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glibc/stdio-common/tst-printf-round.c
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/* Test for correct rounding of printf floating-point output. | |
Copyright (C) 2012-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <fenv.h> | |
#include <stdio.h> | |
#include <string.h> | |
struct dec_test { | |
double d; | |
const char *fmt; | |
const char *rd, *rn, *rz, *ru; | |
}; | |
static const struct dec_test dec_tests[] = { | |
{ 1.5, "%.0f", "1", "2", "1", "2" }, | |
{ -1.5, "%.0f", "-2", "-2", "-1", "-1" }, | |
{ 2.5, "%.0f", "2", "2", "2", "3" }, | |
{ -2.5, "%.0f", "-3", "-2", "-2", "-2" }, | |
{ 1.4999, "%.0f", "1", "1", "1", "2" }, | |
{ -1.4999, "%.0f", "-2", "-1", "-1", "-1" }, | |
{ 1.5001, "%.0f", "1", "2", "1", "2" }, | |
{ -1.5001, "%.0f", "-2", "-2", "-1", "-1" }, | |
{ 2.4999, "%.0f", "2", "2", "2", "3" }, | |
{ -2.4999, "%.0f", "-3", "-2", "-2", "-2" }, | |
{ 2.5001, "%.0f", "2", "3", "2", "3" }, | |
{ -2.5001, "%.0f", "-3", "-3", "-2", "-2" }, | |
{ 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" }, | |
{ -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" }, | |
{ 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" }, | |
{ -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" }, | |
{ 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" }, | |
{ -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" }, | |
}; | |
static int | |
test_dec_in_one_mode (double d, const char *fmt, const char *expected, | |
const char *mode_name) | |
{ | |
char buf[100]; | |
int ret = snprintf (buf, sizeof buf, fmt, d); | |
if (ret <= 0 || ret >= (int) sizeof buf) | |
{ | |
printf ("snprintf for %a returned %d\n", d, ret); | |
return 1; | |
} | |
if (strcmp (buf, expected) == 0) | |
return 0; | |
else | |
{ | |
printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n", | |
fmt, d, buf, expected, mode_name); | |
return 1; | |
} | |
} | |
struct hex_test | |
{ | |
double d; | |
const char *fmt; | |
const char *rd[4], *rn[4], *rz[4], *ru[4]; | |
}; | |
static const struct hex_test hex_tests[] = | |
{ | |
{ | |
0x1.fffffp+4, "%.1a", | |
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" }, | |
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" }, | |
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" }, | |
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" } | |
}, | |
{ | |
-0x1.fffffp+4, "%.1a", | |
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" }, | |
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" }, | |
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" }, | |
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" } | |
}, | |
{ | |
0x1.88p+4, "%.1a", | |
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }, | |
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }, | |
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }, | |
{ "0x1.9p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" } | |
}, | |
{ | |
-0x1.88p+4, "%.1a", | |
{ "-0x1.9p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }, | |
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }, | |
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }, | |
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" } | |
}, | |
{ | |
0x1.78p+4, "%.1a", | |
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }, | |
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }, | |
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }, | |
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" } | |
}, | |
{ | |
-0x1.78p+4, "%.1a", | |
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }, | |
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }, | |
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }, | |
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" } | |
}, | |
{ | |
64.0 / 3.0, "%.1a", | |
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" }, | |
{ "0x1.5p+4", "0x2.bp+3", "0x5.5p+2", "0xa.bp+1" }, | |
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" }, | |
{ "0x1.6p+4", "0x2.bp+3", "0x5.6p+2", "0xa.bp+1" } | |
}, | |
{ | |
-64.0 / 3.0, "%.1a", | |
{ "-0x1.6p+4", "-0x2.bp+3", "-0x5.6p+2", "-0xa.bp+1" }, | |
{ "-0x1.5p+4", "-0x2.bp+3", "-0x5.5p+2", "-0xa.bp+1" }, | |
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" }, | |
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" } | |
}, | |
}; | |
static int | |
test_hex_in_one_mode (double d, const char *fmt, const char *const expected[4], | |
const char *mode_name) | |
{ | |
char buf[100]; | |
int ret = snprintf (buf, sizeof buf, fmt, d); | |
if (ret <= 0 || ret >= (int) sizeof buf) | |
{ | |
printf ("snprintf for %a returned %d\n", d, ret); | |
return 1; | |
} | |
if (strcmp (buf, expected[0]) == 0 | |
|| strcmp (buf, expected[1]) == 0 | |
|| strcmp (buf, expected[2]) == 0 | |
|| strcmp (buf, expected[3]) == 0) | |
return 0; | |
else | |
{ | |
printf ("snprintf (\"%s\", %a) returned \"%s\" not " | |
"\"%s\" or \"%s\" or \"%s\" or \"%s\" (%s)\n", | |
fmt, d, buf, expected[0], expected[1], expected[2], expected[3], | |
mode_name); | |
return 1; | |
} | |
} | |
static int | |
do_test (void) | |
{ | |
int save_round_mode __attribute__ ((unused)) = fegetround (); | |
int result = 0; | |
for (size_t i = 0; i < sizeof (dec_tests) / sizeof (dec_tests[0]); i++) | |
{ | |
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
dec_tests[i].rn, "default rounding mode"); | |
#ifdef FE_DOWNWARD | |
if (!fesetround (FE_DOWNWARD)) | |
{ | |
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
dec_tests[i].rd, "FE_DOWNWARD"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
#ifdef FE_TOWARDZERO | |
if (!fesetround (FE_TOWARDZERO)) | |
{ | |
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
dec_tests[i].rz, "FE_TOWARDZERO"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
#ifdef FE_UPWARD | |
if (!fesetround (FE_UPWARD)) | |
{ | |
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt, | |
dec_tests[i].ru, "FE_UPWARD"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
} | |
for (size_t i = 0; i < sizeof (hex_tests) / sizeof (hex_tests[0]); i++) | |
{ | |
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt, | |
hex_tests[i].rn, "default rounding mode"); | |
#ifdef FE_DOWNWARD | |
if (!fesetround (FE_DOWNWARD)) | |
{ | |
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt, | |
hex_tests[i].rd, "FE_DOWNWARD"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
#ifdef FE_TOWARDZERO | |
if (!fesetround (FE_TOWARDZERO)) | |
{ | |
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt, | |
hex_tests[i].rz, "FE_TOWARDZERO"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
#ifdef FE_UPWARD | |
if (!fesetround (FE_UPWARD)) | |
{ | |
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt, | |
hex_tests[i].ru, "FE_UPWARD"); | |
fesetround (save_round_mode); | |
} | |
#endif | |
} | |
return result; | |
} | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" |