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1 | # Perl hooks into the routines in vms.c for interconversion |
2 | # of VMS and Unix file specification syntax. |
3 | # |
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4 | # Version: see $VERSION below |
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5 | # Author: Charles Bailey bailey@newman.upenn.edu |
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6 | # Revised: 08-Mar-1995 |
7 | |
8 | =head1 NAME |
9 | |
10 | VMS::Filespec - convert between VMS and Unix file specification syntax |
11 | |
12 | =head1 SYNOPSIS |
13 | |
14 | use VMS::Filespec; |
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15 | $fullspec = rmsexpand('[.VMS]file.specification'[, 'default:[file.spec]']); |
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16 | $vmsspec = vmsify('/my/Unix/file/specification'); |
17 | $unixspec = unixify('my:[VMS]file.specification'); |
18 | $path = pathify('my:[VMS.or.Unix.directory]specification.dir'); |
19 | $dirfile = fileify('my:[VMS.or.Unix.directory.specification]'); |
20 | $vmsdir = vmspath('my/VMS/or/Unix/directory/specification.dir'); |
21 | $unixdir = unixpath('my:[VMS.or.Unix.directory]specification.dir'); |
22 | candelete('my:[VMS.or.Unix]file.specification'); |
23 | |
24 | =head1 DESCRIPTION |
25 | |
26 | This package provides routines to simplify conversion between VMS and |
27 | Unix syntax when processing file specifications. This is useful when |
28 | porting scripts designed to run under either OS, and also allows you |
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29 | to take advantage of conveniences provided by either syntax (I<e.g.> |
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30 | ability to easily concatenate Unix-style specifications). In |
31 | addition, it provides an additional file test routine, C<candelete>, |
32 | which determines whether you have delete access to a file. |
33 | |
34 | If you're running under VMS, the routines in this package are special, |
35 | in that they're automatically made available to any Perl script, |
36 | whether you're running F<miniperl> or the full F<perl>. The C<use |
37 | VMS::Filespec> or C<require VMS::Filespec; import VMS::Filespec ...> |
38 | statement can be used to import the function names into the current |
39 | package, but they're always available if you use the fully qualified |
40 | name, whether or not you've mentioned the F<.pm> file in your script. |
41 | If you're running under another OS and have installed this package, it |
42 | behaves like a normal Perl extension (in fact, you're using Perl |
43 | substitutes to emulate the necessary VMS system calls). |
44 | |
45 | Each of these routines accepts a file specification in either VMS or |
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46 | Unix syntax, and returns the converted file specification, or C<undef> |
47 | if an error occurs. The conversions are, for the most part, simply |
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48 | string manipulations; the routines do not check the details of syntax |
49 | (e.g. that only legal characters are used). There is one exception: |
50 | when running under VMS, conversions from VMS syntax use the $PARSE |
51 | service to expand specifications, so illegal syntax, or a relative |
52 | directory specification which extends above the tope of the current |
53 | directory path (e.g [---.foo] when in dev:[dir.sub]) will cause |
54 | errors. In general, any legal file specification will be converted |
55 | properly, but garbage input tends to produce garbage output. |
56 | |
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57 | Each of these routines is prototyped as taking a single scalar |
58 | argument, so you can use them as unary operators in complex |
59 | expressions (as long as you don't use the C<&> form of |
60 | subroutine call, which bypasses prototype checking). |
61 | |
62 | |
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63 | The routines provided are: |
64 | |
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65 | =head2 rmsexpand |
66 | |
67 | Uses the RMS $PARSE and $SEARCH services to expand the input |
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68 | specification to its fully qualified form, except that a null type |
69 | or version is not added unless it was present in either the original |
70 | file specification or the default specification passed to C<rmsexpand>. |
71 | (If the file does not exist, the input specification is expanded as much |
72 | as possible.) If an error occurs, returns C<undef> and sets C<$!> |
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73 | and C<$^E>. |
74 | |
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75 | =head2 vmsify |
76 | |
77 | Converts a file specification to VMS syntax. |
78 | |
79 | =head2 unixify |
80 | |
81 | Converts a file specification to Unix syntax. |
82 | |
83 | =head2 pathify |
84 | |
85 | Converts a directory specification to a path - that is, a string you |
86 | can prepend to a file name to form a valid file specification. If the |
87 | input file specification uses VMS syntax, the returned path does, too; |
88 | likewise for Unix syntax (Unix paths are guaranteed to end with '/'). |
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89 | Note that this routine will insist that the input be a legal directory |
90 | file specification; the file type and version, if specified, must be |
91 | F<.DIR;1>. For compatibility with Unix usage, the type and version |
92 | may also be omitted. |
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93 | |
94 | =head2 fileify |
95 | |
96 | Converts a directory specification to the file specification of the |
97 | directory file - that is, a string you can pass to functions like |
98 | C<stat> or C<rmdir> to manipulate the directory file. If the |
99 | input directory specification uses VMS syntax, the returned file |
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100 | specification does, too; likewise for Unix syntax. As with |
101 | C<pathify>, the input file specification must have a type and |
102 | version of F<.DIR;1>, or the type and version must be omitted. |
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103 | |
104 | =head2 vmspath |
105 | |
106 | Acts like C<pathify>, but insures the returned path uses VMS syntax. |
107 | |
108 | =head2 unixpath |
109 | |
110 | Acts like C<pathify>, but insures the returned path uses Unix syntax. |
111 | |
112 | =head2 candelete |
113 | |
114 | Determines whether you have delete access to a file. If you do, C<candelete> |
115 | returns true. If you don't, or its argument isn't a legal file specification, |
116 | C<candelete> returns FALSE. Unlike other file tests, the argument to |
117 | C<candelete> must be a file name (not a FileHandle), and, since it's an XSUB, |
118 | it's a list operator, so you need to be careful about parentheses. Both of |
119 | these restrictions may be removed in the future if the functionality of |
120 | C<candelete> becomes part of the Perl core. |
121 | |
122 | =head1 REVISION |
123 | |
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124 | This document was last revised 22-Feb-1996, for Perl 5.002. |
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125 | |
126 | =cut |
127 | |
128 | package VMS::Filespec; |
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129 | require 5.002; |
130 | |
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131 | our $VERSION = '1.1'; |
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132 | |
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133 | # If you want to use this package on a non-VMS system, |
134 | # uncomment the following line. |
135 | # use AutoLoader; |
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136 | require Exporter; |
137 | |
138 | @ISA = qw( Exporter ); |
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139 | @EXPORT = qw( &vmsify &unixify &pathify &fileify |
140 | &vmspath &unixpath &candelete &rmsexpand ); |
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141 | |
142 | 1; |
143 | |
144 | |
145 | __END__ |
146 | |
147 | |
148 | # The autosplit routines here are provided for use by non-VMS systems |
149 | # They are not guaranteed to function identically to the XSUBs of the |
150 | # same name, since they do not have access to the RMS system routine |
151 | # sys$parse() (in particular, no real provision is made for handling |
152 | # of complex DECnet node specifications). However, these routines |
153 | # should be adequate for most purposes. |
154 | |
155 | # A sort-of sys$parse() replacement |
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156 | sub rmsexpand ($;$) { |
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157 | my($fspec,$defaults) = @_; |
158 | if (!$fspec) { return undef } |
159 | my($node,$dev,$dir,$name,$type,$ver,$dnode,$ddev,$ddir,$dname,$dtype,$dver); |
160 | |
161 | $fspec =~ s/:$//; |
162 | $defaults = [] unless $defaults; |
163 | $defaults = [ $defaults ] unless ref($defaults) && ref($defaults) eq 'ARRAY'; |
164 | |
165 | while ($fspec !~ m#[:>\]]# && $ENV{$fspec}) { $fspec = $ENV{$fspec} } |
166 | |
167 | if ($fspec =~ /:/) { |
168 | my($dev,$devtrn,$base); |
169 | ($dev,$base) = split(/:/,$fspec); |
170 | $devtrn = $dev; |
171 | while ($devtrn = $ENV{$devtrn}) { |
172 | if ($devtrn =~ /(.)([:>\]])$/) { |
173 | $dev .= ':', last if $1 eq '.'; |
174 | $dev = $devtrn, last; |
175 | } |
176 | } |
177 | $fspec = $dev . $base; |
178 | } |
179 | |
180 | ($node,$dev,$dir,$name,$type,$ver) = $fspec =~ |
181 | /([^:]*::)?([^:]*:)?([^>\]]*[>\]])?([^.;]*)(\.?[^.;]*)([.;]?\d*)/; |
182 | foreach ((@$defaults,$ENV{'DEFAULT'})) { |
183 | last if $node && $ver && $type && $dev && $dir && $name; |
184 | ($dnode,$ddev,$ddir,$dname,$dtype,$dver) = |
185 | /([^:]*::)?([^:]*:)?([^>\]]*[>\]])?([^.;]*)(\.?[^.;]*)([.;]?\d*)/; |
186 | $node = $dnode if $dnode && !$node; |
187 | $dev = $ddev if $ddev && !$dev; |
188 | $dir = $ddir if $ddir && !$dir; |
189 | $name = $dname if $dname && !$name; |
190 | $type = $dtype if $dtype && !$type; |
191 | $ver = $dver if $dver && !$ver; |
192 | } |
193 | # do this the long way to keep -w happy |
194 | $fspec = ''; |
195 | $fspec .= $node if $node; |
196 | $fspec .= $dev if $dev; |
197 | $fspec .= $dir if $dir; |
198 | $fspec .= $name if $name; |
199 | $fspec .= $type if $type; |
200 | $fspec .= $ver if $ver; |
201 | $fspec; |
202 | } |
203 | |
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204 | sub vmsify ($) { |
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205 | my($fspec) = @_; |
206 | my($hasdev,$dev,$defdirs,$dir,$base,@dirs,@realdirs); |
207 | |
208 | if ($fspec =~ m#^\.(\.?)/?$#) { return $1 ? '[-]' : '[]'; } |
209 | return $fspec if $fspec !~ m#/#; |
210 | ($hasdev,$dir,$base) = $fspec =~ m#(/?)(.*)/(.*)#; |
211 | @dirs = split(m#/#,$dir); |
212 | if ($base eq '.') { $base = ''; } |
213 | elsif ($base eq '..') { |
214 | push @dirs,$base; |
215 | $base = ''; |
216 | } |
217 | foreach (@dirs) { |
218 | next unless $_; # protect against // in input |
219 | next if $_ eq '.'; |
220 | if ($_ eq '..') { |
221 | if (@realdirs && $realdirs[$#realdirs] ne '-') { pop @realdirs } |
222 | else { push @realdirs, '-' } |
223 | } |
224 | else { push @realdirs, $_; } |
225 | } |
226 | if ($hasdev) { |
227 | $dev = shift @realdirs; |
228 | @realdirs = ('000000') unless @realdirs; |
229 | $base = '' unless $base; # keep -w happy |
230 | $dev . ':[' . join('.',@realdirs) . "]$base"; |
231 | } |
232 | else { |
233 | '[' . join('',map($_ eq '-' ? $_ : ".$_",@realdirs)) . "]$base"; |
234 | } |
235 | } |
236 | |
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237 | sub unixify ($) { |
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238 | my($fspec) = @_; |
239 | |
240 | return $fspec if $fspec !~ m#[:>\]]#; |
241 | return '.' if ($fspec eq '[]' || $fspec eq '<>'); |
242 | if ($fspec =~ m#^[<\[](\.|-+)(.*)# ) { |
243 | $fspec = ($1 eq '.' ? '' : "$1.") . $2; |
244 | my($dir,$base) = split(/[\]>]/,$fspec); |
245 | my(@dirs) = grep($_,split(m#\.#,$dir)); |
246 | if ($dirs[0] =~ /^-/) { |
247 | my($steps) = shift @dirs; |
248 | for (1..length($steps)) { unshift @dirs, '..'; } |
249 | } |
250 | join('/',@dirs) . "/$base"; |
251 | } |
252 | else { |
253 | $fspec = rmsexpand($fspec,'_N_O_T_:[_R_E_A_L_]'); |
254 | $fspec =~ s/.*_N_O_T_:(?:\[_R_E_A_L_\])?//; |
255 | my($dev,$dir,$base) = $fspec =~ m#([^:<\[]*):?[<\[](.*)[>\]](.*)#; |
256 | my(@dirs) = split(m#\.#,$dir); |
257 | if ($dirs[0] && $dirs[0] =~ /^-/) { |
258 | my($steps) = shift @dirs; |
259 | for (1..length($steps)) { unshift @dirs, '..'; } |
260 | } |
261 | "/$dev/" . join('/',@dirs) . "/$base"; |
262 | } |
263 | } |
264 | |
265 | |
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266 | sub fileify ($) { |
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267 | my($path) = @_; |
268 | |
269 | if (!$path) { return undef } |
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270 | if ($path eq '/') { return 'sys$disk:[000000]'; } |
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271 | if ($path =~ /(.+)\.([^:>\]]*)$/) { |
272 | $path = $1; |
273 | if ($2 !~ /^dir(?:;1)?$/i) { return undef } |
274 | } |
275 | |
276 | if ($path !~ m#[/>\]]#) { |
277 | $path =~ s/:$//; |
278 | while ($ENV{$path}) { |
279 | ($path = $ENV{$path}) =~ s/:$//; |
280 | last if $path =~ m#[/>\]]#; |
281 | } |
282 | } |
283 | if ($path =~ m#[>\]]#) { |
284 | my($dir,$sep,$base) = $path =~ /(.*)([>\]])(.*)/; |
285 | $sep =~ tr/<[/>]/; |
286 | if ($base) { |
287 | "$dir$sep$base.dir;1"; |
288 | } |
289 | else { |
290 | if ($dir !~ /\./) { $dir =~ s/([<\[])/${1}000000./; } |
291 | $dir =~ s#\.(\w+)$#$sep$1#; |
292 | $dir =~ s/^.$sep//; |
293 | "$dir.dir;1"; |
294 | } |
295 | } |
296 | else { |
297 | $path =~ s#/$##; |
298 | "$path.dir;1"; |
299 | } |
300 | } |
301 | |
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302 | sub pathify ($) { |
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303 | my($fspec) = @_; |
304 | |
305 | if (!$fspec) { return undef } |
306 | if ($fspec =~ m#[/>\]]$#) { return $fspec; } |
307 | if ($fspec =~ m#(.+)\.([^/>\]]*)$# && $2 && $2 ne '.') { |
308 | $fspec = $1; |
309 | if ($2 !~ /^dir(?:;1)?$/i) { return undef } |
310 | } |
311 | |
312 | if ($fspec !~ m#[/>\]]#) { |
313 | $fspec =~ s/:$//; |
314 | while ($ENV{$fspec}) { |
315 | if ($ENV{$fspec} =~ m#[>\]]$#) { return $ENV{$fspec} } |
316 | else { $fspec = $ENV{$fspec} =~ s/:$// } |
317 | } |
318 | } |
319 | |
320 | if ($fspec !~ m#[>\]]#) { "$fspec/"; } |
321 | else { |
322 | if ($fspec =~ /([^>\]]+)([>\]])(.+)/) { "$1.$3$2"; } |
323 | else { $fspec; } |
324 | } |
325 | } |
326 | |
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327 | sub vmspath ($) { |
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328 | pathify(vmsify($_[0])); |
329 | } |
330 | |
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331 | sub unixpath ($) { |
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332 | pathify(unixify($_[0])); |
333 | } |
334 | |
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335 | sub candelete ($) { |
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336 | my($fspec) = @_; |
337 | my($parent); |
338 | |
339 | return '' unless -w $fspec; |
340 | $fspec =~ s#/$##; |
341 | if ($fspec =~ m#/#) { |
342 | ($parent = $fspec) =~ s#/[^/]+$#; |
343 | return (-w $parent); |
344 | } |
345 | elsif ($parent = fileify($fspec)) { # fileify() here to expand lnms |
346 | $parent =~ s/[>\]][^>\]]+//; |
347 | return (-w fileify($parent)); |
348 | } |
349 | else { return (-w '[-]'); } |
350 | } |