#include <stdio.h>

#define X11CFG  "/etc/X11/XF86Config"
#define X11CFG1 "/tmp/XF86Config"
#define X11CFG2 "/tmp/XF86Config.new"

FILE *x11cfg;
FILE *x11cfg1;
FILE *x11cfg2;
FILE *curfile;
char line[80];
char status;
const char str1[] = "Section \"Device\"\n";
const char str2[] = "Section \"Monitor\"\n";
char *curstr;

int main() {
	truncate (X11CFG, 0);
	x11cfg  = fopen (X11CFG,  "a");
	x11cfg1 = fopen (X11CFG1, "r");
	x11cfg2 = fopen (X11CFG2, "r");
	curfile = x11cfg1;
	while (fgets (line, 80, curfile) != NULL ) {
		if (!strcmp (line, str1)) curstr = str1;
		else if (!strcmp (line, str2)) curstr = str2;
		else if (!strcmp (line, "EndSection\n") && status) {
			status = 0;
			curfile = x11cfg1;
			fputs (line, x11cfg);
			while ( fgets (line, 80, curfile) && \
				strcmp (line, "EndSection\n"));
			continue;
		}
		else {
			fputs (line, x11cfg);
			continue;
		}
		status = 1;
		curfile = x11cfg2;
		while (fgets (line, 80, curfile) && strcmp (line, curstr));
		fputs (line, x11cfg);
	}
	fclose (x11cfg);
	fclose (x11cfg1);
	fclose (x11cfg2);
	exit (0);
}