dos/conio.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * conio.c
  15  *
  16  * Output to the screen
  17  */
  18
  19 #include <stdarg.h>
  20 #include "mystuff.h"
  21
  22 int putchar(int ch)
  23 {
  24   if ( ch == '\n' )
  25     putchar('\r');
  26   asm("movb $0x02,%%ah ; int $0x21" : : "d" (ch));
  27   return ch;
  28 }
  29
  30 /* Note: doesn't put '\n' like the stdc version does */
  31 int puts(const char *s)
  32 {
  33   int count = 0;
  34
  35   while ( *s ) {
  36     putchar(*s);
  37     count++;
  38     s++;
  39   }
  40
  41   return count;
  42 }