/*******************************************************
 * Copyright (c) 2015, ArrayFire
 * All rights reserved.
 *
 * This file is distributed under 3-clause BSD license.
 * The complete license agreement can be obtained at:
 * http://arrayfire.com/licenses/BSD-3-Clause
 ********************************************************/

#include <af/array.h>
#include <af/device.h>
#include <af/exception.h>
#include <algorithm>
#include "symbol_manager.hpp"

void af_get_last_error(char **str, dim_t *len) {
    // Set error message from unified backend
    std::string &global_error_string = get_global_error_string();
    dim_t slen = std::min(MAX_ERR_SIZE, (int)global_error_string.size());

    // If this is true, the error is coming from the unified backend.
    if (slen != 0) {
        if (len && slen == 0) {
            *len = 0;
            *str = NULL;
            return;
        }

        af_alloc_host((void **)str, sizeof(char) * (slen + 1));
        global_error_string.copy(*str, slen);

        (*str)[slen]        = '\0';
        global_error_string = std::string("");

        if (len) *len = slen;
    } else {
        // If false, the error is coming from active backend.
        typedef void (*af_func)(char **, dim_t *);
        af_func func = (af_func)LOAD_SYMBOL();
        func(str, len);
    }
}