mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
75e161b27b
Cosmopolitan's printf-family functions currently very poorly handle
being passed a long double infinity.
For instance, a program such as:
```cpp
#include <stdio.h>
int main()
{
printf("%f\n", 1.0 / 0.0);
printf("%Lf\n", 1.0L / 0.0L);
printf("%e\n", 1.0 / 0.0);
printf("%Le\n", 1.0L / 0.0L);
printf("%g\n", 1.0 / 0.0);
printf("%Lg\n", 1.0L / 0.0L);
}
```
will currently output the following:
```
inf
0.000000[followed by 32763 more zeros]
inf
N.aN0000e-32769
inf
N.aNe-32769
```
when the correct expected output would be:
```
inf
inf
inf
inf
inf
inf
```
This patch fixes this, and adds tests for the behavior.
73 lines
3 KiB
C
73 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Gabriel Ravier │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/testlib/testlib.h"
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TEST(snprintf, testVeryLargePrecision) {
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char buf[512] = {};
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int i = snprintf(buf, sizeof(buf), "%.9999u", 10);
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ASSERT_EQ(i, 9999);
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ASSERT_EQ(strlen(buf), 511);
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}
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TEST(snprintf, testPlusFlagOnChar) {
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char buf[10] = {};
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int i = snprintf(buf, sizeof(buf), "%+c", '=');
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ASSERT_EQ(i, 1);
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ASSERT_STREQ(buf, "=");
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}
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TEST(snprintf, testInf) {
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char buf[10] = {};
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int i = snprintf(buf, sizeof(buf), "%f", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Lf", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%e", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Le", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%g", 1.0 / 0.0);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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memset(buf, 0, 4);
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i = snprintf(buf, sizeof(buf), "%Lg", 1.0L / 0.0L);
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ASSERT_EQ(i, 3);
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ASSERT_STREQ(buf, "inf");
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for (i = 4; i < 10; ++i)
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ASSERT_EQ(buf[i], '\0');
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}
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