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/* AS regular expression routine
Copyright (C) 1999 Kunihiro Ishiguro
This file is part of GNU Zebra.
GNU Zebra 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, or (at your option) any
later version.
GNU Zebra 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 GNU Zebra; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include <zebra.h>
#include "log.h"
#include "command.h"
#include "memory.h"
#include "queue.h"
#include "filter.h"
#include "bgpd.h"
#include "bgp_aspath.h"
#include "bgp_regex.h"
/* Character `_' has special mean. It represents [,{}() ] and the
beginning of the line(^) and the end of the line ($).
(^|[,{}() ]|$) */
regex_t *
bgp_regcomp (const char *regstr)
{
/* Convert _ character to generic regular expression. */
int i, j;
int len;
int magic = 0;
char *magic_str;
char magic_regexp[] = "(^|[,{}() ]|$)";
int ret;
regex_t *regex;
len = strlen (regstr);
for (i = 0; i < len; i++)
if (regstr[i] == '_')
magic++;
magic_str = XMALLOC (MTYPE_TMP, len + (14 * magic) + 1);
for (i = 0, j = 0; i < len; i++)
{
if (regstr[i] == '_')
{
memcpy (magic_str + j, magic_regexp, strlen (magic_regexp));
j += strlen (magic_regexp);
}
else
magic_str[j++] = regstr[i];
}
magic_str[j] = '\0';
regex = XMALLOC (MTYPE_BGP_REGEXP, sizeof (regex_t));
ret = regcomp (regex, magic_str, REG_EXTENDED|REG_NOSUB);
XFREE (MTYPE_TMP, magic_str);
if (ret != 0)
{
XFREE (MTYPE_BGP_REGEXP, regex);
return NULL;
}
return regex;
}
int
bgp_regexec (regex_t *regex, struct aspath *aspath)
{
return regexec (regex, aspath->str, 0, NULL, 0);
}
void
bgp_regex_free (regex_t *regex)
{
regfree (regex);
XFREE (MTYPE_BGP_REGEXP, regex);
}
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