no-more-secrets-rust/src/nms.c
Brian Barto d110aedb85 Updating/Clarifying some code comments
modified:   src/nms.c
2016-04-28 15:34:41 -04:00

283 lines
7.1 KiB
C

// Copyright (c) 2016 Brian Barto
//
// 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 3 of the License, or (at your option)
// any later version. See COPYING for more details.
#include "nms.h"
#include <stdio.h>
#include <ncurses.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <stdbool.h>
#include <time.h>
#define TAB_SIZE 4
#define TYPE_EFFECT_SPEED 4 // miliseconds per char
#define JUMBLE_SECONDS 2 // number of seconds for jumble effect
#define JUMBLE_LOOP_SPEED 35 // miliseconds between each jumble
#define REVEAL_LOOP_SPEED 100 // miliseconds (must be evenly divisible by 5)
#define SPACE 32
#define NEWLINE 10
#define TAB 9
// Window position structure, linked list. Keeps track of every
// character's position on the terminal, as well as other attributes.
struct winpos {
char source;
char mask;
int row;
int col;
int s1_time;
int s2_time;
struct winpos *next;
};
// Function prototypes (internal)
char getMaskChar(void);
/*
* void nms_exec(NmsArgs *)
*
* DESCR:
* Performs "decryption" effect,
*
* ARGS:
* NmsArgs *args - Pointer to argument structure
*
* STRUCTURE MEMBERS:
* args.src - Pointer to string on which to perform the effect
* args.return_opts - Pointer to string containing character options for menu
* args.input_cursor_x - X screen coordinate to place cursor after "decryption"
* args.input_cursor_y - Y screen coordinate to place cursor after "decryption"
* args.show_cursor - 'true' to display cursor, 'false' to hide cursor.
*
*/
char nms_exec(NmsArgs *args) {
struct winpos *list_pointer = NULL;
struct winpos *start; // Always points to start of list
struct winpos *temp; // Used for free()ing the list
int termSizeRows, termSizeCols;
int c, n, x = 0, y = 0;
int r_time, r_time_l, r_time_s;
int ms, ls;
bool first = true;
char ret = 0;
// Start and initialize curses mode
initscr();
cbreak();
noecho();
scrollok(stdscr, true);
if (args->show_cursor == false)
curs_set(0);
// Setting up and starting colors if terminal supports them
if (has_colors()) {
start_color();
init_pair(1, COLOR_BLUE, COLOR_BLACK);
}
// Get terminal window size
getmaxyx(stdscr, termSizeRows, termSizeCols);
// Seed my random number generator with the current time
srand(time(NULL));
// Geting input
n = 0;
while ((c = args->src[n++]) != '\0') {
if (c == NEWLINE) {
++y;
x = 0;
} else if (c == TAB && x + TAB_SIZE <= termSizeCols) {
x += TAB_SIZE;
} else if (isspace(c)) {
if (++x > termSizeCols) {
++y;
x = 0;
}
} else {
if (first) {
list_pointer = malloc(sizeof(struct winpos));
start = list_pointer;
first = false;
} else {
list_pointer->next = malloc(sizeof(struct winpos));
list_pointer = list_pointer->next;
}
r_time = rand() % 50;
r_time_s = r_time * .25;
r_time_l = r_time * .75;
r_time *= 100;
r_time_s *= 100;
r_time_l *= 100;
list_pointer->source = c;
list_pointer->mask = getMaskChar();
list_pointer->row = y;
list_pointer->col = x;
list_pointer->s1_time = r_time > 1000 ? r_time_l : r_time;
list_pointer->s2_time = r_time > 1000 ? r_time_s : 0;
list_pointer->next = NULL;
if (++x > termSizeCols) {
++y;
x = 0;
}
}
}
// Initially display the characters in the terminal with a 'type effect'.
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
mvaddch(list_pointer->row, list_pointer->col, list_pointer->mask);
refresh();
list_pointer->mask = getMaskChar();
list_pointer = list_pointer->next;
usleep(TYPE_EFFECT_SPEED * 1000);
}
// Flush any input up to this point
flushinp();
// Reopen stdin for interactive input (keyboard), then require user
// to press a key to continue.
if (!isatty(STDIN_FILENO))
if (!freopen ("/dev/tty", "r", stdin))
sleep(1);
else
getch();
else
getch();
// Jumble loop
x = 0;
while (x < (JUMBLE_SECONDS * 1000) / JUMBLE_LOOP_SPEED) {
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
mvaddch(list_pointer->row, list_pointer->col, list_pointer->mask);
refresh();
list_pointer->mask = getMaskChar();
list_pointer = list_pointer->next;
}
usleep(JUMBLE_LOOP_SPEED * 1000);
++x;
}
// Reveal loop
int s1_remask_time = 500; // time, in milliseconds, we change the mask for stage 1
bool loop = true;
while (loop) {
loop = false;
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
if (list_pointer->s1_time > 0) {
loop = true;
list_pointer->s1_time -= REVEAL_LOOP_SPEED;
if (list_pointer->s1_time % s1_remask_time == 0) {
list_pointer->mask = getMaskChar();
}
} else if (list_pointer->s2_time > 0) {
loop = true;
list_pointer->s2_time -= REVEAL_LOOP_SPEED;
list_pointer->mask = getMaskChar();
} else {
list_pointer->mask = list_pointer->source;
attron(A_BOLD);
if (has_colors())
attron(COLOR_PAIR(1));
}
mvaddch(list_pointer->row, list_pointer->col, list_pointer->mask);
refresh();
list_pointer = list_pointer->next;
attroff(A_BOLD);
if (has_colors())
attroff(COLOR_PAIR(1));
}
usleep(REVEAL_LOOP_SPEED * 1000);
}
// Printing remaining characters from list if we stopped short due to
// a terminal row limitation. i.e. the number of textual rows in the input
// stream were greater than the number of rows in the terminal.
int prevRow;
if (list_pointer != NULL) {
attron(A_BOLD);
if (has_colors())
attron(COLOR_PAIR(1));
prevRow = list_pointer->row;
scroll(stdscr);
while (list_pointer != NULL) {
while (list_pointer->row > prevRow) {
scroll(stdscr);
++prevRow;
}
mvaddch(termSizeRows -1, list_pointer->col, list_pointer->source);
refresh();
//mvaddch(0, 0, list_pointer->source);
list_pointer = list_pointer->next;
}
attroff(A_BOLD);
if (has_colors())
attroff(COLOR_PAIR(1));
}
// Flush any input up to this point
flushinp();
// Position cursor
if (args->input_cursor_y >= 0 && args->input_cursor_x >= 0) {
move(args->input_cursor_y, args->input_cursor_x);
curs_set(1);
}
// If stdin is set to the keyboard, user must press a key to continue
if (isatty(STDIN_FILENO)) {
ret = getch();
if (args->return_opts != NULL && strlen(args->return_opts) > 0)
while (index(args->return_opts, ret) == NULL) {
beep();
ret = getch();
}
} else
sleep(2);
// End curses mode
endwin();
// Freeing the list.
list_pointer = start;
while (list_pointer != NULL) {
temp = list_pointer;
list_pointer = list_pointer->next;
free(temp);
}
return ret;
}
/*
* char getMaskChar(void)
*
* DESCR:
* Returns a random character from the maskChars string.
*
*/
char getMaskChar(void) {
char *maskChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"1234567890"
"!@#$%^&*()-_=+{}[]:;|\\\"'<>,.?/";
return maskChars[rand() % strlen(maskChars)];
}