Function ap_timeout_parameter_parse

server/util.c:2622–2680

 */
#define CHECK_OVERFLOW(a, b) if (a > b) return APR_EGENERAL
AP_DECLARE(apr_status_t) ap_timeout_parameter_parse(
                                               const char *timeout_parameter,
                                               apr_interval_time_t *timeout,
                                               const char *default_time_unit)
{
    char *endp;
    const char *time_str;
    apr_int64_t tout;
    apr_uint64_t check;

    tout = apr_strtoi64(timeout_parameter, &endp, 10);
    if (errno) {
        return errno;
    }
    if (!endp || !*endp) {
        time_str = default_time_unit;
    }
    else {
        time_str = endp;
    }

    if (tout < 0) { 
        return APR_EGENERAL;
    }

    switch (*time_str) {
        /* Time is in seconds */
    case 's':
        CHECK_OVERFLOW(tout, apr_time_sec(APR_INT64_MAX));
        check = apr_time_from_sec(tout);
        break;
        /* Time is in hours */
    case 'h':
        CHECK_OVERFLOW(tout, apr_time_sec(APR_INT64_MAX / 3600));
        check = apr_time_from_sec(tout * 3600);
        break;
    case 'm':
        switch (*(++time_str)) {
        /* Time is in milliseconds */
        case 's':
            CHECK_OVERFLOW(tout, apr_time_as_msec(APR_INT64_MAX));
            check = apr_time_from_msec(tout);
            break;
        /* Time is in minutes */
        case 'i':
            CHECK_OVERFLOW(tout, apr_time_sec(APR_INT64_MAX / 60));
            check = apr_time_from_sec(tout * 60);
            break;
        default:
            return APR_EGENERAL;
        }
        break;
    default:
        return APR_EGENERAL;
    }

    *timeout = (apr_interval_time_t)check;
    return APR_SUCCESS;