Strncpy

/*
 * Apache's "replacement" for the strncpy() function. We roll our
 * own to implement these specific changes:
 *   (1) strncpy() doesn't always null terminate and we want it to.
 *   (2) strncpy() null fills, which is bogus, esp. when copy 8byte
 *       strings into 8k blocks.
 *   (3) Instead of returning the pointer to the beginning of
 *       the destination string, we return a pointer to the
 *       terminating '\0' to allow us to "check" for truncation
 *
 * apr_cpystrn() follows the same call structure as strncpy().
 */
 
APR_DECLARE(char *) apr_cpystrn(char *dst, const char *src, apr_size_t dst_size)
{
 
    char *d, *end;
 
    if (dst_size == 0) {
        return (dst);
    }
 
    d = dst;
    end = dst + dst_size - 1;
 
    for (; d < end; ++d, ++src) {
    if (!(*d = *src)) {
        return (d);
    }
    }
 
    *d = '\0';  /* always null terminate */
 
    return (d);
}

char * __cdecl strncpy (
        char * dest,
        const char * source,
        size_t count
        )
{
        char *start = dest;
 
        while (count && (*dest++ = *source++))    /* copy string */
                count--;
 
        if (count)                              /* pad out with zeroes */
                while (--count)
                        *dest++ = '\0';
 
        return(start);
}