[wxWidgets.git] / src / tiff / port / strtoul.c

/* $Id$ */

/*
 * Copyright (c) 1990, 1993
 *	The 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. 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.
 */

#if 0
static char sccsid[] = "@(#)strtoul.c	8.1 (Berkeley) 6/4/93";
__RCSID("$NetBSD: strtoul.c,v 1.16 2003/08/07 16:43:45 agc Exp $");
#endif

#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>

/*
 * 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(const char *nptr, char **endptr, int base)
{
	const char *s;
	unsigned long acc, cutoff;
	int c;
	int neg, any, cutlim;

	/*
	 * See strtol for comments as to the logic used.
	 */
	s = nptr;
	do {
		c = (unsigned char) *s++;
	} while (isspace(c));
	if (c == '-') {
		neg = 1;
		c = *s++;
	} else {
		neg = 0;
		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 = ULONG_MAX / (unsigned long)base;
	cutlim = (int)(ULONG_MAX % (unsigned long)base);
	for (acc = 0, any = 0;; c = (unsigned char) *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)
			continue;
		if (acc > cutoff || (acc == cutoff && c > cutlim)) {
			any = -1;
			acc = ULONG_MAX;
			errno = ERANGE;
		} else {
			any = 1;
			acc *= (unsigned long)base;
			acc += c;
		}
	}
	if (neg && any > 0)
		acc = -acc;
	if (endptr != 0)
		/* LINTED interface specification */
		*endptr = (char *)(any ? s - 1 : nptr);
	return (acc);
}
Commit	Line	Data
8414a40c VZ	1	/* $Id$ */
	2
	3	/*
	4	* Copyright (c) 1990, 1993
	5	* The Regents of the University of California. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the name of the University nor the names of its contributors
	16	* may be used to endorse or promote products derived from this software
	17	* without specific prior written permission.
	18	*
	19	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	20	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	21	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	22	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	23	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	24	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	25	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	26	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	27	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	28	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	29	* SUCH DAMAGE.
	30	*/
	31
	32	#if 0
	33	static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
	34	__RCSID("$NetBSD: strtoul.c,v 1.16 2003/08/07 16:43:45 agc Exp $");
	35	#endif
	36
	37	#include <ctype.h>
	38	#include <errno.h>
	39	#include <limits.h>
	40	#include <stdlib.h>
	41
	42	/*
	43	* Convert a string to an unsigned long integer.
	44	*
	45	* Ignores `locale' stuff. Assumes that the upper and lower case
	46	* alphabets and digits are each contiguous.
	47	*/
	48	unsigned long
	49	strtoul(const char nptr, char *endptr, int base)
	50	{
	51	const char *s;
	52	unsigned long acc, cutoff;
	53	int c;
	54	int neg, any, cutlim;
	55
	56	/*
	57	* See strtol for comments as to the logic used.
	58	*/
	59	s = nptr;
	60	do {
	61	c = (unsigned char) *s++;
	62	} while (isspace(c));
	63	if (c == '-') {
	64	neg = 1;
65	c = *s++;
66	} else {
67	neg = 0;
68	if (c == '+')
69	c = *s++;
70	}
71	if ((base == 0 \|\| base == 16) &&
72	c == '0' && (s == 'x' \|\| s == 'X')) {
73	c = s[1];
74	s += 2;
75	base = 16;
76	}
77	if (base == 0)
78	base = c == '0' ? 8 : 10;
79
80	cutoff = ULONG_MAX / (unsigned long)base;
81	cutlim = (int)(ULONG_MAX % (unsigned long)base);
82	for (acc = 0, any = 0;; c = (unsigned char) *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;
91	if (any < 0)
92	continue;
93	if (acc > cutoff \|\| (acc == cutoff && c > cutlim)) {
94	any = -1;
95	acc = ULONG_MAX;
96	errno = ERANGE;
97	} else {
98	any = 1;
99	acc *= (unsigned long)base;
100	acc += c;
101	}
102	}
103	if (neg && any > 0)
104	acc = -acc;
105	if (endptr != 0)
106	/* LINTED interface specification */
107	endptr = (char )(any ? s - 1 : nptr);
108	return (acc);
109	}