exconvrt.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

			if (!leading_zero) {
				string[k] = hex_digit;
				k++;
			}
		}
		break;

	default:
		break;
	}

	/*
	 * Since leading zeros are supressed, we must check for the case where
	 * the integer equals 0.
	 *
	 * Finally, null terminate the string and return the length
	 */
	if (!k) {
		string [0] = ASCII_ZERO;
		k = 1;
	}
	string [k] = 0;

	return (k);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ex_convert_to_string
 *
 * PARAMETERS:  *Obj_desc       - Object to be converted.  Must be an
 *                                Integer, Buffer, or String
 *              Walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an ACPI Object to a string
 *
 ******************************************************************************/

acpi_status
acpi_ex_convert_to_string (
	acpi_operand_object     *obj_desc,
	acpi_operand_object     **result_desc,
	u32                     base,
	u32                     max_length,
	acpi_walk_state         *walk_state)
{
	acpi_operand_object     *ret_desc;
	u32                     i;
	u32                     index;
	u32                     string_length;
	u32                     integer_size = sizeof (acpi_integer);
	u8                      *new_buf;
	u8                      *pointer;


	FUNCTION_ENTRY ();


	switch (obj_desc->common.type) {
	case ACPI_TYPE_INTEGER:

		/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */

		if (walk_state->method_node->flags & ANOBJ_DATA_WIDTH_32) {
			/*
			 * We are running a method that exists in a 32-bit ACPI table.
			 * Truncate the value to 32 bits by zeroing out the upper
			 * 32-bit field
			 */
			integer_size = sizeof (u32);
		}

		string_length = integer_size * 2;
		if (base == 10) {
			string_length = ACPI_MAX_DECIMAL_DIGITS;
		}

		/*
		 * Create a new String
		 */
		ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
		if (!ret_desc) {
			return (AE_NO_MEMORY);
		}

		/* Need enough space for one ASCII integer plus null terminator */

		new_buf = ACPI_MEM_CALLOCATE (string_length + 1);
		if (!new_buf) {
			REPORT_ERROR
				(("Ex_convert_to_string: Buffer allocation failure\n"));
			acpi_ut_remove_reference (ret_desc);
			return (AE_NO_MEMORY);
		}


		/* Convert */

		i = acpi_ex_convert_to_ascii (obj_desc->integer.value, base, new_buf);

		/* Null terminate at the correct place */

		if (max_length < i) {
			new_buf[max_length] = 0;
			ret_desc->string.length = max_length;
		}
		else {
			new_buf [i] = 0;
			ret_desc->string.length = i;
		}

		ret_desc->buffer.pointer = new_buf;

		/* Return the new buffer descriptor */

		if (*result_desc == obj_desc) {
			if (walk_state->opcode != AML_STORE_OP) {
				acpi_ut_remove_reference (obj_desc);
			}
		}

		*result_desc = ret_desc;
		break;


	case ACPI_TYPE_BUFFER:

		string_length = obj_desc->buffer.length * 3;
		if (base == 10) {
			string_length = obj_desc->buffer.length * 4;
		}

		if (max_length > ACPI_MAX_STRING_CONVERSION) {
			if (string_length > ACPI_MAX_STRING_CONVERSION) {
				return (AE_AML_STRING_LIMIT);
			}
		}

		/*
		 * Create a new string object
		 */
		ret_desc = acpi_ut_create_internal_object (ACPI_TYPE_STRING);
		if (!ret_desc) {
			return (AE_NO_MEMORY);
		}

		/* String length is the lesser of the Max or the actual length */

		if (max_length < string_length) {
			string_length = max_length;
		}

		new_buf = ACPI_MEM_CALLOCATE (string_length + 1);
		if (!new_buf) {
			REPORT_ERROR
				(("Ex_convert_to_string: Buffer allocation failure\n"));
			acpi_ut_remove_reference (ret_desc);
			return (AE_NO_MEMORY);
		}

		/*
		 * Convert each byte of the buffer to two ASCII characters plus a space.
		 */
		pointer = obj_desc->buffer.pointer;
		index = 0;
		for (i = 0, index = 0; i < obj_desc->buffer.length; i++) {
			index = acpi_ex_convert_to_ascii (pointer[i], base, &new_buf[index]);

			new_buf[index] = ' ';
			index++;
		}

		/* Null terminate */

		new_buf [index-1] = 0;
		ret_desc->buffer.pointer = new_buf;
		ret_desc->string.length = STRLEN ((char *) new_buf);


		/* Return the new buffer descriptor */

		if (*result_desc == obj_desc) {
			if (walk_state->opcode != AML_STORE_OP) {
				acpi_ut_remove_reference (obj_desc);
			}
		}

		*result_desc = ret_desc;
		break;


	case ACPI_TYPE_STRING:

		if (max_length >= obj_desc->string.length) {
			*result_desc = obj_desc;
		}

		else {
			/* Must copy the string first and then truncate it */

			return (AE_NOT_IMPLEMENTED);
		}
		break;


	default:
		return (AE_TYPE);
		break;
   }

	return (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    Acpi_ex_convert_to_target_type
 *
 * PARAMETERS:  *Obj_desc       - Object to be converted.
 *              Walk_state      - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION:
 *
 ******************************************************************************/

acpi_status
acpi_ex_convert_to_target_type (
	acpi_object_type8       destination_type,
	acpi_operand_object     **obj_desc,
	acpi_walk_state         *walk_state)
{
	acpi_status             status = AE_OK;


	FUNCTION_TRACE ("Ex_convert_to_target_type");


	/*
	 * If required by the target,
	 * perform implicit conversion on the source before we store it.
	 */
	switch (GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args)) {
	case ARGI_SIMPLE_TARGET:
	case ARGI_FIXED_TARGET:
	case ARGI_INTEGER_REF:      /* Handles Increment, Decrement cases */

		switch (destination_type) {
		case INTERNAL_TYPE_REGION_FIELD:
			/*
			 * Named field can always handle conversions
			 */
			break;

		default:
			/* No conversion allowed for these types */

			if (destination_type != (*obj_desc)->common.type) {
				ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
					"Target does not allow conversion of type %s to %s\n",
					acpi_ut_get_type_name ((*obj_desc)->common.type),
					acpi_ut_get_type_name (destination_type)));
				status = AE_TYPE;
			}
		}
		break;


	case ARGI_TARGETREF:

		switch (destination_type) {
		case ACPI_TYPE_INTEGER:
		case ACPI_TYPE_BUFFER_FIELD:
		case INTERNAL_TYPE_BANK_FIELD:
		case INTERNAL_TYPE_INDEX_FIELD:
			/*
			 * These types require an Integer operand.  We can convert
			 * a Buffer or a String to an Integer if necessary.
			 */
			status = acpi_ex_convert_to_integer (*obj_desc, obj_desc, walk_state);
			break;


		case ACPI_TYPE_STRING:

			/*
			 * The operand must be a String.  We can convert an
			 * Integer or Buffer if necessary
			 */
			status = acpi_ex_convert_to_string (*obj_desc, obj_desc, 16, ACPI_UINT32_MAX, walk_state);
			break;


		case ACPI_TYPE_BUFFER:

			/*
			 * The operand must be a String.  We can convert an
			 * Integer or Buffer if necessary
			 */
			status = acpi_ex_convert_to_buffer (*obj_desc, obj_desc, walk_state);
			break;
		}
		break;


	case ARGI_REFERENCE:
		/*
		 * Create_xxxx_field cases - we are storing the field object into the name
		 */
		break;


	default:
		ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
			"Unknown Target type ID 0x%X Op %s Dest_type %s\n",
			GET_CURRENT_ARG_TYPE (walk_state->op_info->runtime_args),
			walk_state->op_info->name, acpi_ut_get_type_name (destination_type)));

		status = AE_AML_INTERNAL;
	}


	/*
	 * Source-to-Target conversion semantics:
	 *
	 * If conversion to the target type cannot be performed, then simply
	 * overwrite the target with the new object and type.
	 */
	if (status == AE_TYPE) {
		status = AE_OK;
	}

	return_ACPI_STATUS (status);
}