eedb/share/include/tao/json/external/pegtl/internal/file_opener.hh
2017-02-26 09:32:45 +01:00

66 lines
1.6 KiB
C++

// Copyright (c) 2014-2016 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/ColinH/PEGTL/
#ifndef TAO_CPP_PEGTL_INTERNAL_FILE_OPENER_HH
#define TAO_CPP_PEGTL_INTERNAL_FILE_OPENER_HH
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <utility>
#include "../input_error.hh"
namespace tao_json_pegtl
{
namespace internal
{
struct file_opener
{
explicit
file_opener( std::string filename )
: m_source( std::move( filename ) ),
m_fd( open() )
{ }
~file_opener()
{
::close( m_fd );
}
file_opener( const file_opener & ) = delete;
void operator= ( const file_opener & ) = delete;
std::size_t size() const
{
struct stat st;
errno = 0;
if ( ::fstat( m_fd, & st ) < 0 ) {
TAO_CPP_PEGTL_THROW_INPUT_ERROR( "unable to fstat() file " << m_source << " descriptor " << m_fd );
}
return std::size_t( st.st_size );
}
const std::string m_source;
const int m_fd;
private:
int open() const
{
errno = 0;
const int fd = ::open( m_source.c_str(), O_RDONLY );
if ( fd >= 0 ) {
return fd;
}
TAO_CPP_PEGTL_THROW_INPUT_ERROR( "unable to open() file " << m_source << " for reading" );
}
};
} // namespace internal
} // namespace tao_json_pegtl
#endif