- gchar *basename;
- gchar *filename = NULL;
-
- do {
- if (filename != NULL)
- g_free (filename);
-
- basename = g_strdup_printf ("%s-%d",
- prefix ? prefix : "document",
- count ++);
-
- filename = g_build_filename (ev_tmp_dir (),
- basename, NULL);
-
- g_free (basename);
- } while (g_file_test (filename, G_FILE_TEST_EXISTS));
-
- return filename;
+ static const char letters[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+ static const int NLETTERS = sizeof (letters) - 1;
+ static int counter = 0;
+ char *XXXXXX;
+ GTimeVal tv;
+ glong value;
+ int count;
+
+ /* find the last occurrence of "XXXXXX" */
+ XXXXXX = g_strrstr (tmpl, "XXXXXX");
+
+ if (!XXXXXX || strncmp (XXXXXX, "XXXXXX", 6))
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ /* Get some more or less random data. */
+ g_get_current_time (&tv);
+ value = (tv.tv_usec ^ tv.tv_sec) + counter++;
+
+ for (count = 0; count < 100; value += 7777, ++count)
+ {
+ glong v = value;
+
+ /* Fill in the random bits. */
+ XXXXXX[0] = letters[v % NLETTERS];
+ v /= NLETTERS;
+ XXXXXX[1] = letters[v % NLETTERS];
+ v /= NLETTERS;
+ XXXXXX[2] = letters[v % NLETTERS];
+ v /= NLETTERS;
+ XXXXXX[3] = letters[v % NLETTERS];
+ v /= NLETTERS;
+ XXXXXX[4] = letters[v % NLETTERS];
+ v /= NLETTERS;
+ XXXXXX[5] = letters[v % NLETTERS];
+
+ /* tmpl is in UTF-8 on Windows, thus use g_mkdir() */
+ if (g_mkdir (tmpl, 0700) == 0)
+ return tmpl;
+
+ if (errno != EEXIST)
+ /* Any other error will apply also to other names we might
+ * try, and there are 2^32 or so of them, so give up now.
+ */
+ return NULL;
+ }
+
+ /* We got out of the loop because we ran out of combinations to try. */
+ errno = EEXIST;
+ return NULL;