Mercurial > sci
comparison libsci/strtonum.c @ 33:1d0ddf9e6efd
misc: general documentation
author | David Demelier <markand@malikania.fr> |
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date | Thu, 04 Aug 2022 16:47:10 +0200 |
parents | lib/strtonum.c@dd078aea5d02 |
children |
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32:081e1c258e64 | 33:1d0ddf9e6efd |
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1 /* $OpenBSD: strtonum.c,v 1.8 2015/09/13 08:31:48 guenther 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 <errno.h> | |
21 #include <limits.h> | |
22 #include <stdlib.h> | |
23 | |
24 #define INVALID 1 | |
25 #define TOOSMALL 2 | |
26 #define TOOLARGE 3 | |
27 | |
28 long long | |
29 util_strtonum(const char *numstr, long long minval, long long maxval, | |
30 const char **errstrp) | |
31 { | |
32 long long ll = 0; | |
33 int error = 0; | |
34 char *ep; | |
35 struct errval { | |
36 const char *errstr; | |
37 int err; | |
38 } ev[4] = { | |
39 { NULL, 0 }, | |
40 { "invalid", EINVAL }, | |
41 { "too small", ERANGE }, | |
42 { "too large", ERANGE }, | |
43 }; | |
44 | |
45 ev[0].err = errno; | |
46 errno = 0; | |
47 if (minval > maxval) { | |
48 error = INVALID; | |
49 } else { | |
50 ll = strtoll(numstr, &ep, 10); | |
51 if (numstr == ep || *ep != '\0') | |
52 error = INVALID; | |
53 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval) | |
54 error = TOOSMALL; | |
55 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval) | |
56 error = TOOLARGE; | |
57 } | |
58 if (errstrp != NULL) | |
59 *errstrp = ev[error].errstr; | |
60 errno = ev[error].err; | |
61 if (error) | |
62 ll = 0; | |
63 | |
64 return (ll); | |
65 } |