b2566d8735
totally different version that was here. This version, of course, has an BSD license on it while the old one did not. This one also compiles down to tighter code--the smaller the better for libkern & libsa.
148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/* $NetBSD: strtoul.c,v 1.6 2003/06/07 02:52:33 briggs Exp $ */
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: strtoul.c,v 1.6 2003/06/07 02:52:33 briggs Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#else
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#include <sys/param.h>
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#include <lib/libkern/libkern.h>
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#define _DIAGASSERT(x) (void)0
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#define isspace(x) ((x) == ' ' || (x) == '\t' || (x) == '\n' || (x) == '\r')
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#define isdigit(x) ((x) >= '0' && (x) <= '9')
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#define isalpha(x) (((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z'))
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#define toupper(x) ((x) & ~0x20)
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#endif
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/*
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* Convert a string to an unsigned long integer.
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*
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* Ignores `locale' stuff. Assumes that the upper and lower case
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* alphabets and digits are each contiguous.
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*/
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unsigned long
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strtoul(nptr, endptr, base)
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const char *nptr;
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char **endptr;
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int base;
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{
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const char *s;
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unsigned long acc, cutoff;
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int c;
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int neg, any, cutlim;
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_DIAGASSERT(nptr != NULL);
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/* endptr may be NULL */
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/*
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* See strtol for comments as to the logic used.
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*/
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s = nptr;
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do {
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c = (unsigned char) *s++;
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} while (isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == '+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X')) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if (base == 0)
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base = c == '0' ? 8 : 10;
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cutoff = ULONG_MAX / (unsigned long)base;
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cutlim = (int)(ULONG_MAX % (unsigned long)base);
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for (acc = 0, any = 0;; c = (unsigned char) *s++) {
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if (isdigit(c))
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c -= '0';
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else if (isalpha(c)) {
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#if defined(_KERNEL) || defined(_STANDALONE)
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c = toupper(c) - 'A' + 10;
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#else
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c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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#endif
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} else
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break;
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if (c >= base)
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break;
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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if (any < 0)
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continue;
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#endif
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if (acc > cutoff || (acc == cutoff && c > cutlim)) {
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#if defined(_KERNEL) || defined(_STANDALONE)
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if (endptr)
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*endptr = (char *) nptr;
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return ULONG_MAX;
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#else
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any = -1;
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acc = ULONG_MAX;
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errno = ERANGE;
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#endif
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} else {
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any = 1;
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acc *= (unsigned long)base;
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acc += c;
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}
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}
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if (neg && any > 0)
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acc = -acc;
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if (endptr != NULL)
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/* LINTED interface specification */
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*endptr = (char *)(any ? s - 1 : nptr);
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return (acc);
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}
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