1*86d7f5d3SJohn Marino /* $DragonFly: src/lib/libc/stdlib/strtonum.c,v 1.2 2006/09/28 17:20:45 corecode Exp $ */
2*86d7f5d3SJohn Marino /* $OpenBSD: strtonum.c,v 1.6 2004/08/03 19:38:01 millert Exp $ */
3*86d7f5d3SJohn Marino
4*86d7f5d3SJohn Marino /*
5*86d7f5d3SJohn Marino * Copyright (c) 2004 Ted Unangst and Todd Miller
6*86d7f5d3SJohn Marino * All rights reserved.
7*86d7f5d3SJohn Marino *
8*86d7f5d3SJohn Marino * Permission to use, copy, modify, and distribute this software for any
9*86d7f5d3SJohn Marino * purpose with or without fee is hereby granted, provided that the above
10*86d7f5d3SJohn Marino * copyright notice and this permission notice appear in all copies.
11*86d7f5d3SJohn Marino *
12*86d7f5d3SJohn Marino * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13*86d7f5d3SJohn Marino * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14*86d7f5d3SJohn Marino * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15*86d7f5d3SJohn Marino * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16*86d7f5d3SJohn Marino * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17*86d7f5d3SJohn Marino * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18*86d7f5d3SJohn Marino * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19*86d7f5d3SJohn Marino */
20*86d7f5d3SJohn Marino
21*86d7f5d3SJohn Marino #include <errno.h>
22*86d7f5d3SJohn Marino #include <limits.h>
23*86d7f5d3SJohn Marino #include <stdlib.h>
24*86d7f5d3SJohn Marino
25*86d7f5d3SJohn Marino #define INVALID 1
26*86d7f5d3SJohn Marino #define TOOSMALL 2
27*86d7f5d3SJohn Marino #define TOOLARGE 3
28*86d7f5d3SJohn Marino
29*86d7f5d3SJohn Marino long long
strtonum(const char * numstr,long long minval,long long maxval,const char ** errstrp)30*86d7f5d3SJohn Marino strtonum(const char *numstr, long long minval, long long maxval,
31*86d7f5d3SJohn Marino const char **errstrp)
32*86d7f5d3SJohn Marino {
33*86d7f5d3SJohn Marino long long ll = 0;
34*86d7f5d3SJohn Marino char *ep;
35*86d7f5d3SJohn Marino int error = 0;
36*86d7f5d3SJohn Marino struct errval {
37*86d7f5d3SJohn Marino const char *errstr;
38*86d7f5d3SJohn Marino int err;
39*86d7f5d3SJohn Marino } ev[4] = {
40*86d7f5d3SJohn Marino { NULL, 0 },
41*86d7f5d3SJohn Marino { "invalid", EINVAL },
42*86d7f5d3SJohn Marino { "too small", ERANGE },
43*86d7f5d3SJohn Marino { "too large", ERANGE },
44*86d7f5d3SJohn Marino };
45*86d7f5d3SJohn Marino
46*86d7f5d3SJohn Marino ev[0].err = errno;
47*86d7f5d3SJohn Marino errno = 0;
48*86d7f5d3SJohn Marino if (minval > maxval)
49*86d7f5d3SJohn Marino error = INVALID;
50*86d7f5d3SJohn Marino else {
51*86d7f5d3SJohn Marino ll = strtoll(numstr, &ep, 10);
52*86d7f5d3SJohn Marino if (numstr == ep || *ep != '\0')
53*86d7f5d3SJohn Marino error = INVALID;
54*86d7f5d3SJohn Marino else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
55*86d7f5d3SJohn Marino error = TOOSMALL;
56*86d7f5d3SJohn Marino else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
57*86d7f5d3SJohn Marino error = TOOLARGE;
58*86d7f5d3SJohn Marino }
59*86d7f5d3SJohn Marino if (errstrp != NULL)
60*86d7f5d3SJohn Marino *errstrp = ev[error].errstr;
61*86d7f5d3SJohn Marino errno = ev[error].err;
62*86d7f5d3SJohn Marino if (error)
63*86d7f5d3SJohn Marino ll = 0;
64*86d7f5d3SJohn Marino
65*86d7f5d3SJohn Marino return (ll);
66*86d7f5d3SJohn Marino }
67