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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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v_03_01
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3n01054a
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1991-12-03
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98 lines
#include <stdio.h>
#include <string.h>
#include <dos.h>
struct video {
int segment;
int type;
int iscolor;
int mode;
int page;
int rows;
int cols;
};
void initvideo(void);
void getvconfig(struct video *);
/*
** descriptors for each display code starting with code 00
*/
char *types[] = {
"[00] No display",
"[01] Monochrome Display Adapter (MDA) w/mono display",
"[02] Color Graphics Adapter (CGA) w/color display",
"[03] <reserved>",
"[04] Enhanced Graphics Adapter (EGA) w/color display",
"[05] Enhanced Graphics Adapter (EGA) w/mono display",
"[06] Professional Graphics System (PGS) w/color display",
"[07] Video Graphics Array (VGA) w/analog mono display",
"[08] Video Graphics Array (VGA) w/analog color display",
"[09] <reserved>",
"[10] <reserved>",
"[11] Multi-Color Graphics Array (MCGA) w/analog mono display",
"[12] Multi-Color Graphics Array (MCGA) w/analog color display",
"Unknown display combination code",
};
struct video v;
int color = 0x07;
/*
** writes a string at the specified location
** by writing directly to video memory
*/
void vwrite(char *str,int row,int col,int color)
{
char far *screen;
FP_SEG(screen) = v.segment;
FP_OFF(screen) = (((row - 1) * v.cols) + (col - 1)) * 2;
while(*str) {
*screen++ = *str++;
*screen++ = (char)color;
}
} /* vwrite */
void main(int argc, char *argv[])
{
int blkwht = 0;
char buffer[81];
/* force black and white if /b option was given */
if(argc)
if(!stricmp(argv[1],"/B"))
blkwht = 1;
/* detect host display type */
initvideo();
/* fill our video data structure */
getvconfig(&v);
if(v.iscolor && !blkwht)
color = 0x1F;
/* print out values */
sprintf(buffer,"v.segment : %04X",v.segment);
vwrite(buffer,3,1,color);
sprintf(buffer,"v.type : %s",
(v.type >= 0 && v.type <= 13) ? types[v.type] : types[13]);
vwrite(buffer,4,1,color);
sprintf(buffer,"v.iscolor : %d",v.iscolor);
vwrite(buffer,5,1,color);
sprintf(buffer,"v.mode : %d",v.mode);
vwrite(buffer,6,1,color);
sprintf(buffer,"v.page : %d",v.page);
vwrite(buffer,7,1,color);
sprintf(buffer,"v.rows : %d",v.rows);
vwrite(buffer,8,1,color);
sprintf(buffer,"v.cols : %d",v.cols);
vwrite(buffer,9,1,color);
} /* main */