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Path: utzoo!linus!philabs!cmcl2!harvard!talcott!wjh12!pixel!pixdoc!vsh
From: vsh@pixdoc.UUCP (Steve Harris)
Newsgroups: net.bugs
Subject: Bug in putc
Message-ID: <41@pixdoc.UUCP>
Date: Wed, 26-Mar-86 18:57:13 EST
Article-I.D.: pixdoc.41
Posted: Wed Mar 26 18:57:13 1986
Date-Received: Sun, 20-Apr-86 10:18:13 EST
Organization: Pixel Systems, Woburn, MA
Lines: 13

There is a bug in the putc macro, in stdio.h.
Putc returns an int which contains the char you have just "put".
However, (at least on both a Pixel and a Sun), the result is sign extended;
if the 8th bit of the char is set, the return value from putc does not equal
the character you put!  To fix, replace the putc macro with the following:

#define putc(x,p) ((int) ((--(p)->_cnt>=0? ((unsigned char)(*(p)->_ptr++=(x))):(unsigned char)_flsbuf((x),p))))
-- 

Steve Harris            |  {allegra|ihnp4|cbosgd|ima|genrad|amd|harvard}\
xePIX, Inc.             |               !wjh12!pixel!pixdoc!vsh
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