1 /* vi: set sw=4 ts=4: */
3 * Mini comm implementation for busybox
5 * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 #define COMM_OPT_1 (1 << 0)
13 #define COMM_OPT_2 (1 << 1)
14 #define COMM_OPT_3 (1 << 2)
16 /* writeline outputs the input given, appropriately aligned according to class */
17 static void writeline(char *line, int class, int flags)
20 if (flags & COMM_OPT_1)
22 } else if (class == 1) {
23 if (flags & COMM_OPT_2)
25 if (!(flags & COMM_OPT_1))
27 } else /*if (class == 2)*/ {
28 if (flags & COMM_OPT_3)
30 if (!(flags & COMM_OPT_1))
32 if (!(flags & COMM_OPT_2))
38 int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
39 int comm_main(int argc, char **argv)
44 char thisline[2][LINE_LEN];
49 opt_complementary = "=2";
50 flags = getopt32(argv, "123");
53 for (i = 0; i < 2; ++i) {
54 streams[i] = (argv[i][0] == '-' && !argv[i][1]) ? stdin : xfopen(argv[i], "r");
55 fgets(thisline[i], LINE_LEN, streams[i]);
58 /* This is the real core of the program - lines are compared here */
60 while (*thisline[0] || *thisline[1]) {
64 if (feof(streams[0])) i |= BB_EOF_0;
65 if (feof(streams[1])) i |= BB_EOF_1;
69 else if (!*thisline[1])
73 tl0_len = strlen(thisline[0]);
74 tl1_len = strlen(thisline[1]);
75 order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
77 order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
81 writeline(thisline[1], 2, flags);
82 else if (order > 0 && !(i & BB_EOF_1))
83 writeline(thisline[1], 1, flags);
84 else if (order < 0 && !(i & BB_EOF_0))
85 writeline(thisline[0], 0, flags);
87 if (i & BB_EOF_0 & BB_EOF_1) {
91 i = (i & BB_EOF_0 ? 1 : 0);
92 while (!feof(streams[i])) {
93 if ((order < 0 && i) || (order > 0 && !i))
94 writeline(thisline[i], i, flags);
95 fgets(thisline[i], LINE_LEN, streams[i]);
101 fgets(thisline[1], LINE_LEN, streams[1]);
103 fgets(thisline[0], LINE_LEN, streams[0]);
107 if (ENABLE_FEATURE_CLEAN_UP) {