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