1 c423c56e 2022-09-25 op /*
 2 c423c56e 2022-09-25 op  * Copyright (c) 2004 Ted Unangst and Todd Miller
 3 c423c56e 2022-09-25 op  * All rights reserved.
 4 c423c56e 2022-09-25 op  *
 5 c423c56e 2022-09-25 op  * Permission to use, copy, modify, and distribute this software for any
 6 c423c56e 2022-09-25 op  * purpose with or without fee is hereby granted, provided that the above
 7 c423c56e 2022-09-25 op  * copyright notice and this permission notice appear in all copies.
 8 c423c56e 2022-09-25 op  *
 9 c423c56e 2022-09-25 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 c423c56e 2022-09-25 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 c423c56e 2022-09-25 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 c423c56e 2022-09-25 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 c423c56e 2022-09-25 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 c423c56e 2022-09-25 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 c423c56e 2022-09-25 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 c423c56e 2022-09-25 op  */
17 c423c56e 2022-09-25 op 
18 c423c56e 2022-09-25 op #include <errno.h>
19 c423c56e 2022-09-25 op #include <limits.h>
20 c423c56e 2022-09-25 op #include <stdlib.h>
21 c423c56e 2022-09-25 op 
22 c423c56e 2022-09-25 op #define	INVALID		1
23 c423c56e 2022-09-25 op #define	TOOSMALL	2
24 c423c56e 2022-09-25 op #define	TOOLARGE	3
25 c423c56e 2022-09-25 op 
26 c423c56e 2022-09-25 op long long
27 c423c56e 2022-09-25 op strtonum(const char *numstr, long long minval, long long maxval,
28 c423c56e 2022-09-25 op     const char **errstrp)
29 c423c56e 2022-09-25 op {
30 c423c56e 2022-09-25 op 	long long ll = 0;
31 c423c56e 2022-09-25 op 	int error = 0;
32 c423c56e 2022-09-25 op 	char *ep;
33 c423c56e 2022-09-25 op 	struct errval {
34 c423c56e 2022-09-25 op 		const char *errstr;
35 c423c56e 2022-09-25 op 		int err;
36 c423c56e 2022-09-25 op 	} ev[4] = {
37 c423c56e 2022-09-25 op 		{ NULL,		0 },
38 c423c56e 2022-09-25 op 		{ "invalid",	EINVAL },
39 c423c56e 2022-09-25 op 		{ "too small",	ERANGE },
40 c423c56e 2022-09-25 op 		{ "too large",	ERANGE },
41 c423c56e 2022-09-25 op 	};
42 c423c56e 2022-09-25 op 
43 c423c56e 2022-09-25 op 	ev[0].err = errno;
44 c423c56e 2022-09-25 op 	errno = 0;
45 c423c56e 2022-09-25 op 	if (minval > maxval) {
46 c423c56e 2022-09-25 op 		error = INVALID;
47 c423c56e 2022-09-25 op 	} else {
48 c423c56e 2022-09-25 op 		ll = strtoll(numstr, &ep, 10);
49 c423c56e 2022-09-25 op 		if (numstr == ep || *ep != '\0')
50 c423c56e 2022-09-25 op 			error = INVALID;
51 c423c56e 2022-09-25 op 		else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
52 c423c56e 2022-09-25 op 			error = TOOSMALL;
53 c423c56e 2022-09-25 op 		else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
54 c423c56e 2022-09-25 op 			error = TOOLARGE;
55 c423c56e 2022-09-25 op 	}
56 c423c56e 2022-09-25 op 	if (errstrp != NULL)
57 c423c56e 2022-09-25 op 		*errstrp = ev[error].errstr;
58 c423c56e 2022-09-25 op 	errno = ev[error].err;
59 c423c56e 2022-09-25 op 	if (error)
60 c423c56e 2022-09-25 op 		ll = 0;
61 c423c56e 2022-09-25 op 
62 c423c56e 2022-09-25 op 	return (ll);
63 c423c56e 2022-09-25 op }