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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