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/*
* Copyright (C) 1984-2012 Mark Nudelman
* Modified for use with illumos by Garrett D'Amore.
* Copyright 2014 Garrett D'Amore <garrett@damore.org>
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
/*
* Routines to do pattern matching.
*/
#include "less.h"
#include "pattern.h"
extern int caseless;
extern int less_is_more;
/*
* Compile a search pattern, for future use by match_pattern.
*/
static int
compile_pattern2(char *pattern, int search_type, regex_t **comp_pattern)
{
regex_t *comp;
if (search_type & SRCH_NO_REGEX)
return (0);
comp = ecalloc(1, sizeof (regex_t));
if (regcomp(comp, pattern, less_is_more ? 0 : REGCOMP_FLAG)) {
free(comp);
error("Invalid pattern", NULL);
return (-1);
}
if (*comp_pattern != NULL)
regfree(*comp_pattern);
*comp_pattern = comp;
return (0);
}
/*
* Like compile_pattern2, but convert the pattern to lowercase if necessary.
*/
int
compile_pattern(char *pattern, int search_type, regex_t **comp_pattern)
{
char *cvt_pattern;
int result;
if (caseless != OPT_ONPLUS) {
cvt_pattern = pattern;
} else {
cvt_pattern = ecalloc(1, cvt_length(strlen(pattern)));
cvt_text(cvt_pattern, pattern, NULL, NULL, CVT_TO_LC);
}
result = compile_pattern2(cvt_pattern, search_type, comp_pattern);
if (cvt_pattern != pattern)
free(cvt_pattern);
return (result);
}
/*
* Forget that we have a compiled pattern.
*/
void
uncompile_pattern(regex_t **pattern)
{
if (*pattern != NULL)
regfree(*pattern);
*pattern = NULL;
}
/*
* Simple pattern matching function.
* It supports no metacharacters like *, etc.
*/
static int
match(char *pattern, int pattern_len, char *buf, int buf_len,
char **pfound, char **pend)
{
char *pp, *lp;
char *pattern_end = pattern + pattern_len;
char *buf_end = buf + buf_len;
for (; buf < buf_end; buf++) {
for (pp = pattern, lp = buf; *pp == *lp; pp++, lp++)
if (pp == pattern_end || lp == buf_end)
break;
if (pp == pattern_end) {
if (pfound != NULL)
*pfound = buf;
if (pend != NULL)
*pend = lp;
return (1);
}
}
return (0);
}
/*
* Perform a pattern match with the previously compiled pattern.
* Set sp and ep to the start and end of the matched string.
*/
int
match_pattern(void *pattern, char *tpattern, char *line, int line_len,
char **sp, char **ep, int notbol, int search_type)
{
int matched;
regex_t *spattern = (regex_t *)pattern;
if (search_type & SRCH_NO_REGEX) {
matched = match(tpattern, strlen(tpattern), line, line_len,
sp, ep);
} else {
regmatch_t rm;
int flags = (notbol) ? REG_NOTBOL : 0;
#ifdef REG_STARTEND
flags |= REG_STARTEND;
rm.rm_so = 0;
rm.rm_eo = line_len;
#endif
*sp = NULL;
*ep = NULL;
matched = !regexec(spattern, line, 1, &rm, flags);
if (matched) {
*sp = line + rm.rm_so;
*ep = line + rm.rm_eo;
}
}
matched = (!(search_type & SRCH_NO_MATCH) && matched) ||
((search_type & SRCH_NO_MATCH) && !matched);
return (matched);
}
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