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DBcellname.c

/*
 * DBcellname.c --
 *
 * CellUse/CellDef creation, deletion, naming.
 *
 *     ********************************************************************* 
 *     * Copyright (C) 1985, 1990 Regents of the University of California. * 
 *     * Permission to use, copy, modify, and distribute this              * 
 *     * software and its documentation for any purpose and without        * 
 *     * fee is hereby granted, provided that the above copyright          * 
 *     * notice appear in all copies.  The University of California        * 
 *     * makes no representations about the suitability of this            * 
 *     * software for any purpose.  It is provided "as is" without         * 
 *     * express or implied warranty.  Export of this software outside     * 
 *     * of the United States of America may require an export license.    * 
 *     *********************************************************************
 */

#ifndef lint
static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-7.5/database/DBcellname.c,v 1.8 2009/08/03 13:43:58 tim Exp $";
#endif  /* not lint */

#include <stdio.h>
#include <string.h>

#include "tcltk/tclmagic.h"
#include "utils/magic.h"
#include "utils/hash.h"
#include "utils/utils.h"
#include "utils/geometry.h"
#include "tiles/tile.h"
#include "database/database.h"
#include "database/databaseInt.h"
#include "select/select.h"
#include "utils/signals.h"
#include "utils/undo.h"
#include "utils/malloc.h"
#include "windows/windows.h"
#include "textio/textio.h"
#include "dbwind/dbwind.h"
#include "utils/main.h"
#include "drc/drc.h"

/*
 * Hash tables for CellDefs and CellUses
 */

#define     NCELLDEFBUCKETS   64    /* Initial number of buckets for CellDef tbl */
#define     NCELLUSEBUCKETS   128   /* Initial number of buckets for CellUse tbl */

HashTable dbCellDefTable;
HashTable dbUniqueDefTable;
HashTable dbUniqueNameTable;
bool dbWarnUniqueIds;

/*
 * Routines used before defined
 */
extern CellDef *DBCellDefAlloc();
extern int dbLinkFunc();
extern void dbUsePrintInfo();
extern void DBsetUseIdHash();
extern void DBUnLinkCell();

/*
 * Routines from other database modules
 */

extern void DBSetUseIdHash();

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellRename --
 *
 *    Rename a cell.  This differs from the "save" command in that the
 *    cell is not immediately written to disk.  However, the cell is
 *    marked as modified.
 *
 * Results:
 *    Return TRUE if the cell was successfully renamed.  Return FALSE
 *    otherwise.
 *
 * Side Effects:
 *    Cellname is changed.
 *
 * ----------------------------------------------------------------------------
 */
bool
DBCellRename(cellname, newname)
    char *cellname;
    char *newname;
{
    HashEntry *entry;
    CellDef *celldef;
    bool result;

    entry = HashLookOnly(&dbCellDefTable, cellname);
    if (entry == NULL)
    {
      TxError("No such cell \"%s\"\n",  cellname);
      return FALSE;
    }

    celldef = (CellDef *)HashGetValue(entry);
    if (celldef == NULL) return FALSE;

    if ((celldef->cd_flags & CDINTERNAL) == CDINTERNAL)
    {
      TxError("Attempt to rename internal cell \"%s\"\n", cellname);
      return FALSE;
    }

    /* Good to go! */

    UndoDisable();
    result = DBCellRenameDef(celldef, newname);
    DBWAreaChanged(celldef, &celldef->cd_bbox, DBW_ALLWINDOWS,
        (TileTypeBitMask *) NULL);
    UndoEnable();
    return result;
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBEnumerateTypes
 *
 *    Generate a mask of all known types in all known cells.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Returns the OR of the layer mask of each cell definition in
 *    the pointer to rMask.
 *
 * Notes:
 *    cd_types needs to be properly handled through paint/erase
 *    operations, or else we should not rely on cd_types.
 * ----------------------------------------------------------------------------
 */

void
DBEnumerateTypes(rMask)
    TileTypeBitMask *rMask;
{
    HashSearch hs;
    HashEntry *entry;
    CellDef *cellDef;
    
    TTMaskZero(rMask);
    HashStartSearch(&hs);
    while ((entry = HashNext(&dbCellDefTable, &hs)) != NULL)
    {
      cellDef = (CellDef *) HashGetValue(entry);
      if (cellDef != (CellDef *)NULL)
          if ((cellDef->cd_flags & CDINTERNAL) != CDINTERNAL)
            TTMaskSetMask(rMask, &cellDef->cd_types);
    }
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellDelete --
 *
 *    Destroy a cell.
 *
 * Results:
 *    Return TRUE if the cell was successfully eliminated.  Return FALSE
 *    if the cell could not be deleted (i.e., has dependencies).
 *
 * Side Effects:
 *    Frees memory.  May prompt the user to save, if the cell has been
 *    changed.
 *
 * ----------------------------------------------------------------------------
 */
bool
DBCellDelete(cellname, force)
    char *cellname;
    bool force;
{
    HashEntry *entry;
    CellDef *celldef;
    CellUse *celluse;
    bool result;

    entry = HashLookOnly(&dbCellDefTable, cellname);
    if (entry == NULL)
    {
      TxError("No such cell \"%s\"\n",  cellname);
      return FALSE;
    }

    celldef = (CellDef *)HashGetValue(entry);
    if (celldef == NULL) return FALSE;

    if ((celldef->cd_flags & CDINTERNAL) == CDINTERNAL)
    {
      TxError("Attempt to delete internal cell \"%s\"\n", cellname);
      return FALSE;
    }

    /* If the cell has any instances which are not top-level      */
    /* uses, don't allow the deletion.                      */

    for (celluse = celldef->cd_parents; celluse != (CellUse *) NULL;
            celluse = celluse->cu_nextuse)
      if (celluse->cu_parent != (CellDef *) NULL)
          if ((celluse->cu_parent->cd_flags & CDINTERNAL) != CDINTERNAL)
            break;

    if (celluse != (CellUse *)NULL)
    {
      TxError("Cell has non-top-level dependency in use \"%s\"\n",
            celluse->cu_id);
      return FALSE;
    }

    /* Cleared to delete. . . now prompt user if the cell has changes. */
    /* Last chance to save! */

    if ((force == FALSE) &&
      (celldef->cd_flags & (CDMODIFIED|CDBOXESCHANGED|CDSTAMPSCHANGED)))
    {
      static char *yesno[] = { "no", "yes", 0 };
      int code;
      char *prompt = TxPrintString("Cell %s has been modified.\n  Do you"
            " want to delete it and lose all changes? ",
            cellname);
      code = TxDialog(prompt, yesno, 0);
      if (code == 0) return FALSE;
    }

    /* If we're destroying the cell pointed to by dbUndoLastCell, we    */
    /* need to NULL it and flush the Undo queue.                  */

    DBUndoReset(celldef);

    /* If we're destroying "UNNAMED", then we want to rename it first   */
    /* so that WindUnload() will create a new one.                */ 

    if (!strcmp(cellname, UNNAMED))
      DBCellRename(cellname, "__UNNAMED__");

    /* For all top-level cell uses, check if any windows have this      */
    /* use.  If so, load the window with (UNNAMED).               */

    UndoDisable();
    for (celluse = celldef->cd_parents; celluse != (CellUse *) NULL;
            celluse = celluse->cu_nextuse)
    {
      if (celluse->cu_parent == (CellDef *) NULL)
      {
          WindUnload(celluse);
          freeMagic(celluse->cu_id);
      }
      freeMagic((char *)celluse);
    }
    celldef->cd_parents = (CellUse *)NULL;

    result = DBCellDeleteDef(celldef);

    if (result == FALSE)
      TxError("Error:  Deleted all cell uses, but could not delete cell.\n");

    UndoEnable();
    return result;
}



/*
 * ----------------------------------------------------------------------------
 *
 * DBCellInit --
 *
 * Initialize the world of the cell.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Sets up the symbol tables for CellDefs and CellUses.
 *
 * ----------------------------------------------------------------------------
 */

void
DBCellInit()
{
    HashInit(&dbCellDefTable, NCELLDEFBUCKETS, 0);
}

/*
 * ----------------------------------------------------------------------------
 *
 * dbGetUseName --
 *
 *    Returns the name of the indicated cell use.  If the use is part of
 *    an array, it returns the largest array member in x, y, or both.
 *
 * Results:
 *    An allocated char * array which must be free'd using freeMagic().
 *
 * ----------------------------------------------------------------------------
 */
 
char *
dbGetUseName(celluse)
   CellUse *celluse;
{
    char *useID, *newID, xbuf[10], ybuf[10];
    int arxl, aryl, arxh, aryh;
    int newsize;
    bool isx, isy;

    arxl = celluse->cu_array.ar_xlo;
    aryl = celluse->cu_array.ar_ylo;
    arxh = celluse->cu_array.ar_xhi;
    aryh = celluse->cu_array.ar_yhi;

    isx = (arxh == arxl) ? FALSE : TRUE;
    isy = (aryh == aryl) ? FALSE : TRUE;

    xbuf[0] = '\0';
    ybuf[0] = '\0';

    useID = celluse->cu_id;
    newsize = strlen(useID) + 1;
    if (isx || isy)
    {
      newsize += 4;
      if (isx && isy) newsize += 1;
      if (isx)
      {
          snprintf(xbuf, 9, "%d", arxl);
          newsize += strlen(xbuf);
      }
      if (isy)
      {
          snprintf(ybuf, 9, "%d", aryl);
          newsize += strlen(ybuf);
      }
    }
   
    newID = (char *)mallocMagic(newsize);
    strcpy(newID, useID);
    if (isx || isy)
    {
      strcat(newID, "\\[");
      if (isx) strcat(newID, xbuf);
      if (isx && isy) strcat(newID, ",");
      if (isy) strcat(newID, ybuf);
      strcat(newID, "\\]");
    }
    return (newID);
}


/*
 * ----------------------------------------------------------------------------
 *
 * dbCellPrintInfo --
 *
 *    This is the working function for DBCellPrint.
 *
 * Results:
 *    None (Tcl returns list if "dolist" is true in magic Tcl version).
 *
 * Side effects:
 *    Stuff is printed.
 *
 * ----------------------------------------------------------------------------
 */

void
dbCellPrintInfo(StartDef, who, dolist)
    CellDef *StartDef;
    int who;
    bool dolist;
{
    HashSearch hs;
    HashEntry *entry;
    CellDef *celldef;
    CellUse *celluse;
    char *cu_name;
    bool topdone;

    switch (who) {
      case SELF:

          if (StartDef->cd_name == NULL)
          {
              if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, "1");
#else
                TxPrintf("TRUE\n");
#endif
            else
                TxPrintf("Cell is currently loaded.\n");
          }
          else
          {
            if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, StartDef->cd_name);
#else
                TxPrintf("%s\n", StartDef->cd_name);
#endif
            else
                TxPrintf("Cell %s is currently loaded.\n", StartDef->cd_name);
          }
          break;

      case OTHER:
          if (!dolist)
            TxPrintf("Names of cell instances:\n");

          for (celluse = StartDef->cd_parents; celluse != NULL;
                  celluse = celluse->cu_nextuse)
          {
            if ((celluse->cu_parent != NULL) &&
                  ((celluse->cu_parent->cd_flags & CDINTERNAL)
                  == CDINTERNAL))
                continue;

            if (celluse->cu_id != NULL)
            {
                cu_name = dbGetUseName(celluse);
                if (dolist)
#ifdef MAGIC_WRAPPER
                  Tcl_AppendElement(magicinterp, cu_name);
#else
                  TxPrintf("%s\n", cu_name);
#endif
                else
                  TxPrintf("    %s\n", cu_name);
                freeMagic(cu_name);
            }
          }
          break;

      case CHILDINST:
          if (!dolist)
            TxPrintf("Def %s's children are:\n", StartDef->cd_name);

          HashStartSearch(&hs);
          while ((entry = HashNext(&StartDef->cd_idHash, &hs)) != NULL)
          {
            celluse = (CellUse *)HashGetValue(entry);
            if (celluse != (CellUse *)NULL)
                dbCellUsePrintFunc(celluse, &dolist);
          }
          break;

      case PARENTS:

          /*
           *
           * Print out a list of all the parents by scanning the 'use' list.
           *
           */

          if (StartDef->cd_name == NULL && (!dolist))
          {
            TxPrintf("Cell's parents are:\n");
          }
          else if (!dolist)
          {
            TxPrintf("Cell %s's parents are:\n", StartDef->cd_name);
          }
          for (celluse = StartDef->cd_parents; celluse != (CellUse *) NULL;
                  celluse = celluse->cu_nextuse)
          {
            if (celluse->cu_parent != (CellDef *) NULL)
            {
                celluse->cu_parent->cd_client = (ClientData) 1;
            }
          }
          for (celluse = StartDef->cd_parents; celluse != (CellUse *) NULL;
                  celluse = celluse->cu_nextuse)
          {
            if (celluse->cu_parent != (CellDef *) NULL)
            {
                if (celluse->cu_parent->cd_client == (ClientData) 1)
                {
                  celluse->cu_parent->cd_client = (ClientData) NULL;
                  if ( (celluse->cu_parent->cd_flags & CDINTERNAL)
                              != CDINTERNAL)
                  {
                      if (dolist)
#ifdef MAGIC_WRAPPER
                        Tcl_AppendElement(magicinterp,
                              celluse->cu_parent->cd_name);
#else
                        TxPrintf("%s ", celluse->cu_parent->cd_name);
#endif
                      else
                        TxPrintf("    %s\n", celluse->cu_parent->cd_name);
                  }
                }
            }
          }
          break;

      case CHILDREN:

          /*
           *
           * Print out a list of all the children by checking all the cells.
           *
           */

          if (StartDef->cd_name == NULL && (!dolist))
          {
            TxPrintf("Cell's children are:\n");
          }
          else if (!dolist)
          {
            TxPrintf("Cell %s's children are:\n", StartDef->cd_name);
          }
          HashStartSearch(&hs);
          while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
          {
            celldef = (CellDef *) HashGetValue(entry);
            if (!celldef) continue;
            for (celluse = celldef->cd_parents; celluse != (CellUse *) NULL;
                  celluse = celluse->cu_nextuse)
            {
                if (celluse->cu_parent == StartDef)
                {
                  if (dolist)
#ifdef MAGIC_WRAPPER
                      Tcl_AppendElement(magicinterp, celldef->cd_name);
#else
                        TxPrintf("%s ", celldef->cd_name);
#endif
                  else
                        TxPrintf("    %s\n", celldef->cd_name);
                  break;
                }
            }
          }
          break;
    }  /* endswitch */
}



/*
 * ----------------------------------------------------------------------------
 *
 * DBTopPrint --
 *
 *    This routine prints the cell definition name of the topmost instance
 *    in the window.
 *
 * ----------------------------------------------------------------------------
 */
void
DBTopPrint(mw, dolist)
    MagWindow *mw;
    bool dolist;
{
    CellDef *celldef;
    CellUse *celluse;

    if (mw == NULL)
    {
      TxError("No window was selected for search.\n");
    }
    else
    {
      celluse = (CellUse *)mw->w_surfaceID;
      celldef = celluse->cu_def;

      if (celldef == NULL) return;
#ifdef MAGIC_WRAPPER
      if (dolist)
          Tcl_AppendElement(magicinterp, celldef->cd_name);
      else
#endif
      TxPrintf("Top-level cell in the window is: %s\n", celldef->cd_name);
    }
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellPrint --
 *
 *    This routine prints out cell names.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Stuff is printed.
 *
 * Notes: "who" takes one of the options defined in database.h:
 *    PARENTS, CHILDREN, SELF, OTHER, ALLCELLS, or TOPCELLS.
 *    "SELF" lists celldef names (most useful to list the name of
 *    a selected cell).  "OTHER" lists instance names.
 *
 * ----------------------------------------------------------------------------
 */

void
DBCellPrint(CellName, who, dolist)
    char *CellName;
    int who;
    bool dolist;
{
    int found;
    HashSearch hs;
    HashEntry *entry;
    CellDef *celldef;
    CellUse *celluse;
    
    switch (who)
    {
      case ALLCELLS:
          /*
           * Print the name of all the 'known' cells.
           */

          if (!dolist) TxPrintf("Cell currently loaded:\n");
          HashStartSearch(&hs);
          while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
          {
            celldef = (CellDef *) HashGetValue(entry);
            if (celldef != (CellDef *) NULL)
            {
                if ( (celldef->cd_flags & CDINTERNAL) != CDINTERNAL)
                {
                  if (celldef->cd_name != NULL)
                  {
                      if (dolist)
#ifdef MAGIC_WRAPPER
                          Tcl_AppendElement(magicinterp, celldef->cd_name);
#else
                          TxPrintf("%s ", celldef->cd_name);
#endif
                      else
                          TxPrintf("    %s\n", celldef->cd_name);
                    }
                }
              }
          }
          break;

      case TOPCELLS:
          /*
           * Print the name of all the 'top' cells.
           */

          if (!dolist) TxPrintf("Top level cells are:\n");
          HashStartSearch(&hs);
          while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
          {
            celldef = (CellDef *) HashGetValue(entry);
            if (celldef != (CellDef *) NULL)
            {
                if ( (celldef->cd_flags & CDINTERNAL) != CDINTERNAL)
                {
                  found = 0;
                  for (celluse = celldef->cd_parents;
                        celluse != (CellUse *) NULL;
                        celluse = celluse->cu_nextuse)
                    {
                      if (celluse->cu_parent != (CellDef *) NULL)
                      {
                          if ( (celluse->cu_parent->cd_flags & CDINTERNAL)
                              != CDINTERNAL)
                          {
                            found = 1;
                            break;
                          }
                      }
                    }
                    if ( (found == 0) && (celldef->cd_name != NULL) )
                    {
                      if (dolist)
#ifdef MAGIC_WRAPPER
                          Tcl_AppendElement(magicinterp, celldef->cd_name);
#else
                          TxPrintf("%s ", celldef->cd_name);
#endif
                      else
                          TxPrintf("    %s\n", celldef->cd_name);
                    }
                }
              }
          }
          break;

      default:

         /*
          * Check to see if a cell name was specified. If not,
          * search for selected cells.
          */

          if (CellName == NULL)
          {
            found = 0;
            HashStartSearch(&hs);
            while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
            {
                celldef = (CellDef *) HashGetValue(entry);
                if (celldef != (CellDef *) NULL)
                {
                  for (celluse = celldef->cd_parents;
                        celluse != (CellUse *) NULL;
                        celluse = celluse->cu_nextuse)
                  {
                      if (celluse->cu_parent == SelectDef)
                      {
                        dbCellPrintInfo(celldef, who, dolist);
                        found = 1;
                        break;
                      }
                  }
                }
            }
            if (found == 0)
            {
                if (!dolist)
                  TxPrintf("No cells selected.\n");
            }
          }
          else
          {
            celldef = DBCellLookDef(CellName);
            if (celldef == (CellDef *) NULL)
            {
                if (dolist)
#ifdef MAGIC_WRAPPER
                  Tcl_AppendElement(magicinterp, "0");
#else
                  TxPrintf("Not loaded\n");
#endif
                else
                    TxError("Cell %s is not currently loaded.\n", CellName);
            }
            else
            {
                dbCellPrintInfo(celldef, who, dolist);
            }
          }
          break;
    } /* endswitch */
}

/*
 * ----------------------------------------------------------------------------
 *
 * dbUsePrintInfo --
 *
 *    This is the working function for DBUsePrint.
 *
 * Results:
 *    None (Tcl returns list if "dolist" is true in magic Tcl version).
 *
 * Side effects:
 *    Stuff is printed.
 *
 * ----------------------------------------------------------------------------
 */

void
dbUsePrintInfo(StartUse, who, dolist)
    CellUse *StartUse;
    int who;
    bool dolist;
{
    CellDef *celldef;
    CellUse *celluse;
    char *cu_name;
    HashSearch hs;
    HashEntry *entry;

    int dbCellUsePrintFunc();

    /* fprintf(stderr, "dbCellUseInfo called with %s, %d, %s\n",
     *      StartUse->cu_id == NULL ? "(unnamed)" : StartUse->cu_id,
     *      who, (dolist) ? "list" : "no list" );
     * fflush(stderr);
     */

    switch (who) {
      case SELF:
          if (StartUse->cu_id == NULL)
          {
              if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, "1");
#else
                TxPrintf("TRUE\n");
#endif
            else
                TxPrintf("Use is currently loaded.\n");
          }
          else
          {
            cu_name = dbGetUseName(StartUse);
            if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, cu_name);
#else
                TxPrintf("%s\n", cu_name);
#endif
            else
                TxPrintf("Use %s is currently loaded.\n", cu_name);
            freeMagic(cu_name);
          }
          break;

      case OTHER:
          if (StartUse->cu_def->cd_name == NULL)
          {
              if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, "0");
#else
                TxPrintf("FALSE\n");
#endif
            else
                TxPrintf("Cell definition has no name.\n");
          }
          else
          {
              if (dolist)
#ifdef MAGIC_WRAPPER
                Tcl_AppendElement(magicinterp, StartUse->cu_def->cd_name);
#else
                TxPrintf("%s\n", StartUse->cu_def->cd_name);
#endif
            else
                TxPrintf("Cell definition is %s.\n", StartUse->cu_def->cd_name);
          }
          break;

      case PARENTS:

          /*
           *
           * Print out a list of all the parents by scanning the 'use' list.
           *
           */

          if (StartUse->cu_id == NULL && (!dolist))
          {
            TxPrintf("Use's parent is:\n");
          }
          else if (!dolist)
          {
            cu_name = dbGetUseName(StartUse);
            TxPrintf("Use %s's parent is:\n", cu_name);
            freeMagic(cu_name);
          }
          if (StartUse->cu_parent != (CellDef *) NULL)
          {
            if ((StartUse->cu_parent->cd_flags & CDINTERNAL)
                              != CDINTERNAL)
            {
                if (dolist)
#ifdef MAGIC_WRAPPER
                  Tcl_AppendElement(magicinterp,
                        StartUse->cu_parent->cd_name);
#else
                  TxPrintf("%s ", StartUse->cu_parent->cd_name);
#endif
                else
                  TxPrintf("    %s\n", StartUse->cu_parent->cd_name);
            }
          }
          break;

      case CHILDREN:

          /*
           *
           * Print out a list of all the children by checking all the cells.
           *
           */

          if (StartUse->cu_id == NULL && (!dolist))
          {
            TxPrintf("Use's children are:\n");
          }
          else if (!dolist)
          {
            cu_name = dbGetUseName(StartUse);
            TxPrintf("Use %s's children are:\n", cu_name);
            freeMagic(cu_name);
          }
          celldef = StartUse->cu_def;
          HashStartSearch(&hs);
          while ((entry = HashNext(&celldef->cd_idHash, &hs)) != NULL)
          {
            celluse = (CellUse *)HashGetValue(entry);
            if (celluse != (CellUse *)NULL)
                dbCellUsePrintFunc(celluse, &dolist);
          }
          break;
    }  /* endswitch */
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBUsePrint --
 *
 *    This routine prints out cell use names.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Stuff is printed.
 *
 * Notes: "who" takes one of the options defined in database.h:
 *    PARENTS, CHILDREN, SELF, OTHER, or ALLCELLS.
 *    "SELF" lists instance names (most useful to list the name of
 *    a selected instance).  "OTHER" lists the celldef name of the
 *    instance.
 *
 * ----------------------------------------------------------------------------
 */

void
DBUsePrint(CellName, who, dolist)
    char *CellName;
    int who;
    bool dolist;
{
    int found;
    HashSearch hs;
    HashEntry *entry;
    CellDef *celldef;
    CellUse *celluse;

    int dbCellUsePrintFunc();
    
    switch (who)
    {
      case ALLCELLS:
          /*
           * Print the name of all the 'known' cell uses (hierarchical names).
           */

          break;

      default:

         /*
          *
          * Check to see if a cell name was specified. If not,
          * search for selected cells.
          *
          */

          if (CellName == NULL)
          {
            found = 0;
            HashStartSearch(&hs);
            while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
            {
                celldef = (CellDef *) HashGetValue(entry);
                if (celldef != (CellDef *) NULL)
                {
                  for (celluse = celldef->cd_parents;
                        celluse != (CellUse *) NULL;
                        celluse = celluse->cu_nextuse)
                  {
                      if (celluse->cu_parent == SelectDef)
                      {
                        dbUsePrintInfo(celluse, who, dolist);
                        found = 1;
                      }
                  }
                }
            }
            if (found == 0)
                if (!dolist)
                    TxPrintf("No cells selected.\n");
          }
          else
          {
            SearchContext scx;

            bzero(&scx, sizeof(SearchContext));
            found = 0;

            HashStartSearch(&hs);
            while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
            {
                CellUse fakeuse;
                celldef = (CellDef *) HashGetValue(entry);
                if ((celldef != (CellDef *) NULL) &&
                        (!(celldef->cd_flags & CDINTERNAL)))
                {
                  /* DBTreeFindUse() should really take a def, not a use */
                  fakeuse.cu_def = celldef;
                  DBTreeFindUse(CellName, celluse, &scx);
                  if (scx.scx_use != NULL) break;
                }
            }

            if (scx.scx_use == NULL)
            {
                if (!dolist)
                    TxError("Cell %s is not currently loaded.\n", CellName);
            }
            else
            {
                dbUsePrintInfo(scx.scx_use, who, dolist);
            }
          }
          break;

    } /* endswitch */
}

int
dbCellUsePrintFunc(cellUse, dolist)
    CellUse *cellUse;
    bool *dolist;
{
    char *cu_name;

    if (cellUse->cu_id != NULL)
    {
      cu_name = dbGetUseName(cellUse);
      if (*dolist)
#ifdef MAGIC_WRAPPER
            Tcl_AppendElement(magicinterp, cu_name);
#else
          TxPrintf("%s ", cu_name);
#endif
      else
          TxPrintf("    %s\n", cu_name);
      freeMagic(cu_name);
    }
    return 0;
}

/*
 *  dbLockUseFunc()
 */

int
dbLockUseFunc(selUse, use, transform, data)
    CellUse *selUse;    /* Use from selection cell */
    CellUse *use; /* Use from layout corresponding to selection */
    Transform *transform;
    ClientData data;
{
    bool dolock = *((bool *)data);

    if (EditCellUse && !DBIsChild(use, EditCellUse))
    {
      TxError("Cell %s (%s) isn't a child of the edit cell.\n",
            use->cu_id, use->cu_def->cd_name);
      return 0;
    }
    if ((dolock && (use->cu_flags & CU_LOCKED)) ||
            (!dolock && !(use->cu_flags & CU_LOCKED)))
      return 0;   /* nothing to do */

    if (UndoIsEnabled()) DBUndoCellUse(use, UNDO_CELL_LOCKDOWN);
    if (dolock) use->cu_flags |= CU_LOCKED;
    else use->cu_flags &= ~CU_LOCKED;
    if (UndoIsEnabled()) DBUndoCellUse(use, UNDO_CELL_LOCKDOWN);

    if (selUse != NULL)
    {
      if (dolock) selUse->cu_flags |= CU_LOCKED;
      else selUse->cu_flags &= ~CU_LOCKED;
    }

    DBWAreaChanged(use->cu_parent, &use->cu_bbox,
      (int) ~(use->cu_expandMask), &DBAllButSpaceBits);
    DBWHLRedraw(EditRootDef, &selUse->cu_bbox, TRUE);
    return 0;
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBLockUse --
 *
 *    This routine sets or clears a cell instance's lock flag
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    cu_flags changed for indicated cell use.
 *
 * ----------------------------------------------------------------------------
 */

void
DBLockUse(UseName, bval)
    char *UseName;
    bool bval;
{
    int found;
    HashSearch hs;
    HashEntry *entry;
    CellDef *celldef;
    CellUse *celluse;

    int dbUseLockFunc();
    
   /*
    *
    * Check to see if a cell name was specified. If not,
    * search for selected cells.
    *
    */

    if (UseName == NULL)
    {
      if (EditCellUse == NULL)
          TxError("Cannot set lock in a non-edit cell!\n");
      else
          SelEnumCells(TRUE, (int *)NULL, (SearchContext *)NULL,
                  dbLockUseFunc, (ClientData)&bval);
    }
    else
    {
      SearchContext scx;

      bzero(&scx, sizeof(SearchContext));
      found = 0;

      HashStartSearch(&hs);
      while( (entry = HashNext(&dbCellDefTable, &hs)) != NULL)
      {
          celldef = (CellDef *) HashGetValue(entry);
          if (celldef != (CellDef *) NULL)
          {
            celluse = celldef->cd_parents;   /* only need one */
            if (celluse != (CellUse *)NULL) {
                DBTreeFindUse(UseName, celluse, &scx);
                if (scx.scx_use != NULL) break;
            }
          }
      }

      if (scx.scx_use == NULL)
          TxError("Cell %s is not currently loaded.\n", UseName);
      else
          dbLockUseFunc(NULL, scx.scx_use, NULL, (ClientData)&bval);
    }
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellLookDef --
 *
 * Find the definition of the cell with the given name.
 *
 * Results:
 *    Returns a pointer to the CellDef with the given name if it
 *    exists.  Otherwise, returns (CellDef *) NULL.
 *
 * Side effects:
 *    None.
 * ----------------------------------------------------------------------------
 */

CellDef *
DBCellLookDef(cellName)
    char *cellName;
{
    HashEntry *entry;

    entry = HashFind(&dbCellDefTable, cellName);
    return ((CellDef *) HashGetValue(entry));
}


/*
 * ----------------------------------------------------------------------------
 *
 * DBCellNewDef --
 *
 * Create a new cell definition with the given name.  There must not
 * be any cells already known with the same name.
 *
 * Results:
 *    Returns a pointer to the newly created CellDef.  The CellDef
 *    is completely initialized, showing no uses and having all
 *    tile planes initialized via TiNewPlane() to contain a single
 *    space tile.  The filename associated with the cell is set to
 *    the name supplied, but no attempt is made to open it or create
 *    it.
 *
 *    If the cellName supplied is NULL, the cell is entered into
 *    the symbol table with a name of UNNAMED.
 *
 *    Returns NULL if a cell by the given name already exists.
 *
 * Side effects:
 *    The name of the CellDef is entered into the symbol table
 *    of known cells.
 *
 * ----------------------------------------------------------------------------
 */

CellDef *
DBCellNewDef(cellName, cellFileName)
    char *cellName;           /* Name by which the cell is known */
    char *cellFileName;       /* Name of disk file in which the cell 
                         * should be kept when written out.
                         */
{
    CellDef *cellDef;
    HashEntry *entry;

    if (cellName == (char *) NULL)
      cellName = UNNAMED;

    entry = HashFind(&dbCellDefTable, cellName);
    if (HashGetValue(entry) != (ClientData) NULL)
      return ((CellDef *) NULL);

    cellDef = DBCellDefAlloc();
    HashSetValue(entry, (ClientData) cellDef);
    cellDef->cd_name = StrDup((char **) NULL, cellName);
    if (cellFileName == (char *) NULL)
      cellDef->cd_file = cellFileName;
    else
      cellDef->cd_file = StrDup((char **) NULL, cellFileName);
    return (cellDef);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellDefAlloc --
 *
 * Create a new cell definition structure.  The new def is not added
 * to any symbol tables.
 *
 * Results:
 *    Returns a pointer to the newly created CellDef.  The CellDef
 *    is completely initialized, showing no uses and having all
 *    tile planes initialized via TiNewPlane() to contain a single
 *    space tile.
 *
 * Side effects:
 *    None.
 *
 * ----------------------------------------------------------------------------
 */

CellDef *
DBCellDefAlloc()
{
    CellDef *cellDef;
    int pNum;

    cellDef = (CellDef *) mallocMagic((unsigned) (sizeof (CellDef)));
    cellDef->cd_flags = 0;
    cellDef->cd_bbox.r_xbot = 0;
    cellDef->cd_bbox.r_ybot = 0;
    cellDef->cd_bbox.r_xtop = 1;
    cellDef->cd_bbox.r_ytop = 1;
    cellDef->cd_name = (char *) NULL;
    cellDef->cd_file = (char *) NULL;
#ifdef FILE_LOCKS
    cellDef->cd_fd = -1;
#endif
    cellDef->cd_parents = (CellUse *) NULL;
    cellDef->cd_labels = (Label *) NULL;
    cellDef->cd_lastLabel = (Label *) NULL;
    cellDef->cd_client = (ClientData) 0;
    cellDef->cd_props = (ClientData) NULL;
    cellDef->cd_timestamp = 0;
    TTMaskZero(&cellDef->cd_types);
    HashInit(&cellDef->cd_idHash, 16, HT_STRINGKEYS);

    cellDef->cd_planes[PL_CELL] = DBNewPlane((ClientData) NULL);
    for (pNum = PL_PAINTBASE; pNum < DBNumPlanes; pNum++)
      cellDef->cd_planes[pNum] = DBNewPlane((ClientData) TT_SPACE);

    /* Definitively zero out all other plane entries */
    for (pNum = DBNumPlanes; pNum < MAXPLANES; pNum++)
      cellDef->cd_planes[pNum] = NULL;

    return (cellDef);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellNewUse --
 *
 * Create a new cell use of the supplied CellDef.
 *
 * Results:
 *    Returns a pointer to the new CellUse.  The CellUse is initialized
 *    to reflect that cellDef is its definition.  The transform is
 *    initialized to the identity, and the parent pointer initialized
 *    to NULL.
 *
 * Side effects:
 *    Updates the use list for cellDef.
 *
 * ----------------------------------------------------------------------------
 */

CellUse *
DBCellNewUse(cellDef, useName)
    CellDef *cellDef;   /* Pointer to definition of the cell */
    char *useName;      /* Pointer to use identifier for the cell.  This may
                   * be NULL, in which case a unique use identifier is
                   * generated automatically when the cell use is linked
                   * into a parent def.
                   */
{
    CellUse *cellUse;

    cellUse = (CellUse *) mallocMagic((unsigned) (sizeof (CellUse)));
    cellUse->cu_id = StrDup((char **) NULL, useName);
    cellUse->cu_flags = (unsigned char)0;
    cellUse->cu_expandMask = 0;
    cellUse->cu_transform = GeoIdentityTransform;
    cellUse->cu_def = cellDef;
    cellUse->cu_parent = (CellDef *) NULL;
    cellUse->cu_xlo = 0;
    cellUse->cu_ylo = 0;
    cellUse->cu_xhi = 0;
    cellUse->cu_yhi = 0;
    cellUse->cu_xsep = 0;
    cellUse->cu_ysep = 0;
    cellUse->cu_nextuse = cellDef->cd_parents;

    /* Initial client field */
    /* (commands can use this field for whatever
     * they like, but should restore its value to CLIENTDEFAULT before exiting.) 
     */
    cellUse->cu_client = (ClientData) CLIENTDEFAULT;

    cellDef->cd_parents = cellUse;
    DBComputeUseBbox(cellUse);
    return (cellUse);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellRenameDef --
 *
 * Renames the indicated CellDef.
 *
 * Results:
 *    TRUE if successful, FALSE if the new name was not unique.
 *
 * Side effects:
 *    The name of the CellDef is entered into the symbol table
 *    of known cells.  The CDMODIFIED bit is set in the flags
 *    of each of the parents of the CellDef to force them to
 *    be written out using the new name.
 *
 * ----------------------------------------------------------------------------
 */

bool
DBCellRenameDef(cellDef, newName)
    CellDef *cellDef;         /* Pointer to CellDef being renamed */
    char *newName;            /* Pointer to new name */
{
    HashEntry *oldEntry, *newEntry;
    CellUse *parent;

    oldEntry = HashFind(&dbCellDefTable, cellDef->cd_name);
    ASSERT(HashGetValue(oldEntry) == (ClientData) cellDef, "DBCellRenameDef");

    newEntry = HashFind(&dbCellDefTable, newName);
    if (HashGetValue(newEntry) != (ClientData) NULL)
      return (FALSE);

    HashSetValue(oldEntry, (ClientData) NULL);
    HashSetValue(newEntry, (ClientData) cellDef);
    (void) StrDup(&cellDef->cd_name, newName);

    for (parent = cellDef->cd_parents; parent; parent = parent->cu_nextuse)
      if (parent->cu_parent)
          parent->cu_parent->cd_flags |= CDMODIFIED|CDGETNEWSTAMP;

    return (TRUE);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellDeleteDef --
 *
 * Removes the CellDef from the symbol table of known CellDefs and
 * frees the storage allocated to the CellDef.  The CellDef must have
 * no CellUses.
 *
 * Results:
 *    TRUE if successful, FALSE if there were any outstanding
 *    CellUses found.
 *
 * Side effects:
 *    The CellDef is removed from the table of known CellDefs.
 *    All storage for the CellDef and its tile planes is freed.
 *
 * ----------------------------------------------------------------------------
 */

bool
DBCellDeleteDef(cellDef)
    CellDef *cellDef;         /* Pointer to CellDef to be deleted */
{
    HashEntry *entry;

    if (cellDef->cd_parents != (CellUse *) NULL)
      return (FALSE);

    entry = HashFind(&dbCellDefTable, cellDef->cd_name);
    ASSERT(HashGetValue(entry) == (ClientData) cellDef, "DBCellDeleteDef");
    HashSetValue(entry, (ClientData) NULL);
    if (cellDef->cd_props)
      DBPropClearAll(cellDef);

    /* Need to check the DRC pending queue, and remove      */
    /* this cell if it's there.                       */
    DRCRemovePending(cellDef);

    DBCellDefFree(cellDef);
    return TRUE;
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellDefFree --
 *
 *    Does all the dirty work of freeing up stuff inside a celldef.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    All memory associated with the cellDef is freed.  This may
 *    cause lower-level cellUses and defs to be freed up.  This
 *    procedure is separated from DBDeleteCellDef so that it can
 *    be used for cells that aren't in the hash table (e.g. cells
 *    used by the window manager).
 *
 * ----------------------------------------------------------------------------
 */

void
DBCellDefFree(cellDef)
    CellDef *cellDef;

{
    int pNum;
    Label *lab;

    if (cellDef->cd_file != (char *) NULL)
      freeMagic(cellDef->cd_file);
    if (cellDef->cd_name != (char *) NULL)
      freeMagic(cellDef->cd_name);

    /*
     * We want the following searching to be non-interruptible
     * to guarantee that all storage gets freed.
     */

    SigDisableInterrupts();
    DBFreeCellPlane(cellDef->cd_planes[PL_CELL]);
    TiFreePlane(cellDef->cd_planes[PL_CELL]);

    for (pNum = PL_PAINTBASE; pNum < DBNumPlanes; pNum++)
    {
      DBFreePaintPlane(cellDef->cd_planes[pNum]);
      TiFreePlane(cellDef->cd_planes[pNum]);
      cellDef->cd_planes[pNum] = (Plane *) NULL;
    }

    for (lab = cellDef->cd_labels; lab; lab = lab->lab_next)
      freeMagic((char *) lab);
    SigEnableInterrupts();
    HashKill(&cellDef->cd_idHash);

    freeMagic((char *) cellDef);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellDeleteUse --
 *
 * Frees the storage allocated to the CellUse.
 *
 * It is required that the CellUse has been removed from any CellTileBodies
 * in the subcell plane of its parent.  The parent pointer for this
 * CellUse must therefore be NULL.
 *
 * Results:
 *    TRUE if the CellUse was successfully removed, FALSE if
 *    the parent pointer were not NULL.
 *
 * Side effects:
 *    All storage for the CellUse is freed.
 *    The list of all CellUses associated with a given CellDef is
 *    updated to reflect the absence of the deleted CellUse.
 *
 * ----------------------------------------------------------------------------
 */

bool
DBCellDeleteUse(cellUse)
    CellUse *cellUse;         /* Pointer to CellUse to be deleted */
{
    CellDef *cellDef;
    CellUse *useptr;

    if (cellUse->cu_parent != (CellDef *) NULL)
      return (FALSE);

    cellDef = cellUse->cu_def;
    if (cellUse->cu_id != (char *) NULL)
      freeMagic(cellUse->cu_id);
    cellUse->cu_id = (char *) NULL;
    cellUse->cu_def = (CellDef *) NULL;

    ASSERT(cellDef->cd_parents != (CellUse *) NULL, "DBCellDeleteUse");

    if (cellDef->cd_parents == cellUse)
      cellDef->cd_parents = cellUse->cu_nextuse;
    else for (useptr = cellDef->cd_parents;  useptr != NULL;
      useptr = useptr->cu_nextuse)
    {
      if (useptr->cu_nextuse == cellUse)
      {
          useptr->cu_nextuse = cellUse->cu_nextuse;
          break;
      }
    }

    freeMagic((char *) cellUse);
    return (TRUE);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBCellSrDefs --
 *
 * Search for all cell definitions matching a given pattern.
 * For each cell definition whose flag word contains any of the
 * bits in pattern, the supplied procedure is invoked.
 *
 * The procedure should be of the following form:
 *    int
 *    func(cellDef, cdata)
 *        CellDef *cellDef;
 *        ClientData cdata;
 *    {
 *    }
 * Func should normally return 0.  If it returns 1 then the
 * search is aborted.
 *
 * Results:
 *    Returns 1 if the search completed normally, 1 if it aborted.
 *
 * Side effects:
 *    Whatever the user-supplied procedure does.
 *
 * ----------------------------------------------------------------------------
 */

int
DBCellSrDefs(pattern, func, cdata)
    int pattern;  /* Used for selecting cell definitions.  If any
                   * of the bits in the pattern are in a def->cd_flags,
                   * or if pattern is 0, the user-supplied function
                   * is invoked.  
                   */
    int (*func)();      /* Function to be applied to each matching CellDef */
    ClientData cdata;   /* Client data also passed to function */
{
    HashSearch hs;
    HashEntry *he;
    CellDef *cellDef;

    HashStartSearch(&hs);
    while ((he = HashNext(&dbCellDefTable, &hs)) != (HashEntry *) NULL)
    {
      cellDef = (CellDef *) HashGetValue(he);
      if (cellDef == (CellDef *) NULL)
          continue;
      if ((pattern != 0) && !(cellDef->cd_flags & pattern))
          continue;
      if ((*func)(cellDef, cdata)) return 1;
    }
    return 0;
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBLinkCell --
 *
 * Set the cu_id for the supplied CellUse appropriately for linking into
 * the parent CellDef.  If the cu_id is NULL, a cu_id unique within the
 * CellDef is automatically generated and stored in cu_id; otherwise, the
 * one supplied in cu_id is used.
 *
 *                *** WARNING ***
 *
 * This operation is not recorded on the undo list, as it always accompanies
 * the creation of a new cell use.
 *
 * Results:
 *    TRUE if the CellUse is unique within the parent CellDef, FALSE
 *    if there would be a name conflict.  If the cu_id of the CellUse
 *    is NULL, TRUE is always returned; FALSE is only returned if
 *    there is an existing name which would conflict with names already
 *    present in the CellUse.
 *
 * Side effects:
 *    Will set cu_id to an automatically generated instance id if
 *    it was originally NULL.
 *
 * ----------------------------------------------------------------------------
 */

bool
DBLinkCell(use, parentDef)
    CellUse *use;
    CellDef *parentDef;
{
    char useId[100], *lastName;
    HashEntry *he;
    int n;

    if (use->cu_id)
    {
      if (DBFindUse(use->cu_id, parentDef))
          return FALSE;
      DBSetUseIdHash(use, parentDef);
      return TRUE;
    }

    HashInit(&dbUniqueNameTable, 32, 0);  /* Indexed by use-id */

    /*
     * Uses can't contain slashes (otherwise they'd interfere with
     * terminal naming conventions).  If the cellName has a slash,
     * just use the part of it after the last slash.
     */
    lastName = rindex(use->cu_def->cd_name, '/');
    if (lastName == NULL) lastName = use->cu_def->cd_name;
    else lastName++;
    
    /* This search must not be interrupted */
    SigDisableInterrupts();
    (void) DBCellEnum(parentDef, dbLinkFunc, (ClientData) lastName);
    SigEnableInterrupts();

    /* This loop terminates only when an empty useid is found     */
    /* This loop should *not* terminate on interrupt, because     */
    /* lots of code relies on a NULL cu_id being passed to ensure */
    /* that the cell gets linked in.                        */

    for (n = 0;; n++)
    {
      (void) sprintf(useId, "%s_%d", lastName, n);
      he = HashLookOnly(&dbUniqueNameTable, useId);
      if (he == (HashEntry *) NULL)
      {
          HashKill(&dbUniqueNameTable);
          use->cu_id = StrDup((char **) NULL, useId);
          DBSetUseIdHash(use, parentDef);
          return (TRUE);
      }
    }

    /* Never gets here              */
    /* HashKill(&dbUniqueNameTable);      */
    /* return (FALSE);              */
}

/*
 * dbLinkFunc --
 *
 * Filter function called via DBCellEnum by DBLinkCell above.
 * Creates an entry in the hash table dbUniqueNameTable to
 * indicate that the name "defname_#" is not available.
 */

int
dbLinkFunc(cellUse, defname)
    CellUse *cellUse;
    char *defname;
{
    char *usep = cellUse->cu_id;

    /* Skip in the unlikely event that this cell has no use-id */
    if (usep == (char *) NULL)
      return (0);

    /*
     * Only add names whose initial part matches 'defname',
     * and which are of the form 'defname_something'.
     */
    while (*defname)
      if (*defname++ != *usep++)
          return 0;
    if (*usep++ != '_') return 0;
    if (*usep == '\0') return 0;

    /* Remember this name as being in use */
    (void) HashFind(&dbUniqueNameTable, cellUse->cu_id);

    return 0;
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBReLinkCell --
 *
 * Change the instance id of the supplied CellUse.
 * If the instance id is non-NULL, and the new id is the same
 * as the old one, we do nothing.
 *
 * Results:
 *    Returns TRUE if successful, FALSE if the new name was not
 *    unique within the parent def.
 *
 * Side effects:
 *    May modify the cu_id of the supplied CellUse.
 *    Marks the parent of the cell use as having been modified.
 * ----------------------------------------------------------------------------
 */

bool
DBReLinkCell(cellUse, newName)
    CellUse *cellUse;
    char *newName;
{
    if (cellUse->cu_id && strcmp(cellUse->cu_id, newName) == 0)
      return (TRUE);

    if (DBFindUse(newName, cellUse->cu_parent))
      return (FALSE);

    if (cellUse->cu_parent)
      cellUse->cu_parent->cd_flags |= CDMODIFIED;

    /* Old id (may be NULL) */
    if (cellUse->cu_id)
      DBUnLinkCell(cellUse, cellUse->cu_parent);
    if (UndoIsEnabled()) DBUndoCellUse(cellUse, UNDO_CELL_CLRID);

    /* New id */
    (void) StrDup(&cellUse->cu_id, newName);
    DBSetUseIdHash(cellUse, cellUse->cu_parent);
    if (UndoIsEnabled()) DBUndoCellUse(cellUse, UNDO_CELL_SETID);
    return (TRUE);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBFindUse --
 *
 * Find a CellUse with the given name in the supplied parent CellDef.
 *
 * Results:
 *    Returns a pointer to the found CellUse, or NULL if it was not
 *    found.
 *
 * Side effects:
 *    None.
 *
 * ----------------------------------------------------------------------------
 */

CellUse *
DBFindUse(id, parentDef)
    char *id;
    CellDef *parentDef;
{
    HashEntry *he;

    he = HashLookOnly(&parentDef->cd_idHash, id);
    if (he == NULL)
      return (CellUse *) NULL;

    return (CellUse *) HashGetValue(he);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBGenerateUniqueIds --
 *
 * Make certain that the use-id of each CellUse under 'def' is unique
 * if it exists.  If duplicates are detected, all but one is freed and
 * set to NULL.
 *
 * The second pass consists of giving each CellUse beneath 'def' with
 * a NULL use-id a uniquely generated one.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    May modify the use-id's of the cells in the cell plane of 'def'.
 *    Prints error messages if use-ids had to be reassigned.
 *
 * ----------------------------------------------------------------------------
 */

void
DBGenerateUniqueIds(def, warn)
    CellDef *def;
    bool warn;          /* If TRUE, warn user when we assign new ids */
{
    int dbFindNamesFunc();
    int dbGenerateUniqueIdsFunc();

    dbWarnUniqueIds = warn;
    HashInit(&dbUniqueDefTable, 32, 1);         /* Indexed by (CellDef *) */
    HashInit(&dbUniqueNameTable, 32, 0);  /* Indexed by use-id */

    /* Build up tables of names, complaining about duplicates */
    (void) DBCellEnum(def, dbFindNamesFunc, (ClientData) def);

    /* Assign unique use-ids to all cells */
    (void) DBCellEnum(def, dbGenerateUniqueIdsFunc, (ClientData) def);

    HashKill(&dbUniqueDefTable);
    HashKill(&dbUniqueNameTable);
}

/*
 * ----------------------------------------------------------------------------
 *
 * dbFindNamesFunc --
 *
 * Called via DBCellEnum() on behalf of DBGenerateUniqueIds() above,
 * for each subcell of the def just processed.  If any cell has a
 * use-id, we add it to our table of in-use names (dbUniqueNameTable).
 *
 * Results:
 *    Returns 0 always.
 *
 * Side effects:
 *    If the name already is in the table, free this cell's use-id
 *    and set it to NULL.  In any event, add the name to the table.
 *
 * ----------------------------------------------------------------------------
 */

int
dbFindNamesFunc(use, parentDef)
    CellUse *use;
    CellDef *parentDef;
{
    HashEntry *he;

    if (use->cu_id)
    {
      he = HashFind(&dbUniqueNameTable, use->cu_id);
      if (HashGetValue(he))
      {
          TxError("Duplicate instance-id for cell %s (%s) will be renamed\n",
                  use->cu_def->cd_name, use->cu_id);
          DBUnLinkCell(use, parentDef);
          freeMagic(use->cu_id);
          use->cu_id = (char *) NULL;
      }
      HashSetValue(he, use);
    }
    return (0);
}

/*
 * ----------------------------------------------------------------------------
 *
 * dbGenerateUniqueIdsFunc --
 *
 * Called via DBCellEnum() on behalf of DBGenerateUniqueIds() above,
 * for each subcell of the def just processed.  If the cell has no
 * use-id, we generate one automatically.  In any event, install the
 * use identifier for each cell processed in the HashTable
 * parentDef->cd_idHash.
 *
 * Algorithm:
 *    We generate unique use-id's of the form def_# where #
 *    is an integer such that no other use-id in this cell has
 *    the same name.  The HashTable dbUniqueDefTable is indexed
 *    by CellDef and contains the highest sequence number (#
 *    above) processed for that CellDef.  Each time we process
 *    a cell, we start with this sequence number and continue
 *    to increment it until we find a name that is not in
 *    calmaNamesTable, then generate the use-id, and store
 *    the next sequence number in the HashEntry for the CellDef.
 *
 * Results:
 *    Returns 0 always.
 *
 * Side effects:
 *    See above.
 *
 * ----------------------------------------------------------------------------
 */

int
dbGenerateUniqueIdsFunc(use, parentDef)
    CellUse *use;
    CellDef *parentDef;
{
    HashEntry *hedef, *hename;
    int suffix;
    char name[1024];

    if (use->cu_id)
      goto setHash;

    hedef = HashFind(&dbUniqueDefTable, (char *) use->cu_def);
    for (suffix = (spointertype) HashGetValue(hedef); ; suffix++)
    {
      (void) sprintf(name, "%s_%d", use->cu_def->cd_name, suffix);
      hename = HashLookOnly(&dbUniqueNameTable, name);
      if (hename == NULL)
          break;
    }

    if (dbWarnUniqueIds)
      TxPrintf("Setting instance-id of cell %s to %s\n",
            use->cu_def->cd_name, name);
    use->cu_id = StrDup((char **) NULL, name);
    HashSetValue(hedef, (spointertype)suffix + 1);

setHash:
    DBSetUseIdHash(use, parentDef);
    return (0);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBSetUseIdHash --
 *
 * Update the use-id hash table in parentDef to reflect the fact
 * that 'use' now has instance-id use->cu_id.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    See above.
 *
 * ----------------------------------------------------------------------------
 */

void
DBSetUseIdHash(use, parentDef)
    CellUse *use;
    CellDef *parentDef;
{
    HashEntry *he;

    he = HashFind(&parentDef->cd_idHash, use->cu_id);
    HashSetValue(he, (ClientData) use);
}

/*
 * ----------------------------------------------------------------------------
 *
 * DBUnLinkCell --
 *
 * Update the use-id hash table in parentDef to reflect the fact
 * that 'use' no longer is known by instance-id use->cu_id.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    See above.
 *
 * ----------------------------------------------------------------------------
 */

void
DBUnLinkCell(use, parentDef)
    CellUse *use;
    CellDef *parentDef;
{
    HashEntry *he;

    if (he = HashLookOnly(&parentDef->cd_idHash, use->cu_id))
      HashSetValue(he, (ClientData) NULL);
}


/*
 * ----------------------------------------------------------------------------
 *
 * DBNewYank --
 *
 * Create a new yank buffer with name 'yname'.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Fills in *pydef with a newly created CellDef by that name, and
 *    *pyuse with a newly created CellUse pointing to the new def.
 *    The CellDef pointed to by *pydef has the CD_INTERNAL flag
 *    set, and is marked as being available.
 *
 * ----------------------------------------------------------------------------
 */

void
DBNewYank(yname, pyuse, pydef)
    char *yname;  /* Name of yank buffer */
    CellUse **pyuse;    /* Pointer to new cell use is stored in *pyuse */
    CellDef **pydef;    /* Similarly for def */
{
    *pydef = DBCellLookDef(yname);
    if (*pydef == (CellDef *) NULL)
    {
      *pydef = DBCellNewDef (yname,(char *) NULL);
      ASSERT(*pydef != (CellDef *) NULL, "DBNewYank");
      DBCellSetAvail(*pydef);
      (*pydef)->cd_flags |= CDINTERNAL;
    }
    *pyuse = DBCellNewUse(*pydef, (char *) NULL);
    DBSetTrans(*pyuse, &GeoIdentityTransform);
    (*pyuse)->cu_expandMask = CU_DESCEND_SPECIAL; /* This is always expanded. */
}


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