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 #include <limits.h>
38 #include <ctype.h>
39 #include <errno.h>
40 #include <stdlib.h>
41 #include "xlocale_private.h"
42
43 /*
44 * Convert a string to an unsigned long integer.
45 *
46 * Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49 unsigned long
strtoul_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t locale)50 strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base, locale_t locale)
51 {
52 const char *s;
53 unsigned long acc;
54 char c;
55 unsigned long cutoff;
56 int neg, any, cutlim;
57 FIX_LOCALE(locale);
58
59 /*
60 * See strtol for comments as to the logic used.
61 */
62 s = nptr;
63 do {
64 c = *s++;
65 } while (isspace_l((unsigned char)c, locale));
66 if (c == '-') {
67 neg = 1;
68 c = *s++;
69 } else {
70 neg = 0;
71 if (c == '+')
72 c = *s++;
73 }
74 if ((base == 0 || base == 16) &&
75 c == '0' && (*s == 'x' || *s == 'X') &&
76 ((s[1] >= '0' && s[1] <= '9') ||
77 (s[1] >= 'A' && s[1] <= 'F') ||
78 (s[1] >= 'a' && s[1] <= 'f'))) {
79 c = s[1];
80 s += 2;
81 base = 16;
82 }
83 if ((base == 0 || base == 2) &&
84 c == '0' && (*s == 'b' || *s == 'B') &&
85 (s[1] >= '0' && s[1] <= '1')) {
86 c = s[1];
87 s += 2;
88 base = 2;
89 }
90 if (base == 0)
91 base = c == '0' ? 8 : 10;
92 acc = any = 0;
93 if (base < 2 || base > 36)
94 goto noconv;
95
96 cutoff = ULONG_MAX / base;
97 cutlim = ULONG_MAX % base;
98 for ( ; ; c = *s++) {
99 if (c >= '0' && c <= '9')
100 c -= '0';
101 else if (c >= 'A' && c <= 'Z')
102 c -= 'A' - 10;
103 else if (c >= 'a' && c <= 'z')
104 c -= 'a' - 10;
105 else
106 break;
107 if (c >= base)
108 break;
109 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
110 any = -1;
111 else {
112 any = 1;
113 acc *= base;
114 acc += c;
115 }
116 }
117 if (any < 0) {
118 acc = ULONG_MAX;
119 errno = ERANGE;
120 } else if (!any) {
121 noconv:
122 errno = EINVAL;
123 } else if (neg)
124 acc = -acc;
125 if (endptr != NULL)
126 *endptr = (char *)(any ? s - 1 : nptr);
127 return (acc);
128 }
129 unsigned long
strtoul(const char * __restrict nptr,char ** __restrict endptr,int base)130 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
131 {
132 return strtoul_l(nptr, endptr, base, __get_locale());
133 }
134