Small tweaks

Lots of new code imported.

src/lib9p/dirread.c

@@ -0,0 +1,40 @@
+#include <u.h>
+#include <libc.h>
+#include <auth.h>
+#include <fcall.h>
+#include <thread.h>
+#include <9p.h>
+
+void
+dirread9p(Req *r, Dirgen *gen, void *aux)
+{
+	int start;
+	uchar *p, *ep;
+	uint rv;
+	Dir d;
+
+	if(r->ifcall.offset == 0)
+		start = 0;
+	else
+		start = r->fid->dirindex;
+
+	p = (uchar*)r->ofcall.data;
+	ep = p+r->ifcall.count;
+
+	while(p < ep){
+		memset(&d, 0, sizeof d);
+		if((*gen)(start, &d, aux) < 0)
+			break;
+		rv = convD2M(&d, p, ep-p);
+		free(d.name);
+		free(d.muid);
+		free(d.uid);
+		free(d.gid);
+		if(rv <= BIT16SZ)
+			break;
+		p += rv;
+		start++;
+	}
+	r->fid->dirindex = start;
+	r->ofcall.count = p - (uchar*)r->ofcall.data;
+}