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 | |
25 | namespace LIBC_NAMESPACE_DECL { |
26 | |
27 | LLVM_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 | |