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mpfmt: handle base 2, 4

--- a/sys/src/libmp/port/mpfmt.c

+++ b/sys/src/libmp/port/mpfmt.c

@@ -44,21 +44,22 @@

 static char set16[] = "0123456789ABCDEF";

 static int

-to16(mpint *b, char *buf, int len)

+topow2(mpint *b, char *buf, int len, int s)

 {

 	mpdigit *p, x;

-	int i, j;

+	int i, j, sn;

 	char *out, *eout;

 	if(len < 1)

 		return -1;

+	sn = 1<<s;

 	out = buf;

 	eout = buf+len;

 	for(p = &b->p[b->top-1]; p >= b->p; p--){

 		x = *p;

-		for(i = Dbits-4; i >= 0; i -= 4){

-			j = 0xf & (x>>i);

+		for(i = Dbits-s; i >= 0; i -= s){

+			j = x >> i & sn - 1;

 			if(j != 0 || out != buf){

 				if(out >= eout)

 					return -1;

@@ -190,10 +191,16 @@

 		break;

 	default:

 	case 16:

-		rv = to16(b, out, len);

+		rv = topow2(b, out, len, 4);

 		break;

 	case 10:

 		rv = to10(b, out, len);

+		break;

+	case 4:

+		rv = topow2(b, out, len, 2);

+		break;

+	case 2:

+		rv = topow2(b, out, len, 1);

 		break;

 	}

 	if(rv < 0){

-- 

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