source/components/utilities/utascii.c

/******************************************************************************
 *
 * Module Name: utascii - Utility ascii functions
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2022, Intel Corp.
 * All rights reserved.
 *
 * 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.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * 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
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 */

#include "acpi.h"
#include "accommon.h"


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtValidNameseg
 *
 * PARAMETERS:  Name            - The name or table signature to be examined.
 *                                Four characters, does not have to be a
 *                                NULL terminated string.
 *
 * RETURN:      TRUE if signature is has 4 valid ACPI characters
 *
 * DESCRIPTION: Validate an ACPI table signature.
 *
 ******************************************************************************/

BOOLEAN
AcpiUtValidNameseg (
    char                    *Name)
{
    UINT32                  i;


    /* Validate each character in the signature */

    for (i = 0; i < ACPI_NAMESEG_SIZE; i++)
    {
        if (!AcpiUtValidNameChar (Name[i], i))
        {
            return (FALSE);
        }
    }

    return (TRUE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtValidNameChar
 *
 * PARAMETERS:  Char            - The character to be examined
 *              Position        - Byte position (0-3)
 *
 * RETURN:      TRUE if the character is valid, FALSE otherwise
 *
 * DESCRIPTION: Check for a valid ACPI character. Must be one of:
 *              1) Upper case alpha
 *              2) numeric
 *              3) underscore
 *
 *              We allow a '!' as the last character because of the ASF! table
 *
 ******************************************************************************/

BOOLEAN
AcpiUtValidNameChar (
    char                    Character,
    UINT32                  Position)
{

    if (!((Character >= 'A' && Character <= 'Z') ||
          (Character >= '0' && Character <= '9') ||
          (Character == '_')))
    {
        /* Allow a '!' in the last position */

        if (Character == '!' && Position == 3)
        {
            return (TRUE);
        }

        return (FALSE);
    }

    return (TRUE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtCheckAndRepairAscii
 *
 * PARAMETERS:  Name                - Ascii string
 *              Count               - Number of characters to check
 *
 * RETURN:      None
 *
 * DESCRIPTION: Ensure that the requested number of characters are printable
 *              Ascii characters. Sets non-printable and null chars to <space>.
 *
 ******************************************************************************/

void
AcpiUtCheckAndRepairAscii (
    UINT8                   *Name,
    char                    *RepairedName,
    UINT32                  Count)
{
    UINT32                  i;


    for (i = 0; i < Count; i++)
    {
        RepairedName[i] = (char) Name[i];

        if (!Name[i])
        {
            return;
        }
        if (!isprint (Name[i]))
        {
            RepairedName[i] = ' ';
        }
    }
}