?? read.c
字號(hào):
/* A module of ASYNCx.LIB version 1.20 */
#include <dos.h>
#include "asyncdef.h"
/************************************************************
Receive n objects of size s from the port associated with p
within t eighteenths of a second. Start puting them into
memory starting at where buf points. Return the number of
whole objects received.
************************************************************/
int a_read(void *buf,int s,int n,ASYNC *p,int t)
{unsigned i;
byte *bp;
unsigned long t0,far *t1;
if (p)
{t1=(unsigned long far *)MK_FP(0x40,0x6c);
t0=*t1;
bp=(byte *)buf;
n*=s;
for(i=0;i<n && (*t1)-t0<=(unsigned long)t;i++)
if (a_icount(p))
*bp++=a_getc(p);
else
i--;
return(i/s);
}
return 0;
} /* end of a_read(buf,s,n,p,t) */
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