summaryrefslogtreecommitdiffstats
path: root/tools/lib/h5diff.c
blob: 82c1a50f796cc5774692f2b6d5c90d5315ec2e72 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "H5private.h"
#include "h5tools.h"
#include "h5tools_utils.h"
#include "h5diff.h"
#include "ph5diff.h"


/*-------------------------------------------------------------------------
 * Function: print_objname
 *
 * Purpose:  check if object name is to be printed, only when:
 *             1) verbose mode
 *             2) when diff was found (normal mode)
 *-------------------------------------------------------------------------
 */
H5_ATTR_PURE int
print_objname (diff_opt_t * opts, hsize_t nfound)
{
    return ((opts->m_verbose || nfound) && !opts->m_quiet) ? 1 : 0;
}

/*-------------------------------------------------------------------------
 * Function: do_print_objname
 *
 * Purpose:  print object name
 *-------------------------------------------------------------------------
 */
void
do_print_objname (const char *OBJ, const char *path1, const char *path2, diff_opt_t * opts)
{
    /* if verbose level is higher than 0, put space line before
     * displaying any object or symbolic links. This improves
     * readability of the output.
     */
    if (opts->m_verbose_level >= 1)
        parallel_print("\n");
    parallel_print("%-7s: <%s> and <%s>\n", OBJ, path1, path2);
}

/*-------------------------------------------------------------------------
 * Function: do_print_attrname
 *
 * Purpose:  print attribute name
 *-------------------------------------------------------------------------
 */
void
do_print_attrname (const char *attr, const char *path1, const char *path2)
{
    parallel_print("%-7s: <%s> and <%s>\n", attr, path1, path2);
}

/*-------------------------------------------------------------------------
 * Function: print_warn
 *
 * Purpose:  check print warning condition.
 * Return:
 *           1 if verbose mode
 *           0 if not verbos mode
 *-------------------------------------------------------------------------
 */
static int
print_warn(diff_opt_t *opts)
{
    return ((opts->m_verbose)) ? 1: 0;
}


#ifdef H5_HAVE_PARALLEL
/*-------------------------------------------------------------------------
 * Function: phdiff_dismiss_workers
 *
 * Purpose:  tell all workers to end.
 *
 * Return:   none
 *-------------------------------------------------------------------------
 */
void
phdiff_dismiss_workers(void)
{
    int i;
    for (i = 1; i < g_nTasks; i++)
        MPI_Send(NULL, 0, MPI_BYTE, i, MPI_TAG_END, MPI_COMM_WORLD);
}


/*-------------------------------------------------------------------------
 * Function: print_incoming_data
 *
 * Purpose:  special function that prints any output that has been sent to the manager
 *           and is currently sitting in the incoming message queue
 *
 * Return:   none
 *-------------------------------------------------------------------------
 */

static void
print_incoming_data(void)
{
    char data[PRINT_DATA_MAX_SIZE + 1];
    int  incomingMessage;
    MPI_Status Status;

    do {
        MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_PRINT_DATA, MPI_COMM_WORLD, &incomingMessage, &Status);
        if(incomingMessage) {
            HDmemset(data, 0, PRINT_DATA_MAX_SIZE+1);
            MPI_Recv(data, PRINT_DATA_MAX_SIZE, MPI_CHAR, Status.MPI_SOURCE, MPI_TAG_PRINT_DATA, MPI_COMM_WORLD, &Status);

            HDprintf("%s", data);
        }
    } while(incomingMessage);
}
#endif

/*-------------------------------------------------------------------------
 * Function: is_valid_options
 *
 * Purpose:  check if options are valid
 *
 * Return:
 *           1 : Valid
 *           0 : Not valid
 *------------------------------------------------------------------------*/
static int
is_valid_options(diff_opt_t *opts)
{
    int ret_value = 1; /* init to valid */

    /*-----------------------------------------------
     * no -q(quiet) with -v (verbose) or -r (report) */
    if(opts->m_quiet && (opts->m_verbose || opts->m_report)) {
        parallel_print("Error: -q (quiet mode) cannot be added to verbose or report modes\n");
        opts->err_stat = H5DIFF_ERR;
        H5TOOLS_GOTO_DONE(0);
    }

    /* -------------------------------------------------------
     * only allow --no-dangling-links along with --follow-symlinks */
    if(opts->no_dangle_links && !opts->follow_links) {
        parallel_print("Error: --no-dangling-links must be used along with --follow-symlinks option.\n");
        opts->err_stat = H5DIFF_ERR;
        H5TOOLS_GOTO_DONE(0);
    }

done:
    return ret_value;
}

/*-------------------------------------------------------------------------
 * Function: is_exclude_path
 *
 * Purpose:  check if 'paths' are part of exclude path list
 *
 * Return:
 *           1 - excluded path
 *           0 - not excluded path
 *------------------------------------------------------------------------*/
static int
is_exclude_path (char * path, h5trav_type_t type, diff_opt_t *opts)
{
    struct exclude_path_list * exclude_path_ptr;
    int   ret_cmp;
    int   ret_value = 0;

    /* check if exclude path option is given */
    if (!opts->exclude_path)
        H5TOOLS_GOTO_DONE(0);

    /* assign to local exclude list pointer */
    exclude_path_ptr = opts->exclude;

    /* search objects in exclude list */
    while (NULL != exclude_path_ptr) {
        /* if exclude path is is group, exclude its members as well */
        if (exclude_path_ptr->obj_type == H5TRAV_TYPE_GROUP) {
            ret_cmp = HDstrncmp(exclude_path_ptr->obj_path, path,
                                HDstrlen(exclude_path_ptr->obj_path));
            if (ret_cmp == 0) {  /* found matching members */
                size_t len_grp;

                /* check if given path belong to an excluding group, if so
                 * exclude it as well.
                 * This verifies if “/grp1/dset1” is only under “/grp1”, but
                 * not under “/grp1xxx/” group.
                 */
                len_grp = HDstrlen(exclude_path_ptr->obj_path);
                if (path[len_grp] == '/') {
                    /* belong to excluded group! */
                    ret_value = 1;
                    break;  /* while */
                }
            }
        }
        /* exclude target is not group, just exclude the object */
        else {
            ret_cmp = HDstrcmp(exclude_path_ptr->obj_path, path);
            if (ret_cmp == 0) {  /* found matching object */
                /* excluded non-group object */
                ret_value = 1;
                /* remember the type of this maching object.
                 * if it's group, it can be used for excluding its member
                 * objects in this while() loop */
                exclude_path_ptr->obj_type = type;
                break; /* while */
            }
        }
        exclude_path_ptr = exclude_path_ptr->next;
    }

done:
    return  ret_value;
}


/*-------------------------------------------------------------------------
 * Function: free_exclude_path_list
 *
 * Purpose:  free exclude object list from diff options
 *------------------------------------------------------------------------*/
static void
free_exclude_path_list(diff_opt_t *opts)
{
    struct exclude_path_list *curr = opts->exclude;
    struct exclude_path_list *next;

    while (NULL != curr) {
        next = curr->next;
        HDfree(curr);
        curr = next;
    }
}

/*-------------------------------------------------------------------------
 * Function: build_match_list
 *
 * Purpose:  get list of matching path_name from info1 and info2
 *
 * Note:
 *           Find common objects; the algorithm used for this search is the
 *           cosequential match algorithm and is described in
 *           Folk, Michael; Zoellick, Bill. (1992). File Structures. Addison-Wesley.
 *           Moved out from diff_match() to make code more flexible.
 *
 * Parameter:
 *           table_out [OUT] : return the list
 *------------------------------------------------------------------------*/
static void
build_match_list (const char *objname1, trav_info_t *info1, const char *objname2, trav_info_t *info2,
        trav_table_t ** table_out, diff_opt_t *opts)
{
    size_t   curr1 = 0;
    size_t   curr2 = 0;
    unsigned infile[2];
    char    *path1_lp = NULL;
    char    *path2_lp = NULL;
    h5trav_type_t type1_l;
    h5trav_type_t type2_l;
    size_t   path1_offset = 0;
    size_t   path2_offset = 0;
    int      cmp;
    trav_table_t *table = NULL;
    size_t   idx;

    H5TOOLS_DEBUG("build_match_list start - errstat:%d", opts->err_stat);
    /* init */
    trav_table_init(&table);
    if (table == NULL) {
        H5TOOLS_INFO("Cannot create traverse table");
        H5TOOLS_GOTO_DONE_NO_RET();
    }

    /*
     * This is necessary for the case that given objects are group and
     * have different names (ex: obj1 is /grp1 and obj2 is /grp5).
     * All the objects belong to given groups are the candidates.
     * So prepare to compare paths without the group names.
     */

    /* if obj1 is not root */
    if (HDstrcmp (objname1,"/") != 0)
        path1_offset = HDstrlen(objname1);
    /* if obj2 is not root */
    if (HDstrcmp (objname2,"/") != 0)
        path2_offset = HDstrlen(objname2);

    /*--------------------------------------------------
    * build the list
    */
    while(curr1 < info1->nused && curr2 < info2->nused) {
        path1_lp = (info1->paths[curr1].path) + path1_offset;
        path2_lp = (info2->paths[curr2].path) + path2_offset;
        type1_l = info1->paths[curr1].type;
        type2_l = info2->paths[curr2].type;

        /* criteria is string compare */
        cmp = HDstrcmp(path1_lp, path2_lp);
        if(cmp == 0) {
            if(!is_exclude_path(path1_lp, type1_l, opts)) {
                infile[0] = 1;
                infile[1] = 1;
                trav_table_addflags(infile, path1_lp, info1->paths[curr1].type, table);
                /* if the two point to the same target object,
                 * mark that in table */
                if (info1->paths[curr1].fileno == info2->paths[curr2].fileno &&
                    info1->paths[curr1].objno == info2->paths[curr2].objno) {
                    idx = table->nobjs - 1;
                    table->objs[idx].is_same_trgobj = 1;
                }
            }
            curr1++;
            curr2++;
        } /* end if */
        else if(cmp < 0) {
            if(!is_exclude_path(path1_lp, type1_l, opts)) {
                infile[0] = 1;
                infile[1] = 0;
                trav_table_addflags(infile, path1_lp, info1->paths[curr1].type, table);
            }
            curr1++;
        } /* end else-if */
        else {
            if (!is_exclude_path(path2_lp, type2_l, opts)) {
                infile[0] = 0;
                infile[1] = 1;
                trav_table_addflags(infile, path2_lp, info2->paths[curr2].type, table);
            }
            curr2++;
        } /* end else */
    } /* end while */

    /* list1 did not end */
    infile[0] = 1;
    infile[1] = 0;
    while(curr1 < info1->nused) {
        path1_lp = (info1->paths[curr1].path) + path1_offset;
        type1_l = info1->paths[curr1].type;

        if(!is_exclude_path(path1_lp, type1_l, opts)) {
            trav_table_addflags(infile, path1_lp, info1->paths[curr1].type, table);
        }
        curr1++;
    } /* end while */

    /* list2 did not end */
    infile[0] = 0;
    infile[1] = 1;
    while(curr2 < info2->nused) {
        path2_lp = (info2->paths[curr2].path) + path2_offset;
        type2_l = info2->paths[curr2].type;

        if (!is_exclude_path(path2_lp, type2_l, opts)) {
            trav_table_addflags(infile, path2_lp, info2->paths[curr2].type, table);
        }
        curr2++;
    } /* end while */

    free_exclude_path_list (opts);

done:
    *table_out = table;

    H5TOOLS_ENDDEBUG("exit");
}


/*-------------------------------------------------------------------------
 * Function: trav_grp_objs
 *
 * Purpose:  Call back function from h5trav_visit().
 *------------------------------------------------------------------------*/
static herr_t
trav_grp_objs(const char *path, const H5O_info_t *oinfo,
        const char *already_visited, void *udata)
{
    trav_info_visit_obj(path, oinfo, already_visited, udata);

    return 0;
}

/*-------------------------------------------------------------------------
 * Function: trav_grp_symlinks
 *
 * Purpose:  Call back function from h5trav_visit().
 *           Track and extra checkings while visiting all symbolic-links.
 *------------------------------------------------------------------------*/
static herr_t
trav_grp_symlinks(const char *path, const H5L_info_t *linfo, void *udata)
{
    trav_info_t   *tinfo = (trav_info_t *)udata;
    diff_opt_t    *opts = (diff_opt_t *)tinfo->opts;
    h5tool_link_info_t lnk_info;
    const char    *ext_fname;
    const char    *ext_path;
    herr_t         ret_value = SUCCEED;

    /* init linkinfo struct */
    HDmemset(&lnk_info, 0, sizeof(h5tool_link_info_t));

    if (!opts->follow_links) {
        trav_info_visit_lnk(path, linfo, tinfo);
        H5TOOLS_GOTO_DONE(SUCCEED);
    }

    switch(linfo->type) {
        case H5L_TYPE_SOFT:
            if((ret_value = H5tools_get_symlink_info(tinfo->fid, path, &lnk_info, opts->follow_links)) < 0) {
                H5TOOLS_GOTO_DONE(FAIL);
            }
            else if (ret_value == 0) {
                /* no dangling link option given and detect dangling link */
                tinfo->symlink_visited.dangle_link = TRUE;
                trav_info_visit_lnk(path, linfo, tinfo);
                if (opts->no_dangle_links)
                    opts->err_stat = H5DIFF_ERR; /* make dangling link is error */
                H5TOOLS_GOTO_DONE(SUCCEED);
            }

            /* check if already visit the target object */
            if(symlink_is_visited( &(tinfo->symlink_visited), linfo->type, NULL, lnk_info.trg_path))
                H5TOOLS_GOTO_DONE(SUCCEED);

            /* add this link as visited link */
            if(symlink_visit_add( &(tinfo->symlink_visited), linfo->type, NULL, lnk_info.trg_path) < 0)
                H5TOOLS_GOTO_DONE(SUCCEED);

            if(h5trav_visit(tinfo->fid, path, TRUE, TRUE,
                         trav_grp_objs,trav_grp_symlinks, tinfo, H5O_INFO_BASIC) < 0) {
                parallel_print("Error: Could not get file contents\n");
                opts->err_stat = H5DIFF_ERR;
                H5TOOLS_GOTO_ERROR(FAIL, "Error: Could not get file contents");
            }
            break;

        case H5L_TYPE_EXTERNAL:
            if ((ret_value = H5tools_get_symlink_info(tinfo->fid, path, &lnk_info, opts->follow_links)) < 0) {
                H5TOOLS_GOTO_DONE(FAIL);
            }
            else if (ret_value == 0) {
            /* no dangling link option given and detect dangling link */
                tinfo->symlink_visited.dangle_link = TRUE;
                trav_info_visit_lnk(path, linfo, tinfo);
                if (opts->no_dangle_links)
                    opts->err_stat = H5DIFF_ERR; /* make dangling link is error */
                H5TOOLS_GOTO_DONE(SUCCEED);
            }

            if(H5Lunpack_elink_val(lnk_info.trg_path, linfo->u.val_size, NULL, &ext_fname, &ext_path) < 0)
                H5TOOLS_GOTO_DONE(SUCCEED);

            /* check if already visit the target object */
            if(symlink_is_visited( &(tinfo->symlink_visited), linfo->type, ext_fname, ext_path))
                H5TOOLS_GOTO_DONE(SUCCEED);

            /* add this link as visited link */
            if(symlink_visit_add( &(tinfo->symlink_visited), linfo->type, ext_fname, ext_path) < 0)
                H5TOOLS_GOTO_DONE(SUCCEED);

            if(h5trav_visit(tinfo->fid, path, TRUE, TRUE,
                            trav_grp_objs,trav_grp_symlinks, tinfo, H5O_INFO_BASIC) < 0) {
                parallel_print("Error: Could not get file contents\n");
                opts->err_stat = H5DIFF_ERR;
                H5TOOLS_GOTO_ERROR(FAIL, "Error: Could not get file contents\n");
            }
            break;

        case H5L_TYPE_HARD:
        case H5L_TYPE_MAX:
        case H5L_TYPE_ERROR:
        default:
            parallel_print("Error: Invalid link type\n");
            opts->err_stat = H5DIFF_ERR;
            H5TOOLS_GOTO_ERROR(FAIL, "Error: Invalid link type");
            break;
    } /* end of switch */

done:
    if (lnk_info.trg_path)
        HDfree(lnk_info.trg_path);
    H5TOOLS_ENDDEBUG("exit");
    return ret_value;
}


/*-------------------------------------------------------------------------
 * Function: h5diff
 *
 * Purpose:  public function, can be called in an application program.
 *           return differences between 2 HDF5 files
 *
 * Return:   Number of differences found.
 *-------------------------------------------------------------------------
 */
hsize_t
h5diff(const char *fname1,
               const char *fname2,
               const char *objname1,
               const char *objname2,
               diff_opt_t *opts)
{
    hid_t         file1_id = -1;
    hid_t         file2_id = -1;
    char          filenames[2][MAX_FILENAME];
    hsize_t       nfound = 0;
    int           l_ret1 = -1;
    int           l_ret2 = -1;
    char         *obj1fullname = NULL;
    char         *obj2fullname = NULL;
    int           both_objs_grp = 0;
    /* init to group type */
    h5trav_type_t obj1type = H5TRAV_TYPE_GROUP;
    h5trav_type_t obj2type = H5TRAV_TYPE_GROUP;
    /* for single object */
    H5O_info_t    oinfo1, oinfo2; /* object info */
    trav_info_t  *info1_obj = NULL;
    trav_info_t  *info2_obj = NULL;
    /* for group object */
    trav_info_t  *info1_grp = NULL;
    trav_info_t  *info2_grp = NULL;
    /* local pointer */
    trav_info_t  *info1_lp = NULL;
    trav_info_t  *info2_lp = NULL;
    /* link info from specified object */
    H5L_info_t    src_linfo1;
    H5L_info_t    src_linfo2;
    /* link info from member object */
    h5tool_link_info_t trg_linfo1;
    h5tool_link_info_t trg_linfo2;
    /* list for common objects */
    trav_table_t *match_list = NULL;
    diff_err_t    ret_value = H5DIFF_NO_ERR;

    H5TOOLS_DEBUG("h5diff start");
    /* init filenames */
    HDmemset(filenames, 0, MAX_FILENAME * 2);
    /* init link info struct */
    HDmemset(&trg_linfo1, 0, sizeof(h5tool_link_info_t));
    HDmemset(&trg_linfo2, 0, sizeof(h5tool_link_info_t));

   /*-------------------------------------------------------------------------
    * check invalid combination of options
    *-----------------------------------------------------------------------*/
    if(!is_valid_options(opts))
        H5TOOLS_GOTO_DONE(0);

    opts->cmn_objs = 1; /* eliminate warning */
    opts->err_stat = H5DIFF_NO_ERR; /* initialize error status */

    /*-------------------------------------------------------------------------
    * open the files first; if they are not valid, no point in continuing
    *-------------------------------------------------------------------------
    */
    /* open file 1 */
    if((file1_id = h5tools_fopen(fname1, H5F_ACC_RDONLY, H5P_DEFAULT, NULL, NULL, (size_t)0)) < 0) {
        parallel_print("h5diff: <%s>: unable to open file\n", fname1);
        H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "<%s>: unable to open file\n", fname1);
    } /* end if */
    H5TOOLS_DEBUG("file1_id = %s", fname1);

    /* open file 2 */
    if((file2_id = h5tools_fopen(fname2, H5F_ACC_RDONLY, H5P_DEFAULT, NULL, NULL, (size_t)0)) < 0) {
        parallel_print("h5diff: <%s>: unable to open file\n", fname2);
        H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "<%s>: unable to open file\n", fname2);
    } /* end if */
    H5TOOLS_DEBUG("file2_id = %s", fname2);

    /*-------------------------------------------------------------------------
    * Initialize the info structs
    *-------------------------------------------------------------------------
    */
    trav_info_init(fname1, file1_id, &info1_obj);
    trav_info_init(fname2, file2_id, &info2_obj);

    H5TOOLS_DEBUG("trav_info_init initialized");
    /* if any object is specified */
    if (objname1) {
        /* make the given object1 fullpath, start with "/"  */
        if (HDstrncmp(objname1, "/", 1)) {
#ifdef H5_HAVE_ASPRINTF
            /* Use the asprintf() routine, since it does what we're trying to do below */
            if(HDasprintf(&obj1fullname, "/%s", objname1) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "name buffer allocation failed");
#else /* H5_HAVE_ASPRINTF */
            /* (malloc 2 more for "/" and end-of-line) */
            if ((obj1fullname = (char*)HDmalloc(HDstrlen(objname1) + 2)) == NULL)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "name buffer allocation failed");

            HDstrcpy(obj1fullname, "/");
            HDstrcat(obj1fullname, objname1);
#endif /* H5_HAVE_ASPRINTF */
        }
        else
            obj1fullname = HDstrdup(objname1);

        /* make the given object2 fullpath, start with "/" */
        if (HDstrncmp(objname2, "/", 1)) {
#ifdef H5_HAVE_ASPRINTF
            /* Use the asprintf() routine, since it does what we're trying to do below */
            if(HDasprintf(&obj2fullname, "/%s", objname2) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "name buffer allocation failed");
#else /* H5_HAVE_ASPRINTF */
            /* (malloc 2 more for "/" and end-of-line) */
            if ((obj2fullname = (char*)HDmalloc(HDstrlen(objname2) + 2)) == NULL)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "name buffer allocation failed");
            HDstrcpy(obj2fullname, "/");
            HDstrcat(obj2fullname, objname2);
#endif /* H5_HAVE_ASPRINTF */
        }
        else
            obj2fullname = HDstrdup(objname2);

        /*----------------------------------------------------------
         * check if obj1 is root, group, single object or symlink
         */
        H5TOOLS_DEBUG("h5diff check if obj1=%s is root, group, single object or symlink", obj1fullname);
        if(!HDstrcmp(obj1fullname, "/")) {
            obj1type = H5TRAV_TYPE_GROUP;
        }
        else {
            /* check if link itself exist */
            if(H5Lexists(file1_id, obj1fullname, H5P_DEFAULT) <= 0) {
                parallel_print ("Object <%s> could not be found in <%s>\n", obj1fullname, fname1);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Error: Object could not be found");
            }
            /* get info from link */
            if(H5Lget_info(file1_id, obj1fullname, &src_linfo1, H5P_DEFAULT) < 0) {
                parallel_print("Unable to get link info from <%s>\n", obj1fullname);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Lget_info failed");
            }

            info1_lp = info1_obj;

            /*
             * check the type of specified path for hard and symbolic links
             */
            if(src_linfo1.type == H5L_TYPE_HARD) {
                size_t idx;

                /* optional data pass */
                info1_obj->opts = (diff_opt_t*)opts;

                if(H5Oget_info_by_name2(file1_id, obj1fullname, &oinfo1, H5O_INFO_BASIC, H5P_DEFAULT) < 0) {
                    parallel_print("Error: Could not get file contents\n");
                    H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Error: Could not get file contents");
                }
                obj1type = (h5trav_type_t)oinfo1.type;
                trav_info_add(info1_obj, obj1fullname, obj1type);
                idx = info1_obj->nused - 1;
                info1_obj->paths[idx].objno = oinfo1.addr;
                info1_obj->paths[idx].fileno = oinfo1.fileno;
            }
            else if (src_linfo1.type == H5L_TYPE_SOFT) {
                obj1type = H5TRAV_TYPE_LINK;
                trav_info_add(info1_obj, obj1fullname, obj1type);
            }
            else if (src_linfo1.type == H5L_TYPE_EXTERNAL) {
                obj1type = H5TRAV_TYPE_UDLINK;
                trav_info_add(info1_obj, obj1fullname, obj1type);
            }
        }

        /*----------------------------------------------------------
         * check if obj2 is root, group, single object or symlink
         */
        H5TOOLS_DEBUG("h5diff check if obj2=%s is root, group, single object or symlink", obj2fullname);
        if(!HDstrcmp(obj2fullname, "/")) {
            obj2type = H5TRAV_TYPE_GROUP;
        }
        else {
            /* check if link itself exist */
            if(H5Lexists(file2_id, obj2fullname, H5P_DEFAULT) <= 0) {
                parallel_print ("Object <%s> could not be found in <%s>\n", obj2fullname, fname2);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Error: Object could not be found");
            }
            /* get info from link */
            if(H5Lget_info(file2_id, obj2fullname, &src_linfo2, H5P_DEFAULT) < 0) {
                parallel_print("Unable to get link info from <%s>\n", obj2fullname);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Lget_info failed");
            }

            info2_lp = info2_obj;

            /*
             * check the type of specified path for hard and symbolic links
             */
            if(src_linfo2.type == H5L_TYPE_HARD) {
                size_t idx;

                /* optional data pass */
                info2_obj->opts = (diff_opt_t*)opts;

                if(H5Oget_info_by_name2(file2_id, obj2fullname, &oinfo2, H5O_INFO_BASIC, H5P_DEFAULT) < 0) {
                    parallel_print("Error: Could not get file contents\n");
                    H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Error: Could not get file contents");
                }
                obj2type = (h5trav_type_t)oinfo2.type;
                trav_info_add(info2_obj, obj2fullname, obj2type);
                idx = info2_obj->nused - 1;
                info2_obj->paths[idx].objno = oinfo2.addr;
                info2_obj->paths[idx].fileno = oinfo2.fileno;
            }
            else if (src_linfo2.type == H5L_TYPE_SOFT) {
                obj2type = H5TRAV_TYPE_LINK;
                trav_info_add(info2_obj, obj2fullname, obj2type);
            }
            else if (src_linfo2.type == H5L_TYPE_EXTERNAL) {
                obj2type = H5TRAV_TYPE_UDLINK;
                trav_info_add(info2_obj, obj2fullname, obj2type);
            }
        }
    }
    /* if no object specified */
    else {
        H5TOOLS_DEBUG("h5diff no object specified");
        /* set root group */
        obj1fullname = (char*)HDstrdup("/");
        obj1type = H5TRAV_TYPE_GROUP;
        obj2fullname = (char*)HDstrdup("/");
        obj2type = H5TRAV_TYPE_GROUP;
    }

    H5TOOLS_DEBUG("get any symbolic links info - errstat:%d", opts->err_stat);
    /* get any symbolic links info */
    l_ret1 = H5tools_get_symlink_info(file1_id, obj1fullname, &trg_linfo1, opts->follow_links);
    l_ret2 = H5tools_get_symlink_info(file2_id, obj2fullname, &trg_linfo2, opts->follow_links);

    /*---------------------------------------------
     * check for following symlinks
     */
    if (opts->follow_links) {
        /* pass how to handle printing warning to linkinfo option */
        if(print_warn(opts))
            trg_linfo1.opt.msg_mode = trg_linfo2.opt.msg_mode = 1;

        /*-------------------------------
         * check symbolic link (object1)
         */
        H5TOOLS_DEBUG("h5diff check symbolic link (object1)");
        /* dangling link */
        if (l_ret1 == 0) {
            H5TOOLS_DEBUG("h5diff ... dangling link");
            if (opts->no_dangle_links) {
                /* treat dangling link as error */
                if(opts->m_verbose)
                    parallel_print("Warning: <%s> is a dangling link.\n", obj1fullname);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "treat dangling link as error");
            }
            else {
                if(opts->m_verbose)
                    parallel_print("obj1 <%s> is a dangling link.\n", obj1fullname);
                if (l_ret1 != 0 ||  l_ret2 != 0) {
                    nfound++;
                    print_found(nfound);
                    H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
                }
            }
        }
        else if(l_ret1 < 0) { /* fail */
            parallel_print ("Object <%s> could not be found in <%s>\n", obj1fullname, fname1);
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Object could not be found");
        }
        else if(l_ret1 != 2) { /* symbolic link */
            obj1type = (h5trav_type_t)trg_linfo1.trg_type;
            H5TOOLS_DEBUG("h5diff ... ... trg_linfo1.trg_type == H5L_TYPE_HARD");
            if (info1_lp != NULL) {
                size_t idx = info1_lp->nused - 1;

                H5TOOLS_DEBUG("h5diff ... ... ... info1_obj not null");
                info1_lp->paths[idx].type = (h5trav_type_t)trg_linfo1.trg_type;
                info1_lp->paths[idx].objno = trg_linfo1.objno;
                info1_lp->paths[idx].fileno = trg_linfo1.fileno;
            }
            H5TOOLS_DEBUG("h5diff check symbolic link (object1) finished");
        }

        /*-------------------------------
         * check symbolic link (object2)
         */
        H5TOOLS_DEBUG("h5diff check symbolic link (object2)");
        /* dangling link */
        if (l_ret2 == 0) {
            H5TOOLS_DEBUG("h5diff ... dangling link");
            if (opts->no_dangle_links) {
                /* treat dangling link as error */
                if(opts->m_verbose)
                    parallel_print("Warning: <%s> is a dangling link.\n", obj2fullname);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "treat dangling link as error");
            }
            else {
                if(opts->m_verbose)
                    parallel_print("obj2 <%s> is a dangling link.\n", obj2fullname);
                if (l_ret1 != 0 || l_ret2 != 0) {
                    nfound++;
                    print_found(nfound);
                    H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
                }
            }
        }
        else if(l_ret2 < 0) { /* fail */
            parallel_print ("Object <%s> could not be found in <%s>\n", obj2fullname, fname2);
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Object could not be found");
        }
        else if(l_ret2 != 2) {  /* symbolic link */
            obj2type = (h5trav_type_t)trg_linfo2.trg_type;
            if (info2_lp != NULL) {
                size_t idx = info2_lp->nused - 1;

                H5TOOLS_DEBUG("h5diff ... ... ... info2_obj not null");
                info2_lp->paths[idx].type = (h5trav_type_t)trg_linfo2.trg_type;
                info2_lp->paths[idx].objno = trg_linfo2.objno;
                info2_lp->paths[idx].fileno = trg_linfo2.fileno;
            }
            H5TOOLS_DEBUG("h5diff check symbolic link (object1) finished");
        }
    } /* end of if follow symlinks */

   /*
    * If verbose options is not used, don't need to traverse through the list
    * of objects in the group to display objects information,
    * So use h5tools_is_obj_same() to improve performance by skipping
    * comparing details of same objects.
    */

    if(!(opts->m_verbose || opts->m_report)) {
        H5TOOLS_DEBUG("h5diff NOT (opts->m_verbose || opts->m_report)");
        /* if no danglink links */
        if (l_ret1 > 0 && l_ret2 > 0)
            if (h5tools_is_obj_same(file1_id, obj1fullname, file2_id, obj2fullname) != 0)
                H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
    }

    both_objs_grp = (obj1type == H5TRAV_TYPE_GROUP && obj2type == H5TRAV_TYPE_GROUP);
    if (both_objs_grp) {
        H5TOOLS_DEBUG("h5diff both_objs_grp TRUE");
        /*
         * traverse group1
         */
        trav_info_init(fname1, file1_id, &info1_grp);
        /* optional data pass */
        info1_grp->opts = (diff_opt_t*)opts;

        if(h5trav_visit(file1_id, obj1fullname, TRUE, TRUE,
                        trav_grp_objs, trav_grp_symlinks, info1_grp, H5O_INFO_BASIC) < 0) {
            parallel_print("Error: Could not get file contents\n");
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Could not get file contents");
        }
        info1_lp = info1_grp;

        /*
         * traverse group2
         */
        trav_info_init(fname2, file2_id, &info2_grp);
        /* optional data pass */
        info2_grp->opts = (diff_opt_t*)opts;

        if(h5trav_visit(file2_id, obj2fullname, TRUE, TRUE,
                        trav_grp_objs, trav_grp_symlinks, info2_grp, H5O_INFO_BASIC) < 0) {
            parallel_print("Error: Could not get file contents\n");
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "Could not get file contents");
       } /* end if */
        info2_lp = info2_grp;
    }
    H5TOOLS_DEBUG("groups traversed - errstat:%d", opts->err_stat);

#ifdef H5_HAVE_PARALLEL
    if(g_Parallel) {
        int i;

        if((HDstrlen(fname1) > MAX_FILENAME) || (HDstrlen(fname2) > MAX_FILENAME)) {
            HDfprintf(stderr, "The parallel diff only supports path names up to %d characters\n", MAX_FILENAME);
            MPI_Abort(MPI_COMM_WORLD, 0);
        } /* end if */

        HDstrcpy(filenames[0], fname1);
        HDstrcpy(filenames[1], fname2);

        /* Alert the worker tasks that there's going to be work. */
        for(i = 1; i < g_nTasks; i++)
            MPI_Send(filenames, (MAX_FILENAME * 2), MPI_CHAR, i, MPI_TAG_PARALLEL, MPI_COMM_WORLD);
    } /* end if */
#endif

    H5TOOLS_DEBUG("build_match_list next - errstat:%d", opts->err_stat);
    /* process the objects */
    build_match_list (obj1fullname, info1_lp, obj2fullname, info2_lp, &match_list, opts);
    H5TOOLS_DEBUG("build_match_list finished - errstat:%d", opts->err_stat);
    if (both_objs_grp) {
        /*------------------------------------------------------
         * print the list
         */
         if(opts->m_verbose) {
             unsigned u;

             parallel_print("\n");
             /* if given objects is group under root */
             if (HDstrcmp (obj1fullname,"/") || HDstrcmp (obj2fullname,"/"))
                 parallel_print("group1   group2\n");
             else
                 parallel_print("file1     file2\n");
             parallel_print("---------------------------------------\n");
             for(u = 0; u < match_list->nobjs; u++) {
                 char c1, c2;
                 c1 = (match_list->objs[u].flags[0]) ? 'x' : ' ';
                 c2 = (match_list->objs[u].flags[1]) ? 'x' : ' ';
                 parallel_print("%5c %6c    %-15s\n", c1, c2, match_list->objs[u].name);
             } /* end for */
             parallel_print ("\n");
         } /* end if */
    }
    H5TOOLS_DEBUG("diff_match next - errstat:%d", opts->err_stat);
    nfound = diff_match(file1_id, obj1fullname, info1_lp,
                        file2_id, obj2fullname, info2_lp,
                        match_list, opts);

done:
    opts->err_stat = opts->err_stat | ret_value;

#ifdef H5_HAVE_PARALLEL
    if(g_Parallel)
        /* All done at this point, let tasks know that they won't be needed */
        phdiff_dismiss_workers();
#endif
    /* free buffers in trav_info structures */
    if (info1_obj)
        trav_info_free(info1_obj);
    if (info2_obj)
        trav_info_free(info2_obj);

    if (info1_grp)
        trav_info_free(info1_grp);
    if (info2_grp)
        trav_info_free(info2_grp);

    /* free buffers */
    if (obj1fullname)
        HDfree(obj1fullname);
    if (obj2fullname)
        HDfree(obj2fullname);

    /* free link info buffer */
    if (trg_linfo1.trg_path)
        HDfree(trg_linfo1.trg_path);
    if (trg_linfo2.trg_path)
        HDfree(trg_linfo2.trg_path);

    /* close */
    H5E_BEGIN_TRY
    {
        H5Fclose(file1_id);
        H5Fclose(file2_id);
    } H5E_END_TRY;

    H5TOOLS_DEBUG("h5diff finish - errstat:%d", opts->err_stat);

    H5TOOLS_ENDDEBUG("exit");
    return nfound;
}



/*-------------------------------------------------------------------------
 * Function: diff_match
 *
 * Purpose:  Compare common objects in given groups according to table structure.
 *           The table structure has flags which can be used to find common objects
 *           and will be compared.
 *           Common object means same name (absolute path) objects in both location.
 *
 * Return:   Number of differences found
 *
 * Modifications: Compare the graph and make h5diff return 1 for difference if
 *           1) the number of objects in file1 is not the same as in file2
 *           2) the graph does not match, i.e same names (absolute path)
 *           3) objects with the same name are not of the same type
 *-------------------------------------------------------------------------
 */
hsize_t
diff_match(hid_t file1_id, const char *grp1, trav_info_t *info1,
                   hid_t file2_id, const char *grp2, trav_info_t *info2,
                   trav_table_t *table, diff_opt_t *opts)
{
    hsize_t      nfound = 0;
    unsigned     i;
    const char  *grp1_path = "";
    const char  *grp2_path = "";
    char        *obj1_fullpath = NULL;
    char        *obj2_fullpath = NULL;
    diff_args_t  argdata;
    size_t       idx1 = 0;
    size_t       idx2 = 0;
    diff_err_t   ret_value = opts->err_stat;

    H5TOOLS_DEBUG("diff_match start - errstat:%d", opts->err_stat);
    /*
     * if not root, prepare object name to be pre-appended to group path to
     * make full path
     */
    if(HDstrcmp(grp1, "/"))
        grp1_path = grp1;
    if(HDstrcmp(grp2, "/"))
        grp2_path = grp2;

    /*-------------------------------------------------------------------------
     * regarding the return value of h5diff (0, no difference in files, 1 difference )
     * 1) the number of objects in file1 must be the same as in file2
     * 2) the graph must match, i.e same names (absolute path)
     * 3) objects with the same name must be of the same type
     *-------------------------------------------------------------------------
     */

    /* not valid compare used when --exclude-path option is used */
    if (!opts->exclude_path) {
        /* number of different objects */
        if (info1->nused != info2->nused) {
            opts->contents = 0;
        }
    }

    /* objects in one file and not the other */
    for(i = 0; i < table->nobjs; i++) {
        if(table->objs[i].flags[0] != table->objs[i].flags[1]) {
            opts->contents = 0;
            break;
        }
    }

    /*-------------------------------------------------------------------------
     * do the diff for common objects
     *-------------------------------------------------------------------------
     */
#ifdef H5_HAVE_PARALLEL
    {
        char *workerTasks = (char*)HDmalloc((g_nTasks - 1) * sizeof(char));
        int   n;
        int   busyTasks = 0;
        struct diffs_found nFoundbyWorker;
        struct diff_mpi_args args;
        int   havePrintToken = 1;
        MPI_Status Status;

        /*set all tasks as free */
        HDmemset(workerTasks, 1, (g_nTasks - 1));
#endif

    for(i = 0; i < table->nobjs; i++) {
        H5TOOLS_DEBUG("diff for common objects[%d] - errstat:%d", i, opts->err_stat);
        if(table->objs[i].flags[0] && table->objs[i].flags[1]) {
            /* make full path for obj1 */
#ifdef H5_HAVE_ASPRINTF
            /* Use the asprintf() routine, since it does what we're trying to do below */
            if(HDasprintf(&obj1_fullpath, "%s%s", grp1_path, table->objs[i].name) < 0) {
                H5TOOLS_ERROR(H5DIFF_ERR, "name buffer allocation failed");
            }
#else /* H5_HAVE_ASPRINTF */
            if((obj1_fullpath = (char*)HDmalloc(HDstrlen(grp1_path) + HDstrlen(table->objs[i].name) + 1)) == NULL) {
                H5TOOLS_ERROR(H5DIFF_ERR, "name buffer allocation failed");
            }
            else {
                HDstrcpy(obj1_fullpath, grp1_path);
                HDstrcat(obj1_fullpath, table->objs[i].name);
            }
#endif /* H5_HAVE_ASPRINTF */
            H5TOOLS_DEBUG("diff_match path1 - %s", obj1_fullpath);

            /* make full path for obj2 */
#ifdef H5_HAVE_ASPRINTF
            /* Use the asprintf() routine, since it does what we're trying to do below */
            if(HDasprintf(&obj2_fullpath, "%s%s", grp2_path, table->objs[i].name) < 0) {
                H5TOOLS_ERROR(H5DIFF_ERR, "name buffer allocation failed");
            }
#else /* H5_HAVE_ASPRINTF */
            if((obj2_fullpath = (char*)HDmalloc(HDstrlen(grp2_path) + HDstrlen(table->objs[i].name) + 1)) == NULL) {
                H5TOOLS_ERROR(H5DIFF_ERR, "name buffer allocation failed");
            }
            else {
                HDstrcpy(obj2_fullpath, grp2_path);
                HDstrcat(obj2_fullpath, table->objs[i].name);
            }
#endif /* H5_HAVE_ASPRINTF */
            H5TOOLS_DEBUG("diff_match path2 - %s", obj2_fullpath);

            /* get index to figure out type of the object in file1 */
            while(info1->paths[idx1].path && (HDstrcmp(obj1_fullpath, info1->paths[idx1].path) != 0))
                idx1++;
            /* get index to figure out type of the object in file2 */
            while(info2->paths[idx2].path && (HDstrcmp(obj2_fullpath, info2->paths[idx2].path) != 0))
                idx2++;

            /* Set argdata to pass other args into diff() */
            argdata.type[0] = info1->paths[idx1].type;
            argdata.type[1] = info2->paths[idx2].type;
            argdata.is_same_trgobj = table->objs[i].is_same_trgobj;

            opts->cmn_objs = 1;
            if(!g_Parallel) {
                H5TOOLS_DEBUG("diff paths - errstat:%d", opts->err_stat);
                nfound += diff(file1_id, obj1_fullpath,
                               file2_id, obj2_fullpath,
                            opts, &argdata);
            } /* end if */
#ifdef H5_HAVE_PARALLEL
            else {
                int workerFound = 0;

                H5TOOLS_DEBUG("Beginning of big else block");
                /* We're in parallel mode */
                /* Since the data type of diff value is hsize_t which can
                * be arbitary large such that there is no MPI type that
                * matches it, the value is passed between processes as
                * an array of bytes in order to be portable.  But this
                * may not work in non-homogeneous MPI environments.
                */

                /*Set up args to pass to worker task. */
                if(HDstrlen(obj1_fullpath) > 255 ||
                   HDstrlen(obj2_fullpath) > 255) {
                    HDprintf("The parallel diff only supports object names up to 255 characters\n");
                    MPI_Abort(MPI_COMM_WORLD, 0);
                } /* end if */

                /* set args struct to pass */
                HDstrcpy(args.name1, obj1_fullpath);
                HDstrcpy(args.name2, obj2_fullpath);
                args.opts = *opts;
                args.argdata.type[0] = info1->paths[idx1].type;
                args.argdata.type[1] = info2->paths[idx2].type;
                args.argdata.is_same_trgobj = table->objs[i].is_same_trgobj;

                /* if there are any outstanding print requests, let's handle one. */
                if(busyTasks > 0) {
                    int incomingMessage;

                    /* check if any tasks freed up, and didn't need to print. */
                    MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_DONE, MPI_COMM_WORLD, &incomingMessage, &Status);

                    /* first block*/
                    if(incomingMessage) {
                        workerTasks[Status.MPI_SOURCE - 1] = 1;
                        MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_DONE, MPI_COMM_WORLD, &Status);
                        nfound += nFoundbyWorker.nfound;
                        opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                        busyTasks--;
                    } /* end if */

                    /* check to see if the print token was returned. */
                    if(!havePrintToken) {
                        /* If we don't have the token, someone is probably sending us output */
                        print_incoming_data();

                        /* check incoming queue for token */
                        MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &incomingMessage, &Status);

                        /* incoming token implies free task. */
                        if(incomingMessage) {
                            workerTasks[Status.MPI_SOURCE - 1] = 1;
                            MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                            nfound += nFoundbyWorker.nfound;
                            opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                            busyTasks--;
                            havePrintToken = 1;
                        } /* end if */
                    } /* end if */

                    /* check to see if anyone needs the print token. */
                    if(havePrintToken) {
                        /* check incoming queue for print token requests */
                        MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_REQUEST, MPI_COMM_WORLD, &incomingMessage, &Status);
                        if(incomingMessage) {
                            MPI_Recv(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_REQUEST, MPI_COMM_WORLD, &Status);
                            MPI_Send(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_PRINT_TOK, MPI_COMM_WORLD);
                            havePrintToken = 0;
                        } /* end if */
                    } /* end if */
                } /* end if */

                /* check array of tasks to see which ones are free.
                * Manager task never does work, so freeTasks[0] is really
                * worker task 0. */
                for(n = 1; (n < g_nTasks) && !workerFound; n++) {
                    if(workerTasks[n-1]) {
                        /* send file id's and names to first free worker */
                        MPI_Send(&args, sizeof(args), MPI_BYTE, n, MPI_TAG_ARGS, MPI_COMM_WORLD);

                        /* increment counter for total number of prints. */
                        busyTasks++;

                        /* mark worker as busy */
                        workerTasks[n - 1] = 0;
                        workerFound = 1;
                    } /* end if */
                } /* end for */

                if(!workerFound) {
                    /* if they were all busy, we've got to wait for one free up
                     *  before we can move on.  If we don't have the token, some
                     * task is currently printing so we'll wait for that task to
                     * return it.
                     */

                    if(!havePrintToken) {
                        while(!havePrintToken) {
                            int incomingMessage;

                            print_incoming_data();
                            MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &incomingMessage, &Status);
                            if(incomingMessage) {
                                MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                                havePrintToken = 1;
                                nfound += nFoundbyWorker.nfound;
                                opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                                /* send this task the work unit. */
                                MPI_Send(&args, sizeof(args), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_ARGS, MPI_COMM_WORLD);
                            } /* end if */
                        } /* end while */
                    } /* end if */
                    /* if we do have the token, check for task to free up, or wait for a task to request it */
                    else {
                        /* But first print all the data in our incoming queue */
                        print_incoming_data();
                        MPI_Probe(MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &Status);
                        if(Status.MPI_TAG == MPI_TAG_DONE) {
                            MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_DONE, MPI_COMM_WORLD, &Status);
                            nfound += nFoundbyWorker.nfound;
                            opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                            MPI_Send(&args, sizeof(args), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_ARGS, MPI_COMM_WORLD);
                        } /* end if */
                        else if(Status.MPI_TAG == MPI_TAG_TOK_REQUEST) {
                            int incomingMessage;

                            MPI_Recv(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_REQUEST, MPI_COMM_WORLD, &Status);
                            MPI_Send(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_PRINT_TOK, MPI_COMM_WORLD);

                            do {
                                MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &incomingMessage, &Status);

                                print_incoming_data();
                            } while(!incomingMessage);

                            MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                            nfound += nFoundbyWorker.nfound;
                            opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                            MPI_Send(&args, sizeof(args), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_ARGS, MPI_COMM_WORLD);
                        } /* end else-if */
                        else {
                            HDprintf("ERROR: Invalid tag (%d) received \n", Status.MPI_TAG);
                            MPI_Abort(MPI_COMM_WORLD, 0);
                            MPI_Finalize();
                        } /* end else */
                    } /* end else */
                } /* end if */
            } /* end else */
#endif /* H5_HAVE_PARALLEL */
            if(obj1_fullpath)
                HDfree(obj1_fullpath);
            if(obj2_fullpath)
                HDfree(obj2_fullpath);
        } /* end if */
    } /* end for */
    H5TOOLS_DEBUG("done with for loop - errstat:%d", opts->err_stat);

#ifdef H5_HAVE_PARALLEL
    if(g_Parallel) {
        /* make sure all tasks are done */
        while(busyTasks > 0) {
            MPI_Probe(MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &Status);
            if(Status.MPI_TAG == MPI_TAG_DONE) {
                MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_DONE, MPI_COMM_WORLD, &Status);
                nfound += nFoundbyWorker.nfound;
                opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                busyTasks--;
            } /* end if */
            else if(Status.MPI_TAG == MPI_TAG_TOK_REQUEST) {
                MPI_Recv(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_REQUEST, MPI_COMM_WORLD, &Status);
                if(havePrintToken) {
                    int incomingMessage;

                    MPI_Send(NULL, 0, MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_PRINT_TOK, MPI_COMM_WORLD);

                    do {
                        MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &incomingMessage, &Status);

                        print_incoming_data();
                    } while(!incomingMessage);

                    MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                    nfound += nFoundbyWorker.nfound;
                    opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                    busyTasks--;
                } /* end if */
                /* someone else must have it...wait for them to return it, then give it to the task that just asked for it. */
                else {
                    int source = Status.MPI_SOURCE;
                    int incomingMessage;

                    do {
                        MPI_Iprobe(MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &incomingMessage, &Status);

                        print_incoming_data();
                    } while(!incomingMessage);


                    MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, MPI_ANY_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                    nfound += nFoundbyWorker.nfound;
                    opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                    busyTasks--;
                    MPI_Send(NULL, 0, MPI_BYTE, source, MPI_TAG_PRINT_TOK, MPI_COMM_WORLD);
                } /* end else */
            } /* end else-if */
            else if(Status.MPI_TAG == MPI_TAG_TOK_RETURN) {
                MPI_Recv(&nFoundbyWorker, sizeof(nFoundbyWorker), MPI_BYTE, Status.MPI_SOURCE, MPI_TAG_TOK_RETURN, MPI_COMM_WORLD, &Status);
                nfound += nFoundbyWorker.nfound;
                opts->not_cmp = opts->not_cmp | nFoundbyWorker.not_cmp;
                busyTasks--;
                havePrintToken = 1;
            } /* end else-if */
            else if(Status.MPI_TAG == MPI_TAG_PRINT_DATA) {
                char  data[PRINT_DATA_MAX_SIZE + 1];
                HDmemset(data, 0, PRINT_DATA_MAX_SIZE + 1);

                MPI_Recv(data, PRINT_DATA_MAX_SIZE, MPI_CHAR, Status.MPI_SOURCE, MPI_TAG_PRINT_DATA, MPI_COMM_WORLD, &Status);

                HDprintf("%s", data);
            } /* end else-if */
            else {
                HDprintf("ph5diff-manager: ERROR!! Invalid tag (%d) received \n", Status.MPI_TAG);
                MPI_Abort(MPI_COMM_WORLD, 0);
            } /* end else */
        } /* end while */

        for(i = 1; i < g_nTasks; i++)
            MPI_Send(NULL, 0, MPI_BYTE, i, MPI_TAG_END, MPI_COMM_WORLD);

        /* Print any final data waiting in our queue */
        print_incoming_data();
    } /* end if */
    H5TOOLS_DEBUG("done with if block");

    HDfree(workerTasks);
    }
#endif /* H5_HAVE_PARALLEL */

    opts->err_stat = opts->err_stat | ret_value;

    /* free table */
    if (table)
        trav_table_free(table);

    H5TOOLS_DEBUG("diff_match finish diffs=%d - errstat:%d", nfound, opts->err_stat);

    H5TOOLS_ENDDEBUG("exit");
    return nfound;
}


/*-------------------------------------------------------------------------
 * Function: diff
 *
 * Purpose:  switch between types and choose the diff function
 *           TYPE is either
 *               H5G_GROUP         Object is a group
 *               H5G_DATASET       Object is a dataset
 *               H5G_TYPE          Object is a named data type
 *               H5G_LINK          Object is a symbolic link
 *
 * Return:   Number of differences found
 *-------------------------------------------------------------------------
 */
hsize_t
diff(hid_t file1_id,
              const char *path1,
              hid_t file2_id,
              const char *path2,
              diff_opt_t * opts,
              diff_args_t *argdata)
{
    int           status = -1;
    hid_t         dset1_id = H5I_INVALID_HID;
    hid_t         dset2_id = H5I_INVALID_HID;
    hid_t         type1_id = H5I_INVALID_HID;
    hid_t         type2_id = H5I_INVALID_HID;
    hid_t         grp1_id = H5I_INVALID_HID;
    hid_t         grp2_id = H5I_INVALID_HID;
    hbool_t       is_dangle_link1 = FALSE;
    hbool_t       is_dangle_link2 = FALSE;
    hbool_t       is_hard_link = FALSE;
    hsize_t       nfound = 0;
    h5trav_type_t object_type;
    diff_err_t    ret_value = opts->err_stat;

    /* to get link info */
    h5tool_link_info_t linkinfo1;
    h5tool_link_info_t linkinfo2;

    H5TOOLS_DEBUG("diff start - errstat:%d", opts->err_stat);

    /*init link info struct */
    HDmemset(&linkinfo1, 0, sizeof(h5tool_link_info_t));
    HDmemset(&linkinfo2, 0, sizeof(h5tool_link_info_t));

    /* pass how to handle printing warnings to linkinfo option */
    if(print_warn(opts))
        linkinfo1.opt.msg_mode = linkinfo2.opt.msg_mode = 1;

    /* for symbolic links, take care follow symlink and no dangling link
     * options */
    if (argdata->type[0] == H5TRAV_TYPE_LINK ||
        argdata->type[0] == H5TRAV_TYPE_UDLINK ||
        argdata->type[1] == H5TRAV_TYPE_LINK ||
        argdata->type[1] == H5TRAV_TYPE_UDLINK) {
        /*
         * check dangling links for path1 and path2
         */

        H5TOOLS_DEBUG("diff links");
        /* target object1 - get type and name */
        if ((status = H5tools_get_symlink_info(file1_id, path1, &linkinfo1, opts->follow_links)) < 0)
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5tools_get_symlink_info failed");

        /* dangling link */
        if (status == 0) {
            if (opts->no_dangle_links) {
                /* dangling link is error */
                if(opts->m_verbose)
                    parallel_print("Warning: <%s> is a dangling link.\n", path1);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "dangling link is error");
            }
            else
                is_dangle_link1 = TRUE;
        }

        /* target object2 - get type and name */
        if ((status = H5tools_get_symlink_info(file2_id, path2, &linkinfo2, opts->follow_links)) < 0)
            H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5tools_get_symlink_info failed");
        /* dangling link */
        if (status == 0) {
            if (opts->no_dangle_links) {
                /* dangling link is error */
                if(opts->m_verbose)
                    parallel_print("Warning: <%s> is a dangling link.\n", path2);
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "dangling link is error");
            }
            else
                is_dangle_link2 = TRUE;
        }

        /* found dangling link */
        if (is_dangle_link1 || is_dangle_link2) {
            H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
        }

        /* follow symbolic link option */
        if (opts->follow_links) {
            if (linkinfo1.linfo.type == H5L_TYPE_SOFT ||
                    linkinfo1.linfo.type == H5L_TYPE_EXTERNAL)
                argdata->type[0] = (h5trav_type_t)linkinfo1.trg_type;

            if (linkinfo2.linfo.type == H5L_TYPE_SOFT || linkinfo2.linfo.type == H5L_TYPE_EXTERNAL)
                argdata->type[1] = (h5trav_type_t)linkinfo2.trg_type;
        }
    }
    /* if objects are not the same type */
    if (argdata->type[0] != argdata->type[1]) {
        H5TOOLS_DEBUG("diff objects are not the same");
        if (opts->m_verbose||opts->m_list_not_cmp) {
            parallel_print("Not comparable: <%s> is of type %s and <%s> is of type %s\n",
            path1, get_type(argdata->type[0]),
            path2, get_type(argdata->type[1]));
        }
        opts->not_cmp = 1;
        /* TODO: will need to update non-comparable is different
         * opts->contents = 0;
         */
        H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
    }
    else /* now both object types are same */
        object_type = argdata->type[0];

    /*
     * If both points to the same target object, skip comparing details inside
     * of the objects to improve performance.
     * Always check for the hard links, otherwise if follow symlink option is
     * specified.
     *
     * Perform this to match the outputs as bypassing.
     */
     if (argdata->is_same_trgobj) {
        H5TOOLS_DEBUG("argdata->is_same_trgobj");
        is_hard_link = (object_type == H5TRAV_TYPE_DATASET ||
                        object_type == H5TRAV_TYPE_NAMED_DATATYPE ||
                        object_type == H5TRAV_TYPE_GROUP);
        if (opts->follow_links || is_hard_link) {
            /* print information is only verbose option is used */
            if(opts->m_verbose || opts->m_report) {
                switch(object_type) {
                    case H5TRAV_TYPE_DATASET:
                        do_print_objname("dataset", path1, path2, opts);
                        break;
                    case H5TRAV_TYPE_NAMED_DATATYPE:
                        do_print_objname("datatype", path1, path2, opts);
                        break;
                    case H5TRAV_TYPE_GROUP:
                        do_print_objname("group", path1, path2, opts);
                        break;
                    case H5TRAV_TYPE_LINK:
                        do_print_objname("link", path1, path2, opts);
                        break;
                    case H5TRAV_TYPE_UDLINK:
                        if(linkinfo1.linfo.type == H5L_TYPE_EXTERNAL && linkinfo2.linfo.type == H5L_TYPE_EXTERNAL)
                            do_print_objname("external link", path1, path2, opts);
                        else
                            do_print_objname ("user defined link", path1, path2, opts);
                        break;
                    case H5TRAV_TYPE_UNKNOWN:
                    default:
                        parallel_print("Comparison not supported: <%s> and <%s> are of type %s\n",
                            path1, path2, get_type(object_type) );
                        opts->not_cmp = 1;
                        break;
                } /* switch(type)*/

                print_found(nfound);
            } /* if(opts->m_verbose || opts->m_report) */

            /* exact same, so comparison is done */
            H5TOOLS_GOTO_DONE(H5DIFF_NO_ERR);
        }
    }

    switch(object_type) {
       /*----------------------------------------------------------------------
        * H5TRAV_TYPE_DATASET
        *----------------------------------------------------------------------
        */
        case H5TRAV_TYPE_DATASET:
            H5TOOLS_DEBUG("diff object type H5TRAV_TYPE_DATASET - errstat:%d", opts->err_stat);
            if((dset1_id = H5Dopen2(file1_id, path1, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Dopen2 failed");
            if((dset2_id = H5Dopen2(file2_id, path2, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Dopen2 failed");
            /* verbose (-v) and report (-r) mode */
            if(opts->m_verbose || opts->m_report) {
                do_print_objname("dataset", path1, path2, opts);
                H5TOOLS_DEBUG("call diff_dataset 1:%s  2:%s ", path1, path2);
                nfound = diff_dataset(file1_id, file2_id, path1, path2, opts);
                print_found(nfound);
            }
            /* quiet mode (-q), just count differences */
            else if(opts->m_quiet) {
                nfound = diff_dataset(file1_id, file2_id, path1, path2, opts);
            }
            /* the rest (-c, none, ...) */
            else {
                nfound = diff_dataset(file1_id, file2_id, path1, path2, opts);
                /* print info if difference found  */
                if (nfound) {
                    do_print_objname("dataset", path1, path2, opts);
                    print_found(nfound);
                }
            }
            H5TOOLS_DEBUG("diff after dataset:%d - errstat:%d", nfound, opts->err_stat);

            /*---------------------------------------------------------
             * compare attributes
             * if condition refers to cases when the dataset is a
             * referenced object
             *---------------------------------------------------------
             */
            if(path1) {
                H5TOOLS_DEBUG( "call diff_attr 1:%s  2:%s ", path1, path2);
                nfound += diff_attr(dset1_id, dset2_id, path1, path2, opts);
            }

            if(H5Dclose(dset1_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Dclose failed");
            if(H5Dclose(dset2_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Dclose failed");
            break;

       /*----------------------------------------------------------------------
        * H5TRAV_TYPE_NAMED_DATATYPE
        *----------------------------------------------------------------------
        */
        case H5TRAV_TYPE_NAMED_DATATYPE:
            H5TOOLS_DEBUG("H5TRAV_TYPE_NAMED_DATATYPE 1:%s  2:%s ", path1, path2);
            if((type1_id = H5Topen2(file1_id, path1, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Topen2 failed");
            if((type2_id = H5Topen2(file2_id, path2, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Topen2 failed");

            if((status = H5Tequal(type1_id, type2_id)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Tequal failed");

            /* if H5Tequal is > 0 then the datatypes refer to the same datatype */
            nfound = (status > 0) ? 0 : 1;

            if(print_objname(opts, nfound))
                do_print_objname("datatype", path1, path2, opts);

            /* always print the number of differences found in verbose mode */
            if(opts->m_verbose)
                print_found(nfound);

            /*-----------------------------------------------------------------
             * compare attributes
             * the if condition refers to cases when the dataset is a
             * referenced object
             *-----------------------------------------------------------------
             */
            if(path1) {
                H5TOOLS_DEBUG("call diff_attr 1:%s  2:%s ", path1, path2);
                nfound += diff_attr(type1_id, type2_id, path1, path2, opts);
            }

            if(H5Tclose(type1_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Tclose failed");
            if(H5Tclose(type2_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Tclose failed");
            break;

       /*----------------------------------------------------------------------
        * H5TRAV_TYPE_GROUP
        *----------------------------------------------------------------------
        */
        case H5TRAV_TYPE_GROUP:
            H5TOOLS_DEBUG("H5TRAV_TYPE_GROUP 1:%s  2:%s ", path1, path2);
            if(print_objname(opts, nfound))
                do_print_objname("group", path1, path2, opts);

            /* always print the number of differences found in verbose mode */
            if(opts->m_verbose)
                print_found(nfound);

            if((grp1_id = H5Gopen2(file1_id, path1, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Gclose failed");
            if((grp2_id = H5Gopen2(file2_id, path2, H5P_DEFAULT)) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Gclose failed");

            /*-----------------------------------------------------------------
             * compare attributes
             * the if condition refers to cases when the dataset is a
             * referenced object
             *-----------------------------------------------------------------
             */
            if(path1) {
                H5TOOLS_DEBUG("call diff_attr 1:%s  2:%s ", path1, path2);
                nfound += diff_attr(grp1_id, grp2_id, path1, path2, opts);
            }

            if(H5Gclose(grp1_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Gclose failed");
            if(H5Gclose(grp2_id) < 0)
                H5TOOLS_GOTO_ERROR(H5DIFF_ERR, "H5Gclose failed");
            break;


       /*----------------------------------------------------------------------
        * H5TRAV_TYPE_LINK
        *----------------------------------------------------------------------
        */
        case H5TRAV_TYPE_LINK:
            {
                H5TOOLS_DEBUG("H5TRAV_TYPE_LINK 1:%s  2:%s ", path1, path2);
                status = HDstrcmp(linkinfo1.trg_path, linkinfo2.trg_path);

                /* if the target link name is not same then the links are "different" */
                nfound = (status != 0) ? 1 : 0;

                if(print_objname(opts, nfound))
                    do_print_objname("link", path1, path2, opts);

                /* always print the number of differences found in verbose mode */
                if(opts->m_verbose)
                    print_found(nfound);
                }
            break;

       /*----------------------------------------------------------------------
        * H5TRAV_TYPE_UDLINK
        *----------------------------------------------------------------------
        */
        case H5TRAV_TYPE_UDLINK:
            {
                H5TOOLS_DEBUG("H5TRAV_TYPE_UDLINK 1:%s  2:%s ", path1, path2);
                /* Only external links will have a query function registered */
                if(linkinfo1.linfo.type == H5L_TYPE_EXTERNAL && linkinfo2.linfo.type == H5L_TYPE_EXTERNAL) {
                    /* If the buffers are the same size, compare them */
                    if(linkinfo1.linfo.u.val_size == linkinfo2.linfo.u.val_size) {
                        status = HDmemcmp(linkinfo1.trg_path, linkinfo2.trg_path, linkinfo1.linfo.u.val_size);
                    }
                    else
                        status = 1;

                    /* if "linkinfo1.trg_path" != "linkinfo2.trg_path" then the links
                     * are "different" extlinkinfo#.path is combination string of
                     * file_name and obj_name
                     */
                    nfound = (status != 0) ? 1 : 0;

                    if(print_objname(opts, nfound))
                        do_print_objname("external link", path1, path2, opts);

                } /* end if */
                else {
                    /* If one or both of these links isn't an external link, we can only
                     * compare information from H5Lget_info since we don't have a query
                     * function registered for them.
                     *
                     * If the link classes or the buffer length are not the
                     * same, the links are "different"
                     */
                    if((linkinfo1.linfo.type != linkinfo2.linfo.type) ||
                    (linkinfo1.linfo.u.val_size != linkinfo2.linfo.u.val_size))
                        nfound = 1;
                    else
                        nfound = 0;

                    if (print_objname (opts, nfound))
                        do_print_objname ("user defined link", path1, path2, opts);
                } /* end else */

                /* always print the number of differences found in verbose mode */
                if(opts->m_verbose)
                    print_found(nfound);
            }
            break;

        case H5TRAV_TYPE_UNKNOWN:
        default:
            if(opts->m_verbose)
                parallel_print("Comparison not supported: <%s> and <%s> are of type %s\n",
                    path1, path2, get_type(object_type) );
            opts->not_cmp = 1;
            break;
     }

done:
    opts->err_stat = opts->err_stat | ret_value;

    /*-----------------------------------
     * handle dangling link(s)
     */
    /* both path1 and path2 are dangling links */
    if(is_dangle_link1 && is_dangle_link2) {
        if(print_objname(opts, nfound)) {
            do_print_objname("dangling link", path1, path2, opts);
            print_found(nfound);
        }
    }
    /* path1 is dangling link */
    else if (is_dangle_link1) {
        if(opts->m_verbose)
           parallel_print("obj1 <%s> is a dangling link.\n", path1);
        nfound++;
        if(print_objname(opts, nfound))
            print_found(nfound);
    }
    /* path2 is dangling link */
    else if (is_dangle_link2) {
        if(opts->m_verbose)
            parallel_print("obj2 <%s> is a dangling link.\n", path2);
        nfound++;
        if(print_objname(opts, nfound))
            print_found(nfound);
    }

    /* free link info buffer */
    if (linkinfo1.trg_path)
        HDfree(linkinfo1.trg_path);
    if (linkinfo2.trg_path)
        HDfree(linkinfo2.trg_path);

    /* close */
    /* disable error reporting */
    H5E_BEGIN_TRY {
        H5Dclose(dset1_id);
        H5Dclose(dset2_id);
        H5Tclose(type1_id);
        H5Tclose(type2_id);
        H5Gclose(grp1_id);
        H5Gclose(grp2_id);
        /* enable error reporting */
    } H5E_END_TRY;

    H5TOOLS_DEBUG("diff finish:%d - errstat:%d", nfound, opts->err_stat);

    H5TOOLS_ENDDEBUG("exit");
    return nfound;
}