a

libc/utfecpy.c

@@ -0,0 +1,21 @@
+#include <u.h>
+#include <libc.h>
+
+char*
+utfecpy(char *to, char *e, char *from)
+{
+	char *end;
+
+	if(to >= e)
+		return to;
+	end = memccpy(to, from, '\0', e - to);
+	if(end == nil){
+		end = e-1;
+		while(end>to && (*--end&0xC0)==0x80)
+			;
+		*end = '\0';
+	}else{
+		end--;
+	}
+	return end;
+}