69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
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/*
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* Unsigned long long arithmetic limited library, tailored for wmmon's
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* specific needs.
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*
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* Copyright (c) 2014 Pedro Gimeno Fortea
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*
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* This file is part of wmmon.
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*
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* wmmon is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wmmon is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wmmon; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef HAVE_LONG_LONG_INT
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#include "ulllib.h"
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void ullreset(ullong *target) {
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target->H = target->L = 0;
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}
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void ulladd(ullong *target, const ullong *toadd) {
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unsigned long tmpL = toadd->L, tmpH = toadd->H;
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target->L += tmpL;
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/* Carry if the result is less than one of the operands */
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target->H += tmpH + (target->L < tmpL);
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}
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long ullsub(const ullong *a, const ullong *b) {
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/* Will wrap around correctly if necessary. Result is assumed to
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fit a signed long. */
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/* assert((a->H == b->H && a->L >= b->L)
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|| (a->H == b->H + 1 && a->L < b->L)); */
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return a->L - b->L;
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}
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void ullparse(ullong *target, const char *str) {
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ullong tmp;
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ullreset(target);
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while (*str >= '0' && *str <= '9') {
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tmp = *target;
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ulladd(target, target); /* *2 */
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ulladd(target, target); /* *4 */
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ulladd(target, &tmp); /* *5 */
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ulladd(target, target); /* *10 */
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tmp.H = 0;
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tmp.L = *str - '0';
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ulladd(target, &tmp); /* + digit */
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++str;
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}
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}
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#endif /* HAVE_LONG_LONG_INT */
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typedef int make_iso_compilers_happy;
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