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LibC: Add general implementation for memcpy and memset

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This commit is contained in:
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"
: "+D"(dest_ptr), "+S"(src_ptr), "+c"(n)::"memory");
return original_dest;
#elif ARCH(AARCH64)
(void)dest_ptr;
(void)src_ptr;
(void)n;
TODO_AARCH64();
#else
# error Unknown architecture
u8* pd = (u8*)dest_ptr;
u8 const* ps = (u8 const*)src_ptr;
for (; n--;)
*pd++ = *ps++;
return dest_ptr;
#endif
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memset.html
// 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)dest_ptr;
(void)c;
(void)n;
TODO_AARCH64();
u8* pd = (u8*)dest_ptr;
for (; n--;)
*pd++ = c;
return dest_ptr;
}
#elif ARCH(X86_64)
#else
# error Unknown architecture
#endif
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memmove.html