blob: cd450950b5772a4c62768398086e71d09ecc32ed
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 | |
10 | //usage:#define comm_trivial_usage |
11 | //usage: "[-123] FILE1 FILE2" |
12 | //usage:#define comm_full_usage "\n\n" |
13 | //usage: "Compare FILE1 with FILE2\n" |
14 | //usage: "\n -1 Suppress lines unique to FILE1" |
15 | //usage: "\n -2 Suppress lines unique to FILE2" |
16 | //usage: "\n -3 Suppress lines common to both files" |
17 | |
18 | #include "libbb.h" |
19 | |
20 | #define COMM_OPT_1 (1 << 0) |
21 | #define COMM_OPT_2 (1 << 1) |
22 | #define COMM_OPT_3 (1 << 2) |
23 | |
24 | /* writeline outputs the input given, appropriately aligned according to class */ |
25 | static void writeline(char *line, int class) |
26 | { |
27 | int flags = option_mask32; |
28 | if (class == 0) { |
29 | if (flags & COMM_OPT_1) |
30 | return; |
31 | } else if (class == 1) { |
32 | if (flags & COMM_OPT_2) |
33 | return; |
34 | if (!(flags & COMM_OPT_1)) |
35 | putchar('\t'); |
36 | } else /*if (class == 2)*/ { |
37 | if (flags & COMM_OPT_3) |
38 | return; |
39 | if (!(flags & COMM_OPT_1)) |
40 | putchar('\t'); |
41 | if (!(flags & COMM_OPT_2)) |
42 | putchar('\t'); |
43 | } |
44 | puts(line); |
45 | } |
46 | |
47 | int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
48 | int comm_main(int argc UNUSED_PARAM, char **argv) |
49 | { |
50 | char *thisline[2]; |
51 | FILE *stream[2]; |
52 | int i; |
53 | int order; |
54 | |
55 | opt_complementary = "=2"; |
56 | getopt32(argv, "123"); |
57 | argv += optind; |
58 | |
59 | for (i = 0; i < 2; ++i) { |
60 | stream[i] = xfopen_stdin(argv[i]); |
61 | } |
62 | |
63 | order = 0; |
64 | thisline[1] = thisline[0] = NULL; |
65 | while (1) { |
66 | if (order <= 0) { |
67 | free(thisline[0]); |
68 | thisline[0] = xmalloc_fgetline(stream[0]); |
69 | } |
70 | if (order >= 0) { |
71 | free(thisline[1]); |
72 | thisline[1] = xmalloc_fgetline(stream[1]); |
73 | } |
74 | |
75 | i = !thisline[0] + (!thisline[1] << 1); |
76 | if (i) |
77 | break; |
78 | order = strcmp(thisline[0], thisline[1]); |
79 | |
80 | if (order >= 0) |
81 | writeline(thisline[1], order ? 1 : 2); |
82 | else |
83 | writeline(thisline[0], 0); |
84 | } |
85 | |
86 | /* EOF at least on one of the streams */ |
87 | i &= 1; |
88 | if (thisline[i]) { |
89 | /* stream[i] is not at EOF yet */ |
90 | /* we did not print thisline[i] yet */ |
91 | char *p = thisline[i]; |
92 | writeline(p, i); |
93 | while (1) { |
94 | free(p); |
95 | p = xmalloc_fgetline(stream[i]); |
96 | if (!p) |
97 | break; |
98 | writeline(p, i); |
99 | } |
100 | } |
101 | |
102 | if (ENABLE_FEATURE_CLEAN_UP) { |
103 | fclose(stream[0]); |
104 | fclose(stream[1]); |
105 | } |
106 | |
107 | return EXIT_SUCCESS; |
108 | } |
109 |