BSD 4 release

[unix-history] / usr / src / lib / libpc / FNIL.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)FNIL.c 1.1 10/29/80";

#include "h00vars.h"
#include "h01errs.h"

char *
FNIL(curfile)

       register struct iorec   *curfile;
{
       if (curfile->fblk >= MAXFILES || _actfile[curfile->fblk] != curfile) {
               ERROR(ENOFILE, 0);
               return;
       }
       if (curfile->funit & FDEF) {
               ERROR(EREFINAF, curfile->pfname);
               return;
       }
       if (curfile->funit & FREAD) {
               IOSYNC(curfile);
               if (curfile->funit & EOFF) {
                       ERROR(EPASTEOF, curfile->pfname);
                       return;
               }
       }
       return curfile->fileptr;
}