1 /* $Id: compat_strtonum.c,v 1.2 2020/06/15 01:37:15 schwarze Exp $ */
2 /* $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $ */
3
4 /*
5 * Copyright (c) 2004 Ted Unangst and Todd Miller
6 * All rights reserved.
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20 #include "config.h"
21
22 #include <errno.h>
23 #include <limits.h>
24 #include <stdlib.h>
25
26 #define INVALID 1
27 #define TOOSMALL 2
28 #define TOOLARGE 3
29
30 long long
strtonum(const char * numstr,long long minval,long long maxval,const char ** errstrp)31 strtonum(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