blob: b6a127809778080ffa604761affd72519302a66a
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini comm implementation for busybox |
4 | * |
5 | * Copyright (C) 2005 by Robert Sullivan <cogito.ergo.cogito@gmail.com> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
8 | */ |
9 | //config:config COMM |
10 | //config: bool "comm" |
11 | //config: default y |
12 | //config: help |
13 | //config: comm is used to compare two files line by line and return |
14 | //config: a three-column output. |
15 | |
16 | //applet:IF_COMM(APPLET(comm, BB_DIR_USR_BIN, BB_SUID_DROP)) |
17 | |
18 | //kbuild:lib-$(CONFIG_COMM) += comm.o |
19 | |
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" |
27 | |
28 | #include "libbb.h" |
29 | |
30 | #define COMM_OPT_1 (1 << 0) |
31 | #define COMM_OPT_2 (1 << 1) |
32 | #define COMM_OPT_3 (1 << 2) |
33 | |
34 | /* writeline outputs the input given, appropriately aligned according to class */ |
35 | static void writeline(char *line, int class) |
36 | { |
37 | int flags = option_mask32; |
38 | if (class == 0) { |
39 | if (flags & COMM_OPT_1) |
40 | return; |
41 | } else if (class == 1) { |
42 | if (flags & COMM_OPT_2) |
43 | return; |
44 | if (!(flags & COMM_OPT_1)) |
45 | putchar('\t'); |
46 | } else /*if (class == 2)*/ { |
47 | if (flags & COMM_OPT_3) |
48 | return; |
49 | if (!(flags & COMM_OPT_1)) |
50 | putchar('\t'); |
51 | if (!(flags & COMM_OPT_2)) |
52 | putchar('\t'); |
53 | } |
54 | puts(line); |
55 | } |
56 | |
57 | int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
58 | int comm_main(int argc UNUSED_PARAM, char **argv) |
59 | { |
60 | char *thisline[2]; |
61 | FILE *stream[2]; |
62 | int i; |
63 | int order; |
64 | |
65 | opt_complementary = "=2"; |
66 | getopt32(argv, "123"); |
67 | argv += optind; |
68 | |
69 | for (i = 0; i < 2; ++i) { |
70 | stream[i] = xfopen_stdin(argv[i]); |
71 | } |
72 | |
73 | order = 0; |
74 | thisline[1] = thisline[0] = NULL; |
75 | while (1) { |
76 | if (order <= 0) { |
77 | free(thisline[0]); |
78 | thisline[0] = xmalloc_fgetline(stream[0]); |
79 | } |
80 | if (order >= 0) { |
81 | free(thisline[1]); |
82 | thisline[1] = xmalloc_fgetline(stream[1]); |
83 | } |
84 | |
85 | i = !thisline[0] + (!thisline[1] << 1); |
86 | if (i) |
87 | break; |
88 | order = strcmp(thisline[0], thisline[1]); |
89 | |
90 | if (order >= 0) |
91 | writeline(thisline[1], order ? 1 : 2); |
92 | else |
93 | writeline(thisline[0], 0); |
94 | } |
95 | |
96 | /* EOF at least on one of the streams */ |
97 | i &= 1; |
98 | if (thisline[i]) { |
99 | /* stream[i] is not at EOF yet */ |
100 | /* we did not print thisline[i] yet */ |
101 | char *p = thisline[i]; |
102 | writeline(p, i); |
103 | while (1) { |
104 | free(p); |
105 | p = xmalloc_fgetline(stream[i]); |
106 | if (!p) |
107 | break; |
108 | writeline(p, i); |
109 | } |
110 | } |
111 | |
112 | if (ENABLE_FEATURE_CLEAN_UP) { |
113 | fclose(stream[0]); |
114 | fclose(stream[1]); |
115 | } |
116 | |
117 | return EXIT_SUCCESS; |
118 | } |
119 |