1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 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[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93";
39 #endif /* LIBC_SCCS and not lint */
40 #include <ctype.h>
41 #include <errno.h>
42 #include <stdlib.h>
43 #include <inttypes.h>
44 #include "xlocale_private.h"
45
46 /*
47 * Convert a string to a uintmax_t integer.
48 *
49 * Assumes that the upper and lower case
50 * alphabets and digits are each contiguous.
51 */
52 uintmax_t
strtoumax_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t locale)53 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
54 locale_t locale)
55 {
56 const char *s;
57 uintmax_t acc;
58 char c;
59 uintmax_t cutoff;
60 int neg, any, cutlim;
61 FIX_LOCALE(locale);
62
63 /*
64 * See strtoimax for comments as to the logic used.
65 */
66 s = nptr;
67 do {
68 c = *s++;
69 } while (isspace_l((unsigned char)c, locale));
70 if (c == '-') {
71 neg = 1;
72 c = *s++;
73 } else {
74 neg = 0;
75 if (c == '+')
76 c = *s++;
77 }
78 if ((base == 0 || base == 16) &&
79 c == '0' && (*s == 'x' || *s == 'X') &&
80 ((s[1] >= '0' && s[1] <= '9') ||
81 (s[1] >= 'A' && s[1] <= 'F') ||
82 (s[1] >= 'a' && s[1] <= 'f'))) {
83 c = s[1];
84 s += 2;
85 base = 16;
86 }
87 if ((base == 0 || base == 2) &&
88 c == '0' && (*s == 'b' || *s == 'B') &&
89 (s[1] >= '0' && s[1] <= '1')) {
90 c = s[1];
91 s += 2;
92 base = 2;
93 }
94 if (base == 0)
95 base = c == '0' ? 8 : 10;
96 acc = any = 0;
97 if (base < 2 || base > 36)
98 goto noconv;
99
100 cutoff = UINTMAX_MAX / base;
101 cutlim = UINTMAX_MAX % base;
102 for ( ; ; c = *s++) {
103 if (c >= '0' && c <= '9')
104 c -= '0';
105 else if (c >= 'A' && c <= 'Z')
106 c -= 'A' - 10;
107 else if (c >= 'a' && c <= 'z')
108 c -= 'a' - 10;
109 else
110 break;
111 if (c >= base)
112 break;
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 = UINTMAX_MAX;
123 errno = ERANGE;
124 } else if (!any) {
125 noconv:
126 errno = EINVAL;
127 } else if (neg)
128 acc = -acc;
129 if (endptr != NULL)
130 *endptr = (char *)(any ? s - 1 : nptr);
131 return (acc);
132 }
133 uintmax_t
strtoumax(const char * __restrict nptr,char ** __restrict endptr,int base)134 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
135 {
136 return strtoumax_l(nptr, endptr, base, __get_locale());
137 }
138