1//===-- Implementation of printf for baremetal ------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/stdio/printf.h"
10#include "src/__support/OSUtil/io.h"
11#include "src/__support/arg_list.h"
12#include "src/__support/macros/config.h"
13#include "src/stdio/printf_core/core_structs.h"
14#include "src/stdio/printf_core/printf_main.h"
15#include "src/stdio/printf_core/writer.h"
16
17#include <stdarg.h>
18#include <stddef.h>
19
20namespace LIBC_NAMESPACE_DECL {
21
22namespace {
23
24LIBC_INLINE int raw_write_hook(cpp::string_view new_str, void *) {
25 write_to_stderr(new_str);
26 return printf_core::WRITE_OK;
27}
28
29} // namespace
30
31LLVM_LIBC_FUNCTION(int, printf, (const char *__restrict format, ...)) {
32 va_list vlist;
33 va_start(vlist, format);
34 internal::ArgList args(vlist); // This holder class allows for easier copying
35 // and pointer semantics, as well as handling
36 // destruction automatically.
37 va_end(vlist);
38 constexpr size_t BUFF_SIZE = 1024;
39 char buffer[BUFF_SIZE];
40
41 printf_core::WriteBuffer<printf_core::WriteMode::FLUSH_TO_STREAM> wb(
42 buffer, BUFF_SIZE, &raw_write_hook, nullptr);
43 printf_core::Writer<printf_core::WriteMode::FLUSH_TO_STREAM> writer(wb);
44
45 int retval = printf_core::printf_main(&writer, format, args);
46
47 int flushval = wb.overflow_write("");
48 if (flushval != printf_core::WRITE_OK)
49 retval = flushval;
50
51 return retval;
52}
53
54} // namespace LIBC_NAMESPACE_DECL
55

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source code of libc/src/stdio/baremetal/printf.cpp