strtonum.c revision 1.8 
1/*	$NetBSD: strtonum.c,v 1.8 2025/09/20 12:19:31 christos Exp $	*/
2/*-
3 * Copyright (c) 2014 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Christos Zoulas.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if HAVE_NBTOOL_CONFIG_H
32#include "nbtool_config.h"
33#endif
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37__RCSID("$NetBSD: strtonum.c,v 1.8 2025/09/20 12:19:31 christos Exp $");
38#endif
39
40#include "namespace.h"
41
42#define _OPENBSD_SOURCE
43#include <stdio.h>
44#include <stdlib.h>
45#include <errno.h>
46#include <inttypes.h>
47
48long long
49strtonum(const char *nptr, long long minval, long long maxval,
50         const char **errstr)
51{
52	int e;
53	long long rv;
54	const char *resp;
55	char *eptr;
56
57	if (errstr == NULL)
58		errstr = &resp;
59
60	if (minval > maxval)
61		goto out;
62
63	rv = (long long)strtoi(nptr, &eptr, 10, minval, maxval, &e);
64
65	switch (e) {
66	case 0:
67		*errstr = NULL;
68		return rv;
69	case ECANCELED:
70	case ENOTSUP:
71		goto out;
72	case ERANGE:
73		if (*eptr)
74			goto out;
75		*errstr = rv == maxval ? "too large" : "too small";
76		return 0;
77	default:
78		abort();
79	}
80
81out:
82	*errstr = "invalid";
83	return 0;
84}
85