ncurses

/*
320232
OSLab 2 2_1.c
Vlad Ungureanu [email protected]
*/

#include <ncurses.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

static char *rand_string (char *str, size_t size) {
    const char charset[] = "abcdefghijklmnoprstuvwxyzABDCEFGHIJKLMNOPRSTUVWXYZ";

    if (size) {
        --size;
        size_t n;
        for (n = 0; n < size; n++) {
            int key = rand() % (int) (sizeof charset -1);
            str[n] = charset[key];
        }
        str[size] = '\0';
    }
    return str;
}

static char *empty_string (char *str, size_t size) {
    size_t n;
    for (n = 0; n < size; n++)
        str[n] = ' ';
    str[size] = '\0';
    return str;
}

char* rand_string_alloc (size_t size) {
    char *s = malloc (size + 1);
    if (s) {
        srand (time(NULL));
        int tmp = rand() % 10;
        if (tmp < 7)
            rand_string(s, size);
        else empty_string(s, size);
    }
    return s;
}

void makeStrigs(char*** strings, int col) {
    (*strings) = (char**)malloc(sizeof(char*) * col);
    int x = 0;
    int y = 0;

    if((*strings) == NULL) {
        printf("Not good!");
        exit(1);
    }

    for(x = 0; x < col; x++) {
        (*strings)[x] = (char*)malloc(sizeof(char) * 1000);

        if((*strings)[x] == NULL) {
            printf("Not good!");
            exit(1);
        }

        for(y = 0; y < 1000; y++) {
            if(x % 3 != 0)
                (*strings)[x][y] = rand() % 90 + 32;
            else
                (*strings)[x][y] = ' ';
        }
    }
}

void dealloc(char** strings, int col) {
    int i;

    for(i = 0; i < col; i++)
        free(strings[i]);

    free(strings);
}

void print_matrix(char** strings, int col) {
    int x, y, ct = 0;

    while(ct != col) {
        for(x = 0; x < col; x++)
            for(y = 0; y < ct; y++)
                mvprintw(y, x, "%c", strings[x][ct-y]);
    ct++;
    refresh();
    usleep(50000);
    }
}

int main(int argc, char **argv) {
    int row, col;
    char** strings;
    srand(time(NULL));
    initscr();             /* start the curses mode */
    start_color();                         /* needed to use colors */
    init_pair(5, COLOR_GREEN, COLOR_BLACK); /* set foreground and background pair indexed as 5 */
    getmaxyx(stdscr, row, col);      /* get the number of rows and columns */
    attron(COLOR_PAIR(5));                 /* set color style to 5: magenta-black pair (see below) */
    makeStrigs(&strings, col);
    print_matrix(strings, col);
    endwin();
    return 0;
}