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Diffstat (limited to 'recursive.cc')
| -rw-r--r-- | recursive.cc | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/recursive.cc b/recursive.cc new file mode 100644 index 0000000..21c33c9 --- /dev/null +++ b/recursive.cc @@ -0,0 +1,109 @@ +/* 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; + } |