| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini comm implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | //usage:#define comm_trivial_usage
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| 11 | //usage: "[-123] FILE1 FILE2"
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| 12 | //usage:#define comm_full_usage "\n\n"
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| 13 | //usage: "Compare FILE1 with FILE2\n"
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| 14 | //usage: "\n -1 Suppress lines unique to FILE1"
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| 15 | //usage: "\n -2 Suppress lines unique to FILE2"
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| 16 | //usage: "\n -3 Suppress lines common to both files"
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| 17 |
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| 18 | #include "libbb.h"
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| 19 |
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| 20 | #define COMM_OPT_1 (1 << 0)
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| 21 | #define COMM_OPT_2 (1 << 1)
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| 22 | #define COMM_OPT_3 (1 << 2)
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| 23 |
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| 24 | /* writeline outputs the input given, appropriately aligned according to class */
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| 25 | static void writeline(char *line, int class)
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| 26 | {
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| 27 | int flags = option_mask32;
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| 28 | if (class == 0) {
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| 29 | if (flags & COMM_OPT_1)
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| 30 | return;
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| 31 | } else if (class == 1) {
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| 32 | if (flags & COMM_OPT_2)
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| 33 | return;
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| 34 | if (!(flags & COMM_OPT_1))
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| 35 | putchar('\t');
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| 36 | } else /*if (class == 2)*/ {
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| 37 | if (flags & COMM_OPT_3)
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| 38 | return;
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| 39 | if (!(flags & COMM_OPT_1))
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| 40 | putchar('\t');
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| 41 | if (!(flags & COMM_OPT_2))
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| 42 | putchar('\t');
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| 43 | }
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| 44 | puts(line);
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| 45 | }
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| 46 |
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| 47 | int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 48 | int comm_main(int argc UNUSED_PARAM, char **argv)
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| 49 | {
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| 50 | char *thisline[2];
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| 51 | FILE *stream[2];
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| 52 | int i;
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| 53 | int order;
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| 54 |
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| 55 | opt_complementary = "=2";
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| 56 | getopt32(argv, "123");
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| 57 | argv += optind;
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| 58 |
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| 59 | for (i = 0; i < 2; ++i) {
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| 60 | stream[i] = xfopen_stdin(argv[i]);
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| 61 | }
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| 62 |
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| 63 | order = 0;
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| 64 | thisline[1] = thisline[0] = NULL;
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| 65 | while (1) {
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| 66 | if (order <= 0) {
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| 67 | free(thisline[0]);
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| 68 | thisline[0] = xmalloc_fgetline(stream[0]);
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| 69 | }
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| 70 | if (order >= 0) {
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| 71 | free(thisline[1]);
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| 72 | thisline[1] = xmalloc_fgetline(stream[1]);
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| 73 | }
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| 74 |
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| 75 | i = !thisline[0] + (!thisline[1] << 1);
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| 76 | if (i)
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| 77 | break;
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| 78 | order = strcmp(thisline[0], thisline[1]);
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| 79 |
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| 80 | if (order >= 0)
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| 81 | writeline(thisline[1], order ? 1 : 2);
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| 82 | else
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| 83 | writeline(thisline[0], 0);
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| 84 | }
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| 85 |
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| 86 | /* EOF at least on one of the streams */
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| 87 | i &= 1;
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| 88 | if (thisline[i]) {
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| 89 | /* stream[i] is not at EOF yet */
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| 90 | /* we did not print thisline[i] yet */
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| 91 | char *p = thisline[i];
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| 92 | writeline(p, i);
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| 93 | while (1) {
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| 94 | free(p);
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| 95 | p = xmalloc_fgetline(stream[i]);
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| 96 | if (!p)
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| 97 | break;
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| 98 | writeline(p, i);
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 103 | fclose(stream[0]);
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| 104 | fclose(stream[1]);
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| 105 | }
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| 106 |
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| 107 | return EXIT_SUCCESS;
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| 108 | }
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