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annotate doc/posix-functions/ctime_r.texi @ 13267:d6ab91053834

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Use the 'extensions' module for some more functions on Solaris.
author Bruno Haible <bruno@clisp.org>
date Sun, 25 Apr 2010 23:08:38 +0200
parents d12a380d8ac1
children bb0ceefd22dc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
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1 @node ctime_r
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2 @section @code{ctime_r}
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3 @findex ctime_r
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4
10876
c83dc7e8df57 Refer to new POSIX:2008 standard.
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5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ctime_r.html}
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6
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7 Gnulib module: extensions
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @item
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12 This function has an incompatible declaration on some platforms:
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13 Solaris 10 (when @code{_POSIX_PTHREAD_SEMANTICS} is not defined).
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14 @end itemize
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15
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16 Portability problems not fixed by Gnulib:
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17 @itemize
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18 @item
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19 This function is missing on some platforms:
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20 mingw.
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21 @item
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22 This function may put more than 26 bytes into the argument buffer if an
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23 invalid year is passed.
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24 @end itemize
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25
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26 @code{ctime_r} takes a pre-allocated buffer and length of the buffer,
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27 and returns @code{NULL} on errors.
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28 The input buffer should be at least 26 bytes in size. The output
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29 string is locale-independent. However, years can have more than 4
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30 digits if @code{time_t} is sufficiently wide, so the length of the
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31 required output buffer is not easy to determine. Increasing the
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32 buffer size when @code{ctime_r} returns @code{NULL} is not necessarily
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33 sufficient. The @code{NULL} return value could mean some other error
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34 condition, which will not go away by increasing the buffer size.
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35
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36 A more flexible function is @code{strftime}. However, note that it is
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37 locale dependent.