Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Mini comm implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com> |
| 6 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 8 | */ |
Denys Vlasenko | af3f420 | 2016-11-23 14:46:56 +0100 | [diff] [blame] | 9 | //config:config COMM |
Denys Vlasenko | 4eed2c6 | 2017-07-18 22:01:24 +0200 | [diff] [blame] | 10 | //config: bool "comm (3.9 kb)" |
Denys Vlasenko | af3f420 | 2016-11-23 14:46:56 +0100 | [diff] [blame] | 11 | //config: default y |
| 12 | //config: help |
Denys Vlasenko | 72089cf | 2017-07-21 09:50:55 +0200 | [diff] [blame] | 13 | //config: comm is used to compare two files line by line and return |
| 14 | //config: a three-column output. |
Denys Vlasenko | af3f420 | 2016-11-23 14:46:56 +0100 | [diff] [blame] | 15 | |
| 16 | //applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 17 | |
| 18 | //kbuild:lib-$(CONFIG_COMM) += comm.o |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 19 | |
Pere Orga | 3442538 | 2011-03-31 14:43:25 +0200 | [diff] [blame] | 20 | //usage:#define comm_trivial_usage |
| 21 | //usage: "[-123] FILE1 FILE2" |
| 22 | //usage:#define comm_full_usage "\n\n" |
| 23 | //usage: "Compare FILE1 with FILE2\n" |
Pere Orga | 3442538 | 2011-03-31 14:43:25 +0200 | [diff] [blame] | 24 | //usage: "\n -1 Suppress lines unique to FILE1" |
| 25 | //usage: "\n -2 Suppress lines unique to FILE2" |
| 26 | //usage: "\n -3 Suppress lines common to both files" |
| 27 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 28 | #include "libbb.h" |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 29 | |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 30 | #define COMM_OPT_1 (1 << 0) |
| 31 | #define COMM_OPT_2 (1 << 1) |
| 32 | #define COMM_OPT_3 (1 << 2) |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 33 | |
| 34 | /* writeline outputs the input given, appropriately aligned according to class */ |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 35 | static void writeline(char *line, int class) |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 36 | { |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 37 | int flags = option_mask32; |
Mike Frysinger | 867a608 | 2005-05-13 00:57:30 +0000 | [diff] [blame] | 38 | if (class == 0) { |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 39 | if (flags & COMM_OPT_1) |
Mike Frysinger | 0fb397e | 2005-05-13 00:58:18 +0000 | [diff] [blame] | 40 | return; |
Mike Frysinger | 867a608 | 2005-05-13 00:57:30 +0000 | [diff] [blame] | 41 | } else if (class == 1) { |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 42 | if (flags & COMM_OPT_2) |
Mike Frysinger | dad4cf7 | 2005-05-12 22:50:12 +0000 | [diff] [blame] | 43 | return; |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 44 | if (!(flags & COMM_OPT_1)) |
Mike Frysinger | dad4cf7 | 2005-05-12 22:50:12 +0000 | [diff] [blame] | 45 | putchar('\t'); |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 46 | } else /*if (class == 2)*/ { |
| 47 | if (flags & COMM_OPT_3) |
Mike Frysinger | dad4cf7 | 2005-05-12 22:50:12 +0000 | [diff] [blame] | 48 | return; |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 49 | if (!(flags & COMM_OPT_1)) |
Mike Frysinger | dad4cf7 | 2005-05-12 22:50:12 +0000 | [diff] [blame] | 50 | putchar('\t'); |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 51 | if (!(flags & COMM_OPT_2)) |
Mike Frysinger | dad4cf7 | 2005-05-12 22:50:12 +0000 | [diff] [blame] | 52 | putchar('\t'); |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 53 | } |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 54 | puts(line); |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 55 | } |
| 56 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 57 | int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 58 | int comm_main(int argc UNUSED_PARAM, char **argv) |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 59 | { |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 60 | char *thisline[2]; |
| 61 | FILE *stream[2]; |
Mike Frysinger | 867a608 | 2005-05-13 00:57:30 +0000 | [diff] [blame] | 62 | int i; |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 63 | int order; |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 64 | |
Denys Vlasenko | 22542ec | 2017-08-08 21:55:02 +0200 | [diff] [blame^] | 65 | getopt32(argv, "^" "123" "\0" "=2"); |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 66 | argv += optind; |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 67 | |
Mike Frysinger | 867a608 | 2005-05-13 00:57:30 +0000 | [diff] [blame] | 68 | for (i = 0; i < 2; ++i) { |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 69 | stream[i] = xfopen_stdin(argv[i]); |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 70 | } |
| 71 | |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 72 | order = 0; |
| 73 | thisline[1] = thisline[0] = NULL; |
| 74 | while (1) { |
| 75 | if (order <= 0) { |
| 76 | free(thisline[0]); |
| 77 | thisline[0] = xmalloc_fgetline(stream[0]); |
| 78 | } |
| 79 | if (order >= 0) { |
| 80 | free(thisline[1]); |
| 81 | thisline[1] = xmalloc_fgetline(stream[1]); |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 82 | } |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 83 | |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 84 | i = !thisline[0] + (!thisline[1] << 1); |
| 85 | if (i) |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 86 | break; |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 87 | order = strcmp(thisline[0], thisline[1]); |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 88 | |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 89 | if (order >= 0) |
| 90 | writeline(thisline[1], order ? 1 : 2); |
| 91 | else |
| 92 | writeline(thisline[0], 0); |
| 93 | } |
Mike Frysinger | 0d605e9 | 2005-05-12 22:25:41 +0000 | [diff] [blame] | 94 | |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 95 | /* EOF at least on one of the streams */ |
| 96 | i &= 1; |
| 97 | if (thisline[i]) { |
| 98 | /* stream[i] is not at EOF yet */ |
| 99 | /* we did not print thisline[i] yet */ |
| 100 | char *p = thisline[i]; |
| 101 | writeline(p, i); |
| 102 | while (1) { |
| 103 | free(p); |
| 104 | p = xmalloc_fgetline(stream[i]); |
| 105 | if (!p) |
| 106 | break; |
| 107 | writeline(p, i); |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 108 | } |
| 109 | } |
| 110 | |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 111 | if (ENABLE_FEATURE_CLEAN_UP) { |
Denis Vlasenko | bb13079 | 2008-07-15 06:45:14 +0000 | [diff] [blame] | 112 | fclose(stream[0]); |
| 113 | fclose(stream[1]); |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 114 | } |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 115 | |
Denis Vlasenko | bb5b01c | 2007-04-07 00:45:27 +0000 | [diff] [blame] | 116 | return EXIT_SUCCESS; |
Rob Landley | 2acfd7b | 2005-05-11 23:12:49 +0000 | [diff] [blame] | 117 | } |