328 lines
12 KiB
C
328 lines
12 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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*
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* Module Name: utstrtoul64 - String-to-integer conversion support for both
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* 64-bit and 32-bit integers
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*
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******************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#define _COMPONENT ACPI_UTILITIES
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ACPI_MODULE_NAME("utstrtoul64")
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/*******************************************************************************
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*
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* This module contains the top-level string to 64/32-bit unsigned integer
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* conversion functions:
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*
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* 1) A standard strtoul() function that supports 64-bit integers, base
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* 8/10/16, with integer overflow support. This is used mainly by the
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* iASL compiler, which implements tighter constraints on integer
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* constants than the runtime (interpreter) integer-to-string conversions.
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* 2) Runtime "Explicit conversion" as defined in the ACPI specification.
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* 3) Runtime "Implicit conversion" as defined in the ACPI specification.
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*
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* Current users of this module:
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*
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* iASL - Preprocessor (constants and math expressions)
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* iASL - Main parser, conversion of constants to integers
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* iASL - Data Table Compiler parser (constants and math expressions)
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* interpreter - Implicit and explicit conversions, GPE method names
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* interpreter - Repair code for return values from predefined names
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* debugger - Command line input string conversion
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* acpi_dump - ACPI table physical addresses
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* acpi_exec - Support for namespace overrides
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*
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* Notes concerning users of these interfaces:
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*
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* acpi_gbl_integer_byte_width is used to set the 32/64 bit limit for explicit
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* and implicit conversions. This global must be set to the proper width.
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* For the core ACPICA code, the width depends on the DSDT version. For the
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* acpi_ut_strtoul64 interface, all conversions are 64 bits. This interface is
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* used primarily for iASL, where the default width is 64 bits for all parsers,
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* but error checking is performed later to flag cases where a 64-bit constant
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* is wrongly defined in a 32-bit DSDT/SSDT.
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*
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* In ACPI, the only place where octal numbers are supported is within
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* the ASL language itself. This is implemented via the main acpi_ut_strtoul64
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* interface. According the ACPI specification, there is no ACPI runtime
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* support (explicit/implicit) for octal string conversions.
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*
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******************************************************************************/
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_strtoul64
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*
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* PARAMETERS: string - Null terminated input string,
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* must be a valid pointer
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* return_value - Where the converted integer is
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* returned. Must be a valid pointer
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*
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* RETURN: Status and converted integer. Returns an exception on a
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* 64-bit numeric overflow
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*
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* DESCRIPTION: Convert a string into an unsigned integer. Always performs a
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* full 64-bit conversion, regardless of the current global
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* integer width. Supports Decimal, Hex, and Octal strings.
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*
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* Current users of this function:
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*
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* iASL - Preprocessor (constants and math expressions)
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* iASL - Main ASL parser, conversion of ASL constants to integers
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* iASL - Data Table Compiler parser (constants and math expressions)
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* interpreter - Repair code for return values from predefined names
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* acpi_dump - ACPI table physical addresses
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* acpi_exec - Support for namespace overrides
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*
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******************************************************************************/
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acpi_status acpi_ut_strtoul64(char *string, u64 *return_value)
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{
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acpi_status status = AE_OK;
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u8 original_bit_width;
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u32 base = 10; /* Default is decimal */
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ACPI_FUNCTION_TRACE_STR(ut_strtoul64, string);
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*return_value = 0;
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/* A NULL return string returns a value of zero */
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if (*string == 0) {
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return_ACPI_STATUS(AE_OK);
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}
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if (!acpi_ut_remove_whitespace(&string)) {
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* 1) Check for a hex constant. A "0x" prefix indicates base 16.
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*/
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if (acpi_ut_detect_hex_prefix(&string)) {
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base = 16;
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}
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/*
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* 2) Check for an octal constant, defined to be a leading zero
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* followed by sequence of octal digits (0-7)
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*/
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else if (acpi_ut_detect_octal_prefix(&string)) {
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base = 8;
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}
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if (!acpi_ut_remove_leading_zeros(&string)) {
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return_ACPI_STATUS(AE_OK); /* Return value 0 */
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}
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/*
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* Force a full 64-bit conversion. The caller (usually iASL) must
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* check for a 32-bit overflow later as necessary (If current mode
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* is 32-bit, meaning a 32-bit DSDT).
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*/
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original_bit_width = acpi_gbl_integer_bit_width;
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acpi_gbl_integer_bit_width = 64;
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/*
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* Perform the base 8, 10, or 16 conversion. A 64-bit numeric overflow
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* will return an exception (to allow iASL to flag the statement).
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*/
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switch (base) {
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case 8:
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status = acpi_ut_convert_octal_string(string, return_value);
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break;
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case 10:
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status = acpi_ut_convert_decimal_string(string, return_value);
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break;
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case 16:
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default:
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status = acpi_ut_convert_hex_string(string, return_value);
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break;
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}
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/* Only possible exception from above is a 64-bit overflow */
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acpi_gbl_integer_bit_width = original_bit_width;
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_implicit_strtoul64
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*
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* PARAMETERS: string - Null terminated input string,
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* must be a valid pointer
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*
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* RETURN: Converted integer
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*
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* DESCRIPTION: Perform a 64-bit conversion with restrictions placed upon
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* an "implicit conversion" by the ACPI specification. Used by
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* many ASL operators that require an integer operand, and support
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* an automatic (implicit) conversion from a string operand
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* to the final integer operand. The major restriction is that
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* only hex strings are supported.
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*
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* -----------------------------------------------------------------------------
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*
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* Base is always 16, either with or without the 0x prefix. Decimal and
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* Octal strings are not supported, as per the ACPI specification.
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*
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* Examples (both are hex values):
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* Add ("BA98", Arg0, Local0)
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* Subtract ("0x12345678", Arg1, Local1)
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*
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* Conversion rules as extracted from the ACPI specification:
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*
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* The converted integer is initialized to the value zero.
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* The ASCII string is always interpreted as a hexadecimal constant.
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*
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* 1) According to the ACPI specification, a "0x" prefix is not allowed.
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* However, ACPICA allows this as an ACPI extension on general
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* principle. (NO ERROR)
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*
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* 2) The conversion terminates when the size of an integer is reached
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* (32 or 64 bits). There are no numeric overflow conditions. (NO ERROR)
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*
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* 3) The first non-hex character terminates the conversion and returns
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* the current accumulated value of the converted integer (NO ERROR).
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*
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* 4) Conversion of a null (zero-length) string to an integer is
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* technically not allowed. However, ACPICA allows this as an ACPI
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* extension. The conversion returns the value 0. (NO ERROR)
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*
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* NOTE: There are no error conditions returned by this function. At
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* the minimum, a value of zero is returned.
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*
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* Current users of this function:
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*
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* interpreter - All runtime implicit conversions, as per ACPI specification
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* iASL - Data Table Compiler parser (constants and math expressions)
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*
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******************************************************************************/
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u64 acpi_ut_implicit_strtoul64(char *string)
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{
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u64 converted_integer = 0;
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ACPI_FUNCTION_TRACE_STR(ut_implicit_strtoul64, string);
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if (!acpi_ut_remove_whitespace(&string)) {
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return_VALUE(0);
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}
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/*
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* Per the ACPI specification, only hexadecimal is supported for
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* implicit conversions, and the "0x" prefix is "not allowed".
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* However, allow a "0x" prefix as an ACPI extension.
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*/
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acpi_ut_remove_hex_prefix(&string);
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if (!acpi_ut_remove_leading_zeros(&string)) {
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return_VALUE(0);
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}
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/*
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* Ignore overflow as per the ACPI specification. This is implemented by
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* ignoring the return status from the conversion function called below.
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* On overflow, the input string is simply truncated.
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*/
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acpi_ut_convert_hex_string(string, &converted_integer);
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return_VALUE(converted_integer);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_explicit_strtoul64
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*
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* PARAMETERS: string - Null terminated input string,
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* must be a valid pointer
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*
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* RETURN: Converted integer
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*
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* DESCRIPTION: Perform a 64-bit conversion with the restrictions placed upon
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* an "explicit conversion" by the ACPI specification. The
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* main restriction is that only hex and decimal are supported.
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*
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* -----------------------------------------------------------------------------
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*
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* Base is either 10 (default) or 16 (with 0x prefix). Octal (base 8) strings
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* are not supported, as per the ACPI specification.
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*
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* Examples:
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* to_integer ("1000") Decimal
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* to_integer ("0xABCD") Hex
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*
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* Conversion rules as extracted from the ACPI specification:
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*
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* 1) The input string is either a decimal or hexadecimal numeric string.
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* A hex value must be prefixed by "0x" or it is interpreted as decimal.
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*
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* 2) The value must not exceed the maximum of an integer value
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* (32 or 64 bits). The ACPI specification states the behavior is
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* "unpredictable", so ACPICA matches the behavior of the implicit
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* conversion case. There are no numeric overflow conditions. (NO ERROR)
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*
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* 3) Behavior on the first non-hex character is not defined by the ACPI
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* specification (for the to_integer operator), so ACPICA matches the
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* behavior of the implicit conversion case. It terminates the
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* conversion and returns the current accumulated value of the converted
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* integer. (NO ERROR)
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*
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* 4) Conversion of a null (zero-length) string to an integer is
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* technically not allowed. However, ACPICA allows this as an ACPI
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* extension. The conversion returns the value 0. (NO ERROR)
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*
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* NOTE: There are no error conditions returned by this function. At the
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* minimum, a value of zero is returned.
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*
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* Current users of this function:
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*
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* interpreter - Runtime ASL to_integer operator, as per the ACPI specification
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*
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******************************************************************************/
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u64 acpi_ut_explicit_strtoul64(char *string)
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{
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u64 converted_integer = 0;
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u32 base = 10; /* Default is decimal */
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ACPI_FUNCTION_TRACE_STR(ut_explicit_strtoul64, string);
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if (!acpi_ut_remove_whitespace(&string)) {
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return_VALUE(0);
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}
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/*
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* Only Hex and Decimal are supported, as per the ACPI specification.
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* A "0x" prefix indicates hex; otherwise decimal is assumed.
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*/
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if (acpi_ut_detect_hex_prefix(&string)) {
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base = 16;
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}
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if (!acpi_ut_remove_leading_zeros(&string)) {
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return_VALUE(0);
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}
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/*
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* Ignore overflow as per the ACPI specification. This is implemented by
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* ignoring the return status from the conversion functions called below.
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* On overflow, the input string is simply truncated.
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*/
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switch (base) {
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case 10:
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default:
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acpi_ut_convert_decimal_string(string, &converted_integer);
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break;
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case 16:
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acpi_ut_convert_hex_string(string, &converted_integer);
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break;
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}
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return_VALUE(converted_integer);
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}
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