1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)FNIL.c 1.2 01/24/81"; 4 5 #include "h00vars.h" 6 #include "h01errs.h" 7 8 char * 9 FNIL(curfile) 10 11 register struct iorec *curfile; 12 { 13 if (curfile->fblk >= MAXFILES || _actfile[curfile->fblk] != curfile) { 14 ERROR(ENOFILE, 0); 15 return; 16 } 17 if (curfile->funit & FDEF) { 18 ERROR(EREFINAF, curfile->pfname); 19 return; 20 } 21 if (curfile->funit & FREAD) { 22 IOSYNC(curfile); 23 } 24 return curfile->fileptr; 25 } 26