110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/* SPDX-License-Identifier: BSD-4-Clause-UC */
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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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#include <limits.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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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 strtoul(const char *nptr, char **endptr, register int base)
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{
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register const char *s = nptr;
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register unsigned long acc;
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register int c;
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register unsigned long cutoff;
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register int neg = 0, any, cutlim;
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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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do {
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c = *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 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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}
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cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
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cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
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for (acc = 0, any = 0;; c = *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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c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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} else {
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break;
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}
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if (c >= base) {
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break;
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}
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if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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} else {
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any = 1;
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acc *= base;
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acc += c;
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}
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}
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if (any < 0) {
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acc = ULONG_MAX;
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errno = ERANGE;
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} else if (neg) {
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acc = -acc;
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}
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if (endptr != NULL) {
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*endptr = (char *)(any ? s - 1 : nptr);
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}
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return acc;
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}
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