107 lines
2.8 KiB
C
107 lines
2.8 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: utascii - Utility ascii functions
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*
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* Copyright (C) 2000 - 2018, Intel Corp.
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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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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_valid_nameseg
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*
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* PARAMETERS: name - The name or table signature to be examined.
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* Four characters, does not have to be a
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* NULL terminated string.
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*
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* RETURN: TRUE if signature is has 4 valid ACPI characters
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*
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* DESCRIPTION: Validate an ACPI table signature.
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*
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******************************************************************************/
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u8 acpi_ut_valid_nameseg(char *name)
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{
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u32 i;
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/* Validate each character in the signature */
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for (i = 0; i < ACPI_NAME_SIZE; i++) {
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if (!acpi_ut_valid_name_char(name[i], i)) {
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return (FALSE);
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}
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}
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return (TRUE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_valid_name_char
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*
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* PARAMETERS: char - The character to be examined
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* position - Byte position (0-3)
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*
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* RETURN: TRUE if the character is valid, FALSE otherwise
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*
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* DESCRIPTION: Check for a valid ACPI character. Must be one of:
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* 1) Upper case alpha
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* 2) numeric
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* 3) underscore
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*
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* We allow a '!' as the last character because of the ASF! table
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*
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******************************************************************************/
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u8 acpi_ut_valid_name_char(char character, u32 position)
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{
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if (!((character >= 'A' && character <= 'Z') ||
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(character >= '0' && character <= '9') || (character == '_'))) {
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/* Allow a '!' in the last position */
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if (character == '!' && position == 3) {
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return (TRUE);
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}
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return (FALSE);
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}
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return (TRUE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ut_check_and_repair_ascii
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*
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* PARAMETERS: name - Ascii string
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* count - Number of characters to check
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*
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* RETURN: None
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*
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* DESCRIPTION: Ensure that the requested number of characters are printable
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* Ascii characters. Sets non-printable and null chars to <space>.
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*
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******************************************************************************/
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void acpi_ut_check_and_repair_ascii(u8 *name, char *repaired_name, u32 count)
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{
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u32 i;
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for (i = 0; i < count; i++) {
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repaired_name[i] = (char)name[i];
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if (!name[i]) {
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return;
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}
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if (!isprint(name[i])) {
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repaired_name[i] = ' ';
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}
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}
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}
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