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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 "config.h"
20 #include <errno.h>
21 #include <limits.h>
22 #include <stdlib.h>
24 #define INVALID 1
25 #define TOOSMALL 2
26 #define TOOLARGE 3
28 long long
29 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 };
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;
64 return (ll);
65 }