1*5570Svk199839 /* $OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $ */
2*5570Svk199839
3*5570Svk199839 /*
4*5570Svk199839 * Copyright (c) 2004 Ted Unangst and Todd Miller
5*5570Svk199839 * All rights reserved.
6*5570Svk199839 *
7*5570Svk199839 * Permission to use, copy, modify, and distribute this software for any
8*5570Svk199839 * purpose with or without fee is hereby granted, provided that the above
9*5570Svk199839 * copyright notice and this permission notice appear in all copies.
10*5570Svk199839 *
11*5570Svk199839 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12*5570Svk199839 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13*5570Svk199839 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14*5570Svk199839 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15*5570Svk199839 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16*5570Svk199839 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17*5570Svk199839 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18*5570Svk199839 */
19*5570Svk199839
20*5570Svk199839 #pragma ident "%Z%%M% %I% %E% SMI"
21*5570Svk199839
22*5570Svk199839 #include <errno.h>
23*5570Svk199839 #include <limits.h>
24*5570Svk199839 #include <stdlib.h>
25*5570Svk199839
26*5570Svk199839 #define INVALID 1
27*5570Svk199839 #define TOOSMALL 2
28*5570Svk199839 #define TOOLARGE 3
29*5570Svk199839
30*5570Svk199839 unsigned int
strtonum(const char * numstr,unsigned int minval,unsigned int maxval,const char ** errstrp)31*5570Svk199839 strtonum(const char *numstr, unsigned int minval, unsigned int maxval,
32*5570Svk199839 const char **errstrp)
33*5570Svk199839 {
34*5570Svk199839 long long ll = 0;
35*5570Svk199839 char *ep;
36*5570Svk199839 int error = 0;
37*5570Svk199839 struct errval {
38*5570Svk199839 const char *errstr;
39*5570Svk199839 int err;
40*5570Svk199839 } ev[4] = {
41*5570Svk199839 { NULL, 0 },
42*5570Svk199839 { "invalid", EINVAL },
43*5570Svk199839 { "too small", ERANGE },
44*5570Svk199839 { "too large", ERANGE },
45*5570Svk199839 };
46*5570Svk199839
47*5570Svk199839 ev[0].err = errno;
48*5570Svk199839 errno = 0;
49*5570Svk199839 if (minval > maxval)
50*5570Svk199839 error = INVALID;
51*5570Svk199839 else {
52*5570Svk199839 ll = strtoll(numstr, &ep, 10);
53*5570Svk199839 if (numstr == ep || *ep != '\0')
54*5570Svk199839 error = INVALID;
55*5570Svk199839 else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
56*5570Svk199839 error = TOOSMALL;
57*5570Svk199839 else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
58*5570Svk199839 error = TOOLARGE;
59*5570Svk199839 }
60*5570Svk199839 if (errstrp != NULL)
61*5570Svk199839 *errstrp = ev[error].errstr;
62*5570Svk199839 errno = ev[error].err;
63*5570Svk199839 if (error)
64*5570Svk199839 ll = 0;
65*5570Svk199839
66*5570Svk199839 /*
67*5570Svk199839 * we have already checked boundaries above so we can safely
68*5570Svk199839 * convert return type here
69*5570Svk199839 */
70*5570Svk199839 return ((unsigned int)ll);
71*5570Svk199839 }
72