函数名: farcalloc 
 功  能: 从远堆栈中申请空间 
 用  法: #include <alloc.h> 
         void far *farcalloc(unsigned long units, unsigned ling unitsz); 
 程序例: 
 #include <stdio.h> 
 #include <alloc.h> 
 #include <string.h> 
 #include <dos.h> 
int main(void) 
 { 
    char far *fptr; 
    char *str = "Hello"; 
   /* allocate memory for the far pointer */ 
    fptr = farcalloc(10, sizeof(char)); 
   /* copy "Hello" into allocated memory */ 
    /* 
       Note: movedata is used because you 
       might be in a small data model, in 
       which case a normal string copy routine 
       can not be used since it assumes the 
       pointer size is near. 
    */ 
    movedata(FP_SEG(str), FP_OFF(str), 
      FP_SEG(fptr), FP_OFF(fptr), 
             strlen(str)); 
   /* display string (note the F modifier) */ 
    printf("Far string is: %Fs\n", fptr); 
   /* free the memory */ 
    farfree(fptr); 
   return 0; 
 }