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/* Common code for zcmp and zdiff
Copyright (C) 2010-2020 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 open_instream( const std::string & input_filename )
{
const int infd = open( input_filename.c_str(), O_RDONLY | O_BINARY );
if( infd < 0 )
show_file_error( input_filename.c_str(), "Can't open input file", errno );
return infd;
}
int open_other_instream( std::string & name )
{
const int eindex = extension_index( name );
if( eindex >= 0 && enabled_format( -1 ) )
{ // open uncompressed version
name.resize( name.size() - std::strlen( extension_from( eindex ) ) );
name += extension_to( eindex );
return open( name.c_str(), O_RDONLY | O_BINARY );
}
if( eindex < 0 ) // search compressed version
for( int i = 0; i < num_formats; ++i )
if( enabled_format( format_order[i] ) )
{
const std::string s( name + simple_extensions[format_order[i]] );
const int infd = open( s.c_str(), O_RDONLY | O_BINARY );
if( infd >= 0 ) { name = s; return infd; }
}
return -1;
}
void parse_format_types2( const std::string & arg, int format_types[2] )
{
const unsigned i = std::min( arg.find( ',' ), arg.size() );
if( i > 0 ) format_types[0] = parse_format_type( arg.substr( 0, i ) );
else format_types[0] = -1;
if( i + 1 < arg.size() ) format_types[1] =
parse_format_type( arg.substr( i + 1 ) );
else format_types[1] = -1;
}
bool check_identical( const char * const name1, const char * const name2 )
{
if( std::strcmp( name1, name2 ) == 0 ) return true;
struct stat stat1, stat2;
if( stat( name1, &stat1 ) || stat( name2, &stat2 ) ) return false;
return ( stat1.st_ino == stat2.st_ino && stat1.st_dev == stat2.st_dev );
}
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