implement cp and mv and improve rm

mv.c

@@ -0,0 +1,39 @@
+/* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include "fs.h"
+#include "util.h"
+
+int mv(const char *, const char *);
+
+int
+main(int argc, char *argv[])
+{
+	struct stat st;
+	
+	if(getopt(argc, argv, "") != -1)
+		exit(EXIT_FAILURE);
+	if(argc > 3 && !(stat(argv[argc-1], &st) == 0 && S_ISDIR(st.st_mode)))
+		eprintf("%s: not a directory\n", argv[argc-1]);
+	enmasse(argc - optind, &argv[optind], mv);
+	return EXIT_SUCCESS;
+}
+
+int
+mv (const char *s1, const char *s2)
+{
+	if (rename(s1, s2) == 0)
+		return 0;
+	if (errno == EXDEV)
+	{
+		cp_rflag = true;
+		rm_rflag = true;
+		cp(s1, s2);
+		rm(s1);
+		return 0;
+	}
+	return -1;
+}