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 #include <ctype.h>
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <inttypes.h>
41 #include "xlocale_private.h"
42
43 /*
44 * Convert a string to a uintmax_t integer.
45 *
46 * Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49 uintmax_t
strtoumax_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t locale)50 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
51 locale_t locale)
52 {
53 const char *s;
54 uintmax_t acc;
55 char c;
56 uintmax_t cutoff;
57 int neg, any, cutlim;
58 FIX_LOCALE(locale);
59
60 /*
61 * See strtoimax for comments as to the logic used.
62 */
63 s = nptr;
64 do {
65 c = *s++;
66 } while (isspace_l((unsigned char)c, locale));
67 if (c == '-') {
68 neg = 1;
69 c = *s++;
70 } else {
71 neg = 0;
72 if (c == '+')
73 c = *s++;
74 }
75 if ((base == 0 || base == 16) &&
76 c == '0' && (*s == 'x' || *s == 'X') &&
77 ((s[1] >= '0' && s[1] <= '9') ||
78 (s[1] >= 'A' && s[1] <= 'F') ||
79 (s[1] >= 'a' && s[1] <= 'f'))) {
80 c = s[1];
81 s += 2;
82 base = 16;
83 }
84 if ((base == 0 || base == 2) &&
85 c == '0' && (*s == 'b' || *s == 'B') &&
86 (s[1] >= '0' && s[1] <= '1')) {
87 c = s[1];
88 s += 2;
89 base = 2;
90 }
91 if (base == 0)
92 base = c == '0' ? 8 : 10;
93 acc = any = 0;
94 if (base < 2 || base > 36)
95 goto noconv;
96
97 cutoff = UINTMAX_MAX / base;
98 cutlim = UINTMAX_MAX % base;
99 for ( ; ; c = *s++) {
100 if (c >= '0' && c <= '9')
101 c -= '0';
102 else if (c >= 'A' && c <= 'Z')
103 c -= 'A' - 10;
104 else if (c >= 'a' && c <= 'z')
105 c -= 'a' - 10;
106 else
107 break;
108 if (c >= base)
109 break;
110 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
111 any = -1;
112 else {
113 any = 1;
114 acc *= base;
115 acc += c;
116 }
117 }
118 if (any < 0) {
119 acc = UINTMAX_MAX;
120 errno = ERANGE;
121 } else if (!any) {
122 noconv:
123 errno = EINVAL;
124 } else if (neg)
125 acc = -acc;
126 if (endptr != NULL)
127 *endptr = (char *)(any ? s - 1 : nptr);
128 return (acc);
129 }
130 uintmax_t
strtoumax(const char * __restrict nptr,char ** __restrict endptr,int base)131 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
132 {
133 return strtoumax_l(nptr, endptr, base, __get_locale());
134 }
135