/************************************************* * Perl-Compatible Regular Expressions * *************************************************/ /* This 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. See the file Tech.Notes for some information on the internals. This module is a wrapper that provides a POSIX API to the underlying PCRE functions. Written by: Philip Hazel <ph10@cam.ac.uk> Copyright (c) 1997-2004 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. ----------------------------------------------------------------------------- */ #include "httpd.h" #include "apr_strings.h" #include "pcre.h" #define APR_WANT_STRFUNC #include "apr_want.h" #ifndef POSIX_MALLOC_THRESHOLD #define POSIX_MALLOC_THRESHOLD (10) #endif /* Table of error strings corresponding to POSIX error codes; must be * kept in synch with include/ap_regex.h's AP_REG_E* definitions. */ static const char *const pstring[] = { "", /* Dummy for value 0 */ "internal error", /* AP_REG_ASSERT */ "failed to get memory", /* AP_REG_ESPACE */ "bad argument", /* AP_REG_INVARG */ "match failed" /* AP_REG_NOMATCH */ }; AP_DECLARE(apr_size_t) ap_regerror(int errcode, const ap_regex_t *preg, char *errbuf, apr_size_t errbuf_size) { const char *message, *addmessage; apr_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) apr_snprintf(errbuf, sizeof 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 * *************************************************/ AP_DECLARE(void) ap_regfree(ap_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 */ AP_DECLARE(int) ap_regcomp(ap_regex_t *preg, const char *pattern, int cflags) { const char *errorptr; int erroffset; int options = 0; if ((cflags & AP_REG_ICASE) != 0) options |= PCRE_CASELESS; if ((cflags & AP_REG_NEWLINE) != 0) options |= PCRE_MULTILINE; preg->re_pcre = pcre_compile(pattern, options, &errorptr, &erroffset, NULL); preg->re_erroffset = erroffset; if (preg->re_pcre == NULL) return AP_REG_INVARG; 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. */ AP_DECLARE(int) ap_regexec(const ap_regex_t *preg, const char *string, apr_size_t nmatch, ap_regmatch_t pmatch[], int eflags) { int rc; int options = 0; int *ovector = NULL; int small_ovector[POSIX_MALLOC_THRESHOLD * 3]; int allocated_ovector = 0; if ((eflags & AP_REG_NOTBOL) != 0) options |= PCRE_NOTBOL; if ((eflags & AP_REG_NOTEOL) != 0) options |= PCRE_NOTEOL; ((ap_regex_t *)preg)->re_erroffset = (apr_size_t)(-1); /* Only has meaning after compile */ if (nmatch > 0) { if (nmatch <= POSIX_MALLOC_THRESHOLD) { ovector = &(small_ovector[0]); } else { ovector = (int *)malloc(sizeof(int) * nmatch * 3); if (ovector == NULL) return AP_REG_ESPACE; allocated_ovector = 1; } } rc = pcre_exec((const pcre *)preg->re_pcre, NULL, string, (int)strlen(string), 0, options, ovector, nmatch * 3); if (rc == 0) rc = nmatch; /* All captured slots were filled in */ if (rc >= 0) { apr_size_t i; for (i = 0; i < (apr_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 AP_REG_NOMATCH; case PCRE_ERROR_NULL: return AP_REG_INVARG; case PCRE_ERROR_BADOPTION: return AP_REG_INVARG; case PCRE_ERROR_BADMAGIC: return AP_REG_INVARG; case PCRE_ERROR_UNKNOWN_NODE: return AP_REG_ASSERT; case PCRE_ERROR_NOMEMORY: return AP_REG_ESPACE; #ifdef PCRE_ERROR_MATCHLIMIT case PCRE_ERROR_MATCHLIMIT: return AP_REG_ESPACE; #endif #ifdef PCRE_ERROR_BADUTF8 case PCRE_ERROR_BADUTF8: return AP_REG_INVARG; #endif #ifdef PCRE_ERROR_BADUTF8_OFFSET case PCRE_ERROR_BADUTF8_OFFSET: return AP_REG_INVARG; #endif default: return AP_REG_ASSERT; } } } /* End of pcreposix.c */