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