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comparison libiberty/strtoul.c @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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-1:000000000000 0:a06113de4d67
1 /*
2 * Copyright (c) 1990 Regents of the University of California.
3 * 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. [rescinded 22 July 1999]
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34 #ifdef HAVE_LIMITS_H
35 #include <limits.h>
36 #endif
37 #ifdef HAVE_SYS_PARAM_H
38 #include <sys/param.h>
39 #endif
40 #include <errno.h>
41 #ifdef NEED_DECLARATION_ERRNO
42 extern int errno;
43 #endif
44 #if 0
45 #include <stdlib.h>
46 #endif
47 #include "ansidecl.h"
48 #include "safe-ctype.h"
49
50 #ifndef ULONG_MAX
51 #define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
52 #endif
53
54 /*
55 * Convert a string to an unsigned long integer.
56 *
57 * Ignores `locale' stuff. Assumes that the upper and lower case
58 * alphabets and digits are each contiguous.
59 */
60 unsigned long
61 strtoul(const char *nptr, char **endptr, register int base)
62 {
63 register const char *s = nptr;
64 register unsigned long acc;
65 register int c;
66 register unsigned long cutoff;
67 register int neg = 0, any, cutlim;
68
69 /*
70 * See strtol for comments as to the logic used.
71 */
72 do {
73 c = *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 = (unsigned long)ULONG_MAX / (unsigned long)base;
89 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
90 for (acc = 0, any = 0;; c = *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 *endptr = (char *) (any ? s - 1 : nptr);
114 return (acc);
115 }