/******************************************************************************
 *
 * Module Name: asremove - Source conversion - removal functions
 *
 *****************************************************************************/

/******************************************************************************
 *
 * 1. Copyright Notice
 *
 * Some or all of this work - Copyright (c) 1999 - 2023, 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 "acpisrc.h"

/* Local prototypes */

void
AsRemoveStatement (
    char                    *Buffer,
    char                    *Keyword,
    UINT32                  Type);


/******************************************************************************
 *
 * FUNCTION:    AsRemoveStatement
 *
 * DESCRIPTION: Remove all statements that contain the given keyword.
 *              Limitations:  Removes text from the start of the line that
 *              contains the keyword to the next semicolon. Currently
 *              doesn't ignore comments.
 *
 ******************************************************************************/

void
AsRemoveStatement (
    char                    *Buffer,
    char                    *Keyword,
    UINT32                  Type)
{
    char                    *SubString;
    char                    *SubBuffer;
    int                     KeywordLength;


    KeywordLength = strlen (Keyword);
    SubBuffer = Buffer;
    SubString = Buffer;

    while (SubString)
    {
        SubString = strstr (SubBuffer, Keyword);

        if (SubString)
        {
            SubBuffer = SubString;

            if ((Type == REPLACE_WHOLE_WORD) &&
                (!AsMatchExactWord (SubString, KeywordLength)))
            {
                SubBuffer++;
                continue;
            }

            /* Find start of this line */

            while (*SubString != '\n')
            {
                SubString--;
            }
            SubString++;

            /* Find end of this statement */

            SubBuffer = AsSkipPastChar (SubBuffer, ';');
            if (!SubBuffer)
            {
                return;
            }

            /* Find end of this line */

            SubBuffer = AsSkipPastChar (SubBuffer, '\n');
            if (!SubBuffer)
            {
                return;
            }

            /* If next line is blank, remove it too */

            if (*SubBuffer == '\n')
            {
                SubBuffer++;
            }

            /* Remove the lines */

            SubBuffer = AsRemoveData (SubString, SubBuffer);
        }
    }
}


/******************************************************************************
 *
 * FUNCTION:    AsRemoveConditionalCompile
 *
 * DESCRIPTION: Remove a "#ifdef" statement, and all text that it encompasses.
 *              Limitations: cannot handle nested ifdefs.
 *
 ******************************************************************************/

void
AsRemoveConditionalCompile (
    char                    *Buffer,
    char                    *Keyword)
{
    char                    *SubString;
    char                    *SubBuffer;
    char                    *IfPtr;
    char                    *EndifPtr;
    char                    *ElsePtr;
    char                    *Comment;
    int                     KeywordLength;


    KeywordLength = strlen (Keyword);
    SubString = Buffer;

    while (SubString)
    {
        SubBuffer = strstr (SubString, Keyword);
        if (!SubBuffer)
        {
            return;
        }

        /*
         * Check for translation escape string -- means to ignore
         * blocks of code while replacing
         */
        if (Gbl_IgnoreTranslationEscapes)
        {
            Comment = NULL;
        }
        else
        {
            Comment = strstr (SubString, AS_START_IGNORE);
        }

        if ((Comment) &&
            (Comment < SubBuffer))
        {
            SubString = strstr (Comment, AS_STOP_IGNORE);
            if (!SubString)
            {
                return;
            }

            SubString += 3;
            continue;
        }

        /* Check for ordinary comment */

        Comment = strstr (SubString, "/*");

        if ((Comment) &&
            (Comment < SubBuffer))
        {
            SubString = strstr (Comment, "*/");
            if (!SubString)
            {
                return;
            }

            SubString += 2;
            continue;
        }

        SubString = SubBuffer;
        if (!AsMatchExactWord (SubString, KeywordLength))
        {
            SubString++;
            continue;
        }

        /* Find start of this line */

        while (*SubString != '\n' && (SubString > Buffer))
        {
            SubString--;
        }

        SubString++;

        /* Find the "#ifxxxx" */

        IfPtr = strstr (SubString, "#if");
        if (!IfPtr)
        {
            return;
        }

        if (IfPtr > SubBuffer)
        {
            /* Not the right #if */

            SubString = SubBuffer + strlen (Keyword);
            continue;
        }

        /* Find closing #endif or #else */

        EndifPtr = strstr (SubBuffer, "#endif");
        if (!EndifPtr)
        {
            /* There has to be an #endif */

            return;
        }

        ElsePtr = strstr (SubBuffer, "#else");
        if ((ElsePtr) &&
            (EndifPtr > ElsePtr))
        {
            /* This #ifdef contains an #else clause */
            /* Find end of this line */

            SubBuffer = AsSkipPastChar (ElsePtr, '\n');
            if (!SubBuffer)
            {
                return;
            }

            /* Remove the #ifdef .... #else code */

            AsRemoveData (SubString, SubBuffer);

            /* Next, we will remove the #endif statement */

            EndifPtr = strstr (SubString, "#endif");
            if (!EndifPtr)
            {
                /* There has to be an #endif */

                return;
            }

            SubString = EndifPtr;
        }

        /* Remove the ... #endif part */
        /* Find end of this line */

        SubBuffer = AsSkipPastChar (EndifPtr, '\n');
        if (!SubBuffer)
        {
            return;
        }

        /* Remove the lines */

        (void) AsRemoveData (SubString, SubBuffer);
    }
}


#ifdef _OBSOLETE_FUNCTIONS
/******************************************************************************
 *
 * FUNCTION:    AsRemoveMacro
 *
 * DESCRIPTION: Remove every line that contains the keyword. Does not
 *              skip comments.
 *
 ******************************************************************************/

NOTE: This function is no longer used and is commented out for now.

Also, it appears to have one or more bugs in it. It can incorrectly remove
lines of code, producing some garbage.

void
AsRemoveMacro (
    char                    *Buffer,
    char                    *Keyword)
{
    char                    *SubString;
    char                    *SubBuffer;
    int                     NestLevel;


    SubBuffer = Buffer;
    SubString = Buffer;

    while (SubString)
    {
        SubString = strstr (SubBuffer, Keyword);

        if (SubString)
        {
            SubBuffer = SubString;

            /* Find start of the macro parameters */

            while (*SubString != '(')
            {
                SubString++;
            }
            SubString++;

            /* Remove the macro name and opening paren */

            SubString = AsRemoveData (SubBuffer, SubString);

            NestLevel = 1;
            while (*SubString)
            {
                if (*SubString == '(')
                {
                    NestLevel++;
                }
                else if (*SubString == ')')
                {
                    NestLevel--;
                }

                SubString++;

                if (NestLevel == 0)
                {
                    break;
                }
            }

            /* Remove the closing paren */

            SubBuffer = AsRemoveData (SubString-1, SubString);
        }
    }
}
#endif

/******************************************************************************
 *
 * FUNCTION:    AsRemoveLine
 *
 * DESCRIPTION: Remove every line that contains the keyword. Does not
 *              skip comments.
 *
 ******************************************************************************/

void
AsRemoveLine (
    char                    *Buffer,
    char                    *Keyword)
{
    char                    *SubString;
    char                    *SubBuffer;


    SubBuffer = Buffer;
    SubString = Buffer;

    while (SubString)
    {
        SubString = strstr (SubBuffer, Keyword);

        if (SubString)
        {
            SubBuffer = SubString;

            /* Find start of this line */

            while (*SubString != '\n')
            {
                SubString--;
            }
            SubString++;

            /* Find end of this line */

            SubBuffer = AsSkipPastChar (SubBuffer, '\n');
            if (!SubBuffer)
            {
                return;
            }

            /* Remove the line */

            SubBuffer = AsRemoveData (SubString, SubBuffer);
        }
    }
}


/******************************************************************************
 *
 * FUNCTION:    AsReduceTypedefs
 *
 * DESCRIPTION: Eliminate certain typedefs
 *
 ******************************************************************************/

void
AsReduceTypedefs (
    char                    *Buffer,
    char                    *Keyword)
{
    char                    *SubString;
    char                    *SubBuffer;
    char                    *SubSubString;
    int                     NestLevel;


    SubBuffer = Buffer;
    SubString = Buffer;

    while (SubString)
    {
        SubString = strstr (SubBuffer, Keyword);

        if (SubString)
        {
            SubSubString = SubString + strlen (Keyword);

            /* skip spaces */

            while (strchr(" \t\r\n", *SubSubString))
            {
                SubSubString++;
            }

            /* skip type name */

            while (!strchr(" \t\r\n", *SubSubString))
            {
                SubSubString++;
            }

            /* skip spaces */

            while (strchr(" \t\r\n", *SubSubString))
            {
                SubSubString++;
            }

            if (*SubSubString == '{')
            {
                /* Remove the typedef itself */

                SubBuffer = SubString + strlen ("typedef") + 1;
                (void) AsRemoveData (SubString, SubBuffer);

                /* Find the opening brace of the struct or union */

                while (*SubString != '{')
                {
                    SubString++;
                }
                SubString++;

                /* Find the closing brace. Handles nested braces */

                NestLevel = 1;
                while (*SubString)
                {
                    if (*SubString == '{')
                    {
                        NestLevel++;
                    }
                    else if (*SubString == '}')
                    {
                        NestLevel--;
                    }

                    SubString++;

                    if (NestLevel == 0)
                    {
                        break;
                    }
                }

                /* Remove an extra line feed if present */

                if (!strncmp (SubString - 3, "\n\n", 2))
                {
                    *(SubString -2) = '}';
                    SubString--;
                }

                /* Find the end of the typedef name */

                SubBuffer = AsSkipUntilChar (SubString, ';');

                /* And remove the typedef name */

                SubBuffer = AsRemoveData (SubString, SubBuffer);
            }
            else
            {
                /* Skip the entire definition */

                SubString = strchr (SubString, ';') + 1;
                SubBuffer = SubString;
            }
        }
    }
}


/******************************************************************************
 *
 * FUNCTION:    AsRemoveEmptyBlocks
 *
 * DESCRIPTION: Remove any C blocks (e.g., if {}) that contain no code. This
 *              can happen as a result of removing lines such as DEBUG_PRINT.
 *
 ******************************************************************************/

void
AsRemoveEmptyBlocks (
    char                    *Buffer,
    char                    *Filename)
{
    char                    *SubBuffer;
    char                    *BlockStart;
    BOOLEAN                 EmptyBlock = TRUE;
    BOOLEAN                 AnotherPassRequired = TRUE;
    UINT32                  BlockCount = 0;


    while (AnotherPassRequired)
    {
        SubBuffer = Buffer;
        AnotherPassRequired = FALSE;

        while (*SubBuffer)
        {
            if (*SubBuffer == '{')
            {
                BlockStart = SubBuffer;
                EmptyBlock = TRUE;

                SubBuffer++;
                while (*SubBuffer != '}')
                {
                    if ((*SubBuffer != ' ') &&
                        (*SubBuffer != '\n'))
                    {
                        EmptyBlock = FALSE;
                        break;
                    }

                    SubBuffer++;
                }

                if (EmptyBlock)
                {
                    /* Find start of the first line of the block */

                    while (*BlockStart != '\n')
                    {
                        BlockStart--;
                    }

                    /* Find end of the last line of the block */

                    SubBuffer = AsSkipUntilChar (SubBuffer, '\n');
                    if (!SubBuffer)
                    {
                        break;
                    }

                    /* Remove the block */

                    SubBuffer = AsRemoveData (BlockStart, SubBuffer);
                    BlockCount++;
                    AnotherPassRequired = TRUE;
                    continue;
                }
            }

            SubBuffer++;
        }
    }

    if (BlockCount)
    {
        Gbl_MadeChanges = TRUE;
        AsPrint ("Code blocks deleted", BlockCount, Filename);
    }
}


/******************************************************************************
 *
 * FUNCTION:    AsRemoveDebugMacros
 *
 * DESCRIPTION: Remove all "Debug" macros -- macros that produce debug output.
 *
 ******************************************************************************/

void
AsRemoveDebugMacros (
    char                    *Buffer)
{
    AsRemoveConditionalCompile (Buffer, "ACPI_DEBUG_OUTPUT");

    AsRemoveStatement (Buffer, "ACPI_DEBUG_PRINT",      REPLACE_WHOLE_WORD);
    AsRemoveStatement (Buffer, "ACPI_DEBUG_PRINT_RAW",  REPLACE_WHOLE_WORD);
    AsRemoveStatement (Buffer, "DEBUG_EXEC",            REPLACE_WHOLE_WORD);
    AsRemoveStatement (Buffer, "FUNCTION_ENTRY",        REPLACE_WHOLE_WORD);
    AsRemoveStatement (Buffer, "PROC_NAME",             REPLACE_WHOLE_WORD);
    AsRemoveStatement (Buffer, "FUNCTION_TRACE",        REPLACE_SUBSTRINGS);
    AsRemoveStatement (Buffer, "DUMP_",                 REPLACE_SUBSTRINGS);

    AsReplaceString ("return_VOID",         "return", REPLACE_WHOLE_WORD, Buffer);
    AsReplaceString ("return_PTR",          "return", REPLACE_WHOLE_WORD, Buffer);
    AsReplaceString ("return_STR",          "return", REPLACE_WHOLE_WORD, Buffer);
    AsReplaceString ("return_ACPI_STATUS",  "return", REPLACE_WHOLE_WORD, Buffer);
    AsReplaceString ("return_acpi_status",  "return", REPLACE_WHOLE_WORD, Buffer);
    AsReplaceString ("return_VALUE",        "return", REPLACE_WHOLE_WORD, Buffer);
}


/******************************************************************************
 *
 * FUNCTION:    AsCleanupSpecialMacro
 *
 * DESCRIPTION: For special macro invocations (invoked without ";" at the end
 *              of the lines), do the following:
 *              1. Remove spaces appended by indent at the beginning of lines.
 *              2. Add an empty line between two special macro invocations.
 *
 ******************************************************************************/

void
AsCleanupSpecialMacro (
    char                    *Buffer,
    char                    *Keyword)
{
    char                    *SubString;
    char                    *SubBuffer;
    char                    *CommentEnd;
    int                     NewLine;
    int                     NestLevel;


    SubBuffer = Buffer;
    SubString = Buffer;

    while (SubString)
    {
        SubString = strstr (SubBuffer, Keyword);

        if (SubString)
        {
            /* Find start of the macro parameters */

            while (*SubString != '(')
            {
                SubString++;
            }

            SubString++;

            NestLevel = 1;
            while (*SubString)
            {
                if (*SubString == '(')
                {
                    NestLevel++;
                }
                else if (*SubString == ')')
                {
                    NestLevel--;
                }

                SubString++;

                if (NestLevel == 0)
                {
                    break;
                }
            }

SkipLine:

            /* Find end of the line */

            NewLine = FALSE;
            while (!NewLine && *SubString)
            {
                if (*SubString == '\n' && *(SubString - 1) != '\\')
                {
                    NewLine = TRUE;
                }

                SubString++;
            }

            /* Find end of the line */

            if (*SubString == '#' || *SubString == '\n')
            {
                goto SkipLine;
            }

            SubBuffer = SubString;

            /* Find start of the non-space */

            while (*SubString == ' ')
            {
                SubString++;
            }

            /* Find end of the line */

            if (*SubString == '#' || *SubString == '\n')
            {
                goto SkipLine;
            }

            /* Find end of the line */

            if (*SubString == '/' || *SubString == '*')
            {
                CommentEnd = strstr (SubString, "*/");
                if (CommentEnd)
                {
                    SubString = CommentEnd + 2;
                    goto SkipLine;
                }
            }

            SubString = AsRemoveData (SubBuffer, SubString);
        }
    }
}