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144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* uniq implementation for busybox
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*
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* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config UNIQ
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//config: bool "uniq (5.1 kb)"
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//config: default y
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//config: help
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//config: uniq is used to remove duplicate lines from a sorted file.
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//applet:IF_UNIQ(APPLET(uniq, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_UNIQ) += uniq.o
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/* BB_AUDIT SUSv3 compliant */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
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//usage:#define uniq_trivial_usage
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//usage: "[-cduiz] [-f,s,w N] [FILE [OUTFILE]]"
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//usage:#define uniq_full_usage "\n\n"
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//usage: "Discard duplicate lines\n"
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//usage: "\n -c Prefix lines by the number of occurrences"
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//usage: "\n -d Only print duplicate lines"
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//usage: "\n -u Only print unique lines"
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//usage: "\n -i Ignore case"
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//usage: "\n -z NUL terminated output"
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//usage: "\n -f N Skip first N fields"
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//usage: "\n -s N Skip first N chars (after any skipped fields)"
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//usage: "\n -w N Compare N characters in line"
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//usage:
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//usage:#define uniq_example_usage
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//usage: "$ echo -e \"a\\na\\nb\\nc\\nc\\na\" | sort | uniq\n"
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//usage: "a\n"
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//usage: "b\n"
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//usage: "c\n"
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#include "libbb.h"
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int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int uniq_main(int argc UNUSED_PARAM, char **argv)
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{
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const char *input_filename;
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unsigned skip_fields, skip_chars, max_chars;
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unsigned opt;
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char eol;
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char *cur_line;
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const char *cur_compare;
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enum {
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OPT_c = 1 << 0,
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OPT_d = 1 << 1, /* print only dups */
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OPT_u = 1 << 2, /* print only uniq */
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OPT_f = 1 << 3,
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OPT_s = 1 << 4,
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OPT_w = 1 << 5,
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OPT_i = 1 << 6,
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OPT_z = 1 << 7,
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};
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skip_fields = skip_chars = 0;
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max_chars = INT_MAX;
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opt = getopt32(argv, "cduf:+s:+w:+iz", &skip_fields, &skip_chars, &max_chars);
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argv += optind;
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input_filename = argv[0];
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if (input_filename) {
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const char *output;
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if (input_filename[0] != '-' || input_filename[1]) {
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close(STDIN_FILENO); /* == 0 */
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xopen(input_filename, O_RDONLY); /* fd will be 0 */
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}
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output = argv[1];
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if (output) {
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if (argv[2])
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bb_show_usage();
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if (output[0] != '-' || output[1]) {
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// Won't work with "uniq - FILE" and closed stdin:
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//close(STDOUT_FILENO);
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//xopen(output, O_WRONLY | O_CREAT | O_TRUNC);
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xmove_fd(xopen(output, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO);
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}
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}
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}
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cur_compare = cur_line = NULL; /* prime the pump */
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eol = (opt & OPT_z) ? 0 : '\n';
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do {
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unsigned i;
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unsigned long dups;
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char *old_line;
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const char *old_compare;
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old_line = cur_line;
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old_compare = cur_compare;
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dups = 0;
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/* gnu uniq ignores newlines */
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while ((cur_line = xmalloc_fgetline(stdin)) != NULL) {
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cur_compare = cur_line;
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for (i = skip_fields; i; i--) {
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cur_compare = skip_whitespace(cur_compare);
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cur_compare = skip_non_whitespace(cur_compare);
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}
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for (i = skip_chars; *cur_compare && i; i--) {
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++cur_compare;
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}
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if (!old_line)
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break;
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if ((opt & OPT_i)
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? strncasecmp(old_compare, cur_compare, max_chars)
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: strncmp(old_compare, cur_compare, max_chars)
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) {
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break;
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}
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free(cur_line);
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++dups; /* testing for overflow seems excessive */
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}
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if (old_line) {
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if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */
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if (opt & OPT_c) {
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/* %7lu matches GNU coreutils 6.9 */
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printf("%7lu ", dups + 1);
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}
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printf("%s%c", old_line, eol);
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}
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free(old_line);
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}
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} while (cur_line);
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die_if_ferror(stdin, input_filename);
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fflush_stdout_and_exit_SUCCESS();
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}
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