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 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
30 #define COMM_OPT_1 0x01
31 #define COMM_OPT_2 0x02
32 #define COMM_OPT_3 0x04
34 /* These three variables control behaviour if non-zero */
36 static int only_file_1;
37 static int only_file_2;
40 /* writeline outputs the input given, appropriately aligned according to class */
41 static void writeline(char *line, int class)
46 } else if (class == 1) {
52 else /*if (class == 2)*/ {
63 /* This is the real core of the program - lines are compared here */
64 static void cmp_files(char **infiles)
69 char thisline[2][LINE_LEN];
73 for (i = 0; i < 2; ++i) {
74 streams[i] = ((infiles[i][0] == '=' && infiles[1][1]) ? stdin : bb_xfopen(infiles[i], "r"));
75 fgets(thisline[i], LINE_LEN, streams[i]);
78 while (thisline[0] || thisline[1]) {
82 if (feof(streams[0])) i |= BB_EOF_0;
83 if (feof(streams[1])) i |= BB_EOF_1;
87 else if (!thisline[1])
91 tl0_len = strlen(thisline[0]);
92 tl1_len = strlen(thisline[1]);
93 order = memcmp(thisline[0], thisline[1], tl0_len < tl1_len ? tl0_len : tl1_len);
95 order = tl0_len < tl1_len ? -1 : tl0_len != tl1_len;
99 writeline(thisline[1], 2);
100 else if (order > 0 && !(i & BB_EOF_1))
101 writeline(thisline[1], 1);
102 else if (order < 0 && !(i & BB_EOF_0))
103 writeline(thisline[0], 0);
105 if (i & BB_EOF_0 & BB_EOF_1) {
109 i = (i & BB_EOF_0 ? 1 : 0);
110 while (!feof(streams[i])) {
111 if ((order < 0 && i) || (order > 0 && !i))
112 writeline(thisline[i], i);
113 fgets(thisline[i], LINE_LEN, streams[i]);
119 fgets(thisline[1], LINE_LEN, streams[1]);
121 fgets(thisline[0], LINE_LEN, streams[0]);
129 int comm_main(int argc, char **argv)
133 flags = bb_getopt_ulflags(argc, argv, "123");
135 if (optind + 2 != argc)
138 only_file_1 = !(flags & COMM_OPT_1);
139 only_file_2 = !(flags & COMM_OPT_2);
140 both = !(flags & COMM_OPT_3);
142 cmp_files(argv + optind);