xref: /llvm-project/libc/src/stdio/generic/fgetc.cpp (revision 5aed6d67e3f051262c67e3295476bf13cfc099c4)
1 //===-- Implementation of fgetc -------------------------------------------===//
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/fgetc.h"
10 #include "src/__support/File/file.h"
11 
12 #include "hdr/types/FILE.h"
13 #include "src/errno/libc_errno.h"
14 #include <stddef.h>
15 
16 namespace LIBC_NAMESPACE {
17 
18 LLVM_LIBC_FUNCTION(int, fgetc, (::FILE * stream)) {
19   unsigned char c;
20   auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->read(&c, 1);
21   size_t r = result.value;
22   if (result.has_error())
23     libc_errno = result.error;
24 
25   if (r != 1)
26     return EOF;
27   return c;
28 }
29 
30 } // namespace LIBC_NAMESPACE
31