1 /*******************************************************************************
2 *
3 * Module Name: utstrtoul64 - String-to-integer conversion support for both
4 * 64-bit and 32-bit integers
5 *
6 ******************************************************************************/
7
8 /******************************************************************************
9 *
10 * 1. Copyright Notice
11 *
12 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
13 * All rights reserved.
14 *
15 * 2. License
16 *
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
20 * property rights.
21 *
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
28 *
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
37 *
38 * The above copyright and patent license is granted only if the following
39 * conditions are met:
40 *
41 * 3. Conditions
42 *
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
54 *
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
65 * make.
66 *
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3.4. Intel retains all right, title, and interest in and to the Original
74 * Intel Code.
75 *
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
80 *
81 * 4. Disclaimer and Export Compliance
82 *
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
89 * PARTICULAR PURPOSE.
90 *
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
98 * LIMITED REMEDY.
99 *
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
114 *
115 *****************************************************************************
116 *
117 * Alternatively, you may choose to be licensed under the terms of the
118 * following license:
119 *
120 * Redistribution and use in source and binary forms, with or without
121 * modification, are permitted provided that the following conditions
122 * are met:
123 * 1. Redistributions of source code must retain the above copyright
124 * notice, this list of conditions, and the following disclaimer,
125 * without modification.
126 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
127 * substantially similar to the "NO WARRANTY" disclaimer below
128 * ("Disclaimer") and any redistribution must be conditioned upon
129 * including a substantially similar Disclaimer requirement for further
130 * binary redistribution.
131 * 3. Neither the names of the above-listed copyright holders nor the names
132 * of any contributors may be used to endorse or promote products derived
133 * from this software without specific prior written permission.
134 *
135 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
138 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
139 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
140 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
141 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
142 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
143 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
144 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
145 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 *
147 * Alternatively, you may choose to be licensed under the terms of the
148 * GNU General Public License ("GPL") version 2 as published by the Free
149 * Software Foundation.
150 *
151 *****************************************************************************/
152
153 #include "acpi.h"
154 #include "accommon.h"
155
156 #define _COMPONENT ACPI_UTILITIES
157 ACPI_MODULE_NAME ("utstrtoul64")
158
159
160 /*******************************************************************************
161 *
162 * This module contains the top-level string to 64/32-bit unsigned integer
163 * conversion functions:
164 *
165 * 1) A standard strtoul() function that supports 64-bit integers, base
166 * 8/10/16, with integer overflow support. This is used mainly by the
167 * iASL compiler, which implements tighter constraints on integer
168 * constants than the runtime (interpreter) integer-to-string conversions.
169 * 2) Runtime "Explicit conversion" as defined in the ACPI specification.
170 * 3) Runtime "Implicit conversion" as defined in the ACPI specification.
171 *
172 * Current users of this module:
173 *
174 * iASL - Preprocessor (constants and math expressions)
175 * iASL - Main parser, conversion of constants to integers
176 * iASL - Data Table Compiler parser (constants and math expressions)
177 * Interpreter - Implicit and explicit conversions, GPE method names
178 * Interpreter - Repair code for return values from predefined names
179 * Debugger - Command line input string conversion
180 * AcpiDump - ACPI table physical addresses
181 * AcpiExec - Support for namespace overrides
182 *
183 * Notes concerning users of these interfaces:
184 *
185 * AcpiGbl_IntegerByteWidth is used to set the 32/64 bit limit for explicit
186 * and implicit conversions. This global must be set to the proper width.
187 * For the core ACPICA code, the width depends on the DSDT version. For the
188 * AcpiUtStrtoul64 interface, all conversions are 64 bits. This interface is
189 * used primarily for iASL, where the default width is 64 bits for all parsers,
190 * but error checking is performed later to flag cases where a 64-bit constant
191 * is wrongly defined in a 32-bit DSDT/SSDT.
192 *
193 * In ACPI, the only place where octal numbers are supported is within
194 * the ASL language itself. This is implemented via the main AcpiUtStrtoul64
195 * interface. According the ACPI specification, there is no ACPI runtime
196 * support (explicit/implicit) for octal string conversions.
197 *
198 ******************************************************************************/
199
200
201 /*******************************************************************************
202 *
203 * FUNCTION: AcpiUtStrtoul64
204 *
205 * PARAMETERS: String - Null terminated input string,
206 * must be a valid pointer
207 * ReturnValue - Where the converted integer is
208 * returned. Must be a valid pointer
209 *
210 * RETURN: Status and converted integer. Returns an exception on a
211 * 64-bit numeric overflow
212 *
213 * DESCRIPTION: Convert a string into an unsigned integer. Always performs a
214 * full 64-bit conversion, regardless of the current global
215 * integer width. Supports Decimal, Hex, and Octal strings.
216 *
217 * Current users of this function:
218 *
219 * iASL - Preprocessor (constants and math expressions)
220 * iASL - Main ASL parser, conversion of ASL constants to integers
221 * iASL - Data Table Compiler parser (constants and math expressions)
222 * Interpreter - Repair code for return values from predefined names
223 * AcpiDump - ACPI table physical addresses
224 * AcpiExec - Support for namespace overrides
225 *
226 ******************************************************************************/
227
228 ACPI_STATUS
AcpiUtStrtoul64(char * String,UINT64 * ReturnValue)229 AcpiUtStrtoul64 (
230 char *String,
231 UINT64 *ReturnValue)
232 {
233 ACPI_STATUS Status = AE_OK;
234 UINT8 OriginalBitWidth;
235 UINT32 Base = 10; /* Default is decimal */
236
237
238 ACPI_FUNCTION_TRACE_STR (UtStrtoul64, String);
239
240
241 *ReturnValue = 0;
242
243 /* A NULL return string returns a value of zero */
244
245 if (*String == 0)
246 {
247 return_ACPI_STATUS (AE_OK);
248 }
249
250 if (!AcpiUtRemoveWhitespace (&String))
251 {
252 return_ACPI_STATUS (AE_OK);
253 }
254
255 /*
256 * 1) Check for a hex constant. A "0x" prefix indicates base 16.
257 */
258 if (AcpiUtDetectHexPrefix (&String))
259 {
260 Base = 16;
261 }
262
263 /*
264 * 2) Check for an octal constant, defined to be a leading zero
265 * followed by sequence of octal digits (0-7)
266 */
267 else if (AcpiUtDetectOctalPrefix (&String))
268 {
269 Base = 8;
270 }
271
272 if (!AcpiUtRemoveLeadingZeros (&String))
273 {
274 return_ACPI_STATUS (AE_OK); /* Return value 0 */
275 }
276
277 /*
278 * Force a full 64-bit conversion. The caller (usually iASL) must
279 * check for a 32-bit overflow later as necessary (If current mode
280 * is 32-bit, meaning a 32-bit DSDT).
281 */
282 OriginalBitWidth = AcpiGbl_IntegerBitWidth;
283 AcpiGbl_IntegerBitWidth = 64;
284
285 /*
286 * Perform the base 8, 10, or 16 conversion. A 64-bit numeric overflow
287 * will return an exception (to allow iASL to flag the statement).
288 */
289 switch (Base)
290 {
291 case 8:
292 Status = AcpiUtConvertOctalString (String, ReturnValue);
293 break;
294
295 case 10:
296 Status = AcpiUtConvertDecimalString (String, ReturnValue);
297 break;
298
299 case 16:
300 default:
301 Status = AcpiUtConvertHexString (String, ReturnValue);
302 break;
303 }
304
305 /* Only possible exception from above is a 64-bit overflow */
306
307 AcpiGbl_IntegerBitWidth = OriginalBitWidth;
308 return_ACPI_STATUS (Status);
309 }
310
311
312 /*******************************************************************************
313 *
314 * FUNCTION: AcpiUtImplicitStrtoul64
315 *
316 * PARAMETERS: String - Null terminated input string,
317 * must be a valid pointer
318 *
319 * RETURN: Converted integer
320 *
321 * DESCRIPTION: Perform a 64-bit conversion with restrictions placed upon
322 * an "implicit conversion" by the ACPI specification. Used by
323 * many ASL operators that require an integer operand, and support
324 * an automatic (implicit) conversion from a string operand
325 * to the final integer operand. The major restriction is that
326 * only hex strings are supported.
327 *
328 * -----------------------------------------------------------------------------
329 *
330 * Base is always 16, either with or without the 0x prefix. Decimal and
331 * Octal strings are not supported, as per the ACPI specification.
332 *
333 * Examples (both are hex values):
334 * Add ("BA98", Arg0, Local0)
335 * Subtract ("0x12345678", Arg1, Local1)
336 *
337 * Conversion rules as extracted from the ACPI specification:
338 *
339 * The converted integer is initialized to the value zero.
340 * The ASCII string is always interpreted as a hexadecimal constant.
341 *
342 * 1) According to the ACPI specification, a "0x" prefix is not allowed.
343 * However, ACPICA allows this as an ACPI extension on general
344 * principle. (NO ERROR)
345 *
346 * 2) The conversion terminates when the size of an integer is reached
347 * (32 or 64 bits). There are no numeric overflow conditions. (NO ERROR)
348 *
349 * 3) The first non-hex character terminates the conversion and returns
350 * the current accumulated value of the converted integer (NO ERROR).
351 *
352 * 4) Conversion of a null (zero-length) string to an integer is
353 * technically not allowed. However, ACPICA allows this as an ACPI
354 * extension. The conversion returns the value 0. (NO ERROR)
355 *
356 * NOTE: There are no error conditions returned by this function. At
357 * the minimum, a value of zero is returned.
358 *
359 * Current users of this function:
360 *
361 * Interpreter - All runtime implicit conversions, as per ACPI specification
362 * iASL - Data Table Compiler parser (constants and math expressions)
363 *
364 ******************************************************************************/
365
366 UINT64
AcpiUtImplicitStrtoul64(char * String)367 AcpiUtImplicitStrtoul64 (
368 char *String)
369 {
370 UINT64 ConvertedInteger = 0;
371
372
373 ACPI_FUNCTION_TRACE_STR (UtImplicitStrtoul64, String);
374
375
376 if (!AcpiUtRemoveWhitespace (&String))
377 {
378 return_VALUE (0);
379 }
380
381 /*
382 * Per the ACPI specification, only hexadecimal is supported for
383 * implicit conversions, and the "0x" prefix is "not allowed".
384 * However, allow a "0x" prefix as an ACPI extension.
385 */
386 AcpiUtDetectHexPrefix (&String);
387
388 if (!AcpiUtRemoveLeadingZeros (&String))
389 {
390 return_VALUE (0);
391 }
392
393 /*
394 * Ignore overflow as per the ACPI specification. This is implemented by
395 * ignoring the return status from the conversion function called below.
396 * On overflow, the input string is simply truncated.
397 */
398 AcpiUtConvertHexString (String, &ConvertedInteger);
399 return_VALUE (ConvertedInteger);
400 }
401
402
403 /*******************************************************************************
404 *
405 * FUNCTION: AcpiUtExplicitStrtoul64
406 *
407 * PARAMETERS: String - Null terminated input string,
408 * must be a valid pointer
409 *
410 * RETURN: Converted integer
411 *
412 * DESCRIPTION: Perform a 64-bit conversion with the restrictions placed upon
413 * an "explicit conversion" by the ACPI specification. The
414 * main restriction is that only hex and decimal are supported.
415 *
416 * -----------------------------------------------------------------------------
417 *
418 * Base is either 10 (default) or 16 (with 0x prefix). Octal (base 8) strings
419 * are not supported, as per the ACPI specification.
420 *
421 * Examples:
422 * ToInteger ("1000") Decimal
423 * ToInteger ("0xABCD") Hex
424 *
425 * Conversion rules as extracted from the ACPI specification:
426 *
427 * 1) The input string is either a decimal or hexadecimal numeric string.
428 * A hex value must be prefixed by "0x" or it is interpreted as decimal.
429 *
430 * 2) The value must not exceed the maximum of an integer value
431 * (32 or 64 bits). The ACPI specification states the behavior is
432 * "unpredictable", so ACPICA matches the behavior of the implicit
433 * conversion case. There are no numeric overflow conditions. (NO ERROR)
434 *
435 * 3) Behavior on the first non-hex character is not defined by the ACPI
436 * specification (for the ToInteger operator), so ACPICA matches the
437 * behavior of the implicit conversion case. It terminates the
438 * conversion and returns the current accumulated value of the converted
439 * integer. (NO ERROR)
440 *
441 * 4) Conversion of a null (zero-length) string to an integer is
442 * technically not allowed. However, ACPICA allows this as an ACPI
443 * extension. The conversion returns the value 0. (NO ERROR)
444 *
445 * NOTE: There are no error conditions returned by this function. At the
446 * minimum, a value of zero is returned.
447 *
448 * Current users of this function:
449 *
450 * Interpreter - Runtime ASL ToInteger operator, as per the ACPI specification
451 *
452 ******************************************************************************/
453
454 UINT64
AcpiUtExplicitStrtoul64(char * String)455 AcpiUtExplicitStrtoul64 (
456 char *String)
457 {
458 UINT64 ConvertedInteger = 0;
459 UINT32 Base = 10; /* Default is decimal */
460
461
462 ACPI_FUNCTION_TRACE_STR (UtExplicitStrtoul64, String);
463
464
465 if (!AcpiUtRemoveWhitespace (&String))
466 {
467 return_VALUE (0);
468 }
469
470 /*
471 * Only Hex and Decimal are supported, as per the ACPI specification.
472 * A "0x" prefix indicates hex; otherwise decimal is assumed.
473 */
474 if (AcpiUtDetectHexPrefix (&String))
475 {
476 Base = 16;
477 }
478
479 if (!AcpiUtRemoveLeadingZeros (&String))
480 {
481 return_VALUE (0);
482 }
483
484 /*
485 * Ignore overflow as per the ACPI specification. This is implemented by
486 * ignoring the return status from the conversion functions called below.
487 * On overflow, the input string is simply truncated.
488 */
489 switch (Base)
490 {
491 case 10:
492 default:
493 AcpiUtConvertDecimalString (String, &ConvertedInteger);
494 break;
495
496 case 16:
497 AcpiUtConvertHexString (String, &ConvertedInteger);
498 break;
499 }
500
501 return_VALUE (ConvertedInteger);
502 }
503