1 //===-- Baremetal implementation of getchar -------------------------------===// 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/getchar.h" 10 #include "src/__support/OSUtil/io.h" 11 #include "src/__support/macros/config.h" 12 13 #include "hdr/stdio_macros.h" // for EOF. 14 15 namespace LIBC_NAMESPACE_DECL { 16 17 LLVM_LIBC_FUNCTION(int, getchar, ()) { 18 char buf[1]; 19 auto result = read_from_stdin(buf, sizeof(buf)); 20 if (result < 0) 21 return EOF; 22 return buf[0]; 23 } 24 25 } // namespace LIBC_NAMESPACE_DECL 26