Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
From: David Warren <warren AT cs DOT sunysb DOT edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <16397.44803.957497.819723@gargle.gargle.HOWL>
Date: Tue, 20 Jan 2004 17:43:15 -0500 (EST)
To: cygwin AT cygwin DOT com
Subject: unsigned char in getc()?


I'm getting an int value of -80 returned by getc(), whereas fgetc()
returns 176 for the same input character.  This seems to be caused by
the definition of getc() in cygwin/usr/include/mingw/stdio.h, which
is:

__CRT_INLINE int __cdecl getc (FILE* __F)
{
  return (--__F->_cnt >= 0)
    ?  (int) *__F->_ptr++
    : _filbuf (__F);
}

The _ptr field is of type char* (not unsigned char*).

A definition of getc() I found elsewhere is:

#define getc(_stream)     (--(_stream)->_cnt >= 0 \
                ? 0xff & *(_stream)->_ptr++ : _filbuf(_stream))

which and's in the 0xff to get the unsigned value.

This seems to have become broken in a recent gcc.  Shouldn't this be
fixed, or am I misunderstanding something?

-David S. Warren
XSB, Inc.

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/