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ddace27b97
Negative of an unsigned value should just be the two's complement. Add code to change code with negative unsigned values to two's compliment values if compiling under visual studio.
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* $OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
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/*-
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* Copyright (c) 1992 The Regents of the University of California.
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* 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. 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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/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoull.c */
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#include "includes.h"
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#ifndef HAVE_STRTOULL
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#include <sys/types.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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/*
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* Convert a string to an unsigned long long.
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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 long
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strtoull(const char *nptr, char **endptr, int base)
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{
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const char *s;
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unsigned long long acc, cutoff;
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int c;
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int neg, any, cutlim;
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/*
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* See strtoq 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 = ULLONG_MAX / (unsigned long long)base;
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cutlim = ULLONG_MAX % (unsigned long 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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c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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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 (any < 0)
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continue;
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if (acc > cutoff || (acc == cutoff && c > cutlim)) {
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any = -1;
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acc = ULLONG_MAX;
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errno = ERANGE;
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} else {
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any = 1;
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acc *= (unsigned long 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 + 1u);
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if (endptr != 0)
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*endptr = (char *) (any ? s - 1 : nptr);
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return (acc);
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}
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#endif /* !HAVE_STRTOULL */
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