429 строки
12 KiB
C
429 строки
12 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/*******************************************************************************
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*
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* Module Name: utstrsuppt - Support functions for string-to-integer conversion
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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("utstrsuppt")
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/* Local prototypes */
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static acpi_status
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acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit);
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static acpi_status
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acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product);
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static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_convert_octal_string
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*
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* PARAMETERS: string - Null terminated input string
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* return_value_ptr - Where the converted value is returned
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*
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* RETURN: Status and 64-bit converted integer
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*
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* DESCRIPTION: Performs a base 8 conversion of the input string to an
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* integer value, either 32 or 64 bits.
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*
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* NOTE: Maximum 64-bit unsigned octal value is 01777777777777777777777
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* Maximum 32-bit unsigned octal value is 037777777777
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*
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******************************************************************************/
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acpi_status acpi_ut_convert_octal_string(char *string, u64 *return_value_ptr)
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{
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u64 accumulated_value = 0;
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acpi_status status = AE_OK;
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/* Convert each ASCII byte in the input string */
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while (*string) {
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/* Character must be ASCII 0-7, otherwise terminate with no error */
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if (!(ACPI_IS_OCTAL_DIGIT(*string))) {
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break;
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}
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/* Convert and insert this octal digit into the accumulator */
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status = acpi_ut_insert_digit(&accumulated_value, 8, *string);
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if (ACPI_FAILURE(status)) {
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status = AE_OCTAL_OVERFLOW;
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break;
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}
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string++;
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}
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/* Always return the value that has been accumulated */
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*return_value_ptr = accumulated_value;
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_convert_decimal_string
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*
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* PARAMETERS: string - Null terminated input string
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* return_value_ptr - Where the converted value is returned
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*
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* RETURN: Status and 64-bit converted integer
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*
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* DESCRIPTION: Performs a base 10 conversion of the input string to an
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* integer value, either 32 or 64 bits.
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*
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* NOTE: Maximum 64-bit unsigned decimal value is 18446744073709551615
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* Maximum 32-bit unsigned decimal value is 4294967295
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*
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******************************************************************************/
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acpi_status acpi_ut_convert_decimal_string(char *string, u64 *return_value_ptr)
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{
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u64 accumulated_value = 0;
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acpi_status status = AE_OK;
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/* Convert each ASCII byte in the input string */
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while (*string) {
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/* Character must be ASCII 0-9, otherwise terminate with no error */
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if (!isdigit(*string)) {
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break;
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}
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/* Convert and insert this decimal digit into the accumulator */
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status = acpi_ut_insert_digit(&accumulated_value, 10, *string);
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if (ACPI_FAILURE(status)) {
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status = AE_DECIMAL_OVERFLOW;
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break;
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}
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string++;
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}
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/* Always return the value that has been accumulated */
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*return_value_ptr = accumulated_value;
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_convert_hex_string
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*
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* PARAMETERS: string - Null terminated input string
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* return_value_ptr - Where the converted value is returned
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*
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* RETURN: Status and 64-bit converted integer
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*
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* DESCRIPTION: Performs a base 16 conversion of the input string to an
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* integer value, either 32 or 64 bits.
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*
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* NOTE: Maximum 64-bit unsigned hex value is 0xFFFFFFFFFFFFFFFF
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* Maximum 32-bit unsigned hex value is 0xFFFFFFFF
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*
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******************************************************************************/
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acpi_status acpi_ut_convert_hex_string(char *string, u64 *return_value_ptr)
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{
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u64 accumulated_value = 0;
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acpi_status status = AE_OK;
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/* Convert each ASCII byte in the input string */
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while (*string) {
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/* Must be ASCII A-F, a-f, or 0-9, otherwise terminate with no error */
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if (!isxdigit(*string)) {
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break;
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}
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/* Convert and insert this hex digit into the accumulator */
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status = acpi_ut_insert_digit(&accumulated_value, 16, *string);
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if (ACPI_FAILURE(status)) {
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status = AE_HEX_OVERFLOW;
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break;
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}
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string++;
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}
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/* Always return the value that has been accumulated */
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*return_value_ptr = accumulated_value;
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_remove_leading_zeros
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*
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* PARAMETERS: string - Pointer to input ASCII string
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*
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* RETURN: Next character after any leading zeros. This character may be
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* used by the caller to detect end-of-string.
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*
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* DESCRIPTION: Remove any leading zeros in the input string. Return the
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* next character after the final ASCII zero to enable the caller
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* to check for the end of the string (NULL terminator).
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*
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******************************************************************************/
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char acpi_ut_remove_leading_zeros(char **string)
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{
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while (**string == ACPI_ASCII_ZERO) {
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*string += 1;
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}
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return (**string);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_remove_whitespace
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*
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* PARAMETERS: string - Pointer to input ASCII string
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*
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* RETURN: Next character after any whitespace. This character may be
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* used by the caller to detect end-of-string.
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*
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* DESCRIPTION: Remove any leading whitespace in the input string. Return the
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* next character after the final ASCII zero to enable the caller
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* to check for the end of the string (NULL terminator).
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*
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******************************************************************************/
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char acpi_ut_remove_whitespace(char **string)
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{
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while (isspace((u8)**string)) {
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*string += 1;
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}
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return (**string);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_detect_hex_prefix
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*
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* PARAMETERS: string - Pointer to input ASCII string
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*
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* RETURN: TRUE if a "0x" prefix was found at the start of the string
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*
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* DESCRIPTION: Detect and remove a hex "0x" prefix
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*
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******************************************************************************/
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u8 acpi_ut_detect_hex_prefix(char **string)
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{
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char *initial_position = *string;
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acpi_ut_remove_hex_prefix(string);
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if (*string != initial_position) {
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return (TRUE); /* String is past leading 0x */
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}
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return (FALSE); /* Not a hex string */
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_remove_hex_prefix
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*
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* PARAMETERS: string - Pointer to input ASCII string
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*
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* RETURN: none
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*
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* DESCRIPTION: Remove a hex "0x" prefix
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*
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******************************************************************************/
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void acpi_ut_remove_hex_prefix(char **string)
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{
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if ((**string == ACPI_ASCII_ZERO) &&
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(tolower((int)*(*string + 1)) == 'x')) {
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*string += 2; /* Go past the leading 0x */
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_detect_octal_prefix
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*
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* PARAMETERS: string - Pointer to input ASCII string
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*
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* RETURN: True if an octal "0" prefix was found at the start of the
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* string
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*
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* DESCRIPTION: Detect and remove an octal prefix (zero)
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*
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******************************************************************************/
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u8 acpi_ut_detect_octal_prefix(char **string)
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{
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if (**string == ACPI_ASCII_ZERO) {
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*string += 1; /* Go past the leading 0 */
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return (TRUE);
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}
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return (FALSE); /* Not an octal string */
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_insert_digit
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*
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* PARAMETERS: accumulated_value - Current value of the integer value
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* accumulator. The new value is
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* returned here.
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* base - Radix, either 8/10/16
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* ascii_digit - ASCII single digit to be inserted
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*
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* RETURN: Status and result of the convert/insert operation. The only
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* possible returned exception code is numeric overflow of
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* either the multiply or add conversion operations.
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*
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* DESCRIPTION: Generic conversion and insertion function for all bases:
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*
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* 1) Multiply the current accumulated/converted value by the
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* base in order to make room for the new character.
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*
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* 2) Convert the new character to binary and add it to the
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* current accumulated value.
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*
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* Note: The only possible exception indicates an integer
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* overflow (AE_NUMERIC_OVERFLOW)
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*
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******************************************************************************/
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static acpi_status
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acpi_ut_insert_digit(u64 *accumulated_value, u32 base, int ascii_digit)
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{
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acpi_status status;
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u64 product;
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/* Make room in the accumulated value for the incoming digit */
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status = acpi_ut_strtoul_multiply64(*accumulated_value, base, &product);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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/* Add in the new digit, and store the sum to the accumulated value */
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status =
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acpi_ut_strtoul_add64(product,
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acpi_ut_ascii_char_to_hex(ascii_digit),
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accumulated_value);
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return (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_strtoul_multiply64
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*
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* PARAMETERS: multiplicand - Current accumulated converted integer
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* base - Base/Radix
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* out_product - Where the product is returned
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*
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* RETURN: Status and 64-bit product
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*
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* DESCRIPTION: Multiply two 64-bit values, with checking for 64-bit overflow as
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* well as 32-bit overflow if necessary (if the current global
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* integer width is 32).
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*
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******************************************************************************/
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static acpi_status
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acpi_ut_strtoul_multiply64(u64 multiplicand, u32 base, u64 *out_product)
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{
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u64 product;
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u64 quotient;
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/* Exit if either operand is zero */
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*out_product = 0;
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if (!multiplicand || !base) {
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return (AE_OK);
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}
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/*
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* Check for 64-bit overflow before the actual multiplication.
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*
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* Notes: 64-bit division is often not supported on 32-bit platforms
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* (it requires a library function), Therefore ACPICA has a local
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* 64-bit divide function. Also, Multiplier is currently only used
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* as the radix (8/10/16), to the 64/32 divide will always work.
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*/
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acpi_ut_short_divide(ACPI_UINT64_MAX, base, "ient, NULL);
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if (multiplicand > quotient) {
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return (AE_NUMERIC_OVERFLOW);
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}
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product = multiplicand * base;
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/* Check for 32-bit overflow if necessary */
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if ((acpi_gbl_integer_bit_width == 32) && (product > ACPI_UINT32_MAX)) {
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return (AE_NUMERIC_OVERFLOW);
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}
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*out_product = product;
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_strtoul_add64
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*
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* PARAMETERS: addend1 - Current accumulated converted integer
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* digit - New hex value/char
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* out_sum - Where sum is returned (Accumulator)
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*
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* RETURN: Status and 64-bit sum
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*
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* DESCRIPTION: Add two 64-bit values, with checking for 64-bit overflow as
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* well as 32-bit overflow if necessary (if the current global
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* integer width is 32).
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*
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******************************************************************************/
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static acpi_status acpi_ut_strtoul_add64(u64 addend1, u32 digit, u64 *out_sum)
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{
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u64 sum;
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/* Check for 64-bit overflow before the actual addition */
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if ((addend1 > 0) && (digit > (ACPI_UINT64_MAX - addend1))) {
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return (AE_NUMERIC_OVERFLOW);
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}
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sum = addend1 + digit;
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/* Check for 32-bit overflow if necessary */
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if ((acpi_gbl_integer_bit_width == 32) && (sum > ACPI_UINT32_MAX)) {
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return (AE_NUMERIC_OVERFLOW);
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}
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*out_sum = sum;
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return (AE_OK);
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}
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