r.terraflow: use GRASS .tmp dir for temp data

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@49785 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.terraflow/main.cpp

@@ -131,11 +131,7 @@ parse_args(int argc, char *argv[]) {
   streamdir->key        = "stream_dir";
   streamdir->type       = TYPE_STRING;
   streamdir->required   = NO;
-#ifdef __MINGW32__
-  streamdir->answer     = G_convert_dirseps_from_host(G_store(getenv("TEMP")));
-#else
-  streamdir->answer     = G_store("/var/tmp/");
-#endif
+  //streamdir->answer     = "";
   streamdir->description=
      _("Directory to hold temporary files (they can be large)");
 
@@ -172,7 +168,15 @@ parse_args(int argc, char *argv[]) {
   }
 
   opt->mem = atoi(mem->answer);
-  opt->streamdir = streamdir->answer;
+  if (!streamdir->answer) {
+    const char *tmpdir = G_tempfile();
+    
+    if (G_mkdir(tmpdir) == -1)
+	G_fatal_error(_("Unable to create temp dir"));
+    opt->streamdir = G_store(tmpdir);
+  }
+  else
+    opt->streamdir = streamdir->answer;
 
   opt->verbose = G_verbose() == G_verbose_max();