gistfile1.c

int add_operand_lines (char *operand, char *operand_offset, int work_on_src, int i, int line_num, int addr) {
	switch (addr) {
		case 0: 
			if ((!commands[i].src_imidiate_address && work_on_src) || (!commands[i].dest_imidiate_address && !work_on_src)) {
				error_set("Error", "Illegal address.", line_num);
				return 0;
			}

			IC++;
			line_data = New(LineData);
			line_data->decimal_address = IC;
			line_data->label_to_extract = NULL;
			commands_list = list_append(commands_list, line_data);

			if((line_data->line_word.data = extract_number(&operand[1], line_num)) == 999999)
				return 0;
			break;

		case 1:
			if ((!commands[i].src_direct_address && work_on_src) || (!commands[i].dest_direct_address && !work_on_src)) {
				error_set("Error", "Illegal address.", line_num);
				return 0;
			}

			IC++;
			line_data = New(LineData);
			line_data->decimal_address = IC;
			line_data->line_word.data = 0;
			commands_list = list_append(commands_list, line_data);

			line_data->label_to_extract = (char*)malloc(strlen(operand) + 1);
			strcpy(line_data->label_to_extract, operand);
			break;

		case 2:
			if ((!commands[i].src_index_address && work_on_src) || (!commands[i].dest_index_address && !work_on_src)) {
				error_set("Error", "Illegal address.", line_num);
				return 0;
			}

			IC++;
			line_data = New(LineData);
			line_data->decimal_address = IC;
			line_data->line_word.data = 0;
			commands_list = list_append(commands_list, line_data);

			line_data->label_to_extract = (char*)malloc(strlen(operand) + 1);
			strcpy(line_data->label_to_extract, operand);

			if (isdigit(*operand_offset) || *operand_offset=='+' || *operand_offset=='-') {
				IC++;
				line_data = New(LineData);
				line_data->decimal_address = IC;
				line_data->label_to_extract = NULL;
				commands_list = list_append(commands_list, line_data);

				if((line_data->line_word.data = extract_number(operand_offset, line_num)) == 999999) {
					error_set("Error", "Illegal address.", line_num);
					return 0;
				}
			}
			else if (!(*operand_offset == 'r' && strlen(operand_offset) == 2 && *(operand_offset + 1) >= '0' && *(operand_offset + 1) <= '7')) {
				IC++;
				line_data = New(LineData);
				line_data->decimal_address = IC;
				line_data->line_word.data = 0;
				commands_list = list_append(commands_list, line_data);

				line_data->label_to_extract = (char*)malloc(strlen(operand_offset) + 1);
				strcpy(line_data->label_to_extract, operand_offset);
			}
			break;

		case 3:
			if  ((!commands[i].src_direct_reg_address && work_on_src) || (!commands[i].dest_direct_reg_address && !work_on_src)) {
				error_set("Error", "Illegal address.", line_num);
				return 0;
			}
			break;
		}

	return 1;
}