BSD 4_3 release

[unix-history] / usr / src / usr.lib / libpc / READ4.c

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

static char sccsid[] = "@(#)READ4.c 1.8 10/28/83";

#include "h00vars.h"
#include <errno.h>
extern int errno;

long
READ4(curfile)

       register struct iorec   *curfile;
{
       long                    data;
       int                     retval;

       if (curfile->funit & FWRITE) {
               ERROR("%s: Attempt to read, but open for writing\n",
                       curfile->pfname);
               return;
       }
       UNSYNC(curfile);
       errno = 0;
       retval = fscanf(curfile->fbuf, "%ld", &data);
       if (retval == EOF) {
               ERROR("%s: Tried to read past end of file\n", curfile->pfname);
               return;
       }
       if (retval == 0) {
               ERROR("%s: Bad data found on integer read\n", curfile->pfname);
               return;
       }
       if (errno == ERANGE) {
               ERROR("%s: Overflow on integer read\n", curfile->pfname);
               return;
       }
       if (errno != 0) {
               PERROR("Error encountered on integer read ", curfile->pfname);
               return;
       }
       return data;
}