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-exception
6//
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/stdio/scanf_core/vfscanf_internal.h"
14
15#include <stdarg.h>
16#include <stdio.h>
17
18namespace LIBC_NAMESPACE {
19
20LLVM_LIBC_FUNCTION(int, fscanf,
21 (::FILE *__restrict stream, 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 copying
26 // and pointer semantics, as well as handling
27 // destruction automatically.
28 va_end(vlist);
29 int ret_val = scanf_core::vfscanf_internal(stream, format, args);
30 // This is done to avoid including stdio.h in the internals. On most systems
31 // EOF is -1, so this will be transformed into just "return ret_val".
32 return (ret_val == -1) ? EOF : ret_val;
33}
34
35} // namespace LIBC_NAMESPACE
36

source code of libc/src/stdio/fscanf.cpp