Blob


1 /*
2 * Copyright (c) 2004 Ted Unangst and Todd Miller
3 * All rights reserved.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
18 #include <errno.h>
19 #include <limits.h>
20 #include <stdlib.h>
22 #define INVALID 1
23 #define TOOSMALL 2
24 #define TOOLARGE 3
26 long long
27 strtonum(const char *numstr, long long minval, long long maxval,
28 const char **errstrp)
29 {
30 long long ll = 0;
31 int error = 0;
32 char *ep;
33 struct errval {
34 const char *errstr;
35 int err;
36 } ev[4] = {
37 { NULL, 0 },
38 { "invalid", EINVAL },
39 { "too small", ERANGE },
40 { "too large", ERANGE },
41 };
43 ev[0].err = errno;
44 errno = 0;
45 if (minval > maxval) {
46 error = INVALID;
47 } else {
48 ll = strtoll(numstr, &ep, 10);
49 if (numstr == ep || *ep != '\0')
50 error = INVALID;
51 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
52 error = TOOSMALL;
53 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
54 error = TOOLARGE;
55 }
56 if (errstrp != NULL)
57 *errstrp = ev[error].errstr;
58 errno = ev[error].err;
59 if (error)
60 ll = 0;
62 return (ll);
63 }