Fossil

*/
void wdiff_page(void){
  char *zTitle;
  int rid1, rid2;
  const char *zPageName;
  Manifest *pW1, *pW2 = 0;
  Blob w1, w2, d;
  int diffFlags;

  login_check_credentials();
  rid1 = atoi(PD("a","0"));
  if( !g.perm.History ){ login_needed(); return; }
  if( rid1==0 ) fossil_redirect_home();
  rid2 = atoi(PD("b","0"));
  zPageName = PD("name","");

  if( pW1==0 ) fossil_redirect_home();
  blob_init(&w1, pW1->zWiki, -1);
  blob_zero(&w2);
  if( rid2 && (pW2 = manifest_get(rid2, CFTYPE_WIKI))!=0 ){
    blob_init(&w2, pW2->zWiki, -1);
  }
  blob_zero(&d);
  diffFlags = construct_diff_flags(1,0);
  text_diff(&w2, &w1, &d, 5 | DIFF_IGNORE_EOLWS);
  @ <pre>
  @ %h(blob_str(&d))
  @ </pre>
  text_diff(&w2, &w1, &d, diffFlags | DIFF_HTML | DIFF_LINENO);
  @ <div class="udiff">
  @ %s(blob_str(&d))
  @ </div>
  manifest_destroy(pW1);
  manifest_destroy(pW2);
  style_footer();
}

/*
** prepare()s pStmt with a query requesting: