1 files changed, 49 insertions, 0 deletions
diff --git a/newlib/libc/string/strnlen.c b/newlib/libc/string/strnlen.c
new file mode 100644
index 000000000..b9a3b5e77
--- /dev/null
+++ b/newlib/libc/string/strnlen.c
@@ -0,0 +1,49 @@
+/* 
+FUNCTION
+	<<strnlen>>---character string length
+	
+INDEX
+	strnlen
+
+ANSI_SYNOPSIS
+	#include <string.h>
+	size_t strnlen(const char *<[str]>, size_t <[n]>);
+
+TRAD_SYNOPSIS
+	#include <string.h>
+	size_t strnlen(<[str]>, <[n]>)
+	char *<[src]>;
+	size_t <[n]>;
+
+DESCRIPTION
+	The <<strnlen>> function works out the length of the string
+	starting at <<*<[str]>>> by counting chararacters until it
+	reaches a NUL character or the maximum: <[n]> number of
+        characters have been inspected.
+
+RETURNS
+	<<strnlen>> returns the character count or <[n]>.
+
+PORTABILITY
+<<strnlen>> is a Gnu extension.
+
+<<strnlen>> requires no supporting OS subroutines.
+
+*/
+
+#undef __STRICT_ANSI__
+#include <_ansi.h>
+#include <string.h>
+
+size_t
+_DEFUN (strnlen, (str, n),
+	_CONST char *str _AND
+	size_t n)
+{
+  _CONST char *start = str;
+
+  while (*str && n-- > 0)
+    str++;
+
+  return str - start;
+}