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/*
* regex.c
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 2007 Phil Pennock
* All Rights Reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Phil Pennock or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Phil Pennock and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Phil Pennock and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Phil Pennock and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "regex.mdh"
#include "regex.pro"
#include <regex.h>
/* we default to a vaguely modern syntax and set of capabilities */
#define ZREGEX_EXTENDED 0
/* if you want Basic syntax, make it an alternative options */
static void
zregex_regerrwarn(int r, regex_t *re, char *msg)
{
char *errbuf;
size_t errbufsz;
errbufsz = regerror(r, re, NULL, 0);
errbuf = zalloc(errbufsz*sizeof(char));
regerror(r, re, errbuf, errbufsz);
zwarn("%s: %s", msg, errbuf);
zfree(errbuf, errbufsz);
}
/**/
static int
zcond_regex_match(char **a, int id)
{
regex_t re;
regmatch_t *m, *matches = NULL;
size_t matchessz = 0;
char *lhstr, *rhre, *s, **arr, **x;
int r, n, return_value, rcflags, reflags, nelem, start;
lhstr = cond_str(a,0,0);
rhre = cond_str(a,1,0);
rcflags = reflags = 0;
return_value = 0; /* 1 => matched successfully */
switch(id) {
case ZREGEX_EXTENDED:
rcflags |= REG_EXTENDED;
if (!isset(CASEMATCH))
rcflags |= REG_ICASE;
r = regcomp(&re, rhre, rcflags);
if (r) {
zregex_regerrwarn(r, &re, "failed to compile regex");
break;
}
/* re.re_nsub is number of parenthesized groups, we also need
* 1 for the 0 offset, which is the entire matched portion
*/
if ((int)re.re_nsub < 0) {
zwarn("INTERNAL ERROR: regcomp() returned "
"negative subpattern count %d", (int)re.re_nsub);
break;
}
matchessz = (re.re_nsub + 1) * sizeof(regmatch_t);
matches = zalloc(matchessz);
r = regexec(&re, lhstr, re.re_nsub+1, matches, reflags);
if (r == REG_NOMATCH)
; /* We do nothing when we fail to match. */
else if (r == 0) {
return_value = 1;
if (isset(BASHREMATCH)) {
start = 0;
nelem = re.re_nsub + 1;
} else {
start = 1;
nelem = re.re_nsub;
}
arr = NULL; /* bogus gcc warning of used uninitialised */
/* entire matched portion + re_nsub substrings + NULL */
if (nelem) {
arr = x = (char **) zalloc(sizeof(char *) * (nelem + 1));
for (m = matches + start, n = start; n <= (int)re.re_nsub; ++n, ++m, ++x) {
*x = ztrduppfx(lhstr + m->rm_so, m->rm_eo - m->rm_so);
}
*x = NULL;
}
if (isset(BASHREMATCH)) {
setaparam("BASH_REMATCH", arr);
} else {
zlong offs;
char *ptr;
m = matches;
s = ztrduppfx(lhstr + m->rm_so, m->rm_eo - m->rm_so);
setsparam("MATCH", s);
/*
* Count the characters before the match.
*/
ptr = lhstr;
offs = 0;
MB_METACHARINIT();
while (ptr < lhstr + m->rm_so) {
offs++;
ptr += MB_METACHARLEN(ptr);
}
setiparam("MBEGIN", offs + !isset(KSHARRAYS));
/*
* Add on the characters in the match.
*/
while (ptr < lhstr + m->rm_eo) {
offs++;
ptr += MB_METACHARLEN(ptr);
}
setiparam("MEND", offs + !isset(KSHARRAYS) - 1);
if (nelem) {
char **mbegin, **mend, **bptr, **eptr;
bptr = mbegin = (char **)zalloc(sizeof(char *)*(nelem+1));
eptr = mend = (char **)zalloc(sizeof(char *)*(nelem+1));
for (m = matches + start, n = 0;
n < nelem;
++n, ++m, ++bptr, ++eptr)
{
char buf[DIGBUFSIZE];
ptr = lhstr;
offs = 0;
/* Find the start offset */
MB_METACHARINIT();
while (ptr < lhstr + m->rm_so) {
offs++;
ptr += MB_METACHARLEN(ptr);
}
convbase(buf, offs + !isset(KSHARRAYS), 10);
*bptr = ztrdup(buf);
/* Continue to the end offset */
while (ptr < lhstr + m->rm_eo) {
offs++;
ptr += MB_METACHARLEN(ptr);
}
convbase(buf, offs + !isset(KSHARRAYS) - 1, 10);
*eptr = ztrdup(buf);
}
*bptr = *eptr = NULL;
setaparam("match", arr);
setaparam("mbegin", mbegin);
setaparam("mend", mend);
}
}
}
else
zregex_regerrwarn(r, &re, "regex matching error");
break;
default:
DPUTS(1, "bad regex option");
return 0; /* nothing to cleanup, especially not "re". */
}
if (matches)
zfree(matches, matchessz);
regfree(&re);
return return_value;
}
static struct conddef cotab[] = {
CONDDEF("regex-match", CONDF_INFIX, zcond_regex_match, 0, 0, ZREGEX_EXTENDED)
};
static struct features module_features = {
NULL, 0,
cotab, sizeof(cotab)/sizeof(*cotab),
NULL, 0,
NULL, 0,
0
};
/**/
int
setup_(UNUSED(Module m))
{
return 0;
}
/**/
int
features_(Module m, char ***features)
{
*features = featuresarray(m, &module_features);
return 0;
}
/**/
int
enables_(Module m, int **enables)
{
return handlefeatures(m, &module_features, enables);
}
/**/
int
boot_(Module m)
{
return 0;
}
/**/
int
cleanup_(Module m)
{
return setfeatureenables(m, &module_features, NULL);
}
/**/
int
finish_(UNUSED(Module m))
{
return 0;
}
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