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 tarball for details.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | #define COMM_OPT_1 (1 << 0)
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13 | #define COMM_OPT_2 (1 << 1)
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14 | #define COMM_OPT_3 (1 << 2)
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15 |
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16 | /* writeline outputs the input given, appropriately aligned according to class */
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17 | static void writeline(char *line, int class, int flags)
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18 | {
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19 | if (class == 0) {
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20 | if (flags & COMM_OPT_1)
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21 | return;
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22 | } else if (class == 1) {
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23 | if (flags & COMM_OPT_2)
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24 | return;
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25 | if (!(flags & COMM_OPT_1))
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26 | putchar('\t');
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27 | } else /*if (class == 2)*/ {
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28 | if (flags & COMM_OPT_3)
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29 | return;
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30 | if (!(flags & COMM_OPT_1))
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31 | putchar('\t');
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32 | if (!(flags & COMM_OPT_2))
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33 | putchar('\t');
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34 | }
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35 | fputs(line, stdout);
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36 | }
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37 |
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38 | int comm_main(int argc, char **argv);
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39 | int comm_main(int argc, char **argv)
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40 | {
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41 | #define LINE_LEN 100
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42 | #define BB_EOF_0 0x1
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43 | #define BB_EOF_1 0x2
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44 | char thisline[2][LINE_LEN];
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45 | FILE *streams[2];
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46 | int i;
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47 | unsigned flags;
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48 |
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49 | opt_complementary = "=2";
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50 | flags = getopt32(argv, "123");
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51 | argv += optind;
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52 |
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53 | for (i = 0; i < 2; ++i) {
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54 | streams[i] = (argv[i][0] == '-' && !argv[i][1]) ? stdin : xfopen(argv[i], "r");
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55 | fgets(thisline[i], LINE_LEN, streams[i]);
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56 | }
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57 |
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58 | /* This is the real core of the program - lines are compared here */
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59 |
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60 | while (*thisline[0] || *thisline[1]) {
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61 | int order = 0;
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62 |
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63 | i = 0;
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64 | if (feof(streams[0])) i |= BB_EOF_0;
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65 | if (feof(streams[1])) i |= BB_EOF_1;
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66 |
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67 | if (!*thisline[0])
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68 | order = 1;
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69 | else if (!*thisline[1])
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70 | order = -1;
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71 | else {
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72 | int tl0_len, tl1_len;
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73 | tl0_len = strlen(thisline[0]);
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74 | tl1_len = strlen(thisline[1]);
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75 | order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
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76 | if (!order)
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77 | order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
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78 | }
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79 |
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80 | if (order == 0 && !i)
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81 | writeline(thisline[1], 2, flags);
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82 | else if (order > 0 && !(i & BB_EOF_1))
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83 | writeline(thisline[1], 1, flags);
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84 | else if (order < 0 && !(i & BB_EOF_0))
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85 | writeline(thisline[0], 0, flags);
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86 |
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87 | if (i & BB_EOF_0 & BB_EOF_1) {
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88 | break;
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89 |
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90 | } else if (i) {
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91 | i = (i & BB_EOF_0 ? 1 : 0);
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92 | while (!feof(streams[i])) {
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93 | if ((order < 0 && i) || (order > 0 && !i))
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94 | writeline(thisline[i], i, flags);
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95 | fgets(thisline[i], LINE_LEN, streams[i]);
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96 | }
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97 | break;
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98 |
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99 | } else {
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100 | if (order >= 0)
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101 | fgets(thisline[1], LINE_LEN, streams[1]);
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102 | if (order <= 0)
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103 | fgets(thisline[0], LINE_LEN, streams[0]);
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104 | }
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105 | }
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106 |
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107 | if (ENABLE_FEATURE_CLEAN_UP) {
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108 | fclose(streams[0]);
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109 | fclose(streams[1]);
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110 | }
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111 |
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112 | return EXIT_SUCCESS;
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113 | }
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