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f11db3c7fc
It can be called with NULL for third argument. grub_divmod32* for now are called only from within wrappers, so skip check. Reported-By: Michael Zimmermann <sigmaepsilon92@gmail.com>
75 lines
1.6 KiB
C
75 lines
1.6 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2015 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/misc.h>
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#include <grub/dl.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_uint64_t
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abs64(grub_int64_t a)
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{
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return a > 0 ? a : -a;
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}
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grub_int64_t
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grub_divmod64s (grub_int64_t n,
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grub_int64_t d,
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grub_int64_t *ro)
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{
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grub_uint64_t ru;
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grub_int64_t q, r;
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q = grub_divmod64 (abs64(n), abs64(d), &ru);
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r = ru;
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/* Now: |n| = |d| * q + r */
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if (n < 0)
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{
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/* -|n| = |d| * (-q) + (-r) */
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q = -q;
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r = -r;
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}
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/* Now: n = |d| * q + r */
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if (d < 0)
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{
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/* n = (-|d|) * (-q) + r */
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q = -q;
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}
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/* Now: n = d * q + r */
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if (ro)
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*ro = r;
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return q;
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}
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grub_uint32_t
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grub_divmod32 (grub_uint32_t n, grub_uint32_t d, grub_uint32_t *ro)
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{
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grub_uint64_t q, r;
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q = grub_divmod64 (n, d, &r);
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*ro = r;
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return q;
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}
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grub_int32_t
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grub_divmod32s (grub_int32_t n, grub_int32_t d, grub_int32_t *ro)
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{
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grub_int64_t q, r;
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q = grub_divmod64s (n, d, &r);
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*ro = r;
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return q;
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}
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