1 /* $NetBSD: strtonum.c,v 1.7 2024/01/20 16:13:39 christos Exp $ */
2 /*-
3 * Copyright (c) 2014 The NetBSD Foundation, Inc.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Christos Zoulas.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __RCSID("$NetBSD: strtonum.c,v 1.7 2024/01/20 16:13:39 christos Exp $");
33
34 #include "namespace.h"
35
36 #define _OPENBSD_SOURCE
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <errno.h>
40 #include <inttypes.h>
41
42 long long
strtonum(const char * nptr,long long minval,long long maxval,const char ** errstr)43 strtonum(const char *nptr, long long minval, long long maxval,
44 const char **errstr)
45 {
46 int e;
47 long long rv;
48 const char *resp;
49 char *eptr;
50
51 if (errstr == NULL)
52 errstr = &resp;
53
54 if (minval > maxval)
55 goto out;
56
57 rv = (long long)strtoi(nptr, &eptr, 10, minval, maxval, &e);
58
59 switch (e) {
60 case 0:
61 *errstr = NULL;
62 return rv;
63 case ECANCELED:
64 case ENOTSUP:
65 goto out;
66 case ERANGE:
67 if (*eptr)
68 goto out;
69 *errstr = rv == maxval ? "too large" : "too small";
70 return 0;
71 default:
72 abort();
73 }
74
75 out:
76 *errstr = "invalid";
77 return 0;
78 }
79