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FreeWare Collection 2
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FreeSoftwareCollection2pd199x-jp.img
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ms_dos
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g_viwprt.c
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1990-06-14
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727b
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39 lines
#include <stdio.h>
#include <dos.h>
struct VIEWPORT {
unsigned type,escno,escln;
int startx,starty,endx,endy;
};
extern unsigned char gds_fshift;
extern unsigned gds_wrkoff;
extern unsigned gds_wrkseg;
int g_viewport(int x1,int y1,int x2,int y2)
{
union REGS reg;
struct SREGS seg;
struct {
unsigned len;
struct VIEWPORT vw;
} gdata;
segread(&seg);
reg.h.ah=gds_fshift+0x0f;
reg.x.di=(unsigned)&gdata;
seg.ds=seg.ss;
gdata.len=14;
gdata.vw.type=0x602c;
gdata.vw.escno=1;
gdata.vw.escln=8;
gdata.vw.startx=x1;
gdata.vw.starty=y1;
gdata.vw.endx=x2;
gdata.vw.endy=y2;
reg.x.bx=gds_wrkoff;
seg.es=gds_wrkseg;
int86x(0x92,®,®,&seg);
return (int)reg.h.ah;
}