--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libiberty/strncmp.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,33 @@
+/* strncmp -- compare two strings, stop after n bytes.
+   This function is in the public domain.  */
+
+/*
+
+@deftypefn Supplemental int strncmp (const char *@var{s1}, const char *@var{s2}, size_t @var{n})
+
+Compares the first @var{n} bytes of two strings, returning a value as
+@code{strcmp}.
+
+@end deftypefn
+
+*/
+
+#include <ansidecl.h>
+#include <stddef.h>
+
+int
+strncmp(const char *s1, const char *s2, register size_t n)
+{
+  register unsigned char u1, u2;
+
+  while (n-- > 0)
+    {
+      u1 = (unsigned char) *s1++;
+      u2 = (unsigned char) *s2++;
+      if (u1 != u2)
+	return u1 - u2;
+      if (u1 == '\0')
+	return 0;
+    }
+  return 0;
+}