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35 lines
753 B
C++
35 lines
753 B
C++
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//
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// swab.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// Defines the _swab function, which copies a source buffer into a destination
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// buffer, swapping the odd and even bytes of each word as it does so.
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//
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#include <corecrt_internal.h>
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#include <stdlib.h>
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extern "C" void __cdecl _swab(
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char* source,
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char* destination,
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int bytes
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)
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{
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_VALIDATE_RETURN_VOID(source != nullptr, EINVAL);
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_VALIDATE_RETURN_VOID(destination != nullptr, EINVAL);
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_VALIDATE_RETURN_VOID(bytes >= 0, EINVAL);
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while (bytes > 1)
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{
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char const b1 = *source++;
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char const b2 = *source++;
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*destination++ = b2;
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*destination++ = b1;
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bytes -= 2;
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}
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}
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