38 lines · cpp
1//===-- Implementation of scanf ---------------------------------*- 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/scanf.h"10 11#include "hdr/stdio_macros.h"12#include "src/__support/OSUtil/io.h"13#include "src/__support/arg_list.h"14#include "src/__support/macros/config.h"15#include "src/stdio/baremetal/scanf_internal.h"16#include "src/stdio/scanf_core/scanf_main.h"17 18#include <stdarg.h>19 20namespace LIBC_NAMESPACE_DECL {21 22LLVM_LIBC_FUNCTION(int, scanf, (const char *__restrict format, ...)) {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 30 scanf_core::StdinReader reader;31 int retval = scanf_core::scanf_main(&reader, format, args);32 // This is done to avoid including stdio.h in the internals. On most systems33 // EOF is -1, so this will be transformed into just "return retval".34 return (retval == -1) ? EOF : retval;35}36 37} // namespace LIBC_NAMESPACE_DECL38