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-rw-r--r--REORG.TODO/stdio-common/tst-printf-round.c234
1 files changed, 234 insertions, 0 deletions
diff --git a/REORG.TODO/stdio-common/tst-printf-round.c b/REORG.TODO/stdio-common/tst-printf-round.c
new file mode 100644
index 0000000000..e0073f2856
--- /dev/null
+++ b/REORG.TODO/stdio-common/tst-printf-round.c
@@ -0,0 +1,234 @@
+/* Test for correct rounding of printf floating-point output.
+ Copyright (C) 2012-2017 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"
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