| 1 | //===-- Linux implementation of cfsetispeed -------------------------------===// |
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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/termios/cfsetispeed.h" |
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| 10 | |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/libc_errno.h" |
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| 13 | #include "src/__support/macros/config.h" |
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| 14 | |
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| 15 | #include <termios.h> |
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| 16 | |
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| 17 | namespace LIBC_NAMESPACE_DECL { |
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| 18 | |
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| 19 | LLVM_LIBC_FUNCTION(int, cfsetispeed, (struct termios * t, speed_t speed)) { |
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| 20 | constexpr speed_t NOT_SPEED_MASK = ~speed_t(CBAUD); |
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| 21 | // A speed value is valid only if it is equal to one of the B<NN+> values. |
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| 22 | if (t == nullptr || ((speed & NOT_SPEED_MASK) != 0)) { |
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| 23 | libc_errno = EINVAL; |
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| 24 | return -1; |
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| 25 | } |
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| 26 | |
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| 27 | t->c_cflag = (t->c_cflag & NOT_SPEED_MASK) | speed; |
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| 28 | t->c_ispeed = speed; |
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| 29 | return 0; |
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| 30 | } |
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| 31 | |
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| 32 | } // namespace LIBC_NAMESPACE_DECL |
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| 33 | |
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