Out-of-bounds pointers

[Doug Davis]

In article <1009 at mtxinu.UUCP> ed at mtxinu.COM (Ed Gould) writes:
>	void
>	f() {
>		char bug[100];
             ^^^^^^^^^^  I assume you mean buf here, right?
>		char *p;
>
>		p = buf;
>
>		p--;	/* p contains an illegal value: &buf[-1] */
        ^^^ Opps,  You have now entered the land of illegal addresses,
                   normally called the twilight zone, incrementing the
                   pointer is no longer guarenteed to be == &buf[0], that
                   is installation dependent.  Most likely it will == something
                   really weird and you get a core dump.  Which one you get
                   is left as an exercise to the reader.
    
                 
doug
__
Doug Davis/1030 Pleasant Valley Lane/Arlington/Texas/76015/817-467-3740
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