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