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pcrs.c
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/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/pcrs.c,v $
*
* Purpose : pcrs is a supplement to the pcre library by Philip Hazel
* <[email protected]> and adds Perl-style substitution. That
* is, it mimics Perl's 's' operator. See pcrs(3) for details.
*
* WARNING: This file contains additional functions and bug
* fixes that aren't part of the latest official pcrs package
* (which apparently is no longer maintained).
*
* Copyright : Written and Copyright (C) 2000, 2001 by Andreas S. Oesterhelt
*
* Copyright (C) 2006, 2007 Fabian Keil <[email protected]>
*
* 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.
*
*********************************************************************/
#include <string.h>
#include <ctype.h>
#include <assert.h>
/*
* Include project.h just so that the right pcre.h gets
* included from there
*/
#include "project.h"
/* For snprintf only */
#include "miscutil.h"
/* For xtoi */
#include "encode.h"
#include "pcrs.h"
/*
* 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);
static int is_hex_sequence(const char *sequence);
/*********************************************************************
*
* 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)
{
static char buf[100];
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";
#ifdef PCRE_ERROR_MATCHLIMIT
/*
* Only reported by PCRE versions newer than our own.
*/
case PCRE_ERROR_MATCHLIMIT: return "(pcre:) Match limit reached";
#endif /* def PCRE_ERROR_MATCHLIMIT */
/* 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";
case PCRS_WARN_TRUNCATION:
return "(pcrs:) At least one variable was too big and has been truncated before compilation";
/*
* XXX: With the exception of PCRE_ERROR_MATCHLIMIT we
* only catch PCRE errors that can happen with our internal
* version. If Privoxy is linked against a newer
* PCRE version all bets are off ...
*/
default:
snprintf(buf, sizeof(buf),
"Error code %d. For details, check the pcre documentation.",
error);
return buf;
}
}
/* 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;
}
#ifdef FUZZ
/*********************************************************************
*
* Function : pcrs_compile_fuzzed_replacement
*
* Description : Wrapper around pcrs_compile_replacement() for
* fuzzing purposes.
*
* Parameters :
* 1 : replacement = replacement part of s/// operator
* in perl syntax
* 2 : 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.
*
*********************************************************************/
extern pcrs_substitute *pcrs_compile_fuzzed_replacement(const char *replacement, int *errptr)
{
int capturecount = PCRS_MAX_SUBMATCHES; /* XXX: fuzzworthy? */
int trivial_flag = 0; /* We don't want to fuzz strncpy() */
*errptr = 0; /* XXX: Should pcrs_compile_replacement() do this? */
return pcrs_compile_replacement(replacement, trivial_flag, capturecount, errptr);
}
#endif
/*********************************************************************
*
* 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;
char *text;
pcrs_substitute *r;
#ifndef FUZZ
size_t length;
#else
static size_t length;
#endif
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 = (int)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 if (is_hex_sequence(&replacement[i]))
{
/*
* Replace a hex sequence with a single
* character with the sequence's ascii value.
* e.g.: '\x7e' => '~'
*/
const int ascii_value = xtoi(&replacement[i+2]);
assert(ascii_value >= 0);
assert(ascii_value < 256);
text[k++] = (char)ascii_value;
i += 4;
}
else
{
quoted = 1;
i++;
}
}
continue;
}
/* Backreferences */
if (replacement[i] == '$' && !quoted && i < (int)(length - 1))
{
char *symbol, symbols[] = "'`+&";
if (l >= PCRS_MAX_SUBMATCHES)
{
freez(text);
freez(r);
*errptr = PCRS_WARN_BADREF;
return NULL;
}
r->block_length[l] = (size_t)(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)
{
freez(text);
freez(r);
*errptr = PCRS_WARN_BADREF;
return NULL;
}
}
/* 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 $` */
{
r->backref[l] = (int)(PCRS_MAX_SUBMATCHES + 1 - (symbol - symbols));
}
i += 2;
}
/* Invalid backref -> plain '$' */
else
{
goto plainchar;
}
assert(r->backref[l] < PCRS_MAX_SUBMATCHES + 2);
/* Valid and in range? -> record */
if ((0 <= r->backref[l]) &&
(r->backref[l] < PCRS_MAX_SUBMATCHES + 2) &&
(l < PCRS_MAX_SUBMATCHES - 1))
{
r->backref_count[r->backref[l]] += 1;
r->block_offset[++l] = k;
}
else
{
freez(text);
freez(r);
*errptr = PCRS_WARN_BADREF;
return NULL;
}
continue;
}
plainchar:
/* Plain chars are copied */
text[k++] = replacement[i++];
quoted = 0;
}
} /* -END- if (!trivialflag) */
/*
* Finish & return
*/
r->text = text;
r->backrefs = l;
r->length = (size_t)k;
r->block_length[l] = (size_t)(k - r->block_offset[l]);
return r;
}
/*********************************************************************
*
* Function : pcrs_free_job
*
* Description : Frees the memory used by a pcrs_job struct and its
* dependent 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;
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.
*
* Note: For convenient string handling, a null byte is
* appended to the result. It does not count towards the
* result_length, though.
*
*
* Parameters :
* 1 : joblist = the chained list of pcrs_jobs to be executed
* 2 : subject = the subject string
* 3 : subject_length = the subject's length
* 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, *new = NULL;
int hits, total_hits;
old = subject;
*result_length = subject_length;
total_hits = 0;
for (job = joblist; job != NULL; job = job->next)
{
hits = pcrs_execute(job, old, *result_length, &new, result_length);
if (old != subject) free(old);
if (hits < 0)
{
return(hits);
}
else
{
total_hits += hits;
old = new;
}
}
*result = new;
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.
*
* Note: For convenient string handling, a null byte is
* appended to the result. It does not count towards the
* result_length, though.
*
* Parameters :
* 1 : job = the pcrs_job to be executed
* 2 : subject = the subject (== original) string
* 3 : subject_length = the subject's length
* 4 : result = char** for returning the result (NULL on error)
* 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, const 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 = 0;
*result = NULL;
/*
* Sanity check & memory allocation
*/
if (job == NULL || job->pattern == NULL || job->substitute == NULL || NULL == subject)
{
return(PCRS_ERR_BADJOB);
}
if (NULL == (matches = (pcrs_match *)malloc((size_t)max_matches * sizeof(pcrs_match))))
{
return(PCRS_ERR_NOMEM);
}
memset(matches, '\0', (size_t)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] = (size_t)(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] * (size_t)job->substitute->backref_count[k];
}
/* plus replacement text size minus match text size */
newsize += job->substitute->length - matches[i].submatch_length[0];
/* chunk before match */
matches[i].submatch_offset[PCRS_MAX_SUBMATCHES] = 0;
matches[i].submatch_length[PCRS_MAX_SUBMATCHES] = (size_t)offsets[0];
newsize += (size_t)offsets[0] * (size_t)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 - (size_t)offsets[1] - 1;
newsize += (subject_length - (size_t)offsets[1]) * (size_t)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, (size_t)max_matches * sizeof(pcrs_match))))
{
free(matches);
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 (must be freed by caller!)
* and append terminating null byte.
*/
if ((*result = (char *)malloc(newsize + 1)) == NULL)
{
free(matches);
return PCRS_ERR_NOMEM;
}
else
{
(*result)[newsize] = '\0';
}
/*
* 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] + (int)matches[i].submatch_length[0];
}
/* Copy the rest. */
memcpy(result_offset, subject + offset, subject_length - (size_t)offset);
*result_length = newsize;
free(matches);
return matches_found;
}
#define is_hex_digit(x) ((x) && strchr("0123456789ABCDEF", toupper(x)))
/*********************************************************************
*
* Function : is_hex_sequence
*
* Description : Checks the first four characters of a string
* and decides if they are a valid hex sequence
* (like '\x40').
*
* Parameters :
* 1 : sequence = The string to check
*
* Returns : Non-zero if it's valid sequence, or
* Zero if it isn't.
*
*********************************************************************/
static int is_hex_sequence(const char *sequence)
{
return (sequence[0] == '\\' &&
sequence[1] == 'x' &&
is_hex_digit(sequence[2]) &&
is_hex_digit(sequence[3]));
}
/*
* Functions below this line are only part of the pcrs version
* included in Privoxy. If you use any of them you should not
* try to dynamically link against external pcrs versions.
*/
/*********************************************************************
*
* Function : pcrs_job_is_dynamic
*
* Description : Checks if a job has the "D" (dynamic) option set.
*
* Parameters :
* 1 : job = The job to check
*
* Returns : TRUE if the job is indeed dynamic, otherwise
* FALSE
*
*********************************************************************/
int pcrs_job_is_dynamic (char *job)
{