libc/src/stdio/generic/putc.cpp

   1 //===-- Implementation of putc --------------------------------------------===//
   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/putc.h"
  10 #include "src/__support/File/file.h"
  11
  12 #include "hdr/types/FILE.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15 #include <stddef.h>
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LLVM_LIBC_FUNCTION(int, putc, (int c, ::FILE *stream)) {
  20   unsigned char uc = static_cast<unsigned char>(c);
  21
  22   auto result = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->write(&uc, 1);
  23   if (result.has_error())
  24     libc_errno = result.error;
  25   size_t written = result.value;
  26
  27   if (1 != written) {
  28     // The stream should be in an error state in this case.
  29     return EOF;
  30   }
  31   return 0;
  32 }
  33
  34 } // namespace LIBC_NAMESPACE_DECL