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Add imaxdiv

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Hugues Morisset 2022-09-23 23:15:09 +02:00
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commit 36892c4dd6
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32
libc/fmt/imaxdiv.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/conv.h"
imaxdiv_t imaxdiv(intmax_t n, intmax_t d) {
imaxdiv_t retval;
retval.quot = n / d;
retval.rem = n % d;
// satisfy quot*denominator+rem == numerator
if (n > 0 && retval.rem < 0) {
retval.quot += 1;
retval.rem -= d;
}
return (retval);
}

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test/libc/fmt/imaxdiv_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Hugues Morisset │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/conv.h"
#include "libc/limits.h"
#include "libc/testlib/testlib.h"
TEST(imaxdiv, test) {
imaxdiv_t res;
res = imaxdiv(-5, 3);
EXPECT_EQ(-1, res.quot);
EXPECT_EQ(-2, res.rem);
res = imaxdiv(1, 1);
EXPECT_EQ(1, res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(20, 10);
EXPECT_EQ(2, res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(20, 11);
EXPECT_EQ(1, res.quot);
EXPECT_EQ(9, res.rem);
res = imaxdiv(-20, -11);
EXPECT_EQ(1, res.quot);
EXPECT_EQ(-9, res.rem);
res = imaxdiv(0, -11);
EXPECT_EQ(0, res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(0, 11);
EXPECT_EQ(0, res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(INT64_MIN, 1);
EXPECT_EQ(INT64_MIN, res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(INT64_MAX, -1);
EXPECT_EQ(-(INT64_MAX), res.quot);
EXPECT_EQ(0, res.rem);
res = imaxdiv(2387, 348);
EXPECT_EQ(6, res.quot);
EXPECT_EQ(299, res.rem);
}