compat_strtonum.c revision b7d613ae8a2fc1530d33aff53a1a678d284bfeec
1#include "config.h"
2
3#if HAVE_STRTONUM
4
5int dummy;
6
7#else
8
9/*	$Id: compat_strtonum.c,v 1.1 2015/02/16 14:56:22 schwarze Exp $	*/
10/*	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu Exp $	*/
11
12/*
13 * Copyright (c) 2004 Ted Unangst and Todd Miller
14 * All rights reserved.
15 *
16 * Permission to use, copy, modify, and distribute this software for any
17 * purpose with or without fee is hereby granted, provided that the above
18 * copyright notice and this permission notice appear in all copies.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
21 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
23 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
24 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
25 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
26 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
27 */
28
29#include <errno.h>
30#include <limits.h>
31#include <stdlib.h>
32
33#define	INVALID		1
34#define	TOOSMALL	2
35#define	TOOLARGE	3
36
37long long
38strtonum(const char *numstr, long long minval, long long maxval,
39    const char **errstrp)
40{
41	long long ll = 0;
42	int error = 0;
43	char *ep;
44	struct errval {
45		const char *errstr;
46		int err;
47	} ev[4] = {
48		{ NULL,		0 },
49		{ "invalid",	EINVAL },
50		{ "too small",	ERANGE },
51		{ "too large",	ERANGE },
52	};
53
54	ev[0].err = errno;
55	errno = 0;
56	if (minval > maxval) {
57		error = INVALID;
58	} else {
59		ll = strtoll(numstr, &ep, 10);
60		if (numstr == ep || *ep != '\0')
61			error = INVALID;
62		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
63			error = TOOSMALL;
64		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
65			error = TOOLARGE;
66	}
67	if (errstrp != NULL)
68		*errstrp = ev[error].errstr;
69	errno = ev[error].err;
70	if (error)
71		ll = 0;
72
73	return (ll);
74}
75
76#endif /* !HAVE_STRTONUM */
77