+ len = strlen (filename);
+
+ if (filename[len-- - 1] == '.')
+ return (0);
+
+ while ((len > 0) && (filename[len - 1] != '.'))
+ if (filename[len - 1] == '/')
+ return (0);
+ else
+ len--;
+
+ return (len - 1);
+}
+
+/* Computes extensions from the grammar file extension. */
+static void
+compute_exts_from_gf(const char *ext)
+{
+ src_extension = tr(ext, 'y', 'c');
+ src_extension = tr(src_extension, 'Y', 'C');
+ header_extension = tr(ext, 'y', 'h');
+ header_extension = tr(header_extension, 'Y', 'H');
+}
+
+/* Computes extensions from the given c source file extension. */
+static void
+compute_exts_from_src(const char *ext)
+{
+ src_extension = xstrdup(ext);
+ header_extension = tr(ext, 'c', 'h');
+ header_extension = tr(header_extension, 'C', 'H');
+}