Replace mkdtemp() with _ev_g_mkdtemp().

The function mkdtemp() is not available on Windows. Unfortunately,
glib does not have a portable replacement for it yet, see
http://bugzilla.gnome.org/show_bug.cgi?id=524831. This patch copies
a proposed implementation for g_mkdtemp() from that bug
report (renamed to _ev_g_mkdtemp()). Fixes bgo#604917.

diff --git a/libdocument/ev-file-helpers.c b/libdocument/ev-file-helpers.c
index 3845519f67c2cbcb7184e1e639cb1b3fa9dc5615..01bf089ef4910447df92859c7d00499de7d0a0ea 100644 (file)
--- a/libdocument/ev-file-helpers.c
+++ b/libdocument/ev-file-helpers.c
@@ -195,6 +195,91 @@ ev_mkstemp_file (const char        *template,
         return file;
 }
 
+/**
+ * This function is copied from
+ * http://bugzilla.gnome.org/show_bug.cgi?id=524831
+ * and renamed from g_mkdtemp to _ev_g_mkdtemp.
+ *
+ * If/when this function gets added to glib, it can be removed from
+ * evince' sources.
+ *
+ *
+ * g_mkdtemp:
+ * @tmpl: template directory name
+ *
+ * Creates a temporary directory. See the mkdtemp() documentation
+ * on most UNIX-like systems.
+ *
+ * The parameter is a string that should follow the rules for
+ * mkdtemp() templates, i.e. contain the string "XXXXXX".  g_mkdtemp()
+ * is slightly more flexible than mkdtemp() in that the sequence does
+ * not have to occur at the very end of the template. The X string
+ * will be modified to form the name of a directory that didn't
+ * already exist.  The string should be in the GLib file name
+ * encoding. Most importantly, on Windows it should be in UTF-8.
+ *
+ * Return value: If a temporary directory was successfully created,
+ * @tmpl will be returned with the XXXXXX string modified in such a
+ * way as to make the path unique.  In case of errors, %NULL is
+ * returned.
+ */
+static gchar *
+_ev_g_mkdtemp (gchar *tmpl)
+{
+  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;
+}
+
 /**
  * ev_mkdtemp:
  * @template: a template string; must end in 'XXXXXX'
@@ -216,7 +301,7 @@ ev_mkdtemp (const char        *template,
               return NULL;
 
         name = g_build_filename (tmp, template, NULL);
-        if (mkdtemp (name) == NULL) {
+        if (_ev_g_mkdtemp (name) == NULL) {
                int errsv = errno;
 
                 g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errsv),