Date: Thu, 4 May 1995 08:39:42 +0100 (CET)
From: Roland Exler <R DOT Exler AT jk DOT uni-linz DOT ac DOT at>
Sender: k3a0270 AT pop DOT uni-linz DOT ac DOT at
Reply-To: R DOT Exler AT jk DOT uni-linz DOT ac DOT at
To: djgpp <djgpp AT sun DOT soe DOT clarkson DOT edu>
Subject: RE: messages scroll off screen

As other mentioned, putting 2r1 into the environment of GO32= redirects
stderr to stdout, so you can redirect your errors to a file or use |more,
but more has no possibility to get back.

I wrote a simple program called PG similar to PG on UNIX-systems which could
be used instead of more. For example my environment is more than one screen,
so if I've to look at the environment I use SET|PG

As I think this is useful for many of you, I enclose it with this mail

Roland
+---------------------------------------+---------------------------+
I Roland Exler                          I EMAIL:                    I
I Universitaet Linz                     I R DOT Exler AT jk DOT uni-linz DOT ac DOT at I
I Institut fuer Elektrische Messtechnik I                           I
I Altenbergerstr. 69                    I Phone:                    I
I A-4040 Linz, AUSTRIA                  I + 43 732 2468 9205        I
+---------------------------------------+---------------------------+
#include<stdio.h>
#include<stdlib.h>

#define LINELEN 100
#define PAGELEN 24
#define MAXLINES 10000

char* (zp[MAXLINES+2]);
int znum;
int topline;

void allout()
{ for (int i=0; i<znum; i++)
  {
    fprintf(stdout,"%s",zp[i]);
    fflush(stdout);
  };
};

void outline(int i)
{
  if (i<znum)
    printf ("%s",zp[i]);
};

void outpage()
{
  for (int i=topline; i<topline+PAGELEN; i++)
    outline(i);
}

int main()
{
  char input[LINELEN+1];
  zp[0]="===================== TOP OF FILE =======================\n";
  znum=1;
  while (fgets(input,LINELEN,stdin) && (znum<MAXLINES))
  {
    zp[znum]=new char[strlen(input)+1];
    if (!zp[znum])
      { fprintf(stderr,"Not enough Memory!\n"); abort(); };
    strcpy(zp[znum],input);
//    fprintf(stdout,"%li %s",strlen(input),zp[znum]);
    znum++;
  };
  if (znum>=MAXLINES+1)
  { fprintf (stderr,"Too much Lines, first %i Lines shown!\n",MAXLINES);
    zp[znum++]="============== CAN'T PROCESS MORE LINES! ================\n";
  }
  else
    zp[znum++]="===================== END OF FILE =======================\n";

  topline=0;
  outpage();

  while (1)
  { printf ("PG: quit Up Dn PgUp PgDn Home End\x0d"); fflush(stdout);
    char c=getch();
    printf ("                                 \x0d");
    switch (c)
    {
    case 'q':  // quit
    case 'x':  // exit
      return 0;
      break;
    case 71:  // home
      topline=0;
      outpage();
      break;
    case 79:  // end
      if ((topline=znum-PAGELEN)<0) topline=0;
      outpage();
      break;
    case 73:  // page up
      if ((topline-=PAGELEN)<0) topline=0;
      outpage();
      break;
    case 81:  // page down
    case 32:  // space
      for (int i=0; (i<PAGELEN) && (topline+PAGELEN)<znum; i++)
        { outline(topline+PAGELEN); topline++; };
      break;
    case 72:  // cursor up
      if (topline)
        { topline--; outpage(); };
      break;
    case 80:  // cursor down
    case 13:  // return
      if ((topline+PAGELEN)<znum)
      { outline(topline+PAGELEN);
        topline++;
      };
      break;
/*
    case 'g':  // go
      printf("Enter Line number (TOP is %i of %i): ",topline,znum-2);
      scanf("%i\n",&topline);
        { outpage(); };
      break;
*/
    default:
      printf("%i ",c);
    };
  };
};