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/* Common code for zcat and zgrep
Copyright (C) 2010-2024 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/>.
*/
#ifndef O_BINARY
#define O_BINARY 0
#endif
int simple_extension_index( const std::string & name )
{
for( int i = 0; i < num_formats; ++i )
{
const std::string ext( simple_extensions[i] );
if( name.size() > ext.size() &&
name.compare( name.size() - ext.size(), ext.size(), ext ) == 0 )
return i;
}
return -1;
}
int open_instream( std::string & input_filename, const bool search,
const bool no_messages = false )
{
int infd = open( input_filename.c_str(), O_RDONLY | O_BINARY );
if( infd < 0 )
{
const int saved_errno = errno;
if( search && simple_extension_index( input_filename ) < 0 )
{
for( int i = 0; i < num_formats; ++i )
if( enabled_format( format_order[i] ) )
{
const std::string name( input_filename +
simple_extensions[format_order[i]] );
infd = open( name.c_str(), O_RDONLY | O_BINARY );
if( infd >= 0 ) { input_filename = name; break; }
}
}
if( infd < 0 && !no_messages )
show_file_error( input_filename.c_str(), "Can't open input file",
saved_errno );
}
return infd;
}
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