| 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 | #include "common_bufsiz.h"
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| 23 |
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| 24 | #define CATV_OPT_e (1<<0)
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| 25 | #define CATV_OPT_t (1<<1)
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| 26 | #define CATV_OPT_v (1<<2)
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| 27 | struct BUG_const_mismatch {
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| 28 | char BUG_const_mismatch[
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| 29 | CATV_OPT_e == VISIBLE_ENDLINE && CATV_OPT_t == VISIBLE_SHOW_TABS
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| 30 | ? 1 : -1
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| 31 | ];
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| 32 | };
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| 33 |
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| 34 | int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 35 | int catv_main(int argc UNUSED_PARAM, char **argv)
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| 36 | {
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| 37 | int retval = EXIT_SUCCESS;
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| 38 | int fd;
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| 39 | unsigned opts;
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| 40 | opts = getopt32(argv, "etv");
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| 41 | argv += optind;
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| 42 | #if 0 /* These consts match, we can just pass "opts" to visible() */
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| 43 | if (opts & CATV_OPT_e)
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| 44 | flags |= VISIBLE_ENDLINE;
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| 45 | if (opts & CATV_OPT_t)
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| 46 | flags |= VISIBLE_SHOW_TABS;
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| 47 | #endif
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| 48 |
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| 49 | /* Read from stdin if there's nothing else to do. */
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| 50 | if (!argv[0])
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| 51 | *--argv = (char*)"-";
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| 52 |
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| 53 | #define read_buf bb_common_bufsiz1
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| 54 | setup_common_bufsiz();
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| 55 | do {
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| 56 | fd = open_or_warn_stdin(*argv);
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| 57 | if (fd < 0) {
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| 58 | retval = EXIT_FAILURE;
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| 59 | continue;
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| 60 | }
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| 61 | for (;;) {
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| 62 | int i, res;
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| 63 |
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| 64 | res = read(fd, read_buf, COMMON_BUFSIZE);
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| 65 | if (res < 0)
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| 66 | retval = EXIT_FAILURE;
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| 67 | if (res <= 0)
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| 68 | break;
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| 69 | for (i = 0; i < res; i++) {
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| 70 | unsigned char c = read_buf[i];
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| 71 | if (opts & CATV_OPT_v) {
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| 72 | putchar(c);
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| 73 | } else {
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| 74 | char buf[sizeof("M-^c")];
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| 75 | visible(c, buf, opts);
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| 76 | fputs(buf, stdout);
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| 77 | }
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| 78 | }
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| 79 | }
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| 80 | if (ENABLE_FEATURE_CLEAN_UP && fd)
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| 81 | close(fd);
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| 82 | } while (*++argv);
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| 83 |
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| 84 | fflush_stdout_and_exit(retval);
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| 85 | }
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