strncmp.c

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int strncmp(char *s1, char *s2, int n)
{

    while (--n >= 0 && *s1 == *s2++)
    {
        if (*s1++ == '\0')
        {
            return 0;
        }
    }
    return (n < 0 ? 0 : *s1 - *--s2);
}