This function assumes that the string being passed in is terminated by {{code|NULL}} (<code>'\0'</code>). However, what would happen if <{{code>|style=white-space:nowrap|2=c|1=char buf[6] = {'h','e','l','l','o','!'};</code>}} were passed to this string? This is perfectly legal in C, yet would cause <code>strlen</code> to iterate through memory not necessarily associated with the string <code>s</code>. There are functions, such as <code>strnlen</code> which can be used to avoid such problems, but these functions are not standard with every implementation of [[ANSI C]]. The Cyclone version of <code>strlen</code> is not so different from the C version:
