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 source tree.
10 //config: bool "comm (3.9 kb)"
13 //config: comm is used to compare two files line by line and return
14 //config: a three-column output.
16 //applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP))
18 //kbuild:lib-$(CONFIG_COMM) += comm.o
20 //usage:#define comm_trivial_usage
21 //usage: "[-123] FILE1 FILE2"
22 //usage:#define comm_full_usage "\n\n"
23 //usage: "Compare FILE1 with FILE2\n"
24 //usage: "\n -1 Suppress lines unique to FILE1"
25 //usage: "\n -2 Suppress lines unique to FILE2"
26 //usage: "\n -3 Suppress lines common to both files"
30 #define COMM_OPT_1 (1 << 0)
31 #define COMM_OPT_2 (1 << 1)
32 #define COMM_OPT_3 (1 << 2)
34 /* writeline outputs the input given, appropriately aligned according to class */
35 static void writeline(char *line, int class)
37 int flags = option_mask32;
39 if (flags & COMM_OPT_1)
41 } else if (class == 1) {
42 if (flags & COMM_OPT_2)
44 if (!(flags & COMM_OPT_1))
46 } else /*if (class == 2)*/ {
47 if (flags & COMM_OPT_3)
49 if (!(flags & COMM_OPT_1))
51 if (!(flags & COMM_OPT_2))
57 int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
58 int comm_main(int argc UNUSED_PARAM, char **argv)
65 getopt32(argv, "^" "123" "\0" "=2");
68 for (i = 0; i < 2; ++i) {
69 stream[i] = xfopen_stdin(argv[i]);
73 thisline[1] = thisline[0] = NULL;
77 thisline[0] = xmalloc_fgetline(stream[0]);
81 thisline[1] = xmalloc_fgetline(stream[1]);
84 i = !thisline[0] + (!thisline[1] << 1);
87 order = strcmp(thisline[0], thisline[1]);
90 writeline(thisline[1], order ? 1 : 2);
92 writeline(thisline[0], 0);
95 /* EOF at least on one of the streams */
98 /* stream[i] is not at EOF yet */
99 /* we did not print thisline[i] yet */
100 char *p = thisline[i];
104 p = xmalloc_fgetline(stream[i]);
111 if (ENABLE_FEATURE_CLEAN_UP) {