1/*	$NetBSD: type_regex.c,v 1.8 2021/04/13 13:13:04 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1998-1999 Brett Lymn
5 *                         (blymn@baea.com.au, brett_lymn@yahoo.com.au)
6 * All rights reserved.
7 *
8 * This code has been donated to The NetBSD Foundation by the Author.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 *
30 */
31
32#include <sys/cdefs.h>
33__RCSID("$NetBSD: type_regex.c,v 1.8 2021/04/13 13:13:04 christos Exp $");
34
35#include <stdlib.h>
36#include <sys/types.h>
37#include <regex.h>
38#include "form.h"
39#include "internals.h"
40
41/*
42 * The regex type handling.
43 */
44
45typedef struct
46{
47	regex_t compiled;
48	unsigned references;
49} regex_args;
50
51/*
52 * Create the regex arguments structure from the given args.  Return NULL
53 * if the call fails, otherwise return a pointer to the structure allocated.
54 */
55static char *
56create_regex_args(va_list *args)
57{
58	regex_args *new;
59	char *expression;
60
61	new = malloc(sizeof(*new));
62
63	if (new != NULL) {
64		new->references = 1;
65		expression = va_arg(*args, char *);
66		if ((regcomp(&new->compiled, expression,
67			     (REG_EXTENDED | REG_NOSUB | REG_NEWLINE))) != 0) {
68			free(new);
69			return NULL;
70		}
71	}
72
73	return (void *) new;
74}
75
76/*
77 * Copy the regex argument structure.
78 */
79static char *
80copy_regex_args(char *args)
81{
82	((regex_args *) (void *) args)->references++;
83
84	return (void *) args;
85}
86
87/*
88 * Free the allocated storage associated with the type arguments.
89 */
90static void
91free_regex_args(char *args)
92{
93	if (args != NULL) {
94		((regex_args *) (void *) args)->references--;
95		if (((regex_args *) (void *) args)->references == 0)
96			free(args);
97	}
98}
99
100/*
101 * Check the contents of the field buffer match the regex.
102 */
103static int
104regex_check_field(FIELD *field, char *args)
105{
106	if ((args != NULL) &&
107	    (regexec(&((regex_args *) (void *) field->args)->compiled,
108		   args, (size_t) 0, NULL, 0) == 0))
109		return TRUE;
110
111	return FALSE;
112}
113
114static FIELDTYPE builtin_regex = {
115	_TYPE_HAS_ARGS | _TYPE_IS_BUILTIN,  /* flags */
116	0,                                  /* refcount */
117	NULL,                               /* link */
118	create_regex_args,                  /* make_args */
119	copy_regex_args,                    /* copy_args */
120	free_regex_args,                    /* free_args */
121	regex_check_field,                  /* field_check */
122	NULL,                               /* char_check */
123	NULL,                               /* next_choice */
124	NULL                                /* prev_choice */
125};
126
127FIELDTYPE *TYPE_REGEXP = &builtin_regex;
128
129
130