| 1 | //===-- Implementation of puts --------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/stdio/puts.h" |
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| 10 | #include "src/__support/CPP/string_view.h" |
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| 11 | #include "src/__support/File/file.h" |
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| 12 | |
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| 13 | #include "hdr/types/FILE.h" |
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| 14 | #include "src/__support/libc_errno.h" |
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| 15 | #include "src/__support/macros/config.h" |
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| 16 | #include <stddef.h> |
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| 17 | |
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| 18 | namespace LIBC_NAMESPACE_DECL { |
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| 19 | |
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| 20 | namespace { |
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| 21 | |
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| 22 | // Simple helper to unlock the file once destroyed. |
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| 23 | struct ScopedLock { |
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| 24 | ScopedLock(LIBC_NAMESPACE::File *stream) : stream(stream) { stream->lock(); } |
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| 25 | ~ScopedLock() { stream->unlock(); } |
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| 26 | |
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| 27 | private: |
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| 28 | LIBC_NAMESPACE::File *stream; |
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| 29 | }; |
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| 30 | |
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| 31 | } // namespace |
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| 32 | |
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| 33 | LLVM_LIBC_FUNCTION(int, puts, (const char *__restrict str)) { |
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| 34 | cpp::string_view str_view(str); |
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| 35 | |
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| 36 | // We need to lock the stream to ensure the newline is always appended. |
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| 37 | ScopedLock lock(LIBC_NAMESPACE::stdout); |
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| 38 | |
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| 39 | auto result = LIBC_NAMESPACE::stdout->write_unlocked(str, str_view.size()); |
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| 40 | if (result.has_error()) |
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| 41 | libc_errno = result.error; |
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| 42 | size_t written = result.value; |
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| 43 | if (str_view.size() != written) { |
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| 44 | // The stream should be in an error state in this case. |
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| 45 | return EOF; |
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| 46 | } |
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| 47 | result = LIBC_NAMESPACE::stdout->write_unlocked("\n" , 1); |
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| 48 | if (result.has_error()) |
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| 49 | libc_errno = result.error; |
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| 50 | written = result.value; |
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| 51 | if (1 != written) { |
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| 52 | // The stream should be in an error state in this case. |
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| 53 | return EOF; |
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| 54 | } |
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| 55 | return 0; |
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| 56 | } |
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| 57 | |
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| 58 | } // namespace LIBC_NAMESPACE_DECL |
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| 59 | |
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