| 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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