add mkstemps

[Eric Blake]

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The ability to have an arbitrary file suffix on a temporary file is quite
useful for programs that react to a file's extension; in fact, git wants
to use mk[s]temps when available, even though no standards bodies have
adopted it yet.  According to google, mkstemps is available on several
systems (sometimes by the more confusing name mktemps), but there is no
consistency on whether it should be in <stdlib.h> or <unistd.h>.  I went
with <stdlib.h>, since that is where POSIX puts mkstemp.  This also fixes
the documentation (mktemp is NOT in <stdio.h>), but does not move the
files to a more appropriate subdirectory.

OK to apply?

2009-06-27  Eric Blake  <ebb9@byu.net>

	Add mkstemps.
	* libc/stdio/mktemp.c: Fix documentation.
	(_gettemp): Add length parameter.
	(_mkstemp_r, _mktemp_r, mkstemp, mktemp): Adjust clients.
	(_mkstemps_r, mkstemps): New functions.
	* libc/include/stdlib.h (_mkstemps_r, mkstemps): Declare them.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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