Pointer arithmetic

[Chip Salzenberg]

According to kdq at demott.COM (Kevin D. Quitt):
>    The actual code is:
>
>
>const unsigned char *chars   = "some string"
>unsigned char pass[];
>
>    c   = strchr( chars, toupper( pass[ i ]) ) - chars + 1;
>
>
>    gcc would not accept this no matter what I did.


If strchr() wasn't declared properly, gcc would complain.

But a more serious complaint is the lack of a check on the return
value of strchr().  It might be NULL, after all, in which case the
subtraction will send the resulting value into deep space.
-- 
Chip Salzenberg at Teltronics/TCT     <chip at tct.uucp>, <uunet!pdn!tct!chip>
       "If Usenet exists, then what is its mailing address?"  -- me
             "c/o The Daily Planet, Metropolis."  -- Jeff Daiell