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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@395421 13f79535-47bb-0310-9956-ffa450edef68
231 lines
7.2 KiB
C
231 lines
7.2 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/*
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This is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language. See
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the file Tech.Notes for some information on the internals.
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This module is a wrapper that provides a POSIX API to the underlying PCRE
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functions.
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Written by: Philip Hazel <ph10@cam.ac.uk>
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Copyright (c) 1997-2004 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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#include "httpd.h"
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#include "apr_strings.h"
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#include "pcre.h"
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#ifndef POSIX_MALLOC_THRESHOLD
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#define POSIX_MALLOC_THRESHOLD (10)
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#endif
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/* Table of error strings corresponding to POSIX error codes; must be
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* kept in synch with include/ap_regex.h's AP_REG_E* definitions. */
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static const char *const pstring[] = {
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"", /* Dummy for value 0 */
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"internal error", /* AP_REG_ASSERT */
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"failed to get memory", /* AP_REG_ESPACE */
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"bad argument", /* AP_REG_INVARG */
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"match failed" /* AP_REG_NOMATCH */
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};
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AP_DECLARE(apr_size_t) ap_regerror(int errcode, const ap_regex_t *preg,
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char *errbuf, apr_size_t errbuf_size)
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{
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const char *message, *addmessage;
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apr_size_t length, addlength;
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message = (errcode >= (int)(sizeof(pstring)/sizeof(char *)))?
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"unknown error code" : pstring[errcode];
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length = strlen(message) + 1;
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addmessage = " at offset ";
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addlength = (preg != NULL && (int)preg->re_erroffset != -1)?
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strlen(addmessage) + 6 : 0;
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if (errbuf_size > 0)
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{
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if (addlength > 0 && errbuf_size >= length + addlength)
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apr_snprintf(errbuf, sizeof errbuf,
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"%s%s%-6d", message, addmessage, (int)preg->re_erroffset);
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else
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{
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strncpy(errbuf, message, errbuf_size - 1);
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errbuf[errbuf_size-1] = 0;
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}
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}
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return length + addlength;
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}
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/*************************************************
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* Free store held by a regex *
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*************************************************/
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AP_DECLARE(void) ap_regfree(ap_regex_t *preg)
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{
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(pcre_free)(preg->re_pcre);
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}
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/*************************************************
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* Compile a regular expression *
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*************************************************/
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/*
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Arguments:
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preg points to a structure for recording the compiled expression
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pattern the pattern to compile
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cflags compilation flags
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Returns: 0 on success
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various non-zero codes on failure
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*/
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AP_DECLARE(int) ap_regcomp(ap_regex_t *preg, const char *pattern, int cflags)
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{
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const char *errorptr;
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int erroffset;
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int options = 0;
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if ((cflags & AP_REG_ICASE) != 0) options |= PCRE_CASELESS;
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if ((cflags & AP_REG_NEWLINE) != 0) options |= PCRE_MULTILINE;
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preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL);
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preg->re_erroffset = erroffset;
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if (preg->re_pcre == NULL) return AP_REG_INVARG;
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preg->re_nsub = pcre_info((const pcre *)preg->re_pcre, NULL, NULL);
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return 0;
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}
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/*************************************************
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* Match a regular expression *
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*************************************************/
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/* Unfortunately, PCRE requires 3 ints of working space for each captured
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substring, so we have to get and release working store instead of just using
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the POSIX structures as was done in earlier releases when PCRE needed only 2
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ints. However, if the number of possible capturing brackets is small, use a
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block of store on the stack, to reduce the use of malloc/free. The threshold is
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in a macro that can be changed at configure time. */
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AP_DECLARE(int) ap_regexec(const ap_regex_t *preg, const char *string,
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apr_size_t nmatch, ap_regmatch_t pmatch[],
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int eflags)
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{
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int rc;
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int options = 0;
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int *ovector = NULL;
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int small_ovector[POSIX_MALLOC_THRESHOLD * 3];
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int allocated_ovector = 0;
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if ((eflags & AP_REG_NOTBOL) != 0) options |= PCRE_NOTBOL;
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if ((eflags & AP_REG_NOTEOL) != 0) options |= PCRE_NOTEOL;
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((ap_regex_t *)preg)->re_erroffset = (apr_size_t)(-1); /* Only has meaning after compile */
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if (nmatch > 0)
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{
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if (nmatch <= POSIX_MALLOC_THRESHOLD)
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{
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ovector = &(small_ovector[0]);
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}
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else
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{
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ovector = (int *)malloc(sizeof(int) * nmatch * 3);
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if (ovector == NULL) return AP_REG_ESPACE;
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allocated_ovector = 1;
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}
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}
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rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string),
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0, options, ovector, nmatch * 3);
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if (rc == 0) rc = nmatch; /* All captured slots were filled in */
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if (rc >= 0)
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{
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apr_size_t i;
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for (i = 0; i < (apr_size_t)rc; i++)
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{
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pmatch[i].rm_so = ovector[i*2];
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pmatch[i].rm_eo = ovector[i*2+1];
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}
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if (allocated_ovector) free(ovector);
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for (; i < nmatch; i++) pmatch[i].rm_so = pmatch[i].rm_eo = -1;
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return 0;
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}
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else
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{
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if (allocated_ovector) free(ovector);
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switch(rc)
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{
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case PCRE_ERROR_NOMATCH: return AP_REG_NOMATCH;
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case PCRE_ERROR_NULL: return AP_REG_INVARG;
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case PCRE_ERROR_BADOPTION: return AP_REG_INVARG;
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case PCRE_ERROR_BADMAGIC: return AP_REG_INVARG;
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case PCRE_ERROR_UNKNOWN_NODE: return AP_REG_ASSERT;
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case PCRE_ERROR_NOMEMORY: return AP_REG_ESPACE;
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#ifdef PCRE_ERROR_MATCHLIMIT
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case PCRE_ERROR_MATCHLIMIT: return AP_REG_ESPACE;
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#endif
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#ifdef PCRE_ERROR_BADUTF8
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case PCRE_ERROR_BADUTF8: return AP_REG_INVARG;
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#endif
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#ifdef PCRE_ERROR_BADUTF8_OFFSET
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case PCRE_ERROR_BADUTF8_OFFSET: return AP_REG_INVARG;
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#endif
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default: return AP_REG_ASSERT;
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}
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}
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}
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/* End of pcreposix.c */
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