lineedit: add support for M-b, M-f, M-d, M-Backspace

[oweals/busybox.git] / coreutils / catv.c

diff --git a/coreutils/catv.c b/coreutils/catv.c
index cc61233e18bd5ee69ede128bf8dc479731e569e4..214b4311a6e32efd1d6c67037a4d96a277305ea6 100644 (file)
--- a/coreutils/catv.c
+++ b/coreutils/catv.c
@@ -4,33 +4,46 @@
  *
  * Copyright (C) 2006 Rob Landley <rob@landley.net>
  *
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
 /* See "Cat -v considered harmful" at
  * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
 
+//usage:#define catv_trivial_usage
+//usage:       "[-etv] [FILE]..."
+//usage:#define catv_full_usage "\n\n"
+//usage:       "Display nonprinting characters as ^x or M-x\n"
+//usage:     "\n       -e      End each line with $"
+//usage:     "\n       -t      Show tabs as ^I"
+//usage:     "\n       -v      Don't use ^x or M-x escapes"
+
 #include "libbb.h"
 
-int catv_main(int argc, char **argv);
-int catv_main(int argc, char **argv)
+int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int catv_main(int argc UNUSED_PARAM, char **argv)
 {
-       int retval = EXIT_SUCCESS, fd;
+       int retval = EXIT_SUCCESS;
+       int fd;
        unsigned flags;
 
-       flags = getopt32(argc, argv, "etv");
+       flags = getopt32(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;
+
+       /* Read from stdin if there's nothing else to do. */
+       if (!argv[0])
+               *--argv = (char*)"-";
        do {
-               /* Read from stdin if there's nothing else to do. */
-               fd = 0;
-               if (*argv && 0 > (fd = xopen(*argv, O_RDONLY)))
+               fd = open_or_warn_stdin(*argv);
+               if (fd < 0) {
                        retval = EXIT_FAILURE;
-               else for (;;) {
+                       continue;
+               }
+               for (;;) {
                        int i, res;
 
 #define read_buf bb_common_bufsiz1
@@ -40,27 +53,26 @@ int catv_main(int argc, char **argv)
                        if (res < 1)
                                break;
                        for (i = 0; i < res; i++) {
-                               char c = read_buf[i];
+                               unsigned char c = read_buf[i];
 
                                if (c > 126 && (flags & CATV_OPT_v)) {
                                        if (c == 127) {
                                                printf("^?");
                                                continue;
-                                       } else {
-                                               printf("M-");
-                                               c -= 128;
                                        }
+                                       printf("M-");
+                                       c -= 128;
                                }
                                if (c < 32) {
                                        if (c == 10) {
                                                if (flags & CATV_OPT_e)
-                                                       putchar('$');
+                                                       bb_putchar('$');
                                        } else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
                                                printf("^%c", c+'@');
                                                continue;
                                        }
                                }
-                               putchar(c);
+                               bb_putchar(c);
                        }
                }
                if (ENABLE_FEATURE_CLEAN_UP && fd)