my solution to lab5

lab/user/lsfd.c

@@ -0,0 +1,35 @@
+#include <inc/lib.h>
+
+void
+usage(void)
+{
+	cprintf("usage: lsfd [-1]\n");
+	exit();
+}
+
+void
+umain(int argc, char **argv)
+{
+	int i, usefprint = 0;
+	struct Stat st;
+	struct Argstate args;
+
+	argstart(&argc, argv, &args);
+	while ((i = argnext(&args)) >= 0)
+		if (i == '1')
+			usefprint = 1;
+		else
+			usage();
+
+	for (i = 0; i < 32; i++)
+		if (fstat(i, &st) >= 0) {
+			if (usefprint)
+				fprintf(1, "fd %d: name %s isdir %d size %d dev %s\n",
+					i, st.st_name, st.st_isdir,
+					st.st_size, st.st_dev->dev_name);
+			else
+				cprintf("fd %d: name %s isdir %d size %d dev %s\n",
+					i, st.st_name, st.st_isdir,
+					st.st_size, st.st_dev->dev_name);
+		}
+}