C/read file into char*

#define CHUNK_SIZE 128
int readFile(char *filename, char **data) {
  FILE *f;
 
  char *c; /* contents*/
  void *p;
 
  int l; /* length */
  int r; /* amount read */
  int s; /* memory size */
 
  if ((f = fopen(filename,"r")) == NULL) {
    perror("fopen()");
		return 1;
  }
 
  c = NULL;
  l = 0;
  s = 0;
  while (!feof(f)) {
    s += CHUNK_SIZE;
    if ((p = realloc(c, sizeof(char) * s)) == NULL) {
      perror("realloc()");
      goto die;
    }
    c = p;
    r = fread(&(c[l]), 1, s - l, f);
    if (!r) {
      if (feof(f)) break;
      /* else error */
      fprintf(stderr,"fread(): An error occured\n");
      goto die;
    } else if (r < 0) {
      perror("fread()");
      break;
    }
    l += r;
  }
 
  if ((p = realloc(c, sizeof(char) * (l + 1))) == NULL) {
    perror("realloc()");
  } else {
    c = p;
  }
 
  c[l] = '\0';
 
	fclose(f);
 
	*data = c;
	return 0;
die:
	fclose(f);
	if (c) free(c);
	return 2;
}