1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)FNIL.c 1.3 06/10/81"; 4 5 #include "h00vars.h" 6 7 char * 8 FNIL(curfile) 9 10 register struct iorec *curfile; 11 { 12 if (curfile->fblk >= MAXFILES || _actfile[curfile->fblk] != curfile) { 13 ERROR("Reference to an inactive file\n", 0); 14 return; 15 } 16 if (curfile->funit & FDEF) { 17 ERROR("%s: Reference to an inactive file\n", curfile->pfname); 18 return; 19 } 20 if (curfile->funit & FREAD) { 21 IOSYNC(curfile); 22 } 23 return curfile->fileptr; 24 } 25