Message-ID: <3587625A.81EBA2E8@post.comstar.ru>
Date: Wed, 17 Jun 1998 10:29:46 +0400
From: Dim Zegebart <zager AT post DOT comstar DOT ru>
Reply-To: zager AT post DOT comstar DOT ru
Organization: Comstar Ltd.
MIME-Version: 1.0
To: e96pd AT efd DOT lth DOT se
CC: djgpp AT delorie DOT com
Subject: Re: Help! Why is my program crashing?
References: <35867E83 DOT E01 AT efd DOT lth DOT se>
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Peter Danielsson wrote:

> Why does my program crash all the time. It's a simple program, only a
> few lines:
>
> int WIDTH=513;
> int *mapheight;
>
> void initmapheight(int *n)//allocateing memory
> {
>  n=(int*)calloc((long)513*513,sizeof(int));
>  if(n==NULL)
>          exit(-1);
> }
> void reset(int *m,int W2)//set to zero. Here it crashes
> {
>  for(int a5=0;a5<W2;a5++)
>          for(int q=0;q<W2;q++)
>                 m[(long)a5*W2+q]=0;
> }
> void main(int argc, char *argv[])
> {
> initmapheight(mapheight);
> reset(mapheight,100);
> }

To avoid problems with passing pointer to function just change your code
as folows :
int * initmapheight()
{ int *map;
  map=(int*)calloc((long)513*513,sizeof(int));
  return(map);
}

int main(int argc, char *argv[])
{ mapheight=inimapheight():
  if (!mapheight) exit(-1);

}
--
____ ____
|   \   /   Dim Zegebart
____/____

Moscow Russia
WWW - http://www.geocities.com/siliconvalley/pines/7817
DZcomm - comm library for Allegro
Palantir - multitasking kernel for Allegro (based on PDMLWP)