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LibC: Add general implementation for memcpy and memset

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Timon Kruiper 2023-01-30 17:29:49 +01:00 • committed by Jelle Raaijmakers
parent a98c0c3e51
commit cff6af9f75
1 changed files with 11 additions and 14 deletions
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25
Userland/Libraries/LibC/string.cpp
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@ -136,29 +136,26 @@ void* memcpy(void* dest_ptr, void const* src_ptr, size_t n)
"rep movsb" "rep movsb"
: "+D"(dest_ptr), "+S"(src_ptr), "+c"(n)::"memory"); : "+D"(dest_ptr), "+S"(src_ptr), "+c"(n)::"memory");
return original_dest; return original_dest;
#elif ARCH(AARCH64)
(void)dest_ptr;
(void)src_ptr;
(void)n;
TODO_AARCH64();
#else #else
# error Unknown architecture u8* pd = (u8*)dest_ptr;
u8 const* ps = (u8 const*)src_ptr;
for (; n--;)
*pd++ = *ps++;
return dest_ptr;
#endif #endif
} }
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html // https://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html
// For x86-64, an optimized ASM implementation is found in ./arch/x86_64/memset.S // For x86-64, an optimized ASM implementation is found in ./arch/x86_64/memset.S
#if ARCH(AARCH64) #if ARCH(X86_64)
#else
void* memset(void* dest_ptr, int c, size_t n) void* memset(void* dest_ptr, int c, size_t n)
{ {
(void)dest_ptr; u8* pd = (u8*)dest_ptr;
(void)c; for (; n--;)
(void)n; *pd++ = c;
TODO_AARCH64(); return dest_ptr;
} }
#elif ARCH(X86_64)
#else
# error Unknown architecture
#endif #endif
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memmove.html // https://pubs.opengroup.org/onlinepubs/9699919799/functions/memmove.html