strtonum.c revision 162853
1272343Sngie/*	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $	*/
2272343Sngie
3272343Sngie/*
4272343Sngie * Copyright (c) 2004 Ted Unangst and Todd Miller
5272343Sngie * All rights reserved.
6272343Sngie *
7272343Sngie * Permission to use, copy, modify, and distribute this software for any
8272343Sngie * purpose with or without fee is hereby granted, provided that the above
9272343Sngie * copyright notice and this permission notice appear in all copies.
10272343Sngie *
11272343Sngie * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12272343Sngie * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13272343Sngie * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14272343Sngie * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15272343Sngie * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16272343Sngie * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17272343Sngie * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18272343Sngie */
19272343Sngie
20272343Sngie/* OPENBSD ORIGINAL: lib/libc/stdlib/strtonum.c */
21272343Sngie
22272343Sngie#include "includes.h"
23272343Sngie
24272343Sngie#ifndef HAVE_STRTONUM
25272343Sngie#include <stdlib.h>
26272343Sngie#include <limits.h>
27272343Sngie#include <errno.h>
28272343Sngie
29272343Sngie#define INVALID 	1
30272343Sngie#define TOOSMALL 	2
31272343Sngie#define TOOLARGE 	3
32272343Sngie
33272343Sngielong long
34272343Sngiestrtonum(const char *numstr, long long minval, long long maxval,
35272343Sngie    const char **errstrp)
36272343Sngie{
37272343Sngie	long long ll = 0;
38272343Sngie	char *ep;
39272343Sngie	int error = 0;
40272343Sngie	struct errval {
41272343Sngie		const char *errstr;
42272343Sngie		int err;
43272343Sngie	} ev[4] = {
44272343Sngie		{ NULL,		0 },
45272343Sngie		{ "invalid",	EINVAL },
46		{ "too small",	ERANGE },
47		{ "too large",	ERANGE },
48	};
49
50	ev[0].err = errno;
51	errno = 0;
52	if (minval > maxval)
53		error = INVALID;
54	else {
55		ll = strtoll(numstr, &ep, 10);
56		if (numstr == ep || *ep != '\0')
57			error = INVALID;
58		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
59			error = TOOSMALL;
60		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
61			error = TOOLARGE;
62	}
63	if (errstrp != NULL)
64		*errstrp = ev[error].errstr;
65	errno = ev[error].err;
66	if (error)
67		ll = 0;
68
69	return (ll);
70}
71
72#endif /* HAVE_STRTONUM */
73