54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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#include <stdint.h>
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#include <stddef.h>
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void *memcpy(void *dest, const void *src, size_t n) {
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uint8_t *pdest = (uint8_t *)dest;
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const uint8_t *psrc = (const uint8_t *)src;
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for (size_t i = 0; i < n; i++) {
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pdest[i] = psrc[i];
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}
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return dest;
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}
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void *memset(void *s, int c, size_t n) {
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uint8_t *p = (uint8_t *)s;
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for (size_t i = 0; i < n; i++) {
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p[i] = (uint8_t)c;
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}
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return s;
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}
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void *memmove(void *dest, const void *src, size_t n) {
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uint8_t *pdest = (uint8_t *)dest;
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const uint8_t *psrc = (const uint8_t *)src;
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if (src > dest) {
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for (size_t i = 0; i < n; i++) {
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pdest[i] = psrc[i];
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}
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} else if (src < dest) {
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for (size_t i = n; i > 0; i--) {
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pdest[i-1] = psrc[i-1];
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}
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}
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return dest;
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}
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int memcmp(const void *s1, const void *s2, size_t n) {
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const uint8_t *p1 = (const uint8_t *)s1;
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const uint8_t *p2 = (const uint8_t *)s2;
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for (size_t i = 0; i < n; i++) {
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if (p1[i] != p2[i]) {
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return p1[i] < p2[i] ? -1 : 1;
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}
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}
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return 0;
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}
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