/***************************************************************************** 

 MakePassword v0.3

 MakePassword genera una password lunga almeno 7 caratteri e contenente 
 almeno una lettera maiuscola, una minuscola e un numero.
 La lunghezza massima della password è MAX.

 Copyright (C) 2003 - 2006  Plinio Gatto - pli@autistici.org

 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; either version 2 of the License, or
 (at your option) any later version.

 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.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

****************************************************************************/

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

#define MAX 20 //Lunghezza massima della password

void Intro(); //Titolo
int ChkPass(char pwd[MAX], int lg); //Controlla la password
int ChkNum(char p[MAX], int len); //Controlla la presenza di numeri
int ChkHigh(char p[MAX], int len); //Controlla la presenza di maiuscole
int ChkLow(char p[MAX], int len); //Controlla la presenza di minuscole

main()
{
  int i=0,k=0,l=0;
  char chr[63],pass[MAX];
  time_t t;

  Intro();
  
  for(i=48;i<=57;i++,k++) chr[k]=i; //Indicizza da '0' a '9'
  for(i=65;i<=90;i++,k++) chr[k]=i; //Indicizza da 'A' a 'Z'
  for(i=97;i<=122;i++,k++) chr[k]=i; //Indicizza da 'a' a 'z'
  
  do{
    printf("\nInserire la lunghezza desiderata: ");
    scanf("%d",&l);
    if (l<7) printf("La password deve avere almeno 7 caratteri...\n");
    if (l>20) printf("Questo programma genera password fino a 20 caratteri...\n");
  }while ((l<7)||(l>20));
			     
  do{
    srand((unsigned)time(&t)); //Genera il seme
    for(i=0;i<l;i++) pass[i]=chr[rand()%63]; //Genera la password    
    pass[l]='\0';
  }while (!ChkPass(pass,l)); //Controlla se la password è valida
  
  printf("\nPassword generata: %s\n\n",pass);
}

void Intro(){
  printf("\nMake Password v0.3, Copiright (C) 2003 - 2006 Plinio Gatto\ne-mail: pli@autistici.org\n");
}

int ChkPass(char pwd[MAX],int lg)
{
  if (ChkNum(pwd,lg) && ChkHigh(pwd,lg) && ChkLow(pwd,lg)) return 1;
  else return 0;
} 

int ChkNum(char p[MAX], int len)
{ 
  int j=0;
  
  for(j=0;j<len;j++) if ((p[j]>=48) && (p[j]<=57)) return 1;
  return 0;
}

int ChkHigh(char p[MAX], int len)
{
  int j=0;
  
  for(j=0;j<len;j++) if ((p[j]>=65) && (p[j]<=90)) return 1;
  return 0;
}

int ChkLow(char p[MAX], int len)
{
  int j=0;
  
  for(j=0;j<len;j++) if ((p[j]>=97) && (p[j]<=122)) return 1;
  return 0;
}