blob: 1aeebe1d96807dc0b4c62ebd9ad6b32d88dc6edf
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * cat -v implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 2006 Rob Landley <rob@landley.net> |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 8 | */ |
| 9 | |
| 10 | /* See "Cat -v considered harmful" at |
| 11 | * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */ |
| 12 | |
| 13 | //config:config CATV |
| 14 | //config: bool "catv" |
| 15 | //config: default y |
| 16 | //config: help |
| 17 | //config: Display nonprinting characters as escape sequences (like some |
| 18 | //config: implementations' cat -v option). |
| 19 | |
| 20 | //applet:IF_CATV(APPLET(catv, BB_DIR_BIN, BB_SUID_DROP)) |
| 21 | |
| 22 | //kbuild:lib-$(CONFIG_CATV) += catv.o |
| 23 | |
| 24 | //usage:#define catv_trivial_usage |
| 25 | //usage: "[-etv] [FILE]..." |
| 26 | //usage:#define catv_full_usage "\n\n" |
| 27 | //usage: "Display nonprinting characters as ^x or M-x\n" |
| 28 | //usage: "\n -e End each line with $" |
| 29 | //usage: "\n -t Show tabs as ^I" |
| 30 | //usage: "\n -v Don't use ^x or M-x escapes" |
| 31 | |
| 32 | #include "libbb.h" |
| 33 | #include "common_bufsiz.h" |
| 34 | |
| 35 | #define CATV_OPT_e (1<<0) |
| 36 | #define CATV_OPT_t (1<<1) |
| 37 | #define CATV_OPT_v (1<<2) |
| 38 | struct BUG_const_mismatch { |
| 39 | char BUG_const_mismatch[ |
| 40 | CATV_OPT_e == VISIBLE_ENDLINE && CATV_OPT_t == VISIBLE_SHOW_TABS |
| 41 | ? 1 : -1 |
| 42 | ]; |
| 43 | }; |
| 44 | |
| 45 | int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 46 | int catv_main(int argc UNUSED_PARAM, char **argv) |
| 47 | { |
| 48 | int retval = EXIT_SUCCESS; |
| 49 | int fd; |
| 50 | unsigned opts; |
| 51 | opts = getopt32(argv, "etv"); |
| 52 | argv += optind; |
| 53 | #if 0 /* These consts match, we can just pass "opts" to visible() */ |
| 54 | if (opts & CATV_OPT_e) |
| 55 | flags |= VISIBLE_ENDLINE; |
| 56 | if (opts & CATV_OPT_t) |
| 57 | flags |= VISIBLE_SHOW_TABS; |
| 58 | #endif |
| 59 | |
| 60 | /* Read from stdin if there's nothing else to do. */ |
| 61 | if (!argv[0]) |
| 62 | *--argv = (char*)"-"; |
| 63 | |
| 64 | #define read_buf bb_common_bufsiz1 |
| 65 | setup_common_bufsiz(); |
| 66 | do { |
| 67 | fd = open_or_warn_stdin(*argv); |
| 68 | if (fd < 0) { |
| 69 | retval = EXIT_FAILURE; |
| 70 | continue; |
| 71 | } |
| 72 | for (;;) { |
| 73 | int i, res; |
| 74 | |
| 75 | res = read(fd, read_buf, COMMON_BUFSIZE); |
| 76 | if (res < 0) |
| 77 | retval = EXIT_FAILURE; |
| 78 | if (res <= 0) |
| 79 | break; |
| 80 | for (i = 0; i < res; i++) { |
| 81 | unsigned char c = read_buf[i]; |
| 82 | if (opts & CATV_OPT_v) { |
| 83 | putchar(c); |
| 84 | } else { |
| 85 | char buf[sizeof("M-^c")]; |
| 86 | visible(c, buf, opts); |
| 87 | fputs(buf, stdout); |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | if (ENABLE_FEATURE_CLEAN_UP && fd) |
| 92 | close(fd); |
| 93 | } while (*++argv); |
| 94 | |
| 95 | fflush_stdout_and_exit(retval); |
| 96 | } |
| 97 |