36 lines
720 B
C
36 lines
720 B
C
#include "string.h"
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void kmemmove(char* dst, char* src, size_t size) {
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if (dst == src) return;
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if (dst > src && dst < src + size) { // s d
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// copy right-to-left
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for (; size != 0; size--) {
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dst[size - 1] = src[size - 1];
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}
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} else {
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// copy left-to-right
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for (size_t i = 0; i < size; ++i) {
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dst[i] = src[i];
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}
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}
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}
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int strncmp(const char* s1, const char* s2, size_t size) {
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while (size && *s1 && *s2 && *s1 == *s2) {
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size--;
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s1++;
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s2++;
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}
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if (!size) {
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return 0;
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}
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return (unsigned char)(*s1) - (unsigned char)(*s2);
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}
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void memset(void* b, char c, size_t len) {
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char* p = b;
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for (size_t i = 0; i < len; ++i) {
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p[i] = c;
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}
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}
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