Contents of /tags/mkinitrd-6_3_3/busybox/coreutils/uniq.c
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Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
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Wed Dec 15 21:43:57 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 2535 byte(s)
tagged 'mkinitrd-6_3_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * uniq implementation for busybox |
4 | * |
5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
8 | */ |
9 | |
10 | /* BB_AUDIT SUSv3 compliant */ |
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */ |
12 | |
13 | #include "libbb.h" |
14 | |
15 | int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
16 | int uniq_main(int argc UNUSED_PARAM, char **argv) |
17 | { |
18 | const char *input_filename; |
19 | unsigned skip_fields, skip_chars, max_chars; |
20 | unsigned opt; |
21 | char *cur_line; |
22 | const char *cur_compare; |
23 | |
24 | enum { |
25 | OPT_c = 0x1, |
26 | OPT_d = 0x2, /* print only dups */ |
27 | OPT_u = 0x4, /* print only uniq */ |
28 | OPT_f = 0x8, |
29 | OPT_s = 0x10, |
30 | OPT_w = 0x20, |
31 | }; |
32 | |
33 | skip_fields = skip_chars = 0; |
34 | max_chars = INT_MAX; |
35 | |
36 | opt_complementary = "f+:s+:w+"; |
37 | opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars); |
38 | argv += optind; |
39 | |
40 | input_filename = argv[0]; |
41 | if (input_filename) { |
42 | const char *output; |
43 | |
44 | if (input_filename[0] != '-' || input_filename[1]) { |
45 | close(STDIN_FILENO); /* == 0 */ |
46 | xopen(input_filename, O_RDONLY); /* fd will be 0 */ |
47 | } |
48 | output = argv[1]; |
49 | if (output) { |
50 | if (argv[2]) |
51 | bb_show_usage(); |
52 | if (output[0] != '-' || output[1]) { |
53 | // Won't work with "uniq - FILE" and closed stdin: |
54 | //close(STDOUT_FILENO); |
55 | //xopen3(output, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
56 | xmove_fd(xopen3(output, O_WRONLY | O_CREAT | O_TRUNC, 0666), STDOUT_FILENO); |
57 | } |
58 | } |
59 | } |
60 | |
61 | cur_compare = cur_line = NULL; /* prime the pump */ |
62 | |
63 | do { |
64 | unsigned i; |
65 | unsigned long dups; |
66 | char *old_line; |
67 | const char *old_compare; |
68 | |
69 | old_line = cur_line; |
70 | old_compare = cur_compare; |
71 | dups = 0; |
72 | |
73 | /* gnu uniq ignores newlines */ |
74 | while ((cur_line = xmalloc_fgetline(stdin)) != NULL) { |
75 | cur_compare = cur_line; |
76 | for (i = skip_fields; i; i--) { |
77 | cur_compare = skip_whitespace(cur_compare); |
78 | cur_compare = skip_non_whitespace(cur_compare); |
79 | } |
80 | for (i = skip_chars; *cur_compare && i; i--) { |
81 | ++cur_compare; |
82 | } |
83 | |
84 | if (!old_line || strncmp(old_compare, cur_compare, max_chars)) { |
85 | break; |
86 | } |
87 | |
88 | free(cur_line); |
89 | ++dups; /* testing for overflow seems excessive */ |
90 | } |
91 | |
92 | if (old_line) { |
93 | if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_u) */ |
94 | if (opt & OPT_c) { |
95 | /* %7lu matches GNU coreutils 6.9 */ |
96 | printf("%7lu ", dups + 1); |
97 | } |
98 | printf("%s\n", old_line); |
99 | } |
100 | free(old_line); |
101 | } |
102 | } while (cur_line); |
103 | |
104 | die_if_ferror(stdin, input_filename); |
105 | |
106 | fflush_stdout_and_exit(EXIT_SUCCESS); |
107 | } |