/*
 * fontload: load a font into a VGA or EGA monitor
 *
 * Written December 1991 by Orc (david parsons) for the public domain, except
 * as detailed below.
 *
 * Derived in part from Usefont, by Boon Song - copyright notice reproduced
 * below:
 * -----------------------------
 *      Copyright (C) 1991 Boon Song
 *      P.O. Box 2013, OIT
 *      Klamath Falls, OR 97601
 *
 *  TERMS & CONDITIONS:
 *
 *     May be used and/or distributed for non-profitable purposes only
 * -----------------------------
 *
 */
#define INCL_VIO
#include <os2.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>

#define VIO 0

#define EGA 2
#define VGA 3

VIOMODEINFO vmode;
VIOCONFIGINFO vcfg;
VIOFONTINFO vfont;

char bfr[4096];

getscreeninfo()
{
    vmode.cb = sizeof vmode;
    VioGetMode(&vmode, 0);
}

main(argc, argv)
char **argv;
{
    register long size;
    int pointsize;
    int ffd;
    int row;
    char fname[200];
    char *ext;

    vcfg.cb = sizeof vcfg;
    if (VioGetConfig(0, &vcfg, VIO)) {
	fprintf(stderr, "Hello?  I can't stat the display subsystem\n");
	exit(1);
    }

    if (vcfg.adapter != VGA && vcfg.adapter != EGA) {
	fprintf(stderr, "You're not a VGA or EGA monitor\n");
	exit(2);
    }

    getscreeninfo();

    if (argc != 2) {
	vfont.type = VGFI_GETCURFONT;
	vfont.cb = sizeof vfont;
	VioGetFont(&vfont, VIO);
	printf("current font: cxCell=%d,cyCell=%d\n",
		vfont.cxCell, vfont.cyCell);
	exit(0);
    }

    if ((ffd=open(argv[1], O_RDONLY|O_BINARY)) < 0) {
	sprintf(fname, "%s.f16", argv[1]);
	if ((ffd=open(fname, O_RDONLY|O_BINARY)) < 0) {
	    fprintf(stderr, "Can't read font %s\n", fname);
	    exit(4);
	}
    }

    size = read(ffd, bfr, 4096);

    pointsize = size/256;

    switch (pointsize) {
    case 14:if(vcfg.adapter!=EGA) {
		fprintf(stderr, "Can't load an 8x14 font onto a VGA monitor\n"); 
		exit(5);
	    }
	    vfont.cxCell = 8;
	    vfont.cyCell = 14;
	    row = 25;
	    break;

    case 8: if(vcfg.adapter==EGA) {
		vfont.cxCell = 8;
		vfont.cyCell = 8;
		row = 43;
	    }
	    else {
		vfont.cxCell = 9;
		vfont.cyCell = 8;
		row = 50;
	    }
	    break;

    case 16:if(vcfg.adapter!=VGA) {
		fprintf(stderr, "Can't load an 8x16 font onto an EGA monitor\n"); 
		exit(6);
	    }
	    else {
		vfont.cxCell = 9;
		vfont.cyCell = 16;
		row = 25;
	    }
	    break;
    default:fprintf(stderr, "Can't grok this font\n");
	    exit(7);
    }

    if (vmode.row != row) {
	/* need to change monitor resolution to fit the font.
	 */
	vmode.row = row;
	if (VioSetMode(&vmode, VIO) != 0) {
	    fprintf(stderr, "Can't reset monitor to fit font\n");
	    exit(8);
	}
    }
    vfont.cb = sizeof vfont;
    vfont.type = 0;
    vfont.cbData = size;
    vfont.pbData = bfr;

    VioSetFont(&vfont, VIO);
    exit(0);
} /* main */