1 files changed, 69 insertions, 0 deletions
diff --git a/coreutils/catv.c b/coreutils/catv.c
new file mode 100644
index 000000000..66f30693a
--- /dev/null
+++ b/coreutils/catv.c
@@ -0,0 +1,69 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * cat -v implementation for busybox
+ *
+ * Copyright (C) 2006 Rob Landley <rob@landley.net>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* See "Cat -v considered harmful" at
+ * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
+
+#include "busybox.h"
+
+int catv_main(int argc, char **argv)
+{
+	int retval = EXIT_SUCCESS, fd;
+	unsigned flags;
+
+	flags = getopt32(argc, argv, "etv");
+#define CATV_OPT_e (1<<0)
+#define CATV_OPT_t (1<<1)
+#define CATV_OPT_v (1<<2)
+	flags ^= CATV_OPT_v;
+
+	argv += optind;
+	do {
+		/* Read from stdin if there's nothing else to do. */
+		fd = 0;
+		if (*argv && 0 > (fd = xopen(*argv, O_RDONLY)))
+			retval = EXIT_FAILURE;
+		else for (;;) {
+			int i, res;
+
+			res = read(fd, bb_common_bufsiz1, sizeof(bb_common_bufsiz1));
+			if (res < 0)
+				retval = EXIT_FAILURE;
+			if (res < 1)
+				break;
+			for (i = 0; i < res; i++) {
+				char c = bb_common_bufsiz1[i];
+
+				if (c > 126 && (flags & CATV_OPT_v)) {
+					if (c == 127) {
+						printf("^?");
+						continue;
+					} else {
+						printf("M-");
+						c -= 128;
+					}
+				}
+				if (c < 32) {
+					if (c == 10) {
+						if (flags & CATV_OPT_e)
+							putchar('$');
+					} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
+						printf("^%c", c+'@');
+						continue;
+					}
+				}
+				putchar(c);
+			}
+		}
+		if (ENABLE_FEATURE_CLEAN_UP && fd)
+			close(fd);
+	} while (*++argv);
+
+	fflush_stdout_and_exit(retval);
+}