strncmp.c

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#include <string.h>
 
int strncmp(const char* s1, const char* s2, size_t n)
{
    while (n && *s1 && (*s1 == *s2))
    {
        ++s1;
        ++s2;
        --n;
    }
 
    if (n == 0)
    {
        return 0;
    }
    else
    {
        return (*(unsigned char*)s1 - *(unsigned char*)s2);
    }
}