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From: | "A. Sinan Unur" <asu1 AT cornell DOT edu> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: fread/fwite return value |
Date: | Wed, 16 Jul 1997 14:59:05 -0400 |
Organization: | Cornell University |
Lines: | 26 |
Sender: | asu1 AT cornell DOT edu (Verified) |
Message-ID: | <33CD19F9.4FF2@cornell.edu> |
References: | <422564D6 DOT 005C61DE DOT 00 AT aks DOT com> |
NNTP-Posting-Host: | 128 |
Mime-Version: | 1.0 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
eyal DOT ben-david AT aks DOT com wrote: > > On 7/16/97 6:05:33 PM heretic wrote: > > >So, I wanted to have error checking and I wrote something like > > > > if ( fread(blah,blah,blah) == -1 ) > > { > > oh_no_error (); > > } > > > >But compiler warned that I am comparing unsigned and signed. And it > >was right: size_t is unsigned long! Anyone knows how fread or fwrite > >can return -1 on error while its return value is unsigned? > > > cast . now it is 0xFFFFFFFF. > > if (fread (...) == (size_t) -1) > { > ..... > } and could you tell me how on earth you would distinguish that from a valid number of bytes read by fread??? -- Sinan
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