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On machines with a 4 byte int, and a 8 byte pointer, the ESP could would fail. The problem is that 0 != NULL. 0 is an int (4 bytes) and NULL is a pointer (8), and this matters critically to varargs functions. If a 0 was passed as the 'terminating' argument, then only 4 bytes would be written to the stack, but va_arg(ap, char *) would try and pull 8, reading uninitalised memory. Andrew Bartlett (This used to be commit 72ca8e3b2a45179b731790e6329b978b22ac1ec0)