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Contents
// Copyright (c) 2014-2020 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAO_JSON_PEGTL_INTERNAL_FILE_OPENER_HPP
#define TAO_JSON_PEGTL_INTERNAL_FILE_OPENER_HPP
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <system_error>
#include <utility>
#include "../config.hpp"
namespace TAO_JSON_PEGTL_NAMESPACE::internal
{
struct file_opener
{
explicit file_opener( const char* filename )
: m_source( filename ),
m_fd( open() )
{
}
file_opener( const file_opener& ) = delete;
file_opener( file_opener&& ) = delete;
~file_opener() noexcept
{
::close( m_fd );
}
void operator=( const file_opener& ) = delete;
void operator=( file_opener&& ) = delete;
[[nodiscard]] std::size_t size() const
{
struct stat st;
errno = 0;
if( ::fstat( m_fd, &st ) < 0 ) {
const auto ec = errno;
throw std::system_error( ec, std::system_category(), m_source );
}
return std::size_t( st.st_size );
}
const char* const m_source;
const int m_fd;
private:
[[nodiscard]] int open() const
{
errno = 0;
const int fd = ::open( m_source,
O_RDONLY
#if defined( O_CLOEXEC )
| O_CLOEXEC
#endif
);
if( fd >= 0 ) {
return fd;
}
const auto ec = errno;
throw std::system_error( ec, std::system_category(), m_source );
}
};
} // namespace TAO_JSON_PEGTL_NAMESPACE::internal
#endif
Version data entries
24 entries across 24 versions & 1 rubygems