Add catv (separate applet instead of cat -v). Also cleanup cat.c comments,

the following of which (from cat.c) belongs in svn history instead of the
source code:

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * This is a new implementation of 'cat' which aims to be SUSv3 compliant.
 *
 * Changes from the previous implementation include:
 * 1) Multiple '-' args are accepted as required by SUSv3.  The previous
 *    implementation would close stdin and segfault on a subsequent '-'.
 * 2) The '-u' options is required by SUSv3.  Note that the specified
 *    behavior for '-u' is done by default, so all we need do is accept
 *    the option.
 */

coreutils/Config.in

@@ -25,6 +25,12 @@ config CONFIG_CAT
 	help
 	  cat is used to concatenate files and print them to the standard
 	  output.  Enable this option if you wish to enable the 'cat' utility.
+config CONFIG_CATV
+	bool "catv"
+	default n
+	help
+	  Display nonprinting characters as escape sequences (like some
+	  implementations' cat -v option).
 
 config CONFIG_FEATURE_CAT_ESCAPE
 	bool "support -vetET"

coreutils/Makefile.in

@@ -14,6 +14,7 @@ COREUTILS-y:=
 COREUTILS-$(CONFIG_BASENAME)  += basename.o
 COREUTILS-$(CONFIG_CAL)       += cal.o
 COREUTILS-$(CONFIG_CAT)       += cat.o
+COREUTILS-$(CONFIG_CATV)      += catv.o
 COREUTILS-$(CONFIG_CHGRP)     += chgrp.o
 COREUTILS-$(CONFIG_CHMOD)     += chmod.o
 COREUTILS-$(CONFIG_CHOWN)     += chown.o

coreutils/cat.c

@@ -4,41 +4,14 @@
  *
  * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
  *
- * This program is free software; you can redistribute it and/or modify
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
  */
 
 /* BB_AUDIT SUSv3 compliant */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/cat.html */
 
-/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
- *
- * This is a new implementation of 'cat' which aims to be SUSv3 compliant.
- *
- * Changes from the previous implementation include:
- * 1) Multiple '-' args are accepted as required by SUSv3.  The previous
- *    implementation would close stdin and segfault on a subsequent '-'.
- * 2) The '-u' options is required by SUSv3.  Note that the specified
- *    behavior for '-u' is done by default, so all we need do is accept
- *    the option.
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
 #include "busybox.h"
+#include <unistd.h>
 
 int cat_main(int argc, char **argv)
 {

coreutils/catv.c

@@ -0,0 +1,65 @@
+/* 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"
+#include <unistd.h>
+#include <fcntl.h>
+
+int catv_main(int argc, char **argv)
+{
+	int retval = EXIT_SUCCESS, fd, flags;
+
+	flags = bb_getopt_ulflags(argc, argv, "etv");
+	flags ^= 4;
+
+	// Loop through files.
+
+	argv += optind;
+	do {
+		// Read from stdin if there's nothing else to do.
+
+		fd = 0;
+		if (*argv && 0>(fd = bb_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 & 4)) {
+					if (c == 127) {
+						printf("^?");
+						continue;
+					} else {
+						printf("M-");
+						c -= 128;
+					}
+				}
+				if (c < 32) {
+					if (c == 10) {
+					   if (flags & 1) putchar('$');
+					} else if (flags & (c==9 ? 2 : 4)) {
+						printf("^%c", c+'@');
+						continue;
+					}
+				}
+				putchar(c);
+			}
+		}
+		if (ENABLE_FEATURE_CLEAN_UP && fd) close(fd);
+	} while (*++argv);
+
+	return retval;
+}

include/applets.h

@@ -63,6 +63,7 @@ APPLET_NOUSAGE(busybox, busybox, _BB_DIR_BIN, _BB_SUID_MAYBE)
 USE_BUNZIP2(APPLET(bzcat, bunzip2, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CAL(APPLET(cal, cal, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CAT(APPLET(cat, cat, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_CATV(APPLET(catv, catv, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHATTR(APPLET(chattr, chattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHGRP(APPLET(chgrp, chgrp, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_CHMOD(APPLET(chmod, chmod, _BB_DIR_BIN, _BB_SUID_NEVER))

include/usage.h

@@ -136,6 +136,13 @@
 	"$ cat /proc/uptime\n" \
 	"110716.72 17.67"
 
+#define catv_trivial_usage \
+	"[-etv] [FILE]..."
+#define catv_full_usage \
+	"Display nonprinting characters as ^x or M-x.\n\n"\
+	"\t-e\tEnd each line with $\n" \
+	"\t-t\tShow tabs as ^I\n" \
+	"\t-v\tDon't use ^x or M-x escapes."
 #define chattr_trivial_usage \
 	"[-R] [-+=AacDdijsStTu] [-v version] files..."
 #define chattr_full_usage \