/* (c) kreator '98 */
/* password generator.. */

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

void fatal(const char *mesg)
{
	puts(mesg);
	exit(EXIT_FAILURE);
}

void help(const char *mesg)
{
	printf(
"upotreba: %s [opcije][modifikatori]

opcije:
-h	pomoc
-p	paranoicni passwordi :)
-n	normalni passwordi (default)

modifikatori:
v	velika slova
m	mala slova
a	velika i mala\n", mesg);
	exit(EXIT_SUCCESS);
}

int main(int argc, char *argv[])
{
	int c,duzina=8,i,tmp,flag=1,j,kompliciraj=0,mala=2;
	char string[1+8];
	unsigned int seed;

	while ((c=getopt(argc,argv,"hp:n:")) != -1)
	{
		switch(c)
		{
			case 'h':
				help(argv[0]); break;
			case 'p':
				kompliciraj=1;
				switch(*optarg)
				{
					case 'v': mala=0; break;
					case 'm': mala=1; break;
					case 'a': mala=2; break;
					default: help(argv[0]);
				}
				break;
			case 'n':
				kompliciraj=0;
				switch(*optarg)
				{
					case 'v': mala=0; break;
					case 'm': mala=1; break;
					case 'a': mala=2; break;
					default: help(argv[0]);
				}
				break;
			default:
				help(argv[0]);
		}
	}

	seed=((unsigned)(time(NULL)+getpid()));
	srandom(seed);

	printf("%s (c) kreator, 1998\n", argv[0]);
	if (kompliciraj) puts("PAZI! paranoicni passwordi..");
	printf("`sasvim' slucajni passwordi glase:\n");
	for(j=0;j<10;++j)
	{
		for(i=0;i<duzina;++i,flag=1) while (flag)
		{
			tmp=(int)(random()%127);
			/* all chars between 33 and 126 */
			if (kompliciraj && (tmp>=33) && (tmp<=126))
			{
				flag=0;
				if (mala==1) tmp=tolower(tmp);
					else if (!mala) tmp=toupper(tmp);
				string[i]=tmp;
			}
			/* [a-z] [A-Z] [0-9] */
			else if ((!kompliciraj) 
				&& (((tmp>='a') && (tmp<='z')) 
				|| ((tmp>='A') && (tmp<='Z')) 
				|| ((tmp>='0') && (tmp<='9'))))
			{
				flag=0;
				if (mala==1) tmp=tolower(tmp);
					else if (!mala) tmp=toupper(tmp);
				string[i]=tmp;
			}
		}
		string[8]=0;
		printf(" %2d.\t%s\n",j+1, string);
	}
	puts("od navedenih passworda izaberite *jedan*!");
	return(EXIT_SUCCESS);
}