1 files changed, 29 insertions, 0 deletions
diff --git a/libgo/go/strings/indexbyte.c b/libgo/go/strings/indexbyte.c
new file mode 100644
index 00000000000..27f4240b44c
--- /dev/null
+++ b/libgo/go/strings/indexbyte.c
@@ -0,0 +1,29 @@
+/* indexbyte.c -- implement strings.IndexByte for Go.
+
+   Copyright 2013 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include <stddef.h>
+
+#include "runtime.h"
+#include "go-string.h"
+
+/* This is in C so that the compiler can optimize it appropriately.
+   We deliberately don't split the stack in case it does call the
+   library function, which shouldn't need much stack space.  */
+
+intgo IndexByte (String, char)
+  __asm__ (GOSYM_PREFIX "strings.IndexByte")
+  __attribute__ ((no_split_stack));
+
+intgo
+IndexByte (String s, char b)
+{
+  const char *p;
+
+  p = __builtin_memchr ((const char *) s.str, b, s.len);
+  if (p == NULL)
+    return -1;
+  return p - (const char *) s.str;
+}