1 files changed, 58 insertions, 0 deletions
diff --git a/src/pal/src/safecrt/strlen_s.cpp b/src/pal/src/safecrt/strlen_s.cpp
new file mode 100644
index 0000000000..3f1e1cf1ae
--- /dev/null
+++ b/src/pal/src/safecrt/strlen_s.cpp
@@ -0,0 +1,58 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/***
+*strlen_s.c - contains strnlen() routine
+*
+
+*
+*Purpose:
+*   strnlen returns the length of a null-terminated string,
+*   not including the null byte itself, up to the specified max size
+*
+*******************************************************************************/
+
+
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include "internal_securecrt.h"
+
+#include "mbusafecrt_internal.h"
+
+/***
+*strnlen - return the length of a null-terminated string
+*
+*Purpose:
+*   Finds the length in bytes of the given string, not including
+*   the final null character. Only the first maxsize characters
+*   are inspected: if the null character is not found, maxsize is
+*   returned.
+*
+*Entry:
+*   const char * str - string whose length is to be computed
+*   size_t maxsize
+*
+*Exit:
+*   Length of the string "str", exclusive of the final null byte, or
+*   maxsize if the null character is not found.
+*
+*Exceptions:
+*
+*******************************************************************************/
+
+size_t __cdecl PAL_strnlen(const char *str, size_t maxsize)
+{
+    size_t n;
+
+    /* Note that we do not check if str == NULL, because we do not
+     * return errno_t...
+     */
+
+    for (n = 0; n < maxsize && *str; n++, str++)
+        ;
+
+    return n;
+}
+