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 <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     }
81     if ((base == 0 || base == 16) &&
82         c == '0' && (*s == 'x' || *s == 'X') &&
83         ((s[1] >= '0' && s[1] <= '9') ||
84         (s[1] >= 'A' && s[1] <= 'F') ||
85         (s[1] >= 'a' && s[1] <= 'f'))) {
86         c = s[1];
87         s += 2;
88         base = 16;
89     }
90     if (base == 0) {
91         base = c == '0' ? 8 : 10;
92     }
93     acc = any = 0;
94     if (base < 2 || base > 36) {
95         goto noconv;
96     }
97 
98     cutoff = ULONG_MAX / base;
99     cutlim = ULONG_MAX % base;
100     for (;; c = *s++) {
101         if (c >= '0' && c <= '9') {
102             c -= '0';
103         } else if (c >= 'A' && c <= 'Z') {
104             c -= 'A' - 10;
105         } else if (c >= 'a' && c <= 'z') {
106             c -= 'a' - 10;
107         } else {
108             break;
109         }
110         if (c >= base) {
111             break;
112         }
113         if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
114             any = -1;
115         } else {
116             any = 1;
117             acc *= base;
118             acc += c;
119         }
120     }
121     if (any < 0) {
122         acc = ULONG_MAX;
123         errno = ERANGE;
124     } else if (!any) {
125 noconv:
126         errno = EINVAL;
127     } else if (neg) {
128         acc = -acc;
129     }
130     if (endptr != NULL) {
131         *endptr = (char *)(any ? s - 1 : nptr);
132     }
133     return (acc);
134 }
135 unsigned long
strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)136 strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
137 {
138     return strtoul_l(nptr, endptr, base);
139 }
140