strncpy.c

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char *strncpy(char *s1, const char *s2, int n)
{
    register int i;
    register char *os1;

    os1 = s1;
    for (i = 0; i < n; i++)
    {
        if (((*s1++) = (*s2++)) == '\0')
        {
            while (++i < n)
            {
                *s1++ = '\0';
            }
            return os1;
        }
    }
    return os1;
}