2 /******************************************************************************
4 * Module Name: exstorob - AML Interpreter object store support, store to object
6 *****************************************************************************/
9 * Copyright (C) 2000 - 2005, R. Byron Moore
10 * All rights reserved.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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42 * POSSIBILITY OF SUCH DAMAGES.
46 #include <acpi/acpi.h>
47 #include <acpi/acinterp.h>
50 #define _COMPONENT ACPI_EXECUTER
51 ACPI_MODULE_NAME ("exstorob")
54 /*******************************************************************************
56 * FUNCTION: acpi_ex_store_buffer_to_buffer
58 * PARAMETERS: source_desc - Source object to copy
59 * target_desc - Destination object of the copy
63 * DESCRIPTION: Copy a buffer object to another buffer object.
65 ******************************************************************************/
68 acpi_ex_store_buffer_to_buffer (
69 acpi_object_type original_src_type,
70 union acpi_operand_object *source_desc,
71 union acpi_operand_object *target_desc)
77 ACPI_FUNCTION_TRACE_PTR ("ex_store_buffer_to_buffer", source_desc);
81 * We know that source_desc is a buffer by now
83 buffer = (u8 *) source_desc->buffer.pointer;
84 length = source_desc->buffer.length;
87 * If target is a buffer of length zero or is a static buffer,
88 * allocate a new buffer of the proper length
90 if ((target_desc->buffer.length == 0) ||
91 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
92 target_desc->buffer.pointer = ACPI_MEM_ALLOCATE (length);
93 if (!target_desc->buffer.pointer) {
94 return_ACPI_STATUS (AE_NO_MEMORY);
97 target_desc->buffer.length = length;
100 /* Copy source buffer to target buffer */
102 if (length <= target_desc->buffer.length) {
103 /* Clear existing buffer and copy in the new one */
105 ACPI_MEMSET (target_desc->buffer.pointer, 0, target_desc->buffer.length);
106 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, length);
109 * If the original source was a string, we must truncate the buffer,
110 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
111 * copy must not truncate the original buffer.
113 if (original_src_type == ACPI_TYPE_STRING) {
114 /* Set the new length of the target */
116 target_desc->buffer.length = length;
120 /* Truncate the source, copy only what will fit */
122 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, target_desc->buffer.length);
124 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
125 "Truncating source buffer from %X to %X\n",
126 length, target_desc->buffer.length));
131 target_desc->buffer.flags = source_desc->buffer.flags;
132 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
133 return_ACPI_STATUS (AE_OK);
137 /*******************************************************************************
139 * FUNCTION: acpi_ex_store_string_to_string
141 * PARAMETERS: source_desc - Source object to copy
142 * target_desc - Destination object of the copy
146 * DESCRIPTION: Copy a String object to another String object
148 ******************************************************************************/
151 acpi_ex_store_string_to_string (
152 union acpi_operand_object *source_desc,
153 union acpi_operand_object *target_desc)
159 ACPI_FUNCTION_TRACE_PTR ("ex_store_string_to_string", source_desc);
163 * We know that source_desc is a string by now.
165 buffer = (u8 *) source_desc->string.pointer;
166 length = source_desc->string.length;
169 * Replace existing string value if it will fit and the string
170 * pointer is not a static pointer (part of an ACPI table)
172 if ((length < target_desc->string.length) &&
173 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
175 * String will fit in existing non-static buffer.
176 * Clear old string and copy in the new one
178 ACPI_MEMSET (target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1);
179 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
183 * Free the current buffer, then allocate a new buffer
184 * large enough to hold the value
186 if (target_desc->string.pointer &&
187 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
189 * Only free if not a pointer into the DSDT
191 ACPI_MEM_FREE (target_desc->string.pointer);
194 target_desc->string.pointer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1);
195 if (!target_desc->string.pointer) {
196 return_ACPI_STATUS (AE_NO_MEMORY);
199 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
200 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
203 /* Set the new target length */
205 target_desc->string.length = length;
206 return_ACPI_STATUS (AE_OK);