Advent of Code Day 3 Part 1

// This program is a filter.
// Input file should be fed
// into standard input.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int fabric[1000][1000];

int main( int argc, char **argv ){
    int c;
    int x, y, w, h;
    char buf[40];
    while( (c = fgetc( stdin )) != EOF ){
        fgets( buf, 40, stdin );
        strtok( buf, " " );
        strtok( NULL, " " );
        x = atoi( strtok( NULL, "," ) );
        y = atoi( strtok( NULL, ": " ) );
        w = atoi( strtok( NULL, "x" ) );
        h = atoi( strtok( NULL, "\n" ) );
        for( int i = x; i < x + w; i++ ){
            for( int j = y; j < y + h; j++ ){
                fabric[i][j]++;
            }
        }
    }
    int overlap = 0;
    for( int i = 0; i < 1000; i++ ){
        for( int j = 0; j < 1000; j++ ){
            if( fabric[i][j] >= 2 ) overlap++;
        }
    }
    printf( "%d\n", overlap );
    return 0;
}