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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 | # |
5 | |
6 | package File::Copy; |
7 | |
8 | require Exporter; |
9 | use Carp; |
10 | |
11 | @ISA=qw(Exporter); |
12 | @EXPORT=qw(copy); |
13 | @EXPORT_OK=qw(copy cp); |
14 | |
15 | $File::Copy::VERSION = '1.5'; |
16 | $File::Copy::Too_Big = 1024 * 1024 * 2; |
17 | |
18 | sub VERSION { |
19 | # Version of File::Copy |
20 | return $File::Copy::VERSION; |
21 | } |
22 | |
23 | sub copy { |
24 | croak("Usage: copy( file1, file2 [, buffersize]) ") |
25 | unless(@_ == 2 || @_ == 3); |
26 | |
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27 | if (($^O eq 'VMS' or $^O eq 'os2') && ref(\$to) ne 'GLOB' && |
28 | !(defined ref $to and (ref($to) eq 'GLOB' || |
29 | ref($to) eq 'FileHandle' || ref($to) eq 'VMS::Stdio'))) |
30 | { return File::Copy::syscopy($_[0],$_[1]) } |
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31 | |
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32 | my $from = shift; |
33 | my $to = shift; |
34 | my $recsep = $\; |
35 | my $closefrom=0; |
36 | my $closeto=0; |
37 | my ($size, $status, $r, $buf); |
38 | local(*FROM, *TO); |
39 | |
40 | $\ = ''; |
41 | |
42 | if (ref(\$from) eq 'GLOB') { |
43 | *FROM = $from; |
44 | } elsif (defined ref $from and |
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45 | (ref($from) eq 'GLOB' || ref($from) eq 'FileHandle' || |
46 | ref($from) eq 'VMS::Stdio')) { |
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47 | *FROM = *$from; |
48 | } else { |
49 | open(FROM,"<$from")||goto(fail_open1); |
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50 | binmode FROM; |
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51 | $closefrom = 1; |
52 | } |
53 | |
54 | if (ref(\$to) eq 'GLOB') { |
55 | *TO = $to; |
56 | } elsif (defined ref $to and |
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57 | (ref($to) eq 'GLOB' || ref($to) eq 'FileHandle' || |
58 | ref($to) eq 'VMS::Stdio')) { |
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59 | *TO = *$to; |
60 | } else { |
61 | open(TO,">$to")||goto(fail_open2); |
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62 | binmode TO; |
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63 | $closeto=1; |
64 | } |
65 | |
66 | if (@_) { |
67 | $size = shift(@_) + 0; |
68 | croak("Bad buffer size for copy: $size\n") unless ($size > 0); |
69 | } else { |
70 | $size = -s FROM; |
71 | $size = 1024 if ($size < 512); |
72 | $size = $File::Copy::Too_Big if ($size > $File::Copy::Too_Big); |
73 | } |
74 | |
75 | $buf = ''; |
76 | while(defined($r = read(FROM,$buf,$size)) && $r > 0) { |
77 | if (syswrite (TO,$buf,$r) != $r) { |
78 | goto fail_inner; |
79 | } |
80 | } |
81 | goto fail_inner unless(defined($r)); |
82 | close(TO) || goto fail_open2 if $closeto; |
83 | close(FROM) || goto fail_open1 if $closefrom; |
84 | $\ = $recsep; |
85 | return 1; |
86 | |
87 | # All of these contortions try to preserve error messages... |
88 | fail_inner: |
89 | if ($closeto) { |
90 | $status = $!; |
91 | $! = 0; |
92 | close TO; |
93 | $! = $status unless $!; |
94 | } |
95 | fail_open2: |
96 | if ($closefrom) { |
97 | $status = $!; |
98 | $! = 0; |
99 | close FROM; |
100 | $! = $status unless $!; |
101 | } |
102 | fail_open1: |
103 | $\ = $recsep; |
104 | return 0; |
105 | } |
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106 | |
107 | |
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108 | *cp = \© |
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109 | # &syscopy is an XSUB under OS/2 |
110 | *syscopy = ($^O eq 'VMS' ? \&rmscopy : \©) unless $^O eq 'os2'; |
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111 | |
112 | 1; |
113 | |
114 | __END__ |
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115 | |
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116 | =head1 NAME |
117 | |
118 | File::Copy - Copy files or filehandles |
119 | |
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120 | =head1 SYNOPSIS |
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121 | |
122 | use File::Copy; |
123 | |
124 | copy("file1","file2"); |
125 | copy("Copy.pm",\*STDOUT);' |
126 | |
127 | use POSIX; |
128 | use File::Copy cp; |
129 | |
130 | $n=FileHandle->new("/dev/null","r"); |
131 | cp($n,"x");' |
132 | |
133 | =head1 DESCRIPTION |
134 | |
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135 | The File::Copy module provides a basic function C<copy> which takes two |
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136 | parameters: a file to copy from and a file to copy to. Either |
137 | argument may be a string, a FileHandle reference or a FileHandle |
138 | glob. Obviously, if the first argument is a filehandle of some |
139 | sort, it will be read from, and if it is a file I<name> it will |
140 | be opened for reading. Likewise, the second argument will be |
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141 | written to (and created if need be). Note that passing in |
142 | files as handles instead of names may lead to loss of information |
143 | on some operating systems; it is recommended that you use file |
144 | names whenever possible. |
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145 | |
146 | An optional third parameter can be used to specify the buffer |
147 | size used for copying. This is the number of bytes from the |
148 | first file, that wil be held in memory at any given time, before |
149 | being written to the second file. The default buffer size depends |
150 | upon the file, but will generally be the whole file (up to 2Mb), or |
151 | 1k for filehandles that do not reference files (eg. sockets). |
152 | |
153 | You may use the syntax C<use File::Copy "cp"> to get at the |
154 | "cp" alias for this function. The syntax is I<exactly> the same. |
155 | |
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156 | File::Copy also provides the C<syscopy> routine, which copies the |
157 | file specified in the first parameter to the file specified in the |
158 | second parameter, preserving OS-specific attributes and file |
159 | structure. For Unix systems, this is equivalent to the simple |
160 | C<copy> routine. For VMS systems, this calls the C<rmscopy> |
161 | routine (see below). For OS/2 systems, this calls the C<syscopy> |
162 | XSUB directly. |
163 | |
164 | =head2 Special behavior under VMS |
165 | |
166 | If the second argument to C<copy> is not a file handle for an |
167 | already opened file, then C<copy> will perform an RMS copy of |
168 | the input file to a new output file, in order to preserve file |
169 | attributes, indexed file structure, I<etc.> The buffer size |
170 | parameter is ignored. If the second argument to C<copy> is a |
171 | Perl handle to an opened file, then data is copied using Perl |
172 | operators, and no effort is made to preserve file attributes |
173 | or record structure. |
174 | |
175 | The RMS copy routine may also be called directly under VMS |
176 | as C<File::Copy::rmscopy> (or C<File::Copy::syscopy>, which |
177 | is just an alias for this routine). |
178 | |
179 | =item rmscopy($from,$to[,$date_flag]) |
180 | |
181 | The first and second arguments may be strings, typeglobs, or |
182 | typeglob references; they are used in all cases to obtain the |
183 | I<filespec> of the input and output files, respectively. The |
184 | name and type of the input file are used as defaults for the |
185 | output file, if necessary. |
186 | |
187 | A new version of the output file is always created, which |
188 | inherits the structure and RMS attributes of the input file, |
189 | except for owner and protections (and possibly timestamps; |
190 | see below). All data from the input file is copied to the |
191 | output file; if either of the first two parameters to C<rmscopy> |
192 | is a file handle, its position is unchanged. (Note that this |
193 | means a file handle pointing to the output file will be |
194 | associated with an old version of that file after C<rmscopy> |
195 | returns, not the newly created version.) |
196 | |
197 | The third parameter is an integer flag, which tells C<rmscopy> |
198 | how to handle timestamps. If it is < 0, none of the input file's |
199 | timestamps are propagated to the output file. If it is > 0, then |
200 | it is interpreted as a bitmask: if bit 0 (the LSB) is set, then |
201 | timestamps other than the revision date are propagated; if bit 1 |
202 | is set, the revision date is propagated. If the third parameter |
203 | to C<rmscopy> is 0, then it behaves much like the DCL COPY command: |
204 | if the name or type of the output file was explicitly specified, |
205 | then no timestamps are propagated, but if they were taken implicitly |
206 | from the input filespec, then all timestamps other than the |
207 | revision date are propagated. If this parameter is not supplied, |
208 | it defaults to 0. |
209 | |
210 | Like C<copy>, C<rmscopy> returns 1 on success. If an error occurs, |
211 | it sets C<$!>, deletes the output file, and returns 0. |
212 | |
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213 | =head1 RETURN |
214 | |
215 | Returns 1 on success, 0 on failure. $! will be set if an error was |
216 | encountered. |
217 | |
218 | =head1 AUTHOR |
219 | |
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220 | File::Copy was written by Aaron Sherman I<E<lt>ajs@ajs.comE<gt>> in 1995. |
221 | The VMS-specific code was added by Charles Bailey |
222 | I<E<lt>bailey@genetics.upenn.eduE<gt>> in March 1996. |
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223 | |
224 | =cut |