colorspec.c

unsigned short colorspec_read_byte(char* cs){
	char* hexmap="0123456789abcdef";
	unsigned short rv=0;
	int i;
	if(*cs!=0&&cs[1]!=0){
		for(i=0;hexmap[i]!=0&&hexmap[i]!=cs[0];i++){
		}
		rv|=(i<<12);
		for(i=0;hexmap[i]!=0&&hexmap[i]!=cs[1];i++){
		}
		rv|=(i<<8);
	}
	return rv;
}

XftColor colorspec_parse(char* cs, Display* display, int screen){
	XftColor rv;
	XRenderColor xrender_color={0,0,0,0xffff};
	int i;

	if(*cs=='#'){
		if(strlen(cs)!=7){
			fprintf(stderr, "Invalid colorspec length\n");
		}

		for(i=1;i<strlen(cs);i++){
			if(!isxdigit(cs[i])){
				fprintf(stderr, "Invalid digit in colorspec: %c\n", cs[i]);
				return rv;
			}
		}

		xrender_color.red=colorspec_read_byte(cs+1);
		xrender_color.green=colorspec_read_byte(cs+3);
		xrender_color.blue=colorspec_read_byte(cs+5);

		fprintf(stderr, "Read colorspec %s as r:%04x g:%04x b:%04x\n", cs, xrender_color.red, xrender_color.green, xrender_color.blue);

		if(!XftColorAllocValue(display, DefaultVisual(display, screen), DefaultColormap(display, screen), &xrender_color, &rv)){
			fprintf(stderr, "Failed to allocate color\n");
		}
	}
	else{
		if(!XftColorAllocName(display, DefaultVisual(display, screen), DefaultColormap(display, screen), cs, &rv)){
			fprintf(stderr, "Failed to get color by name\n");
		}
	}
	return rv;
}