Category : Files from Magazines
Archive : WDAUG92.ZIP
Filename : 3N08049A
Output of file : 3N08049A contained in archive : WDAUG92.ZIP
/* texttsr.c */
/* -- This TSR is used to enter and leave 80x25 text */
/* mode. */
/* -- Windows video state is saved on entry to text */
/* mode and restored on exit. */
/*****************************************************/
/*****************************************************/
/* Header files. */
/*****************************************************/
#include
#include
#include
#include "texttsr.h"
/*****************************************************/
/* Constants. */
/*****************************************************/
#define cbBlock 0x0040
#define cblkMax 0x0010
#define cbState (cbBlock * cblkMax)
#define pbNull ((unsigned char *)0)
/*****************************************************/
/* Globals. */
/*****************************************************/
/* Imports. */
extern unsigned end;
/* Internal. */
void (interrupt far * pfnOld)(); /* Next in chain. */
/* Video state buffer. */
unsigned char rgbState[cbState];
/* Previous video mode. */
unsigned char bModeSav;
/* Number of 64 byte blocks required to save state. */
unsigned int cblk;
/*****************************************************/
/* Routines. */
/*****************************************************/
void interrupt far
IntHandler(int es, int ds, int di, int si, int bp,
int sp, int bx, int dx, int cx, int ax, int ip,
int cs, int flags)
/*****************************************************/
/* -- Multiplex interrupt handler. */
/*****************************************************/
{
switch (ax)
{
default:
_chain_intr(pfnOld);
break;
case cmdIsLoaded:
ax = 0x00ff;
break;
case cmdEnterText:
{
unsigned char * pb;
pb = rgbState;
_asm
{
/* Fill hardware state buffer. */
push ds
pop es
mov bx, pb
mov cx, 0x0007
mov ax, 0x1c01
int 0x10
/* Remember current video mode. */
mov ah, 0x0f
int 0x10
mov bModeSav, al
/* Set 80x25 text mode. */
mov ax, 0x0007
int 0x10
}
}
break;
case cmdExitText:
{
unsigned char * pb = rgbState;
_asm
{
/* Restore previous video mode. */
mov ah, 0x00
mov al, bModeSav
int 0x10
/* Restore previous VGA state. */
mov cx, 0x0007
push ds
pop es
mov bx, pb
mov ax, 0x1c02
int 0x10
}
}
break;
}
}
int
main(void)
/*****************************************************/
/* -- Entry point. */
/*****************************************************/
{
unsigned far * lpuwUpper;
unsigned int cpgf, cpgfMax, cbStack;
unsigned char bVal;
/* Check to see if we have been loaded already. */
_asm
{
mov ax, cmdIsLoaded;
int 0x2f
mov bVal, al
}
if (bVal == 0xff)
return 0;
/* Make sure adaptor supports save/restore */
/* state. Use the get buffer size, returns 0x1c */
/* in AL for success. */
_asm
{
mov ax, 0x1c00
mov cx, 0x0007
int 0x10
mov cblk, bx
mov bVal, al
}
if (bVal != 0x1c || cblk > cblkMax)
return -1;
/* Install TSR. */
lpuwUpper = &end;
cbStack = ((stackavail() + 2048) / 2048) * 2048;
cpgf = (FP_SEG(lpuwUpper) - _psp) +
(FP_OFF(lpuwUpper) + cbStack) / 16 + 1;
pfnOld = _dos_getvect(0x2f);
_dos_setvect(0x2f, IntHandler);
_dos_setblock(cpgf, _psp, &cpgfMax);
_dos_keep(0, cpgf);
return -1;
}
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