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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 tarball for details.
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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 | #include "libbb.h"
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14 |
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15 | int catv_main(int argc, char **argv);
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16 | int catv_main(int argc, char **argv)
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17 | {
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18 | int retval = EXIT_SUCCESS;
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19 | int fd;
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20 | unsigned flags;
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21 |
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22 | flags = getopt32(argv, "etv");
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23 | #define CATV_OPT_e (1<<0)
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24 | #define CATV_OPT_t (1<<1)
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25 | #define CATV_OPT_v (1<<2)
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26 | flags ^= CATV_OPT_v;
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27 | argv += optind;
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28 |
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29 | /* Read from stdin if there's nothing else to do. */
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30 | fd = 0;
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31 | if (!argv[0]) {
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32 | argv--;
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33 | goto jump_in;
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34 | }
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35 | do {
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36 | fd = open_or_warn(*argv, O_RDONLY);
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37 | if (fd < 0) {
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38 | retval = EXIT_FAILURE;
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39 | continue;
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40 | }
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41 | jump_in:
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42 | for (;;) {
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43 | int i, res;
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44 |
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45 | #define read_buf bb_common_bufsiz1
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46 | res = read(fd, read_buf, COMMON_BUFSIZE);
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47 | if (res < 0)
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48 | retval = EXIT_FAILURE;
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49 | if (res < 1)
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50 | break;
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51 | for (i = 0; i < res; i++) {
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52 | unsigned char c = read_buf[i];
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53 |
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54 | if (c > 126 && (flags & CATV_OPT_v)) {
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55 | if (c == 127) {
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56 | printf("^?");
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57 | continue;
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58 | }
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59 | printf("M-");
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60 | c -= 128;
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61 | }
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62 | if (c < 32) {
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63 | if (c == 10) {
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64 | if (flags & CATV_OPT_e)
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65 | putchar('$');
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66 | } else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
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67 | printf("^%c", c+'@');
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68 | continue;
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69 | }
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70 | }
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71 | putchar(c);
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72 | }
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73 | }
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74 | if (ENABLE_FEATURE_CLEAN_UP && fd)
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75 | close(fd);
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76 | } while (*++argv);
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77 |
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78 | fflush_stdout_and_exit(retval);
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79 | }
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