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From: shearer@cis.udel.edu (Rob Shearer)
Newsgroups: comp.os.msdos.programmer,alt.msdos.programmer
Subject: ReDirecting printf to memory????
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Date: 30 Sep 90 02:50:15 GMT
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Hello!   Yet another cryptic question that may sound very weird!

I am interested in making printf (and anything else that would print to
the screen) print to a memory location instead.

I know how to create a variable (I am using TC++ by the way) that 
will let me store data straight into the screen, but right now I would
rather redirect all output to a memory location, then when I want the
data on my screen, to give a command that will swap it in..

For example (Semi-Psuedo Code):

main () {
  unsigned int * scrn;

  scrn = MK_FP(0xb800);         /* Assuming Color Monitor of course */
  scrn[0] = 0x0900+'A';

  printf("Hello, World\n");

}

the scrn[0] will put a white (grey?) A on the screen in the upper left corner.
But I would like to do some remapping so that printf will put 
Hello, World into a variable like scrn so I can copy scrn to the actual
screen memory area at a later time.  The catch is, I am trying to do this
with out changing all my printfs that I have (or any console output be it
printf, putch, putchar etc...)

Any help would be GREATLY appreciated!

-Robb Shearer
shearer@sol.cis.udel.edu