44 lines
1,020 B
C
44 lines
1,020 B
C
#include <stddef.h>
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#include <stdint.h>
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void *ft_memmove(void *dst, const void *src, size_t n)
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{
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unsigned char *d = dst;
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const unsigned char *s = src;
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if (d == s || n == 0)
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return dst;
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if (d < s) {
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while (((uintptr_t)d % sizeof(size_t)) && n) {
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*d++ = *s++;
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n--;
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}
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while (n >= sizeof(size_t)) {
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*(size_t *)d = *(const size_t *)s;
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d += sizeof(size_t);
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s += sizeof(size_t);
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n -= sizeof(size_t);
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}
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while (n--) {
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*d++ = *s++;
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}
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} else {
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d += n;
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s += n;
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while (n && ((uintptr_t)d % sizeof(size_t))) {
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*(--d) = *(--s);
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n--;
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}
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while (n >= sizeof(size_t)) {
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d -= sizeof(size_t);
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s -= sizeof(size_t);
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*(size_t *)d = *(const size_t *)s;
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n -= sizeof(size_t);
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}
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while (n--) {
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*(--d) = *(--s);
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}
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}
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return (dst);
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}
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