lexdump.c

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/******************************************************************************
 *
 *  lexdump.c - This utility outputs a specified ordinal entry from a lex
 *
 * $Id: lexdump.c 2833 2013-06-29 06:40:28Z chrislit $
 *
 * Copyright 1999-2013 CrossWire Bible Society (http://www.crosswire.org)
 *  CrossWire Bible Society
 *  P. O. Box 2528
 *  Tempe, AZ  85280-2528
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation version 2.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 */

#ifdef _MSC_VER
    #pragma warning( disable: 4996 )
#endif

#include <ctype.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#ifndef __GNUC__
#include <io.h>
#else
#include <unistd.h>
#endif

#ifndef O_BINARY
#define O_BINARY 0
#endif

int main(int argc, char **argv) {
    char *tmpbuf;
    int idxfd, datfd;
    long offset;
    unsigned int size;
    char datbuf[255];

    if (argc != 3) {
        fprintf(stderr, "usage: %s <datapath/datafilebasename> <index>\n", argv[0]);
        exit(1);
    }

    tmpbuf = calloc(strlen(argv[1]) + 11,1);
    sprintf(tmpbuf, "%s.idx", argv[1]);
    idxfd = open(tmpbuf, O_RDONLY|O_BINARY);
    sprintf(tmpbuf, "%s.dat", argv[1]);
    datfd = open(tmpbuf, O_RDONLY|O_BINARY);
    free(tmpbuf);

    offset = atoi(argv[2]) * 6;
    lseek(idxfd, offset, SEEK_SET);
    read(idxfd, &offset, 4);
    read(idxfd, &size, 2);
    printf("offset: %ld; size: %d\n", offset, size);
    lseek(datfd, offset, SEEK_SET);
    read(datfd, datbuf, 40);
    datbuf[40] = 0;
    printf("%s\n", datbuf);
    close(datfd);
    close(idxfd);
    return 0;

}