| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * uniq implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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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 | /* BB_AUDIT SUSv3 compliant */
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| 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 16 | int uniq_main(int argc UNUSED_PARAM, char **argv)
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| 17 | {
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| 18 | const char *input_filename;
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| 19 | unsigned skip_fields, skip_chars, max_chars;
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| 20 | unsigned opt;
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| 21 | char *cur_line;
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| 22 | const char *cur_compare;
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| 23 |
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| 24 | enum {
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| 25 | OPT_c = 0x1,
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| 26 | OPT_d = 0x2, /* print only dups */
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| 27 | OPT_u = 0x4, /* print only uniq */
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| 28 | OPT_f = 0x8,
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| 29 | OPT_s = 0x10,
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| 30 | OPT_w = 0x20,
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| 31 | };
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| 32 |
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| 33 | skip_fields = skip_chars = 0;
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| 34 | max_chars = INT_MAX;
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| 35 |
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| 36 | opt_complementary = "f+:s+:w+";
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| 37 | opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars);
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| 38 | argv += optind;
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| 39 |
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| 40 | input_filename = argv[0];
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| 41 | if (input_filename) {
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| 42 | const char *output;
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| 43 |
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| 44 | if (input_filename[0] != '-' || input_filename[1]) {
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| 45 | close(STDIN_FILENO); /* == 0 */
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| 46 | xopen(input_filename, O_RDONLY); /* fd will be 0 */
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| 47 | }
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| 48 | output = argv[1];
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| 49 | if (output) {
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| 50 | if (argv[2])
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| 51 | bb_show_usage();
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| 52 | if (output[0] != '-' || output[1]) {
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| 53 | // Won't work with "uniq - FILE" and closed stdin:
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| 54 | //close(STDOUT_FILENO);
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| 55 | //xopen(output, O_WRONLY | O_CREAT | O_TRUNC);
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| 56 | xmove_fd(xopen(output, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
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| 57 | }
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | cur_compare = cur_line = NULL; /* prime the pump */
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| 62 |
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| 63 | do {
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| 64 | unsigned i;
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| 65 | unsigned long dups;
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| 66 | char *old_line;
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| 67 | const char *old_compare;
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| 68 |
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| 69 | old_line = cur_line;
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| 70 | old_compare = cur_compare;
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| 71 | dups = 0;
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| 72 |
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| 73 | /* gnu uniq ignores newlines */
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| 74 | while ((cur_line = xmalloc_fgetline(stdin)) != NULL) {
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| 75 | cur_compare = cur_line;
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| 76 | for (i = skip_fields; i; i--) {
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| 77 | cur_compare = skip_whitespace(cur_compare);
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| 78 | cur_compare = skip_non_whitespace(cur_compare);
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| 79 | }
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| 80 | for (i = skip_chars; *cur_compare && i; i--) {
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| 81 | ++cur_compare;
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| 82 | }
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| 83 |
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| 84 | if (!old_line || strncmp(old_compare, cur_compare, max_chars)) {
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| 85 | break;
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| 86 | }
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| 87 |
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| 88 | free(cur_line);
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| 89 | ++dups; /* testing for overflow seems excessive */
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| 90 | }
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| 91 |
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| 92 | if (old_line) {
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| 93 | if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */
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| 94 | if (opt & OPT_c) {
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| 95 | /* %7lu matches GNU coreutils 6.9 */
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| 96 | printf("%7lu ", dups + 1);
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| 97 | }
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| 98 | printf("%s\n", old_line);
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| 99 | }
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| 100 | free(old_line);
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| 101 | }
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| 102 | } while (cur_line);
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| 103 |
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| 104 | die_if_ferror(stdin, input_filename);
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| 105 |
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| 106 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 107 | }
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