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#include <stddef.h>
#include <stdint.h>
#include <string.h>
int memcmp(const void *vl, const void *vr, size_t n) {
const unsigned char *l = vl, *r = vr;
for (; n && *l == *r; n--, l++, r++);
return n ? *l-*r : 0;
}
void *memcpy(void *restrict dest, const void *restrict src, size_t n) {
char *d = dest;
const char *s = src;
for (; n; n--) *d++ = *s++;
return dest;
}
void *memmove(void *dest, const void *src, size_t n) {
char *d = dest;
const char *s = src;
if (d==s) return d;
if (d<s) {
for (; n; n--) *d++ = *s++;
} else {
while (n) n--, d[n] = s[n];
}
return dest;
}
void *memset(void *dest, int c, size_t n) {
unsigned char *d = dest;
for (; n; n--) *d++ = c;
return dest;
}
char *strcpy(char *restrict dest, const char *restrict src) {
for(; (*dest = *src); dest++, src++);
return dest;
}
char *strncpy(char *restrict dest, const char *restrict src, size_t n) {
for(; (*dest = *src) && n; dest++, src++, n--);
memset(dest, 0, n);
return dest;
}
size_t strlen(const char *s) {
size_t len = 0;
for(; *s; s++, len++);
return len;
}
int strncmp(const char* lhs, const char* rhs, size_t n) {
const unsigned char *l=(void *)lhs, *r=(void *)rhs;
if (!n--) return 0;
for (; *l && *r && n && *l == *r ; l++, r++, n--);
return *l - *r;
}
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