1/*	$Id: compat_strtonum.c,v 1.2 2020/06/15 01:37:15 schwarze Exp $	*/
2/*	$OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $	*/
3
4/*
5 * Copyright (c) 2004 Ted Unangst and Todd Miller
6 * All rights reserved.
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20#include "config.h"
21
22#include <errno.h>
23#include <limits.h>
24#include <stdlib.h>
25
26#define	INVALID		1
27#define	TOOSMALL	2
28#define	TOOLARGE	3
29
30long long
31strtonum(const char *numstr, long long minval, long long maxval,
32    const char **errstrp)
33{
34	long long ll = 0;
35	int error = 0;
36	char *ep;
37	struct errval {
38		const char *errstr;
39		int err;
40	} ev[4] = {
41		{ NULL,		0 },
42		{ "invalid",	EINVAL },
43		{ "too small",	ERANGE },
44		{ "too large",	ERANGE },
45	};
46
47	ev[0].err = errno;
48	errno = 0;
49	if (minval > maxval) {
50		error = INVALID;
51	} else {
52		ll = strtoll(numstr, &ep, 10);
53		if (numstr == ep || *ep != '\0')
54			error = INVALID;
55		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
56			error = TOOSMALL;
57		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
58			error = TOOLARGE;
59	}
60	if (errstrp != NULL)
61		*errstrp = ev[error].errstr;
62	errno = ev[error].err;
63	if (error)
64		ll = 0;
65
66	return (ll);
67}
68