platforms, because now any C<\015>'s (C<\cM>'s) are stripped out
(and there was much rejoicing).
+An important thing to remember is that functions that return data
+should translate newlines when appropriate. Often one line of code
+will suffice:
+
+ $data =~ s/\015?\012/\n/g;
+ return $data;
+
=head2 Numbers endianness and Width
binary, or consider using modules like C<Data::Dumper> (included in
the standard distribution as of Perl 5.005) and C<Storable>.
-=head2 Files
+=head2 Files and Filesystems
Most platforms these days structure files in a hierarchical fashion.
So, it is reasonably safe to assume that any platform supports the
S<Mac OS> uses C<:> as a path separator instead of C</>.
+The filesystem may support neither hard links (C<link()>) nor
+symbolic links (C<symlink()>, C<readlink()>, C<lstat()>).
+
+The filesystem may not support neither access timestamp nor change
+timestamp (meaning that about the only portable timestamp is the
+modification timestamp), or one second granularity of any timestamps
+(e.g. the FAT filesystem limits the time granularity to two seconds).
+
VOS perl can emulate Unix filenames with C</> as path separator. The
native pathname characters greater-than, less-than, number-sign, and
percent-sign are always accepted.
make it so the resulting files have a unique (case-insensitively)
first 8 characters.
-Don't assume C<E<gt>> won't be the first character of a filename. Always
-use C<E<lt>> explicitly to open a file for reading.
+There certainly can be whitespace in filenames. Many systems (DOS,
+VMS) cannot have more than one C<"."> in their filenames.
+
+Don't assume C<E<gt>> won't be the first character of a filename.
+Always use C<E<lt>> explicitly to open a file for reading.
open(FILE, "<$existing_file") or die $!;
=item The djgpp environment for DOS, C<http://www.delorie.com/djgpp/>
=item The EMX environment for DOS, OS/2, etc. C<emx@iaehv.nl>,
-C<http://www.juge.com/bbs/Hobb.19.html>
+C<http://www.leo.org/pub/comp/os/os2/leo/gnu/emx+gcc/index.html> or
+C<ftp://hobbes.nmsu.edu/pub/os2/dev/emx>
=item Build instructions for Win32, L<perlwin32>.
contain a slash character cannot be processed. Such files must be
renamed before they can be processed by Perl.
-The following C functions are unimplemented on VOS, any any attempt by
+The following C functions are unimplemented on VOS, and any attempt by
Perl to use them will result in a fatal error message and an immediate
-exit from Perl: dup, do_aspawn, do_spawn, execlp, execl, execvp, fork,
-waitpid. Once these functions become available in the VOS POSIX.1
-implementation, you can either recompile and rebind Perl, or you can
-download a newer port from ftp.stratus.com.
+exit from Perl: dup, do_aspawn, do_spawn, fork, waitpid. Once these
+functions become available in the VOS POSIX.1 implementation, you can
+either recompile and rebind Perl, or you can download a newer port from
+ftp.stratus.com.
The value of C<$^O> on VOS is "VOS". To determine the architecture that
you are running on without resorting to loading all of C<%Config> you
Not implemented. (S<Mac OS>, Win32, VMS, S<RISC OS>)
+Link count not updated because hard links are not quite that hard
+(They are sort of half-way between hard and soft links). (AmigaOS)
+
=item lstat FILEHANDLE
=item lstat EXPR
Not implemented. (S<Mac OS>)
+Very limited functionality. (MiNT)
+
=item readlink EXPR
=item readlink
I<scalar> will call the native command line direct and no such emulation
of a child Unix program will exists. Mileage B<will> vary. (S<RISC OS>)
+Far from being POSIX compliant. Because there may be no underlying
+/bin/sh tries to work around the problem by forking and execing the
+first token in its argument string. Handles basic redirection
+("E<lt>" or "E<gt>") on its own behalf. (MiNT)
+
=item times
Only the first entry returned is nonzero. (S<Mac OS>)
Returns undef where unavailable, as of version 5.005.
+C<umask()> works but the correct permissions are only set when the file
+is finally close()d. (AmigaOS)
+
=item utime LIST
Only the modification time is updated. (S<Mac OS>, VMS, S<RISC OS>)
=over 4
+=item v1.39, 11 February, 1999
+
+Changes from Jarkko and EMX URL fixes Michael Schwern. Additional
+note about newlines added.
+
+=item v1.38, 31 December 1998
+
+More changes from Jarkko.
+
=item v1.37, 19 December 1998
More minor changes. Merge two separate version 1.35 documents.
Hugo van der Sanden E<lt>hv@crypt0.demon.co.ukE<gt>,
Gurusamy Sarathy E<lt>gsar@umich.eduE<gt>,
Paul J. Schinder E<lt>schinder@pobox.comE<gt>,
+Michael G Schwern E<lt>schwern@pobox.comE<gt>,
Dan Sugalski E<lt>sugalskd@ous.eduE<gt>,
Nathan Torkington E<lt>gnat@frii.comE<gt>.
=head1 VERSION
-Version 1.37, last modified 19 December 1998
-
+Version 1.39, last modified 11 February 1999
projects / p5sagit/p5-mst-13.2.git / blobdiff