Function select_random_value_part

modules/mappers/mod_rewrite.c:1272–1300

}

static char *select_random_value_part(request_rec *r, char *value)
{
    char *p = value;
    unsigned n = 1;

    /* count number of distinct values */
    while ((p = ap_strchr(p, '|')) != NULL) {
        ++n;
        ++p;
    }

    if (n > 1) {
        n = ap_random_pick(1, n);

        /* extract it from the whole string */
        while (--n && (value = ap_strchr(value, '|')) != NULL) {
            ++value;
        }

        if (value) { /* should not be NULL, but ... */
            p = ap_strchr(value, '|');
            if (p) {
                *p = '\0';
            }
        }
    }

    return value;
}

/* child process code */
static void rewrite_child_errfn(apr_pool_t *p, apr_status_t err,