/* 
 * password generator
 *
 * Copyright (c) 1999 Yoshihiko SARUMARU <mistral@imasy.org>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 * $Id: passwd_generater.c,v 1.3 2000-12-06 11:36:54+09 yohta Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

/* 
 *  symbols which placed in the same position between US and Japanese are
 *  selected, and we don't use missreadable characters 
 *  (such as 'I', "1", "l" ...) 
 */
char symbol[] = "234567890!#$%-|<>/?";
char alphabet[] = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ";

usage (char *prog) {
    fprintf(stderr, "usage: %s number_to_create\n", prog);
    exit(1);
}

main(int argc, char **argv) {
    char password[9] = "12345678"; /* password[8] = NULL */
    int count;
    int pos, i;
    int symbol_pos1, symbol_pos2;

    if (argc != 2) usage(argv[0]);

    count = atoi(argv[1]);
    if (count <= 0) usage(argv[0]);
    
    srand48(time(NULL));

    while (count-- > 0) {
	symbol_pos1 = (int)(drand48()*8);
	do {
	    symbol_pos2 = (int)(drand48()*8);
	} while (symbol_pos2 == symbol_pos1);

	pos = 0;
	while ( pos < 8 ) {
	restart:
	    if (pos == symbol_pos1 | pos == symbol_pos2) {
		password[pos] = symbol[(int)(drand48()*strlen(symbol))];
	    } else {
		password[pos] = alphabet[(int)(drand48()*strlen(alphabet))];
	    }
	    for (i = 0 ; i < pos ; i++) {
		if (password[i] == password[pos]) {
		    goto restart;
		}
	    }
	    pos ++;
	}
	printf("%s\n", password);
    }
   return 0;
}