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Simon Burge and I were talking about strtoul() in libkern and noticed
that it:

	* Is different from the libc implementation,

	* Generates longer code than the libc implemenation, and

	* Carries no copyright notice.

So we whipped up the attached code.  It doesn't save much space,
but it is something.

Does anyone have any problem with it replacing the existing libkern
strtoul() ?

-allen

-- 
 Allen Briggs                     briggs@wasabisystems.com
 Wasabi Systems, Inc.             http://www.wasabisystems.com/

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/*	$NetBSD: strtoul.c,v 1.15 1999/09/20 04:39:42 lukem Exp $	*/

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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.
 */

#if !defined(_KERNEL) && !defined(_STANDALONE)
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)strtoul.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: strtoul.c,v 1.15 1999/09/20 04:39:42 lukem Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

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

#else
#include <sys/param.h>
#include <lib/libkern/libkern.h>
#define _DIAGASSERT(x)	(void)0
#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;
	int base;
{
	const char *s;
	unsigned long acc, cutoff;
	int c;
	int neg, any, cutlim;

	_DIAGASSERT(nptr != NULL);
	/* endptr may be NULL */

	/*
	 * See strtol for comments as to the logic used.
	 */
	s = nptr;
	do {
		c = (unsigned char) *s++;
	} while (c == ' ' || c == '\t' || c == '\n' || c == '\r');
	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 (c >= '0' && c < ('0' + min(base, 10)))
			c -= '0';
		else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
			c &= ~0x20;	/* make upper case */
			c = c - 'A' + 10;
		} else
			break;
		if (c >= base)
			break;
		if (any < 0)
			continue;
		if (acc > cutoff || (acc == cutoff && c > cutlim)) {
			any = -1;
			acc = ULONG_MAX;
		} 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);
}

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