1/* vi: set sw=4 ts=4: */ 2/* 3 * uniq implementation for busybox 4 * 5 * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> 6 * 7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. 8 */ 9 10/* BB_AUDIT SUSv3 compliant */ 11/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */ 12 13#include "libbb.h" 14 15int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 16int uniq_main(int argc UNUSED_PARAM, char **argv) 17{ 18 const char *input_filename; 19 unsigned skip_fields, skip_chars, max_chars; 20 unsigned opt; 21 char *cur_line; 22 const char *cur_compare; 23 24 enum { 25 OPT_c = 0x1, 26 OPT_d = 0x2, /* print only dups */ 27 OPT_u = 0x4, /* print only uniq */ 28 OPT_f = 0x8, 29 OPT_s = 0x10, 30 OPT_w = 0x20, 31 }; 32 33 skip_fields = skip_chars = 0; 34 max_chars = INT_MAX; 35 36 opt_complementary = "f+:s+:w+"; 37 opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars); 38 argv += optind; 39 40 input_filename = argv[0]; 41 if (input_filename) { 42 const char *output; 43 44 if (input_filename[0] != '-' || input_filename[1]) { 45 close(STDIN_FILENO); /* == 0 */ 46 xopen(input_filename, O_RDONLY); /* fd will be 0 */ 47 } 48 output = argv[1]; 49 if (output) { 50 if (argv[2]) 51 bb_show_usage(); 52 if (output[0] != '-' || output[1]) { 53 // Won't work with "uniq - FILE" and closed stdin: 54 //close(STDOUT_FILENO); 55 //xopen3(output, O_WRONLY | O_CREAT | O_TRUNC, 0666); 56 xmove_fd(xopen3(output, O_WRONLY | O_CREAT | O_TRUNC, 0666), STDOUT_FILENO); 57 } 58 } 59 } 60 61 cur_compare = cur_line = NULL; /* prime the pump */ 62 63 do { 64 unsigned i; 65 unsigned long dups; 66 char *old_line; 67 const char *old_compare; 68 69 old_line = cur_line; 70 old_compare = cur_compare; 71 dups = 0; 72 73 /* gnu uniq ignores newlines */ 74 while ((cur_line = xmalloc_fgetline(stdin)) != NULL) { 75 cur_compare = cur_line; 76 for (i = skip_fields; i; i--) { 77 cur_compare = skip_whitespace(cur_compare); 78 cur_compare = skip_non_whitespace(cur_compare); 79 } 80 for (i = skip_chars; *cur_compare && i; i--) { 81 ++cur_compare; 82 } 83 84 if (!old_line || strncmp(old_compare, cur_compare, max_chars)) { 85 break; 86 } 87 88 free(cur_line); 89 ++dups; /* testing for overflow seems excessive */ 90 } 91 92 if (old_line) { 93 if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */ 94 if (opt & OPT_c) { 95 /* %7lu matches GNU coreutils 6.9 */ 96 printf("%7lu ", dups + 1); 97 } 98 printf("%s\n", old_line); 99 } 100 free(old_line); 101 } 102 } while (cur_line); 103 104 die_if_ferror(stdin, input_filename); 105 106 fflush_stdout_and_exit(EXIT_SUCCESS); 107} 108