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utascii.c revision 1.1 
      1 /******************************************************************************
      2  *
      3  * Module Name: utascii - Utility ascii functions
      4  *
      5  *****************************************************************************/
      6 
      7 /*
      8  * Copyright (C) 2000 - 2016, Intel Corp.
      9  * All rights reserved.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions, and the following disclaimer,
     16  *    without modification.
     17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
     18  *    substantially similar to the "NO WARRANTY" disclaimer below
     19  *    ("Disclaimer") and any redistribution must be conditioned upon
     20  *    including a substantially similar Disclaimer requirement for further
     21  *    binary redistribution.
     22  * 3. Neither the names of the above-listed copyright holders nor the names
     23  *    of any contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * Alternatively, this software may be distributed under the terms of the
     27  * GNU General Public License ("GPL") version 2 as published by the Free
     28  * Software Foundation.
     29  *
     30  * NO WARRANTY
     31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
     34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     41  * POSSIBILITY OF SUCH DAMAGES.
     42  */
     43 
     44 #include "acpi.h"
     45 #include "accommon.h"
     46 
     47 
     48 /*******************************************************************************
     49  *
     50  * FUNCTION:    AcpiUtValidNameseg
     51  *
     52  * PARAMETERS:  Name            - The name or table signature to be examined.
     53  *                                Four characters, does not have to be a
     54  *                                NULL terminated string.
     55  *
     56  * RETURN:      TRUE if signature is has 4 valid ACPI characters
     57  *
     58  * DESCRIPTION: Validate an ACPI table signature.
     59  *
     60  ******************************************************************************/
     61 
     62 BOOLEAN
     63 AcpiUtValidNameseg (
     64     char                    *Name)
     65 {
     66     UINT32                  i;
     67 
     68 
     69     /* Validate each character in the signature */
     70 
     71     for (i = 0; i < ACPI_NAME_SIZE; i++)
     72     {
     73         if (!AcpiUtValidNameChar (Name[i], i))
     74         {
     75             return (FALSE);
     76         }
     77     }
     78 
     79     return (TRUE);
     80 }
     81 
     82 
     83 /*******************************************************************************
     84  *
     85  * FUNCTION:    AcpiUtValidNameChar
     86  *
     87  * PARAMETERS:  Char            - The character to be examined
     88  *              Position        - Byte position (0-3)
     89  *
     90  * RETURN:      TRUE if the character is valid, FALSE otherwise
     91  *
     92  * DESCRIPTION: Check for a valid ACPI character. Must be one of:
     93  *              1) Upper case alpha
     94  *              2) numeric
     95  *              3) underscore
     96  *
     97  *              We allow a '!' as the last character because of the ASF! table
     98  *
     99  ******************************************************************************/
    100 
    101 BOOLEAN
    102 AcpiUtValidNameChar (
    103     char                    Character,
    104     UINT32                  Position)
    105 {
    106 
    107     if (!((Character >= 'A' && Character <= 'Z') ||
    108           (Character >= '0' && Character <= '9') ||
    109           (Character == '_')))
    110     {
    111         /* Allow a '!' in the last position */
    112 
    113         if (Character == '!' && Position == 3)
    114         {
    115             return (TRUE);
    116         }
    117 
    118         return (FALSE);
    119     }
    120 
    121     return (TRUE);
    122 }
    123 
    124 
    125 /*******************************************************************************
    126  *
    127  * FUNCTION:    AcpiUtCheckAndRepairAscii
    128  *
    129  * PARAMETERS:  Name                - Ascii string
    130  *              Count               - Number of characters to check
    131  *
    132  * RETURN:      None
    133  *
    134  * DESCRIPTION: Ensure that the requested number of characters are printable
    135  *              Ascii characters. Sets non-printable and null chars to <space>.
    136  *
    137  ******************************************************************************/
    138 
    139 void
    140 AcpiUtCheckAndRepairAscii (
    141     UINT8                   *Name,
    142     char                    *RepairedName,
    143     UINT32                  Count)
    144 {
    145     UINT32                  i;
    146 
    147 
    148     for (i = 0; i < Count; i++)
    149     {
    150         RepairedName[i] = (char) Name[i];
    151 
    152         if (!Name[i])
    153         {
    154             return;
    155         }
    156         if (!isprint (Name[i]))
    157         {
    158             RepairedName[i] = ' ';
    159         }
    160     }
    161 }
    162