Annotation of /trunk/mkinitrd-magellan/busybox/coreutils/fold.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 4374 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* fold -- wrap each input line to fit in specified width. | ||
3 | |||
4 | Written by David MacKenzie, djm@gnu.ai.mit.edu. | ||
5 | Copyright (C) 91, 1995-2002 Free Software Foundation, Inc. | ||
6 | |||
7 | Modified for busybox based on coreutils v 5.0 | ||
8 | niro | 816 | Copyright (C) 2003 Glenn McGrath |
9 | niro | 532 | |
10 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
11 | */ | ||
12 | niro | 816 | #include "libbb.h" |
13 | niro | 984 | #include "unicode.h" |
14 | niro | 532 | |
15 | niro | 816 | /* Must match getopt32 call */ |
16 | #define FLAG_COUNT_BYTES 1 | ||
17 | #define FLAG_BREAK_SPACES 2 | ||
18 | #define FLAG_WIDTH 4 | ||
19 | niro | 532 | |
20 | /* Assuming the current column is COLUMN, return the column that | ||
21 | printing C will move the cursor to. | ||
22 | The first column is 0. */ | ||
23 | niro | 984 | static int adjust_column(unsigned column, char c) |
24 | niro | 532 | { |
25 | niro | 984 | if (option_mask32 & FLAG_COUNT_BYTES) |
26 | return ++column; | ||
27 | |||
28 | if (c == '\t') | ||
29 | return column + 8 - column % 8; | ||
30 | |||
31 | if (c == '\b') { | ||
32 | if ((int)--column < 0) | ||
33 | niro | 532 | column = 0; |
34 | niro | 984 | } |
35 | else if (c == '\r') | ||
36 | column = 0; | ||
37 | else { /* just a printable char */ | ||
38 | if (unicode_status != UNICODE_ON /* every byte is a new char */ | ||
39 | || (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */ | ||
40 | ) { | ||
41 | niro | 532 | column++; |
42 | niro | 984 | } |
43 | } | ||
44 | niro | 532 | return column; |
45 | } | ||
46 | |||
47 | niro | 984 | /* Note that this function can write NULs, unlike fputs etc. */ |
48 | static void write2stdout(const void *buf, unsigned size) | ||
49 | { | ||
50 | fwrite(buf, 1, size, stdout); | ||
51 | } | ||
52 | |||
53 | niro | 816 | int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
54 | niro | 984 | int fold_main(int argc UNUSED_PARAM, char **argv) |
55 | niro | 532 | { |
56 | niro | 816 | char *line_out = NULL; |
57 | niro | 984 | const char *w_opt = "80"; |
58 | unsigned width; | ||
59 | smallint exitcode = EXIT_SUCCESS; | ||
60 | niro | 532 | |
61 | niro | 984 | init_unicode(); |
62 | |||
63 | niro | 532 | if (ENABLE_INCLUDE_SUSv2) { |
64 | /* Turn any numeric options into -w options. */ | ||
65 | niro | 984 | int i; |
66 | for (i = 1; argv[i]; i++) { | ||
67 | const char *a = argv[i]; | ||
68 | if (*a == '-') { | ||
69 | a++; | ||
70 | niro | 816 | if (*a == '-' && !a[1]) /* "--" */ |
71 | niro | 532 | break; |
72 | niro | 816 | if (isdigit(*a)) |
73 | niro | 532 | argv[i] = xasprintf("-w%s", a); |
74 | } | ||
75 | } | ||
76 | } | ||
77 | |||
78 | niro | 816 | getopt32(argv, "bsw:", &w_opt); |
79 | niro | 984 | width = xatou_range(w_opt, 1, 10000); |
80 | niro | 532 | |
81 | argv += optind; | ||
82 | niro | 816 | if (!*argv) |
83 | *--argv = (char*)"-"; | ||
84 | niro | 532 | |
85 | do { | ||
86 | FILE *istream = fopen_or_warn_stdin(*argv); | ||
87 | int c; | ||
88 | niro | 984 | unsigned column = 0; /* Screen column where next char will go */ |
89 | unsigned offset_out = 0; /* Index in 'line_out' for next char */ | ||
90 | niro | 532 | |
91 | if (istream == NULL) { | ||
92 | niro | 984 | exitcode = EXIT_FAILURE; |
93 | niro | 532 | continue; |
94 | } | ||
95 | |||
96 | while ((c = getc(istream)) != EOF) { | ||
97 | niro | 984 | /* We grow line_out in chunks of 0x1000 bytes */ |
98 | if ((offset_out & 0xfff) == 0) { | ||
99 | line_out = xrealloc(line_out, offset_out + 0x1000); | ||
100 | niro | 532 | } |
101 | niro | 984 | rescan: |
102 | line_out[offset_out] = c; | ||
103 | niro | 532 | if (c == '\n') { |
104 | niro | 984 | write2stdout(line_out, offset_out + 1); |
105 | niro | 532 | column = offset_out = 0; |
106 | continue; | ||
107 | } | ||
108 | column = adjust_column(column, c); | ||
109 | niro | 984 | if (column <= width || offset_out == 0) { |
110 | /* offset_out == 0 case happens | ||
111 | * with small width (say, 1) and tabs. | ||
112 | * The very first tab already goes to column 8, | ||
113 | * but we must not wrap it */ | ||
114 | offset_out++; | ||
115 | continue; | ||
116 | } | ||
117 | niro | 532 | |
118 | niro | 984 | /* This character would make the line too long. |
119 | * Print the line plus a newline, and make this character | ||
120 | * start the next line */ | ||
121 | if (option_mask32 & FLAG_BREAK_SPACES) { | ||
122 | unsigned i; | ||
123 | unsigned logical_end; | ||
124 | niro | 532 | |
125 | niro | 984 | /* Look for the last blank. */ |
126 | for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) { | ||
127 | if (!isblank(line_out[logical_end])) | ||
128 | niro | 532 | continue; |
129 | niro | 984 | |
130 | /* Found a space or tab. | ||
131 | * Output up to and including it, and start a new line */ | ||
132 | logical_end++; | ||
133 | /*line_out[logical_end] = '\n'; - NO! this nukes one buffered character */ | ||
134 | write2stdout(line_out, logical_end); | ||
135 | putchar('\n'); | ||
136 | /* Move the remainder to the beginning of the next line. | ||
137 | * The areas being copied here might overlap. */ | ||
138 | memmove(line_out, line_out + logical_end, offset_out - logical_end); | ||
139 | offset_out -= logical_end; | ||
140 | for (column = i = 0; i < offset_out; i++) { | ||
141 | column = adjust_column(column, line_out[i]); | ||
142 | niro | 532 | } |
143 | niro | 984 | goto rescan; |
144 | niro | 532 | } |
145 | niro | 984 | /* No blank found, wrap will split the overlong word */ |
146 | niro | 532 | } |
147 | niro | 984 | /* Output what we accumulated up to now, and start a new line */ |
148 | line_out[offset_out] = '\n'; | ||
149 | write2stdout(line_out, offset_out + 1); | ||
150 | column = offset_out = 0; | ||
151 | goto rescan; | ||
152 | } /* while (not EOF) */ | ||
153 | niro | 532 | |
154 | if (offset_out) { | ||
155 | niro | 984 | write2stdout(line_out, offset_out); |
156 | niro | 532 | } |
157 | |||
158 | niro | 816 | if (fclose_if_not_stdin(istream)) { |
159 | niro | 984 | bb_simple_perror_msg(*argv); |
160 | exitcode = EXIT_FAILURE; | ||
161 | niro | 532 | } |
162 | } while (*++argv); | ||
163 | |||
164 | niro | 984 | fflush_stdout_and_exit(exitcode); |
165 | niro | 532 | } |