37 lines · cpp
1//===-- Implementation of fscanf --------------------------------*- 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/fscanf.h"10 11#include "src/__support/File/file.h"12#include "src/__support/arg_list.h"13#include "src/__support/macros/config.h"14#include "src/stdio/scanf_core/vfscanf_internal.h"15 16#include "hdr/types/FILE.h"17#include <stdarg.h>18 19namespace LIBC_NAMESPACE_DECL {20 21LLVM_LIBC_FUNCTION(int, fscanf,22 (::FILE *__restrict stream, const char *__restrict format,23 ...)) {24 va_list vlist;25 va_start(vlist, format);26 internal::ArgList args(vlist); // This holder class allows for easier copying27 // and pointer semantics, as well as handling28 // destruction automatically.29 va_end(vlist);30 int ret_val = scanf_core::vfscanf_internal(stream, format, args);31 // This is done to avoid including stdio.h in the internals. On most systems32 // EOF is -1, so this will be transformed into just "return ret_val".33 return (ret_val == -1) ? EOF : ret_val;34}35 36} // namespace LIBC_NAMESPACE_DECL37