1 /*
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
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.
20 *
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.
32 */
33
34 #include "port_before.h"
35
36 #include <sys/types.h>
37 #include <sys/param.h>
38
39 #include <ctype.h>
40 #include <errno.h>
41 #include <limits.h>
42 #include <stdlib.h>
43
44 #include "port_after.h"
45
46 #ifndef NEED_STRTOUL
47 int __strtoul_unneeded__;
48 #else
49
50 /*%
51 * Convert a string to an unsigned long integer.
52 *
53 * Ignores `locale' stuff. Assumes that the upper and lower case
54 * alphabets and digits are each contiguous.
55 */
56 u_long
strtoul(const char * nptr,char ** endptr,int base)57 strtoul(const char *nptr, char **endptr, int base) {
58 const char *s = nptr;
59 u_long acc, cutoff;
60 int neg, c, any, cutlim;
61
62 neg = 0;
63
64 /*
65 * See strtol for comments as to the logic used.
66 */
67 do {
68 c = *(const unsigned char *)s++;
69 } while (isspace(c));
70 if (c == '-') {
71 neg = 1;
72 c = *s++;
73 } else if (c == '+')
74 c = *s++;
75 if ((base == 0 || base == 16) &&
76 c == '0' && (*s == 'x' || *s == 'X')) {
77 c = s[1];
78 s += 2;
79 base = 16;
80 }
81 if (base == 0)
82 base = c == '0' ? 8 : 10;
83 cutoff = (u_long)ULONG_MAX / (u_long)base;
84 cutlim = (u_long)ULONG_MAX % (u_long)base;
85 for (acc = 0, any = 0;; c = *(const unsigned char*)s++) {
86 if (isdigit(c))
87 c -= '0';
88 else if (isalpha(c))
89 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
90 else
91 break;
92 if (c >= base)
93 break;
94 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
95 any = -1;
96 else {
97 any = 1;
98 acc *= base;
99 acc += c;
100 }
101 }
102 if (any < 0) {
103 acc = ULONG_MAX;
104 errno = ERANGE;
105 } else if (neg)
106 acc = -acc;
107 if (endptr != 0)
108 DE_CONST((any ? s - 1 : nptr), *endptr);
109 return (acc);
110 }
111
112 #endif /*NEED_STRTOUL*/
113
114 /*! \file */
115