1 dd038bc6 2021-09-21 thomas.ad /*	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $	*/
 2 dd038bc6 2021-09-21 thomas.ad 
 3 dd038bc6 2021-09-21 thomas.ad /*
 4 dd038bc6 2021-09-21 thomas.ad  * Copyright (c) 2004 Ted Unangst and Todd Miller
 5 dd038bc6 2021-09-21 thomas.ad  * All rights reserved.
 6 dd038bc6 2021-09-21 thomas.ad  *
 7 dd038bc6 2021-09-21 thomas.ad  * Permission to use, copy, modify, and distribute this software for any
 8 dd038bc6 2021-09-21 thomas.ad  * purpose with or without fee is hereby granted, provided that the above
 9 dd038bc6 2021-09-21 thomas.ad  * copyright notice and this permission notice appear in all copies.
10 dd038bc6 2021-09-21 thomas.ad  *
11 dd038bc6 2021-09-21 thomas.ad  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 dd038bc6 2021-09-21 thomas.ad  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 dd038bc6 2021-09-21 thomas.ad  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 dd038bc6 2021-09-21 thomas.ad  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 dd038bc6 2021-09-21 thomas.ad  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 dd038bc6 2021-09-21 thomas.ad  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 dd038bc6 2021-09-21 thomas.ad  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 dd038bc6 2021-09-21 thomas.ad  */
19 dd038bc6 2021-09-21 thomas.ad 
20 dd038bc6 2021-09-21 thomas.ad #include <errno.h>
21 dd038bc6 2021-09-21 thomas.ad #include <limits.h>
22 dd038bc6 2021-09-21 thomas.ad #include <stdlib.h>
23 dd038bc6 2021-09-21 thomas.ad 
24 dd038bc6 2021-09-21 thomas.ad #define INVALID 	1
25 dd038bc6 2021-09-21 thomas.ad #define TOOSMALL 	2
26 dd038bc6 2021-09-21 thomas.ad #define TOOLARGE 	3
27 dd038bc6 2021-09-21 thomas.ad 
28 dd038bc6 2021-09-21 thomas.ad long long
29 dd038bc6 2021-09-21 thomas.ad strtonum(const char *numstr, long long minval, long long maxval,
30 dd038bc6 2021-09-21 thomas.ad     const char **errstrp)
31 dd038bc6 2021-09-21 thomas.ad {
32 dd038bc6 2021-09-21 thomas.ad 	long long ll = 0;
33 dd038bc6 2021-09-21 thomas.ad 	char *ep;
34 dd038bc6 2021-09-21 thomas.ad 	int error = 0;
35 dd038bc6 2021-09-21 thomas.ad 	struct errval {
36 dd038bc6 2021-09-21 thomas.ad 		const char *errstr;
37 dd038bc6 2021-09-21 thomas.ad 		int err;
38 dd038bc6 2021-09-21 thomas.ad 	} ev[4] = {
39 dd038bc6 2021-09-21 thomas.ad 		{ NULL,		0 },
40 dd038bc6 2021-09-21 thomas.ad 		{ "invalid",	EINVAL },
41 dd038bc6 2021-09-21 thomas.ad 		{ "too small",	ERANGE },
42 dd038bc6 2021-09-21 thomas.ad 		{ "too large",	ERANGE },
43 dd038bc6 2021-09-21 thomas.ad 	};
44 dd038bc6 2021-09-21 thomas.ad 
45 dd038bc6 2021-09-21 thomas.ad 	ev[0].err = errno;
46 dd038bc6 2021-09-21 thomas.ad 	errno = 0;
47 dd038bc6 2021-09-21 thomas.ad 	if (minval > maxval)
48 dd038bc6 2021-09-21 thomas.ad 		error = INVALID;
49 dd038bc6 2021-09-21 thomas.ad 	else {
50 dd038bc6 2021-09-21 thomas.ad 		ll = strtoll(numstr, &ep, 10);
51 dd038bc6 2021-09-21 thomas.ad 		if (numstr == ep || *ep != '\0')
52 dd038bc6 2021-09-21 thomas.ad 			error = INVALID;
53 dd038bc6 2021-09-21 thomas.ad 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
54 dd038bc6 2021-09-21 thomas.ad 			error = TOOSMALL;
55 dd038bc6 2021-09-21 thomas.ad 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
56 dd038bc6 2021-09-21 thomas.ad 			error = TOOLARGE;
57 dd038bc6 2021-09-21 thomas.ad 	}
58 dd038bc6 2021-09-21 thomas.ad 	if (errstrp != NULL)
59 dd038bc6 2021-09-21 thomas.ad 		*errstrp = ev[error].errstr;
60 dd038bc6 2021-09-21 thomas.ad 	errno = ev[error].err;
61 dd038bc6 2021-09-21 thomas.ad 	if (error)
62 dd038bc6 2021-09-21 thomas.ad 		ll = 0;
63 dd038bc6 2021-09-21 thomas.ad 
64 dd038bc6 2021-09-21 thomas.ad 	return (ll);
65 dd038bc6 2021-09-21 thomas.ad }