| 1 | /* uniq -- remove duplicate lines from a sorted file
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| 2 | Copyright (C) 86, 91, 1995-2005 Free Software Foundation, Inc.
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| 3 |
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| 4 | This program is free software; you can redistribute it and/or modify
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| 5 | it under the terms of the GNU General Public License as published by
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| 6 | the Free Software Foundation; either version 2, or (at your option)
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| 7 | any later version.
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| 8 |
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| 9 | This program is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License
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| 15 | along with this program; if not, write to the Free Software Foundation,
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| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 17 |
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| 18 | /* Written by Richard Stallman and David MacKenzie. */
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| 19 | |
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| 20 |
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| 21 | #include <config.h>
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| 22 |
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| 23 | #include <stdio.h>
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| 24 | #include <getopt.h>
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| 25 | #include <sys/types.h>
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| 26 |
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| 27 | #include "system.h"
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| 28 | #include "argmatch.h"
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| 29 | #include "linebuffer.h"
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| 30 | #include "error.h"
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| 31 | #include "hard-locale.h"
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| 32 | #include "posixver.h"
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| 33 | #include "quote.h"
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| 34 | #include "xmemcoll.h"
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| 35 | #include "xstrtol.h"
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| 36 | #include "memcasecmp.h"
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| 37 |
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| 38 | /* The official name of this program (e.g., no `g' prefix). */
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| 39 | #define PROGRAM_NAME "uniq"
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| 40 |
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| 41 | #define AUTHORS "Richard Stallman", "David MacKenzie"
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| 42 |
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| 43 | #define SWAP_LINES(A, B) \
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| 44 | do \
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| 45 | { \
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| 46 | struct linebuffer *_tmp; \
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| 47 | _tmp = (A); \
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| 48 | (A) = (B); \
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| 49 | (B) = _tmp; \
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| 50 | } \
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| 51 | while (0)
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| 52 |
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| 53 | /* The name this program was run with. */
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| 54 | char *program_name;
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| 55 |
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| 56 | /* True if the LC_COLLATE locale is hard. */
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| 57 | static bool hard_LC_COLLATE;
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| 58 |
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| 59 | /* Number of fields to skip on each line when doing comparisons. */
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| 60 | static size_t skip_fields;
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| 61 |
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| 62 | /* Number of chars to skip after skipping any fields. */
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| 63 | static size_t skip_chars;
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| 64 |
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| 65 | /* Number of chars to compare. */
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| 66 | static size_t check_chars;
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| 67 |
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| 68 | enum countmode
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| 69 | {
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| 70 | count_occurrences, /* -c Print count before output lines. */
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| 71 | count_none /* Default. Do not print counts. */
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| 72 | };
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| 73 |
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| 74 | /* Whether and how to precede the output lines with a count of the number of
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| 75 | times they occurred in the input. */
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| 76 | static enum countmode countmode;
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| 77 |
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| 78 | /* Which lines to output: unique lines, the first of a group of
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| 79 | repeated lines, and the second and subsequented of a group of
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| 80 | repeated lines. */
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| 81 | static bool output_unique;
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| 82 | static bool output_first_repeated;
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| 83 | static bool output_later_repeated;
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| 84 |
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| 85 | /* If true, ignore case when comparing. */
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| 86 | static bool ignore_case;
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| 87 |
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| 88 | enum delimit_method
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| 89 | {
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| 90 | /* No delimiters output. --all-repeated[=none] */
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| 91 | DM_NONE,
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| 92 |
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| 93 | /* Delimiter precedes all groups. --all-repeated=prepend */
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| 94 | DM_PREPEND,
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| 95 |
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| 96 | /* Delimit all groups. --all-repeated=separate */
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| 97 | DM_SEPARATE
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| 98 | };
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| 99 |
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| 100 | static char const *const delimit_method_string[] =
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| 101 | {
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| 102 | "none", "prepend", "separate", NULL
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| 103 | };
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| 104 |
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| 105 | static enum delimit_method const delimit_method_map[] =
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| 106 | {
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| 107 | DM_NONE, DM_PREPEND, DM_SEPARATE
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| 108 | };
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| 109 |
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| 110 | /* Select whether/how to delimit groups of duplicate lines. */
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| 111 | static enum delimit_method delimit_groups;
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| 112 |
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| 113 | static struct option const longopts[] =
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| 114 | {
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| 115 | {"count", no_argument, NULL, 'c'},
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| 116 | {"repeated", no_argument, NULL, 'd'},
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| 117 | {"all-repeated", optional_argument, NULL, 'D'},
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| 118 | {"ignore-case", no_argument, NULL, 'i'},
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| 119 | {"unique", no_argument, NULL, 'u'},
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| 120 | {"skip-fields", required_argument, NULL, 'f'},
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| 121 | {"skip-chars", required_argument, NULL, 's'},
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| 122 | {"check-chars", required_argument, NULL, 'w'},
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| 123 | {GETOPT_HELP_OPTION_DECL},
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| 124 | {GETOPT_VERSION_OPTION_DECL},
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| 125 | {NULL, 0, NULL, 0}
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| 126 | };
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| 127 |
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| 128 | void
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| 129 | usage (int status)
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| 130 | {
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| 131 | if (status != EXIT_SUCCESS)
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| 132 | fprintf (stderr, _("Try `%s --help' for more information.\n"),
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| 133 | program_name);
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| 134 | else
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| 135 | {
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| 136 | printf (_("\
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| 137 | Usage: %s [OPTION]... [INPUT [OUTPUT]]\n\
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| 138 | "),
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| 139 | program_name);
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| 140 | fputs (_("\
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| 141 | Discard all but one of successive identical lines from INPUT (or\n\
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| 142 | standard input), writing to OUTPUT (or standard output).\n\
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| 143 | \n\
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| 144 | "), stdout);
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| 145 | fputs (_("\
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| 146 | Mandatory arguments to long options are mandatory for short options too.\n\
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| 147 | "), stdout);
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| 148 | fputs (_("\
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| 149 | -c, --count prefix lines by the number of occurrences\n\
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| 150 | -d, --repeated only print duplicate lines\n\
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| 151 | "), stdout);
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| 152 | fputs (_("\
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| 153 | -D, --all-repeated[=delimit-method] print all duplicate lines\n\
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| 154 | delimit-method={none(default),prepend,separate}\n\
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| 155 | Delimiting is done with blank lines.\n\
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| 156 | -f, --skip-fields=N avoid comparing the first N fields\n\
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| 157 | -i, --ignore-case ignore differences in case when comparing\n\
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| 158 | -s, --skip-chars=N avoid comparing the first N characters\n\
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| 159 | -u, --unique only print unique lines\n\
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| 160 | "), stdout);
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| 161 | fputs (_("\
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| 162 | -w, --check-chars=N compare no more than N characters in lines\n\
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| 163 | "), stdout);
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| 164 | fputs (HELP_OPTION_DESCRIPTION, stdout);
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| 165 | fputs (VERSION_OPTION_DESCRIPTION, stdout);
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| 166 | fputs (_("\
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| 167 | \n\
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| 168 | A field is a run of whitespace, then non-whitespace characters.\n\
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| 169 | Fields are skipped before chars.\n\
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| 170 | "), stdout);
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| 171 | printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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| 172 | }
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| 173 | exit (status);
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| 174 | }
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| 175 |
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| 176 | /* Convert OPT to size_t, reporting an error using MSGID if it does
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| 177 | not fit. */
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| 178 |
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| 179 | static size_t
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| 180 | size_opt (char const *opt, char const *msgid)
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| 181 | {
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| 182 | unsigned long int size;
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| 183 | if (xstrtoul (opt, NULL, 10, &size, "") != LONGINT_OK
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| 184 | || SIZE_MAX < size)
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| 185 | error (EXIT_FAILURE, 0, "%s: %s", opt, _(msgid));
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| 186 | return size;
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| 187 | }
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| 188 |
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| 189 | /* Given a linebuffer LINE,
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| 190 | return a pointer to the beginning of the line's field to be compared. */
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| 191 |
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| 192 | static char *
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| 193 | find_field (const struct linebuffer *line)
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| 194 | {
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| 195 | size_t count;
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| 196 | char *lp = line->buffer;
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| 197 | size_t size = line->length - 1;
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| 198 | size_t i = 0;
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| 199 |
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| 200 | for (count = 0; count < skip_fields && i < size; count++)
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| 201 | {
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| 202 | while (i < size && ISBLANK (lp[i]))
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| 203 | i++;
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| 204 | while (i < size && !ISBLANK (lp[i]))
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| 205 | i++;
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| 206 | }
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| 207 |
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| 208 | for (count = 0; count < skip_chars && i < size; count++)
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| 209 | i++;
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| 210 |
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| 211 | return lp + i;
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| 212 | }
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| 213 |
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| 214 | /* Return false if two strings OLD and NEW match, true if not.
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| 215 | OLD and NEW point not to the beginnings of the lines
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| 216 | but rather to the beginnings of the fields to compare.
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| 217 | OLDLEN and NEWLEN are their lengths. */
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| 218 |
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| 219 | static bool
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| 220 | different (char *old, char *new, size_t oldlen, size_t newlen)
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| 221 | {
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| 222 | if (check_chars < oldlen)
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| 223 | oldlen = check_chars;
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| 224 | if (check_chars < newlen)
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| 225 | newlen = check_chars;
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| 226 |
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| 227 | if (ignore_case)
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| 228 | {
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| 229 | /* FIXME: This should invoke strcoll somehow. */
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| 230 | return oldlen != newlen || memcasecmp (old, new, oldlen);
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| 231 | }
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| 232 | else if (hard_LC_COLLATE)
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| 233 | return xmemcoll (old, oldlen, new, newlen) != 0;
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| 234 | else
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| 235 | return oldlen != newlen || memcmp (old, new, oldlen);
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| 236 | }
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| 237 |
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| 238 | /* Output the line in linebuffer LINE to standard output
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| 239 | provided that the switches say it should be output.
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| 240 | MATCH is true if the line matches the previous line.
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| 241 | If requested, print the number of times it occurred, as well;
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| 242 | LINECOUNT + 1 is the number of times that the line occurred. */
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| 243 |
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| 244 | static void
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| 245 | writeline (struct linebuffer const *line,
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| 246 | bool match, uintmax_t linecount)
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| 247 | {
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| 248 | if (! (linecount == 0 ? output_unique
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| 249 | : !match ? output_first_repeated
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| 250 | : output_later_repeated))
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| 251 | return;
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| 252 |
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| 253 | if (countmode == count_occurrences)
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| 254 | printf ("%7" PRIuMAX " ", linecount + 1);
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| 255 |
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| 256 | fwrite (line->buffer, sizeof (char), line->length, stdout);
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| 257 | }
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| 258 |
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| 259 | /* Process input file INFILE with output to OUTFILE.
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| 260 | If either is "-", use the standard I/O stream for it instead. */
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| 261 |
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| 262 | static void
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| 263 | check_file (const char *infile, const char *outfile)
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| 264 | {
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| 265 | struct linebuffer lb1, lb2;
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| 266 | struct linebuffer *thisline, *prevline;
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| 267 |
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| 268 | if (! (STREQ (infile, "-") || freopen (infile, "r", stdin)))
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| 269 | error (EXIT_FAILURE, errno, "%s", infile);
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| 270 | if (! (STREQ (outfile, "-") || freopen (outfile, "w", stdout)))
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| 271 | error (EXIT_FAILURE, errno, "%s", outfile);
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| 272 |
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| 273 | thisline = &lb1;
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| 274 | prevline = &lb2;
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| 275 |
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| 276 | initbuffer (thisline);
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| 277 | initbuffer (prevline);
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| 278 |
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| 279 | /* The duplication in the following `if' and `else' blocks is an
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| 280 | optimization to distinguish the common case (in which none of
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| 281 | the following options has been specified: --count, -repeated,
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| 282 | --all-repeated, --unique) from the others. In the common case,
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| 283 | this optimization lets uniq output each different line right away,
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| 284 | without waiting to see if the next one is different. */
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| 285 |
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| 286 | if (output_unique && output_first_repeated && countmode == count_none)
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| 287 | {
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| 288 | char *prevfield IF_LINT (= NULL);
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| 289 | size_t prevlen IF_LINT (= 0);
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| 290 |
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| 291 | while (!feof (stdin))
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| 292 | {
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| 293 | char *thisfield;
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| 294 | size_t thislen;
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| 295 | if (readlinebuffer (thisline, stdin) == 0)
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| 296 | break;
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| 297 | thisfield = find_field (thisline);
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| 298 | thislen = thisline->length - 1 - (thisfield - thisline->buffer);
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| 299 | if (prevline->length == 0
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| 300 | || different (thisfield, prevfield, thislen, prevlen))
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| 301 | {
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| 302 | fwrite (thisline->buffer, sizeof (char),
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| 303 | thisline->length, stdout);
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| 304 |
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| 305 | SWAP_LINES (prevline, thisline);
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| 306 | prevfield = thisfield;
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| 307 | prevlen = thislen;
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| 308 | }
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| 309 | }
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| 310 | }
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| 311 | else
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| 312 | {
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| 313 | char *prevfield;
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| 314 | size_t prevlen;
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| 315 | uintmax_t match_count = 0;
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| 316 | bool first_delimiter = true;
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| 317 |
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| 318 | if (readlinebuffer (prevline, stdin) == 0)
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| 319 | goto closefiles;
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| 320 | prevfield = find_field (prevline);
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| 321 | prevlen = prevline->length - 1 - (prevfield - prevline->buffer);
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| 322 |
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| 323 | while (!feof (stdin))
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| 324 | {
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| 325 | bool match;
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| 326 | char *thisfield;
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| 327 | size_t thislen;
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| 328 | if (readlinebuffer (thisline, stdin) == 0)
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| 329 | {
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| 330 | if (ferror (stdin))
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| 331 | goto closefiles;
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| 332 | break;
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| 333 | }
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| 334 | thisfield = find_field (thisline);
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| 335 | thislen = thisline->length - 1 - (thisfield - thisline->buffer);
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| 336 | match = !different (thisfield, prevfield, thislen, prevlen);
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| 337 | match_count += match;
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| 338 |
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| 339 | if (match_count == UINTMAX_MAX)
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| 340 | {
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| 341 | if (count_occurrences)
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| 342 | error (EXIT_FAILURE, 0, _("too many repeated lines"));
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| 343 | match_count--;
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| 344 | }
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| 345 |
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| 346 | if (delimit_groups != DM_NONE)
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| 347 | {
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| 348 | if (!match)
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| 349 | {
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| 350 | if (match_count) /* a previous match */
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| 351 | first_delimiter = false; /* Only used when DM_SEPARATE */
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| 352 | }
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| 353 | else if (match_count == 1)
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| 354 | {
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| 355 | if ((delimit_groups == DM_PREPEND)
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| 356 | || (delimit_groups == DM_SEPARATE
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| 357 | && !first_delimiter))
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| 358 | putchar ('\n');
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| 359 | }
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| 360 | }
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| 361 |
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| 362 | if (!match || output_later_repeated)
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| 363 | {
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| 364 | writeline (prevline, match, match_count);
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| 365 | SWAP_LINES (prevline, thisline);
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| 366 | prevfield = thisfield;
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| 367 | prevlen = thislen;
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| 368 | if (!match)
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| 369 | match_count = 0;
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| 370 | }
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| 371 | }
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| 372 |
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| 373 | writeline (prevline, false, match_count);
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| 374 | }
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| 375 |
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| 376 | closefiles:
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| 377 | if (ferror (stdin) || fclose (stdin) != 0)
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| 378 | error (EXIT_FAILURE, 0, _("error reading %s"), infile);
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| 379 |
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| 380 | /* stdout is handled via the atexit-invoked close_stdout function. */
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| 381 |
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| 382 | free (lb1.buffer);
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| 383 | free (lb2.buffer);
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| 384 | }
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| 385 |
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| 386 | enum Skip_field_option_type
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| 387 | {
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| 388 | SFO_NONE,
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| 389 | SFO_OBSOLETE,
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| 390 | SFO_NEW
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| 391 | };
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| 392 |
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| 393 | int
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| 394 | main (int argc, char **argv)
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| 395 | {
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| 396 | int optc = 0;
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| 397 | bool posixly_correct = (getenv ("POSIXLY_CORRECT") != NULL);
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| 398 | enum Skip_field_option_type skip_field_option_type = SFO_NONE;
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| 399 | int nfiles = 0;
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| 400 | char const *file[2];
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| 401 |
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| 402 | file[0] = file[1] = "-";
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| 403 | initialize_main (&argc, &argv);
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| 404 | program_name = argv[0];
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| 405 | setlocale (LC_ALL, "");
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| 406 | bindtextdomain (PACKAGE, LOCALEDIR);
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| 407 | textdomain (PACKAGE);
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| 408 | hard_LC_COLLATE = hard_locale (LC_COLLATE);
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| 409 |
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| 410 | atexit (close_stdout);
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| 411 |
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| 412 | skip_chars = 0;
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| 413 | skip_fields = 0;
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| 414 | check_chars = SIZE_MAX;
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| 415 | output_unique = output_first_repeated = true;
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| 416 | output_later_repeated = false;
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| 417 | countmode = count_none;
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| 418 | delimit_groups = DM_NONE;
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| 419 |
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| 420 | for (;;)
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| 421 | {
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| 422 | /* Parse an operand with leading "+" as a file after "--" was
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| 423 | seen; or if pedantic and a file was seen; or if not
|
|---|
| 424 | obsolete. */
|
|---|
| 425 |
|
|---|
| 426 | if (optc == -1
|
|---|
| 427 | || (posixly_correct && nfiles != 0)
|
|---|
| 428 | || ((optc = getopt_long (argc, argv,
|
|---|
| 429 | "-0123456789Dcdf:is:uw:", longopts, NULL))
|
|---|
| 430 | == -1))
|
|---|
| 431 | {
|
|---|
| 432 | if (argc <= optind)
|
|---|
| 433 | break;
|
|---|
| 434 | if (nfiles == 2)
|
|---|
| 435 | {
|
|---|
| 436 | error (0, 0, _("extra operand %s"), quote (argv[optind]));
|
|---|
| 437 | usage (EXIT_FAILURE);
|
|---|
| 438 | }
|
|---|
| 439 | file[nfiles++] = argv[optind++];
|
|---|
| 440 | }
|
|---|
| 441 | else switch (optc)
|
|---|
| 442 | {
|
|---|
| 443 | case 1:
|
|---|
| 444 | {
|
|---|
| 445 | unsigned long int size;
|
|---|
| 446 | if (optarg[0] == '+'
|
|---|
| 447 | && posix2_version () < 200112
|
|---|
| 448 | && xstrtoul (optarg, NULL, 10, &size, "") == LONGINT_OK
|
|---|
| 449 | && size <= SIZE_MAX)
|
|---|
| 450 | skip_chars = size;
|
|---|
| 451 | else if (nfiles == 2)
|
|---|
| 452 | {
|
|---|
| 453 | error (0, 0, _("extra operand %s"), quote (optarg));
|
|---|
| 454 | usage (EXIT_FAILURE);
|
|---|
| 455 | }
|
|---|
| 456 | else
|
|---|
| 457 | file[nfiles++] = optarg;
|
|---|
| 458 | }
|
|---|
| 459 | break;
|
|---|
| 460 |
|
|---|
| 461 | case '0':
|
|---|
| 462 | case '1':
|
|---|
| 463 | case '2':
|
|---|
| 464 | case '3':
|
|---|
| 465 | case '4':
|
|---|
| 466 | case '5':
|
|---|
| 467 | case '6':
|
|---|
| 468 | case '7':
|
|---|
| 469 | case '8':
|
|---|
| 470 | case '9':
|
|---|
| 471 | {
|
|---|
| 472 | if (skip_field_option_type == SFO_NEW)
|
|---|
| 473 | skip_fields = 0;
|
|---|
| 474 |
|
|---|
| 475 | if (!DECIMAL_DIGIT_ACCUMULATE (skip_fields, optc - '0', size_t))
|
|---|
| 476 | error (EXIT_FAILURE, 0, "%s",
|
|---|
| 477 | _("invalid number of fields to skip"));
|
|---|
| 478 | skip_field_option_type = SFO_OBSOLETE;
|
|---|
| 479 | }
|
|---|
| 480 | break;
|
|---|
| 481 |
|
|---|
| 482 | case 'c':
|
|---|
| 483 | countmode = count_occurrences;
|
|---|
| 484 | break;
|
|---|
| 485 |
|
|---|
| 486 | case 'd':
|
|---|
| 487 | output_unique = false;
|
|---|
| 488 | break;
|
|---|
| 489 |
|
|---|
| 490 | case 'D':
|
|---|
| 491 | output_unique = false;
|
|---|
| 492 | output_later_repeated = true;
|
|---|
| 493 | if (optarg == NULL)
|
|---|
| 494 | delimit_groups = DM_NONE;
|
|---|
| 495 | else
|
|---|
| 496 | delimit_groups = XARGMATCH ("--all-repeated", optarg,
|
|---|
| 497 | delimit_method_string,
|
|---|
| 498 | delimit_method_map);
|
|---|
| 499 | break;
|
|---|
| 500 |
|
|---|
| 501 | case 'f':
|
|---|
| 502 | skip_field_option_type = SFO_NEW;
|
|---|
| 503 | skip_fields = size_opt (optarg,
|
|---|
| 504 | N_("invalid number of fields to skip"));
|
|---|
| 505 | break;
|
|---|
| 506 |
|
|---|
| 507 | case 'i':
|
|---|
| 508 | ignore_case = true;
|
|---|
| 509 | break;
|
|---|
| 510 |
|
|---|
| 511 | case 's':
|
|---|
| 512 | skip_chars = size_opt (optarg,
|
|---|
| 513 | N_("invalid number of bytes to skip"));
|
|---|
| 514 | break;
|
|---|
| 515 |
|
|---|
| 516 | case 'u':
|
|---|
| 517 | output_first_repeated = false;
|
|---|
| 518 | break;
|
|---|
| 519 |
|
|---|
| 520 | case 'w':
|
|---|
| 521 | check_chars = size_opt (optarg,
|
|---|
| 522 | N_("invalid number of bytes to compare"));
|
|---|
| 523 | break;
|
|---|
| 524 |
|
|---|
| 525 | case_GETOPT_HELP_CHAR;
|
|---|
| 526 |
|
|---|
| 527 | case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
|
|---|
| 528 |
|
|---|
| 529 | default:
|
|---|
| 530 | usage (EXIT_FAILURE);
|
|---|
| 531 | }
|
|---|
| 532 | }
|
|---|
| 533 |
|
|---|
| 534 | if (countmode == count_occurrences && output_later_repeated)
|
|---|
| 535 | {
|
|---|
| 536 | error (0, 0,
|
|---|
| 537 | _("printing all duplicated lines and repeat counts is meaningless"));
|
|---|
| 538 | usage (EXIT_FAILURE);
|
|---|
| 539 | }
|
|---|
| 540 |
|
|---|
| 541 | check_file (file[0], file[1]);
|
|---|
| 542 |
|
|---|
| 543 | exit (EXIT_SUCCESS);
|
|---|
| 544 | }
|
|---|
