Thread: Parse PPM header with function

So I have a function that is used to copy over the header of a ppm file to another file and removes the comments. Is there a way to add onto this function so that I can pull out the width and height dimensions? The magic number is always P6 and the max color value is always 255.

Code:

void headerinfo(FILE * infile, FILE * outfile, int *wid, int *hei)
{

  char line[100];
  int c;

  fgets(line, 100, infile);
  c = strlen(line);
  while (!
         (4 <= c && line[c - 4] == '2' && line[c - 3] == '5'
          && line[c - 2] == '5' && line[c - 1] == '\n')) {
    if (line[0] == '#') {
      fgets(line, 100, infile);
      c = strlen(line);
    } else {
      fputs(line, outfile);
      fgets(line, 100, infile);
      c = strlen(line);
    }
  }
  fputs(line, outfile);
}

Why don't you read a bit on what the PPM format is?