1 /* $NetBSD: strtoul.c,v 1.1.1.2 2012/09/09 16:07:42 christos Exp $ */
2
3 #if defined(LIBC_SCCS) && !defined(lint)
4 static const char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
5 static const char rcsid[] = "Id: strtoul.c,v 1.4 2008/02/18 03:49:08 marka Exp ";
6 #endif /* LIBC_SCCS and not lint */
7
8 /*
9 * Copyright (c) 1990, 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include "port_before.h"
42
43 #include <sys/types.h>
44 #include <sys/param.h>
45
46 #include <ctype.h>
47 #include <errno.h>
48 #include <limits.h>
49 #include <stdlib.h>
50
51 #include "port_after.h"
52
53 #ifndef NEED_STRTOUL
54 int __strtoul_unneeded__;
55 #else
56
57 /*%
58 * Convert a string to an unsigned long integer.
59 *
60 * Ignores `locale' stuff. Assumes that the upper and lower case
61 * alphabets and digits are each contiguous.
62 */
63 u_long
strtoul(const char * nptr,char ** endptr,int base)64 strtoul(const char *nptr, char **endptr, int base) {
65 const char *s = nptr;
66 u_long acc, cutoff;
67 int neg, c, any, cutlim;
68
69 neg = 0;
70
71 /*
72 * See strtol for comments as to the logic used.
73 */
74 do {
75 c = *(const unsigned char *)s++;
76 } while (isspace(c));
77 if (c == '-') {
78 neg = 1;
79 c = *s++;
80 } else if (c == '+')
81 c = *s++;
82 if ((base == 0 || base == 16) &&
83 c == '0' && (*s == 'x' || *s == 'X')) {
84 c = s[1];
85 s += 2;
86 base = 16;
87 }
88 if (base == 0)
89 base = c == '0' ? 8 : 10;
90 cutoff = (u_long)ULONG_MAX / (u_long)base;
91 cutlim = (u_long)ULONG_MAX % (u_long)base;
92 for (acc = 0, any = 0;; c = *(const unsigned char*)s++) {
93 if (isdigit(c))
94 c -= '0';
95 else if (isalpha(c))
96 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
97 else
98 break;
99 if (c >= base)
100 break;
101 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
102 any = -1;
103 else {
104 any = 1;
105 acc *= base;
106 acc += c;
107 }
108 }
109 if (any < 0) {
110 acc = ULONG_MAX;
111 errno = ERANGE;
112 } else if (neg)
113 acc = -acc;
114 if (endptr != 0)
115 DE_CONST((any ? s - 1 : nptr), *endptr);
116 return (acc);
117 }
118
119 #endif /*NEED_STRTOUL*/
120
121 /*! \file */
122