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modified:   Makefile
	modified:   README.md
	renamed:    src/nms.c -> src/main.c
	renamed:    src/libnms.c -> src/nms.c
	renamed:    src/libnms.h -> src/nms.h
	modified:   src/sneakers.c
This commit is contained in:
Brian Barto 2017-01-16 16:28:12 -05:00
parent 4d7706c907
commit 1c65c9a218
7 changed files with 713 additions and 692 deletions
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4
Makefile
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@ -20,10 +20,10 @@ CFLAGS ?= -Wextra -Wall
EXES = nms sneakers EXES = nms sneakers
all: $(EXES) all: $(EXES)
nms: $(OBJ)/libnms.o $(OBJ)/nms.o | $(BIN) nms: $(OBJ)/nms.o $(OBJ)/main.o | $(BIN)
$(CC) $(CFLAGS) -o $(BIN)/$@ $^ $(CC) $(CFLAGS) -o $(BIN)/$@ $^
sneakers: $(OBJ)/libnms.o $(OBJ)/sneakers.o | $(BIN) sneakers: $(OBJ)/nms.o $(OBJ)/sneakers.o | $(BIN)
$(CC) $(CFLAGS) -o $(BIN)/$@ $^ $(CC) $(CFLAGS) -o $(BIN)/$@ $^
$(OBJ)/%.o: $(SRC)/%.c | $(OBJ) $(OBJ)/%.o: $(SRC)/%.c | $(OBJ)

10
README.md
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@ -70,6 +70,7 @@ enjoy the magic. In the below examples, I use a simple directory listing.
ls -l | nms ls -l | nms
ls -l | nms -a // Set auto-decrypt flag ls -l | nms -a // Set auto-decrypt flag
ls -l | nms -f green // Set foreground color to green ls -l | nms -f green // Set foreground color to green
ls -l | nms -r 123456 // Set return options
ls -l | nms -c // Clear screen ls -l | nms -c // Clear screen
nms -v // Display version nms -v // Display version
``` ```
@ -85,12 +86,19 @@ sequence. This is how the decryption functionality is depicted in the movie.
Set the auto-decrypt flag. This will automatically start the Set the auto-decrypt flag. This will automatically start the
decryption sequence without requiring a key press. decryption sequence without requiring a key press.
`-f color` `-f <color>`
Set the foreground color of the decrypted text to the color Set the foreground color of the decrypted text to the color
specified. Valid options are white, yellow, black, magenta, blue, green, specified. Valid options are white, yellow, black, magenta, blue, green,
or red. This is blue by default. or red. This is blue by default.
`-r <options>`
Sets the character options that `nms` requires the user to choose from
before it terminates execution. This is intended to be used for cases
where the data piped to `nms` contains a menu with a set of options. Note
that `nms` will print the selection to stdout before terminating.
`-c` `-c`
Clear the screen prior to printing any output. Specifically, Clear the screen prior to printing any output. Specifically,

638
src/libnms.c
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@ -1,638 +0,0 @@
/*
* Copyright (c) 2016 Brian Barto
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the MIT License. See LICENSE for more details.
*/
/*
* DESCRIPTION
*
* The libnms library encapsulates the functuionality required to produce the
* famous "decrypting text" sceen effect from the 1992 hacker movie "Sneakers".
* For more, go to: https://github.com/bartobri/libnms
*/
#define _XOPEN_SOURCE 700
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <ctype.h>
#include <stdbool.h>
#include <time.h>
#include <locale.h>
#include <wchar.h>
#include "libnms.h"
// Color identifiers
#define COLOR_BLACK 0
#define COLOR_RED 1
#define COLOR_GREEN 2
#define COLOR_YELLOW 3
#define COLOR_BLUE 4
#define COLOR_MAGENTA 5
#define COLOR_CYAN 6
#define COLOR_WHITE 7
// Macros for VT100 codes
#define CLEAR_SCR() printf("\033[2J") // Clear Screen
#define CURSOR_HOME() printf("\033[H") // Move cursor to home position (0,0)
#define CURSOR_MOVE(x,y) printf("\033[%i;%iH", x, y) // Move cursor to x,y
#define BEEP() printf("\a"); // terminal bell
#define BOLD() printf("\033[1m") // Cursor bold
#define FOREGROUND_COLOR(x) printf("\033[3%im", x) // Set foreground color
#define CLEAR_ATTR() printf("\033[0m") // Clear bold/color attributes
#define SCREEN_SAVE() printf("\033[?47h") // Save screen display
#define SCREEN_RESTORE() printf("\033[?47l") // Restore screen to previously saved state
#define CURSOR_SAVE() printf("\033[s") // Save cursor position
#define CURSOR_RESTORE() printf("\033[u") // Restore cursor position
#define CURSOR_HIDE() printf("\033[?25l") // Hide cursor
#define CURSOR_SHOW() printf("\033[?25h") // Unhide cursor
// Program settings
#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 50 // miliseconds between each reveal loop
#define MASK_CHAR_COUNT 218 // Total characters in maskCharTable[] array.
// Character attribute structure, linked list. Keeps track of every
// character's attributes required for rendering and decryption effect.
struct charAttr {
char *source;
char *mask;
int width;
int is_space;
int time;
struct charAttr *next;
};
// Static function prototypes
static void nms_sleep(int);
static int nms_term_rows(void);
static int nms_term_cols(void);
static void nms_set_terminal(int s);
static void nms_clear_input(void);
static char nms_get_char(void);
static int nms_get_cursor_row(void);
// NMS settings
static int foregroundColor = COLOR_BLUE; // Foreground color setting
static char *returnOpts = NULL; // Return option setting
static int autoDecrypt = 0; // Auto-decrypt flag
static int clearScr = 0; // clearScr flag
static int colorOn = 1; // Terminal color flag
static int inputPositionX = -1; // X coordinate for input position
static int inputPositionY = -1; // Y coordinate for input position
// Character table representing the character set know as CP437 used by
// the original IBM PC - https://en.wikipedia.org/wiki/Code_page_437
static char *maskCharTable[] = {
"!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", "~",
".", "/", ":", ";", "<", "=", ">", "?", "[", "\\", "]", "_", "{", "}",
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"\xc3\x87", "\xc3\xbc", "\xc3\xa9", "\xc3\xa2", "\xc3\xa4", "\xc3\xa0",
"\xc3\xa5", "\xc3\xa7", "\xc3\xaa", "\xc3\xab", "\xc3\xa8", "\xc3\xaf",
"\xc3\xae", "\xc3\xac", "\xc3\x84", "\xc3\x85", "\xc3\x89", "\xc3\xa6",
"\xc3\x86", "\xc3\xb4", "\xc3\xb6", "\xc3\xb2", "\xc3\xbb", "\xc3\xb9",
"\xc3\xbf", "\xc3\x96", "\xc3\x9c", "\xc2\xa2", "\xc2\xa3", "\xc2\xa5",
"\xc6\x92", "\xc3\xa1", "\xc3\xad", "\xc3\xb3", "\xc3\xba", "\xc3\xb1",
"\xc3\x91", "\xc2\xaa", "\xc2\xba", "\xc2\xbf", "\xc2\xac", "\xc2\xbd",
"\xc2\xbc", "\xc2\xa1", "\xc2\xab", "\xc2\xbb", "\xce\xb1", "\xc3\x9f",
"\xce\x93", "\xcf\x80", "\xce\xa3", "\xcf\x83", "\xc2\xb5", "\xcf\x84",
"\xce\xa6", "\xce\x98", "\xce\xa9", "\xce\xb4", "\xcf\x86", "\xce\xb5",
"\xc2\xb1", "\xc3\xb7", "\xc2\xb0", "\xc2\xb7", "\xc2\xb2", "\xc2\xb6",
"\xe2\x8c\x90", "\xe2\x82\xa7", "\xe2\x96\x91", "\xe2\x96\x92",
"\xe2\x96\x93", "\xe2\x94\x82", "\xe2\x94\xa4", "\xe2\x95\xa1",
"\xe2\x95\xa2", "\xe2\x95\x96", "\xe2\x95\x95", "\xe2\x95\xa3",
"\xe2\x95\x91", "\xe2\x95\x97", "\xe2\x95\x9d", "\xe2\x95\x9c",
"\xe2\x95\x9b", "\xe2\x94\x90", "\xe2\x94\x94", "\xe2\x94\xb4",
"\xe2\x94\xac", "\xe2\x94\x9c", "\xe2\x94\x80", "\xe2\x94\xbc",
"\xe2\x95\x9e", "\xe2\x95\x9f", "\xe2\x95\x9a", "\xe2\x95\x94",
"\xe2\x95\xa9", "\xe2\x95\xa6", "\xe2\x95\xa0", "\xe2\x95\x90",
"\xe2\x95\xac", "\xe2\x95\xa7", "\xe2\x95\xa8", "\xe2\x95\xa4",
"\xe2\x95\xa7", "\xe2\x95\x99", "\xe2\x95\x98", "\xe2\x95\x92",
"\xe2\x95\x93", "\xe2\x95\xab", "\xe2\x95\xaa", "\xe2\x94\x98",
"\xe2\x94\x8c", "\xe2\x96\x88", "\xe2\x96\x84", "\xe2\x96\x8c",
"\xe2\x96\x90", "\xe2\x96\x80", "\xe2\x88\x9e", "\xe2\x88\xa9",
"\xe2\x89\xa1", "\xe2\x89\xa5", "\xe2\x89\xa4", "\xe2\x8c\xa0",
"\xe2\x8c\xa1", "\xe2\x89\x88", "\xe2\x88\x99", "\xe2\x88\x9a",
"\xe2\x81\xbf", "\xe2\x96\xa0"
};
/*
* nms_exec() - This function is passed a pointer to a character string
* and displays the contents of the string in a way that mimicks the
* "decrypting text" effect in the 1992 movie Sneakers. It returns the
* last character pressed by the user.
*/
char nms_exec(char *string) {
struct charAttr *list_pointer = NULL;
struct charAttr *list_head = NULL;
struct charAttr *list_temp = NULL;
int i, revealed = 0;
int maxRows, maxCols, curRow, curCol, origRow = 0, origCol = 0;
char ret = 0;
// Error if we have an empty string.
if (string == NULL || string[0] == '\0') {
fprintf(stderr, "Error. Empty string.\n");
return 0;
}
// Reassociate STDIN to the terminal is needed
if (!isatty(STDIN_FILENO) && !freopen ("/dev/tty", "r", stdin)) {
fprintf(stderr, "Error. Can't associate STDIN with terminal.\n");
return 0;
}
// Turn off terminal echo and line buffering
nms_set_terminal(0);
// Needed for UTF-8 support
setlocale(LC_ALL, "");
// Get terminal window rows/cols
maxRows = nms_term_rows();
maxCols = nms_term_cols();
// Seed my random number generator with the current time
srand(time(NULL));
// Get cursor position if we are not clearing the screen
if (!clearScr) {
origRow = nms_get_cursor_row();
// nms_get_cursor_row() may display output in some terminals. So
// we need to reposition the cursor to the start of the row.
CURSOR_MOVE(origRow, origCol);
}
// Assign current row/col positions
curRow = origRow;
curCol = origCol;
// Geting input
for (i = 0; string[i] != '\0'; ++i) {
// Don't go beyond maxRows
if (curRow - origRow >= maxRows - 1) {
break;
}
// Allocate memory for next list link
if (list_pointer == NULL) {
list_pointer = malloc(sizeof(struct charAttr));
list_head = list_pointer;
} else {
list_pointer->next = malloc(sizeof(struct charAttr));
list_pointer = list_pointer->next;
}
// Get character's byte-length and store character.
if (mblen(&string[i], 4) > 0) {
list_pointer->source = malloc(mblen(&string[i], 4) + 1);
strncpy(list_pointer->source, &string[i], mblen(&string[i], 4));
list_pointer->source[mblen(&string[i], 4)] = '\0';
i += (mblen(&string[i], 4) - 1);
} else {
fprintf(stderr, "Unknown character encountered. Quitting.\n");
nms_set_terminal(1);
return 0;
}
// Set flag if we have a whitespace character
if (strlen(list_pointer->source) == 1 && isspace(list_pointer->source[0]))
list_pointer->is_space = 1;
else
list_pointer->is_space = 0;
// Set initial mask chharacter
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
// Set reveal time
list_pointer->time = rand() % 5000;
// Set character column width
wchar_t widec[sizeof(list_pointer->source)] = {};
mbstowcs(widec, list_pointer->source, sizeof(list_pointer->source));
list_pointer->width = wcwidth(*widec);
// Set next node to null
list_pointer->next = NULL;
// Track row count
if (string[i] == '\n' || (curCol += list_pointer->width) > maxCols) {
curCol = 0;
curRow++;
if (curRow == maxRows + 1 && origRow > 0) {
origRow--;
curRow--;
}
}
}
// Save terminal state, clear screen, and home/hide the cursor
if (clearScr) {
CURSOR_SAVE();
SCREEN_SAVE();
CLEAR_SCR();
CURSOR_HOME();
CURSOR_HIDE();
}
// Print mask characters with 'type effect'
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// print mask character
printf("%s", list_pointer->mask);
if (list_pointer->width == 2) {
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
}
// flush output and sleep
fflush(stdout);
nms_sleep(TYPE_EFFECT_SPEED);
}
// Flush any input up to this point
nms_clear_input();
// If autoDecrypt flag is set, we sleep. Otherwise require user to
// press a key to continue.
if (autoDecrypt)
sleep(1);
else
nms_get_char();
// Jumble loop
for (i = 0; i < (JUMBLE_SECONDS * 1000) / JUMBLE_LOOP_SPEED; ++i) {
// Move cursor to home position
if (clearScr) {
CURSOR_HOME();
} else {
CURSOR_MOVE(origRow, origCol);
}
// Print new mask for all characters
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// print new mask character
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
if (list_pointer->width == 2) {
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
}
}
// flush output and sleep
fflush(stdout);
nms_sleep(JUMBLE_LOOP_SPEED);
}
// Reveal loop
while (!revealed) {
// Move cursor to home position
if (clearScr) {
CURSOR_HOME();
} else {
CURSOR_MOVE(origRow, origCol);
}
// Set revealed flag
revealed = 1;
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// If we still have time before the char is revealed, display the mask
if (list_pointer->time > 0) {
// Change the mask randomly
if (list_pointer->time < 500) {
if (rand() % 3 == 0) {
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
}
} else {
if (rand() % 10 == 0) {
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
}
}
// Print mask
printf("%s", list_pointer->mask);
// Decrement reveal time
list_pointer->time -= REVEAL_LOOP_SPEED;
// Unset revealed flag
revealed = 0;
} else {
// Set bold and foreground color for character reveal
BOLD();
if (colorOn) {
FOREGROUND_COLOR(foregroundColor);
}
// print source character
printf("%s", list_pointer->source);
// Unset foreground color
CLEAR_ATTR();
}
}
// flush output and sleep
fflush(stdout);
nms_sleep(REVEAL_LOOP_SPEED);
}
// Flush any input up to this point
nms_clear_input();
// Check if user must select from a set of options
if (returnOpts != NULL && strlen(returnOpts) > 0) {
// Position cursor if necessary
if (inputPositionY >= 0 && inputPositionX >= 0) {
CURSOR_MOVE(inputPositionY, inputPositionX);
}
CURSOR_SHOW();
// Get and validate user selection
while (strchr(returnOpts, ret = nms_get_char()) == NULL) {
BEEP();
}
}
// User must press a key to continue when clearSrc is set
// without returnOpts
else if (clearScr) {
nms_get_char();
}
// Restore screen and cursor is clearSrc is set
if (clearScr) {
SCREEN_RESTORE();
CURSOR_SHOW();
CURSOR_RESTORE();
}
// Turn on terminal echo and line buffering
nms_set_terminal(1);
// Freeing the list.
list_pointer = list_head;
while (list_pointer != NULL) {
list_temp = list_pointer;
list_pointer = list_pointer->next;
free(list_temp->source);
free(list_temp);
}
return ret;
}
/*
* nms_set_foreground_color() sets the foreground color of the unencrypted
* characters as they are revealed to the color indicated by the 'color'
* argument. Valid arguments are "white", "yellow", "magenta", "blue",
* "green", "red", and "cyan". This function will default to blue if
* passed an invalid color. No value is returned.
*/
void nms_set_foreground_color(char *color) {
if(strcmp("white", color) == 0)
foregroundColor = COLOR_WHITE;
else if(strcmp("yellow", color) == 0)
foregroundColor = COLOR_YELLOW;
else if(strcmp("black", color) == 0)
foregroundColor = COLOR_BLACK;
else if(strcmp("magenta", color) == 0)
foregroundColor = COLOR_MAGENTA;
else if(strcmp("blue", color) == 0)
foregroundColor = COLOR_BLUE;
else if(strcmp("green", color) == 0)
foregroundColor = COLOR_GREEN;
else if(strcmp("red", color) == 0)
foregroundColor = COLOR_RED;
else if(strcmp("cyan", color) == 0)
foregroundColor = COLOR_CYAN;
else
foregroundColor = COLOR_BLUE;
}
/*
* nms_set_return_opts() takes a character sting and copies it to the
* returnOpts setting used by nms_exec().
*/
void nms_set_return_opts(char *opts) {
returnOpts = realloc(returnOpts, strlen(opts) + 1);
strcpy(returnOpts, opts);
}
/*
* nms_set_auto_decrypt() sets the autoDecrypt flag according to the
* true/false value of the 'setting' argument.
*/
void nms_set_auto_decrypt(int setting) {
if (setting)
autoDecrypt = 1;
else
autoDecrypt = 0;
}
/*
* nms_set_clear_scr() sets the clearScr flag according to the
* true/false value of the 'setting' argument.
*/
void nms_set_clear_scr(int setting) {
if (setting)
clearScr = 1;
else
clearScr = 0;
}
/*
* nms_set_color() sets the colorOn flag according to the
* true/false value of the 'setting' argument.
*/
void nms_use_color(int setting) {
if (setting)
colorOn = 1;
else
colorOn = 0;
}
/*
* nms_set_input_position() sets the desired coordinate of the cursor in
* the terminal when accepting user input after nms_exec() reveals the
* unencrypted characters.
*/
void nms_set_input_position(int x, int y) {
if (x >= 0 && y >= 0) {
inputPositionX = x;
inputPositionY = y;
}
}
/*
* nms_sleep() sleeps for the number of miliseconds indicated by 't'.
*/
static void nms_sleep(int t) {
struct timespec ts;
ts.tv_sec = t / 1000;
ts.tv_nsec = (t % 1000) * 1000000;
nanosleep(&ts, NULL);
}
/*
* nms_term_rows() gets and returns the number of rows in the current
* terminal window.
*/
static int nms_term_rows(void) {
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
return w.ws_row;
}
/*
* nms_term_cols() gets and returns the number of cols in the current
* terminal window.
*/
static int nms_term_cols(void) {
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
return w.ws_col;
}
/*
* nms_set_terminal() turns off terminal echo and line buffering when
* passed an integer value that evaluates to true. It restores the
* original terminal values when passed an integer value that evaluates
* to false.
*/
static void nms_set_terminal(int s) {
struct termios tp;
static struct termios save;
static int state = 1;
if (s == 0) {
if (tcgetattr(STDIN_FILENO, &tp) == -1) {
return;
}
save = tp;
tp.c_lflag &=(~ICANON & ~ECHO);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tp) == -1) {
return;
}
} else {
if (state == 0 && tcsetattr(STDIN_FILENO, TCSANOW, &save) == -1)
return;
}
state = s;
}
/*
* nms_clear_input() clears the input buffer of all characters up to
* the EOF character.
*/
static void nms_clear_input(void) {
int i;
ioctl(STDIN_FILENO, FIONREAD, &i);
while (i > 0) {
getchar();
--i;
}
}
/*
* nms_get_char() returns the next character in the input buffer. In the
* case of an EOF character, it blocks until the user presses a key.
*/
static char nms_get_char(void) {
struct timespec ts;
int t = 50;
char c;
ts.tv_sec = t / 1000;
ts.tv_nsec = (t % 1000) * 1000000;
while ((c = getchar()) == EOF) {
nanosleep(&ts, NULL);
}
return c;
}
/*
* nms_get_cursor_row() returns the row position of the cursor as reported
* by the terminal program via the ANSI escape code
*/
static int nms_get_cursor_row(void) {
int i, r = 0;
int row = 0;
char buf[10];
char *cmd = "\033[6n";
memset(buf, 0, sizeof(buf));
write(STDOUT_FILENO, cmd, sizeof(cmd));
r = read(STDIN_FILENO, buf, sizeof(buf));
for (i = 0; i < r; ++i) {
if (buf[i] == 27 || buf[i] == '[') {
continue;
}
if (buf[i] >= '0' && buf[i] <= '9') {
row = (row * 10) + (buf[i] - '0');
}
if (buf[i] == ';' || buf[i] == 'R' || buf[i] == 0) {
break;
}
}
return row;
}

68
src/main.c Normal file
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@ -0,0 +1,68 @@
/*
* Copyright (c) 2017 Brian Barto
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the MIT License. See LICENSE for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include "nms.h"
#define VERSION "0.3.0"
#define INPUT_GROWTH_FACTOR 2
int main(int argc, char *argv[]) {
int c, o, inSize = 0, inCapacity = 0;
char *input = NULL;
// Processing command arguments
while ((o = getopt(argc, argv, "f:ac:v")) != -1) {
switch (o) {
case 'f':
nms_set_foreground_color(optarg);
break;
case 'a':
nms_set_auto_decrypt(1);
break;
case 'c':
nms_set_clear_scr(1);
break;
case 'v':
printf("nms version " VERSION "\n");
return 0;
case '?':
if (isprint(optopt))
fprintf (stderr, "Unknown option '-%c'.\n", optopt);
else
fprintf (stderr, "Unknown option character '\\x%x'.\n", optopt);
return 1;
}
}
// Geting input
while ((c = getchar()) != EOF) {
++inSize;
if (inSize > inCapacity) {
inCapacity = inCapacity == 0 ? INPUT_GROWTH_FACTOR : inCapacity * INPUT_GROWTH_FACTOR;
input = realloc(input, inCapacity + 1);
}
input[inSize - 1] = c;
input[inSize] = '\0';
}
// Display characters
c = nms_exec(input);
// Print out from nms_exec if it is not null
if (c) {
printf("%c", c);
}
// Don't forget to free the allocated memory!
free(input);
return 0;
}

670
src/nms.c
View File

@ -1,61 +1,637 @@
/*
* Copyright (c) 2017 Brian Barto
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the MIT License. See LICENSE for more details.
*/
/*
* DESCRIPTION
*
* This library encapsulates the functionality required to produce the
* famous data decryption effect from the 1992 hacker movie Sneakers.
*/
#define _XOPEN_SOURCE 700
#include <stdio.h> #include <stdio.h>
#include <string.h>
#include <stdlib.h> #include <stdlib.h>
#include <termios.h>
#include <unistd.h> #include <unistd.h>
#include <sys/ioctl.h>
#include <ctype.h> #include <ctype.h>
#include "libnms.h" #include <stdbool.h>
#include <time.h>
#include <locale.h>
#include <wchar.h>
#include "nms.h"
#define VERSION "0.3.0" // Color identifiers
#define INPUT_GROWTH_FACTOR 2 #define COLOR_BLACK 0
#define COLOR_RED 1
#define COLOR_GREEN 2
#define COLOR_YELLOW 3
#define COLOR_BLUE 4
#define COLOR_MAGENTA 5
#define COLOR_CYAN 6
#define COLOR_WHITE 7
int main(int argc, char *argv[]) { // Macros for VT100 codes
int c, o, inSize = 0, inCapacity = 0; #define CLEAR_SCR() printf("\033[2J") // Clear Screen
char *input = NULL; #define CURSOR_HOME() printf("\033[H") // Move cursor to home position (0,0)
#define CURSOR_MOVE(x,y) printf("\033[%i;%iH", x, y) // Move cursor to x,y
#define BEEP() printf("\a"); // terminal bell
#define BOLD() printf("\033[1m") // Cursor bold
#define FOREGROUND_COLOR(x) printf("\033[3%im", x) // Set foreground color
#define CLEAR_ATTR() printf("\033[0m") // Clear bold/color attributes
#define SCREEN_SAVE() printf("\033[?47h") // Save screen display
#define SCREEN_RESTORE() printf("\033[?47l") // Restore screen to previously saved state
#define CURSOR_SAVE() printf("\033[s") // Save cursor position
#define CURSOR_RESTORE() printf("\033[u") // Restore cursor position
#define CURSOR_HIDE() printf("\033[?25l") // Hide cursor
#define CURSOR_SHOW() printf("\033[?25h") // Unhide cursor
// Processing command arguments // Program settings
while ((o = getopt(argc, argv, "f:acv")) != -1) { #define TYPE_EFFECT_SPEED 4 // miliseconds per char
switch (o) { #define JUMBLE_SECONDS 2 // number of seconds for jumble effect
case 'f': #define JUMBLE_LOOP_SPEED 35 // miliseconds between each jumble
nms_set_foreground_color(optarg); #define REVEAL_LOOP_SPEED 50 // miliseconds between each reveal loop
break; #define MASK_CHAR_COUNT 218 // Total characters in maskCharTable[] array.
case 'a':
nms_set_auto_decrypt(1);
break;
case 'c':
nms_set_clear_scr(1);
break;
case 'v':
printf("nms version " VERSION "\n");
return 0;
case '?':
if (isprint(optopt))
fprintf (stderr, "Unknown option '-%c'.\n", optopt);
else
fprintf (stderr, "Unknown option character '\\x%x'.\n", optopt);
return 1;
}
}
// Geting input // Character attribute structure, linked list. Keeps track of every
while ((c = getchar()) != EOF) { // character's attributes required for rendering and decryption effect.
++inSize; struct charAttr {
if (inSize > inCapacity) { char *source;
inCapacity = inCapacity == 0 ? INPUT_GROWTH_FACTOR : inCapacity * INPUT_GROWTH_FACTOR; char *mask;
input = realloc(input, inCapacity + 1); int width;
} int is_space;
input[inSize - 1] = c; int time;
input[inSize] = '\0'; struct charAttr *next;
};
// Static function prototypes
static void nms_sleep(int);
static int nms_term_rows(void);
static int nms_term_cols(void);
static void nms_set_terminal(int s);
static void nms_clear_input(void);
static char nms_get_char(void);
static int nms_get_cursor_row(void);
// NMS settings
static int foregroundColor = COLOR_BLUE; // Foreground color setting
static char *returnOpts = NULL; // Return option setting
static int autoDecrypt = 0; // Auto-decrypt flag
static int clearScr = 0; // clearScr flag
static int colorOn = 1; // Terminal color flag
static int inputPositionX = -1; // X coordinate for input position
static int inputPositionY = -1; // Y coordinate for input position
// Character table representing the character set know as CP437 used by
// the original IBM PC - https://en.wikipedia.org/wiki/Code_page_437
static char *maskCharTable[] = {
"!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", "~",
".", "/", ":", ";", "<", "=", ">", "?", "[", "\\", "]", "_", "{", "}",
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"\xc3\x87", "\xc3\xbc", "\xc3\xa9", "\xc3\xa2", "\xc3\xa4", "\xc3\xa0",
"\xc3\xa5", "\xc3\xa7", "\xc3\xaa", "\xc3\xab", "\xc3\xa8", "\xc3\xaf",
"\xc3\xae", "\xc3\xac", "\xc3\x84", "\xc3\x85", "\xc3\x89", "\xc3\xa6",
"\xc3\x86", "\xc3\xb4", "\xc3\xb6", "\xc3\xb2", "\xc3\xbb", "\xc3\xb9",
"\xc3\xbf", "\xc3\x96", "\xc3\x9c", "\xc2\xa2", "\xc2\xa3", "\xc2\xa5",
"\xc6\x92", "\xc3\xa1", "\xc3\xad", "\xc3\xb3", "\xc3\xba", "\xc3\xb1",
"\xc3\x91", "\xc2\xaa", "\xc2\xba", "\xc2\xbf", "\xc2\xac", "\xc2\xbd",
"\xc2\xbc", "\xc2\xa1", "\xc2\xab", "\xc2\xbb", "\xce\xb1", "\xc3\x9f",
"\xce\x93", "\xcf\x80", "\xce\xa3", "\xcf\x83", "\xc2\xb5", "\xcf\x84",
"\xce\xa6", "\xce\x98", "\xce\xa9", "\xce\xb4", "\xcf\x86", "\xce\xb5",
"\xc2\xb1", "\xc3\xb7", "\xc2\xb0", "\xc2\xb7", "\xc2\xb2", "\xc2\xb6",
"\xe2\x8c\x90", "\xe2\x82\xa7", "\xe2\x96\x91", "\xe2\x96\x92",
"\xe2\x96\x93", "\xe2\x94\x82", "\xe2\x94\xa4", "\xe2\x95\xa1",
"\xe2\x95\xa2", "\xe2\x95\x96", "\xe2\x95\x95", "\xe2\x95\xa3",
"\xe2\x95\x91", "\xe2\x95\x97", "\xe2\x95\x9d", "\xe2\x95\x9c",
"\xe2\x95\x9b", "\xe2\x94\x90", "\xe2\x94\x94", "\xe2\x94\xb4",
"\xe2\x94\xac", "\xe2\x94\x9c", "\xe2\x94\x80", "\xe2\x94\xbc",
"\xe2\x95\x9e", "\xe2\x95\x9f", "\xe2\x95\x9a", "\xe2\x95\x94",
"\xe2\x95\xa9", "\xe2\x95\xa6", "\xe2\x95\xa0", "\xe2\x95\x90",
"\xe2\x95\xac", "\xe2\x95\xa7", "\xe2\x95\xa8", "\xe2\x95\xa4",
"\xe2\x95\xa7", "\xe2\x95\x99", "\xe2\x95\x98", "\xe2\x95\x92",
"\xe2\x95\x93", "\xe2\x95\xab", "\xe2\x95\xaa", "\xe2\x94\x98",
"\xe2\x94\x8c", "\xe2\x96\x88", "\xe2\x96\x84", "\xe2\x96\x8c",
"\xe2\x96\x90", "\xe2\x96\x80", "\xe2\x88\x9e", "\xe2\x88\xa9",
"\xe2\x89\xa1", "\xe2\x89\xa5", "\xe2\x89\xa4", "\xe2\x8c\xa0",
"\xe2\x8c\xa1", "\xe2\x89\x88", "\xe2\x88\x99", "\xe2\x88\x9a",
"\xe2\x81\xbf", "\xe2\x96\xa0"
};
/*
* nms_exec() - This function is passed a pointer to a character string
* and displays the contents of the string in a way that mimicks the
* "decrypting text" effect in the 1992 movie Sneakers. It returns the
* last character pressed by the user.
*/
char nms_exec(char *string) {
struct charAttr *list_pointer = NULL;
struct charAttr *list_head = NULL;
struct charAttr *list_temp = NULL;
int i, revealed = 0;
int maxRows, maxCols, curRow, curCol, origRow = 0, origCol = 0;
char ret = 0;
// Error if we have an empty string.
if (string == NULL || string[0] == '\0') {
fprintf(stderr, "Error. Empty string.\n");
return 0;
} }
//nms_set_input_position(5,5); // Reassociate STDIN to the terminal is needed
//nms_set_return_opts("123456"); if (!isatty(STDIN_FILENO) && !freopen ("/dev/tty", "r", stdin)) {
//nms_set_clear_scr(0); fprintf(stderr, "Error. Can't associate STDIN with terminal.\n");
//nms_set_color(0); return 0;
}
// Turn off terminal echo and line buffering
nms_set_terminal(0);
// Display characters // Needed for UTF-8 support
nms_exec(input); setlocale(LC_ALL, "");
// Don't forget to free the allocated memory! // Get terminal window rows/cols
free(input); maxRows = nms_term_rows();
maxCols = nms_term_cols();
return 0; // Seed my random number generator with the current time
srand(time(NULL));
// Get cursor position if we are not clearing the screen
if (!clearScr) {
origRow = nms_get_cursor_row();
// nms_get_cursor_row() may display output in some terminals. So
// we need to reposition the cursor to the start of the row.
CURSOR_MOVE(origRow, origCol);
}
// Assign current row/col positions
curRow = origRow;
curCol = origCol;
// Geting input
for (i = 0; string[i] != '\0'; ++i) {
// Don't go beyond maxRows
if (curRow - origRow >= maxRows - 1) {
break;
}
// Allocate memory for next list link
if (list_pointer == NULL) {
list_pointer = malloc(sizeof(struct charAttr));
list_head = list_pointer;
} else {
list_pointer->next = malloc(sizeof(struct charAttr));
list_pointer = list_pointer->next;
}
// Get character's byte-length and store character.
if (mblen(&string[i], 4) > 0) {
list_pointer->source = malloc(mblen(&string[i], 4) + 1);
strncpy(list_pointer->source, &string[i], mblen(&string[i], 4));
list_pointer->source[mblen(&string[i], 4)] = '\0';
i += (mblen(&string[i], 4) - 1);
} else {
fprintf(stderr, "Unknown character encountered. Quitting.\n");
nms_set_terminal(1);
return 0;
}
// Set flag if we have a whitespace character
if (strlen(list_pointer->source) == 1 && isspace(list_pointer->source[0]))
list_pointer->is_space = 1;
else
list_pointer->is_space = 0;
// Set initial mask chharacter
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
// Set reveal time
list_pointer->time = rand() % 5000;
// Set character column width
wchar_t widec[sizeof(list_pointer->source)] = {};
mbstowcs(widec, list_pointer->source, sizeof(list_pointer->source));
list_pointer->width = wcwidth(*widec);
// Set next node to null
list_pointer->next = NULL;
// Track row count
if (string[i] == '\n' || (curCol += list_pointer->width) > maxCols) {
curCol = 0;
curRow++;
if (curRow == maxRows + 1 && origRow > 0) {
origRow--;
curRow--;
}
}
}
// Save terminal state, clear screen, and home/hide the cursor
if (clearScr) {
CURSOR_SAVE();
SCREEN_SAVE();
CLEAR_SCR();
CURSOR_HOME();
CURSOR_HIDE();
}
// Print mask characters with 'type effect'
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// print mask character
printf("%s", list_pointer->mask);
if (list_pointer->width == 2) {
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
}
// flush output and sleep
fflush(stdout);
nms_sleep(TYPE_EFFECT_SPEED);
}
// Flush any input up to this point
nms_clear_input();
// If autoDecrypt flag is set, we sleep. Otherwise require user to
// press a key to continue.
if (autoDecrypt)
sleep(1);
else
nms_get_char();
// Jumble loop
for (i = 0; i < (JUMBLE_SECONDS * 1000) / JUMBLE_LOOP_SPEED; ++i) {
// Move cursor to home position
if (clearScr) {
CURSOR_HOME();
} else {
CURSOR_MOVE(origRow, origCol);
}
// Print new mask for all characters
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// print new mask character
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
if (list_pointer->width == 2) {
printf("%s", maskCharTable[rand() % MASK_CHAR_COUNT]);
}
}
// flush output and sleep
fflush(stdout);
nms_sleep(JUMBLE_LOOP_SPEED);
}
// Reveal loop
while (!revealed) {
// Move cursor to home position
if (clearScr) {
CURSOR_HOME();
} else {
CURSOR_MOVE(origRow, origCol);
}
// Set revealed flag
revealed = 1;
for (list_pointer = list_head; list_pointer != NULL; list_pointer = list_pointer->next) {
// Print mask character (or space)
if (list_pointer->is_space) {
printf("%s", list_pointer->source);
continue;
}
// If we still have time before the char is revealed, display the mask
if (list_pointer->time > 0) {
// Change the mask randomly
if (list_pointer->time < 500) {
if (rand() % 3 == 0) {
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
}
} else {
if (rand() % 10 == 0) {
list_pointer->mask = maskCharTable[rand() % MASK_CHAR_COUNT];
}
}
// Print mask
printf("%s", list_pointer->mask);
// Decrement reveal time
list_pointer->time -= REVEAL_LOOP_SPEED;
// Unset revealed flag
revealed = 0;
} else {
// Set bold and foreground color for character reveal
BOLD();
if (colorOn) {
FOREGROUND_COLOR(foregroundColor);
}
// print source character
printf("%s", list_pointer->source);
// Unset foreground color
CLEAR_ATTR();
}
}
// flush output and sleep
fflush(stdout);
nms_sleep(REVEAL_LOOP_SPEED);
}
// Flush any input up to this point
nms_clear_input();
// Check if user must select from a set of options
if (returnOpts != NULL && strlen(returnOpts) > 0) {
// Position cursor if necessary
if (inputPositionY >= 0 && inputPositionX >= 0) {
CURSOR_MOVE(inputPositionY, inputPositionX);
}
CURSOR_SHOW();
// Get and validate user selection
while (strchr(returnOpts, ret = nms_get_char()) == NULL) {
BEEP();
}
}
// User must press a key to continue when clearSrc is set
// without returnOpts
else if (clearScr) {
nms_get_char();
}
// Restore screen and cursor is clearSrc is set
if (clearScr) {
SCREEN_RESTORE();
CURSOR_SHOW();
CURSOR_RESTORE();
}
// Turn on terminal echo and line buffering
nms_set_terminal(1);
// Freeing the list.
list_pointer = list_head;
while (list_pointer != NULL) {
list_temp = list_pointer;
list_pointer = list_pointer->next;
free(list_temp->source);
free(list_temp);
}
return ret;
}
/*
* nms_set_foreground_color() sets the foreground color of the unencrypted
* characters as they are revealed to the color indicated by the 'color'
* argument. Valid arguments are "white", "yellow", "magenta", "blue",
* "green", "red", and "cyan". This function will default to blue if
* passed an invalid color. No value is returned.
*/
void nms_set_foreground_color(char *color) {
if(strcmp("white", color) == 0)
foregroundColor = COLOR_WHITE;
else if(strcmp("yellow", color) == 0)
foregroundColor = COLOR_YELLOW;
else if(strcmp("black", color) == 0)
foregroundColor = COLOR_BLACK;
else if(strcmp("magenta", color) == 0)
foregroundColor = COLOR_MAGENTA;
else if(strcmp("blue", color) == 0)
foregroundColor = COLOR_BLUE;
else if(strcmp("green", color) == 0)
foregroundColor = COLOR_GREEN;
else if(strcmp("red", color) == 0)
foregroundColor = COLOR_RED;
else if(strcmp("cyan", color) == 0)
foregroundColor = COLOR_CYAN;
else
foregroundColor = COLOR_BLUE;
}
/*
* nms_set_return_opts() takes a character sting and copies it to the
* returnOpts setting used by nms_exec().
*/
void nms_set_return_opts(char *opts) {
returnOpts = realloc(returnOpts, strlen(opts) + 1);
strcpy(returnOpts, opts);
}
/*
* nms_set_auto_decrypt() sets the autoDecrypt flag according to the
* true/false value of the 'setting' argument.
*/
void nms_set_auto_decrypt(int setting) {
if (setting)
autoDecrypt = 1;
else
autoDecrypt = 0;
}
/*
* nms_set_clear_scr() sets the clearScr flag according to the
* true/false value of the 'setting' argument.
*/
void nms_set_clear_scr(int setting) {
if (setting)
clearScr = 1;
else
clearScr = 0;
}
/*
* nms_set_color() sets the colorOn flag according to the
* true/false value of the 'setting' argument.
*/
void nms_use_color(int setting) {
if (setting)
colorOn = 1;
else
colorOn = 0;
}
/*
* nms_set_input_position() sets the desired coordinate of the cursor in
* the terminal when accepting user input after nms_exec() reveals the
* unencrypted characters.
*/
void nms_set_input_position(int x, int y) {
if (x >= 0 && y >= 0) {
inputPositionX = x;
inputPositionY = y;
}
}
/*
* nms_sleep() sleeps for the number of miliseconds indicated by 't'.
*/
static void nms_sleep(int t) {
struct timespec ts;
ts.tv_sec = t / 1000;
ts.tv_nsec = (t % 1000) * 1000000;
nanosleep(&ts, NULL);
}
/*
* nms_term_rows() gets and returns the number of rows in the current
* terminal window.
*/
static int nms_term_rows(void) {
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
return w.ws_row;
}
/*
* nms_term_cols() gets and returns the number of cols in the current
* terminal window.
*/
static int nms_term_cols(void) {
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
return w.ws_col;
}
/*
* nms_set_terminal() turns off terminal echo and line buffering when
* passed an integer value that evaluates to true. It restores the
* original terminal values when passed an integer value that evaluates
* to false.
*/
static void nms_set_terminal(int s) {
struct termios tp;
static struct termios save;
static int state = 1;
if (s == 0) {
if (tcgetattr(STDIN_FILENO, &tp) == -1) {
return;
}
save = tp;
tp.c_lflag &=(~ICANON & ~ECHO);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tp) == -1) {
return;
}
} else {
if (state == 0 && tcsetattr(STDIN_FILENO, TCSANOW, &save) == -1)
return;
}
state = s;
}
/*
* nms_clear_input() clears the input buffer of all characters up to
* the EOF character.
*/
static void nms_clear_input(void) {
int i;
ioctl(STDIN_FILENO, FIONREAD, &i);
while (i > 0) {
getchar();
--i;
}
}
/*
* nms_get_char() returns the next character in the input buffer. In the
* case of an EOF character, it blocks until the user presses a key.
*/
static char nms_get_char(void) {
struct timespec ts;
int t = 50;
char c;
ts.tv_sec = t / 1000;
ts.tv_nsec = (t % 1000) * 1000000;
while ((c = getchar()) == EOF) {
nanosleep(&ts, NULL);
}
return c;
}
/*
* nms_get_cursor_row() returns the row position of the cursor as reported
* by the terminal program via the ANSI escape code
*/
static int nms_get_cursor_row(void) {
int i, r = 0;
int row = 0;
char buf[10];
char *cmd = "\033[6n";
memset(buf, 0, sizeof(buf));
write(STDOUT_FILENO, cmd, sizeof(cmd));
r = read(STDIN_FILENO, buf, sizeof(buf));
for (i = 0; i < r; ++i) {
if (buf[i] == 27 || buf[i] == '[') {
continue;
}
if (buf[i] >= '0' && buf[i] <= '9') {
row = (row * 10) + (buf[i] - '0');
}
if (buf[i] == ';' || buf[i] == 'R' || buf[i] == 0) {
break;
}
}
return row;
} }

6
src/libnms.h → src/nms.h
View File

@ -1,12 +1,12 @@
/* /*
* Copyright (c) 2016 Brian Barto * Copyright (c) 2017 Brian Barto
* *
* This program is free software; you can redistribute it and/or modify it * This program is free software; you can redistribute it and/or modify it
* under the terms of the MIT License. See LICENSE for more details. * under the terms of the MIT License. See LICENSE for more details.
*/ */
#ifndef LIBNMS_H #ifndef NMS_H
#define LIBNMS_H 1 #define NMS_H 1
// Function prototypes // Function prototypes
char nms_exec(char *); char nms_exec(char *);

9
src/sneakers.c
View File

@ -1,8 +1,15 @@
/*
* Copyright (c) 2017 Brian Barto
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the MIT License. See LICENSE for more details.
*/
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include "libnms.h" #include "nms.h"
int main(void) { int main(void) {
int termCols, spaces = 0; int termCols, spaces = 0;