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/* Zutils - Utilities dealing with compressed files
Copyright (C) 2009-2024 Antonio Diaz Diaz.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Return true if full_name is a regular file with an enabled extension
or (a link to) a directory. */
bool test_full_name( const std::string & full_name, const struct stat * stp,
const bool follow )
{
struct stat st, st2;
if( follow && stat( full_name.c_str(), &st ) != 0 ) return false;
if( !follow && lstat( full_name.c_str(), &st ) != 0 ) return false;
if( S_ISREG( st.st_mode ) ) // regular file
return enabled_format( extension_format( extension_index( full_name ) ) );
if( !S_ISDIR( st.st_mode ) ) return false;
std::string prev_dir( full_name );
bool loop = ( stp && st.st_ino == stp->st_ino && st.st_dev == stp->st_dev );
if( !loop )
for( unsigned i = prev_dir.size(); i > 1; )
{
while( i > 0 && prev_dir[i-1] != '/' ) --i;
if( i == 0 ) break;
if( i > 1 ) --i; // remove trailing slash except at root dir
prev_dir.resize( i );
if( stat( prev_dir.c_str(), &st2 ) != 0 || !S_ISDIR( st2.st_mode ) ||
( st.st_ino == st2.st_ino && st.st_dev == st2.st_dev ) )
{ loop = true; break; }
}
if( loop ) // full_name already visited or above tree
show_file_error( full_name.c_str(), "warning: recursive directory loop." );
return !loop; // (link to) directory
}
/* Return in input_filename the next file name, or "." for stdin.
("." was chosen instead of "-" because "." is not a valid file name).
Set 'error' to true if a directory fails to open. */
bool next_filename( std::list< std::string > & filenames,
std::string & input_filename, bool & error,
const int recursive, const bool ignore_stdin = false,
const bool no_messages = false )
{
while( !filenames.empty() )
{
input_filename = filenames.front();
filenames.pop_front();
if( input_filename == "-" )
{
if( ignore_stdin ) continue;
input_filename = "."; return true;
}
struct stat st;
if( stat( input_filename.c_str(), &st ) == 0 && S_ISDIR( st.st_mode ) )
{
if( recursive )
{
DIR * const dirp = opendir( input_filename.c_str() );
if( !dirp )
{
if( !no_messages )
show_file_error( input_filename.c_str(), "Can't open directory", errno );
error = true; continue;
}
for( unsigned i = input_filename.size();
i > 1 && input_filename[i-1] == '/'; --i )
input_filename.resize( i - 1 ); // remove trailing slashes
struct stat stdot, *stdotp = 0;
if( input_filename[0] != '/' ) // relative file name
{
if( input_filename == "." ) input_filename.clear();
if( stat( ".", &stdot ) == 0 && S_ISDIR( stdot.st_mode ) )
stdotp = &stdot;
}
if( input_filename.size() && input_filename != "/" )
input_filename += '/';
std::list< std::string > tmp_list;
while( true )
{
const struct dirent * const entryp = readdir( dirp );
if( !entryp ) { closedir( dirp ); break; }
const std::string tmp_name( entryp->d_name );
if( tmp_name == "." || tmp_name == ".." ) continue;
const std::string full_name( input_filename + tmp_name );
if( test_full_name( full_name, stdotp, recursive == 2 ) )
tmp_list.push_back( full_name );
}
filenames.splice( filenames.begin(), tmp_list );
}
continue;
}
return true;
}
input_filename.clear();
return false;
}
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