new file mode 100644 index 00000000..1d6e5b79 --- /dev/null +++ b/pcre2-10.21/src/pcre2posix.c @@ -0,0 +1,335 @@ +/************************************************* +* 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 + Original API code Copyright (c) 1997-2012 University of Cambridge + New API code Copyright (c) 2016 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 PCRE2 +functions. */ + + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + + +/* Ensure that the PCRE2POSIX_EXP_xxx macros are set appropriately for +compiling these functions. This must come before including pcre2posix.h, where +they are set for an application (using these functions) if they have not +previously been set. */ + +#if defined(_WIN32) && !defined(PCRE2_STATIC) +# define PCRE2POSIX_EXP_DECL extern __declspec(dllexport) +# define PCRE2POSIX_EXP_DEFN __declspec(dllexport) +#endif + +/* We include pcre2.h before pcre2_internal.h so that the PCRE2 library +functions are declared as "import" for Windows by defining PCRE2_EXP_DECL as +"import". This is needed even though pcre2_internal.h itself includes pcre2.h, +because it does so after it has set PCRE2_EXP_DECL to "export" if it is not +already set. */ + +#include "pcre2.h" +#include "pcre2_internal.h" +#include "pcre2posix.h" + +/* Table to translate PCRE2 compile time error codes into POSIX error codes. +Only a few PCRE2 errors with a value greater than 23 turn into special POSIX +codes: most go to REG_BADPAT. The second table lists, in pairs, those that +don't. */ + +static const int eint1[] = { + 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_ASSERT, /* internal error: unexpected repeat */ + REG_BADPAT, /* unrecognized character after (? or (?- */ + REG_BADPAT, /* POSIX named classes are supported only within a class */ + REG_BADPAT, /* POSIX collating elements are not supported */ + REG_EPAREN, /* missing ) */ + /* 15 */ + REG_ESUBREG, /* reference to non-existent subpattern */ + REG_INVARG, /* pattern passed as NULL */ + REG_INVARG, /* unknown compile-time option bit(s) */ + 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 closing parenthesis */ + REG_ASSERT /* internal error: code overflow */ + }; + +static const int eint2[] = { + 30, REG_ECTYPE, /* unknown POSIX class name */ + 32, REG_INVARG, /* this version of PCRE2 does not have Unicode support */ + 37, REG_EESCAPE, /* PCRE2 does not support \L, \l, \N{name}, \U, or \u */ + 56, REG_INVARG, /* internal error: unknown newline setting */ +}; + +/* 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 * +*************************************************/ + +PCRE2POSIX_EXP_DEFN size_t PCRE2_CALL_CONVENTION +regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) +{ +int used; +const char *message; + +message = (errcode <= 0 || errcode >= (int)(sizeof(pstring)/sizeof(char *)))? + "unknown error code" : pstring[errcode]; + +if (preg != NULL && (int)preg->re_erroffset != -1) + { + used = snprintf(errbuf, errbuf_size, "%s at offset %-6d", message, + (int)preg->re_erroffset); + } +else + { + used = snprintf(errbuf, errbuf_size, "%s", message); + } + +return used + 1; +} + + + + +/************************************************* +* Free store held by a regex * +*************************************************/ + +PCRE2POSIX_EXP_DEFN void PCRE2_CALL_CONVENTION +regfree(regex_t *preg) +{ +pcre2_match_data_free(preg->re_match_data); +pcre2_code_free(preg->re_pcre2_code); +} + + + + +/************************************************* +* 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 +*/ + +PCRE2POSIX_EXP_DEFN int PCRE2_CALL_CONVENTION +regcomp(regex_t *preg, const char *pattern, int cflags) +{ +PCRE2_SIZE erroffset; +int errorcode; +int options = 0; +int re_nsub = 0; + +if ((cflags & REG_ICASE) != 0) options |= PCRE2_CASELESS; +if ((cflags & REG_NEWLINE) != 0) options |= PCRE2_MULTILINE; +if ((cflags & REG_DOTALL) != 0) options |= PCRE2_DOTALL; +if ((cflags & REG_NOSUB) != 0) options |= PCRE2_NO_AUTO_CAPTURE; +if ((cflags & REG_UTF) != 0) options |= PCRE2_UTF; +if ((cflags & REG_UCP) != 0) options |= PCRE2_UCP; +if ((cflags & REG_UNGREEDY) != 0) options |= PCRE2_UNGREEDY; + +preg->re_pcre2_code = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, + options, &errorcode, &erroffset, NULL); +preg->re_erroffset = erroffset; + +if (preg->re_pcre2_code == NULL) + { + unsigned int i; + + /* A negative value is a UTF error; otherwise all error codes are greater + than COMPILE_ERROR_BASE, but check, just in case. */ + + if (errorcode < COMPILE_ERROR_BASE) return REG_BADPAT; + errorcode -= COMPILE_ERROR_BASE; + + if (errorcode < (int)(sizeof(eint1)/sizeof(const int))) + return eint1[errorcode]; + for (i = 0; i < sizeof(eint2)/(2*sizeof(const int)); i += 2) + if (errorcode == eint2[i]) return eint2[i+1]; + return REG_BADPAT; + } + +(void)pcre2_pattern_info((const pcre2_code *)preg->re_pcre2_code, + PCRE2_INFO_CAPTURECOUNT, &re_nsub); +preg->re_nsub = (size_t)re_nsub; +if ((options & PCRE2_NO_AUTO_CAPTURE) != 0) re_nsub = -1; +preg->re_match_data = pcre2_match_data_create(re_nsub + 1, NULL); + +if (preg->re_match_data == NULL) + { + pcre2_code_free(preg->re_pcre2_code); + return REG_ESPACE; + } + +return 0; +} + + + +/************************************************* +* Match a regular expression * +*************************************************/ + +/* A suitable match_data block, large enough to hold all possible captures, was +obtained when the pattern was compiled, to save having to allocate and free it +for each match. 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. */ + +PCRE2POSIX_EXP_DEFN int PCRE2_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; +pcre2_match_data *md = (pcre2_match_data *)preg->re_match_data; + +if ((eflags & REG_NOTBOL) != 0) options |= PCRE2_NOTBOL; +if ((eflags & REG_NOTEOL) != 0) options |= PCRE2_NOTEOL; +if ((eflags & REG_NOTEMPTY) != 0) options |= PCRE2_NOTEMPTY; + +((regex_t *)preg)->re_erroffset = (size_t)(-1); /* Only has meaning after compile */ + +/* When no string data is being returned, or no vector has been passed in which +to put it, ensure that nmatch is zero. */ + +if ((((pcre2_real_code *)(preg->re_pcre2_code))->compile_options & + PCRE2_NO_AUTO_CAPTURE) != 0 || pmatch == NULL) nmatch = 0; + +/* 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 PCRE2 "starting offset". */ + +if ((eflags & REG_STARTEND) != 0) + { + if (pmatch == NULL) return REG_INVARG; + so = pmatch[0].rm_so; + eo = pmatch[0].rm_eo; + } +else + { + so = 0; + eo = (int)strlen(string); + } + +rc = pcre2_match((const pcre2_code *)preg->re_pcre2_code, + (PCRE2_SPTR)string + so, (eo - so), 0, options, md, NULL); + +/* Successful match */ + +if (rc >= 0) + { + size_t i; + if ((size_t)rc > nmatch) rc = (int)nmatch; + for (i = 0; i < (size_t)rc; i++) + { + pmatch[i].rm_so = md->ovector[i*2]; + pmatch[i].rm_eo = md->ovector[i*2+1]; + } + for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1; + return 0; + } + +/* Unsuccessful match */ + +if (rc <= PCRE2_ERROR_UTF8_ERR1 && rc >= PCRE2_ERROR_UTF8_ERR21) + return REG_INVARG; + +switch(rc) + { + default: return REG_ASSERT; + case PCRE2_ERROR_BADMODE: return REG_INVARG; + case PCRE2_ERROR_BADMAGIC: return REG_INVARG; + case PCRE2_ERROR_BADOPTION: return REG_INVARG; + case PCRE2_ERROR_BADUTFOFFSET: return REG_INVARG; + case PCRE2_ERROR_MATCHLIMIT: return REG_ESPACE; + case PCRE2_ERROR_NOMATCH: return REG_NOMATCH; + case PCRE2_ERROR_NOMEMORY: return REG_ESPACE; + case PCRE2_ERROR_NULL: return REG_INVARG; + } +} + +/* End of pcre2posix.c */ |