usr/src/usr.bin/pascal/libpc/READ4.c

/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#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;
}