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From: chem194@csc.canterbury.ac.nz (John Davis)
Newsgroups: comp.unix.aix
Subject: Re: Why does this fail? [repost]
Message-ID: <1991Jun24.104705.1172@csc.canterbury.ac.nz>
Date: 23 Jun 91 22:47:05 GMT
References: <1991Jun21.143411.21416@siia.mv.com>
Organization: Chem Dept, U of Cant, ChCh NZ
Lines: 43

In article <1991Jun21.143411.21416@siia.mv.com>, drd@siia.mv.com (David Dick) writes:
> The program at the end of this posting produces the following
> output when run on the three machines given:
> 
> RESULTS--
> 
> 	ARIX (Motorola 68020):
> 
> 	inch returned 'X' (0x58)
> 
> 	IBM RS/6000:
> 
> 	inch returned '' (0x0)
>
> PROGRAM--
> 
>     /* intst -- simple inch() test */
> 
>     #include <curses.h>
>     #include <stdio.h>
> 
>     main()
>     {
> 	int ch;
> 
> 	initscr();
> 	move(10,10);
> 	addch('X');
> 	move(10,10);
> 	ch = inch();
> 	endwin();
> 	printf("inch returned '%c' (0x%0x)\n",ch,ch);
>     }

Welcome to the club - I just found that one too. As far as I 
can see, stdscr->_y is not being initialised properly (in fact
it's nil), resulting in inch() (which derefs _y) grabbing
random chars. If you're real lucky you'll segmentation violation!!!

-----------------------------------------------------------
| o      John Davis - CHEM194@csc.canterbury.ac.nz       o |
| o    (Depart)mental Programmer,Chemistry Department    o |
| o  University of Canterbury, Christchurch, New Zealand o |