flip: Rewrite in C

2 files changed, 31 insertions, 3 deletions

diff --git a/etc/flip b/etc/flip
deleted file mode 100755
index 614bc67..0000000
--- a/etc/flip
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/perl
-
-exec (shift @ARGV, pop @ARGV, @ARGV);
diff --git a/etc/flip.c b/etc/flip.c
new file mode 100644
index 0000000..dcd6bc0
--- /dev/null
+++ b/etc/flip.c
@@ -0,0 +1,31 @@
+/*
+ *  flip -- put last argument after first argument
+ *  $ cc -O2 -o flip flip.c
+ */
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main(int argc, char *argv[])
+{
+	int i;
+
+	if(argc-1 == 0){
+		fprintf(stderr, "usage: %s command [arg ...]\n", argv[0]);
+		return 1;
+	}
+
+	/* Move last argument after first argument. */
+	if(argc-1 > 2){
+		for(i = argc; i >= 3; i--)
+			argv[i] = argv[i-1];
+		argv[2] = strdup(argv[argc]);
+		argv[argc] = NULL;
+	}
+
+	execvp(argv[1], argv+1);
+}