[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/string/arm/strlen.c

@@ -0,0 +1,42 @@
+/***
+*strlen.c - contains strlen() routine
+*
+*       Copyright (c) Microsoft Corporation. All rights reserved.
+*
+*Purpose:
+*       strlen returns the length of a null-terminated string,
+*       not including the null byte itself.
+*
+*******************************************************************************/
+
+#include <string.h>
+
+#pragma function(strlen)
+
+/***
+*strlen - return the length of a null-terminated string
+*
+*Purpose:
+*       Finds the length in bytes of the given string, not including
+*       the final null character.
+*
+*Entry:
+*       const char * str - string whose length is to be computed
+*
+*Exit:
+*       length of the string "str", exclusive of the final null byte
+*
+*Exceptions:
+*
+*******************************************************************************/
+
+size_t __cdecl strlen (
+        const char * str
+        )
+{
+        const char *eos = str;
+
+        while( *eos++ ) ;
+
+        return( eos - str - 1 );
+}