Adding upstream version 3.0.4.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

plug-ins/script-fu/libscriptfu/script-fu-utils.c

@@ -0,0 +1,69 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <glib.h>
+
+#include "script-fu-utils.h"
+
+
+/*
+ * Escapes the special characters '\b', '\f', '\n', '\r', '\t', '\' and '"'
+ * in the string source by inserting a '\' before them.
+ */
+gchar *
+script_fu_strescape (const gchar *source)
+{
+  const guchar *p;
+  gchar        *dest;
+  gchar        *q;
+
+  g_return_val_if_fail (source != NULL, NULL);
+
+  p = (const guchar *) source;
+
+  /* Each source byte needs maximally two destination chars */
+  q = dest = g_malloc (strlen (source) * 2 + 1);
+
+  while (*p)
+    {
+      switch (*p)
+        {
+        case '\b':
+        case '\f':
+        case '\n':
+        case '\r':
+        case '\t':
+        case '\\':
+        case '"':
+          *q++ = '\\';
+          /* fallthrough */
+        default:
+          *q++ = *p;
+          break;
+        }
+
+      p++;
+    }
+
+  *q = 0;
+
+  return dest;
+}