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3d155d5695
* Use clang-tidy `misc-include-cleaner` for IWYU `#include` cleanup * Use `std::optional<size_t>` instead of `ssize_t` * Rename some functions in linkdefs.hpp * Fix header order
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
// SPDX-License-Identifier: MIT
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#ifndef RGBDS_FILE_HPP
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#define RGBDS_FILE_HPP
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#include <fcntl.h>
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#include <fstream>
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#include <ios>
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#include <iostream>
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#include <streambuf>
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#include <string>
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#include <variant>
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#include "helpers.hpp" // assume
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#include "platform.hpp"
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class File {
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std::variant<std::streambuf *, std::filebuf> _file;
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public:
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File() : _file(nullptr) {}
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// This should only be called once, and before doing any `->` operations.
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// Returns `nullptr` on error, and a non-null pointer otherwise.
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File *open(std::string const &path, std::ios_base::openmode mode) {
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if (path != "-") {
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return _file.emplace<std::filebuf>().open(path, mode) ? this : nullptr;
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} else if (mode & std::ios_base::in) {
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assume(!(mode & std::ios_base::out));
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_file.emplace<std::streambuf *>(std::cin.rdbuf());
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if (setmode(STDIN_FILENO, (mode & std::ios_base::binary) ? O_BINARY : O_TEXT) == -1) {
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return nullptr;
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}
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} else {
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assume(mode & std::ios_base::out);
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_file.emplace<std::streambuf *>(std::cout.rdbuf());
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}
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return this;
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}
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std::streambuf &operator*() {
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return std::holds_alternative<std::filebuf>(_file) ? std::get<std::filebuf>(_file)
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: *std::get<std::streambuf *>(_file);
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}
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std::streambuf const &operator*() const {
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// The non-`const` version does not perform any modifications, so it's okay.
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return **const_cast<File *>(this);
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}
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std::streambuf *operator->() { return &**this; }
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std::streambuf const *operator->() const {
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// See the `operator*` equivalent.
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return const_cast<File *>(this)->operator->();
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}
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char const *c_str(std::string const &path) const {
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return std::holds_alternative<std::filebuf>(_file) ? path.c_str()
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: std::get<std::streambuf *>(_file) == std::cin.rdbuf() ? "<stdin>"
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: "<stdout>";
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}
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};
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#endif // RGBDS_FILE_HPP
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