strtonum.c
1/* $OpenBSD: strtonum.c,v 1.7 2013/04/17 18:40:58 tedu 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#include "pconfig.h"
21
22#ifndef HAVE_STRTONUM
23
24#include <errno.h>
25#include <limits.h>
26#include <stdlib.h>
27
28#define INVALID 1
29#define TOOSMALL 2
30#define TOOLARGE 3
31
32#ifndef LLONG_MAX
33#define LLONG_MAX 0x7fffffffffffffffLL
34#endif
35
36#ifndef LLONG_MIN
37#define LLONG_MIN (-0x7fffffffffffffffLL-1)
38#endif
39
40long long
41strtonum(const char *numstr, long long minval, long long maxval,
42 const char **errstrp)
43{
44 long long ll = 0;
45 int error = 0;
46 char *ep;
47 struct errval {
48 const char *errstr;
49 int err;
50 } ev[4] = {
51 { NULL, 0 },
52 { "invalid", EINVAL },
53 { "too small", ERANGE },
54 { "too large", ERANGE },
55 };
56
57 ev[0].err = errno;
58 errno = 0;
59 if (minval > maxval) {
60 error = INVALID;
61 } else {
62 ll = strtoll(numstr, &ep, 10);
63 if (numstr == ep || *ep != '\0')
64 error = INVALID;
65 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
66 error = TOOSMALL;
67 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
68 error = TOOLARGE;
69 }
70 if (errstrp != NULL)
71 *errstrp = ev[error].errstr;
72 errno = ev[error].err;
73 if (error)
74 ll = 0;
75
76 return (ll);
77}
78
79#endif /* !HAVE_STRTONUM */
