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 <sys/cdefs.h>
41 // __FBSDID("$FreeBSD$");
42
43 #include <ctype.h>
44 #include <errno.h>
45 #include <stdlib.h>
46 #include <inttypes.h>
47 // #include "xlocale_private.h"
48
49 /*
50 * Convert a string to a uintmax_t integer.
51 *
52 * Assumes that the upper and lower case
53 * alphabets and digits are each contiguous.
54 */
55 uintmax_t
strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base)56 strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base)
57 {
58 const char *s;
59 uintmax_t acc;
60 char c;
61 uintmax_t cutoff;
62 int neg, any, cutlim;
63 // FIX_LOCALE(locale);
64
65 /*
66 * See strtoimax 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 = UINTMAX_MAX / base;
99 cutlim = UINTMAX_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 = UINTMAX_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 uintmax_t
strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)136 strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
137 {
138 return strtoumax_l(nptr, endptr, base);
139 }
140