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1 /*	$OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert 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 /* OPENBSD ORIGINAL: lib/libc/stdlib/strtonum.c */
21 
22 #include "includes.h"
23 
24 #ifndef HAVE_STRTONUM
25 #include <stdlib.h>
26 #include <limits.h>
27 #include <errno.h>
28 
29 #define INVALID 	1
30 #define TOOSMALL 	2
31 #define TOOLARGE 	3
32 
33 long long
strtonum(const char * numstr,long long minval,long long maxval,const char ** errstrp)34 strtonum(const char *numstr, long long minval, long long maxval,
35     const char **errstrp)
36 {
37 	long long ll = 0;
38 	char *ep;
39 	int error = 0;
40 	struct errval {
41 		const char *errstr;
42 		int err;
43 	} ev[4] = {
44 		{ NULL,		0 },
45 		{ "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