libcruft-util/io.hpp

148 lines
4.1 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2010-2014 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_IO_HPP
#define __UTIL_IO_HPP
#include "platform.hpp"
#include "posix/fd.hpp"
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <experimental/filesystem>
#include <vector>
#include <streambuf>
#ifdef PLATFORM_WIN32
#include "win32/windows.hpp"
#else
#define O_BINARY 0
#endif
namespace cruft {
//-------------------------------------------------------------------------
/// Reads an entire file into memory.
template <typename T = std::byte>
std::vector<T> slurp (const std::experimental::filesystem::path&);
template <typename T = std::byte, typename A, typename B>
std::vector<T> slurp (cruft::view<A,B> path)
{
const std::experimental::filesystem::path src { path.begin (), path.end () };
return slurp<T> (src);
}
template <typename T = std::byte>
std::vector<T> slurp (FILE *);
///////////////////////////////////////////////////////////////////////////
/// writes all data from the provided view into the file-like-object
///
/// writing will continually iterate until the entire buffer has been
/// dispatched so as to avoid issues with partial writes. will block until
/// such time as the entire buffer has written.
///
/// an exception may be thrown in the event forward progress is impossible.
/// in this event the progress may not be reported to the caller. in the
/// future an exception member variable may expose the information.
template <
typename DstT,
typename IteratorA,
typename IteratorB
>
cruft::view<IteratorA,IteratorB>
write (DstT &&dst, const cruft::view<IteratorA, IteratorB> &src)
{
auto remain = src;
while (!remain.empty ())
remain = remain.consume (dst.write (remain));
return src;
}
///////////////////////////////////////////////////////////////////////////
class indenter : public std::streambuf {
protected:
std::streambuf* m_dest;
bool m_line_start;
std::string m_indent;
std::ostream* m_owner;
protected:
virtual int overflow (int ch) override;
public:
explicit indenter (std::streambuf* _dest, size_t _indent = 4);
explicit indenter (std::ostream& _dest, size_t _indent = 4);
virtual ~indenter ();
};
//-------------------------------------------------------------------------
// a wrapper type that implicitly indents a single value when passed to an
// ostream operator.
template <typename ValueT>
struct indented {
explicit indented (const ValueT &_data):
data (_data)
{ ; }
const ValueT &data;
};
//-------------------------------------------------------------------------
template <typename ValueT>
std::ostream&
operator<< (std::ostream &os, const cruft::indented<ValueT> &value)
{
cruft::indenter scoped_indent (os);
return os << value.data;
}
//-------------------------------------------------------------------------
class scoped_cwd {
public:
scoped_cwd ();
~scoped_cwd ();
protected:
std::string m_original;
};
//-------------------------------------------------------------------------
class path_error : public std::runtime_error {
public:
explicit path_error (const std::experimental::filesystem::path &path);
const std::experimental::filesystem::path& path (void) const noexcept;
private:
const std::experimental::filesystem::path m_path;
};
class stream_error : public std::exception {
public:
virtual const char* what (void) const noexcept
{ return "error on C stream"; }
};
}
#ifdef PLATFORM_WIN32
#include "io_win32.hpp"
#else
#include "io_posix.hpp"
#endif
#endif