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 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: head/lib/libc/stdlib/strtoumax.c 251672 2013-06-13 00:19:30Z emaste $");
40
41 #include <ctype.h>
42 #include <errno.h>
43 #include <stdlib.h>
44 #include <inttypes.h>
45 #include <stdint.h>
46 #include "../locale/setlocale.h"
47
48 /*
49 * Convert a string to a uintmax_t integer.
50 *
51 * Assumes that the upper and lower case
52 * alphabets and digits are each contiguous.
53 */
54
55 #ifndef _REENT_ONLY
56
57 uintmax_t
_strtoumax_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t loc)58 _strtoumax_l(const char * __restrict nptr,
59 char ** __restrict endptr, int base, locale_t loc)
60 {
61 const char *s = nptr;
62 uintmax_t acc;
63 char c;
64 uintmax_t cutoff;
65 int neg = 0, any, cutlim;
66
67 /*
68 * See strtoimax for comments as to the logic used.
69 */
70 do {
71 c = *s++;
72 } while (isspace_l(c, loc));
73 if (c == '-') {
74 neg = 1;
75 c = *s++;
76 } else {
77 neg = 0;
78 if (c == '+')
79 c = *s++;
80 }
81 if ((base == 0 || base == 16) &&
82 c == '0' && (*s == 'x' || *s == 'X')) {
83 c = s[1];
84 s += 2;
85 base = 16;
86 }
87 if (base == 0)
88 base = c == '0' ? 8 : 10;
89 acc = any = 0;
90 if (base < 2 || base > 36)
91 goto noconv;
92
93 cutoff = UINTMAX_MAX / base;
94 cutlim = UINTMAX_MAX % base;
95 for ( ; ; c = *s++) {
96 if (c >= '0' && c <= '9')
97 c -= '0';
98 else if (c >= 'A' && c <= 'Z')
99 c -= 'A' - 10;
100 else if (c >= 'a' && c <= 'z')
101 c -= 'a' - 10;
102 else
103 break;
104 if (c >= base)
105 break;
106 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
107 any = -1;
108 else {
109 any = 1;
110 acc *= base;
111 acc += c;
112 }
113 }
114 if (any < 0) {
115 acc = UINTMAX_MAX;
116 __errno_r(rptr) = ERANGE;
117 } else if (!any) {
118 noconv:
119 __errno_r(rptr) = EINVAL;
120 } else if (neg)
121 acc = -acc;
122 if (endptr != NULL)
123 *endptr = (char *)(any ? s - 1 : nptr);
124 return (acc);
125 }
126
127
128 uintmax_t
strtoumax(const char * __restrict nptr,char ** __restrict endptr,int base)129 strtoumax(const char* __restrict nptr, char** __restrict endptr, int base)
130 {
131 return strtoumax_l(nptr, endptr, base, __get_current_locale());
132 }
133
134 #endif
135