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gui-win32: add support for surrogate pairs in rune16 functions

this was required to encode and decode characthers between U+10000-U+10FFFF
properly.

--- a/gui-win32/r16.c

+++ b/gui-win32/r16.c

@@ -21,8 +21,9 @@

 	Maskx	= (1<<Bitx)-1,		/* 0011 1111 */

 	Testx	= Maskx ^ 0xFF,		/* 1100 0000 */

-	SurrogateMin	= 0xD800,

 	SurrogateMax	= 0xDFFF,

+	HiSurrogate		= 0xD800,

+	LoSurrogate		= 0xDC00,

 	Bad	= Runeerror,

 };

@@ -34,8 +35,8 @@

 	Rune16 *s;

 	n = runes16len(r) + 1;

-	s = malloc(n * sizeof(Rune16));

-	memmove(s, r, n * sizeof(Rune16));

+	s = calloc(n, sizeof(Rune16));

+	memcpy(s, r, n * sizeof(Rune16));

 	return s;

 }

@@ -59,17 +60,29 @@

 	op = p;

 	ep = p + nc;

-	while(c = *r++) {

+	while(c = *r++){

 		n = 1;

 		if(c >= Runeself)

 			n = runelen(c);

 		if(p + n >= ep)

 			break;

-		rc = c;

-		if(c < Runeself)

+		if(c < Runeself){

 			*p++ = c;

-		else

-			p += runetochar(p, &rc);

+			continue;

+		}

+		rc = c;

+		if(c >= LoSurrogate && c <= SurrogateMax)

+			rc = Bad;

+		else if(c >= HiSurrogate && c <= 0xDBFF){ /* decode a surrogate pair properly */

+			if(p + n+1 >= ep)

+				rc = Bad;

+			else if((c = *r) >= LoSurrogate && c <= SurrogateMax){

+				rc = 0x10000 | (*(r-1) - HiSurrogate) << 10 | (c - LoSurrogate);

+				r++;

+			}else

+				rc = Bad;

+		}

+		p += runetochar(p, &rc);

 	}

 	*p = '\0';

 	return op;

@@ -107,7 +120,12 @@

 	er = r + nc;

 	while(*p != '\0' && r + 1 < er){

 		p += chartorune(&rc, p);

-		*r++ = rc;	/* we'll ignore surrogate pairs */

+		if(rc >= 0x10000){ /* got to encode it in a surrogate pair */

+			rc -= 0x10000;

+			*r++ = (rc >> 10)+HiSurrogate;

+			*r++ = (rc & 0x3FF)+LoSurrogate;

+		}else

+			*r++ = rc;

 	}

 	*r = '\0';

 	return or;

@@ -138,7 +156,7 @@

 	wchar_t *ws;

 	n = utflen(s) + 1;

-	ws = malloc(n*sizeof(wchar_t));

+	ws = calloc(n, sizeof(wchar_t));

 	utftorunes16(ws, s, n);

 	return ws;

 }

@@ -162,7 +180,7 @@

 {

 	int n = 0;

-	while (*ws)

+	while(*ws)

 		n += runelen(*ws++);

 	return n+1;

 }