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 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $");
41
42 #include <ctype.h>
43 #include <errno.h>
44 #include <stdlib.h>
45 #include <inttypes.h>
46 #include <stdint.h>
47 #include "../locale/setlocale.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
56 #ifndef _REENT_ONLY
57
58 uintmax_t
strtoumax_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t loc)59 strtoumax_l(const char * __restrict nptr,
60 char ** __restrict endptr, int base, locale_t loc)
61 {
62 const char *s = nptr;
63 uintmax_t acc;
64 char c;
65 uintmax_t cutoff;
66 int neg = 0, any, cutlim;
67
68 /*
69 * See strtoimax for comments as to the logic used.
70 */
71 do {
72 c = *s++;
73 } while (isspace_l(c, loc));
74 if (c == '-') {
75 neg = 1;
76 c = *s++;
77 } else {
78 neg = 0;
79 if (c == '+')
80 c = *s++;
81 }
82 if ((base == 0 || base == 16) &&
83 c == '0' && (*s == 'x' || *s == 'X')) {
84 c = s[1];
85 s += 2;
86 base = 16;
87 }
88 if (base == 0)
89 base = c == '0' ? 8 : 10;
90 acc = any = 0;
91 if (base < 2 || base > 36)
92 goto noconv;
93
94 cutoff = UINTMAX_MAX / base;
95 cutlim = UINTMAX_MAX % base;
96 for ( ; ; c = *s++) {
97 if (c >= '0' && c <= '9')
98 c -= '0';
99 else if (c >= 'A' && c <= 'Z')
100 c -= 'A' - 10;
101 else if (c >= 'a' && c <= 'z')
102 c -= 'a' - 10;
103 else
104 break;
105 if (c >= base)
106 break;
107 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
108 any = -1;
109 else {
110 any = 1;
111 acc *= base;
112 acc += c;
113 }
114 }
115 if (any < 0) {
116 acc = UINTMAX_MAX;
117 _REENT_ERRNO(rptr) = ERANGE;
118 } else if (!any) {
119 noconv:
120 _REENT_ERRNO(rptr) = EINVAL;
121 } else if (neg)
122 acc = -acc;
123 if (endptr != NULL)
124 *endptr = (char *)(any ? s - 1 : nptr);
125 return (acc);
126 }
127
128
129 uintmax_t
strtoumax(const char * __restrict nptr,char ** __restrict endptr,int base)130 strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
131 {
132 return strtoumax_l(nptr, endptr, base, __get_current_locale());
133 }
134
135 #endif
136
