BSD 4_3_Reno release

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

/*-
* Copyright (c) 1979 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement:  ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
static char sccsid[] = "@(#)READ4.c     1.10 (Berkeley) 4/9/90";
#endif /* not lint */

#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);
       }
       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);
       }
       if (retval == 0) {
               ERROR("%s: Bad data found on integer read\n", curfile->pfname);
       }
       if (errno == ERANGE) {
               ERROR("%s: Overflow on integer read\n", curfile->pfname);
       }
       if (errno != 0) {
               PERROR("Error encountered on integer read ", curfile->pfname);
       }
       return data;
}