+++ /dev/null
-const char pcrs_rcs[] = "$Id: pcrs.c,v 2.4 2003/01/21 02:49:27 david__schmidt Exp $";
-
-/*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/src/pcrs.c,v $
- *
- * Purpose : pcrs is a supplement to the pcre library by Philip Hazel
- * <ph10@cam.ac.uk> and adds Perl-style substitution. That
- * is, it mimics Perl's 's' operator. See pcrs(3) for details.
- *
- *
- * Copyright : Written and Copyright (C) 2000, 2001 by Andreas S. Oesterhelt
- * <andreas@oesterhelt.org>
- *
- * This program is free software; you can redistribute it
- * and/or modify it under the terms of the GNU Lesser
- * General Public License (LGPL), version 2.1, which should
- * be included in this distribution (see LICENSE.txt), with
- * the exception that the permission to replace that license
- * with the GNU General Public License (GPL) given in section
- * 3 is restricted to version 2 of the GPL.
- *
- * This program is distributed in the hope that it will
- * be useful, but WITHOUT ANY WARRANTY; without even the
- * implied warranty of MERCHANTABILITY or FITNESS FOR A
- * PARTICULAR PURPOSE. See the license for more details.
- *
- * The GNU Lesser General Public License should be included
- * with this file. If not, you can view it at
- * http://www.gnu.org/licenses/lgpl.html
- * or write to the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Revisions :
- * $Log: pcrs.c,v $
- * Revision 2.4 2003/01/21 02:49:27 david__schmidt
- * Developer TODO 612294: src: C++ keyword as variable name
- * I changed all ocurrences of 'new' to 'new_something' wherever I found
- * one. I also brought up all the source files in MSDEV to see if I could
- * spot any highlighted keywords that really were variables. Non-scientific,
- * but at least I tried. :-)
- *
- * Revision 2.3 2002/10/08 16:25:30 oes
- * Bugfix: Need to check validity of backreferences explicitly, because when max_matches are reached and matches is expanded, realloc() does not zero the memory. Fixes Bug # 606227
- *
- * Revision 2.2 2002/09/04 15:52:02 oes
- * Synced with the stable branch:
- * Revision 1.19.2.1 2002/08/10 11:23:40 oes
- * Include prce.h via project.h, where the appropriate
- * source will have been selected
- *
- * Revision 2.1 2002/08/26 11:18:24 sarantis
- * Fix typo.
- *
- * Revision 2.0 2002/06/04 14:34:21 jongfoster
- * Moving source files to src/
- *
- * Revision 1.19 2002/03/08 14:47:48 oes
- * Cosmetics
- *
- * Revision 1.18 2002/03/08 14:17:14 oes
- * Fixing -Wconversion warnings
- *
- * Revision 1.17 2002/03/08 13:45:48 oes
- * Hiding internal functions
- *
- * Revision 1.16 2001/11/30 21:32:14 jongfoster
- * Fixing signed/unsigned comparison (Andreas please check this!)
- * One tab->space
- *
- * Revision 1.15 2001/09/20 16:11:06 steudten
- *
- * Add casting for some string functions.
- *
- * Revision 1.14 2001/09/09 21:41:57 oes
- * Fixing yet another silly bug
- *
- * Revision 1.13 2001/09/06 14:05:59 oes
- * Fixed silly bug
- *
- * Revision 1.12 2001/08/18 11:35:00 oes
- * - Introduced pcrs_strerror()
- * - made some NULL arguments non-fatal
- * - added support for \n \r \e \b \t \f \a \0 in substitute
- * - made quoting adhere to standard rules
- * - added warning for bad backrefs
- * - added pcrs_execute_list()
- * - fixed comments
- * - bugfix & cosmetics
- *
- * Revision 1.11 2001/08/15 15:32:03 oes
- * - Added support for Perl's special variables $+, $' and $`
- * - Improved the substitute parser
- * - Replaced the hard limit for the maximum number of matches
- * by dynamic reallocation
- *
- * Revision 1.10 2001/08/05 13:13:11 jongfoster
- * Making parameters "const" where possible.
- *
- * Revision 1.9 2001/07/18 17:27:00 oes
- * Changed interface; Cosmetics
- *
- * Revision 1.8 2001/06/29 21:45:41 oes
- * Indentation, CRLF->LF, Tab-> Space
- *
- * Revision 1.7 2001/06/29 13:33:04 oes
- * - Cleaned up, renamed and reordered functions,
- * improved comments
- * - Removed my_strsep
- * - Replaced globalflag with a general flags int
- * that holds PCRS_GLOBAL, PCRS_SUCCESS, and PCRS_TRIVIAL
- * - Introduced trivial option that will prevent pcrs
- * from honouring backreferences in the substitute,
- * which is useful for large substitutes that are
- * red in from somewhere and saves the pain of escaping
- * the backrefs
- * - Introduced convenience function pcrs_free_joblist()
- * - Split pcrs_make_job() into pcrs_compile(), which still
- * takes a complete s/// comand as argument and parses it,
- * and a new function pcrs_make_job, which takes the
- * three separate components. This should make for a
- * much friendlier frontend.
- * - Removed create_pcrs_job() which was useless
- * - Fixed a bug in pcrs_execute
- * - Success flag is now handled by pcrs instead of user
- *
- * Revision 1.6 2001/06/03 19:12:45 oes
- * added FIXME
- *
- * Revision 1.5 2001/05/29 09:50:24 jongfoster
- * (Fixed one int -> size_t)
- *
- * Revision 1.4 2001/05/25 14:12:40 oes
- * Fixed bug: Empty substitutes now detected
- *
- * Revision 1.3 2001/05/25 11:03:55 oes
- * Added sanity check for NULL jobs to pcrs_exec_substitution
- *
- * Revision 1.2 2001/05/22 18:46:04 oes
- *
- * Added support for PCRE_UNGREEDY behaviour to pcrs,
- * which is selected by the (nonstandard and therefore
- * capital) letter 'U' in the option string.
- * It causes the quantifiers to be ungreedy by default.
- * Appending a ? turns back to greedy (!).
- *
- * Revision 1.1.1.1 2001/05/15 13:59:02 oes
- * Initial import of version 2.9.3 source tree
- *
- *
- *********************************************************************/
-\f
-
-/*
- * Include project.h just so that the right pcre.h gets
- * included from there
- */
-#include "project.h"
-
-#include <string.h>
-#include <ctype.h>
-
-#include "pcrs.h"
-
-const char pcrs_h_rcs[] = PCRS_H_VERSION;
-
-/*
- * Internal prototypes
- */
-
-static int pcrs_parse_perl_options(const char *optstring, int *flags);
-static pcrs_substitute *pcrs_compile_replacement(const char *replacement, int trivialflag,
- int capturecount, int *errptr);
-
-/*********************************************************************
- *
- * Function : pcrs_strerror
- *
- * Description : Return a string describing a given error code.
- *
- * Parameters :
- * 1 : error = the error code
- *
- * Returns : char * to the descriptive string
- *
- *********************************************************************/
-const char *pcrs_strerror(const int error)
-{
- if (error < 0)
- {
- switch (error)
- {
- /* Passed-through PCRE error: */
- case PCRE_ERROR_NOMEMORY: return "(pcre:) No memory";
-
- /* Shouldn't happen unless PCRE or PCRS bug, or user messed with compiled job: */
- case PCRE_ERROR_NULL: return "(pcre:) NULL code or subject or ovector";
- case PCRE_ERROR_BADOPTION: return "(pcre:) Unrecognized option bit";
- case PCRE_ERROR_BADMAGIC: return "(pcre:) Bad magic number in code";
- case PCRE_ERROR_UNKNOWN_NODE: return "(pcre:) Bad node in pattern";
-
- /* Can't happen / not passed: */
- case PCRE_ERROR_NOSUBSTRING: return "(pcre:) Fire in power supply";
- case PCRE_ERROR_NOMATCH: return "(pcre:) Water in power supply";
-
- /* PCRS errors: */
- case PCRS_ERR_NOMEM: return "(pcrs:) No memory";
- case PCRS_ERR_CMDSYNTAX: return "(pcrs:) Syntax error while parsing command";
- case PCRS_ERR_STUDY: return "(pcrs:) PCRE error while studying the pattern";
- case PCRS_ERR_BADJOB: return "(pcrs:) Bad job - NULL job, pattern or substitute";
- case PCRS_WARN_BADREF: return "(pcrs:) Backreference out of range";
-
- /* What's that? */
- default: return "Unknown error";
- }
- }
- /* error >= 0: No error */
- return "(pcrs:) Everything's just fine. Thanks for asking.";
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_parse_perl_options
- *
- * Description : This function parses a string containing the options to
- * Perl's s/// operator. It returns an integer that is the
- * pcre equivalent of the symbolic optstring.
- * Since pcre doesn't know about Perl's 'g' (global) or pcrs',
- * 'T' (trivial) options but pcrs needs them, the corresponding
- * flags are set if 'g'or 'T' is encountered.
- * Note: The 'T' and 'U' options do not conform to Perl.
- *
- * Parameters :
- * 1 : optstring = string with options in perl syntax
- * 2 : flags = see description
- *
- * Returns : option integer suitable for pcre
- *
- *********************************************************************/
-static int pcrs_parse_perl_options(const char *optstring, int *flags)
-{
- size_t i;
- int rc = 0;
- *flags = 0;
-
- if (NULL == optstring) return 0;
-
- for (i = 0; i < strlen(optstring); i++)
- {
- switch(optstring[i])
- {
- case 'e': break; /* ToDo ;-) */
- case 'g': *flags |= PCRS_GLOBAL; break;
- case 'i': rc |= PCRE_CASELESS; break;
- case 'm': rc |= PCRE_MULTILINE; break;
- case 'o': break;
- case 's': rc |= PCRE_DOTALL; break;
- case 'x': rc |= PCRE_EXTENDED; break;
- case 'U': rc |= PCRE_UNGREEDY; break;
- case 'T': *flags |= PCRS_TRIVIAL; break;
- default: break;
- }
- }
- return rc;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_compile_replacement
- *
- * Description : This function takes a Perl-style replacement (2nd argument
- * to the s/// operator and returns a compiled pcrs_substitute,
- * or NULL if memory allocation for the substitute structure
- * fails.
- *
- * Parameters :
- * 1 : replacement = replacement part of s/// operator
- * in perl syntax
- * 2 : trivialflag = Flag that causes backreferences to be
- * ignored.
- * 3 : capturecount = Number of capturing subpatterns in
- * the pattern. Needed for $+ handling.
- * 4 : errptr = pointer to an integer in which error
- * conditions can be returned.
- *
- * Returns : pcrs_substitute data structure, or NULL if an
- * error is encountered. In that case, *errptr has
- * the reason.
- *
- *********************************************************************/
-static pcrs_substitute *pcrs_compile_replacement(const char *replacement, int trivialflag, int capturecount, int *errptr)
-{
- int i, k, l, quoted;
- size_t length;
- char *text;
- pcrs_substitute *r;
-
- i = k = l = quoted = 0;
-
- /*
- * Sanity check
- */
- if (NULL == replacement)
- {
- replacement = "";
- }
-
- /*
- * Get memory or fail
- */
- if (NULL == (r = (pcrs_substitute *)malloc(sizeof(pcrs_substitute))))
- {
- *errptr = PCRS_ERR_NOMEM;
- return NULL;
- }
- memset(r, '\0', sizeof(pcrs_substitute));
-
- length = strlen(replacement);
-
- if (NULL == (text = (char *)malloc(length + 1)))
- {
- free(r);
- *errptr = PCRS_ERR_NOMEM;
- return NULL;
- }
- memset(text, '\0', length + 1);
-
-
- /*
- * In trivial mode, just copy the substitute text
- */
- if (trivialflag)
- {
- text = strncpy(text, replacement, length + 1);
- k = length;
- }
-
- /*
- * Else, parse, cut out and record all backreferences
- */
- else
- {
- while (i < (int)length)
- {
- /* Quoting */
- if (replacement[i] == '\\')
- {
- if (quoted)
- {
- text[k++] = replacement[i++];
- quoted = 0;
- }
- else
- {
- if (replacement[i+1] && strchr("tnrfae0", replacement[i+1]))
- {
- switch (replacement[++i])
- {
- case 't':
- text[k++] = '\t';
- break;
- case 'n':
- text[k++] = '\n';
- break;
- case 'r':
- text[k++] = '\r';
- break;
- case 'f':
- text[k++] = '\f';
- break;
- case 'a':
- text[k++] = 7;
- break;
- case 'e':
- text[k++] = 27;
- break;
- case '0':
- text[k++] = '\0';
- break;
- }
- i++;
- }
- else
- {
- quoted = 1;
- i++;
- }
- }
- continue;
- }
-
- /* Backreferences */
- if (replacement[i] == '$' && !quoted && i < (int)(length - 1))
- {
- char *symbol, symbols[] = "'`+&";
- r->block_length[l] = k - r->block_offset[l];
-
- /* Numerical backreferences */
- if (isdigit((int)replacement[i + 1]))
- {
- while (i < (int)length && isdigit((int)replacement[++i]))
- {
- r->backref[l] = r->backref[l] * 10 + replacement[i] - 48;
- }
- if (r->backref[l] > capturecount)
- {
- *errptr = PCRS_WARN_BADREF;
- }
- }
-
- /* Symbolic backreferences: */
- else if (NULL != (symbol = strchr(symbols, replacement[i + 1])))
- {
-
- if (symbol - symbols == 2) /* $+ */
- {
- r->backref[l] = capturecount;
- }
- else if (symbol - symbols == 3) /* $& */
- {
- r->backref[l] = 0;
- }
- else /* $' or $` */
- {
- r->backref[l] = PCRS_MAX_SUBMATCHES + 1 - (symbol - symbols);
- }
- i += 2;
- }
-
- /* Invalid backref -> plain '$' */
- else
- {
- goto plainchar;
- }
-
- /* Valid and in range? -> record */
- if (r->backref[l] < PCRS_MAX_SUBMATCHES + 2)
- {
- r->backref_count[r->backref[l]] += 1;
- r->block_offset[++l] = k;
- }
- else
- {
- *errptr = PCRS_WARN_BADREF;
- }
- continue;
- }
-
-plainchar:
- /* Plain chars are copied */
- text[k++] = replacement[i++];
- quoted = 0;
- }
- } /* -END- if (!trivialflag) */
-
- /*
- * Finish & return
- */
- r->text = text;
- r->backrefs = l;
- r->block_length[l] = k - r->block_offset[l];
-
- return r;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_free_job
- *
- * Description : Frees the memory used by a pcrs_job struct and its
- * dependant structures.
- *
- * Parameters :
- * 1 : job = pointer to the pcrs_job structure to be freed
- *
- * Returns : a pointer to the next job, if there was any, or
- * NULL otherwise.
- *
- *********************************************************************/
-pcrs_job *pcrs_free_job(pcrs_job *job)
-{
- pcrs_job *next;
-
- if (job == NULL)
- {
- return NULL;
- }
- else
- {
- next = job->next;
- if (job->pattern != NULL) free(job->pattern);
- if (job->hints != NULL) free(job->hints);
- if (job->substitute != NULL)
- {
- if (job->substitute->text != NULL) free(job->substitute->text);
- free(job->substitute);
- }
- free(job);
- }
- return next;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_free_joblist
- *
- * Description : Iterates through a chained list of pcrs_job's and
- * frees them using pcrs_free_job.
- *
- * Parameters :
- * 1 : joblist = pointer to the first pcrs_job structure to
- * be freed
- *
- * Returns : N/A
- *
- *********************************************************************/
-void pcrs_free_joblist(pcrs_job *joblist)
-{
- while ( NULL != (joblist = pcrs_free_job(joblist)) ) {};
-
- return;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_compile_command
- *
- * Description : Parses a string with a Perl-style s/// command,
- * calls pcrs_compile, and returns a corresponding
- * pcrs_job, or NULL if parsing or compiling the job
- * fails.
- *
- * Parameters :
- * 1 : command = string with perl-style s/// command
- * 2 : errptr = pointer to an integer in which error
- * conditions can be returned.
- *
- * Returns : a corresponding pcrs_job data structure, or NULL
- * if an error was encountered. In that case, *errptr
- * has the reason.
- *
- *********************************************************************/
-pcrs_job *pcrs_compile_command(const char *command, int *errptr)
-{
- int i, k, l, quoted = FALSE;
- size_t limit;
- char delimiter;
- char *tokens[4];
- pcrs_job *newjob;
-
- i = k = l = 0;
-
- /*
- * Tokenize the perl command
- */
- limit = strlen(command);
- if (limit < 4)
- {
- *errptr = PCRS_ERR_CMDSYNTAX;
- return NULL;
- }
- else
- {
- delimiter = command[1];
- }
-
- tokens[l] = (char *) malloc(limit + 1);
-
- for (i = 0; i <= (int)limit; i++)
- {
-
- if (command[i] == delimiter && !quoted)
- {
- if (l == 3)
- {
- l = -1;
- break;
- }
- tokens[0][k++] = '\0';
- tokens[++l] = tokens[0] + k;
- continue;
- }
-
- else if (command[i] == '\\' && !quoted)
- {
- quoted = TRUE;
- if (command[i+1] == delimiter) continue;
- }
- else
- {
- quoted = FALSE;
- }
- tokens[0][k++] = command[i];
- }
-
- /*
- * Syntax error ?
- */
- if (l != 3)
- {
- *errptr = PCRS_ERR_CMDSYNTAX;
- free(tokens[0]);
- return NULL;
- }
-
- newjob = pcrs_compile(tokens[1], tokens[2], tokens[3], errptr);
- free(tokens[0]);
- return newjob;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_compile
- *
- * Description : Takes the three arguments to a perl s/// command
- * and compiles a pcrs_job structure from them.
- *
- * Parameters :
- * 1 : pattern = string with perl-style pattern
- * 2 : substitute = string with perl-style substitute
- * 3 : options = string with perl-style options
- * 4 : errptr = pointer to an integer in which error
- * conditions can be returned.
- *
- * Returns : a corresponding pcrs_job data structure, or NULL
- * if an error was encountered. In that case, *errptr
- * has the reason.
- *
- *********************************************************************/
-pcrs_job *pcrs_compile(const char *pattern, const char *substitute, const char *options, int *errptr)
-{
- pcrs_job *newjob;
- int flags;
- int capturecount;
- const char *error;
-
- *errptr = 0;
-
- /*
- * Handle NULL arguments
- */
- if (pattern == NULL) pattern = "";
- if (substitute == NULL) substitute = "";
-
-
- /*
- * Get and init memory
- */
- if (NULL == (newjob = (pcrs_job *)malloc(sizeof(pcrs_job))))
- {
- *errptr = PCRS_ERR_NOMEM;
- return NULL;
- }
- memset(newjob, '\0', sizeof(pcrs_job));
-
-
- /*
- * Evaluate the options
- */
- newjob->options = pcrs_parse_perl_options(options, &flags);
- newjob->flags = flags;
-
-
- /*
- * Compile the pattern
- */
- newjob->pattern = pcre_compile(pattern, newjob->options, &error, errptr, NULL);
- if (newjob->pattern == NULL)
- {
- pcrs_free_job(newjob);
- return NULL;
- }
-
-
- /*
- * Generate hints. This has little overhead, since the
- * hints will be NULL for a boring pattern anyway.
- */
- newjob->hints = pcre_study(newjob->pattern, 0, &error);
- if (error != NULL)
- {
- *errptr = PCRS_ERR_STUDY;
- pcrs_free_job(newjob);
- return NULL;
- }
-
-
- /*
- * Determine the number of capturing subpatterns.
- * This is needed for handling $+ in the substitute.
- */
- if (0 > (*errptr = pcre_fullinfo(newjob->pattern, newjob->hints, PCRE_INFO_CAPTURECOUNT, &capturecount)))
- {
- pcrs_free_job(newjob);
- return NULL;
- }
-
-
- /*
- * Compile the substitute
- */
- if (NULL == (newjob->substitute = pcrs_compile_replacement(substitute, newjob->flags & PCRS_TRIVIAL, capturecount, errptr)))
- {
- pcrs_free_job(newjob);
- return NULL;
- }
-
- return newjob;
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_execute_list
- *
- * Description : This is a multiple job wrapper for pcrs_execute().
- * Apply the regular substitutions defined by the jobs in
- * the joblist to the subject.
- * The subject itself is left untouched, memory for the result
- * is malloc()ed and it is the caller's responsibility to free
- * the result when it's no longer needed.
- *
- * Parameters :
- * 1 : joblist = the chained list of pcrs_jobs to be executed
- * 2 : subject = the subject string
- * 3 : subject_length = the subject's length
- * INCLUDING the terminating zero, if string!
- * 4 : result = char** for returning the result
- * 5 : result_length = size_t* for returning the result's length
- *
- * Returns : On success, the number of substitutions that were made.
- * May be > 1 if job->flags contained PCRS_GLOBAL
- * On failure, the (negative) pcre error code describing the
- * failure, which may be translated to text using pcrs_strerror().
- *
- *********************************************************************/
-int pcrs_execute_list(pcrs_job *joblist, char *subject, size_t subject_length, char **result, size_t *result_length)
-{
- pcrs_job *job;
- char *old_item, *new_item;
- int hits, total_hits;
-
- old_item = subject;
- *result_length = subject_length;
- hits = total_hits = 0;
-
- for (job = joblist; job != NULL; job = job->next)
- {
- hits = pcrs_execute(job, old_item, *result_length, &new_item, result_length);
-
- if (old_item != subject) free(old_item);
-
- if (hits < 0)
- {
- return(hits);
- }
- else
- {
- total_hits += hits;
- old_item = new_item;
- }
- }
-
- *result = new_item;
- return(total_hits);
-
-}
-
-
-/*********************************************************************
- *
- * Function : pcrs_execute
- *
- * Description : Apply the regular substitution defined by the job to the
- * subject.
- * The subject itself is left untouched, memory for the result
- * is malloc()ed and it is the caller's responsibility to free
- * the result when it's no longer needed.
- *
- * Parameters :
- * 1 : job = the pcrs_job to be executed
- * 2 : subject = the subject (== original) string
- * 3 : subject_length = the subject's length
- * INCLUDING the terminating zero, if string!
- * 4 : result = char** for returning the result
- * 5 : result_length = size_t* for returning the result's length
- *
- * Returns : On success, the number of substitutions that were made.
- * May be > 1 if job->flags contained PCRS_GLOBAL
- * On failure, the (negative) pcre error code describing the
- * failure, which may be translated to text using pcrs_strerror().
- *
- *********************************************************************/
-int pcrs_execute(pcrs_job *job, char *subject, size_t subject_length, char **result, size_t *result_length)
-{
- int offsets[3 * PCRS_MAX_SUBMATCHES],
- offset,
- i, k,
- matches_found,
- submatches,
- max_matches = PCRS_MAX_MATCH_INIT;
- size_t newsize;
- pcrs_match *matches, *dummy;
- char *result_offset;
-
- offset = i = k = 0;
-
- /*
- * Sanity check & memory allocation
- */
- if (job == NULL || job->pattern == NULL || job->substitute == NULL)
- {
- *result = NULL;
- return(PCRS_ERR_BADJOB);
- }
-
- if (NULL == (matches = (pcrs_match *)malloc(max_matches * sizeof(pcrs_match))))
- {
- *result = NULL;
- return(PCRS_ERR_NOMEM);
- }
- memset(matches, '\0', max_matches * sizeof(pcrs_match));
-
-
- /*
- * Find the pattern and calculate the space
- * requirements for the result
- */
- newsize = subject_length;
-
- while ((submatches = pcre_exec(job->pattern, job->hints, subject, (int)subject_length, offset, 0, offsets, 3 * PCRS_MAX_SUBMATCHES)) > 0)
- {
- job->flags |= PCRS_SUCCESS;
- matches[i].submatches = submatches;
-
- for (k = 0; k < submatches; k++)
- {
- matches[i].submatch_offset[k] = offsets[2 * k];
-
- /* Note: Non-found optional submatches have length -1-(-1)==0 */
- matches[i].submatch_length[k] = offsets[2 * k + 1] - offsets[2 * k];
-
- /* reserve mem for each submatch as often as it is ref'd */
- newsize += matches[i].submatch_length[k] * job->substitute->backref_count[k];
- }
- /* plus replacement text size minus match text size */
- newsize += strlen(job->substitute->text) - matches[i].submatch_length[0];
-
- /* chunk before match */
- matches[i].submatch_offset[PCRS_MAX_SUBMATCHES] = 0;
- matches[i].submatch_length[PCRS_MAX_SUBMATCHES] = offsets[0];
- newsize += offsets[0] * job->substitute->backref_count[PCRS_MAX_SUBMATCHES];
-
- /* chunk after match */
- matches[i].submatch_offset[PCRS_MAX_SUBMATCHES + 1] = offsets[1];
- matches[i].submatch_length[PCRS_MAX_SUBMATCHES + 1] = subject_length - offsets[1] - 1;
- newsize += (subject_length - offsets[1]) * job->substitute->backref_count[PCRS_MAX_SUBMATCHES + 1];
-
- /* Storage for matches exhausted? -> Extend! */
- if (++i >= max_matches)
- {
- max_matches = (int)(max_matches * PCRS_MAX_MATCH_GROW);
- if (NULL == (dummy = (pcrs_match *)realloc(matches, max_matches * sizeof(pcrs_match))))
- {
- free(matches);
- *result = NULL;
- return(PCRS_ERR_NOMEM);
- }
- matches = dummy;
- }
-
- /* Non-global search or limit reached? */
- if (!(job->flags & PCRS_GLOBAL)) break;
-
- /* Don't loop on empty matches */
- if (offsets[1] == offset)
- if ((size_t)offset < subject_length)
- offset++;
- else
- break;
- /* Go find the next one */
- else
- offset = offsets[1];
- }
- /* Pass pcre error through if (bad) failure */
- if (submatches < PCRE_ERROR_NOMATCH)
- {
- free(matches);
- return submatches;
- }
- matches_found = i;
-
-
- /*
- * Get memory for the result
- */
- if ((*result = (char *)malloc(newsize)) == NULL) /* must be free()d by caller */
- {
- free(matches);
- return PCRS_ERR_NOMEM;
- }
-
-
- /*
- * Replace
- */
- offset = 0;
- result_offset = *result;
-
- for (i = 0; i < matches_found; i++)
- {
- /* copy the chunk preceding the match */
- memcpy(result_offset, subject + offset, (size_t)matches[i].submatch_offset[0] - offset);
- result_offset += matches[i].submatch_offset[0] - offset;
-
- /* For every segment of the substitute.. */
- for (k = 0; k <= job->substitute->backrefs; k++)
- {
- /* ...copy its text.. */
- memcpy(result_offset, job->substitute->text + job->substitute->block_offset[k], job->substitute->block_length[k]);
- result_offset += job->substitute->block_length[k];
-
- /* ..plus, if it's not the last chunk, i.e.: There *is* a backref.. */
- if (k != job->substitute->backrefs
- /* ..in legal range.. */
- && job->substitute->backref[k] < PCRS_MAX_SUBMATCHES + 2
- /* ..and referencing a real submatch.. */
- && job->substitute->backref[k] < matches[i].submatches
- /* ..that is nonempty.. */
- && matches[i].submatch_length[job->substitute->backref[k]] > 0)
- {
- /* ..copy the submatch that is ref'd. */
- memcpy(
- result_offset,
- subject + matches[i].submatch_offset[job->substitute->backref[k]],
- matches[i].submatch_length[job->substitute->backref[k]]
- );
- result_offset += matches[i].submatch_length[job->substitute->backref[k]];
- }
- }
- offset = matches[i].submatch_offset[0] + matches[i].submatch_length[0];
- }
-
- /* Copy the rest. */
- memcpy(result_offset, subject + offset, subject_length - offset);
-
- *result_length = newsize;
- free(matches);
- return matches_found;
-
-}
-
-
-/*
- Local Variables:
- tab-width: 3
- end:
-*/
projects / privoxy.git / blobdiff