1 files changed, 47 insertions, 0 deletions
diff --git a/stdio/reg-printf.c b/stdio/reg-printf.c
new file mode 100644
index 0000000000..95d7a1f3c9
--- /dev/null
+++ b/stdio/reg-printf.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <limits.h>
+#include <printf.h>
+
+/* Array of functions indexed by format character.  */
+static printf_function *printf_funcs[UCHAR_MAX + 1];
+printf_arginfo_function *__printf_arginfo_table[UCHAR_MAX + 1];
+
+printf_function **__printf_function_table;
+
+/* Register FUNC to be called to format SPEC specifiers.  */
+int
+DEFUN(register_printf_function, (spec, converter, arginfo),
+      int spec AND printf_function converter AND
+      printf_arginfo_function arginfo)
+{
+  if (spec < 0 || spec > (int) UCHAR_MAX)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  __printf_function_table = printf_funcs;
+  __printf_arginfo_table[spec] = arginfo;
+  printf_funcs[spec] = converter;
+
+  return 0;
+}