dist/utilities/utstring.c

/*******************************************************************************
 *
 * Module Name: utstring - Common functions for strings and characters
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2016, 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 MERCHANTIBILITY 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"
#include "acnamesp.h"


#define _COMPONENT          ACPI_UTILITIES
        ACPI_MODULE_NAME    ("utstring")


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtPrintString
 *
 * PARAMETERS:  String          - Null terminated ASCII string
 *              MaxLength       - Maximum output length. Used to constrain the
 *                                length of strings during debug output only.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
 *              sequences.
 *
 ******************************************************************************/

void
AcpiUtPrintString (
    char                    *String,
    UINT16                  MaxLength)
{
    UINT32                  i;


    if (!String)
    {
        AcpiOsPrintf ("<\"NULL STRING PTR\">");
        return;
    }

    AcpiOsPrintf ("\"");
    for (i = 0; (i < MaxLength) && String[i]; i++)
    {
        /* Escape sequences */

        switch (String[i])
        {
        case 0x07:

            AcpiOsPrintf ("\\a");       /* BELL */
            break;

        case 0x08:

            AcpiOsPrintf ("\\b");       /* BACKSPACE */
            break;

        case 0x0C:

            AcpiOsPrintf ("\\f");       /* FORMFEED */
            break;

        case 0x0A:

            AcpiOsPrintf ("\\n");       /* LINEFEED */
            break;

        case 0x0D:

            AcpiOsPrintf ("\\r");       /* CARRIAGE RETURN*/
            break;

        case 0x09:

            AcpiOsPrintf ("\\t");       /* HORIZONTAL TAB */
            break;

        case 0x0B:

            AcpiOsPrintf ("\\v");       /* VERTICAL TAB */
            break;

        case '\'':                      /* Single Quote */
        case '\"':                      /* Double Quote */
        case '\\':                      /* Backslash */

            AcpiOsPrintf ("\\%c", (int) String[i]);
            break;

        default:

            /* Check for printable character or hex escape */

            if (isprint ((int) String[i]))
            {
                /* This is a normal character */

                AcpiOsPrintf ("%c", (int) String[i]);
            }
            else
            {
                /* All others will be Hex escapes */

                AcpiOsPrintf ("\\x%2.2X", (INT32) String[i]);
            }
            break;
        }
    }

    AcpiOsPrintf ("\"");

    if (i == MaxLength && String[i])
    {
        AcpiOsPrintf ("...");
    }
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtValidAcpiChar
 *
 * 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
AcpiUtValidAcpiChar (
    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:    AcpiUtValidAcpiName
 *
 * PARAMETERS:  Name            - The name to be examined. Does not have to
 *                                be NULL terminated string.
 *
 * RETURN:      TRUE if the name is valid, FALSE otherwise
 *
 * DESCRIPTION: Check for a valid ACPI name. Each character must be one of:
 *              1) Upper case alpha
 *              2) numeric
 *              3) underscore
 *
 ******************************************************************************/

BOOLEAN
AcpiUtValidAcpiName (
    char                    *Name)
{
    UINT32                  i;


    ACPI_FUNCTION_ENTRY ();


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

    return (TRUE);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiUtRepairName
 *
 * PARAMETERS:  Name            - The ACPI name to be repaired
 *
 * RETURN:      Repaired version of the name
 *
 * DESCRIPTION: Repair an ACPI name: Change invalid characters to '*' and
 *              return the new name. NOTE: the Name parameter must reside in
 *              read/write memory, cannot be a const.
 *
 * An ACPI Name must consist of valid ACPI characters. We will repair the name
 * if necessary because we don't want to abort because of this, but we want
 * all namespace names to be printable. A warning message is appropriate.
 *
 * This issue came up because there are in fact machines that exhibit
 * this problem, and we want to be able to enable ACPI support for them,
 * even though there are a few bad names.
 *
 ******************************************************************************/

void
AcpiUtRepairName (
    char                    *Name)
{
    UINT32                  i;
    BOOLEAN                 FoundBadChar = FALSE;
    UINT32                  OriginalName;


    ACPI_FUNCTION_NAME (UtRepairName);


    /*
     * Special case for the root node. This can happen if we get an
     * error during the execution of module-level code.
     */
    if (ACPI_COMPARE_NAME (Name, "\\___"))
    {
        return;
    }

    ACPI_MOVE_NAME (&OriginalName, Name);

    /* Check each character in the name */

    for (i = 0; i < ACPI_NAME_SIZE; i++)
    {
        if (AcpiUtValidAcpiChar (Name[i], i))
        {
            continue;
        }

        /*
         * Replace a bad character with something printable, yet technically
         * still invalid. This prevents any collisions with existing "good"
         * names in the namespace.
         */
        Name[i] = '*';
        FoundBadChar = TRUE;
    }

    if (FoundBadChar)
    {
        /* Report warning only if in strict mode or debug mode */

        if (!AcpiGbl_EnableInterpreterSlack)
        {
            ACPI_WARNING ((AE_INFO,
                "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
                OriginalName, Name));
        }
        else
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                "Invalid character(s) in name (0x%.8X), repaired: [%4.4s]",
                OriginalName, Name));
        }
    }
}


#if defined ACPI_ASL_COMPILER || defined ACPI_EXEC_APP
/*******************************************************************************
 *
 * FUNCTION:    UtConvertBackslashes
 *
 * PARAMETERS:  Pathname        - File pathname string to be converted
 *
 * RETURN:      Modifies the input Pathname
 *
 * DESCRIPTION: Convert all backslashes (0x5C) to forward slashes (0x2F) within
 *              the entire input file pathname string.
 *
 ******************************************************************************/

void
UtConvertBackslashes (
    char                    *Pathname)
{

    if (!Pathname)
    {
        return;
    }

    while (*Pathname)
    {
        if (*Pathname == '\\')
        {
            *Pathname = '/';
        }

        Pathname++;
    }
}
#endif