1 //===-- Implementation of setbuf ------------------------------------------===// 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/setbuf.h" 10 #include "hdr/stdio_macros.h" 11 #include "src/__support/File/file.h" 12 #include "src/errno/libc_errno.h" 13 14 namespace LIBC_NAMESPACE { 15 16 LLVM_LIBC_FUNCTION(void, setbuf, 17 (::FILE *__restrict stream, char *__restrict buf)) { 18 int mode = _IOFBF; 19 if (buf == nullptr) 20 mode = _IONBF; 21 int err = reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->set_buffer( 22 buf, BUFSIZ, mode); 23 if (err != 0) 24 libc_errno = err; 25 } 26 27 } // namespace LIBC_NAMESPACE 28