Message-Id: <1.5.4.32.19960609091738.0066e974@mail.telepac.pt>
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Date: Sun, 09 Jun 1996 10:17:38 +0100
To: owner-djgpp-list AT delorie DOT com, djgpp AT delorie DOT com
From: Goncalo Farias <mad AT grupo DOT bfe DOT pt>
Subject: I'm unable do understand...

        
I've been trying to learn djgpp version2 and i copied the example provided
with the explanation for the movedata() and all i get is:

Exiting due to signal SIGSEGV
General Protection Fault at eip=00002eb1, error=1624
eax=00000117 ebx=0000004f ecx=00000780 edx=00000f00 esi=00000500 edi=000000a0
ebp=00398f00 esp=00398ef4 cs=00ff ds=0107 es=0107 fs=00d7 gs=0117 ss=0107
Call frame traceback EIPs:
  0x00002eb1
  0x00001612
  0x00001b73

This is the "offending" code:

===============================================================
#include <stdio.h>
#include <sys/movedata.h>
#include <go32.h>
int main (void)
{
 short blank_row_buf[ScreenCols()];
 /* scroll screen */
 movedata(_dos_ds, 0xb8000 + ScreenCols()*2, _dos_ds, 0xb8000,
 ScreenCols() * (ScreenRows()-1) * 2);
 /* fill last row */
 movedata(_my_ds, (int)blank_row_buf, _dos_ds, 0xb8000 +
 ScreenCols()*(ScreenRows()-1)*2, ScreenCols() * 2);
 return (0);
}
===============================================================

It's weird. Shouldn't this example from the info files work? 

Ahh, btw, i don't usually use Email (especially to this kind of purpose) so
this message might get to the wrong places. I'm very sorry if that happens.



Goncalo Farias
Portugal