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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