1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 *
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
39 #endif /* LIBC_SCCS and not lint */
40 #include <limits.h>
41 #include <ctype.h>
42 #include <errno.h>
43 #include <stdlib.h>
44 #include "xlocale_private.h"
45
46 /*
47 * Convert a string to an unsigned long integer.
48 *
49 * Assumes that the upper and lower case
50 * alphabets and digits are each contiguous.
51 */
52 unsigned long
strtoul_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t locale)53 strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale)
54 {
55 const char *s;
56 unsigned long acc;
57 char c;
58 unsigned long cutoff;
59 int neg, any, cutlim;
60 FIX_LOCALE(locale);
61
62 /*
63 * See strtol for comments as to the logic used.
64 */
65 s = nptr;
66 do {
67 c = *s++;
68 } while (isspace_l((unsigned char)c, locale));
69 if (c == '-') {
70 neg = 1;
71 c = *s++;
72 } else {
73 neg = 0;
74 if (c == '+')
75 c = *s++;
76 }
77 if ((base == 0 || base == 16) &&
78 c == '0' && (*s == 'x' || *s == 'X') &&
79 ((s[1] >= '0' && s[1] <= '9') ||
80 (s[1] >= 'A' && s[1] <= 'F') ||
81 (s[1] >= 'a' && s[1] <= 'f'))) {
82 c = s[1];
83 s += 2;
84 base = 16;
85 }
86 if ((base == 0 || base == 2) &&
87 c == '0' && (*s == 'b' || *s == 'B') &&
88 (s[1] >= '0' && s[1] <= '1')) {
89 c = s[1];
90 s += 2;
91 base = 2;
92 }
93 if (base == 0)
94 base = c == '0' ? 8 : 10;
95 acc = any = 0;
96 if (base < 2 || base > 36)
97 goto noconv;
98
99 cutoff = ULONG_MAX / base;
100 cutlim = ULONG_MAX % base;
101 for ( ; ; c = *s++) {
102 if (c >= '0' && c <= '9')
103 c -= '0';
104 else if (c >= 'A' && c <= 'Z')
105 c -= 'A' - 10;
106 else if (c >= 'a' && c <= 'z')
107 c -= 'a' - 10;
108 else
109 break;
110 if (c >= base)
111 break;
112 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
113 any = -1;
114 else {
115 any = 1;
116 acc *= base;
117 acc += c;
118 }
119 }
120 if (any < 0) {
121 acc = ULONG_MAX;
122 errno = ERANGE;
123 } else if (!any) {
124 noconv:
125 errno = EINVAL;
126 } else if (neg)
127 acc = -acc;
128 if (endptr != NULL)
129 *endptr = (char *)(any ? s - 1 : nptr);
130 return (acc);
131 }
132 unsigned long
strtoul(const char * __restrict nptr,char ** __restrict endptr,int base)133 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
134 {
135 return strtoul_l(nptr, endptr, base, __get_locale());
136 }
137