44 lines · cpp
1//===-- Implementation of asprintf -----------------------------*- 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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/stdio/asprintf.h"10#include "src/__support/CPP/limits.h"11#include "src/__support/arg_list.h"12#include "src/__support/libc_errno.h"13#include "src/__support/macros/config.h"14#include "src/stdio/printf_core/core_structs.h"15#include "src/stdio/printf_core/error_mapper.h"16#include "src/stdio/printf_core/vasprintf_internal.h"17 18namespace LIBC_NAMESPACE_DECL {19 20LLVM_LIBC_FUNCTION(int, asprintf,21 (char **__restrict buffer, const char *__restrict format,22 ...)) {23 va_list vlist;24 va_start(vlist, format);25 internal::ArgList args(vlist); // This holder class allows for easier copying26 // and pointer semantics, as well as handling27 // destruction automatically.28 va_end(vlist);29 auto ret_val = printf_core::vasprintf_internal(buffer, format, args);30 if (!ret_val.has_value()) {31 libc_errno = printf_core::internal_error_to_errno(ret_val.error());32 return -1;33 }34 if (ret_val.value() > static_cast<size_t>(cpp::numeric_limits<int>::max())) {35 libc_errno =36 printf_core::internal_error_to_errno(-printf_core::OVERFLOW_ERROR);37 return -1;38 }39 40 return static_cast<int>(ret_val.value());41}42 43} // namespace LIBC_NAMESPACE_DECL44