Contents of /trunk/mkinitrd-magellan/busybox/coreutils/split.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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File size: 3173 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3173 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * split - split a file into pieces |
4 | * Copyright (c) 2007 Bernhard Reutner-Fischer |
5 | * |
6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
7 | */ |
8 | /* BB_AUDIT: SUSv3 compliant |
9 | * SUSv3 requirements: |
10 | * http://www.opengroup.org/onlinepubs/009695399/utilities/split.html |
11 | */ |
12 | #include "libbb.h" |
13 | |
14 | static const struct suffix_mult split_suffices[] = { |
15 | #if ENABLE_FEATURE_SPLIT_FANCY |
16 | { "b", 512 }, |
17 | #endif |
18 | { "k", 1024 }, |
19 | { "m", 1024*1024 }, |
20 | #if ENABLE_FEATURE_SPLIT_FANCY |
21 | { "g", 1024*1024*1024 }, |
22 | #endif |
23 | { "", 0 } |
24 | }; |
25 | |
26 | /* Increment the suffix part of the filename. |
27 | * Returns NULL if we are out of filenames. |
28 | */ |
29 | static char *next_file(char *old, unsigned suffix_len) |
30 | { |
31 | size_t end = strlen(old); |
32 | unsigned i = 1; |
33 | char *curr; |
34 | |
35 | do { |
36 | curr = old + end - i; |
37 | if (*curr < 'z') { |
38 | *curr += 1; |
39 | break; |
40 | } |
41 | i++; |
42 | if (i > suffix_len) { |
43 | return NULL; |
44 | } |
45 | *curr = 'a'; |
46 | } while (1); |
47 | |
48 | return old; |
49 | } |
50 | |
51 | #define read_buffer bb_common_bufsiz1 |
52 | enum { READ_BUFFER_SIZE = COMMON_BUFSIZE - 1 }; |
53 | |
54 | #define SPLIT_OPT_l (1<<0) |
55 | #define SPLIT_OPT_b (1<<1) |
56 | #define SPLIT_OPT_a (1<<2) |
57 | |
58 | int split_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
59 | int split_main(int argc UNUSED_PARAM, char **argv) |
60 | { |
61 | unsigned suffix_len = 2; |
62 | char *pfx; |
63 | char *count_p; |
64 | const char *sfx; |
65 | off_t cnt = 1000; |
66 | off_t remaining = 0; |
67 | unsigned opt; |
68 | ssize_t bytes_read, to_write; |
69 | char *src; |
70 | |
71 | opt_complementary = "?2:a+"; /* max 2 args; -a N */ |
72 | opt = getopt32(argv, "l:b:a:", &count_p, &count_p, &suffix_len); |
73 | |
74 | if (opt & SPLIT_OPT_l) |
75 | cnt = XATOOFF(count_p); |
76 | if (opt & SPLIT_OPT_b) // FIXME: also needs XATOOFF |
77 | cnt = xatoull_sfx(count_p, split_suffices); |
78 | sfx = "x"; |
79 | |
80 | argv += optind; |
81 | if (argv[0]) { |
82 | int fd; |
83 | if (argv[1]) |
84 | sfx = argv[1]; |
85 | fd = open_or_warn_stdin(argv[0]); |
86 | if (fd == -1) |
87 | return EXIT_FAILURE; |
88 | xmove_fd(fd, STDIN_FILENO); |
89 | } else { |
90 | argv[0] = (char *) bb_msg_standard_input; |
91 | } |
92 | |
93 | if (NAME_MAX < strlen(sfx) + suffix_len) |
94 | bb_error_msg_and_die("suffix too long"); |
95 | |
96 | { |
97 | char *char_p = xzalloc(suffix_len + 1); |
98 | memset(char_p, 'a', suffix_len); |
99 | pfx = xasprintf("%s%s", sfx, char_p); |
100 | if (ENABLE_FEATURE_CLEAN_UP) |
101 | free(char_p); |
102 | } |
103 | |
104 | while (1) { |
105 | bytes_read = safe_read(STDIN_FILENO, read_buffer, READ_BUFFER_SIZE); |
106 | if (!bytes_read) |
107 | break; |
108 | if (bytes_read < 0) |
109 | bb_simple_perror_msg_and_die(argv[0]); |
110 | src = read_buffer; |
111 | do { |
112 | if (!remaining) { |
113 | if (!pfx) |
114 | bb_error_msg_and_die("suffixes exhausted"); |
115 | xmove_fd(xopen(pfx, O_WRONLY | O_CREAT | O_TRUNC), 1); |
116 | pfx = next_file(pfx, suffix_len); |
117 | remaining = cnt; |
118 | } |
119 | |
120 | if (opt & SPLIT_OPT_b) { |
121 | /* split by bytes */ |
122 | to_write = (bytes_read < remaining) ? bytes_read : remaining; |
123 | remaining -= to_write; |
124 | } else { |
125 | /* split by lines */ |
126 | /* can be sped up by using _memrchr_ |
127 | * and writing many lines at once... */ |
128 | char *end = memchr(src, '\n', bytes_read); |
129 | if (end) { |
130 | --remaining; |
131 | to_write = end - src + 1; |
132 | } else { |
133 | to_write = bytes_read; |
134 | } |
135 | } |
136 | |
137 | xwrite(STDOUT_FILENO, src, to_write); |
138 | bytes_read -= to_write; |
139 | src += to_write; |
140 | } while (bytes_read); |
141 | } |
142 | return EXIT_SUCCESS; |
143 | } |