a

gui-win32/wstrtoutf.c

@@ -0,0 +1,35 @@
+#include <u.h>
+#include <libc.h>
+
+int
+wstrutflen(Rune *s)
+{
+	int n;
+	
+	for(n=0; *s; n+=runelen(*s),s++)
+		;
+	return n;
+}
+
+int
+wstrtoutf(char *s, Rune *t, int n)
+{
+	int i;
+	char *s0;
+
+	s0 = s;
+	if(n <= 0)
+		return wstrutflen(t)+1;
+	while(*t) {
+		if(n < UTFmax+1 && n < runelen(*t)+1) {
+			*s = 0;
+			return i+wstrutflen(t)+1;
+		}
+		i = runetochar(s, t);
+		s += i;
+		n -= i;
+		t++;
+	}
+	*s = 0;
+	return s-s0;
+}