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/* $NetBSD: type_regex.c,v 1.7 2004/11/24 11:57:09 blymn Exp $ */
/*-
* Copyright (c) 1998-1999 Brett Lymn
* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
* All rights reserved.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: type_regex.c,v 1.7 2004/11/24 11:57:09 blymn Exp $");
#include <stdlib.h>
#include <sys/types.h>
#include <regex.h>
#include "form.h"
#include "internals.h"
/*
* The regex type handling.
*/
typedef struct
{
regex_t compiled;
unsigned references;
} regex_args;
/*
* Create the regex arguments structure from the given args. Return NULL
* if the call fails, otherwise return a pointer to the structure allocated.
*/
static char *
create_regex_args(va_list *args)
{
regex_args *new;
char *expression;
new = (regex_args *) malloc(sizeof(regex_args));
if (new != NULL) {
new->references = 1;
expression = va_arg(*args, char *);
if ((regcomp(&new->compiled, expression,
(REG_EXTENDED | REG_NOSUB | REG_NEWLINE))) != 0) {
free(new);
return NULL;
}
}
return (void *) new;
}
/*
* Copy the regex argument structure.
*/
static char *
copy_regex_args(char *args)
{
((regex_args *) (void *) args)->references++;
return (void *) args;
}
/*
* Free the allocated storage associated with the type arguments.
*/
static void
free_regex_args(char *args)
{
if (args != NULL) {
((regex_args *) (void *) args)->references--;
if (((regex_args *) (void *) args)->references == 0)
free(args);
}
}
/*
* Check the contents of the field buffer match the regex.
*/
static int
regex_check_field(FIELD *field, char *args)
{
if ((args != NULL) &&
(regexec(&((regex_args *) (void *) field->args)->compiled,
args, (size_t) 0, NULL, 0) == 0))
return TRUE;
return FALSE;
}
static FIELDTYPE builtin_regex = {
_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN, /* flags */
0, /* refcount */
NULL, /* link */
create_regex_args, /* make_args */
copy_regex_args, /* copy_args */
free_regex_args, /* free_args */
regex_check_field, /* field_check */
NULL, /* char_check */
NULL, /* next_choice */
NULL /* prev_choice */
};
FIELDTYPE *TYPE_REGEXP = &builtin_regex;
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