Function lookup_map_program

modules/mappers/mod_rewrite.c:1577–1739

}

static char *lookup_map_program(request_rec *r, apr_file_t *fpin,
                                apr_file_t *fpout, char *key)
{
    char *buf;
    char c;
    apr_size_t i, nbytes, combined_len = 0;
    apr_status_t rv;
    const char *eol = APR_EOL_STR;
    apr_size_t eolc = 0;
    int found_nl = 0;
    result_list *buflist = NULL, *curbuf = NULL;

#ifndef NO_WRITEV
    struct iovec iova[2];
    apr_size_t niov;
#endif

    /* when `RewriteEngine off' was used in the per-server
     * context then the rewritemap-programs were not spawned.
     * In this case using such a map (usually in per-dir context)
     * is useless because it is not available.
     *
     * newlines in the key leave bytes in the pipe and cause
     * bad things to happen (next map lookup will use the chars
     * after the \n instead of the new key etc etc - in other words,
     * the Rewritemap falls out of sync with the requests).
     */
    if (fpin == NULL || fpout == NULL || ap_strchr(key, '\n')) {
        return NULL;
    }

    /* take the lock */
    if (rewrite_mapr_lock_acquire) {
        rv = apr_global_mutex_lock(rewrite_mapr_lock_acquire);
        if (rv != APR_SUCCESS) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00659)
                          "apr_global_mutex_lock(rewrite_mapr_lock_acquire) "
                          "failed");
            return NULL; /* Maybe this should be fatal? */
        }
    }

    /* write out the request key */
#ifdef NO_WRITEV
    nbytes = strlen(key);
    /* XXX: error handling */
    apr_file_write_full(fpin, key, nbytes, NULL);
    nbytes = 1;
    apr_file_write_full(fpin, "\n", nbytes, NULL);
#else
    iova[0].iov_base = key;
    iova[0].iov_len = strlen(key);
    iova[1].iov_base = "\n";
    iova[1].iov_len = 1;

    niov = 2;
    /* XXX: error handling */
    apr_file_writev_full(fpin, iova, niov, &nbytes);