Mercurial > gnulib
view doc/posix-functions/ctime_r.texi @ 39913:73d60b1f9c96
doc: Update for Solaris 11.4.
* doc/**/*.texi: For bugs that exist in both Solaris 11.3 and 11.4,
mention Solaris 11.4.
* m4/printf.m4: Update comments about Solaris.
* m4/log.m4: Likewise.
* m4/log10.m4: Likewise.
* m4/logb.m4: Likewise.
* m4/logbf.m4: Likewise.
* m4/logbl.m4: Likewise.
* m4/rename.m4: Likewise.
* m4/wcrtomb.m4: Likewise.
* m4/hostent.m4: Likewise.
* m4/servent.m4: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sun, 14 Oct 2018 09:33:46 +0200 |
parents | 11af6bbd6df5 |
children |
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@node ctime_r @section @code{ctime_r} @findex ctime_r POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ctime_r.html} Gnulib module: extensions Portability problems fixed by Gnulib: @itemize @item This function has an incompatible declaration on some platforms: Solaris 11.4 (when @code{_POSIX_PTHREAD_SEMANTICS} is not defined). @end itemize Portability problems not fixed by Gnulib: @itemize @item This function is missing on some platforms: mingw, MSVC 14. @item This function may put more than 26 bytes into the argument buffer if an invalid year is passed. @end itemize @code{ctime_r} takes a pre-allocated buffer and length of the buffer, and returns @code{NULL} on errors. The input buffer should be at least 26 bytes in size. The output string is locale-independent. However, years can have more than 4 digits if @code{time_t} is sufficiently wide, so the length of the required output buffer is not easy to determine. Increasing the buffer size when @code{ctime_r} returns @code{NULL} is not necessarily sufficient. The @code{NULL} return value could mean some other error condition, which will not go away by increasing the buffer size. A more flexible function is @code{strftime}. However, note that it is locale dependent.