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LibC: Implement memccpy

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This commit is contained in:
René Hickersberger 2023-06-24 11:56:09 +02:00 • committed by Tim Schumacher
parent ad560cff0f
commit f2bd3904da
2 changed files with 14 additions and 0 deletions
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13
Userland/Libraries/LibC/string.cpp
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@ -151,6 +151,19 @@ void* memcpy(void* dest_ptr, void const* src_ptr, size_t n)
#endif #endif
} }
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/memccpy.html
void* memccpy(void* dest_ptr, void const* src_ptr, int c, size_t n)
{
u8* pd = static_cast<u8*>(dest_ptr);
u8 const* ps = static_cast<u8 const*>(src_ptr);
for (; n--; pd++, ps++) {
*pd = *ps;
if (*pd == static_cast<u8>(c))
return pd + 1;
}
return nullptr;
}
// 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(X86_64) #if ARCH(X86_64)

1
Userland/Libraries/LibC/string.h
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@ -34,6 +34,7 @@ int strncmp(char const*, char const*, size_t);
int memcmp(void const*, void const*, size_t); int memcmp(void const*, void const*, size_t);
int timingsafe_memcmp(void const*, void const*, size_t); int timingsafe_memcmp(void const*, void const*, size_t);
void* memcpy(void*, void const*, size_t); void* memcpy(void*, void const*, size_t);
void* memccpy(void*, void const*, int, size_t);
void* memmove(void*, void const*, size_t); void* memmove(void*, void const*, size_t);
void* memchr(void const*, int c, size_t); void* memchr(void const*, int c, size_t);
void* memmem(void const* haystack, size_t, void const* needle, size_t); void* memmem(void const* haystack, size_t, void const* needle, size_t);