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28 mv_fox 1 
/*
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 * Video routines used by the Svarog386 installer
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 * Copyright (C) 2016 Mateusz Viste
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 *
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 * All video routines output data directly to VRAM, and they all do that
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 * to both B8000:0000 and B0000:0000 areas simulteanously, for compatibility
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 * with all possible video adapters in all possible modes.
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 */
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#include <dos.h>
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#include "video.h" /* include self for control */
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/* pointers to VGA/MDA screens */
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static unsigned short far *vga = (unsigned short far *)0xB8000000L;
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static unsigned short far *mda = (unsigned short far *)0xB0000000L;
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void video_clear(unsigned short attr, int offset) {
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  int x;
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  for (x = offset; x < 2000; x++) {
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    vga[x] = attr;
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    mda[x] = attr;
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  }
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}
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void video_putchar(int y, int x, unsigned short attr, int c) {
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  int offset = (y << 6) + (y << 4) + x;
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  vga[offset] = attr | c;
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  mda[offset] = attr | c;
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}
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void video_putcharmulti(int y, int x, unsigned short attr, int c, int repeat, int step) {
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  int offset = (y << 6) + (y << 4) + x;
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  while (repeat-- > 0) {
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    vga[offset] = attr | c;
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    mda[offset] = attr | c;
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    offset += step;
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  }
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}
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void video_putstring(int y, int x, unsigned short attr, char *s) {
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  x += (y << 6) + (y << 4); /* I use x as an offset now */
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  while (*s != 0) {
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    unsigned short b = attr | *s;
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    vga[x] = b;
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    mda[x] = b;
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    x++;
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    s++;
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  }
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}
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void video_putstringfix(int y, int x, unsigned short attr, char *s, int w) {
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  x += (y << 6) + (y << 4); /* I use x as an offset now */
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  while (w-- > 0) {
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    unsigned short b;
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    b = attr | *s;
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    if (*s != 0) s++;
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    vga[x] = b;
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    mda[x] = b;
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    x++;
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  }
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}
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void video_movecursor(int y, int x) {
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  union REGS r;
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  r.h.ah = 2;
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  r.h.bh = 0;
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  r.h.dh = y;
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  r.h.dl = x;
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  int86(0x10, &r, &r);
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}