| 1 | //===-- Implementation of puts --------------------------------------------===// |
|---|---|
| 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/puts.h" |
| 10 | #include "src/__support/CPP/string_view.h" |
| 11 | #include "src/__support/File/file.h" |
| 12 | |
| 13 | #include "src/errno/libc_errno.h" |
| 14 | #include <stdio.h> |
| 15 | |
| 16 | namespace LIBC_NAMESPACE { |
| 17 | |
| 18 | namespace { |
| 19 | |
| 20 | // Simple helper to unlock the file once destroyed. |
| 21 | struct ScopedLock { |
| 22 | ScopedLock(LIBC_NAMESPACE::File *stream) : stream(stream) { stream->lock(); } |
| 23 | ~ScopedLock() { stream->unlock(); } |
| 24 | |
| 25 | private: |
| 26 | LIBC_NAMESPACE::File *stream; |
| 27 | }; |
| 28 | |
| 29 | } // namespace |
| 30 | |
| 31 | LLVM_LIBC_FUNCTION(int, puts, (const char *__restrict str)) { |
| 32 | cpp::string_view str_view(str); |
| 33 | |
| 34 | // We need to lock the stream to ensure the newline is always appended. |
| 35 | ScopedLock lock(LIBC_NAMESPACE::stdout); |
| 36 | |
| 37 | auto result = LIBC_NAMESPACE::stdout->write_unlocked(data: str, len: str_view.size()); |
| 38 | if (result.has_error()) |
| 39 | libc_errno = result.error; |
| 40 | size_t written = result.value; |
| 41 | if (str_view.size() != written) { |
| 42 | // The stream should be in an error state in this case. |
| 43 | return EOF; |
| 44 | } |
| 45 | result = LIBC_NAMESPACE::stdout->write_unlocked(data: "\n", len: 1); |
| 46 | if (result.has_error()) |
| 47 | libc_errno = result.error; |
| 48 | written = result.value; |
| 49 | if (1 != written) { |
| 50 | // The stream should be in an error state in this case. |
| 51 | return EOF; |
| 52 | } |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | } // namespace LIBC_NAMESPACE |
| 57 |