Ghettocode

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
 
struct card {
    char sname;
    char lname[12];
    char suit[12];
};
 
char snames[14] = "A23456789TJQK\0";
 
char *lnames[14] = {
    "Ace",
    "Two",
    "Three",
    "Four",
    "Five",
    "Six",
    "Seven",
    "Eight",
    "Nine",
    "Ten",
    "Jack",
    "Queen",
    "King",
    NULL
};
 
char *suits[5] = {
    "Clubs",
    "Diamonds",
    "Hearts",
    "Spades",
    NULL
};
 
struct card *initcards(int num);
int shufflecards(struct card *c, unsigned int count);
unsigned int leeroy(unsigned char *key, unsigned int len);
 
int main( int argc, char **argv )
{
    unsigned short int decks, cards;
    struct card *c;
    int i = 0;
 
    if (argc != 2)
        return -1;
 
    decks = atoi(argv[1]);
    cards = decks*52;
 
    printf("initializing %d deck(s) of %d cards ...\n", decks, cards);
    c = initcards(cards);
    printf("%d cards shuffled ...\n", i = shufflecards(c, cards));
 
    for (i = 0; i < cards; i++)
    {
        printf("[%c%c]\n",
                c[i].sname, c[i].suit[0]);
    }
 
    free(c);
    return 0;
}
 
struct card *initcards(int num)
{
    struct card *c;
    int j, n, s;
    c = malloc(num * sizeof(struct card));
 
    for (j = n = s = 0; j < num; j++, n++, s++)
    {
        if (s == 4) s = 0;
        if (n == 13) n = 0;
 
        c[j].sname = snames[n];
        strcpy(c[j].lname, lnames[n]);
        strcpy(c[j].suit, suits[s]);
    }
 
    return c;
}
 
int shufflecards(struct card *c, unsigned int count)
{
    time_t now;
    unsigned int seed, i;
 
    time(&now);
    seed = leeroy((unsigned char *) &now, sizeof(time_t));
    srand(seed);
 
    for (i = 0; i < count; i++)
    {
        unsigned int x;
        struct card tmp;
 
        x = (i+rand()/(RAND_MAX + 1.0) * (count - i));
/*
        printf("%c(%c) <==> %c(%c)\n", c[i].sname, c[i].suit[0],
                c[x].sname, c[x].suit[0]);
*/
        tmp  = c[i];
        c[i] = c[x];
        c[x] = tmp;
    }
 
    return i;
}
 
unsigned int leeroy(unsigned char *key, unsigned int len)
{
    unsigned int hash=0;
    unsigned int i;
 
    for (i=0; i<len; ++i)
    {
        hash+=key[i];
        hash+=(hash<<10);
        hash^=(hash>>6);
    }
 
    hash+=(hash<<3);
    hash^=(hash>>11);
    hash+=(hash<<15);
    return hash;
}