FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/acpica/compiler/dtfield.c

     /******************************************************************************
      *
      * Module Name: dtfield.c - Code generation for individual source fields
      *
      *****************************************************************************/
     
     /******************************************************************************
      *
      * 1. Copyright Notice
     *
     * Some or all of this work - Copyright (c) 1999 - 2022, Intel Corp.
     * All rights reserved.
     *
     * 2. License
     *
     * 2.1. This is your license from Intel Corp. under its intellectual property
     * rights. You may have additional license terms from the party that provided
     * you this software, covering your right to use that party's intellectual
     * property rights.
     *
     * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     * copy of the source code appearing in this file ("Covered Code") an
     * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     * base code distributed originally by Intel ("Original Intel Code") to copy,
     * make derivatives, distribute, use and display any portion of the Covered
     * Code in any form, with the right to sublicense such rights; and
     *
     * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     * license (with the right to sublicense), under only those claims of Intel
     * patents that are infringed by the Original Intel Code, to make, use, sell,
     * offer to sell, and import the Covered Code and derivative works thereof
     * solely to the minimum extent necessary to exercise the above copyright
     * license, and in no event shall the patent license extend to any additions
     * to or modifications of the Original Intel Code. No other license or right
     * is granted directly or by implication, estoppel or otherwise;
     *
     * The above copyright and patent license is granted only if the following
     * conditions are met:
     *
     * 3. Conditions
     *
     * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification with rights to further distribute source must include
     * the above Copyright Notice, the above License, this list of Conditions,
     * and the following Disclaimer and Export Compliance provision. In addition,
     * Licensee must cause all Covered Code to which Licensee contributes to
     * contain a file documenting the changes Licensee made to create that Covered
     * Code and the date of any change. Licensee must include in that file the
     * documentation of any changes made by any predecessor Licensee. Licensee
     * must include a prominent statement that the modification is derived,
     * directly or indirectly, from Original Intel Code.
     *
     * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     * Redistribution of source code of any substantial portion of the Covered
     * Code or modification without rights to further distribute source must
     * include the following Disclaimer and Export Compliance provision in the
     * documentation and/or other materials provided with distribution. In
     * addition, Licensee may not authorize further sublicense of source of any
     * portion of the Covered Code, and must include terms to the effect that the
     * license from Licensee to its licensee is limited to the intellectual
     * property embodied in the software Licensee provides to its licensee, and
     * not to intellectual property embodied in modifications its licensee may
     * make.
     *
     * 3.3. Redistribution of Executable. Redistribution in executable form of any
     * substantial portion of the Covered Code or modification must reproduce the
     * above Copyright Notice, and the following Disclaimer and Export Compliance
     * provision in the documentation and/or other materials provided with the
     * distribution.
     *
     * 3.4. Intel retains all right, title, and interest in and to the Original
     * Intel Code.
     *
     * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     * Intel shall be used in advertising or otherwise to promote the sale, use or
     * other dealings in products derived from or relating to the Covered Code
     * without prior written authorization from Intel.
     *
     * 4. Disclaimer and Export Compliance
     *
     * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
     * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
     * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
     * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     * PARTICULAR PURPOSE.
     *
     * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
     * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     * LIMITED REMEDY.
     *
     * 4.3. Licensee shall not export, either directly or indirectly, any of this
    * software or system incorporating such software without first obtaining any
    * required license or other approval from the U. S. Department of Commerce or
    * any other agency or department of the United States Government. In the
    * event Licensee exports any such software from the United States or
    * re-exports any such software from a foreign destination, Licensee shall
    * ensure that the distribution and export/re-export of the software is in
    * compliance with all laws, regulations, orders, or other restrictions of the
    * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    * any of its subsidiaries will export/re-export any technical data, process,
    * software, or service, directly or indirectly, to any country for which the
    * United States government or any agency thereof requires an export license,
    * other governmental approval, or letter of assurance, without first obtaining
    * such license, approval or letter.
    *
    *****************************************************************************
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * following license:
    *
    * 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.
    *
    * 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
    * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    * 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 DAMAGE.
    *
    * Alternatively, you may choose to be licensed under the terms of the
    * GNU General Public License ("GPL") version 2 as published by the Free
    * Software Foundation.
    *
    *****************************************************************************/
   
   #include <contrib/dev/acpica/compiler/aslcompiler.h>
   
   #define _COMPONENT          DT_COMPILER
           ACPI_MODULE_NAME    ("dtfield")
   
   
   /* Local prototypes */
   
   static void
   DtCompileString (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength);
   
   static void
   DtCompileUnicode (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength);
   
   static ACPI_STATUS
   DtCompileUuid (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength);
   
   static char *
   DtNormalizeBuffer (
       char                    *Buffer,
       UINT32                  *Count);
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileOneField
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              Field               - Field to be compiled
    *              ByteLength          - Byte length of the field
    *              Type                - Field type
    *
    * RETURN:      None
    *
    * DESCRIPTION: Compile a field value to binary
    *
    *****************************************************************************/
   
   void
   DtCompileOneField (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength,
       UINT8                   Type,
       UINT8                   Flags)
   {
       ACPI_STATUS             Status;
   
   
       switch (Type)
       {
       case DT_FIELD_TYPE_INTEGER:
   
           DtCompileInteger (Buffer, Field, ByteLength, Flags);
           break;
   
       case DT_FIELD_TYPE_STRING:
   
           DtCompileString (Buffer, Field, ByteLength);
           break;
   
       case DT_FIELD_TYPE_UUID:
   
           Status = DtCompileUuid (Buffer, Field, ByteLength);
           if (ACPI_SUCCESS (Status))
           {
               break;
           }
   
           ACPI_FALLTHROUGH;
   
       case DT_FIELD_TYPE_BUFFER:
   
           DtCompileBuffer (Buffer, Field->Value, Field, ByteLength);
           break;
   
       case DT_FIELD_TYPE_UNICODE:
   
           DtCompileUnicode (Buffer, Field, ByteLength);
           break;
   
       case DT_FIELD_TYPE_DEVICE_PATH:
   
           break;
   
       default:
   
           DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid field type");
           break;
       }
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileString
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              Field               - String to be copied to buffer
    *              ByteLength          - Maximum length of string
    *
    * RETURN:      None
    *
    * DESCRIPTION: Copy string to the buffer
    *
    *****************************************************************************/
   
   static void
   DtCompileString (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength)
   {
       UINT32                  Length;
   
   
       Length = strlen (Field->Value);
   
       /* Check if the string is too long for the field */
   
       if (Length > ByteLength)
       {
           sprintf (AslGbl_MsgBuffer,
               "Maximum %u characters, found %u characters [%s]",
               ByteLength, Length, Field->Value);
           DtError (ASL_ERROR, ASL_MSG_STRING_LENGTH, Field, AslGbl_MsgBuffer);
           Length = ByteLength;
       }
   
       memcpy (Buffer, Field->Value, Length);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileUnicode
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              Field               - String to be copied to buffer
    *              ByteLength          - Maximum length of string
    *
    * RETURN:      None
    *
    * DESCRIPTION: Convert ASCII string to Unicode string
    *
    * Note:  The Unicode string is 16 bits per character, no leading signature,
    *        with a 16-bit terminating NULL.
    *
    *****************************************************************************/
   
   static void
   DtCompileUnicode (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength)
   {
       UINT32                  Count;
       UINT32                  i;
       char                    *AsciiString;
       UINT16                  *UnicodeString;
   
   
       AsciiString = Field->Value;
       UnicodeString = (UINT16 *) Buffer;
       Count = strlen (AsciiString) + 1;
   
       /* Convert to Unicode string (including null terminator) */
   
       for (i = 0; i < Count; i++)
       {
           UnicodeString[i] = (UINT16) AsciiString[i];
       }
   }
   
   
   /*******************************************************************************
    *
    * FUNCTION:    DtCompileUuid
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              Field               - String to be copied to buffer
    *              ByteLength          - Maximum length of string
    *
    * RETURN:      None
    *
    * DESCRIPTION: Convert UUID string to 16-byte buffer
    *
    ******************************************************************************/
   
   static ACPI_STATUS
   DtCompileUuid (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength)
   {
       char                    *InString;
       ACPI_STATUS             Status;
   
   
       InString = Field->Value;
   
       Status = AuValidateUuid (InString);
       if (ACPI_FAILURE (Status))
       {
           sprintf (AslGbl_MsgBuffer, "%s", Field->Value);
           DtNameError (ASL_ERROR, ASL_MSG_INVALID_UUID, Field, AslGbl_MsgBuffer);
       }
       else
       {
           AcpiUtConvertStringToUuid (InString, Buffer);
       }
   
       return (Status);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileInteger
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              Field               - Field obj with Integer to be compiled
    *              ByteLength          - Byte length of the integer
    *              Flags               - Additional compile info
    *
    * RETURN:      None
    *
    * DESCRIPTION: Compile an integer. Supports integer expressions with C-style
    *              operators.
    *
    *****************************************************************************/
   
   void
   DtCompileInteger (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       UINT32                  ByteLength,
       UINT8                   Flags)
   {
       UINT64                  Value;
       UINT64                  MaxValue;
       ACPI_STATUS             Status;
   
   
       /* Output buffer byte length must be in range 1-8 */
   
       if ((ByteLength > 8) || (ByteLength == 0))
       {
           DtFatal (ASL_MSG_COMPILER_INTERNAL, Field,
               "Invalid internal Byte length");
           return;
       }
   
       /* Resolve integer expression to a single integer value */
   
       Status = DtResolveIntegerExpression (Field, &Value);
       if (ACPI_FAILURE (Status))
       {
           return;
       }
   
       /*
        * Ensure that reserved fields are set properly. Note: uses
        * the DT_NON_ZERO flag to indicate that the reserved value
        * must be exactly one. Otherwise, the value must be zero.
        * This is sufficient for now.
        */
   
       /* TBD: Should use a flag rather than compare "Reserved" */
   
       if (!strcmp (Field->Name, "Reserved"))
       {
           if (Flags & DT_NON_ZERO)
           {
               if (Value != 1)
               {
                   DtError (ASL_ERROR, ASL_MSG_RESERVED_FIELD, Field,
                       "Must be one, setting to one");
                   Value = 1;
               }
           }
           else if (Value != 0)
           {
               DtError (ASL_ERROR, ASL_MSG_RESERVED_FIELD, Field,
                   "Must be zero, setting to zero");
               Value = 0;
           }
       }
   
       /* Check if the value must be non-zero */
   
       else if ((Flags & DT_NON_ZERO) && (Value == 0))
       {
           DtError (ASL_ERROR, ASL_MSG_ZERO_VALUE, Field, NULL);
       }
   
       /*
        * Generate the maximum value for the data type (ByteLength)
        * Note: construct chosen for maximum portability
        */
       MaxValue = ((UINT64) (-1)) >> (64 - (ByteLength * 8));
   
       /* Validate that the input value is within range of the target */
   
       if (Value > MaxValue)
       {
           sprintf (AslGbl_MsgBuffer, "%8.8X%8.8X - max %u bytes",
               ACPI_FORMAT_UINT64 (Value), ByteLength);
           DtError (ASL_ERROR, ASL_MSG_INTEGER_SIZE, Field, AslGbl_MsgBuffer);
       }
   
       memcpy (Buffer, &Value, ByteLength);
       return;
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtNormalizeBuffer
    *
    * PARAMETERS:  Buffer              - Input buffer
    *              Count               - Output the count of hex numbers in
    *                                    the Buffer
    *
    * RETURN:      The normalized buffer, must be freed by caller
    *
    * DESCRIPTION: [1A,2B,3C,4D] or 1A, 2B, 3C, 4D will be normalized
    *              to 1A 2B 3C 4D
    *
    *****************************************************************************/
   
   static char *
   DtNormalizeBuffer (
       char                    *Buffer,
       UINT32                  *Count)
   {
       char                    *NewBuffer;
       char                    *TmpBuffer;
       UINT32                  BufferCount = 0;
       BOOLEAN                 Separator = TRUE;
       char                    c;
   
   
       NewBuffer = UtLocalCalloc (strlen (Buffer) + 1);
       TmpBuffer = NewBuffer;
   
       while ((c = *Buffer++))
       {
           switch (c)
           {
           /* Valid separators */
   
           case '[':
           case ']':
           case ' ':
           case ',':
   
               Separator = TRUE;
               break;
   
           default:
   
               if (Separator)
               {
                   /* Insert blank as the standard separator */
   
                   if (NewBuffer[0])
                   {
                       *TmpBuffer++ = ' ';
                       BufferCount++;
                   }
   
                   Separator = FALSE;
               }
   
               *TmpBuffer++ = c;
               break;
           }
       }
   
       *Count = BufferCount + 1;
       return (NewBuffer);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileBuffer
    *
    * PARAMETERS:  Buffer              - Output buffer
    *              StringValue         - Integer list to be compiled
    *              Field               - Current field object
    *              ByteLength          - Byte length of the integer list
    *
    * RETURN:      Count of remaining data in the input list
    *
    * DESCRIPTION: Compile and pack an integer list, for example
    *              "AA 1F 20 3B" ==> Buffer[] = {0xAA,0x1F,0x20,0x3B}
    *
    *****************************************************************************/
   
   UINT32
   DtCompileBuffer (
       UINT8                   *Buffer,
       char                    *StringValue,
       DT_FIELD                *Field,
       UINT32                  ByteLength)
   {
       char                    *Substring;
       ACPI_STATUS             Status;
       UINT32                  Count;
       UINT32                  i;
   
   
       /* Allow several different types of value separators */
   
       StringValue = DtNormalizeBuffer (StringValue, &Count);
       Substring = StringValue;
       if (Count != ByteLength)
       {
           sprintf(AslGbl_MsgBuffer,
               "Found %u values, must match expected count: %u",
               Count, ByteLength);
           DtError (ASL_ERROR, ASL_MSG_BUFFER_LIST, Field, AslGbl_MsgBuffer);
           goto Exit;
       }
   
       /* Each element of StringValue is now three chars (2 hex + 1 space) */
   
       for (i = 0; i < Count; i++, Substring += 3)
       {
           /* Check for byte value too long */
   
           if (*(&Substring[2]) &&
              (*(&Substring[2]) != ' '))
           {
               DtError (ASL_ERROR, ASL_MSG_BUFFER_ELEMENT, Field, Substring);
               goto Exit;
           }
   
           /* Convert two ASCII characters to one hex byte */
   
           Status = AcpiUtAsciiToHexByte (Substring, &Buffer[i]);
           if (ACPI_FAILURE (Status))
           {
               DtError (ASL_ERROR, ASL_MSG_BUFFER_ELEMENT, Field, Substring);
               goto Exit;
           }
       }
   
   Exit:
       ACPI_FREE (StringValue);
       return (ByteLength - Count);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCompileFlag
    *
    * PARAMETERS:  Buffer                      - Output buffer
    *              Field                       - Field to be compiled
    *              Info                        - Flag info
    *
    * RETURN:      None
    *
    * DESCRIPTION: Compile a flag field. Handles flags up to 64 bits.
    *
    *****************************************************************************/
   
   void
   DtCompileFlag (
       UINT8                   *Buffer,
       DT_FIELD                *Field,
       ACPI_DMTABLE_INFO       *Info)
   {
       UINT64                  Value = 0;
       UINT32                  BitLength = 1;
       UINT8                   BitPosition = 0;
   
   
       Value = AcpiUtImplicitStrtoul64 (Field->Value);
   
       switch (Info->Opcode)
       {
       case ACPI_DMT_FLAG0:
       case ACPI_DMT_FLAG1:
       case ACPI_DMT_FLAG2:
       case ACPI_DMT_FLAG3:
       case ACPI_DMT_FLAG4:
       case ACPI_DMT_FLAG5:
       case ACPI_DMT_FLAG6:
       case ACPI_DMT_FLAG7:
   
           BitPosition = Info->Opcode;
           BitLength = 1;
           break;
   
       case ACPI_DMT_FLAGS0:
   
           BitPosition = 0;
           BitLength = 2;
           break;
   
   
       case ACPI_DMT_FLAGS1:
   
           BitPosition = 1;
           BitLength = 2;
           break;
   
   
       case ACPI_DMT_FLAGS2:
   
           BitPosition = 2;
           BitLength = 2;
           break;
   
       case ACPI_DMT_FLAGS8_2:
   
           BitPosition = 2;
           BitLength = 8;
           break;
   
       case ACPI_DMT_FLAGS4:
   
           BitPosition = 4;
           BitLength = 2;
           break;
   
       case ACPI_DMT_FLAGS4_0:
   
           BitPosition = 0;
           BitLength = 4;
           break;
   
       case ACPI_DMT_FLAGS4_4:
   
           BitPosition = 4;
           BitLength = 4;
           break;
   
       case ACPI_DMT_FLAGS4_8:
   
           BitPosition = 8;
           BitLength = 4;
           break;
   
       case ACPI_DMT_FLAGS4_12:
   
           BitPosition = 12;
           BitLength = 4;
           break;
   
       case ACPI_DMT_FLAGS16_16:
   
           BitPosition = 16;
           BitLength = 16;
           break;
   
       default:
   
           DtFatal (ASL_MSG_COMPILER_INTERNAL, Field, "Invalid flag opcode");
           break;
       }
   
       /* Check range of the input flag value */
   
       if (Value >= ((UINT64) 1 << BitLength))
       {
           sprintf (AslGbl_MsgBuffer, "Maximum %u bit", BitLength);
           DtError (ASL_ERROR, ASL_MSG_FLAG_VALUE, Field, AslGbl_MsgBuffer);
           Value = 0;
       }
   
       *Buffer |= (UINT8) (Value << BitPosition);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCreateField
    *
    * PARAMETERS: Name
    *             Value
    *             Line
    *             Offset
    *             Column
    *             NameColumn
    *
    * RETURN:     None
    *
    * DESCRIPTION: Create a field
    *
    *****************************************************************************/
   
   void
   DtCreateField (
       DT_TABLE_UNIT           *FieldKey,
       DT_TABLE_UNIT           *FieldValue,
       UINT32                  Offset)
   {
       DT_FIELD                *Field = UtFieldCacheCalloc ();
   
   
       Field->StringLength = 0;
       if (FieldKey->Value)
       {
           Field->Name =
               strcpy (UtLocalCacheCalloc (strlen (FieldKey->Value) + 1), FieldKey->Value);
       }
   
       if (FieldValue->Value)
       {
           Field->StringLength = strlen (FieldValue->Value);
           Field->Value =
               strcpy (UtLocalCacheCalloc (Field->StringLength + 1), FieldValue->Value);
       }
   
       Field->Line = FieldValue->Line;
       Field->ByteOffset = Offset;
       Field->NameColumn = FieldKey->Column;
       Field->Column = FieldValue->Column;
       DtLinkField (Field);
   
       DtDumpFieldList (AslGbl_FieldList);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtCreateTableUnit
    *
    * PARAMETERS: Data
    *             Line
    *             Column
    *
    * RETURN:     a table unit
    *
    * DESCRIPTION: Create a table unit
    *
    *****************************************************************************/
   
   DT_TABLE_UNIT *
   DtCreateTableUnit (
       char                    *Data,
       UINT32                  Line,
       UINT32                  Column)
   {
       DT_TABLE_UNIT           *Unit = (DT_TABLE_UNIT *) UtFieldCacheCalloc ();
   
   
       Unit->Value = Data;
       Unit->Line = Line;
       Unit->Column = Column;
       return (Unit);
   }
   
   
   /******************************************************************************
    *
    * FUNCTION:    DtLinkField
    *
    * PARAMETERS:  Field               - New field object to link
    *
    * RETURN:      None
    *
    * DESCRIPTION: Link one field name and value to the list
    *
    *****************************************************************************/
   
   void
   DtLinkField (
       DT_FIELD                *Field)
   {
       DT_FIELD                *Prev;
       DT_FIELD                *Next;
   
   
       Prev = Next = AslGbl_FieldList;
   
       while (Next)
       {
           Prev = Next;
           Next = Next->Next;
       }
   
       if (Prev)
       {
           Prev->Next = Field;
       }
       else
       {
           AslGbl_FieldList = Field;
       }
   }

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