Function Push

hyperdbg/script-engine/code/common.c:440–494

* @brief Adds Token to the last empty position of TokenList * * @param TokenList the token list to push into * @param Token the token to add * @return PSCRIPT_ENGINE_TOKEN_LIST */

 * @return PSCRIPT_ENGINE_TOKEN_LIST
 */
PSCRIPT_ENGINE_TOKEN_LIST
Push(PSCRIPT_ENGINE_TOKEN_LIST TokenList, PSCRIPT_ENGINE_TOKEN Token)
{
    //
    // Calculate address to write new token
    //
    uintptr_t              Head      = (uintptr_t)TokenList->Head;
    uintptr_t              Pointer   = (uintptr_t)TokenList->Pointer;
    PSCRIPT_ENGINE_TOKEN * WriteAddr = (PSCRIPT_ENGINE_TOKEN *)(Head + Pointer * sizeof(PSCRIPT_ENGINE_TOKEN));

    //
    // Write Token to appropriate address in TokenList
    //
    *WriteAddr = Token;

    //
    // Update Pointer
    //
    TokenList->Pointer++;

    //
    // Handle overflow
    //
    if (Pointer == TokenList->Size - 1)
    {
        //
        // Allocate a new buffer for string list with doubled length
        //
        PSCRIPT_ENGINE_TOKEN * NewHead = (PSCRIPT_ENGINE_TOKEN *)malloc(2 * TokenList->Size * sizeof(PSCRIPT_ENGINE_TOKEN));

        if (NewHead == NULL)
        {
            printf("err, could not allocate buffer");
            return NULL;
        }

        //
        // Copy old buffer to new buffer
        //
        memcpy(NewHead, TokenList->Head, TokenList->Size * sizeof(PSCRIPT_ENGINE_TOKEN));

        //
        // Free old buffer
        //
        free(TokenList->Head);

        //
        // Update Head and size of TokenList
        //
        TokenList->Size = TokenList->Size * 2;
        TokenList->Head = NewHead;
    }

    return TokenList;
}
/**
 * @brief Removes last Token of a TokenList and returns it
 *