/* 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 (4.8 kb)" //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-$(CONFIG_UNIQ) += uniq.o /* BB_AUDIT SUSv3 compliant */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */ //usage:#define uniq_trivial_usage //usage: "[-cdu][-f,s,w N] [INPUT [OUTPUT]]" //usage:#define uniq_full_usage "\n\n" //usage: "Discard duplicate lines\n" //usage: "\n -c Prefix lines by the number of occurrences" //usage: "\n -d Only print duplicate lines" //usage: "\n -u Only print unique lines" //usage: "\n -i Ignore case" //usage: "\n -f N Skip first N fields" //usage: "\n -s N Skip first N chars (after any skipped fields)" //usage: "\n -w N Compare N characters in line" //usage: //usage:#define uniq_example_usage //usage: "$ 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, OPT_i = 0x40, }; skip_fields = skip_chars = 0; max_chars = INT_MAX; opt = getopt32(argv, "cduf:+s:+w:+i", &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) break; if ((opt & OPT_i) ? strncasecmp(old_compare, cur_compare, max_chars) : 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); }