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