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//===-- Implementation of vprintf -------------------------------*- 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/vprintf.h"
#include "src/__support/CPP/limits.h"
#include "src/__support/OSUtil/io.h"
#include "src/__support/arg_list.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/stdio/printf_core/core_structs.h"
#include "src/stdio/printf_core/error_mapper.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, vprintf,
(const char *__restrict format, va_list vlist)) {
internal::ArgList args(vlist); // This holder class allows for easier copying
// and pointer semantics, as well as handling
// destruction automatically.
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);
auto retval = printf_core::printf_main(&writer, format, args);
if (!retval.has_value()) {
libc_errno = printf_core::internal_error_to_errno(retval.error());
return -1;
}
int flushval = wb.overflow_write("");
if (flushval != printf_core::WRITE_OK) {
libc_errno = printf_core::internal_error_to_errno(-flushval);
return -1;
}
if (retval.value() > static_cast<size_t>(cpp::numeric_limits<int>::max())) {
libc_errno =
printf_core::internal_error_to_errno(-printf_core::OVERFLOW_ERROR);
return -1;
}
return static_cast<int>(retval.value());
}
} // namespace LIBC_NAMESPACE_DECL
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