FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/file/file_check.c

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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;
            unsigned char   fillchar = DATA;
            int             bigbuffersize = BIGBUFFERSIZE;
    
            /*
             * 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);
                            }
                    }
            } while (n == bigbuffersize);
    
            return (0);
    }

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