2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 2011 The FreeBSD Foundation
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 * @(#)strtol.c 8.1 (Berkeley) 6/4/93
35 * $FreeBSD: head/lib/libc/stdlib/strtol.c 251672 2013-06-13 00:19:30Z emaste $
43 #include "xlocale_private.h"
47 * Convert a string to a long integer.
49 * Assumes that the upper and lower case
50 * alphabets and digits are each contiguous.
53 strtol_l(const char * __restrict nptr, char ** __restrict endptr, int base,
64 * Skip white space and pick up leading +/- sign if any.
65 * If base is 0, allow 0x for hex and 0 for octal, else
66 * assume decimal; if base is already 16, allow 0x.
71 } while (isspace_l((unsigned char)c, locale));
80 if ((base == 0 || base == 16) &&
81 c == '0' && (*s == 'x' || *s == 'X') &&
82 ((s[1] >= '0' && s[1] <= '9') ||
83 (s[1] >= 'A' && s[1] <= 'F') ||
84 (s[1] >= 'a' && s[1] <= 'f'))) {
90 base = c == '0' ? 8 : 10;
92 if (base < 2 || base > 36)
96 * Compute the cutoff value between legal numbers and illegal
97 * numbers. That is the largest legal value, divided by the
98 * base. An input number that is greater than this value, if
99 * followed by a legal input character, is too big. One that
100 * is equal to this value may be valid or not; the limit
101 * between valid and invalid numbers is then based on the last
102 * digit. For instance, if the range for longs is
103 * [-2147483648..2147483647] and the input base is 10,
104 * cutoff will be set to 214748364 and cutlim to either
105 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
106 * a value > 214748364, or equal but the next digit is > 7 (or 8),
107 * the number is too big, and we will return a range error.
109 * Set 'any' if any `digits' consumed; make it negative to indicate
112 cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
114 cutlim = cutoff % base;
116 for ( ; ; c = *s++) {
117 if (c >= '0' && c <= '9')
119 else if (c >= 'A' && c <= 'Z')
121 else if (c >= 'a' && c <= 'z')
127 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
136 acc = neg ? LONG_MIN : LONG_MAX;
144 *endptr = (char *)(any ? s - 1 : nptr);
148 strtol(const char * __restrict nptr, char ** __restrict endptr, int base)
150 return strtol_l(nptr, endptr, base, __get_locale());
153 strtold(const char * __restrict nptr, char ** __restrict endptr)
155 return strtold_l(nptr, endptr, __get_locale());