/*
 * Copyright (c) 2021 Chipsea Technologies (Shenzhen) Corp., Ltd. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Just to solve the '_sbrk' undefined issue.
 */
#include <sys/types.h>

extern int __HEAP_START;

caddr_t _sbrk(int incr) {
    static unsigned char *heap = NULL;
    unsigned char *prev_heap;

    if (heap == NULL) {
        heap = (unsigned char*)&__HEAP_START;
    }

    prev_heap = heap;

    heap += incr;

    return (caddr_t)prev_heap;
}