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//===-- Implementation of printf for baremetal ------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/stdio/printf.h"
#include "src/__support/OSUtil/io.h"
#include "src/__support/arg_list.h"
#include "src/__support/macros/config.h"
#include "src/stdio/printf_core/core_structs.h"
#include "src/stdio/printf_core/printf_main.h"
#include "src/stdio/printf_core/writer.h"
#include <stdarg.h>
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
namespace {
LIBC_INLINE int stdout_write_hook(cpp::string_view new_str, void *) {
write_to_stdout(new_str);
return printf_core::WRITE_OK;
}
} // namespace
LLVM_LIBC_FUNCTION(int, printf, (const char *__restrict format, ...)) {
va_list vlist;
va_start(vlist, format);
internal::ArgList args(vlist); // This holder class allows for easier copying
// and pointer semantics, as well as handling
// destruction automatically.
va_end(vlist);
static constexpr size_t BUFF_SIZE = 1024;
char buffer[BUFF_SIZE];
printf_core::WriteBuffer<printf_core::WriteMode::FLUSH_TO_STREAM> wb(
buffer, BUFF_SIZE, &stdout_write_hook, nullptr);
printf_core::Writer<printf_core::WriteMode::FLUSH_TO_STREAM> writer(wb);
int retval = printf_core::printf_main(&writer, format, args);
int flushval = wb.overflow_write("");
if (flushval != printf_core::WRITE_OK)
retval = flushval;
return retval;
}
} // namespace LIBC_NAMESPACE_DECL
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