source: rtems-libbsd/freebsd/lib/libc/stdlib/strtoimax.c @ 83eb07c

55-freebsd-126-freebsd-12freebsd-9.3
Last change on this file since 83eb07c was 83eb07c, checked in by Chris Johns <chrisj@…>, on May 6, 2016 at 5:06:08 AM

Add sbin/sysctl

  • Property mode set to 100644
File size: 5.0 KB
Line 
1#include <machine/rtems-bsd-user-space.h>
2
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 * All rights reserved.
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 * 4. 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)
38static char sccsid[] = "from @(#)strtol.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#ifndef __rtems__
48#include "xlocale_private.h"
49#else
50#define locale_t void*
51#define isspace_l(_c, _l) isspace(_c)
52static void* __get_locale(void) { return NULL; }
53#endif /* __rtems__ */
54
55/*
56 * Convert a string to an intmax_t integer.
57 *
58 * Assumes that the upper and lower case
59 * alphabets and digits are each contiguous.
60 */
61intmax_t
62strtoimax_l(const char * __restrict nptr, char ** __restrict endptr, int base,
63                locale_t locale)
64{
65        const char *s;
66        uintmax_t acc;
67        char c;
68        uintmax_t cutoff;
69        int neg, any, cutlim;
70#ifndef __rtems__
71        FIX_LOCALE(locale);
72#else
73        locale = NULL;
74#endif /* __rtems__ */
75
76        /*
77         * Skip white space and pick up leading +/- sign if any.
78         * If base is 0, allow 0x for hex and 0 for octal, else
79         * assume decimal; if base is already 16, allow 0x.
80         */
81        s = nptr;
82        do {
83                c = *s++;
84        } while (isspace_l((unsigned char)c, locale));
85        if (c == '-') {
86                neg = 1;
87                c = *s++;
88        } else {
89                neg = 0;
90                if (c == '+')
91                        c = *s++;
92        }
93        if ((base == 0 || base == 16) &&
94            c == '0' && (*s == 'x' || *s == 'X') &&
95            ((s[1] >= '0' && s[1] <= '9') ||
96            (s[1] >= 'A' && s[1] <= 'F') ||
97            (s[1] >= 'a' && s[1] <= 'f'))) {
98                c = s[1];
99                s += 2;
100                base = 16;
101        }
102        if (base == 0)
103                base = c == '0' ? 8 : 10;
104        acc = any = 0;
105        if (base < 2 || base > 36)
106                goto noconv;
107
108        /*
109         * Compute the cutoff value between legal numbers and illegal
110         * numbers.  That is the largest legal value, divided by the
111         * base.  An input number that is greater than this value, if
112         * followed by a legal input character, is too big.  One that
113         * is equal to this value may be valid or not; the limit
114         * between valid and invalid numbers is then based on the last
115         * digit.  For instance, if the range for intmax_t is
116         * [-9223372036854775808..9223372036854775807] and the input base
117         * is 10, cutoff will be set to 922337203685477580 and cutlim to
118         * either 7 (neg==0) or 8 (neg==1), meaning that if we have
119         * accumulated a value > 922337203685477580, or equal but the
120         * next digit is > 7 (or 8), the number is too big, and we will
121         * return a range error.
122         *
123         * Set 'any' if any `digits' consumed; make it negative to indicate
124         * overflow.
125         */
126        cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
127            : INTMAX_MAX;
128        cutlim = cutoff % base;
129        cutoff /= base;
130        for ( ; ; c = *s++) {
131                if (c >= '0' && c <= '9')
132                        c -= '0';
133                else if (c >= 'A' && c <= 'Z')
134                        c -= 'A' - 10;
135                else if (c >= 'a' && c <= 'z')
136                        c -= 'a' - 10;
137                else
138                        break;
139                if (c >= base)
140                        break;
141                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
142                        any = -1;
143                else {
144                        any = 1;
145                        acc *= base;
146                        acc += c;
147                }
148        }
149        if (any < 0) {
150                acc = neg ? INTMAX_MIN : INTMAX_MAX;
151                errno = ERANGE;
152        } else if (!any) {
153noconv:
154                errno = EINVAL;
155        } else if (neg)
156                acc = -acc;
157        if (endptr != NULL)
158                *endptr = (char *)(any ? s - 1 : nptr);
159        return (acc);
160}
161intmax_t
162strtoimax(const char * __restrict nptr, char ** __restrict endptr, int base)
163{
164        return strtoimax_l(nptr, endptr, base, __get_locale());
165}
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