cmd/file_check/file_check.c

	file_check.c revision d583b39bfb4e2571d3e41097c5c357ffe353ad45
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "../file_common.h"

static unsigned char bigbuffer[BIGBUFFERSIZE];

/*
 * Given a filename, check that the file consists entirely
 * of a particular pattern. If the pattern is not specified a
 * default will be used. For default values see file_common.h
 */
int
main(int argc, char **argv)
{
    int     bigfd;
    long        i, n;
    uchar_t     fillchar = DATA;
    int     bigbuffersize = BIGBUFFERSIZE;
    int64_t     read_count = 0;

    /*
     * Validate arguments
     */
    if (argc < 2) {
        (void) printf("Usage: %s filename [pattern]\n",
            argv[0]);
        exit(1);
    }

    if (argv[2]) {
        fillchar = atoi(argv[2]);
    }

    /*
     * Read the file contents and check every character
     * against the supplied pattern. Abort if the
     * pattern check fails.
     */
    if ((bigfd = open(argv[1], O_RDONLY)) == -1) {
        (void) printf("open %s failed %d\n", argv[1], errno);
        exit(1);
    }

    do {
        if ((n = read(bigfd, &bigbuffer, bigbuffersize)) == -1) {
            (void) printf("read failed (%ld), %d\n", n, errno);
            exit(errno);
        }

        for (i = 0; i < n; i++) {
            if (bigbuffer[i] != fillchar) {
                (void) printf("error %s: 0x%x != 0x%x)\n",
                    argv[1], bigbuffer[i], fillchar);
                exit(1);
            }
        }

        read_count += n;
    } while (n == bigbuffersize);

    return (0);
}