| 1 | //===-- Implementation of memccpy ----------------------------------------===// |
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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/string/memccpy.h" |
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| 10 | |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include <stddef.h> // For size_t. |
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| 13 | |
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| 14 | namespace LIBC_NAMESPACE { |
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| 15 | |
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| 16 | LLVM_LIBC_FUNCTION(void *, memccpy, |
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| 17 | (void *__restrict dest, const void *__restrict src, int c, |
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| 18 | size_t count)) { |
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| 19 | unsigned char end = static_cast<unsigned char>(c); |
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| 20 | const unsigned char *uc_src = static_cast<const unsigned char *>(src); |
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| 21 | unsigned char *uc_dest = static_cast<unsigned char *>(dest); |
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| 22 | size_t i = 0; |
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| 23 | // Copy up until end is found. |
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| 24 | for (; i < count && uc_src[i] != end; ++i) |
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| 25 | uc_dest[i] = uc_src[i]; |
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| 26 | // if i < count, then end must have been found, so copy end into dest and |
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| 27 | // return the byte after. |
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| 28 | if (i < count) { |
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| 29 | uc_dest[i] = uc_src[i]; |
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| 30 | return uc_dest + i + 1; |
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| 31 | } |
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| 32 | return nullptr; |
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| 33 | } |
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| 34 | |
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| 35 | } // namespace LIBC_NAMESPACE |
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| 36 | |
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