memcpy in string.h

$ man memcpy
MEMCPY(3)                          Linux Programmer's Manual                         MEMCPY(3)



NAME
       memcpy - copy memory area

SYNOPSIS
       #include <string.h>

Why the fuck is memcpy in string.h? It is not exclusively for dealing with strings, shouldn't it be with malloc, exit & co. in stdlib.h?

I'm aware that this is because of the ISO specification, and that it is probably like this for historical reasons, but what are those historical reasons?

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