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| author | Paul Eggert <eggert@cs.ucla.edu> | 2018-03-26 19:23:33 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2018-03-27 13:23:16 -0700 |
| commit | 96caee5e9a16b172611c6ead9df0ab39cb7acfa6 (patch) | |
| tree | f8a99595f3b73c50bfa8d1444a5b29f0cb4d4d91 /lib/time_rz.c | |
| parent | 8326a2e524119decf07d07a072a6c15bebefef0e (diff) | |
| download | gnulib-96caee5e9a16b172611c6ead9df0ab39cb7acfa6.tar.gz | |
time_rz: work around Mac OS X 10.6 infloop
* doc/posix-functions/localtime.texi:
* doc/posix-functions/localtime_r.texi: Mention the bug.
* lib/time_rz.c (localtime_rz): Work around the bug. It’d be
better to fix localtime and localtime_r instead, but that would be
more work and is not needed to fix the Emacs problem.
* m4/time_rz.m4 (gl_TIME_RZ): Detect the bug.
Diffstat (limited to 'lib/time_rz.c')
| -rw-r--r-- | lib/time_rz.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/time_rz.c b/lib/time_rz.c index 4682beb573..f9262c1720 100644 --- a/lib/time_rz.c +++ b/lib/time_rz.c @@ -286,6 +286,21 @@ revert_tz (timezone_t tz) struct tm * localtime_rz (timezone_t tz, time_t const *t, struct tm *tm) { +#ifdef HAVE_LOCALTIME_INFLOOP_BUG + /* The -67768038400665599 comes from: + https://lists.gnu.org/r/bug-gnulib/2017-07/msg00142.html + On affected platforms the greatest POSIX-compatible time_t value + that could return nonnull is 67768036191766798 (when + TZ="XXX24:59:59" it resolves to the year 2**31 - 1 + 1900, on + 12-31 at 23:59:59), so test for that too while we're in the + neighborhood. */ + if (! (-67768038400665599 <= *t && *t <= 67768036191766798)) + { + errno = EOVERFLOW; + return NULL; + } +#endif + if (!tz) return gmtime_r (t, tm); else |