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/******************************************************************************

 *

 * Module Name: exstorob - AML Interpreter object store support, store to object

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2007, R. Byron Moore

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions, and the following disclaimer,

 *    without modification.

 * 2. Redistributions in binary form must reproduce at minimum a disclaimer

 *    substantially similar to the "NO WARRANTY" disclaimer below

 *    ("Disclaimer") and any redistribution must be conditioned upon

 *    including a substantially similar Disclaimer requirement for further

 *    binary redistribution.

 * 3. Neither the names of the above-listed copyright holders nor the names

 *    of any contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * NO WARRANTY

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGES.

 */

#include <acpi/acpi.h>

#include <acpi/acinterp.h>

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exstorob")

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_store_buffer_to_buffer

 *

 * PARAMETERS:  source_desc         - Source object to copy

 *              target_desc         - Destination object of the copy

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Copy a buffer object to another buffer object.

 *

 ******************************************************************************/

acpi_status

acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,

                               union acpi_operand_object *target_desc)

{

        u32 length;

        u8 *buffer;

        ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);

        /* We know that source_desc is a buffer by now */

        buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);

        length = source_desc->buffer.length;

        /*

         * If target is a buffer of length zero or is a static buffer,

         * allocate a new buffer of the proper length

         */

        if ((target_desc->buffer.length == 0) ||

            (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {

                target_desc->buffer.pointer = ACPI_ALLOCATE(length);

                if (!target_desc->buffer.pointer) {

                        return_ACPI_STATUS(AE_NO_MEMORY);

                }

                target_desc->buffer.length = length;

        }

        /* Copy source buffer to target buffer */

        if (length <= target_desc->buffer.length) {

                /* Clear existing buffer and copy in the new one */

                ACPI_MEMSET(target_desc->buffer.pointer, 0,

                            target_desc->buffer.length);

                ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length);

#ifdef ACPI_OBSOLETE_BEHAVIOR

                /*

                 * NOTE: ACPI versions up to 3.0 specified that the buffer must be

                 * truncated if the string is smaller than the buffer.  However, "other"

                 * implementations of ACPI never did this and thus became the defacto

                 * standard. ACPI 3.0_a changes this behavior such that the buffer

                 * is no longer truncated.

                 */

                /*

                 * OBSOLETE BEHAVIOR:

                 * If the original source was a string, we must truncate the buffer,

                 * according to the ACPI spec.  Integer-to-Buffer and Buffer-to-Buffer

                 * copy must not truncate the original buffer.

                 */

                if (original_src_type == ACPI_TYPE_STRING) {

                        /* Set the new length of the target */

                        target_desc->buffer.length = length;

                }

#endif

        } else {

                /* Truncate the source, copy only what will fit */

                ACPI_MEMCPY(target_desc->buffer.pointer, buffer,

                            target_desc->buffer.length);

                ACPI_DEBUG_PRINT((ACPI_DB_INFO,

                                  "Truncating source buffer from %X to %X\n",

                                  length, target_desc->buffer.length));

        }

        /* Copy flags */

        target_desc->buffer.flags = source_desc->buffer.flags;

        target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;

        return_ACPI_STATUS(AE_OK);

}

/*******************************************************************************

 *

 * FUNCTION:    acpi_ex_store_string_to_string

 *

 * PARAMETERS:  source_desc         - Source object to copy

 *              target_desc         - Destination object of the copy

 *

 * RETURN:      Status

 *

 * DESCRIPTION: Copy a String object to another String object

 *

 ******************************************************************************/

acpi_status

acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,

                               union acpi_operand_object *target_desc)

{

        u32 length;

        u8 *buffer;

        ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);

        /* We know that source_desc is a string by now */

        buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);

        length = source_desc->string.length;

        /*

         * Replace existing string value if it will fit and the string

         * pointer is not a static pointer (part of an ACPI table)

         */

        if ((length < target_desc->string.length) &&

            (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {

                /*

                 * String will fit in existing non-static buffer.

                 * Clear old string and copy in the new one

                 */

                ACPI_MEMSET(target_desc->string.pointer, 0,

                            (acpi_size) target_desc->string.length + 1);

                ACPI_MEMCPY(target_desc->string.pointer, buffer, length);

        } else {

                /*

                 * Free the current buffer, then allocate a new buffer

                 * large enough to hold the value

                 */

                if (target_desc->string.pointer &&

                    (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {

                        /* Only free if not a pointer into the DSDT */

                        ACPI_FREE(target_desc->string.pointer);

                }

                target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size)

                                                                   length + 1);

                if (!target_desc->string.pointer) {

                        return_ACPI_STATUS(AE_NO_MEMORY);

                }

                target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;

                ACPI_MEMCPY(target_desc->string.pointer, buffer, length);

        }

        /* Set the new target length */

        target_desc->string.length = length;

        return_ACPI_STATUS(AE_OK);

}