Launch Youtube from Primary/Clipboard Buffer

youtube.cpp

/*

    Compile with:
    gcc -O3 -Wall youtube.c -o youtube -lX11

*/

#include<X11/Xlib.h>
#include<unistd.h>
#include<stdio.h>


void fast_memcpy(char *str, const char *str2)
{

    int i = 0;

    while(str2[i] != '\0')
    {
        str[i] = str2[i];
        ++i;
    }

    str[i] = '\0';
}

inline size_t fast_strlen(char *str)
{
    int i = 0;
    while(str[i] != '\0')
    {
        // Buffer could be huge, so don't count more than we have to
        if (i > 43)
            return 0;

        ++i;
    }

    // Don't count returns
    if (str[i - 1] == '\n' || str[i - 1] == '\r')
        --i; 

    return i;
}

int fast_memcmp(char *str, const char *str2, int length)
{
    for(;--length > -1; )
        if(str[length] != str2[length])
            return 1;

    return 0;
}

unsigned int fast_memcmpcpy(char *str, const char *str2)
{

    /* Compare strings and only copy if they differ */

    int i = 0;

    // Compare
    while(str2[i] != '\0')
    {
        // A char doesn't match, so copy whole string to compare
        if (str[i] != str2[i])
        {
            fast_memcpy(str, str2);
            return 1;
        }

        ++i;
    }

    // If we made it here, there is a match, so no need to copy
    return 0;
}

// Function to capture clipboard buffers
char * PrintSelection(Display *display, Window  window, const char *bufname, const char *fmtname)
{
        char *result;
	unsigned long ressize, restail;
	int resbits;
	Atom bufid	= XInternAtom(display, bufname, False),
	fmtid		= XInternAtom(display, fmtname, False),
	propid 		= XInternAtom(display, "XSEL_DATA", False);
	XEvent event;

	XConvertSelection(display, bufid, fmtid, propid, window, CurrentTime);
	do
		XNextEvent(display, &event);
	while (event.type != SelectionNotify || event.xselection.selection != bufid);

	if (event.xselection.property)
	{
		XGetWindowProperty(display, window, propid, 0, 536870911, False, AnyPropertyType, &fmtid, &resbits, &ressize, &restail, (unsigned char**)&result);

                int resultLen = fast_strlen(result);

                if (resultLen < 27 || resultLen > 43)
                    return "";
 
                if (result[resultLen - 1] == '\n')
                    result[resultLen - 1] =  '\0';
                else if (result[resultLen] == '\n')
                         result[resultLen] =  '\0';

		return result;
	}
	
        return "";
}

int main() {

    // Buffer capture variables
    Display *display     = XOpenDisplay(NULL);
    unsigned short color = BlackPixel(display, DefaultScreen(display));
    Window window        = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0, 1, 1, 0, color, color);

    // STRING  or UTF8_STRING
    char clip[64];       // 0 =   CLIPBOARD, 1=PRIMARY

    fast_memcpy(clip, PrintSelection(display, window, "PRIMARY", "STRING"));

    puts("https://www.youtube.com/watch?v=WeOuKguaBec");
    puts("https://www.youtube.com/watch?v=pGe3u5rLGQc");
    puts("https://youtu.be/xWNnq6vQfGg");

    do{

        if(fast_memcmpcpy(clip, PrintSelection(display, window, "PRIMARY", "STRING")) && ((!fast_memcmp(clip, "https://youtu.be/", 17) && fast_strlen(clip) == 28) || (!fast_memcmp(clip, "https://www.youtube.com/watch?v=", 31) && fast_strlen(clip) == 43)))
        {

            int pid = fork();

            if (pid == 0)
                execl("/usr/bin/vlc", "vlc", "--play-and-exit", clip, (char *) NULL);

            printf("Playing \'%s\'...\n", clip);
        }

        sleep(1);

    }while(1);

    XDestroyWindow(display, window);
    XCloseDisplay(display);

    return 0;
}