quakeforge/libs/gib/gib_regex.c

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/*
#FILENAME#
#DESCRIPTION#
Copyright (C) 2002 #AUTHOR#
Author: #AUTHOR#
Date: #DATE#
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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 GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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static __attribute__ ((unused))
const char rcsid[] =
"$Id$";
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include "regex.h"
#include "QF/dstring.h"
#include "QF/hash.h"
#include "gib_regex.h"
#include "QF/qtypes.h"
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hashtab_t *gib_regexs;
static char errstr[1024];
static const char *
GIB_Regex_Get_Key (void *ele, void *ptr)
{
return ((gib_regex_t *) ele)->regex;
}
static void
GIB_Regex_Free (void *ele, void *ptr)
{
regfree (&(((gib_regex_t *) ele)->comp));
free (((gib_regex_t *) ele)->regex);
free (ele);
}
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void
GIB_Regex_Init (void)
{
gib_regexs = Hash_NewTable (512, GIB_Regex_Get_Key, GIB_Regex_Free, 0);
}
regex_t *
GIB_Regex_Compile (const char *regex, int cflags)
{
static unsigned int num_regexs = 0;
gib_regex_t *reg;
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int res;
// Already compiled ?
if ((reg = Hash_Find (gib_regexs, regex))) {
// Did cflags change?
if (cflags != reg->cflags) {
// Try to recompile
reg->cflags = cflags;
if ((res = regcomp (&(reg->comp), regex, cflags))) {
// Blew up, remove from hash
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regerror (res, &(reg->comp), errstr, sizeof (errstr));
regfree (&(reg->comp));
free (reg->regex);
free (Hash_Del (gib_regexs, regex));
num_regexs--;
return 0;
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} else
return &(reg->comp);
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} else
return &(reg->comp);
} else {
reg = calloc (1, sizeof (gib_regex_t));
if ((res = regcomp (&(reg->comp), regex, cflags))) {
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regerror (res, &(reg->comp), errstr, sizeof (errstr));
regfree (&(reg->comp));
free (reg);
return 0;
} else {
reg->cflags = cflags;
reg->regex = strdup (regex);
if (++num_regexs > 128) {
Hash_FlushTable (gib_regexs);
num_regexs = 0;
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}
Hash_Add (gib_regexs, reg);
return &(reg->comp);
}
}
}
const char *
GIB_Regex_Error (void)
{
return errstr;
}
int
GIB_Regex_Translate_Options (const char *opstr)
{
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int options = 0;
if (strchr (opstr, 'i'))
options |= REG_ICASE;
if (strchr (opstr, 'n'))
options |= REG_NEWLINE;
return options;
}
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unsigned int
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GIB_Regex_Apply_Match (regmatch_t match[10], dstring_t * dstr, unsigned int ofs,
const char *replace)
{
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int i, start, len, sub, rlen = strlen (replace);
char *matched;
start = match[0].rm_so + ofs;
len = match[0].rm_eo - match[0].rm_so;
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// Save matched pattern space
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matched = calloc (len + 1, sizeof (char));
memcpy (matched, dstr->str + start, match[0].rm_eo - match[0].rm_so);
dstring_replace (dstr, start, len, replace, rlen);
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for (i = start; i < start + rlen; i++) {
if (dstr->str[i] == '\\') {
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if (dstr->str[i + 1] == '&') {
dstring_snip (dstr, i, 1);
rlen--;
continue;
}
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if (isdigit ((byte) dstr->str[i + 1])) {
if (i && dstr->str[i - 1] == '\\') { // Escaped, not a true
// back reference
dstring_snip (dstr, i, 1);
rlen--;
continue;
}
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sub = dstr->str[i + 1] - '0';
if (match[sub].rm_so != -1) {
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dstring_replace (dstr, i, 2, matched + match[sub].rm_so,
match[sub].rm_eo - match[sub].rm_so);
rlen += match[sub].rm_eo - match[sub].rm_so - 2;
} else {
dstring_snip (dstr, i, 2);
rlen -= 2;
}
}
} else if (dstr->str[i] == '&') {
dstring_replace (dstr, i, 1, matched, len);
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rlen += strlen (matched) - 1;
}
}
free (matched);
return rlen + match[0].rm_so;
}