1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93";
37 #endif /* LIBC_SCCS and not lint */
38 #define _DEFAULT_SOURCE
39
40 #include <ctype.h>
41 #include <errno.h>
42 #include <stdlib.h>
43 #include <inttypes.h>
44 #include <stdint.h>
45 #include "../locale/setlocale.h"
46
47 /*
48 * Convert a string to a uintmax_t integer.
49 *
50 * Assumes that the upper and lower case
51 * alphabets and digits are each contiguous.
52 */
53
54 #ifndef _REENT_ONLY
55
56 uintmax_t
strtoumax_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t loc)57 strtoumax_l(const char * __restrict nptr,
58 char ** __restrict endptr, int base, locale_t loc)
59 {
60 const char *s = nptr;
61 uintmax_t acc;
62 char c;
63 uintmax_t cutoff;
64 int neg = 0, any, cutlim;
65
66 /*
67 * See strtoimax for comments as to the logic used.
68 */
69 do {
70 c = *s++;
71 } while (isspace_l(c, loc));
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 c = s[1];
83 s += 2;
84 base = 16;
85 }
86 if (base == 0)
87 base = c == '0' ? 8 : 10;
88 acc = any = 0;
89 if (base < 2 || base > 36)
90 goto noconv;
91
92 cutoff = UINTMAX_MAX / base;
93 cutlim = UINTMAX_MAX % base;
94 for ( ; ; c = *s++) {
95 if (c >= '0' && c <= '9')
96 c -= '0';
97 else if (c >= 'A' && c <= 'Z')
98 c -= 'A' - 10;
99 else if (c >= 'a' && c <= 'z')
100 c -= 'a' - 10;
101 else
102 break;
103 if (c >= base)
104 break;
105 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
106 any = -1;
107 else {
108 any = 1;
109 acc *= base;
110 acc += c;
111 }
112 }
113 if (any < 0) {
114 acc = UINTMAX_MAX;
115 _REENT_ERRNO(rptr) = ERANGE;
116 } else if (!any) {
117 noconv:
118 _REENT_ERRNO(rptr) = EINVAL;
119 } else if (neg)
120 acc = -acc;
121 if (endptr != NULL)
122 *endptr = (char *)(any ? s - 1 : nptr);
123 return (acc);
124 }
125
126
127 uintmax_t
strtoumax(const char * __restrict nptr,char ** __restrict endptr,int base)128 strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
129 {
130 return strtoumax_l(nptr, endptr, base, __get_current_locale());
131 }
132
133 #endif
134
