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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 vars qw(@ISA @EXPORT @EXPORT_OK $VERSION $Too_Big |
13 | © &syscopy &cp &mv); |
14 | |
15 | # Note that this module implements only *part* of the API defined by |
16 | # the File/Copy.pm module of the File-Tools-2.0 package. However, that |
17 | # package has not yet been updated to work with Perl 5.004, and so it |
18 | # would be a Bad Thing for the CPAN module to grab it and replace this |
19 | # module. Therefore, we set this module's version higher than 2.0. |
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20 | $VERSION = '2.02'; |
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21 | |
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22 | require Exporter; |
23 | @ISA = qw(Exporter); |
24 | @EXPORT = qw(copy move); |
25 | @EXPORT_OK = qw(cp mv); |
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26 | |
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27 | $Too_Big = 1024 * 1024 * 2; |
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28 | |
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29 | sub _catname { # Will be replaced by File::Spec when it arrives |
30 | my($from, $to) = @_; |
31 | if (not defined &basename) { |
32 | require File::Basename; |
33 | import File::Basename 'basename'; |
34 | } |
35 | if ($^O eq 'VMS') { $to = VMS::Filespec::vmspath($to) . basename($from); } |
36 | elsif ($^O eq 'MacOS') { $to .= ':' . basename($from); } |
37 | elsif ($to =~ m|\\|) { $to .= '\\' . basename($from); } |
38 | else { $to .= '/' . basename($from); } |
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39 | } |
40 | |
41 | sub copy { |
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42 | croak("Usage: copy(FROM, TO [, BUFFERSIZE]) ") |
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43 | unless(@_ == 2 || @_ == 3); |
44 | |
45 | my $from = shift; |
46 | my $to = shift; |
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47 | |
48 | my $from_a_handle = (ref($from) |
49 | ? (ref($from) eq 'GLOB' |
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50 | || UNIVERSAL::isa($from, 'GLOB') |
51 | || UNIVERSAL::isa($from, 'IO::Handle')) |
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52 | : (ref(\$from) eq 'GLOB')); |
53 | my $to_a_handle = (ref($to) |
54 | ? (ref($to) eq 'GLOB' |
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55 | || UNIVERSAL::isa($to, 'GLOB') |
56 | || UNIVERSAL::isa($to, 'IO::Handle')) |
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57 | : (ref(\$to) eq 'GLOB')); |
58 | |
59 | if (!$from_a_handle && !$to_a_handle && -d $to && ! -d $from) { |
60 | $to = _catname($from, $to); |
61 | } |
62 | |
63 | if (defined &syscopy && \&syscopy != \© |
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64 | && !$to_a_handle |
65 | && !($from_a_handle && $^O eq 'os2')) # OS/2 cannot handle handles |
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66 | { |
67 | return syscopy($from, $to); |
68 | } |
69 | |
70 | my $closefrom = 0; |
71 | my $closeto = 0; |
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72 | my ($size, $status, $r, $buf); |
73 | local(*FROM, *TO); |
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74 | local($\) = ''; |
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75 | |
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76 | if ($from_a_handle) { |
77 | *FROM = *$from{FILEHANDLE}; |
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78 | } else { |
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79 | $from = "./$from" if $from =~ /^\s/; |
80 | open(FROM, "< $from\0") or goto fail_open1; |
81 | binmode FROM or die "($!,$^E)"; |
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82 | $closefrom = 1; |
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83 | } |
84 | |
85 | if ($to_a_handle) { |
86 | *TO = *$to{FILEHANDLE}; |
87 | } else { |
88 | $to = "./$to" if $to =~ /^\s/; |
89 | open(TO,"> $to\0") or goto fail_open2; |
90 | binmode TO or die "($!,$^E)"; |
91 | $closeto = 1; |
92 | } |
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93 | |
94 | if (@_) { |
95 | $size = shift(@_) + 0; |
96 | croak("Bad buffer size for copy: $size\n") unless ($size > 0); |
97 | } else { |
98 | $size = -s FROM; |
99 | $size = 1024 if ($size < 512); |
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100 | $size = $Too_Big if ($size > $Too_Big); |
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101 | } |
102 | |
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103 | $! = 0; |
104 | for (;;) { |
105 | my ($r, $w, $t); |
106 | defined($r = sysread(FROM, $buf, $size)) |
107 | or goto fail_inner; |
108 | last unless $r; |
109 | for ($w = 0; $w < $r; $w += $t) { |
110 | $t = syswrite(TO, $buf, $r - $w, $w) |
111 | or goto fail_inner; |
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112 | } |
113 | } |
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114 | |
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115 | close(TO) || goto fail_open2 if $closeto; |
116 | close(FROM) || goto fail_open1 if $closefrom; |
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117 | |
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118 | # Use this idiom to avoid uninitialized value warning. |
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119 | return 1; |
120 | |
121 | # All of these contortions try to preserve error messages... |
122 | fail_inner: |
123 | if ($closeto) { |
124 | $status = $!; |
125 | $! = 0; |
126 | close TO; |
127 | $! = $status unless $!; |
128 | } |
129 | fail_open2: |
130 | if ($closefrom) { |
131 | $status = $!; |
132 | $! = 0; |
133 | close FROM; |
134 | $! = $status unless $!; |
135 | } |
136 | fail_open1: |
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137 | return 0; |
138 | } |
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139 | |
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140 | sub move { |
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141 | my($from,$to) = @_; |
142 | my($copied,$fromsz,$tosz1,$tomt1,$tosz2,$tomt2,$sts,$ossts); |
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143 | |
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144 | if (-d $to && ! -d $from) { |
145 | $to = _catname($from, $to); |
146 | } |
147 | |
148 | ($tosz1,$tomt1) = (stat($to))[7,9]; |
149 | $fromsz = -s $from; |
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150 | if ($^O eq 'os2' and defined $tosz1 and defined $fromsz) { |
151 | # will not rename with overwrite |
152 | unlink $to; |
153 | } |
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154 | return 1 if rename $from, $to; |
155 | |
156 | ($sts,$ossts) = ($! + 0, $^E + 0); |
157 | # Did rename return an error even though it succeeded, because $to |
158 | # is on a remote NFS file system, and NFS lost the server's ack? |
159 | return 1 if defined($fromsz) && !-e $from && # $from disappeared |
160 | (($tosz2,$tomt2) = (stat($to))[7,9]) && # $to's there |
161 | ($tosz1 != $tosz2 or $tomt1 != $tomt2) && # and changed |
162 | $tosz2 == $fromsz; # it's all there |
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163 | |
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164 | ($tosz1,$tomt1) = (stat($to))[7,9]; # just in case rename did something |
165 | return 1 if ($copied = copy($from,$to)) && unlink($from); |
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166 | |
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167 | ($tosz2,$tomt2) = ((stat($to))[7,9],0,0) if defined $tomt1; |
168 | unlink($to) if !defined($tomt1) or $tomt1 != $tomt2 or $tosz1 != $tosz2; |
169 | ($!,$^E) = ($sts,$ossts); |
170 | return 0; |
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171 | } |
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172 | |
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173 | *cp = \© |
174 | *mv = \&move; |
175 | |
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176 | # &syscopy is an XSUB under OS/2 |
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177 | *syscopy = ($^O eq 'VMS' ? \&rmscopy : \©) unless defined &syscopy; |
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178 | |
179 | 1; |
180 | |
181 | __END__ |
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182 | |
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183 | =head1 NAME |
184 | |
185 | File::Copy - Copy files or filehandles |
186 | |
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187 | =head1 SYNOPSIS |
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188 | |
189 | use File::Copy; |
190 | |
191 | copy("file1","file2"); |
192 | copy("Copy.pm",\*STDOUT);' |
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193 | move("/dev1/fileA","/dev2/fileB"); |
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194 | |
195 | use POSIX; |
196 | use File::Copy cp; |
197 | |
198 | $n=FileHandle->new("/dev/null","r"); |
199 | cp($n,"x");' |
200 | |
201 | =head1 DESCRIPTION |
202 | |
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203 | The File::Copy module provides two basic functions, C<copy> and |
204 | C<move>, which are useful for getting the contents of a file from |
205 | one place to another. |
206 | |
207 | =over 4 |
208 | |
209 | =item * |
210 | |
211 | The C<copy> function takes two |
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212 | parameters: a file to copy from and a file to copy to. Either |
213 | argument may be a string, a FileHandle reference or a FileHandle |
214 | glob. Obviously, if the first argument is a filehandle of some |
215 | sort, it will be read from, and if it is a file I<name> it will |
216 | be opened for reading. Likewise, the second argument will be |
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217 | written to (and created if need be). |
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218 | |
219 | B<Note that passing in |
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220 | files as handles instead of names may lead to loss of information |
221 | on some operating systems; it is recommended that you use file |
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222 | names whenever possible.> Files are opened in binary mode where |
223 | applicable. To get a consistent behavour when copying from a |
224 | filehandle to a file, use C<binmode> on the filehandle. |
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225 | |
226 | An optional third parameter can be used to specify the buffer |
227 | size used for copying. This is the number of bytes from the |
228 | first file, that wil be held in memory at any given time, before |
229 | being written to the second file. The default buffer size depends |
230 | upon the file, but will generally be the whole file (up to 2Mb), or |
231 | 1k for filehandles that do not reference files (eg. sockets). |
232 | |
233 | You may use the syntax C<use File::Copy "cp"> to get at the |
234 | "cp" alias for this function. The syntax is I<exactly> the same. |
235 | |
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236 | =item * |
237 | |
238 | The C<move> function also takes two parameters: the current name |
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239 | and the intended name of the file to be moved. If the destination |
240 | already exists and is a directory, and the source is not a |
241 | directory, then the source file will be renamed into the directory |
242 | specified by the destination. |
243 | |
244 | If possible, move() will simply rename the file. Otherwise, it copies |
245 | the file to the new location and deletes the original. If an error occurs |
246 | during this copy-and-delete process, you may be left with a (possibly partial) |
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247 | copy of the file under the destination name. |
248 | |
249 | You may use the "mv" alias for this function in the same way that |
250 | you may use the "cp" alias for C<copy>. |
251 | |
252 | =back |
253 | |
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254 | File::Copy also provides the C<syscopy> routine, which copies the |
255 | file specified in the first parameter to the file specified in the |
256 | second parameter, preserving OS-specific attributes and file |
257 | structure. For Unix systems, this is equivalent to the simple |
258 | C<copy> routine. For VMS systems, this calls the C<rmscopy> |
259 | routine (see below). For OS/2 systems, this calls the C<syscopy> |
260 | XSUB directly. |
261 | |
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262 | =head2 Special behavior if C<syscopy> is defined (VMS and OS/2) |
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263 | |
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264 | If both arguments to C<copy> are not file handles, |
265 | then C<copy> will perform a "system copy" of |
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266 | the input file to a new output file, in order to preserve file |
267 | attributes, indexed file structure, I<etc.> The buffer size |
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268 | parameter is ignored. If either argument to C<copy> is a |
269 | handle to an opened file, then data is copied using Perl |
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270 | operators, and no effort is made to preserve file attributes |
271 | or record structure. |
272 | |
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273 | The system copy routine may also be called directly under VMS and OS/2 |
274 | as C<File::Copy::syscopy> (or under VMS as C<File::Copy::rmscopy>, which |
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275 | is the routine that does the actual work for syscopy). |
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276 | |
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277 | =over 4 |
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278 | |
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279 | =item rmscopy($from,$to[,$date_flag]) |
280 | |
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281 | The first and second arguments may be strings, typeglobs, typeglob |
282 | references, or objects inheriting from IO::Handle; |
283 | they are used in all cases to obtain the |
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284 | I<filespec> of the input and output files, respectively. The |
285 | name and type of the input file are used as defaults for the |
286 | output file, if necessary. |
287 | |
288 | A new version of the output file is always created, which |
289 | inherits the structure and RMS attributes of the input file, |
290 | except for owner and protections (and possibly timestamps; |
291 | see below). All data from the input file is copied to the |
292 | output file; if either of the first two parameters to C<rmscopy> |
293 | is a file handle, its position is unchanged. (Note that this |
294 | means a file handle pointing to the output file will be |
295 | associated with an old version of that file after C<rmscopy> |
296 | returns, not the newly created version.) |
297 | |
298 | The third parameter is an integer flag, which tells C<rmscopy> |
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299 | how to handle timestamps. If it is E<lt> 0, none of the input file's |
300 | timestamps are propagated to the output file. If it is E<gt> 0, then |
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301 | it is interpreted as a bitmask: if bit 0 (the LSB) is set, then |
302 | timestamps other than the revision date are propagated; if bit 1 |
303 | is set, the revision date is propagated. If the third parameter |
304 | to C<rmscopy> is 0, then it behaves much like the DCL COPY command: |
305 | if the name or type of the output file was explicitly specified, |
306 | then no timestamps are propagated, but if they were taken implicitly |
307 | from the input filespec, then all timestamps other than the |
308 | revision date are propagated. If this parameter is not supplied, |
309 | it defaults to 0. |
310 | |
311 | Like C<copy>, C<rmscopy> returns 1 on success. If an error occurs, |
312 | it sets C<$!>, deletes the output file, and returns 0. |
313 | |
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314 | =back |
315 | |
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316 | =head1 RETURN |
317 | |
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318 | All functions return 1 on success, 0 on failure. |
319 | $! will be set if an error was encountered. |
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320 | |
321 | =head1 AUTHOR |
322 | |
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323 | File::Copy was written by Aaron Sherman I<E<lt>ajs@ajs.comE<gt>> in 1995, |
324 | and updated by Charles Bailey I<E<lt>bailey@genetics.upenn.eduE<gt>> in 1996. |
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325 | |
326 | =cut |
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327 | |