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235 lines
7.3 KiB
C
235 lines
7.3 KiB
C
/* Test for correct rounding of printf floating-point output.
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Copyright (C) 2012-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <stdio.h>
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#include <string.h>
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struct dec_test {
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double d;
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const char *fmt;
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const char *rd, *rn, *rz, *ru;
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};
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static const struct dec_test dec_tests[] = {
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{ 1.5, "%.0f", "1", "2", "1", "2" },
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{ -1.5, "%.0f", "-2", "-2", "-1", "-1" },
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{ 2.5, "%.0f", "2", "2", "2", "3" },
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{ -2.5, "%.0f", "-3", "-2", "-2", "-2" },
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{ 1.4999, "%.0f", "1", "1", "1", "2" },
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{ -1.4999, "%.0f", "-2", "-1", "-1", "-1" },
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{ 1.5001, "%.0f", "1", "2", "1", "2" },
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{ -1.5001, "%.0f", "-2", "-2", "-1", "-1" },
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{ 2.4999, "%.0f", "2", "2", "2", "3" },
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{ -2.4999, "%.0f", "-3", "-2", "-2", "-2" },
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{ 2.5001, "%.0f", "2", "3", "2", "3" },
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{ -2.5001, "%.0f", "-3", "-3", "-2", "-2" },
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{ 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" },
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{ -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" },
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{ 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" },
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{ -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" },
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{ 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" },
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{ -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" },
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};
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static int
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test_dec_in_one_mode (double d, const char *fmt, const char *expected,
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const char *mode_name)
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{
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char buf[100];
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int ret = snprintf (buf, sizeof buf, fmt, d);
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if (ret <= 0 || ret >= (int) sizeof buf)
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{
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printf ("snprintf for %a returned %d\n", d, ret);
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return 1;
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}
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if (strcmp (buf, expected) == 0)
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return 0;
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else
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{
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printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n",
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fmt, d, buf, expected, mode_name);
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return 1;
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}
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}
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struct hex_test
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{
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double d;
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const char *fmt;
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const char *rd[4], *rn[4], *rz[4], *ru[4];
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};
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static const struct hex_test hex_tests[] =
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{
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{
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0x1.fffffp+4, "%.1a",
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{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
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{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" },
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{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
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{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" }
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},
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{
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-0x1.fffffp+4, "%.1a",
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{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
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{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
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{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" },
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{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" }
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},
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{
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0x1.88p+4, "%.1a",
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{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
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{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
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{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
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{ "0x1.9p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }
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},
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{
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-0x1.88p+4, "%.1a",
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{ "-0x1.9p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
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{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
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{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
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{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }
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},
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{
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0x1.78p+4, "%.1a",
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{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
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{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
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{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
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{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }
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},
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{
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-0x1.78p+4, "%.1a",
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{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
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{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
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{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
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{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }
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},
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{
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64.0 / 3.0, "%.1a",
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{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
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{ "0x1.5p+4", "0x2.bp+3", "0x5.5p+2", "0xa.bp+1" },
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{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
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{ "0x1.6p+4", "0x2.bp+3", "0x5.6p+2", "0xa.bp+1" }
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},
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{
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-64.0 / 3.0, "%.1a",
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{ "-0x1.6p+4", "-0x2.bp+3", "-0x5.6p+2", "-0xa.bp+1" },
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{ "-0x1.5p+4", "-0x2.bp+3", "-0x5.5p+2", "-0xa.bp+1" },
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{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" },
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{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" }
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},
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};
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static int
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test_hex_in_one_mode (double d, const char *fmt, const char *const expected[4],
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const char *mode_name)
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{
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char buf[100];
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int ret = snprintf (buf, sizeof buf, fmt, d);
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if (ret <= 0 || ret >= (int) sizeof buf)
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{
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printf ("snprintf for %a returned %d\n", d, ret);
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return 1;
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}
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if (strcmp (buf, expected[0]) == 0
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|| strcmp (buf, expected[1]) == 0
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|| strcmp (buf, expected[2]) == 0
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|| strcmp (buf, expected[3]) == 0)
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return 0;
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else
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{
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printf ("snprintf (\"%s\", %a) returned \"%s\" not "
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"\"%s\" or \"%s\" or \"%s\" or \"%s\" (%s)\n",
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fmt, d, buf, expected[0], expected[1], expected[2], expected[3],
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mode_name);
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return 1;
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}
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}
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static int
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do_test (void)
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{
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int save_round_mode __attribute__ ((unused)) = fegetround ();
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int result = 0;
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for (size_t i = 0; i < sizeof (dec_tests) / sizeof (dec_tests[0]); i++)
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{
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result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
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dec_tests[i].rn, "default rounding mode");
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#ifdef FE_DOWNWARD
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if (!fesetround (FE_DOWNWARD))
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{
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result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
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dec_tests[i].rd, "FE_DOWNWARD");
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fesetround (save_round_mode);
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}
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#endif
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#ifdef FE_TOWARDZERO
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if (!fesetround (FE_TOWARDZERO))
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{
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result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
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dec_tests[i].rz, "FE_TOWARDZERO");
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fesetround (save_round_mode);
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}
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#endif
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#ifdef FE_UPWARD
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if (!fesetround (FE_UPWARD))
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{
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result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
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dec_tests[i].ru, "FE_UPWARD");
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fesetround (save_round_mode);
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}
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#endif
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}
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for (size_t i = 0; i < sizeof (hex_tests) / sizeof (hex_tests[0]); i++)
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{
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result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
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hex_tests[i].rn, "default rounding mode");
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#ifdef FE_DOWNWARD
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if (!fesetround (FE_DOWNWARD))
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{
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result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
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hex_tests[i].rd, "FE_DOWNWARD");
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fesetround (save_round_mode);
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}
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#endif
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#ifdef FE_TOWARDZERO
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if (!fesetround (FE_TOWARDZERO))
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{
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result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
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hex_tests[i].rz, "FE_TOWARDZERO");
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fesetround (save_round_mode);
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}
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#endif
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#ifdef FE_UPWARD
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if (!fesetround (FE_UPWARD))
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{
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result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
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hex_tests[i].ru, "FE_UPWARD");
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fesetround (save_round_mode);
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}
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#endif
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}
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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