#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>

/**
 * Here is a scrolly text in C in a command line console for Windows
 * Tested using Code::Blocks and Windows 7 Professional SP1
 *
 * @Author:	Shaun B
 * @Version:	1.0.0.1 - 2012-09-04
 * @Todo:	Find out how to print to the entire bottom line of the console
 * 		without forcing a line-feed.
 *
 **/

int main();
void gotoxy(int, int);
void hideCursor();
void scroll();
void exchangeToDisplay();

// Sets variables for:
//  Scrolly message -
static char scrolly [] = "....................This is a scrolly text....................Nah nah nah nah nahhhh....................Like a BAWS....................#";
//  Display string -
static char display [78];
//  Keyboard input -
static char character [1];
//  Running boolean -
static char run = 1;
//  Reusable index counters -
static unsigned char i = 0;
static unsigned char c = 0;
//  Sleep time -
static signed int sleep = 100;
//  Char buffer for scroll function -
static char buffer [1];

int main()
{
    // Sets default console size, colours and title:
    system("mode CON: COLS=80 LINES=50");
    system("color 03");
    system("cls");
    system("title Scrolly started at %TIME% on %DATE%");
    system("echo off");
    // Switches off blinking cursor:
    SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_LINE_INPUT);
    hideCursor();
    // Sets up display string:
    exchangeToDisplay();
    // Main loop:
    while(run)
    {
        // Sets cursor position for each scrolly text:
        gotoxy(1,0);
        printf("%s",display);
        gotoxy(1,49);
        printf("%s",display);
        // Checks if keyboard has been pressed:
        if (_kbhit())
        {
            character[0]=_getch();
        }
        // Checks for space...
        if(character[0]==32)
        {
            // If so, stops main loop:
            run=0;
        }
        // Checks for left arrow and arrow down...
        if((character[0]==75 || character[0]==80) && sleep<255)
        {
            // Increases sleep call (higher is slower):
            sleep+=10;
        }
        // Checks for other arrow keys...
        if((character[0]==72 || character[0]==77) && sleep>0)
        {
            // Decreases sleep call:
            sleep-=10;
        }
        // Clears character buffer if set:
        if(character[0])
        {
            character[0]=0;
        }
        // Checks if time exceeds longest sleep time:
        if(sleep>254)
        {
            sleep=255;
        }
        // Checks if time exceeds shortest sleep time:
        if(sleep<1)
        {
            sleep=0;
        }
        // Calls scroll function:
        scroll();
        // Calls sleep function:
        Sleep(sleep+1);
    }
    // Returns when loop is exited:
    return 0;
}

// Sets co-ordinates within the command line:
void gotoxy(int x, int y)
{
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

// Turns off blinking cursor:
void hideCursor()
{
    CONSOLE_CURSOR_INFO lpCursor;
    lpCursor.bVisible = 0;
    lpCursor.dwSize = 20;
    SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE),&lpCursor);
}

void scroll()
{
	// Sets counter to zero:
	c=0;
	// The buffer will preserve the first char otherwise the
	// scrolling won't wrap around:
	buffer[0]=scrolly[c];
	// Loop will happen whilst the terminator hasn't been reached:
	while(scrolly[c]!='#')
	{
		// Moves each character one element to the left:
		scrolly[c]=scrolly[c+1];
		// Increase our counter
		c++;
	}
	// Puts the old first character from the start to the end so
	// it wraps around:
	scrolly[c-1]=buffer[0];
	// Checks to see if the terminator has been over-written, if not
	// then it's restored:
	if(scrolly[c]!='#')
	{
		scrolly[c]='#';
	}
	exchangeToDisplay();
}

void exchangeToDisplay()
{
    // Writes the first 78 characters of our [shuffled] scrolly text
    // to our display string:
    for(c=0;c<78;c++)
    {
        display[c] = scrolly[c];
    }
}