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/plot/util/private/__gnuplot_print__.m
+++ b/scripts/plot/util/private/__gnuplot_print__.m
@@ -54,7 +54,7 @@
         gp_opts = [gp_opts " level1"];
       endif
       if (opts.tight_flag || ! isempty (opts.preview))
-        tmp_file = strcat (tmpnam (), ".eps");
+        tmp_file = [tempname() ".eps"];
         eps_drawnow (opts, tmp_file, gp_opts);
         if (dos_shell)
           cleanup = [" & del " strrep(tmp_file, '/', '\')];
@@ -119,7 +119,7 @@
     case opts.ghostscript.device
       gp_opts = font_spec (opts, "devopt", "eps");
       opts.ghostscript.output = opts.name;
-      opts.ghostscript.source = strcat (tmpnam (), ".eps");
+      opts.ghostscript.source = [tempname() ".eps"];
       eps_drawnow (opts, opts.ghostscript.source, gp_opts);
       [cmd_gs, cmd_cleanup] = __ghostscript__ (opts.ghostscript);
       if (opts.send_to_printer || isempty (opts.name))