File glib2-add-g_canonicalize_filename.patch of Package glib2.23781

diff --unified --recursive --text glib-2.54.3.orig/glib/gtimezone.c glib-2.54.3.new/glib/gtimezone.c
--- glib-2.54.3.orig/glib/gtimezone.c	2020-11-13 09:59:04.801985507 +0800
+++ glib-2.54.3.new/glib/gtimezone.c	2020-11-13 09:59:38.365319402 +0800
@@ -193,6 +193,117 @@
                            there's no point in getting carried
                            away. */
 
+/* We don't want a ABI change so add here as static. */
+static gchar *
+g_canonicalize_filename (const gchar *filename,
+                         const gchar *relative_to)
+{
+  gchar *canon, *start, *p, *q;
+  guint i;
+
+  g_return_val_if_fail (relative_to == NULL || g_path_is_absolute (relative_to), NULL);
+
+  if (!g_path_is_absolute (filename))
+    {
+      gchar *cwd_allocated = NULL;
+      const gchar  *cwd;
+
+      if (relative_to != NULL)
+        cwd = relative_to;
+      else
+        cwd = cwd_allocated = g_get_current_dir ();
+
+      canon = g_build_filename (cwd, filename, NULL);
+      g_free (cwd_allocated);
+    }
+  else
+    {
+      canon = g_strdup (filename);
+    }
+
+  start = (char *)g_path_skip_root (canon);
+
+  if (start == NULL)
+    {
+      /* This shouldn't really happen, as g_get_current_dir() should
+         return an absolute pathname, but bug 573843 shows this is
+         not always happening */
+      g_free (canon);
+      return g_build_filename (G_DIR_SEPARATOR_S, filename, NULL);
+    }
+
+  /* POSIX allows double slashes at the start to
+   * mean something special (as does windows too).
+   * So, "//" != "/", but more than two slashes
+   * is treated as "/".
+   */
+  i = 0;
+  for (p = start - 1;
+       (p >= canon) &&
+         G_IS_DIR_SEPARATOR (*p);
+       p--)
+    i++;
+  if (i > 2)
+    {
+      i -= 1;
+      start -= i;
+      memmove (start, start+i, strlen (start+i) + 1);
+    }
+
+  /* Make sure we're using the canonical dir separator */
+  p++;
+  while (p < start && G_IS_DIR_SEPARATOR (*p))
+    *p++ = G_DIR_SEPARATOR;
+
+  p = start;
+  while (*p != 0)
+    {
+      if (p[0] == '.' && (p[1] == 0 || G_IS_DIR_SEPARATOR (p[1])))
+        {
+          memmove (p, p+1, strlen (p+1)+1);
+        }
+      else if (p[0] == '.' && p[1] == '.' && (p[2] == 0 || G_IS_DIR_SEPARATOR (p[2])))
+        {
+          q = p + 2;
+          /* Skip previous separator */
+          p = p - 2;
+          if (p < start)
+            p = start;
+          while (p > start && !G_IS_DIR_SEPARATOR (*p))
+            p--;
+          if (G_IS_DIR_SEPARATOR (*p))
+            *p++ = G_DIR_SEPARATOR;
+          memmove (p, q, strlen (q)+1);
+        }
+      else
+        {
+          /* Skip until next separator */
+          while (*p != 0 && !G_IS_DIR_SEPARATOR (*p))
+            p++;
+
+          if (*p != 0)
+            {
+              /* Canonicalize one separator */
+              *p++ = G_DIR_SEPARATOR;
+            }
+        }
+
+      /* Remove additional separators */
+      q = p;
+      while (*q && G_IS_DIR_SEPARATOR (*q))
+        q++;
+
+      if (p != q)
+        memmove (p, q, strlen (q) + 1);
+    }
+
+  /* Remove trailing slashes */
+  if (p > start && G_IS_DIR_SEPARATOR (*(p-1)))
+    *(p-1) = 0;
+
+  return canon;
+}
+
 /**
  * g_time_zone_unref:
  * @tz: a #GTimeZone