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Diffstat (limited to 'src/gl/tests/test-timespec.c')
| -rw-r--r-- | src/gl/tests/test-timespec.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/src/gl/tests/test-timespec.c b/src/gl/tests/test-timespec.c new file mode 100644 index 0000000..4af9f83 --- /dev/null +++ b/src/gl/tests/test-timespec.c @@ -0,0 +1,167 @@ +/* Test timespec functions. + Copyright 2015-2021 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ + +/* Written by Paul Eggert. */ + +#include <config.h> + +#include "timespec.h" + +#include "intprops.h" +#include "macros.h" + +#include <stdbool.h> +#include <limits.h> + +static struct { int s; int ns; } const prototype[] = + { + { INT_MIN, 0 }, + { INT_MIN, 1 }, + { INT_MIN, TIMESPEC_HZ - 1 }, + { INT_MIN + 1, 0 }, + { INT_MIN + 1, 1 }, + { INT_MIN + 1, TIMESPEC_HZ - 1 }, + { -1, 0 }, + { -1, 1 }, + { -1, TIMESPEC_HZ - 1 }, + { 0, 0 }, + { 0, 1 }, + { 0, TIMESPEC_HZ - 1 }, + { 1, 0 }, + { 1, 1 }, + { 1, TIMESPEC_HZ - 1 }, + { 1234567890, 0 }, + { 1234567890, 1 }, + { 1234567890, TIMESPEC_HZ - 1 }, + { INT_MAX - 1, 0 }, + { INT_MAX - 1, 1 }, + { INT_MAX - 1, TIMESPEC_HZ - 1 }, + { INT_MAX, 0 }, + { INT_MAX, 1 }, + { INT_MAX, TIMESPEC_HZ - 1 }, + { INT_MAX, 2 * TIMESPEC_HZ } + }; +enum { nprototypes = sizeof prototype / sizeof *prototype }; + +static bool +valid (struct timespec a) +{ + return 0 <= a.tv_nsec && a.tv_nsec < TIMESPEC_HZ; +} + +static int +sign (int i) +{ + return i < 0 ? -1 : 0 < i; +} + +static int +cmp (struct timespec a, struct timespec b) +{ + return sign (timespec_cmp (a, b)); +} + +static bool +eq (struct timespec a, struct timespec b) +{ + return timespec_cmp (a, b) == 0; +} + +static bool +extremal (struct timespec a) +{ + return ((a.tv_sec == TYPE_MINIMUM (time_t) && a.tv_nsec == 0) + || (a.tv_sec == TYPE_MAXIMUM (time_t) + && a.tv_nsec == TIMESPEC_HZ - 1)); +} + +int +main (void) +{ + int i, j, k; + struct timespec test[nprototypes + 1]; + int ntests; + int computed_hz = 1; + struct timespec prevroundtrip; + + test[0] = make_timespec (TYPE_MINIMUM (time_t), -1); + ntests = 1; + for (i = 0; i < nprototypes; i++) + { + int s = prototype[i].s; + if (TYPE_SIGNED (time_t) || 0 <= s) + { + time_t t = (s <= INT_MIN + 1 ? s - INT_MIN + TYPE_MINIMUM (time_t) + : INT_MAX - 1 <= s ? s - INT_MAX + TYPE_MAXIMUM (time_t) + : s); + test[ntests++] = make_timespec (t, prototype[i].ns); + } + } + + for (i = 0; i < LOG10_TIMESPEC_HZ; i++) + computed_hz *= 10; + ASSERT (computed_hz == TIMESPEC_HZ); + + for (i = 0; i < ntests; i++) + { + struct timespec a = test[i]; + + struct timespec roundtrip = dtotimespec (timespectod (a)); + if (i != 0) + ASSERT (cmp (prevroundtrip, roundtrip) <= 0); + prevroundtrip = roundtrip; + + ASSERT (sign (timespec_sign (a)) == cmp (a, make_timespec (0, 0))); + + if (valid (a)) + for (j = 0; j < ntests; j++) + { + struct timespec b = test[j]; + if (valid (b)) + { + struct timespec sum = timespec_add (a, b); + struct timespec diff = timespec_sub (a, b); + struct timespec rdiff = timespec_sub (b, a); + ASSERT (cmp (a, b) == sign (i - j)); + ASSERT (eq (sum, timespec_add (b, a))); + if (! extremal (sum)) + { + ASSERT (eq (a, timespec_sub (sum, b))); + ASSERT (eq (b, timespec_sub (sum, a))); + + for (k = 0; k < ntests; k++) + { + struct timespec c = test[k]; + if (valid (c)) + { + struct timespec sumbc = timespec_add (b, c); + if (! extremal (sumbc)) + ASSERT (eq (timespec_add (a, sumbc), + timespec_add (sum, c))); + } + } + } + if (! extremal (diff)) + ASSERT (eq (a, timespec_add (diff, b))); + if (! extremal (rdiff)) + ASSERT (eq (b, timespec_add (rdiff, a))); + + } + } + } + + return 0; +} |