// Convert to UTF-8
#include "push.h"
typedef struct{ns * b; int p; ns * down; int val; pull * * c;} bl;
void uniToUtf8(ele, ds *);

static void fin(ns * bp){bl * b = (bl *)bp;
     int n = -- b -> p;
     if(n == 1) {cont = (b -> c);
        b -> b = (ns *)uniToUtf8;
        on (b -> down, 128 | (63 & b -> val));}
     else on(b -> down, 128 | (63 & (b -> val >> (6*(n-1)))));}

void uniToUtf8(ele e, ds * bp){bl * b = (bl *)bp;
   if(e < (1<<7)) on(b -> down, e);
        else {int n = e < (1<<21)?(e < (1<<16)?(e < (1<<11)?2:3):4)
            :(e < (1<<26)? 5:(e < (1<<31)?6: errorx(1)));
       b -> b = (ns *)fin;
       b -> val = e; b -> c = cont; b -> p = n; cont = (pull * *)bp;
       on (b -> down, ~(255 >> n) | (e >> (6*n))); 
     }}
 
// http://en.wikipedia.org/wiki/UTF-8