| /* vi: set sw=4 ts=4: */ |
| /* |
| * uniq implementation for busybox |
| * |
| * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config UNIQ |
| //config: bool "uniq" |
| //config: default y |
| //config: help |
| //config: uniq is used to remove duplicate lines from a sorted file. |
| |
| //applet:IF_UNIQ(APPLET(uniq, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_UNIQ) += uniq.o |
| |
| /* BB_AUDIT SUSv3 compliant */ |
| /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */ |
| |
| //usage:#define uniq_trivial_usage |
| //usage: "[-cdu][-f,s,w N] [INPUT [OUTPUT]]" |
| //usage:#define uniq_full_usage "\n\n" |
| //usage: "Discard duplicate lines\n" |
| //usage: "\n -c Prefix lines by the number of occurrences" |
| //usage: "\n -d Only print duplicate lines" |
| //usage: "\n -u Only print unique lines" |
| //usage: "\n -f N Skip first N fields" |
| //usage: "\n -s N Skip first N chars (after any skipped fields)" |
| //usage: "\n -w N Compare N characters in line" |
| //usage: |
| //usage:#define uniq_example_usage |
| //usage: "$ echo -e \"a\\na\\nb\\nc\\nc\\na\" | sort | uniq\n" |
| //usage: "a\n" |
| //usage: "b\n" |
| //usage: "c\n" |
| |
| #include "libbb.h" |
| |
| int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int uniq_main(int argc UNUSED_PARAM, char **argv) |
| { |
| const char *input_filename; |
| unsigned skip_fields, skip_chars, max_chars; |
| unsigned opt; |
| char *cur_line; |
| const char *cur_compare; |
| |
| enum { |
| OPT_c = 0x1, |
| OPT_d = 0x2, /* print only dups */ |
| OPT_u = 0x4, /* print only uniq */ |
| OPT_f = 0x8, |
| OPT_s = 0x10, |
| OPT_w = 0x20, |
| }; |
| |
| skip_fields = skip_chars = 0; |
| max_chars = INT_MAX; |
| |
| opt = getopt32(argv, "cduf:+s:+w:+", &skip_fields, &skip_chars, &max_chars); |
| argv += optind; |
| |
| input_filename = argv[0]; |
| if (input_filename) { |
| const char *output; |
| |
| if (input_filename[0] != '-' || input_filename[1]) { |
| close(STDIN_FILENO); /* == 0 */ |
| xopen(input_filename, O_RDONLY); /* fd will be 0 */ |
| } |
| output = argv[1]; |
| if (output) { |
| if (argv[2]) |
| bb_show_usage(); |
| if (output[0] != '-' || output[1]) { |
| // Won't work with "uniq - FILE" and closed stdin: |
| //close(STDOUT_FILENO); |
| //xopen(output, O_WRONLY | O_CREAT | O_TRUNC); |
| xmove_fd(xopen(output, O_WRONLY | O_CREAT | O_TRUNC), STDOUT_FILENO); |
| } |
| } |
| } |
| |
| cur_compare = cur_line = NULL; /* prime the pump */ |
| |
| do { |
| unsigned i; |
| unsigned long dups; |
| char *old_line; |
| const char *old_compare; |
| |
| old_line = cur_line; |
| old_compare = cur_compare; |
| dups = 0; |
| |
| /* gnu uniq ignores newlines */ |
| while ((cur_line = xmalloc_fgetline(stdin)) != NULL) { |
| cur_compare = cur_line; |
| for (i = skip_fields; i; i--) { |
| cur_compare = skip_whitespace(cur_compare); |
| cur_compare = skip_non_whitespace(cur_compare); |
| } |
| for (i = skip_chars; *cur_compare && i; i--) { |
| ++cur_compare; |
| } |
| |
| if (!old_line || strncmp(old_compare, cur_compare, max_chars)) { |
| break; |
| } |
| |
| free(cur_line); |
| ++dups; /* testing for overflow seems excessive */ |
| } |
| |
| if (old_line) { |
| if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */ |
| if (opt & OPT_c) { |
| /* %7lu matches GNU coreutils 6.9 */ |
| printf("%7lu ", dups + 1); |
| } |
| puts(old_line); |
| } |
| free(old_line); |
| } |
| } while (cur_line); |
| |
| die_if_ferror(stdin, input_filename); |
| |
| fflush_stdout_and_exit(EXIT_SUCCESS); |
| } |