mirror of https://gitee.com/openkylin/linux.git
556 lines
13 KiB
C
556 lines
13 KiB
C
/*******************************************************************************
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*
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* Module Name: utnonansi - Non-ansi C library functions
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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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("utnonansi")
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/*
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* Non-ANSI C library functions - strlwr, strupr, stricmp, and a 64-bit
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* version of strtoul.
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*/
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_strlwr (strlwr)
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*
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* PARAMETERS: src_string - The source string to convert
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*
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* RETURN: None
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*
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* DESCRIPTION: Convert a string to lowercase
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*
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******************************************************************************/
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void acpi_ut_strlwr(char *src_string)
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{
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char *string;
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ACPI_FUNCTION_ENTRY();
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if (!src_string) {
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return;
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}
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/* Walk entire string, lowercasing the letters */
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for (string = src_string; *string; string++) {
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*string = (char)tolower((int)*string);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_strupr (strupr)
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*
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* PARAMETERS: src_string - The source string to convert
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*
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* RETURN: None
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*
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* DESCRIPTION: Convert a string to uppercase
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*
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******************************************************************************/
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void acpi_ut_strupr(char *src_string)
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{
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char *string;
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ACPI_FUNCTION_ENTRY();
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if (!src_string) {
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return;
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}
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/* Walk entire string, uppercasing the letters */
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for (string = src_string; *string; string++) {
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*string = (char)toupper((int)*string);
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}
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_ut_stricmp (stricmp)
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*
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* PARAMETERS: string1 - first string to compare
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* string2 - second string to compare
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*
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* RETURN: int that signifies string relationship. Zero means strings
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* are equal.
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*
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* DESCRIPTION: Case-insensitive string compare. Implementation of the
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* non-ANSI stricmp function.
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*
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******************************************************************************/
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int acpi_ut_stricmp(char *string1, char *string2)
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{
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int c1;
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int c2;
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do {
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c1 = tolower((int)*string1);
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c2 = tolower((int)*string2);
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string1++;
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string2++;
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}
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while ((c1 == c2) && (c1));
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return (c1 - c2);
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}
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#if defined (ACPI_DEBUGGER) || defined (ACPI_APPLICATION)
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_safe_strcpy, acpi_ut_safe_strcat, acpi_ut_safe_strncat
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*
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* PARAMETERS: Adds a "DestSize" parameter to each of the standard string
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* functions. This is the size of the Destination buffer.
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*
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* RETURN: TRUE if the operation would overflow the destination buffer.
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*
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* DESCRIPTION: Safe versions of standard Clib string functions. Ensure that
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* the result of the operation will not overflow the output string
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* buffer.
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*
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* NOTE: These functions are typically only helpful for processing
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* user input and command lines. For most ACPICA code, the
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* required buffer length is precisely calculated before buffer
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* allocation, so the use of these functions is unnecessary.
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*
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******************************************************************************/
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u8 acpi_ut_safe_strcpy(char *dest, acpi_size dest_size, char *source)
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{
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if (strlen(source) >= dest_size) {
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return (TRUE);
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}
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strcpy(dest, source);
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return (FALSE);
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}
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u8 acpi_ut_safe_strcat(char *dest, acpi_size dest_size, char *source)
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{
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if ((strlen(dest) + strlen(source)) >= dest_size) {
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return (TRUE);
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}
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strcat(dest, source);
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return (FALSE);
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}
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u8
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acpi_ut_safe_strncat(char *dest,
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acpi_size dest_size,
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char *source, acpi_size max_transfer_length)
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{
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acpi_size actual_transfer_length;
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actual_transfer_length = ACPI_MIN(max_transfer_length, strlen(source));
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if ((strlen(dest) + actual_transfer_length) >= dest_size) {
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return (TRUE);
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}
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strncat(dest, source, max_transfer_length);
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return (FALSE);
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}
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#endif
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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 string
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* base - Radix of the string: 16 or 10 or
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* ACPI_ANY_BASE
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* max_integer_byte_width - Maximum allowable integer,in bytes:
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* 4 or 8 (32 or 64 bits)
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* ret_integer - Where the converted integer is
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* returned
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*
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* RETURN: Status and Converted value
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*
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* DESCRIPTION: Convert a string into an unsigned value. Performs either a
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* 32-bit or 64-bit conversion, depending on the input integer
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* size (often the current mode of the interpreter).
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*
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* NOTES: Negative numbers are not supported, as they are not supported
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* by ACPI.
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*
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* acpi_gbl_integer_byte_width should be set to the proper width.
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* For the core ACPICA code, this width depends on the DSDT
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* version. For iASL, the default byte width is always 8 for the
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* parser, but error checking is performed later to flag cases
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* where a 64-bit constant is defined in a 32-bit DSDT/SSDT.
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*
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* Does not support Octal strings, not needed at this time.
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*
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******************************************************************************/
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acpi_status
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acpi_ut_strtoul64(char *string,
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u32 base, u32 max_integer_byte_width, u64 *ret_integer)
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{
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u32 this_digit = 0;
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u64 return_value = 0;
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u64 quotient;
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u64 dividend;
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u8 valid_digits = 0;
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u8 sign_of0x = 0;
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u8 term = 0;
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ACPI_FUNCTION_TRACE_STR(ut_strtoul64, string);
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switch (base) {
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case ACPI_ANY_BASE:
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case 10:
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case 16:
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break;
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default:
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/* Invalid Base */
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (!string) {
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goto error_exit;
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}
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/* Skip over any white space in the buffer */
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while ((*string) && (isspace((int)*string) || *string == '\t')) {
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string++;
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}
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if (base == ACPI_ANY_BASE) {
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/*
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* Base equal to ACPI_ANY_BASE means 'Either decimal or hex'.
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* We need to determine if it is decimal or hexadecimal.
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*/
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if ((*string == '0') && (tolower((int)*(string + 1)) == 'x')) {
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sign_of0x = 1;
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base = 16;
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/* Skip over the leading '0x' */
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string += 2;
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} else {
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base = 10;
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}
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}
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/* Any string left? Check that '0x' is not followed by white space. */
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if (!(*string) || isspace((int)*string) || *string == '\t') {
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if (base == ACPI_ANY_BASE) {
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goto error_exit;
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} else {
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goto all_done;
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}
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}
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/*
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* Perform a 32-bit or 64-bit conversion, depending upon the input
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* byte width
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*/
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dividend = (max_integer_byte_width <= ACPI_MAX32_BYTE_WIDTH) ?
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ACPI_UINT32_MAX : ACPI_UINT64_MAX;
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/* Main loop: convert the string to a 32- or 64-bit integer */
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while (*string) {
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if (isdigit((int)*string)) {
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/* Convert ASCII 0-9 to Decimal value */
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this_digit = ((u8)*string) - '0';
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} else if (base == 10) {
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/* Digit is out of range; possible in to_integer case only */
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term = 1;
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} else {
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this_digit = (u8)toupper((int)*string);
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if (isxdigit((int)this_digit)) {
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/* Convert ASCII Hex char to value */
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this_digit = this_digit - 'A' + 10;
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} else {
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term = 1;
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}
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}
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if (term) {
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if (base == ACPI_ANY_BASE) {
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goto error_exit;
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} else {
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break;
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}
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} else if ((valid_digits == 0) && (this_digit == 0)
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&& !sign_of0x) {
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/* Skip zeros */
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string++;
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continue;
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}
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valid_digits++;
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if (sign_of0x && ((valid_digits > 16) ||
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((valid_digits > 8)
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&& (max_integer_byte_width <=
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ACPI_MAX32_BYTE_WIDTH)))) {
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/*
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* This is to_integer operation case.
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* No restrictions for string-to-integer conversion,
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* see ACPI spec.
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*/
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goto error_exit;
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}
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/* Divide the digit into the correct position */
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(void)acpi_ut_short_divide((dividend - (u64)this_digit), base,
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"ient, NULL);
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if (return_value > quotient) {
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if (base == ACPI_ANY_BASE) {
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goto error_exit;
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} else {
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break;
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}
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}
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return_value *= base;
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return_value += this_digit;
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string++;
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}
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/* All done, normal exit */
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all_done:
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
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ACPI_FORMAT_UINT64(return_value)));
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*ret_integer = return_value;
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return_ACPI_STATUS(AE_OK);
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error_exit:
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/* Base was set/validated above (10 or 16) */
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if (base == 10) {
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return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
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} else {
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return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
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}
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}
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#ifdef _OBSOLETE_FUNCTIONS
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/* Removed: 01/2016 */
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/*******************************************************************************
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*
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* FUNCTION: strtoul64
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*
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* PARAMETERS: string - Null terminated string
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* terminater - Where a pointer to the terminating byte
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* is returned
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* base - Radix of the string
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*
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* RETURN: Converted value
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*
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* DESCRIPTION: Convert a string into an unsigned value.
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*
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******************************************************************************/
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acpi_status strtoul64(char *string, u32 base, u64 *ret_integer)
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{
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u32 index;
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u32 sign;
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u64 return_value = 0;
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acpi_status status = AE_OK;
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*ret_integer = 0;
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switch (base) {
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case 0:
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case 8:
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case 10:
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case 16:
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break;
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default:
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/*
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* The specified Base parameter is not in the domain of
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* this function:
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*/
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return (AE_BAD_PARAMETER);
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}
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/* Skip over any white space in the buffer: */
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while (isspace((int)*string) || *string == '\t') {
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++string;
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}
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/*
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* The buffer may contain an optional plus or minus sign.
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* If it does, then skip over it but remember what is was:
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*/
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if (*string == '-') {
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sign = ACPI_SIGN_NEGATIVE;
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++string;
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} else if (*string == '+') {
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++string;
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sign = ACPI_SIGN_POSITIVE;
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} else {
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sign = ACPI_SIGN_POSITIVE;
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}
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/*
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* If the input parameter Base is zero, then we need to
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* determine if it is octal, decimal, or hexadecimal:
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*/
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if (base == 0) {
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if (*string == '0') {
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if (tolower((int)*(++string)) == 'x') {
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base = 16;
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++string;
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} else {
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base = 8;
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}
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} else {
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base = 10;
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}
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}
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/*
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* For octal and hexadecimal bases, skip over the leading
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* 0 or 0x, if they are present.
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*/
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if (base == 8 && *string == '0') {
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string++;
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}
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if (base == 16 && *string == '0' && tolower((int)*(++string)) == 'x') {
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string++;
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}
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/* Main loop: convert the string to an unsigned long */
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while (*string) {
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if (isdigit((int)*string)) {
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index = ((u8)*string) - '0';
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} else {
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index = (u8)toupper((int)*string);
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if (isupper((int)index)) {
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index = index - 'A' + 10;
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} else {
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goto error_exit;
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}
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}
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if (index >= base) {
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goto error_exit;
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}
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/* Check to see if value is out of range: */
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if (return_value > ((ACPI_UINT64_MAX - (u64)index) / (u64)base)) {
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goto error_exit;
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} else {
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return_value *= base;
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return_value += index;
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}
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++string;
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}
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/* If a minus sign was present, then "the conversion is negated": */
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if (sign == ACPI_SIGN_NEGATIVE) {
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return_value = (ACPI_UINT32_MAX - return_value) + 1;
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}
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*ret_integer = return_value;
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return (status);
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error_exit:
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switch (base) {
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case 8:
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status = AE_BAD_OCTAL_CONSTANT;
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break;
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case 10:
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status = AE_BAD_DECIMAL_CONSTANT;
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break;
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case 16:
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status = AE_BAD_HEX_CONSTANT;
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break;
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default:
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/* Base validated above */
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break;
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}
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return (status);
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}
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#endif
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