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-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/stdio/scanf.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
19#ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
20#define SCANF_STDIN LIBC_NAMESPACE::stdin
21#else // LIBC_COPT_STDIO_USE_SYSTEM_FILE
22#define SCANF_STDIN ::stdin
23#endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
24
25namespace LIBC_NAMESPACE_DECL {
26
27LLVM_LIBC_FUNCTION(int, scanf, (const char *__restrict format, ...)) {
28 va_list vlist;
29 va_start(vlist, format);
30 internal::ArgList args(vlist); // This holder class allows for easier copying
31 // and pointer semantics, as well as handling
32 // destruction automatically.
33 va_end(vlist);
34 int ret_val = scanf_core::vfscanf_internal(
35 reinterpret_cast<::FILE *>(SCANF_STDIN), format, args);
36 // This is done to avoid including stdio.h in the internals. On most systems
37 // EOF is -1, so this will be transformed into just "return ret_val".
38 return (ret_val == -1) ? EOF : ret_val;
39}
40
41} // namespace LIBC_NAMESPACE_DECL
42

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source code of libc/src/stdio/generic/scanf.cpp