/******************************************************************************* * * Module Name: utstrsuppt - Support functions for string-to-integer conversion * ******************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2020, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * ***************************************************************************** * * Alternatively, you may choose to be licensed under the terms of the * following license: * * 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. * * 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 MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * 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 DAMAGE. * * Alternatively, you may choose to be licensed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * *****************************************************************************/ #include #include #define _COMPONENT ACPI_UTILITIES ACPI_MODULE_NAME ("utstrsuppt") /* Local prototypes */ static ACPI_STATUS AcpiUtInsertDigit ( UINT64 *AccumulatedValue, UINT32 Base, int AsciiDigit); static ACPI_STATUS AcpiUtStrtoulMultiply64 ( UINT64 Multiplicand, UINT32 Base, UINT64 *OutProduct); static ACPI_STATUS AcpiUtStrtoulAdd64 ( UINT64 Addend1, UINT32 Digit, UINT64 *OutSum); /******************************************************************************* * * FUNCTION: AcpiUtConvertOctalString * * PARAMETERS: String - Null terminated input string * ReturnValuePtr - Where the converted value is returned * * RETURN: Status and 64-bit converted integer * * DESCRIPTION: Performs a base 8 conversion of the input string to an * integer value, either 32 or 64 bits. * * NOTE: Maximum 64-bit unsigned octal value is 01777777777777777777777 * Maximum 32-bit unsigned octal value is 037777777777 * ******************************************************************************/ ACPI_STATUS AcpiUtConvertOctalString ( char *String, UINT64 *ReturnValuePtr) { UINT64 AccumulatedValue = 0; ACPI_STATUS Status = AE_OK; /* Convert each ASCII byte in the input string */ while (*String) { /* Character must be ASCII 0-7, otherwise terminate with no error */ if (!(ACPI_IS_OCTAL_DIGIT (*String))) { break; } /* Convert and insert this octal digit into the accumulator */ Status = AcpiUtInsertDigit (&AccumulatedValue, 8, *String); if (ACPI_FAILURE (Status)) { Status = AE_OCTAL_OVERFLOW; break; } String++; } /* Always return the value that has been accumulated */ *ReturnValuePtr = AccumulatedValue; return (Status); } /******************************************************************************* * * FUNCTION: AcpiUtConvertDecimalString * * PARAMETERS: String - Null terminated input string * ReturnValuePtr - Where the converted value is returned * * RETURN: Status and 64-bit converted integer * * DESCRIPTION: Performs a base 10 conversion of the input string to an * integer value, either 32 or 64 bits. * * NOTE: Maximum 64-bit unsigned decimal value is 18446744073709551615 * Maximum 32-bit unsigned decimal value is 4294967295 * ******************************************************************************/ ACPI_STATUS AcpiUtConvertDecimalString ( char *String, UINT64 *ReturnValuePtr) { UINT64 AccumulatedValue = 0; ACPI_STATUS Status = AE_OK; /* Convert each ASCII byte in the input string */ while (*String) { /* Character must be ASCII 0-9, otherwise terminate with no error */ if (!isdigit (*String)) { break; } /* Convert and insert this decimal digit into the accumulator */ Status = AcpiUtInsertDigit (&AccumulatedValue, 10, *String); if (ACPI_FAILURE (Status)) { Status = AE_DECIMAL_OVERFLOW; break; } String++; } /* Always return the value that has been accumulated */ *ReturnValuePtr = AccumulatedValue; return (Status); } /******************************************************************************* * * FUNCTION: AcpiUtConvertHexString * * PARAMETERS: String - Null terminated input string * ReturnValuePtr - Where the converted value is returned * * RETURN: Status and 64-bit converted integer * * DESCRIPTION: Performs a base 16 conversion of the input string to an * integer value, either 32 or 64 bits. * * NOTE: Maximum 64-bit unsigned hex value is 0xFFFFFFFFFFFFFFFF * Maximum 32-bit unsigned hex value is 0xFFFFFFFF * ******************************************************************************/ ACPI_STATUS AcpiUtConvertHexString ( char *String, UINT64 *ReturnValuePtr) { UINT64 AccumulatedValue = 0; ACPI_STATUS Status = AE_OK; /* Convert each ASCII byte in the input string */ while (*String) { /* Must be ASCII A-F, a-f, or 0-9, otherwise terminate with no error */ if (!isxdigit (*String)) { break; } /* Convert and insert this hex digit into the accumulator */ Status = AcpiUtInsertDigit (&AccumulatedValue, 16, *String); if (ACPI_FAILURE (Status)) { Status = AE_HEX_OVERFLOW; break; } String++; } /* Always return the value that has been accumulated */ *ReturnValuePtr = AccumulatedValue; return (Status); } /******************************************************************************* * * FUNCTION: AcpiUtRemoveLeadingZeros * * PARAMETERS: String - Pointer to input ASCII string * * RETURN: Next character after any leading zeros. This character may be * used by the caller to detect end-of-string. * * DESCRIPTION: Remove any leading zeros in the input string. Return the * next character after the final ASCII zero to enable the caller * to check for the end of the string (NULL terminator). * ******************************************************************************/ char AcpiUtRemoveLeadingZeros ( char **String) { while (**String == ACPI_ASCII_ZERO) { *String += 1; } return (**String); } /******************************************************************************* * * FUNCTION: AcpiUtRemoveWhitespace * * PARAMETERS: String - Pointer to input ASCII string * * RETURN: Next character after any whitespace. This character may be * used by the caller to detect end-of-string. * * DESCRIPTION: Remove any leading whitespace in the input string. Return the * next character after the final ASCII zero to enable the caller * to check for the end of the string (NULL terminator). * ******************************************************************************/ char AcpiUtRemoveWhitespace ( char **String) { while (isspace ((UINT8) **String)) { *String += 1; } return (**String); } /******************************************************************************* * * FUNCTION: AcpiUtDetectHexPrefix * * PARAMETERS: String - Pointer to input ASCII string * * RETURN: TRUE if a "0x" prefix was found at the start of the string * * DESCRIPTION: Detect and remove a hex "0x" prefix * ******************************************************************************/ BOOLEAN AcpiUtDetectHexPrefix ( char **String) { char *InitialPosition = *String; AcpiUtRemoveHexPrefix (String); if (*String != InitialPosition) { return (TRUE); /* String is past leading 0x */ } return (FALSE); /* Not a hex string */ } /******************************************************************************* * * FUNCTION: AcpiUtRemoveHexPrefix * * PARAMETERS: String - Pointer to input ASCII string * * RETURN: none * * DESCRIPTION: Remove a hex "0x" prefix * ******************************************************************************/ void AcpiUtRemoveHexPrefix ( char **String) { if ((**String == ACPI_ASCII_ZERO) && (tolower ((int) *(*String + 1)) == 'x')) { *String += 2; /* Go past the leading 0x */ } } /******************************************************************************* * * FUNCTION: AcpiUtDetectOctalPrefix * * PARAMETERS: String - Pointer to input ASCII string * * RETURN: True if an octal "0" prefix was found at the start of the * string * * DESCRIPTION: Detect and remove an octal prefix (zero) * ******************************************************************************/ BOOLEAN AcpiUtDetectOctalPrefix ( char **String) { if (**String == ACPI_ASCII_ZERO) { *String += 1; /* Go past the leading 0 */ return (TRUE); } return (FALSE); /* Not an octal string */ } /******************************************************************************* * * FUNCTION: AcpiUtInsertDigit * * PARAMETERS: AccumulatedValue - Current value of the integer value * accumulator. The new value is * returned here. * Base - Radix, either 8/10/16 * AsciiDigit - ASCII single digit to be inserted * * RETURN: Status and result of the convert/insert operation. The only * possible returned exception code is numeric overflow of * either the multiply or add conversion operations. * * DESCRIPTION: Generic conversion and insertion function for all bases: * * 1) Multiply the current accumulated/converted value by the * base in order to make room for the new character. * * 2) Convert the new character to binary and add it to the * current accumulated value. * * Note: The only possible exception indicates an integer * overflow (AE_NUMERIC_OVERFLOW) * ******************************************************************************/ static ACPI_STATUS AcpiUtInsertDigit ( UINT64 *AccumulatedValue, UINT32 Base, int AsciiDigit) { ACPI_STATUS Status; UINT64 Product; /* Make room in the accumulated value for the incoming digit */ Status = AcpiUtStrtoulMultiply64 (*AccumulatedValue, Base, &Product); if (ACPI_FAILURE (Status)) { return (Status); } /* Add in the new digit, and store the sum to the accumulated value */ Status = AcpiUtStrtoulAdd64 (Product, AcpiUtAsciiCharToHex (AsciiDigit), AccumulatedValue); return (Status); } /******************************************************************************* * * FUNCTION: AcpiUtStrtoulMultiply64 * * PARAMETERS: Multiplicand - Current accumulated converted integer * Base - Base/Radix * OutProduct - Where the product is returned * * RETURN: Status and 64-bit product * * DESCRIPTION: Multiply two 64-bit values, with checking for 64-bit overflow as * well as 32-bit overflow if necessary (if the current global * integer width is 32). * ******************************************************************************/ static ACPI_STATUS AcpiUtStrtoulMultiply64 ( UINT64 Multiplicand, UINT32 Base, UINT64 *OutProduct) { UINT64 Product; UINT64 Quotient; /* Exit if either operand is zero */ *OutProduct = 0; if (!Multiplicand || !Base) { return (AE_OK); } /* * Check for 64-bit overflow before the actual multiplication. * * Notes: 64-bit division is often not supported on 32-bit platforms * (it requires a library function), Therefore ACPICA has a local * 64-bit divide function. Also, Multiplier is currently only used * as the radix (8/10/16), to the 64/32 divide will always work. */ AcpiUtShortDivide (ACPI_UINT64_MAX, Base, &Quotient, NULL); if (Multiplicand > Quotient) { return (AE_NUMERIC_OVERFLOW); } Product = Multiplicand * Base; /* Check for 32-bit overflow if necessary */ if ((AcpiGbl_IntegerBitWidth == 32) && (Product > ACPI_UINT32_MAX)) { return (AE_NUMERIC_OVERFLOW); } *OutProduct = Product; return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiUtStrtoulAdd64 * * PARAMETERS: Addend1 - Current accumulated converted integer * Digit - New hex value/char * OutSum - Where sum is returned (Accumulator) * * RETURN: Status and 64-bit sum * * DESCRIPTION: Add two 64-bit values, with checking for 64-bit overflow as * well as 32-bit overflow if necessary (if the current global * integer width is 32). * ******************************************************************************/ static ACPI_STATUS AcpiUtStrtoulAdd64 ( UINT64 Addend1, UINT32 Digit, UINT64 *OutSum) { UINT64 Sum; /* Check for 64-bit overflow before the actual addition */ if ((Addend1 > 0) && (Digit > (ACPI_UINT64_MAX - Addend1))) { return (AE_NUMERIC_OVERFLOW); } Sum = Addend1 + Digit; /* Check for 32-bit overflow if necessary */ if ((AcpiGbl_IntegerBitWidth == 32) && (Sum > ACPI_UINT32_MAX)) { return (AE_NUMERIC_OVERFLOW); } *OutSum = Sum; return (AE_OK); }