blob: b6a127809778080ffa604761affd72519302a66a
| 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 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 8 | */ |
| 9 | //config:config COMM |
| 10 | //config: bool "comm" |
| 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: comm is used to compare two files line by line and return |
| 14 | //config: a three-column output. |
| 15 | |
| 16 | //applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 17 | |
| 18 | //kbuild:lib-$(CONFIG_COMM) += comm.o |
| 19 | |
| 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" |
| 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 | |
| 28 | #include "libbb.h" |
| 29 | |
| 30 | #define COMM_OPT_1 (1 << 0) |
| 31 | #define COMM_OPT_2 (1 << 1) |
| 32 | #define COMM_OPT_3 (1 << 2) |
| 33 | |
| 34 | /* writeline outputs the input given, appropriately aligned according to class */ |
| 35 | static void writeline(char *line, int class) |
| 36 | { |
| 37 | int flags = option_mask32; |
| 38 | if (class == 0) { |
| 39 | if (flags & COMM_OPT_1) |
| 40 | return; |
| 41 | } else if (class == 1) { |
| 42 | if (flags & COMM_OPT_2) |
| 43 | return; |
| 44 | if (!(flags & COMM_OPT_1)) |
| 45 | putchar('\t'); |
| 46 | } else /*if (class == 2)*/ { |
| 47 | if (flags & COMM_OPT_3) |
| 48 | return; |
| 49 | if (!(flags & COMM_OPT_1)) |
| 50 | putchar('\t'); |
| 51 | if (!(flags & COMM_OPT_2)) |
| 52 | putchar('\t'); |
| 53 | } |
| 54 | puts(line); |
| 55 | } |
| 56 | |
| 57 | int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 58 | int comm_main(int argc UNUSED_PARAM, char **argv) |
| 59 | { |
| 60 | char *thisline[2]; |
| 61 | FILE *stream[2]; |
| 62 | int i; |
| 63 | int order; |
| 64 | |
| 65 | opt_complementary = "=2"; |
| 66 | getopt32(argv, "123"); |
| 67 | argv += optind; |
| 68 | |
| 69 | for (i = 0; i < 2; ++i) { |
| 70 | stream[i] = xfopen_stdin(argv[i]); |
| 71 | } |
| 72 | |
| 73 | order = 0; |
| 74 | thisline[1] = thisline[0] = NULL; |
| 75 | while (1) { |
| 76 | if (order <= 0) { |
| 77 | free(thisline[0]); |
| 78 | thisline[0] = xmalloc_fgetline(stream[0]); |
| 79 | } |
| 80 | if (order >= 0) { |
| 81 | free(thisline[1]); |
| 82 | thisline[1] = xmalloc_fgetline(stream[1]); |
| 83 | } |
| 84 | |
| 85 | i = !thisline[0] + (!thisline[1] << 1); |
| 86 | if (i) |
| 87 | break; |
| 88 | order = strcmp(thisline[0], thisline[1]); |
| 89 | |
| 90 | if (order >= 0) |
| 91 | writeline(thisline[1], order ? 1 : 2); |
| 92 | else |
| 93 | writeline(thisline[0], 0); |
| 94 | } |
| 95 | |
| 96 | /* EOF at least on one of the streams */ |
| 97 | i &= 1; |
| 98 | if (thisline[i]) { |
| 99 | /* stream[i] is not at EOF yet */ |
| 100 | /* we did not print thisline[i] yet */ |
| 101 | char *p = thisline[i]; |
| 102 | writeline(p, i); |
| 103 | while (1) { |
| 104 | free(p); |
| 105 | p = xmalloc_fgetline(stream[i]); |
| 106 | if (!p) |
| 107 | break; |
| 108 | writeline(p, i); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 113 | fclose(stream[0]); |
| 114 | fclose(stream[1]); |
| 115 | } |
| 116 | |
| 117 | return EXIT_SUCCESS; |
| 118 | } |
| 119 |