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1 | # File/Copy.pm. Written in 1994 by Aaron Sherman <ajs@ajs.com>. This |
2 | # source code has been placed in the public domain by the author. |
3 | # Please be kind and preserve the documentation. |
4 | # |
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5 | # Additions copyright 1996 by Charles Bailey. Permission is granted |
6 | # to distribute the revised code under the same terms as Perl itself. |
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7 | |
8 | package File::Copy; |
9 | |
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10 | use strict; |
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11 | use Carp; |
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12 | use UNIVERSAL qw(isa); |
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13 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION $Too_Big |
14 | © &syscopy &cp &mv); |
15 | |
16 | # Note that this module implements only *part* of the API defined by |
17 | # the File/Copy.pm module of the File-Tools-2.0 package. However, that |
18 | # package has not yet been updated to work with Perl 5.004, and so it |
19 | # would be a Bad Thing for the CPAN module to grab it and replace this |
20 | # module. Therefore, we set this module's version higher than 2.0. |
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21 | $VERSION = '2.02'; |
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22 | |
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23 | require Exporter; |
24 | @ISA = qw(Exporter); |
25 | @EXPORT = qw(copy move); |
26 | @EXPORT_OK = qw(cp mv); |
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27 | |
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28 | $Too_Big = 1024 * 1024 * 2; |
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29 | |
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30 | sub _catname { # Will be replaced by File::Spec when it arrives |
31 | my($from, $to) = @_; |
32 | if (not defined &basename) { |
33 | require File::Basename; |
34 | import File::Basename 'basename'; |
35 | } |
36 | if ($^O eq 'VMS') { $to = VMS::Filespec::vmspath($to) . basename($from); } |
37 | elsif ($^O eq 'MacOS') { $to .= ':' . basename($from); } |
38 | elsif ($to =~ m|\\|) { $to .= '\\' . basename($from); } |
39 | else { $to .= '/' . basename($from); } |
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40 | } |
41 | |
42 | sub copy { |
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43 | croak("Usage: copy(FROM, TO [, BUFFERSIZE]) ") |
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44 | unless(@_ == 2 || @_ == 3); |
45 | |
46 | my $from = shift; |
47 | my $to = shift; |
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48 | |
49 | my $from_a_handle = (ref($from) |
50 | ? (ref($from) eq 'GLOB' |
51 | || isa($from, 'GLOB') || isa($from, 'IO::Handle')) |
52 | : (ref(\$from) eq 'GLOB')); |
53 | my $to_a_handle = (ref($to) |
54 | ? (ref($to) eq 'GLOB' |
55 | || isa($to, 'GLOB') || isa($to, 'IO::Handle')) |
56 | : (ref(\$to) eq 'GLOB')); |
57 | |
58 | if (!$from_a_handle && !$to_a_handle && -d $to && ! -d $from) { |
59 | $to = _catname($from, $to); |
60 | } |
61 | |
62 | if (defined &syscopy && \&syscopy != \© |
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63 | && !$to_a_handle |
64 | && !($from_a_handle && $^O eq 'os2')) # OS/2 cannot handle handles |
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65 | { |
66 | return syscopy($from, $to); |
67 | } |
68 | |
69 | my $closefrom = 0; |
70 | my $closeto = 0; |
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71 | my ($size, $status, $r, $buf); |
72 | local(*FROM, *TO); |
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73 | local($\) = ''; |
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74 | |
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75 | if ($from_a_handle) { |
76 | *FROM = *$from{FILEHANDLE}; |
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77 | } else { |
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78 | $from = "./$from" if $from =~ /^\s/; |
79 | open(FROM, "< $from\0") or goto fail_open1; |
80 | binmode FROM or die "($!,$^E)"; |
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81 | $closefrom = 1; |
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82 | } |
83 | |
84 | if ($to_a_handle) { |
85 | *TO = *$to{FILEHANDLE}; |
86 | } else { |
87 | $to = "./$to" if $to =~ /^\s/; |
88 | open(TO,"> $to\0") or goto fail_open2; |
89 | binmode TO or die "($!,$^E)"; |
90 | $closeto = 1; |
91 | } |
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92 | |
93 | if (@_) { |
94 | $size = shift(@_) + 0; |
95 | croak("Bad buffer size for copy: $size\n") unless ($size > 0); |
96 | } else { |
97 | $size = -s FROM; |
98 | $size = 1024 if ($size < 512); |
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99 | $size = $Too_Big if ($size > $Too_Big); |
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100 | } |
101 | |
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102 | $! = 0; |
103 | for (;;) { |
104 | my ($r, $w, $t); |
105 | defined($r = sysread(FROM, $buf, $size)) |
106 | or goto fail_inner; |
107 | last unless $r; |
108 | for ($w = 0; $w < $r; $w += $t) { |
109 | $t = syswrite(TO, $buf, $r - $w, $w) |
110 | or goto fail_inner; |
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111 | } |
112 | } |
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113 | |
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114 | close(TO) || goto fail_open2 if $closeto; |
115 | close(FROM) || goto fail_open1 if $closefrom; |
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116 | |
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117 | # Use this idiom to avoid uninitialized value warning. |
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118 | return 1; |
119 | |
120 | # All of these contortions try to preserve error messages... |
121 | fail_inner: |
122 | if ($closeto) { |
123 | $status = $!; |
124 | $! = 0; |
125 | close TO; |
126 | $! = $status unless $!; |
127 | } |
128 | fail_open2: |
129 | if ($closefrom) { |
130 | $status = $!; |
131 | $! = 0; |
132 | close FROM; |
133 | $! = $status unless $!; |
134 | } |
135 | fail_open1: |
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136 | return 0; |
137 | } |
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138 | |
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139 | sub move { |
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140 | my($from,$to) = @_; |
141 | my($copied,$fromsz,$tosz1,$tomt1,$tosz2,$tomt2,$sts,$ossts); |
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142 | |
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143 | if (-d $to && ! -d $from) { |
144 | $to = _catname($from, $to); |
145 | } |
146 | |
147 | ($tosz1,$tomt1) = (stat($to))[7,9]; |
148 | $fromsz = -s $from; |
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149 | if ($^O eq 'os2' and defined $tosz1 and defined $fromsz) { |
150 | # will not rename with overwrite |
151 | unlink $to; |
152 | } |
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153 | return 1 if rename $from, $to; |
154 | |
155 | ($sts,$ossts) = ($! + 0, $^E + 0); |
156 | # Did rename return an error even though it succeeded, because $to |
157 | # is on a remote NFS file system, and NFS lost the server's ack? |
158 | return 1 if defined($fromsz) && !-e $from && # $from disappeared |
159 | (($tosz2,$tomt2) = (stat($to))[7,9]) && # $to's there |
160 | ($tosz1 != $tosz2 or $tomt1 != $tomt2) && # and changed |
161 | $tosz2 == $fromsz; # it's all there |
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162 | |
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163 | ($tosz1,$tomt1) = (stat($to))[7,9]; # just in case rename did something |
164 | return 1 if ($copied = copy($from,$to)) && unlink($from); |
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165 | |
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166 | ($tosz2,$tomt2) = ((stat($to))[7,9],0,0) if defined $tomt1; |
167 | unlink($to) if !defined($tomt1) or $tomt1 != $tomt2 or $tosz1 != $tosz2; |
168 | ($!,$^E) = ($sts,$ossts); |
169 | return 0; |
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170 | } |
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171 | |
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172 | *cp = \© |
173 | *mv = \&move; |
174 | |
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175 | # &syscopy is an XSUB under OS/2 |
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176 | *syscopy = ($^O eq 'VMS' ? \&rmscopy : \©) unless defined &syscopy; |
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177 | |
178 | 1; |
179 | |
180 | __END__ |
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181 | |
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182 | =head1 NAME |
183 | |
184 | File::Copy - Copy files or filehandles |
185 | |
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186 | =head1 SYNOPSIS |
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187 | |
188 | use File::Copy; |
189 | |
190 | copy("file1","file2"); |
191 | copy("Copy.pm",\*STDOUT);' |
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192 | move("/dev1/fileA","/dev2/fileB"); |
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193 | |
194 | use POSIX; |
195 | use File::Copy cp; |
196 | |
197 | $n=FileHandle->new("/dev/null","r"); |
198 | cp($n,"x");' |
199 | |
200 | =head1 DESCRIPTION |
201 | |
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202 | The File::Copy module provides two basic functions, C<copy> and |
203 | C<move>, which are useful for getting the contents of a file from |
204 | one place to another. |
205 | |
206 | =over 4 |
207 | |
208 | =item * |
209 | |
210 | The C<copy> function takes two |
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211 | parameters: a file to copy from and a file to copy to. Either |
212 | argument may be a string, a FileHandle reference or a FileHandle |
213 | glob. Obviously, if the first argument is a filehandle of some |
214 | sort, it will be read from, and if it is a file I<name> it will |
215 | be opened for reading. Likewise, the second argument will be |
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216 | written to (and created if need be). |
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217 | |
218 | B<Note that passing in |
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219 | files as handles instead of names may lead to loss of information |
220 | on some operating systems; it is recommended that you use file |
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221 | names whenever possible.> Files are opened in binary mode where |
222 | applicable. To get a consistent behavour when copying from a |
223 | filehandle to a file, use C<binmode> on the filehandle. |
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224 | |
225 | An optional third parameter can be used to specify the buffer |
226 | size used for copying. This is the number of bytes from the |
227 | first file, that wil be held in memory at any given time, before |
228 | being written to the second file. The default buffer size depends |
229 | upon the file, but will generally be the whole file (up to 2Mb), or |
230 | 1k for filehandles that do not reference files (eg. sockets). |
231 | |
232 | You may use the syntax C<use File::Copy "cp"> to get at the |
233 | "cp" alias for this function. The syntax is I<exactly> the same. |
234 | |
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235 | =item * |
236 | |
237 | The C<move> function also takes two parameters: the current name |
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238 | and the intended name of the file to be moved. If the destination |
239 | already exists and is a directory, and the source is not a |
240 | directory, then the source file will be renamed into the directory |
241 | specified by the destination. |
242 | |
243 | If possible, move() will simply rename the file. Otherwise, it copies |
244 | the file to the new location and deletes the original. If an error occurs |
245 | during this copy-and-delete process, you may be left with a (possibly partial) |
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246 | copy of the file under the destination name. |
247 | |
248 | You may use the "mv" alias for this function in the same way that |
249 | you may use the "cp" alias for C<copy>. |
250 | |
251 | =back |
252 | |
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253 | File::Copy also provides the C<syscopy> routine, which copies the |
254 | file specified in the first parameter to the file specified in the |
255 | second parameter, preserving OS-specific attributes and file |
256 | structure. For Unix systems, this is equivalent to the simple |
257 | C<copy> routine. For VMS systems, this calls the C<rmscopy> |
258 | routine (see below). For OS/2 systems, this calls the C<syscopy> |
259 | XSUB directly. |
260 | |
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261 | =head2 Special behavior if C<syscopy> is defined (VMS and OS/2) |
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262 | |
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263 | If both arguments to C<copy> are not file handles, |
264 | then C<copy> will perform a "system copy" of |
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265 | the input file to a new output file, in order to preserve file |
266 | attributes, indexed file structure, I<etc.> The buffer size |
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267 | parameter is ignored. If either argument to C<copy> is a |
268 | handle to an opened file, then data is copied using Perl |
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269 | operators, and no effort is made to preserve file attributes |
270 | or record structure. |
271 | |
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272 | The system copy routine may also be called directly under VMS and OS/2 |
273 | as C<File::Copy::syscopy> (or under VMS as C<File::Copy::rmscopy>, which |
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274 | is the routine that does the actual work for syscopy). |
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275 | |
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276 | =over 4 |
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277 | |
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278 | =item rmscopy($from,$to[,$date_flag]) |
279 | |
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280 | The first and second arguments may be strings, typeglobs, typeglob |
281 | references, or objects inheriting from IO::Handle; |
282 | they are used in all cases to obtain the |
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283 | I<filespec> of the input and output files, respectively. The |
284 | name and type of the input file are used as defaults for the |
285 | output file, if necessary. |
286 | |
287 | A new version of the output file is always created, which |
288 | inherits the structure and RMS attributes of the input file, |
289 | except for owner and protections (and possibly timestamps; |
290 | see below). All data from the input file is copied to the |
291 | output file; if either of the first two parameters to C<rmscopy> |
292 | is a file handle, its position is unchanged. (Note that this |
293 | means a file handle pointing to the output file will be |
294 | associated with an old version of that file after C<rmscopy> |
295 | returns, not the newly created version.) |
296 | |
297 | The third parameter is an integer flag, which tells C<rmscopy> |
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298 | how to handle timestamps. If it is E<lt> 0, none of the input file's |
299 | timestamps are propagated to the output file. If it is E<gt> 0, then |
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300 | it is interpreted as a bitmask: if bit 0 (the LSB) is set, then |
301 | timestamps other than the revision date are propagated; if bit 1 |
302 | is set, the revision date is propagated. If the third parameter |
303 | to C<rmscopy> is 0, then it behaves much like the DCL COPY command: |
304 | if the name or type of the output file was explicitly specified, |
305 | then no timestamps are propagated, but if they were taken implicitly |
306 | from the input filespec, then all timestamps other than the |
307 | revision date are propagated. If this parameter is not supplied, |
308 | it defaults to 0. |
309 | |
310 | Like C<copy>, C<rmscopy> returns 1 on success. If an error occurs, |
311 | it sets C<$!>, deletes the output file, and returns 0. |
312 | |
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313 | =back |
314 | |
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315 | =head1 RETURN |
316 | |
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317 | All functions return 1 on success, 0 on failure. |
318 | $! will be set if an error was encountered. |
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319 | |
320 | =head1 AUTHOR |
321 | |
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322 | File::Copy was written by Aaron Sherman I<E<lt>ajs@ajs.comE<gt>> in 1995, |
323 | and updated by Charles Bailey I<E<lt>bailey@genetics.upenn.eduE<gt>> in 1996. |
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324 | |
325 | =cut |
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326 | |