Contents of /trunk/mkinitrd-magellan/busybox/coreutils/uniq.c
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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File size: 2059 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 2059 byte(s)
-updated to busybox-1.13.4
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 | static FILE *xgetoptfile_uniq_s(char **argv, int read0write2) |
16 | { |
17 | const char *n; |
18 | |
19 | n = *argv; |
20 | if (n != NULL) { |
21 | if ((*n != '-') || n[1]) { |
22 | return xfopen(n, "r\0w" + read0write2); |
23 | } |
24 | } |
25 | return (read0write2) ? stdout : stdin; |
26 | } |
27 | |
28 | int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
29 | int uniq_main(int argc UNUSED_PARAM, char **argv) |
30 | { |
31 | FILE *in, *out; |
32 | const char *s0, *e0, *s1, *e1, *input_filename; |
33 | unsigned long dups; |
34 | unsigned skip_fields, skip_chars, max_chars; |
35 | unsigned opt; |
36 | unsigned i; |
37 | |
38 | enum { |
39 | OPT_c = 0x1, |
40 | OPT_d = 0x2, |
41 | OPT_u = 0x4, |
42 | OPT_f = 0x8, |
43 | OPT_s = 0x10, |
44 | OPT_w = 0x20, |
45 | }; |
46 | |
47 | skip_fields = skip_chars = 0; |
48 | max_chars = -1; |
49 | |
50 | opt_complementary = "f+:s+:w+"; |
51 | opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars); |
52 | argv += optind; |
53 | |
54 | input_filename = *argv; |
55 | |
56 | in = xgetoptfile_uniq_s(argv, 0); |
57 | if (*argv) { |
58 | ++argv; |
59 | } |
60 | out = xgetoptfile_uniq_s(argv, 2); |
61 | if (*argv && argv[1]) { |
62 | bb_show_usage(); |
63 | } |
64 | |
65 | s1 = e1 = NULL; /* prime the pump */ |
66 | |
67 | do { |
68 | s0 = s1; |
69 | e0 = e1; |
70 | dups = 0; |
71 | |
72 | /* gnu uniq ignores newlines */ |
73 | while ((s1 = xmalloc_fgetline(in)) != NULL) { |
74 | e1 = s1; |
75 | for (i = skip_fields; i; i--) { |
76 | e1 = skip_whitespace(e1); |
77 | e1 = skip_non_whitespace(e1); |
78 | } |
79 | for (i = skip_chars; *e1 && i; i--) { |
80 | ++e1; |
81 | } |
82 | |
83 | if (!s0 || strncmp(e0, e1, max_chars)) { |
84 | break; |
85 | } |
86 | |
87 | ++dups; /* note: testing for overflow seems excessive. */ |
88 | } |
89 | |
90 | if (s0) { |
91 | if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */ |
92 | fprintf(out, "\0%ld " + (opt & 1), dups + 1); /* 1 == OPT_c */ |
93 | fprintf(out, "%s\n", s0); |
94 | } |
95 | free((void *)s0); |
96 | } |
97 | } while (s1); |
98 | |
99 | die_if_ferror(in, input_filename); |
100 | |
101 | fflush_stdout_and_exit(EXIT_SUCCESS); |
102 | } |