diff options
author | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
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committer | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
commit | 9bc8a11afeed3569736b89754012e3ca22ee10f6 (patch) | |
tree | 5f0ec0d5c05f879b1ee86adfa654ed3ef2178d5f /05/musl-0.6.0/src/string/memcpy.c | |
parent | 0f97a589b800bdb71dda05984192f0f66a52edaa (diff) |
conclusion
Diffstat (limited to '05/musl-0.6.0/src/string/memcpy.c')
-rw-r--r-- | 05/musl-0.6.0/src/string/memcpy.c | 29 |
1 files changed, 29 insertions, 0 deletions
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 <string.h> +#include <stdlib.h> +#include <stdint.h> + +#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; +} |