tstrtonum.c - ltk - Socket-based GUI for X11 (WIP)
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---
tstrtonum.c (1814B)
---
1 /* Note: Taken from OpenBSD:
2 * $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther Exp $
3 */
4
5 /*
6 * Copyright (c) 2004 Ted Unangst and Todd Miller
7 * All rights reserved.
8 *
9 * Permission to use, copy, modify, and/or distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 */
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
31 ltk_strtonum(
32 const char *numstr, long long minval,
33 long long maxval, const char **errstrp) {
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 }