dnsmasq: stay close as possible to master branch
[tomato.git] / release / src-rt-6.x.4708 / router / snmp / snmplib / strtoul.c
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1 /*
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #include <net-snmp/net-snmp-config.h>
36 #if !HAVE_STRTOUL
38 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
40 #endif /* LIBC_SCCS and not lint */
42 #if HAVE_LIMITS_H
43 #include <limits.h>
44 #endif
45 #include <ctype.h>
46 #include <errno.h>
47 #if HAVE_STDLIB_H
48 #include <stdlib.h>
49 #endif
52 * Convert a string to an unsigned long integer.
54 * Ignores `locale' stuff. Assumes that the upper and lower case
55 * alphabets and digits are each contiguous.
57 unsigned long
58 strtoul(const char *nptr, char **endptr, int base)
60 const char *s = nptr;
61 unsigned long acc;
62 unsigned char c;
63 unsigned long cutoff;
64 int neg = 0, any, cutlim;
67 * See strtol for comments as to the logic used.
69 do {
70 c = *s++;
71 } while (isspace(c));
72 if (c == '-') {
73 neg = 1;
74 c = *s++;
75 } else if (c == '+')
76 c = *s++;
77 if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) {
78 c = s[1];
79 s += 2;
80 base = 16;
82 if (base == 0)
83 base = c == '0' ? 8 : 10;
84 cutoff = (unsigned long) ULONG_MAX / (unsigned long) base;
85 cutlim = (unsigned long) ULONG_MAX % (unsigned long) base;
86 for (acc = 0, any = 0;; c = *s++) {
87 if (!isascii(c))
88 break;
89 if (isdigit(c))
90 c -= '0';
91 else if (isalpha(c))
92 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
93 else
94 break;
95 if (c >= base)
96 break;
97 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
98 any = -1;
99 else {
100 any = 1;
101 acc *= base;
102 acc += c;
105 if (any < 0) {
106 acc = ULONG_MAX;
107 errno = ERANGE;
108 } else if (neg)
109 acc = -acc;
110 if (endptr != 0)
111 *endptr = (char *) (any ? s - 1 : nptr);
112 return (acc);
115 #endif /* !HAVE_STRTOUL */