[openssh.git] / openbsd-compat / strtoul.c

/*	$OpenBSD: strtoul.c,v 1.7 2005/08/08 08:05:37 espie Exp $ */
/*
 * 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. 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.
 */

/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoul.c */

#include "includes.h"
#ifndef HAVE_STRTOUL

#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 = 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)
		*endptr = (char *) (any ? s - 1 : nptr);
	return (acc);
}
#endif /* !HAVE_STRTOUL */
Commit	Line	Data
4ff445f1	1	/* $OpenBSD: strtoul.c,v 1.7 2005/08/08 08:05:37 espie Exp $ */
7111a85c	2	/*
	3	* Copyright (c) 1990 Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. 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
f6d4fb87	31	/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoul.c */
f6d4fb87	32
7111a85c	33	#include "includes.h"
	34	#ifndef HAVE_STRTOUL
	35
7111a85c	36	#include <ctype.h>
	37	#include <errno.h>
	38	#include <limits.h>
	39	#include <stdlib.h>
	40
	41	/*
	42	* Convert a string to an unsigned long integer.
	43	*
	44	* Ignores `locale' stuff. Assumes that the upper and lower case
	45	* alphabets and digits are each contiguous.
	46	*/
	47	unsigned long
4ff445f1	48	strtoul(const char nptr, char *endptr, int base)
7111a85c	49	{
4ff445f1	50	const char *s;
	51	unsigned long acc, cutoff;
	52	int c;
	53	int neg, any, cutlim;
7111a85c	54
	55	/*
	56	* See strtol for comments as to the logic used.
	57	*/
	58	s = nptr;
	59	do {
	60	c = (unsigned char) *s++;
	61	} while (isspace(c));
	62	if (c == '-') {
	63	neg = 1;
	64	c = *s++;
	65	} else {
	66	neg = 0;
	67	if (c == '+')
	68	c = *s++;
	69	}
	70	if ((base == 0 \|\| base == 16) &&
	71	c == '0' && (s == 'x' \|\| s == 'X')) {
	72	c = s[1];
	73	s += 2;
	74	base = 16;
	75	}
	76	if (base == 0)
	77	base = c == '0' ? 8 : 10;
	78
	79	cutoff = ULONG_MAX / (unsigned long)base;
	80	cutlim = ULONG_MAX % (unsigned long)base;
	81	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
	82	if (isdigit(c))
	83	c -= '0';
	84	else if (isalpha(c))
	85	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
	86	else
	87	break;
	88	if (c >= base)
	89	break;
	90	if (any < 0)
	91	continue;
	92	if (acc > cutoff \|\| acc == cutoff && c > cutlim) {
	93	any = -1;
	94	acc = ULONG_MAX;
	95	errno = ERANGE;
	96	} else {
	97	any = 1;
	98	acc *= (unsigned long)base;
	99	acc += c;
	100	}
	101	}
	102	if (neg && any > 0)
	103	acc = -acc;
	104	if (endptr != 0)
	105	endptr = (char ) (any ? s - 1 : nptr);
	106	return (acc);
	107	}
	108	#endif /* !HAVE_STRTOUL */