mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-24 06:09:06 +08:00
119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1990 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. [rescinded 22 July 1999]
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
#ifdef HAVE_LIMITS_H
|
|
#include <limits.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_PARAM_H
|
|
#include <sys/param.h>
|
|
#endif
|
|
#include <errno.h>
|
|
#ifdef NEED_DECLARATION_ERRNO
|
|
extern int errno;
|
|
#endif
|
|
#if 0
|
|
#include <stdlib.h>
|
|
#endif
|
|
#include "ansidecl.h"
|
|
#include "safe-ctype.h"
|
|
|
|
#ifndef ULONG_MAX
|
|
#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
|
|
#endif
|
|
|
|
/*
|
|
* Convert a string to an unsigned long integer.
|
|
*
|
|
* Ignores `locale' stuff. Assumes that the upper and lower case
|
|
* alphabets and digits are each contiguous.
|
|
*/
|
|
unsigned long
|
|
strtoul(nptr, endptr, base)
|
|
const char *nptr;
|
|
char **endptr;
|
|
register int base;
|
|
{
|
|
register const char *s = nptr;
|
|
register unsigned long acc;
|
|
register int c;
|
|
register unsigned long cutoff;
|
|
register int neg = 0, any, cutlim;
|
|
|
|
/*
|
|
* See strtol for comments as to the logic used.
|
|
*/
|
|
do {
|
|
c = *s++;
|
|
} while (ISSPACE(c));
|
|
if (c == '-') {
|
|
neg = 1;
|
|
c = *s++;
|
|
} else if (c == '+')
|
|
c = *s++;
|
|
if ((base == 0 || base == 16) &&
|
|
c == '0' && (*s == 'x' || *s == 'X')) {
|
|
c = s[1];
|
|
s += 2;
|
|
base = 16;
|
|
}
|
|
if (base == 0)
|
|
base = c == '0' ? 8 : 10;
|
|
cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
|
|
cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
|
|
for (acc = 0, any = 0;; c = *s++) {
|
|
if (ISDIGIT(c))
|
|
c -= '0';
|
|
else if (ISALPHA(c))
|
|
c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
|
|
else
|
|
break;
|
|
if (c >= base)
|
|
break;
|
|
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
|
|
any = -1;
|
|
else {
|
|
any = 1;
|
|
acc *= base;
|
|
acc += c;
|
|
}
|
|
}
|
|
if (any < 0) {
|
|
acc = ULONG_MAX;
|
|
errno = ERANGE;
|
|
} else if (neg)
|
|
acc = -acc;
|
|
if (endptr != 0)
|
|
*endptr = (char *) (any ? s - 1 : nptr);
|
|
return (acc);
|
|
}
|