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Source at commit be977234bfb4a6dca8a39e7c52165e4cd536ad71 created 12 years 9 months ago. By Lars-Peter Clausen, jz4740: Fix compile error | |
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1 | #!/usr/bin/perl -w |
2 | # |
3 | # Clean a text file -- or directory of text files -- of stealth whitespace. |
4 | # WARNING: this can be a highly destructive operation. Use with caution. |
5 | # |
6 | |
7 | use bytes; |
8 | use File::Basename; |
9 | |
10 | # Default options |
11 | $max_width = 79; |
12 | |
13 | # Clean up space-tab sequences, either by removing spaces or |
14 | # replacing them with tabs. |
15 | sub clean_space_tabs($) |
16 | { |
17 | no bytes; # Tab alignment depends on characters |
18 | |
19 | my($li) = @_; |
20 | my($lo) = ''; |
21 | my $pos = 0; |
22 | my $nsp = 0; |
23 | my($i, $c); |
24 | |
25 | for ($i = 0; $i < length($li); $i++) { |
26 | $c = substr($li, $i, 1); |
27 | if ($c eq "\t") { |
28 | my $npos = ($pos+$nsp+8) & ~7; |
29 | my $ntab = ($npos >> 3) - ($pos >> 3); |
30 | $lo .= "\t" x $ntab; |
31 | $pos = $npos; |
32 | $nsp = 0; |
33 | } elsif ($c eq "\n" || $c eq "\r") { |
34 | $lo .= " " x $nsp; |
35 | $pos += $nsp; |
36 | $nsp = 0; |
37 | $lo .= $c; |
38 | $pos = 0; |
39 | } elsif ($c eq " ") { |
40 | $nsp++; |
41 | } else { |
42 | $lo .= " " x $nsp; |
43 | $pos += $nsp; |
44 | $nsp = 0; |
45 | $lo .= $c; |
46 | $pos++; |
47 | } |
48 | } |
49 | $lo .= " " x $nsp; |
50 | return $lo; |
51 | } |
52 | |
53 | # Compute the visual width of a string |
54 | sub strwidth($) { |
55 | no bytes; # Tab alignment depends on characters |
56 | |
57 | my($li) = @_; |
58 | my($c, $i); |
59 | my $pos = 0; |
60 | my $mlen = 0; |
61 | |
62 | for ($i = 0; $i < length($li); $i++) { |
63 | $c = substr($li,$i,1); |
64 | if ($c eq "\t") { |
65 | $pos = ($pos+8) & ~7; |
66 | } elsif ($c eq "\n") { |
67 | $mlen = $pos if ($pos > $mlen); |
68 | $pos = 0; |
69 | } else { |
70 | $pos++; |
71 | } |
72 | } |
73 | |
74 | $mlen = $pos if ($pos > $mlen); |
75 | return $mlen; |
76 | } |
77 | |
78 | $name = basename($0); |
79 | |
80 | @files = (); |
81 | |
82 | while (defined($a = shift(@ARGV))) { |
83 | if ($a =~ /^-/) { |
84 | if ($a eq '-width' || $a eq '-w') { |
85 | $max_width = shift(@ARGV)+0; |
86 | } else { |
87 | print STDERR "Usage: $name [-width #] files...\n"; |
88 | exit 1; |
89 | } |
90 | } else { |
91 | push(@files, $a); |
92 | } |
93 | } |
94 | |
95 | foreach $f ( @files ) { |
96 | print STDERR "$name: $f\n"; |
97 | |
98 | if (! -f $f) { |
99 | print STDERR "$f: not a file\n"; |
100 | next; |
101 | } |
102 | |
103 | if (!open(FILE, '+<', $f)) { |
104 | print STDERR "$name: Cannot open file: $f: $!\n"; |
105 | next; |
106 | } |
107 | |
108 | binmode FILE; |
109 | |
110 | # First, verify that it is not a binary file; consider any file |
111 | # with a zero byte to be a binary file. Is there any better, or |
112 | # additional, heuristic that should be applied? |
113 | $is_binary = 0; |
114 | |
115 | while (read(FILE, $data, 65536) > 0) { |
116 | if ($data =~ /\0/) { |
117 | $is_binary = 1; |
118 | last; |
119 | } |
120 | } |
121 | |
122 | if ($is_binary) { |
123 | print STDERR "$name: $f: binary file\n"; |
124 | next; |
125 | } |
126 | |
127 | seek(FILE, 0, 0); |
128 | |
129 | $in_bytes = 0; |
130 | $out_bytes = 0; |
131 | $blank_bytes = 0; |
132 | |
133 | @blanks = (); |
134 | @lines = (); |
135 | $lineno = 0; |
136 | |
137 | while ( defined($line = <FILE>) ) { |
138 | $lineno++; |
139 | $in_bytes += length($line); |
140 | $line =~ s/[ \t\r]*$//; # Remove trailing spaces |
141 | $line = clean_space_tabs($line); |
142 | |
143 | if ( $line eq "\n" ) { |
144 | push(@blanks, $line); |
145 | $blank_bytes += length($line); |
146 | } else { |
147 | push(@lines, @blanks); |
148 | $out_bytes += $blank_bytes; |
149 | push(@lines, $line); |
150 | $out_bytes += length($line); |
151 | @blanks = (); |
152 | $blank_bytes = 0; |
153 | } |
154 | |
155 | $l_width = strwidth($line); |
156 | if ($max_width && $l_width > $max_width) { |
157 | print STDERR |
158 | "$f:$lineno: line exceeds $max_width characters ($l_width)\n"; |
159 | } |
160 | } |
161 | |
162 | # Any blanks at the end of the file are discarded |
163 | |
164 | if ($in_bytes != $out_bytes) { |
165 | # Only write to the file if changed |
166 | seek(FILE, 0, 0); |
167 | print FILE @lines; |
168 | |
169 | if ( !defined($where = tell(FILE)) || |
170 | !truncate(FILE, $where) ) { |
171 | die "$name: Failed to truncate modified file: $f: $!\n"; |
172 | } |
173 | } |
174 | |
175 | close(FILE); |
176 | } |
177 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9