/* Test for correct rounding of printf floating-point output. Copyright (C) 2012-2015 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"