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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:39:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 17:39:29 +0000 |
commit | 8ffec2a3aba6f114784e11f89ef1d57a096ae540 (patch) | |
tree | ccebcbad06203e8241a8e7249f8e6c478a3682ea /gnulib-tests/timespec-sub.c | |
parent | Initial commit. (diff) | |
download | coreutils-8ffec2a3aba6f114784e11f89ef1d57a096ae540.tar.xz coreutils-8ffec2a3aba6f114784e11f89ef1d57a096ae540.zip |
Adding upstream version 8.32.upstream/8.32upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gnulib-tests/timespec-sub.c')
-rw-r--r-- | gnulib-tests/timespec-sub.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/gnulib-tests/timespec-sub.c b/gnulib-tests/timespec-sub.c new file mode 100644 index 0000000..ee827a7 --- /dev/null +++ b/gnulib-tests/timespec-sub.c @@ -0,0 +1,65 @@ +/* Subtract two struct timespec values. + + Copyright (C) 2011-2020 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. */ + +/* Return the difference between two timespec values A and B. On + overflow, return an extremal value. This assumes 0 <= tv_nsec < + TIMESPEC_HZ. */ + +#include <config.h> +#include "timespec.h" + +#include "intprops.h" + +struct timespec +timespec_sub (struct timespec a, struct timespec b) +{ + time_t rs = a.tv_sec; + time_t bs = b.tv_sec; + int ns = a.tv_nsec - b.tv_nsec; + int rns = ns; + + if (ns < 0) + { + rns = ns + TIMESPEC_HZ; + time_t bs1; + if (!INT_ADD_WRAPV (bs, 1, &bs1)) + bs = bs1; + else if (- TYPE_SIGNED (time_t) < rs) + rs--; + else + goto low_overflow; + } + + if (INT_SUBTRACT_WRAPV (rs, bs, &rs)) + { + if (0 < bs) + { + low_overflow: + rs = TYPE_MINIMUM (time_t); + rns = 0; + } + else + { + rs = TYPE_MAXIMUM (time_t); + rns = TIMESPEC_HZ - 1; + } + } + + return make_timespec (rs, rns); +} |