1/*	$OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu 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#include "../util.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
69long long
70enstrtonum(int status, const char *numstr, long long minval, long long maxval)
71{
72	const char *errstr;
73	long long ll;
74
75	ll = strtonum(numstr, minval, maxval, &errstr);
76	if (errstr)
77		enprintf(status, "strtonum %s: %s\n", numstr, errstr);
78	return ll;
79}
80
81long long
82estrtonum(const char *numstr, long long minval, long long maxval)
83{
84	return enstrtonum(1, numstr, minval, maxval);
85}