DOS 下多任务系统的设计与实现 -- 源码 -- 屏幕装入保存

1、LOADDISP.C

#include <fcntl.h>

#include <io.h>

#include <dos.h>

#define DISPMAP "disp.map"

#define GRAPHSIZE 65534

char far *dispbuf=MK_FP(0xb800,0);

char buf[20][256];

int handle;

char cur[2];

loadega(char *sfile) {

unsigned char i,j;

handle=_open(sfile,O_RDWR);

if(handle==-1)

return 1;

_read(handle,&i,1);

_read(handle,cur,2);

_AH=0;

_AL=i;

geninterrupt(0x10);

_read(handle,buf[0],5117);

if(i>8)

{

for(j=1;j<8;j*=2) {

_ES=FP_SEG(buf[j]);

_BX=FP_OFF(buf[j]);

_CX=j;

_AX=0x1c02;

geninterrupt(0x10);

}

}

_DL=cur[0];

_DH=cur[1];

_BH=0;

_AH=2;

geninterrupt(0x10);

if(i<8)

readtext();

else

readgraph();

_close(handle);

}

char path[64];

char name[64];

main(int argc,char *argv[]) {

char *s,*t;

s=argv[0];

t=0;

for(;*s;s++) {

if(*s=='\\')

t=s;

}

*(t+1)=0;

sprintf(path,"%s",argv[0]);

if(argc>1)

sprintf(name,"%s",argv[1]);

else

sprintf(name,"%s%s",path,DISPMAP);

loadega(name);

}

readgraph() {

unsigned char far *buffer;

char tmp[2];

buffer=MK_FP(0xa000,0);

tmp[0]=inportb(0x3c4);

outportb(0x3c4,2);

tmp[1]=inportb(0x3c5);

outportb(0x3c5,8);

_read(handle,(char *far)buffer,GRAPHSIZE);

outportb(0x3c5,4);

_read(handle,(char *far)buffer,GRAPHSIZE);

outportb(0x3c5,2);

_read(handle,(char *far)buffer,GRAPHSIZE);

outportb(0x3c5,1);

_read(handle,(char *far)buffer,GRAPHSIZE);

outportb(0x3c5,tmp[1]);

outportb(0x3c4,tmp[0]);

}

readtext() {

int i,a,b;

int c,r;

int x,y;

_read(handle,(char far *)dispbuf,4000);

}

2、SAVEDISP.C

#include <fcntl.h>

#include <io.h>

#include <dos.h>

#define DISPMAP "disp.map"

#define GRAPHSIZE 65534

char far *dispbuf=MK_FP(0xb800,0);

char buf[20][256];

int handle;

char cur[2];

saveega(char *sfile) {

unsigned char i;

for(i=1;i<8;i*=2) {

_ES=FP_SEG(buf[i]);

_BX=FP_OFF(buf[i]);

_CX=i;

_AX=0x1c01;

geninterrupt(0x10);

}

_AH=0xf;

geninterrupt(0x10);

i=_AL;

_BH=0;

_AH=3;

geninterrupt(0x10);

cur[0]=_DL;

cur[1]=_DH;

handle=_creat(sfile,FA_ARCH);

if(handle==-1)

return 1;

_write(handle,&i,1);

_write(handle,cur,2);

_write(handle,buf[0],5117);

if(i<8)

_write(handle,dispbuf,4000);

else

writegraph();

_close(handle);

}

char path[64];

char name[64];

main(int argc,char *argv[]) {

char *s,*t;

s=argv[0];

t=0;

for(;*s;s++) {

if(*s=='\\')

t=s;

}

*(t+1)=0;

sprintf(path,"%s",argv[0]);

if(argc>1)

sprintf(name,"%s",argv[1]);

else

sprintf(name,"%s%s",path,DISPMAP);

saveega(name);

}

writegraph() {

unsigned char far *buffer;

buffer=MK_FP(0xa000,0);

outportb(0x3ce,5);

outportb(0x3cf,0);

outportb(0x3ce,4);

outportb(0x3cf,3);

_write(handle,(void *far)buffer,GRAPHSIZE);

outportb(0x3cf,2);

_write(handle,(void *far)buffer,GRAPHSIZE);

outportb(0x3cf,1);

_write(handle,(void *far)buffer,GRAPHSIZE);

outportb(0x3cf,0);

_write(handle,(void *far)buffer,GRAPHSIZE);

}