Use tempname() rather than tmpnam() in core Octave. * scripts/miscellaneous/tempname.m: Removed m-file as function is now C++. * scripts/miscellaneous/tmpnam.m: New m-file is an alias that calls tempname. * scripts/miscellaneous/module.mk: Add tmpnam.m to build system. * io.txi: Place tempname, tempdir, P_tmpdir docstrings in section on temporary files. * system.txi: Remove tempname, tempdir, P_tmpdir docstrings from generic system functions section of manual. * dirfns.cc, dlmread.cc, md5sum.cc, ov-fcn-handle.cc: Replace instances of tmpnam with tempname in BIST code. * file-io.cc (Ftempname): Change DEFUNX for tmpnam to DEFUN for tempname. Remove seealso links to tmpnam. * ftp.m, playaudio.m, wavwrite.m, imformats.m, imread.m, imwrite.m, imageIO.m, csvwrite.m, dlmwrite.m, fileread.m, importdata.m, textread.m, textscan.m, genvarname.m, unpack.m, install.m, legend.m, __gnuplot_drawnow__.m, copyobj.m, hgsave.m, print.m, __ghostscript__.m, __gnuplot_get_var__.m, __gnuplot_ginput__.m, __gnuplot_print__.m: Replace tmpnam with tempname in core code. * build-sparse-tests.sh, io.tst, prefer.tst, system.tst: Replace tmpnam with tempname in test code.

--- a/scripts/image/imformats.m	Tue Oct 21 14:37:44 2014 -0400
+++ b/scripts/image/imformats.m	Wed Oct 22 10:41:15 2014 -0700
@@ -286,7 +286,7 @@
 
 ## changing the function that does the reading
 %!testif HAVE_MAGICK
-%! fname = [tmpnam() ".jpg"];
+%! fname = [tempname() ".jpg"];
 %! def_fmt = imformats ();
 %! fid = fopen (fname, "w");
 %! unwind_protect
@@ -302,7 +302,7 @@
 
 ## adding a new format
 %!testif HAVE_MAGICK
-%! fname = [tmpnam() ".new_fmt"];
+%! fname = [tempname() ".new_fmt"];
 %! def_fmt = imformats ();
 %! fid = fopen (fname, "w");
 %! unwind_protect
@@ -319,9 +319,9 @@
 
 ## adding multiple formats at the same time
 %!testif HAVE_MAGICK
-%! fname1 = [tmpnam() ".new_fmt1"];
+%! fname1 = [tempname() ".new_fmt1"];
 %! fid1 = fopen (fname1, "w");
-%! fname2 = [tmpnam() ".new_fmt2"];
+%! fname2 = [tempname() ".new_fmt2"];
 %! fid2 = fopen (fname2, "w");
 %! def_fmt = imformats ();
 %! unwind_protect