1 const char pcrs_rcs[] = "$Id: pcrs.c,v 1.35 2009/08/19 15:28:08 fabiankeil Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/pcrs.c,v $
6 * Purpose : pcrs is a supplement to the pcre library by Philip Hazel
7 * <ph10@cam.ac.uk> and adds Perl-style substitution. That
8 * is, it mimics Perl's 's' operator. See pcrs(3) for details.
10 * WARNING: This file contains additional functions and bug
11 * fixes that aren't part of the latest official pcrs package
12 * (which apparently is no longer maintained).
14 * Copyright : Written and Copyright (C) 2000, 2001 by Andreas S. Oesterhelt
15 * <andreas@oesterhelt.org>
17 * Copyright (C) 2006, 2007 Fabian Keil <fk@fabiankeil.de>
19 * This program is free software; you can redistribute it
20 * and/or modify it under the terms of the GNU Lesser
21 * General Public License (LGPL), version 2.1, which should
22 * be included in this distribution (see LICENSE.txt), with
23 * the exception that the permission to replace that license
24 * with the GNU General Public License (GPL) given in section
25 * 3 is restricted to version 2 of the GPL.
27 * This program is distributed in the hope that it will
28 * be useful, but WITHOUT ANY WARRANTY; without even the
29 * implied warranty of MERCHANTABILITY or FITNESS FOR A
30 * PARTICULAR PURPOSE. See the license for more details.
32 * The GNU Lesser General Public License should be included
33 * with this file. If not, you can view it at
34 * http://www.gnu.org/licenses/lgpl.html
35 * or write to the Free Software Foundation, Inc., 59
36 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 *********************************************************************/
46 * Include project.h just so that the right pcre.h gets
51 /* For snprintf only */
58 const char pcrs_h_rcs[] = PCRS_H_VERSION;
64 static int pcrs_parse_perl_options(const char *optstring, int *flags);
65 static pcrs_substitute *pcrs_compile_replacement(const char *replacement, int trivialflag,
66 int capturecount, int *errptr);
67 static int is_hex_sequence(const char *sequence);
69 /*********************************************************************
71 * Function : pcrs_strerror
73 * Description : Return a string describing a given error code.
76 * 1 : error = the error code
78 * Returns : char * to the descriptive string
80 *********************************************************************/
81 const char *pcrs_strerror(const int error)
87 /* Passed-through PCRE error: */
88 case PCRE_ERROR_NOMEMORY: return "(pcre:) No memory";
90 /* Shouldn't happen unless PCRE or PCRS bug, or user messed with compiled job: */
91 case PCRE_ERROR_NULL: return "(pcre:) NULL code or subject or ovector";
92 case PCRE_ERROR_BADOPTION: return "(pcre:) Unrecognized option bit";
93 case PCRE_ERROR_BADMAGIC: return "(pcre:) Bad magic number in code";
94 case PCRE_ERROR_UNKNOWN_NODE: return "(pcre:) Bad node in pattern";
96 /* Can't happen / not passed: */
97 case PCRE_ERROR_NOSUBSTRING: return "(pcre:) Fire in power supply";
98 case PCRE_ERROR_NOMATCH: return "(pcre:) Water in power supply";
100 #ifdef PCRE_ERROR_MATCHLIMIT
102 * Only reported by PCRE versions newer than our own.
104 case PCRE_ERROR_MATCHLIMIT: return "(pcre:) Match limit reached";
105 #endif /* def PCRE_ERROR_MATCHLIMIT */
108 case PCRS_ERR_NOMEM: return "(pcrs:) No memory";
109 case PCRS_ERR_CMDSYNTAX: return "(pcrs:) Syntax error while parsing command";
110 case PCRS_ERR_STUDY: return "(pcrs:) PCRE error while studying the pattern";
111 case PCRS_ERR_BADJOB: return "(pcrs:) Bad job - NULL job, pattern or substitute";
112 case PCRS_WARN_BADREF: return "(pcrs:) Backreference out of range";
113 case PCRS_WARN_TRUNCATION:
114 return "(pcrs:) At least one variable was too big and has been truncated before compilation";
117 * XXX: With the exception of PCRE_ERROR_MATCHLIMIT we
118 * only catch PCRE errors that can happen with our internal
119 * version. If Privoxy is linked against a newer
120 * PCRE version all bets are off ...
122 default: return "Unknown error. Privoxy out of sync with PCRE?";
125 /* error >= 0: No error */
126 return "(pcrs:) Everything's just fine. Thanks for asking.";
131 /*********************************************************************
133 * Function : pcrs_parse_perl_options
135 * Description : This function parses a string containing the options to
136 * Perl's s/// operator. It returns an integer that is the
137 * pcre equivalent of the symbolic optstring.
138 * Since pcre doesn't know about Perl's 'g' (global) or pcrs',
139 * 'T' (trivial) options but pcrs needs them, the corresponding
140 * flags are set if 'g'or 'T' is encountered.
141 * Note: The 'T' and 'U' options do not conform to Perl.
144 * 1 : optstring = string with options in perl syntax
145 * 2 : flags = see description
147 * Returns : option integer suitable for pcre
149 *********************************************************************/
150 static int pcrs_parse_perl_options(const char *optstring, int *flags)
156 if (NULL == optstring) return 0;
158 for (i = 0; i < strlen(optstring); i++)
162 case 'e': break; /* ToDo ;-) */
163 case 'g': *flags |= PCRS_GLOBAL; break;
164 case 'i': rc |= PCRE_CASELESS; break;
165 case 'm': rc |= PCRE_MULTILINE; break;
167 case 's': rc |= PCRE_DOTALL; break;
168 case 'x': rc |= PCRE_EXTENDED; break;
169 case 'U': rc |= PCRE_UNGREEDY; break;
170 case 'T': *flags |= PCRS_TRIVIAL; break;
179 /*********************************************************************
181 * Function : pcrs_compile_replacement
183 * Description : This function takes a Perl-style replacement (2nd argument
184 * to the s/// operator and returns a compiled pcrs_substitute,
185 * or NULL if memory allocation for the substitute structure
189 * 1 : replacement = replacement part of s/// operator
191 * 2 : trivialflag = Flag that causes backreferences to be
193 * 3 : capturecount = Number of capturing subpatterns in
194 * the pattern. Needed for $+ handling.
195 * 4 : errptr = pointer to an integer in which error
196 * conditions can be returned.
198 * Returns : pcrs_substitute data structure, or NULL if an
199 * error is encountered. In that case, *errptr has
202 *********************************************************************/
203 static pcrs_substitute *pcrs_compile_replacement(const char *replacement, int trivialflag, int capturecount, int *errptr)
210 i = k = l = quoted = 0;
215 if (NULL == replacement)
223 if (NULL == (r = (pcrs_substitute *)malloc(sizeof(pcrs_substitute))))
225 *errptr = PCRS_ERR_NOMEM;
228 memset(r, '\0', sizeof(pcrs_substitute));
230 length = strlen(replacement);
232 if (NULL == (text = (char *)malloc(length + 1)))
235 *errptr = PCRS_ERR_NOMEM;
238 memset(text, '\0', length + 1);
242 * In trivial mode, just copy the substitute text
246 text = strncpy(text, replacement, length + 1);
251 * Else, parse, cut out and record all backreferences
255 while (i < (int)length)
258 if (replacement[i] == '\\')
262 text[k++] = replacement[i++];
267 if (replacement[i+1] && strchr("tnrfae0", replacement[i+1]))
269 switch (replacement[++i])
295 else if (is_hex_sequence(&replacement[i]))
298 * Replace a hex sequence with a single
299 * character with the sequence's ascii value.
300 * e.g.: '\x7e' => '~'
302 const int ascii_value = xtoi(&replacement[i+2]);
304 assert(ascii_value > 0);
305 assert(ascii_value < 256);
306 text[k++] = (char)ascii_value;
319 if (replacement[i] == '$' && !quoted && i < (int)(length - 1))
321 char *symbol, symbols[] = "'`+&";
322 r->block_length[l] = (size_t)(k - r->block_offset[l]);
324 /* Numerical backreferences */
325 if (isdigit((int)replacement[i + 1]))
327 while (i < (int)length && isdigit((int)replacement[++i]))
329 r->backref[l] = r->backref[l] * 10 + replacement[i] - 48;
331 if (r->backref[l] > capturecount)
333 *errptr = PCRS_WARN_BADREF;
337 /* Symbolic backreferences: */
338 else if (NULL != (symbol = strchr(symbols, replacement[i + 1])))
341 if (symbol - symbols == 2) /* $+ */
343 r->backref[l] = capturecount;
345 else if (symbol - symbols == 3) /* $& */
351 r->backref[l] = (int)(PCRS_MAX_SUBMATCHES + 1 - (symbol - symbols));
356 /* Invalid backref -> plain '$' */
362 /* Valid and in range? -> record */
363 if (r->backref[l] < PCRS_MAX_SUBMATCHES + 2)
365 r->backref_count[r->backref[l]] += 1;
366 r->block_offset[++l] = k;
370 *errptr = PCRS_WARN_BADREF;
376 /* Plain chars are copied */
377 text[k++] = replacement[i++];
380 } /* -END- if (!trivialflag) */
387 r->length = (size_t)k;
388 r->block_length[l] = (size_t)(k - r->block_offset[l]);
395 /*********************************************************************
397 * Function : pcrs_free_job
399 * Description : Frees the memory used by a pcrs_job struct and its
400 * dependant structures.
403 * 1 : job = pointer to the pcrs_job structure to be freed
405 * Returns : a pointer to the next job, if there was any, or
408 *********************************************************************/
409 pcrs_job *pcrs_free_job(pcrs_job *job)
420 if (job->pattern != NULL) free(job->pattern);
421 if (job->hints != NULL) free(job->hints);
422 if (job->substitute != NULL)
424 if (job->substitute->text != NULL) free(job->substitute->text);
425 free(job->substitute);
434 /*********************************************************************
436 * Function : pcrs_free_joblist
438 * Description : Iterates through a chained list of pcrs_job's and
439 * frees them using pcrs_free_job.
442 * 1 : joblist = pointer to the first pcrs_job structure to
447 *********************************************************************/
448 void pcrs_free_joblist(pcrs_job *joblist)
450 while ( NULL != (joblist = pcrs_free_job(joblist)) ) {};
457 /*********************************************************************
459 * Function : pcrs_compile_command
461 * Description : Parses a string with a Perl-style s/// command,
462 * calls pcrs_compile, and returns a corresponding
463 * pcrs_job, or NULL if parsing or compiling the job
467 * 1 : command = string with perl-style s/// command
468 * 2 : errptr = pointer to an integer in which error
469 * conditions can be returned.
471 * Returns : a corresponding pcrs_job data structure, or NULL
472 * if an error was encountered. In that case, *errptr
475 *********************************************************************/
476 pcrs_job *pcrs_compile_command(const char *command, int *errptr)
478 int i, k, l, quoted = FALSE;
487 * Tokenize the perl command
489 limit = strlen(command);
492 *errptr = PCRS_ERR_CMDSYNTAX;
497 delimiter = command[1];
500 tokens[l] = (char *) malloc(limit + 1);
502 for (i = 0; i <= (int)limit; i++)
505 if (command[i] == delimiter && !quoted)
512 tokens[0][k++] = '\0';
513 tokens[++l] = tokens[0] + k;
517 else if (command[i] == '\\' && !quoted)
520 if (command[i+1] == delimiter) continue;
526 tokens[0][k++] = command[i];
534 *errptr = PCRS_ERR_CMDSYNTAX;
539 newjob = pcrs_compile(tokens[1], tokens[2], tokens[3], errptr);
546 /*********************************************************************
548 * Function : pcrs_compile
550 * Description : Takes the three arguments to a perl s/// command
551 * and compiles a pcrs_job structure from them.
554 * 1 : pattern = string with perl-style pattern
555 * 2 : substitute = string with perl-style substitute
556 * 3 : options = string with perl-style options
557 * 4 : errptr = pointer to an integer in which error
558 * conditions can be returned.
560 * Returns : a corresponding pcrs_job data structure, or NULL
561 * if an error was encountered. In that case, *errptr
564 *********************************************************************/
565 pcrs_job *pcrs_compile(const char *pattern, const char *substitute, const char *options, int *errptr)
575 * Handle NULL arguments
577 if (pattern == NULL) pattern = "";
578 if (substitute == NULL) substitute = "";
582 * Get and init memory
584 if (NULL == (newjob = (pcrs_job *)malloc(sizeof(pcrs_job))))
586 *errptr = PCRS_ERR_NOMEM;
589 memset(newjob, '\0', sizeof(pcrs_job));
593 * Evaluate the options
595 newjob->options = pcrs_parse_perl_options(options, &flags);
596 newjob->flags = flags;
600 * Compile the pattern
602 newjob->pattern = pcre_compile(pattern, newjob->options, &error, errptr, NULL);
603 if (newjob->pattern == NULL)
605 pcrs_free_job(newjob);
611 * Generate hints. This has little overhead, since the
612 * hints will be NULL for a boring pattern anyway.
614 newjob->hints = pcre_study(newjob->pattern, 0, &error);
617 *errptr = PCRS_ERR_STUDY;
618 pcrs_free_job(newjob);
624 * Determine the number of capturing subpatterns.
625 * This is needed for handling $+ in the substitute.
627 if (0 > (*errptr = pcre_fullinfo(newjob->pattern, newjob->hints, PCRE_INFO_CAPTURECOUNT, &capturecount)))
629 pcrs_free_job(newjob);
635 * Compile the substitute
637 if (NULL == (newjob->substitute = pcrs_compile_replacement(substitute, newjob->flags & PCRS_TRIVIAL, capturecount, errptr)))
639 pcrs_free_job(newjob);
648 /*********************************************************************
650 * Function : pcrs_execute_list
652 * Description : This is a multiple job wrapper for pcrs_execute().
653 * Apply the regular substitutions defined by the jobs in
654 * the joblist to the subject.
655 * The subject itself is left untouched, memory for the result
656 * is malloc()ed and it is the caller's responsibility to free
657 * the result when it's no longer needed.
659 * Note: For convenient string handling, a null byte is
660 * appended to the result. It does not count towards the
661 * result_length, though.
665 * 1 : joblist = the chained list of pcrs_jobs to be executed
666 * 2 : subject = the subject string
667 * 3 : subject_length = the subject's length
668 * 4 : result = char** for returning the result
669 * 5 : result_length = size_t* for returning the result's length
671 * Returns : On success, the number of substitutions that were made.
672 * May be > 1 if job->flags contained PCRS_GLOBAL
673 * On failure, the (negative) pcre error code describing the
674 * failure, which may be translated to text using pcrs_strerror().
676 *********************************************************************/
677 int pcrs_execute_list(pcrs_job *joblist, char *subject, size_t subject_length, char **result, size_t *result_length)
680 char *old, *new = NULL;
681 int hits, total_hits;
684 *result_length = subject_length;
687 for (job = joblist; job != NULL; job = job->next)
689 hits = pcrs_execute(job, old, *result_length, &new, result_length);
691 if (old != subject) free(old);
710 /*********************************************************************
712 * Function : pcrs_execute
714 * Description : Apply the regular substitution defined by the job to the
716 * The subject itself is left untouched, memory for the result
717 * is malloc()ed and it is the caller's responsibility to free
718 * the result when it's no longer needed.
720 * Note: For convenient string handling, a null byte is
721 * appended to the result. It does not count towards the
722 * result_length, though.
725 * 1 : job = the pcrs_job to be executed
726 * 2 : subject = the subject (== original) string
727 * 3 : subject_length = the subject's length
728 * 4 : result = char** for returning the result
729 * 5 : result_length = size_t* for returning the result's length
731 * Returns : On success, the number of substitutions that were made.
732 * May be > 1 if job->flags contained PCRS_GLOBAL
733 * On failure, the (negative) pcre error code describing the
734 * failure, which may be translated to text using pcrs_strerror().
736 *********************************************************************/
737 int pcrs_execute(pcrs_job *job, const char *subject, size_t subject_length, char **result, size_t *result_length)
739 int offsets[3 * PCRS_MAX_SUBMATCHES],
744 max_matches = PCRS_MAX_MATCH_INIT;
746 pcrs_match *matches, *dummy;
752 * Sanity check & memory allocation
754 if (job == NULL || job->pattern == NULL || job->substitute == NULL || NULL == subject)
757 return(PCRS_ERR_BADJOB);
760 if (NULL == (matches = (pcrs_match *)malloc((size_t)max_matches * sizeof(pcrs_match))))
763 return(PCRS_ERR_NOMEM);
765 memset(matches, '\0', (size_t)max_matches * sizeof(pcrs_match));
769 * Find the pattern and calculate the space
770 * requirements for the result
772 newsize = subject_length;
774 while ((submatches = pcre_exec(job->pattern, job->hints, subject, (int)subject_length, offset, 0, offsets, 3 * PCRS_MAX_SUBMATCHES)) > 0)
776 job->flags |= PCRS_SUCCESS;
777 matches[i].submatches = submatches;
779 for (k = 0; k < submatches; k++)
781 matches[i].submatch_offset[k] = offsets[2 * k];
783 /* Note: Non-found optional submatches have length -1-(-1)==0 */
784 matches[i].submatch_length[k] = (size_t)(offsets[2 * k + 1] - offsets[2 * k]);
786 /* reserve mem for each submatch as often as it is ref'd */
787 newsize += matches[i].submatch_length[k] * (size_t)job->substitute->backref_count[k];
789 /* plus replacement text size minus match text size */
790 newsize += job->substitute->length - matches[i].submatch_length[0];
792 /* chunk before match */
793 matches[i].submatch_offset[PCRS_MAX_SUBMATCHES] = 0;
794 matches[i].submatch_length[PCRS_MAX_SUBMATCHES] = (size_t)offsets[0];
795 newsize += (size_t)offsets[0] * (size_t)job->substitute->backref_count[PCRS_MAX_SUBMATCHES];
797 /* chunk after match */
798 matches[i].submatch_offset[PCRS_MAX_SUBMATCHES + 1] = offsets[1];
799 matches[i].submatch_length[PCRS_MAX_SUBMATCHES + 1] = subject_length - (size_t)offsets[1] - 1;
800 newsize += (subject_length - (size_t)offsets[1]) * (size_t)job->substitute->backref_count[PCRS_MAX_SUBMATCHES + 1];
802 /* Storage for matches exhausted? -> Extend! */
803 if (++i >= max_matches)
805 max_matches = (int)(max_matches * PCRS_MAX_MATCH_GROW);
806 if (NULL == (dummy = (pcrs_match *)realloc(matches, (size_t)max_matches * sizeof(pcrs_match))))
810 return(PCRS_ERR_NOMEM);
815 /* Non-global search or limit reached? */
816 if (!(job->flags & PCRS_GLOBAL)) break;
818 /* Don't loop on empty matches */
819 if (offsets[1] == offset)
820 if ((size_t)offset < subject_length)
824 /* Go find the next one */
828 /* Pass pcre error through if (bad) failiure */
829 if (submatches < PCRE_ERROR_NOMATCH)
838 * Get memory for the result (must be freed by caller!)
839 * and append terminating null byte.
841 if ((*result = (char *)malloc(newsize + 1)) == NULL)
844 return PCRS_ERR_NOMEM;
848 (*result)[newsize] = '\0';
856 result_offset = *result;
858 for (i = 0; i < matches_found; i++)
860 /* copy the chunk preceding the match */
861 memcpy(result_offset, subject + offset, (size_t)(matches[i].submatch_offset[0] - offset));
862 result_offset += matches[i].submatch_offset[0] - offset;
864 /* For every segment of the substitute.. */
865 for (k = 0; k <= job->substitute->backrefs; k++)
867 /* ...copy its text.. */
868 memcpy(result_offset, job->substitute->text + job->substitute->block_offset[k], job->substitute->block_length[k]);
869 result_offset += job->substitute->block_length[k];
871 /* ..plus, if it's not the last chunk, i.e.: There *is* a backref.. */
872 if (k != job->substitute->backrefs
873 /* ..in legal range.. */
874 && job->substitute->backref[k] < PCRS_MAX_SUBMATCHES + 2
875 /* ..and referencing a real submatch.. */
876 && job->substitute->backref[k] < matches[i].submatches
877 /* ..that is nonempty.. */
878 && matches[i].submatch_length[job->substitute->backref[k]] > 0)
880 /* ..copy the submatch that is ref'd. */
883 subject + matches[i].submatch_offset[job->substitute->backref[k]],
884 matches[i].submatch_length[job->substitute->backref[k]]
886 result_offset += matches[i].submatch_length[job->substitute->backref[k]];
889 offset = matches[i].submatch_offset[0] + (int)matches[i].submatch_length[0];
893 memcpy(result_offset, subject + offset, subject_length - (size_t)offset);
895 *result_length = newsize;
897 return matches_found;
902 #define is_hex_digit(x) ((x) && strchr("0123456789ABCDEF", toupper(x)))
904 /*********************************************************************
906 * Function : is_hex_sequence
908 * Description : Checks the first four characters of a string
909 * and decides if they are a valid hex sequence
913 * 1 : sequence = The string to check
915 * Returns : Non-zero if it's valid sequence, or
918 *********************************************************************/
919 static int is_hex_sequence(const char *sequence)
921 return (sequence[0] == '\\' &&
922 sequence[1] == 'x' &&
923 is_hex_digit(sequence[2]) &&
924 is_hex_digit(sequence[3]));
929 * Functions below this line are only part of the pcrs version
930 * included in Privoxy. If you use any of them you should not
931 * try to dynamically link against external pcrs versions.
934 /*********************************************************************
936 * Function : pcrs_job_is_dynamic
938 * Description : Checks if a job has the "D" (dynamic) option set.
941 * 1 : job = The job to check
943 * Returns : TRUE if the job is indeed dynamic, otherwise
946 *********************************************************************/
947 int pcrs_job_is_dynamic (char *job)
949 const char delimiter = job[1];
950 const size_t length = strlen(job);
956 * The shortest valid (but useless)
957 * dynamic pattern is "s@@@D"
963 * Everything between the last character
964 * and the last delimiter is an option ...
966 for (option = job + length; *option != delimiter; option--)
971 * ... and if said option is 'D' the job is dynamic.
981 /*********************************************************************
983 * Function : pcrs_get_delimiter
985 * Description : Tries to find a character that is safe to
986 * be used as a pcrs delimiter for a certain string.
989 * 1 : string = The string to search in
991 * Returns : A safe delimiter if one was found, otherwise '\0'.
993 *********************************************************************/
994 char pcrs_get_delimiter(const char *string)
997 * Some characters that are unlikely to
998 * be part of pcrs replacement strings.
1000 char delimiters[] = "><§#+*~%^°-:;µ!@";
1001 char *d = delimiters;
1003 /* Take the first delimiter that isn't part of the string */
1004 while (*d && NULL != strchr(string, *d))
1013 /*********************************************************************
1015 * Function : pcrs_execute_single_command
1017 * Description : Apply single pcrs command to the subject.
1018 * The subject itself is left untouched, memory for the result
1019 * is malloc()ed and it is the caller's responsibility to free
1020 * the result when it's no longer needed.
1023 * 1 : subject = the subject (== original) string
1024 * 2 : pcrs_command = the pcrs command as string (s@foo@bar@)
1025 * 3 : hits = int* for returning the number of modifications
1027 * Returns : NULL in case of errors, otherwise the
1028 * result of the pcrs command.
1030 *********************************************************************/
1031 char *pcrs_execute_single_command(const char *subject, const char *pcrs_command, int *hits)
1034 char *result = NULL;
1038 assert(pcrs_command);
1041 size = strlen(subject);
1043 job = pcrs_compile_command(pcrs_command, hits);
1046 *hits = pcrs_execute(job, subject, size, &result, &size);
1058 static const char warning[] = "... [too long, truncated]";
1059 /*********************************************************************
1061 * Function : pcrs_compile_dynamic_command
1063 * Description : Takes a dynamic pcrs command, fills in the
1064 * values of the variables and compiles it.
1067 * 1 : pcrs_command = The dynamic pcrs command to compile
1068 * 2 : v = NULL terminated array of variables and their values.
1069 * 3 : error = pcrs error code
1071 * Returns : NULL in case of hard errors, otherwise the
1072 * compiled pcrs job.
1074 *********************************************************************/
1075 pcrs_job *pcrs_compile_dynamic_command(char *pcrs_command, const struct pcrs_variable v[], int *error)
1077 char buf[PCRS_BUFFER_SIZE];
1078 const char *original_pcrs_command = pcrs_command;
1079 char *pcrs_command_tmp = NULL;
1080 pcrs_job *job = NULL;
1085 while ((NULL != v->name) && (NULL != pcrs_command))
1087 assert(NULL != v->value);
1089 if (NULL == strstr(pcrs_command, v->name))
1092 * Skip the substitution if the variable
1093 * name isn't part of the pattern.
1099 /* Use pcrs to replace the variable with its value. */
1100 d = pcrs_get_delimiter(v->value);
1103 /* No proper delimiter found */
1104 *error = PCRS_ERR_CMDSYNTAX;
1109 * Variable names are supposed to contain alpha
1110 * numerical characters plus '_' only.
1112 assert(NULL == strchr(v->name, d));
1114 ret = snprintf(buf, sizeof(buf), "s%c\\$%s%c%s%cgT", d, v->name, d, v->value, d);
1116 if (ret >= sizeof(buf))
1119 * Value didn't completely fit into buffer,
1120 * overwrite the end of the substitution text
1121 * with a truncation message and close the pattern
1124 const size_t trailer_size = sizeof(warning) + 3; /* 3 for d + "gT" */
1125 char *trailer_start = buf + sizeof(buf) - trailer_size;
1127 ret = snprintf(trailer_start, trailer_size, "%s%cgT", warning, d);
1128 assert(ret == trailer_size - 1);
1129 assert(sizeof(buf) == strlen(buf) + 1);
1133 pcrs_command_tmp = pcrs_execute_single_command(pcrs_command, buf, error);
1134 if (NULL == pcrs_command_tmp)
1139 if (pcrs_command != original_pcrs_command)
1141 freez(pcrs_command);
1143 pcrs_command = pcrs_command_tmp;
1148 job = pcrs_compile_command(pcrs_command, error);
1149 if (pcrs_command != original_pcrs_command)
1151 freez(pcrs_command);
1156 *error = PCRS_WARN_TRUNCATION;