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// Copyright 2022 The Fuchsia Authors
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT
#ifndef ZIRCON_KERNEL_LIB_LIBC_INCLUDE_MULTI_FILE_H_
#define ZIRCON_KERNEL_LIB_LIBC_INCLUDE_MULTI_FILE_H_
#include <stdio.h>
#include <ktl/array.h>
#include <ktl/forward.h>
#include <ktl/string_view.h>
#include <ktl/type_traits.h>
// MultiFile broadcasts Write calls across multiple FILE* pointers. Each
// pointer is ignored if it's null. MultiFile::Write always returns success,
// ignoring any failures or short writes from the underlying FILE objects.
template <size_t N>
class MultiFile : public FILE {
public:
using FileArray = ktl::array<FILE*, N>;
constexpr MultiFile() : FILE{this} {}
constexpr explicit MultiFile(const FileArray& files) : FILE{this}, files_(files) {}
constexpr MultiFile(const MultiFile& other) : MultiFile(other.files_) {}
FileArray& files() { return files_; }
const FileArray& files() const { return files_; }
int Write(ktl::string_view str) {
for (FILE* file : files_) {
if (file) {
file->Write(str);
}
}
return static_cast<int>(str.size());
}
private:
FileArray files_ = {};
};
template <size_t N>
MultiFile(const ktl::array<FILE*, N>&) -> MultiFile<N>;
#endif // ZIRCON_KERNEL_LIB_LIBC_INCLUDE_MULTI_FILE_H_
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