1/*-
2 * Copyright (C) 2015 Baptiste Daroussin <bapt@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28#include <errno.h>
29#include <inttypes.h>
30#include <limits.h>
31#include <stdlib.h>
32
33#include "pw.h"
34
35uintmax_t
36strtounum(const char * __restrict np, uintmax_t minval, uintmax_t maxval,
37    const char ** __restrict errpp)
38{
39	char *endp;
40	uintmax_t ret;
41
42	*errpp = NULL;
43	if (minval > maxval) {
44		errno = EINVAL;
45		*errpp = "invalid";
46		return (0);
47	}
48	errno = 0;
49	ret = strtoumax(np, &endp, 10);
50	if (endp == np || *endp != '\0') {
51		errno = EINVAL;
52		*errpp = "invalid";
53		return (0);
54	}
55	if (ret < minval) {
56		errno = ERANGE;
57		*errpp = "too small";
58		return (0);
59	}
60	if (errno == ERANGE || ret > maxval) {
61		errno = ERANGE;
62		*errpp = "too large";
63		return (0);
64	}
65	return (ret);
66}
67