1 #if defined(LIBC_SCCS) && !defined(lint)
2 static const char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
3 static const char rcsid[] = "$Id: strtoul.c,v 1.4 2008/02/18 03:49:08 marka Exp $";
4 #endif /* LIBC_SCCS and not lint */
5
6 /*
7 * Copyright (c) 1990, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include "port_before.h"
40
41 #include <sys/types.h>
42 #include <sys/param.h>
43
44 #include <ctype.h>
45 #include <errno.h>
46 #include <limits.h>
47 #include <stdlib.h>
48
49 #include "port_after.h"
50
51 #ifndef NEED_STRTOUL
52 int __strtoul_unneeded__;
53 #else
54
55 /*%
56 * Convert a string to an unsigned long integer.
57 *
58 * Ignores `locale' stuff. Assumes that the upper and lower case
59 * alphabets and digits are each contiguous.
60 */
61 u_long
strtoul(const char * nptr,char ** endptr,int base)62 strtoul(const char *nptr, char **endptr, int base) {
63 const char *s = nptr;
64 u_long acc, cutoff;
65 int neg, c, any, cutlim;
66
67 neg = 0;
68
69 /*
70 * See strtol for comments as to the logic used.
71 */
72 do {
73 c = *(const unsigned char *)s++;
74 } while (isspace(c));
75 if (c == '-') {
76 neg = 1;
77 c = *s++;
78 } else if (c == '+')
79 c = *s++;
80 if ((base == 0 || base == 16) &&
81 c == '0' && (*s == 'x' || *s == 'X')) {
82 c = s[1];
83 s += 2;
84 base = 16;
85 }
86 if (base == 0)
87 base = c == '0' ? 8 : 10;
88 cutoff = (u_long)ULONG_MAX / (u_long)base;
89 cutlim = (u_long)ULONG_MAX % (u_long)base;
90 for (acc = 0, any = 0;; c = *(const unsigned char*)s++) {
91 if (isdigit(c))
92 c -= '0';
93 else if (isalpha(c))
94 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
95 else
96 break;
97 if (c >= base)
98 break;
99 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
100 any = -1;
101 else {
102 any = 1;
103 acc *= base;
104 acc += c;
105 }
106 }
107 if (any < 0) {
108 acc = ULONG_MAX;
109 errno = ERANGE;
110 } else if (neg)
111 acc = -acc;
112 if (endptr != 0)
113 DE_CONST((any ? s - 1 : nptr), *endptr);
114 return (acc);
115 }
116
117 #endif /*NEED_STRTOUL*/
118
119 /*! \file */
120