strncat.c

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char *strncat(char *s1, const char *s2, int n)
{
    char *os1;

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