PathNode *p;
  while( path.pAll ){
    p = path.pAll;
    path.pAll = p->pAll;
    fossil_free(p);
  }
  bag_clear(&path.seen);
  path.pCurrent = 0;
  path.pAll = 0;
  memset(&path, 0, sizeof(&path));
  path.pEnd = 0;
  path.nStep = 0;
}

/*
** Construct the path from path.pStart to path.pEnd in the u.pTo fields.
*/
void path_reverse_path(void){
  PathNode *p;

  for(n=1, p=path.pStart; p; p=p->u.pTo, n++){
    char *z;
    z = db_text(0,
      "SELECT substr(uuid,1,12) || ' ' || datetime(mtime)"
      "  FROM blob, event"
      " WHERE blob.rid=%d AND event.objid=%d AND event.type='ci'",
      p->rid, p->rid);
    fossil_print("%4d: %s", n, z);
    fossil_print("%4d: %5d %s", n, p->rid, z);
    fossil_free(z);
    if( p->u.pTo ){
      fossil_print(" is a %s of\n", 
                   p->u.pTo->fromIsParent ? "parent" : "child");
    }else{
      fossil_print("\n");
    }

  for(n=1, p=path.pStart; p; p=p->u.pTo, n++){
    char *z;
    z = db_text(0,
      "SELECT substr(uuid,1,12) || ' ' || datetime(mtime)"
      "  FROM blob, event"
      " WHERE blob.rid=%d AND event.objid=%d AND event.type='ci'",
      p->rid, p->rid);
    fossil_print("%4d: %s", n, z);
    fossil_print("%4d: %5d %s", n, p->rid, z);
    fossil_free(z);
    if( p->rid==iFrom ) fossil_print(" VERSION1");
    if( p->rid==iTo ) fossil_print(" VERSION2");
    if( p->rid==iPivot ) fossil_print(" PIVOT");
    fossil_print("\n");
  }
}

/*
** Compute all file name changes that occur going from checkin iFrom
** to checkin iTo.
**
** The number of name changes is written into *pnChng.  For each name
** change, two integers are allocated for *piChng.  The first is the 
** filename.fnid for the original name and the second is for new name.
** filename.fnid for the original name as seen in check-in iFrom and
** the second is for new name as it is used in check-in iTo.
**
** Space to hold *piChng is obtained from fossil_malloc() and should
** be released by the caller.
**
** This routine really has nothing to do with pathion.  It is located
** This routine really has nothing to do with path.  It is located
** in this path.c module in order to leverage some of the path
** infrastructure.
*/
void find_filename_changes(
  int iFrom,
  int iTo,
  int *pnChng,
  int **aiChng
  int iFrom,               /* Ancestor check-in */
  int iTo,                 /* Recent check-in */
  int *pnChng,             /* Number of name changes along the path */
  int **aiChng,            /* Name changes */
  const char *zDebug       /* Generate trace output if no NULL */
){
  PathNode *p;           /* For looping over path from iFrom to iTo */
  PathNode *p;             /* For looping over path from iFrom to iTo */
  NameChange *pAll = 0;    /* List of all name changes seen so far */
  NameChange *pChng;       /* For looping through the name change list */
  int nChng = 0;           /* Number of files whose names have changed */
  int *aChng;              /* Two integers per name change */
  int i;                   /* Loop counter */
  Stmt q1;                 /* Query of name changes */

      if( p->fromIsParent ){
        fnid = db_column_int(&q1, 1);
        pfnid = db_column_int(&q1, 0);
      }else{
        fnid = db_column_int(&q1, 0);
        pfnid = db_column_int(&q1, 1);
      }
      if( zDebug ){
        fossil_print("%s at %d %.10z: %d[%z] -> %d[%z]\n",
           zDebug, p->rid, 
           db_text(0, "SELECT uuid FROM blob WHERE rid=%d", p->rid),
           pfnid,
           db_text(0, "SELECT name FROM filename WHERE fnid=%d", pfnid),
           fnid,
           db_text(0, "SELECT name FROM filename WHERE fnid=%d", fnid));
      }
      for(pChng=pAll; pChng; pChng=pChng->pNext){
        if( pChng->curName==pfnid ){
          pChng->newName = fnid;
          break;
        }
      }
      if( pChng==0 ){

  db_finalize(&q1);
  if( nChng ){
    *pnChng = nChng;
    aChng = *aiChng = fossil_malloc( nChng*2*sizeof(int) );
    for(pChng=pAll, i=0; pChng; pChng=pChng->pNext, i+=2){
      aChng[i] = pChng->origName;
      aChng[i+1] = pChng->newName;
      if( zDebug ){
        fossil_print("%s summary %d[%z] -> %d[%z]\n",
           zDebug,
           aChng[i],
           db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i]),
           aChng[i+1],
           db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i+1]));
      }
    }
    while( pAll ){
      pChng = pAll;
      pAll = pAll->pNext;
      fossil_free(pChng);
    }
  }

  int iFrom;
  int iTo;
  int *aChng;
  int nChng;
  int i;

  db_find_and_open_repository(0,0);
  if( g.argc!=4 ) usage("VERSION1 VERSION2");
  iFrom = name_to_rid(g.argv[2]);
  iTo = name_to_rid(g.argv[3]);
  find_filename_changes(iFrom, iTo, &nChng, &aChng);
  for(i=0; i<nChng; i++){
    char *zFrom, *zTo;
  if( g.argc<4 ) usage("VERSION1 VERSION2");
  while( g.argc>=4 ){
    iFrom = name_to_rid(g.argv[2]);
    iTo = name_to_rid(g.argv[3]);
    find_filename_changes(iFrom, iTo, &nChng, &aChng, 0);
    fossil_print("------ Changes for (%d) %s -> (%d) %s\n",
                 iFrom, g.argv[2], iTo, g.argv[3]);
    for(i=0; i<nChng; i++){
      char *zFrom, *zTo;

    zFrom = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2]);
    zTo = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2+1]);
    fossil_print("[%s] -> [%s]\n", zFrom, zTo);
    fossil_free(zFrom);
    fossil_free(zTo);
  }
  fossil_free(aChng);
}
      zFrom = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2]);
      zTo = db_text(0, "SELECT name FROM filename WHERE fnid=%d", aChng[i*2+1]);
      fossil_print("[%s] -> [%s]\n", zFrom, zTo);
      fossil_free(zFrom);
      fossil_free(zTo);
    }
    fossil_free(aChng);
    g.argv += 2;
    g.argc -= 2;
  }
}