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 <stdio.h>
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11 | #include <stdlib.h>
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12 | #include <string.h>
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13 | #include <unistd.h>
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14 | #include "busybox.h"
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15 |
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16 | #define COMM_OPT_1 0x01
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17 | #define COMM_OPT_2 0x02
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18 | #define COMM_OPT_3 0x04
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19 |
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20 | /* These three variables control behaviour if non-zero */
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21 |
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22 | static int only_file_1;
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23 | static int only_file_2;
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24 | static int both;
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25 |
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26 | /* writeline outputs the input given, appropriately aligned according to class */
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27 | static void writeline(char *line, int class)
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28 | {
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29 | if (class == 0) {
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30 | if (!only_file_1)
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31 | return;
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32 | } else if (class == 1) {
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33 | if (!only_file_2)
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34 | return;
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35 | if (only_file_1)
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36 | putchar('\t');
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37 | }
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38 | else /*if (class == 2)*/ {
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39 | if (!both)
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40 | return;
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41 | if (only_file_1)
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42 | putchar('\t');
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43 | if (only_file_2)
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44 | putchar('\t');
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45 | }
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46 | fputs(line, stdout);
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47 | }
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48 |
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49 | /* This is the real core of the program - lines are compared here */
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50 | static void cmp_files(char **infiles)
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51 | {
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52 | #define LINE_LEN 100
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53 | #define BB_EOF_0 0x1
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54 | #define BB_EOF_1 0x2
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55 | char thisline[2][LINE_LEN];
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56 | FILE *streams[2];
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57 | int i;
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58 |
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59 | for (i = 0; i < 2; ++i) {
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60 | streams[i] = ((infiles[i][0] == '=' && infiles[i][1]) ? stdin : bb_xfopen(infiles[i], "r"));
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61 | fgets(thisline[i], LINE_LEN, streams[i]);
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62 | }
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63 |
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64 | while (*thisline[0] || *thisline[1]) {
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65 | int order = 0;
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66 |
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67 | i = 0;
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68 | if (feof(streams[0])) i |= BB_EOF_0;
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69 | if (feof(streams[1])) i |= BB_EOF_1;
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70 |
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71 | if (!*thisline[0])
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72 | order = 1;
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73 | else if (!*thisline[1])
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74 | order = -1;
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75 | else {
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76 | int tl0_len, tl1_len;
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77 | tl0_len = strlen(thisline[0]);
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78 | tl1_len = strlen(thisline[1]);
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79 | order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
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80 | if (!order)
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81 | order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
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82 | }
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83 |
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84 | if (order == 0 && !i)
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85 | writeline(thisline[1], 2);
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86 | else if (order > 0 && !(i & BB_EOF_1))
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87 | writeline(thisline[1], 1);
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88 | else if (order < 0 && !(i & BB_EOF_0))
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89 | writeline(thisline[0], 0);
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90 |
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91 | if (i & BB_EOF_0 & BB_EOF_1) {
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92 | break;
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93 |
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94 | } else if (i) {
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95 | i = (i & BB_EOF_0 ? 1 : 0);
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96 | while (!feof(streams[i])) {
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97 | if ((order < 0 && i) || (order > 0 && !i))
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98 | writeline(thisline[i], i);
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99 | fgets(thisline[i], LINE_LEN, streams[i]);
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100 | }
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101 | break;
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102 |
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103 | } else {
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104 | if (order >= 0)
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105 | fgets(thisline[1], LINE_LEN, streams[1]);
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106 | if (order <= 0)
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107 | fgets(thisline[0], LINE_LEN, streams[0]);
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108 | }
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109 | }
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110 |
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111 | fclose(streams[0]);
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112 | fclose(streams[1]);
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113 | }
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114 |
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115 | int comm_main(int argc, char **argv)
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116 | {
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117 | unsigned long flags;
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118 |
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119 | flags = bb_getopt_ulflags(argc, argv, "123");
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120 |
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121 | if (optind + 2 != argc)
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122 | bb_show_usage();
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123 |
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124 | only_file_1 = !(flags & COMM_OPT_1);
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125 | only_file_2 = !(flags & COMM_OPT_2);
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126 | both = !(flags & COMM_OPT_3);
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127 |
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128 | cmp_files(argv + optind);
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129 | exit(EXIT_SUCCESS);
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130 | }
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