[deliverable/binutils-gdb.git] / libiberty / strtoul.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 [rescinded 22 July 1999]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.
 */

#include <limits.h>
#include <ctype.h>
#include <errno.h>
#if 0
#include <stdlib.h>
#endif
#include "ansidecl.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);
}
Commit	Line	Data
252b5132 RH	1	/*
	2	* Copyright (c) 1990 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
e2eaf477	13	* 3. [rescinded 22 July 1999]
252b5132 RH	14	* 4. Neither the name of the University nor the names of its contributors
	15	* may be used to endorse or promote products derived from this software
	16	* without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
	31	#include <limits.h>
	32	#include <ctype.h>
	33	#include <errno.h>
	34	#if 0
	35	#include <stdlib.h>
	36	#endif
	37	#include "ansidecl.h"
	38
	39	#ifndef ULONG_MAX
	40	#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
	41	#endif
	42
	43	/*
	44	* Convert a string to an unsigned long integer.
	45	*
	46	* Ignores `locale' stuff. Assumes that the upper and lower case
	47	* alphabets and digits are each contiguous.
	48	*/
	49	unsigned long
	50	strtoul(nptr, endptr, base)
	51	const char *nptr;
	52	char **endptr;
	53	register int base;
	54	{
	55	register const char *s = nptr;
	56	register unsigned long acc;
	57	register int c;
	58	register unsigned long cutoff;
	59	register int neg = 0, any, cutlim;
	60
	61	/*
	62	* See strtol for comments as to the logic used.
	63	*/
	64	do {
	65	c = *s++;
	66	} while (isspace(c));
	67	if (c == '-') {
	68	neg = 1;
	69	c = *s++;
	70	} else if (c == '+')
	71	c = *s++;
	72	if ((base == 0 \|\| base == 16) &&
	73	c == '0' && (s == 'x' \|\| s == 'X')) {
	74	c = s[1];
	75	s += 2;
	76	base = 16;
	77	}
78	if (base == 0)
79	base = c == '0' ? 8 : 10;
80	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
81	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
82	for (acc = 0, any = 0;; c = *s++) {
83	if (isdigit(c))
84	c -= '0';
85	else if (isalpha(c))
86	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
87	else
88	break;
89	if (c >= base)
90	break;
e2eaf477	91	if (any < 0 \|\| acc > cutoff \|\| (acc == cutoff && c > cutlim))
252b5132 RH	92	any = -1;
	93	else {
	94	any = 1;
	95	acc *= base;
	96	acc += c;
	97	}
	98	}
	99	if (any < 0) {
	100	acc = ULONG_MAX;
	101	errno = ERANGE;
	102	} else if (neg)
	103	acc = -acc;
	104	if (endptr != 0)
	105	endptr = (char ) (any ? s - 1 : nptr);
	106	return (acc);
	107	}