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/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#ifdef SDL_memmove
#undef SDL_memmove
#endif
#if SDL_DYNAMIC_API
#define SDL_memmove SDL_memmove_REAL
#endif
void *SDL_memmove(SDL_OUT_BYTECAP(len) void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len)
{
#if defined(__GNUC__) && (defined(HAVE_LIBC) && HAVE_LIBC)
// Presumably this is well tuned for speed.
return __builtin_memmove(dst, src, len);
#elif defined(HAVE_MEMMOVE)
return memmove(dst, src, len);
#else
char *srcp = (char *)src;
char *dstp = (char *)dst;
if (src < dst) {
srcp += len - 1;
dstp += len - 1;
while (len--) {
*dstp-- = *srcp--;
}
} else {
while (len--) {
*dstp++ = *srcp++;
}
}
return dst;
#endif // HAVE_MEMMOVE
}
#ifndef HAVE_LIBC
// NOLINTNEXTLINE(readability-redundant-declaration)
extern void *memmove(void *dst, const void *src, size_t len);
#if defined(_MSC_VER) && !defined(__INTEL_LLVM_COMPILER)
#pragma intrinsic(memmove)
#endif
#if defined(_MSC_VER) && !defined(__clang__)
#pragma function(memmove)
#endif
// NOLINTNEXTLINE(readability-inconsistent-declaration-parameter-name)
void *memmove(void *dst, const void *src, size_t len)
{
return SDL_memmove(dst, src, len);
}
#endif // !HAVE_LIBC
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