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