From 9bc8a11afeed3569736b89754012e3ca22ee10f6 Mon Sep 17 00:00:00 2001 From: pommicket Date: Sun, 20 Feb 2022 13:18:21 -0800 Subject: conclusion --- 05/musl-0.6.0/src/string/memcpy.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 05/musl-0.6.0/src/string/memcpy.c (limited to '05/musl-0.6.0/src/string/memcpy.c') diff --git a/05/musl-0.6.0/src/string/memcpy.c b/05/musl-0.6.0/src/string/memcpy.c new file mode 100644 index 0000000..02cb469 --- /dev/null +++ b/05/musl-0.6.0/src/string/memcpy.c @@ -0,0 +1,29 @@ +#include +#include +#include + +#define SS (sizeof(size_t)) +#define ALIGN (sizeof(size_t)-1) +#define ONES ((size_t)-1/UCHAR_MAX) + +void *memcpy(void *dest, const void *src, size_t n) +{ + unsigned char *d = dest; + const unsigned char *s = src; + + if (((uintptr_t)d & ALIGN) != ((uintptr_t)s & ALIGN)) + goto misaligned; + + for (; ((uintptr_t)d & ALIGN) && n; n--) *d++ = *s++; + if (n) { + size_t *wd = (void *)d; + const size_t *ws = (const void *)s; + + for (; n>=SS; n-=SS) *wd++ = *ws++; + d = (void *)wd; + s = (const void *)ws; +misaligned: + for (; n; n--) *d++ = *s++; + } + return dest; +} -- cgit v1.2.3