first commit

str.c

@@ -0,0 +1,21 @@
+#include "dat.h"
+#include "fn.h"
+
+enum
+{
+	Maxrunes = nelem(((Str*)0)->r),
+};
+
+void
+sinit(Str *s, char *src, int n)
+{
+	int len;
+
+	s->n = 0;
+	while(n > 0 && s->n < Maxrunes){
+		len = chartorune(&s->r[s->n], src);
+		s->n++;
+		src += len;
+		n -= len;
+	}
+}