Xref: utzoo comp.lang.c:35090 comp.lang.c++:11030
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!pdn!tscs!tct!chip
From: chip@tct.uucp (Chip Salzenberg)
Newsgroups: comp.lang.c,comp.lang.c++
Subject: Re: Pointer arithmetic
Message-ID: <2788A63D.A86@tct.uucp>
Date: 7 Jan 91 16:47:57 GMT
References: <1991Jan5.001607.5915@demott.com>
Organization: Teltronics/TCT, Sarasota, FL
Lines: 22

According to kdq@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@tct.uucp>, <uunet!pdn!tct!chip>
       "If Usenet exists, then what is its mailing address?"  -- me
             "c/o The Daily Planet, Metropolis."  -- Jeff Daiell