| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * cat -v implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2006 Rob Landley <rob@landley.net>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | /* See "Cat -v considered harmful" at
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| 11 | * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
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| 12 |
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| 13 | //usage:#define catv_trivial_usage
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| 14 | //usage: "[-etv] [FILE]..."
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| 15 | //usage:#define catv_full_usage "\n\n"
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| 16 | //usage: "Display nonprinting characters as ^x or M-x\n"
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| 17 | //usage: "\n -e End each line with $"
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| 18 | //usage: "\n -t Show tabs as ^I"
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| 19 | //usage: "\n -v Don't use ^x or M-x escapes"
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| 20 |
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| 21 | #include "libbb.h"
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| 22 |
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| 23 | int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 24 | int catv_main(int argc UNUSED_PARAM, char **argv)
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| 25 | {
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| 26 | int retval = EXIT_SUCCESS;
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| 27 | int fd;
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| 28 | unsigned flags;
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| 29 |
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| 30 | flags = getopt32(argv, "etv");
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| 31 | #define CATV_OPT_e (1<<0)
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| 32 | #define CATV_OPT_t (1<<1)
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| 33 | #define CATV_OPT_v (1<<2)
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| 34 | flags ^= CATV_OPT_v;
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| 35 | argv += optind;
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| 36 |
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| 37 | /* Read from stdin if there's nothing else to do. */
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| 38 | if (!argv[0])
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| 39 | *--argv = (char*)"-";
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| 40 | do {
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| 41 | fd = open_or_warn_stdin(*argv);
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| 42 | if (fd < 0) {
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| 43 | retval = EXIT_FAILURE;
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| 44 | continue;
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| 45 | }
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| 46 | for (;;) {
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| 47 | int i, res;
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| 48 |
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| 49 | #define read_buf bb_common_bufsiz1
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| 50 | res = read(fd, read_buf, COMMON_BUFSIZE);
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| 51 | if (res < 0)
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| 52 | retval = EXIT_FAILURE;
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| 53 | if (res < 1)
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| 54 | break;
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| 55 | for (i = 0; i < res; i++) {
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| 56 | unsigned char c = read_buf[i];
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| 57 |
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| 58 | if (c > 126 && (flags & CATV_OPT_v)) {
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| 59 | if (c == 127) {
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| 60 | printf("^?");
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| 61 | continue;
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| 62 | }
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| 63 | printf("M-");
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| 64 | c -= 128;
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| 65 | }
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| 66 | if (c < 32) {
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| 67 | if (c == 10) {
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| 68 | if (flags & CATV_OPT_e)
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| 69 | bb_putchar('$');
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| 70 | } else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
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| 71 | printf("^%c", c+'@');
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| 72 | continue;
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| 73 | }
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| 74 | }
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| 75 | bb_putchar(c);
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| 76 | }
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| 77 | }
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| 78 | if (ENABLE_FEATURE_CLEAN_UP && fd)
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| 79 | close(fd);
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| 80 | } while (*++argv);
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| 81 |
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| 82 | fflush_stdout_and_exit(retval);
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| 83 | }
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