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# kpathsea.pl -- search a file as Karl Berry likes to do it.
#
# Copyright (C) 1994 Ralph Schleicher (rs@purple.in-ulm.de)
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the Free
# Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# The comments are borrowed from `kpathsea.info'. ;-)
package KPathSearch;
# Is `require' local to a package? I don't know.
#
if (! $find_included)
{
do 'find.pl' || die "$0:find.pl: $!\n";
$find_included = 1;
}
sub main'kpathsearch
{
local ($var, $def, $file) = @_;
local (@path) = split (':', $ENV{$var} || $def, -1);
local (@def) = split (':', $def, -1);
local (@dir) = ();
local ($[) = 0;
while (@path)
{
$_ = shift @path;
# Extra colons expand to the compilation default.
#
unshift (@path, @def), next if $_ eq '';
# `~' and `~user' expand to home directories.
#
if (/^~/)
{
local ($slash, $name, $n, $p, $u, $g, $q, $c, $o, $home, $s);
$slash = index ($_, '/');
$slash = length if $slash < 0;
$name = substr ($_, 1, $slash - 1);
if ($name ne '')
{ ($n, $p, $u, $g, $q, $c, $o, $home, $s) = getpwnam ($name); }
else
{ ($n, $p, $u, $g, $q, $c, $o, $home, $s) = getpwuid ($<); }
$home = '.' if $home eq '';
$_ =~ s/^~$name/$home/;
}
# `$foo' and `${foo}' expand to environment values.
#
while (/\$(\w*|\{.*\})/)
{
$_ = join ('', $`, $ENV{$1} || '.', $');
}
# `a//' and `a//b' recursively expand to sub-directories.
#
if (/\/\//)
{
local ($base, @sub) = split ('//', $_, -1);
local ($term) = pop (@sub);
undef @directories;
&find ($base);
foreach $sub (@sub)
{
@directories = grep (m|^$base/(.*/)?$sub|, @directories);
}
@directories = grep (m|$term$|, @directories) if $term ne '';
push (@dir, @directories);
}
else
{
push (@dir, $_);
}
}
# See what we have to return.
#
return @dir if $file eq '';
if (wantarray)
{
return grep (-e ($_ = "$_/$file"), @dir);
}
foreach (@dir)
{
return $_ if -f ($_ = "$_/$file");
}
return undef;
}
sub wanted
{
push (@directories, $name) if (lstat ($_)) && -d _;
}
1;
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