summaryrefslogtreecommitdiffstats
path: root/src/H5A.c
blob: acd63072eac0b62e7fde30b14b30a784c58113a7 (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
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************/
/* Module Setup */
/****************/

#define H5A_PACKAGE		/*suppress error about including H5Apkg	*/
#define H5O_PACKAGE		/*suppress error about including H5Opkg	*/

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5A_init_interface


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Apkg.h"		/* Attributes				*/
#include "H5Opkg.h"		/* Object headers			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free Lists				*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Sprivate.h"		/* Dataspace functions			*/
#include "H5SMprivate.h"	/* Shared Object Header Messages	*/

/****************/
/* Local Macros */
/****************/

/* The number of reserved IDs in dataset ID group */
#define H5A_RESERVED_ATOMS  0


/******************/
/* Local Typedefs */
/******************/

/* Object header iterator callbacks */
/* Data structure for callback for locating the index by name */
typedef struct H5A_iter_cb1 {
    const char *name;
    int idx;
} H5A_iter_cb1;


/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/

static herr_t H5A_open_common(const H5G_loc_t *loc, H5A_t *attr);
static herr_t H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id);
static herr_t H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id);


/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/

/* Declare the free lists for H5A_t's */
H5FL_DEFINE(H5A_t);

/* Declare a free list to manage blocks of type conversion data */
H5FL_BLK_DEFINE(attr_buf);


/*-------------------------------------------------------------------------
 * Function:	H5A_init
 *
 * Purpose:	Initialize the interface from some other package.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, November 27, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5A_init(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5A_init, FAIL)
    /* FUNC_ENTER() does all the work */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_init() */


/*--------------------------------------------------------------------------
NAME
   H5A_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5A_init_interface()

RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.

--------------------------------------------------------------------------*/
static herr_t
H5A_init_interface(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5A_init_interface)

    /*
     * Create attribute ID type.
     */
    if(H5I_register_type(H5I_ATTR, (size_t)H5I_ATTRID_HASHSIZE, H5A_RESERVED_ATOMS, (H5I_free_t)H5A_close) < H5I_FILE)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "unable to initialize interface")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_init_interface() */


/*--------------------------------------------------------------------------
 NAME
    H5A_term_interface
 PURPOSE
    Terminate various H5A objects
 USAGE
    void H5A_term_interface()
 RETURNS
 DESCRIPTION
    Release any other resources allocated.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
     Can't report errors...
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
int
H5A_term_interface(void)
{
    int	n = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5A_term_interface)

    if(H5_interface_initialize_g) {
	if((n = H5I_nmembers(H5I_ATTR))>0) {
	    (void)H5I_clear_type(H5I_ATTR, FALSE);
	} else {
	    (void)H5I_dec_type_ref(H5I_ATTR);
	    H5_interface_initialize_g = 0;
	    n = 1;
	}
    }
    FUNC_LEAVE_NOAPI(n)
} /* H5A_term_interface() */


/*--------------------------------------------------------------------------
 NAME
    H5Acreate2
 PURPOSE
    Creates an attribute on an object
 USAGE
    hid_t H5Acreate2(loc_id, attr_name, type_id, space_id, acpl_id,
            aapl_id)
        hid_t loc_id;       IN: Object (dataset or group) to be attached to
        const char *attr_name;  IN: Name of attribute to locate and open
        hid_t type_id;          IN: ID of datatype for attribute
        hid_t space_id;         IN: ID of dataspace for attribute
        hid_t acpl_id;          IN: ID of creation property list (currently not used)
        hid_t aapl_id;          IN: Attribute access property list
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
        This function creates an attribute which is attached to the object
    specified with 'loc_id'.  The name specified with 'attr_name' for
    each attribute for an object must be unique for that object.  The 'type_id'
    and 'space_id' are created with the H5T and H5S interfaces respectively.
    The 'aapl_id' property list is currently unused, but will be used in the
    future for optional attribute access properties.  The attribute ID returned
    from this function must be released with H5Aclose or resource leaks will
    develop.

--------------------------------------------------------------------------*/
/* ARGSUSED */
hid_t
H5Acreate2(hid_t loc_id, const char *attr_name, hid_t type_id, hid_t space_id,
    hid_t acpl_id, hid_t UNUSED aapl_id)
{
    H5G_loc_t           loc;                    /* Object location */
    H5T_t		*type;                  /* Datatype to use for attribute */
    H5S_t		*space;                 /* Dataspace to use for attribute */
    hid_t		ret_value;              /* Return value */

    FUNC_ENTER_API(H5Acreate2, FAIL)
    H5TRACE6("i", "i*siiii", loc_id, attr_name, type_id, space_id,
             acpl_id, aapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(0 == (H5F_INTENT(loc.oloc->file) & H5F_ACC_RDWR))
	HGOTO_ERROR(H5E_ARGS, H5E_WRITEERROR, FAIL, "no write intent on file")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")
    if(NULL == (type = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a type")
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space")

    /* Go do the real work for attaching the attribute to the dataset */
    if((ret_value = H5A_create(&loc, attr_name, type, space, acpl_id, H5AC_dxpl_id)) < 0)
	HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to create attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Acreate2() */


/*--------------------------------------------------------------------------
 NAME
    H5Acreate_by_name
 PURPOSE
    Creates an attribute on an object
 USAGE
    hid_t H5Acreate_by_name(loc_id, obj_name, attr_name, type_id, space_id, acpl_id,
            aapl_id, lapl_id)
        hid_t loc_id;       IN: Object (dataset or group) to be attached to
        const char *obj_name;   IN: Name of object relative to location
        const char *attr_name;  IN: Name of attribute to locate and open
        hid_t type_id;          IN: ID of datatype for attribute
        hid_t space_id;         IN: ID of dataspace for attribute
        hid_t acpl_id;          IN: ID of creation property list (currently not used)
        hid_t aapl_id;          IN: Attribute access property list
        hid_t lapl_id;          IN: Link access property list
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
        This function creates an attribute which is attached to the object
    specified with 'loc_id/obj_name'.  The name specified with 'attr_name' for
    each attribute for an object must be unique for that object.  The 'type_id'
    and 'space_id' are created with the H5T and H5S interfaces respectively.
    The 'aapl_id' property list is currently unused, but will be used in the
    future for optional attribute access properties.  The attribute ID returned
    from this function must be released with H5Aclose or resource leaks will
    develop.

--------------------------------------------------------------------------*/
/* ARGSUSED */
hid_t
H5Acreate_by_name(hid_t loc_id, const char *obj_name, const char *attr_name,
    hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t UNUSED aapl_id,
    hid_t lapl_id)
{
    H5G_loc_t           loc;                    /* Object location */
    H5G_loc_t           obj_loc;                /* Location used to open group */
    H5G_name_t          obj_path;            	/* Opened object group hier. path */
    H5O_loc_t           obj_oloc;            	/* Opened object object location */
    hbool_t             loc_found = FALSE;      /* Entry at 'obj_name' found */
    H5T_t		*type;                  /* Datatype to use for attribute */
    H5S_t		*space;                 /* Dataspace to use for attribute */
    hid_t		ret_value;              /* Return value */

    FUNC_ENTER_API(H5Acreate_by_name, FAIL)
    H5TRACE8("i", "i*s*siiiii", loc_id, obj_name, attr_name, type_id, space_id,
             acpl_id, aapl_id, lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(0 == (H5F_INTENT(loc.oloc->file) & H5F_ACC_RDWR))
	HGOTO_ERROR(H5E_ARGS, H5E_WRITEERROR, FAIL, "no write intent on file")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")
    if(NULL == (type = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a type")
    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space")

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(&loc, obj_name, &obj_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "object not found")
    loc_found = TRUE;

    /* Go do the real work for attaching the attribute to the dataset */
    if((ret_value = H5A_create(&obj_loc, attr_name, type, space, acpl_id, H5AC_dxpl_id)) < 0)
	HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to create attribute")

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* H5Acreate_by_name() */


/*-------------------------------------------------------------------------
 * Function:	H5A_create
 *
 * Purpose:
 *      This is the guts of creating an attribute.
 * Usage:
 *  hid_t H5A_create (ent, name, type, space)
 *      const H5G_entry_t *ent;   IN: Pointer to symbol table entry for object to attribute
 *      const char *name;   IN: Name of attribute
 *      H5T_t *type;        IN: Datatype of attribute
 *      H5S_t *space;       IN: Dataspace of attribute
 *      hid_t acpl_id       IN: Attribute creation property list
 *
 * Return: Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		April 2, 1998
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5A_create(const H5G_loc_t *loc, const char *name, const H5T_t *type,
    const H5S_t *space, hid_t acpl_id, hid_t dxpl_id)
{
    H5A_t	    *attr = NULL;
    htri_t           tri_ret;           /* htri_t return value */
    hid_t	     ret_value;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5A_create)

    /* check args */
    HDassert(loc);
    HDassert(name);
    HDassert(type);
    HDassert(space);

    /* Check for existing attribute with same name */
    /* (technically, the "attribute create" operation will fail for a duplicated
     *  name, but it's going to be hard to unwind all the special cases on
     *  failure, so just check first, for now - QAK)
     */
    if((tri_ret = H5O_attr_exists(loc->oloc, name, H5AC_ind_dxpl_id)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "error checking attributes")
    else if(tri_ret > 0)
        HGOTO_ERROR(H5E_ATTR, H5E_ALREADYEXISTS, FAIL, "attribute already exists")

    /* Check if the dataspace has an extent set (or is NULL) */
    if(!(H5S_has_extent(space)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "dataspace extent has not been set")

    /* Build the attribute information */
    if((attr = H5FL_CALLOC(H5A_t)) == NULL)
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for attribute info")

    /* If the creation property list is H5P_DEFAULT, use the default character encoding */
    if(acpl_id == H5P_DEFAULT)
        attr->encoding = H5F_DEFAULT_CSET;
    else {
        H5P_genplist_t  *ac_plist;      /* ACPL Property list */

        /* Get a local copy of the attribute creation property list */
        if(NULL == (ac_plist = (H5P_genplist_t *)H5I_object(acpl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

        if(H5P_get(ac_plist, H5P_STRCRT_CHAR_ENCODING_NAME, &(attr->encoding)) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get character encoding flag")
    } /* end else */

    /* Copy the attribute name */
    attr->name = H5MM_xstrdup(name);

    /* Copy the attribute's datatype */
    attr->dt = H5T_copy(type, H5T_COPY_ALL);

    /* Mark any datatypes as being on disk now */
    if(H5T_set_loc(attr->dt, loc->oloc->file, H5T_LOC_DISK) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid datatype location")

    /* Set the latest format for datatype, if requested */
    if(H5F_USE_LATEST_FORMAT(loc->oloc->file))
        if(H5T_set_latest_version(attr->dt) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set latest version of datatype")

    /* Copy the dataspace for the attribute */
    attr->ds = H5S_copy(space, FALSE);

    /* Set the latest format for dataspace, if requested */
    if(H5F_USE_LATEST_FORMAT(loc->oloc->file))
        if(H5S_set_latest_version(attr->ds) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set latest version of dataspace")

    /* Mark it initially set to initialized */
    attr->initialized = TRUE; /*for now, set to false later*/

    /* Copy the object header information */
    if(H5O_loc_copy(&(attr->oloc), loc->oloc, H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to copy entry")

    /* Deep copy of the group hierarchy path */
    if(H5G_name_copy(&(attr->path), loc->path, H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to copy path")

    /* Check if any of the pieces should be (or are already) shared in the
     * SOHM table
     */
    if(H5SM_try_share(attr->oloc.file, dxpl_id, NULL, H5O_DTYPE_ID, attr->dt, NULL) < 0)
	HGOTO_ERROR(H5E_OHDR, H5E_BADMESG, FAIL, "trying to share datatype failed")
    if(H5SM_try_share(attr->oloc.file, dxpl_id, NULL, H5O_SDSPACE_ID, attr->ds, NULL) < 0)
	HGOTO_ERROR(H5E_OHDR, H5E_BADMESG, FAIL, "trying to share dataspace failed")

    /* Check whether datatype is committed & increment ref count
     * (to maintain ref. count incr/decr similarity with "shared message"
     *      type of datatype sharing)
     */
    if(H5T_committed(attr->dt)) {
        /* Increment the reference count on the shared datatype */
        if(H5T_link(attr->dt, 1, dxpl_id) < 0)
            HGOTO_ERROR(H5E_OHDR, H5E_LINKCOUNT, FAIL, "unable to adjust shared datatype link count")
    } /* end if */

    /* Compute the size of pieces on disk.  This is either the size of the
     * datatype and dataspace messages themselves, or the size of the "shared"
     * messages if either or both of them are shared.
     */
    attr->dt_size = H5O_msg_raw_size(attr->oloc.file, H5O_DTYPE_ID, FALSE, attr->dt);
    attr->ds_size = H5O_msg_raw_size(attr->oloc.file, H5O_SDSPACE_ID, FALSE, attr->ds);

    HDassert(attr->dt_size > 0);
    HDassert(attr->ds_size > 0);
    H5_ASSIGN_OVERFLOW(attr->data_size, H5S_GET_EXTENT_NPOINTS(attr->ds) * H5T_get_size(attr->dt), hssize_t, size_t);

    /* Hold the symbol table entry (and file) open */
    if(H5O_open(&(attr->oloc)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open")
    attr->obj_opened = TRUE;

    /* Set the version to encode the attribute with */
    if(H5A_set_version(attr->oloc.file, attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTSET, FAIL, "unable to update attribute version")

    /* Insert the attribute into the object header */
    if(H5O_attr_create(&(attr->oloc), dxpl_id, attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINSERT, FAIL, "unable to create attribute in object header")

    /* Register the new attribute and get an ID for it */
    if((ret_value = H5I_register(H5I_ATTR, attr)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID")

    /* Now it's safe to say it's uninitialized */
    attr->initialized = FALSE;

done:
    /* Cleanup on failure */
    if(ret_value < 0)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_create() */


/*--------------------------------------------------------------------------
 NAME
    H5Aopen
 PURPOSE
    Opens an attribute for an object by looking up the attribute name
 USAGE
    hid_t H5Aopen(loc_id, attr_name, aapl_id)
        hid_t loc_id;           IN: Object that attribute is attached to
        const char *attr_name;  IN: Name of attribute to locate and open
        hid_t aapl_id;          IN: Attribute access property list
 RETURNS
    ID of attribute on success, negative on failure

 DESCRIPTION
        This function opens an existing attribute for access.  The attribute
    name specified is used to look up the corresponding attribute for the
    object.  The attribute ID returned from this function must be released with
    H5Aclose or resource leaks will develop.
--------------------------------------------------------------------------*/
hid_t
H5Aopen(hid_t loc_id, const char *attr_name, hid_t UNUSED aapl_id)
{
    H5G_loc_t    	loc;            /* Object location */
    H5A_t               *attr = NULL;   /* Attribute opened */
    hid_t		ret_value;

    FUNC_ENTER_API(H5Aopen, FAIL)
    H5TRACE3("i", "i*si", loc_id, attr_name, aapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")

    /* Read in attribute from object header */
    if(NULL == (attr = H5O_attr_open_by_name(loc.oloc, attr_name, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to load attribute info from object header")
    attr->initialized = TRUE;

    /* Finish initializing attribute */
    if(H5A_open_common(&loc, attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to initialize attribute")

    /* Register the attribute and get an ID for it */
    if((ret_value = H5I_register(H5I_ATTR, attr)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID")

done:
    /* Cleanup on failure */
    if(ret_value < 0)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* H5Aopen() */


/*--------------------------------------------------------------------------
 NAME
    H5Aopen_by_name
 PURPOSE
    Opens an attribute for an object by looking up the attribute name
 USAGE
    hid_t H5Aopen_by_name(loc_id, obj_name, attr_name, aapl_id, lapl_id)
        hid_t loc_id;           IN: Object that attribute is attached to
        const char *obj_name;   IN: Name of object relative to location
        const char *attr_name;  IN: Name of attribute to locate and open
        hid_t aapl_id;          IN: Attribute access property list
        hid_t lapl_id;          IN: Link access property list
 RETURNS
    ID of attribute on success, negative on failure

 DESCRIPTION
        This function opens an existing attribute for access.  The attribute
    name specified is used to look up the corresponding attribute for the
    object.  The attribute ID returned from this function must be released with
    H5Aclose or resource leaks will develop.
--------------------------------------------------------------------------*/
hid_t
H5Aopen_by_name(hid_t loc_id, const char *obj_name, const char *attr_name,
    hid_t UNUSED aapl_id, hid_t lapl_id)
{
    H5G_loc_t    	loc;            /* Object location */
    H5A_t               *attr = NULL;   /* Attribute opened */
    hid_t		ret_value;

    FUNC_ENTER_API(H5Aopen_by_name, FAIL)
    H5TRACE5("i", "i*s*sii", loc_id, obj_name, attr_name, aapl_id, lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Open the attribute on the object header */
    if(NULL == (attr = H5A_open_by_name(&loc, obj_name, attr_name, lapl_id, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")

    /* Register the attribute and get an ID for it */
    if((ret_value = H5I_register(H5I_ATTR, attr)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID")

done:
    /* Cleanup on failure */
    if(ret_value < 0)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* H5Aopen_by_name() */


/*--------------------------------------------------------------------------
 NAME
    H5Aopen_by_idx
 PURPOSE
    Opens the n'th attribute for an object, according to the order within
    an index
 USAGE
    hid_t H5Aopen_by_idx(loc_id, obj_ame, idx_type, order, n, aapl_id, lapl_id)
        hid_t loc_id;           IN: Object that attribute is attached to
        const char *obj_name;   IN: Name of object relative to location
        H5_index_t idx_type;    IN: Type of index to use
        H5_iter_order_t order;  IN: Order to iterate over index
        hsize_t n;              IN: Index (0-based) attribute to open
        hid_t aapl_id;          IN: Attribute access property list
        hid_t lapl_id;          IN: Link access property list
 RETURNS
    ID of attribute on success, negative on failure

 DESCRIPTION
        This function opens an existing attribute for access.  The attribute
    index specified is used to look up the corresponding attribute for the
    object.  The attribute ID returned from this function must be released with
    H5Aclose or resource leaks will develop.
--------------------------------------------------------------------------*/
hid_t
H5Aopen_by_idx(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, hid_t UNUSED aapl_id, hid_t lapl_id)
{
    H5A_t       *attr = NULL;   /* Attribute opened */
    H5G_loc_t	loc;	        /* Object location */
    hid_t	ret_value;      /* Return value */

    FUNC_ENTER_API(H5Aopen_by_idx, FAIL)
    H5TRACE7("i", "i*sIiIohii", loc_id, obj_name, idx_type, order, n, aapl_id,
             lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Open the attribute in the object header */
    if(NULL == (attr = H5A_open_by_idx(&loc, obj_name, idx_type, order, n, lapl_id, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open attribute")

    /* Register the attribute and get an ID for it */
    if((ret_value = H5I_register(H5I_ATTR, attr)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register attribute for ID")

done:
    /* Cleanup on failure */
    if(ret_value < 0)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* H5Aopen_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5A_open_common
 *
 * Purpose:
 *      Finishes initializing an attributes the open
 *      
 * Usage:
 *  herr_t H5A_open_common(loc, name, dxpl_id)
 *      const H5G_loc_t *loc;   IN: Pointer to group location for object
 *      H5A_t *attr;            IN/OUT: Pointer to attribute to initialize
 *
 * Return: Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		December 18, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5A_open_common(const H5G_loc_t *loc, H5A_t *attr)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5A_open_common)

    /* check args */
    HDassert(loc);
    HDassert(attr);

#if defined(H5_USING_MEMCHECKER) || !defined(NDEBUG)
    /* Clear object location */
    if(H5O_loc_reset(&(attr->oloc)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to reset location")
#endif /* H5_USING_MEMCHECKER */

    /* Free any previous group hier. path */
    if(H5G_name_free(&(attr->path)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release group hier. path")

    /* Deep copy of the symbol table entry */
    if(H5O_loc_copy(&(attr->oloc), loc->oloc, H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to copy entry")

    /* Deep copy of the group hier. path */
    if(H5G_name_copy(&(attr->path), loc->path, H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to copy entry")

    /* Hold the symbol table entry (and file) open */
    if(H5O_open(&(attr->oloc)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open")
    attr->obj_opened = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_open_common() */


/*-------------------------------------------------------------------------
 * Function:	H5A_open_by_idx
 *
 * Purpose: 	Open an attribute according to its index order
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		April 2, 1998
 *
 *-------------------------------------------------------------------------
 */
H5A_t *
H5A_open_by_idx(const H5G_loc_t *loc, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, hid_t lapl_id, hid_t dxpl_id)
{
    H5G_loc_t   obj_loc;                /* Location used to open group */
    H5G_name_t  obj_path;            	/* Opened object group hier. path */
    H5O_loc_t   obj_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    H5A_t       *attr = NULL;           /* Attribute from object header */
    H5A_t       *ret_value;             /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5A_open_by_idx)

    /* check args */
    HDassert(loc);
    HDassert(obj_name);

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(loc, obj_name, &obj_loc/*out*/, lapl_id, dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, NULL, "object not found")
    loc_found = TRUE;

    /* Read in attribute from object header */
    if(NULL == (attr = H5O_attr_open_by_idx(obj_loc.oloc, idx_type, order, n, dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to load attribute info from object header")
    attr->initialized = TRUE;

    /* Finish initializing attribute */
    if(H5A_open_common(&obj_loc, attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to initialize attribute")

    /* Set return value */
    ret_value = attr;

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, NULL, "can't free location")

    /* Cleanup on failure */
    if(ret_value == NULL)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, NULL, "can't close attribute")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_open_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5A_open_by_name
 *
 * Purpose:	Open an attribute in an object header, according to it's name
 *      
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		December 11, 2006
 *
 *-------------------------------------------------------------------------
 */
H5A_t *
H5A_open_by_name(const H5G_loc_t *loc, const char *obj_name, const char *attr_name,
    hid_t lapl_id, hid_t dxpl_id)
{
    H5G_loc_t   obj_loc;                /* Location used to open group */
    H5G_name_t  obj_path;            	/* Opened object group hier. path */
    H5O_loc_t   obj_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    H5A_t       *attr = NULL;           /* Attribute from object header */
    H5A_t       *ret_value;             /* Return value */

    FUNC_ENTER_NOAPI(H5A_open_by_name, NULL)

    /* check args */
    HDassert(loc);
    HDassert(obj_name);
    HDassert(attr_name);

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(loc, obj_name, &obj_loc/*out*/, lapl_id, dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, NULL, "object not found")
    loc_found = TRUE;

    /* Read in attribute from object header */
    if(NULL == (attr = H5O_attr_open_by_name(obj_loc.oloc, attr_name, dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to load attribute info from object header")
    attr->initialized = TRUE;

    /* Finish initializing attribute */
    if(H5A_open_common(loc, attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to initialize attribute")

    /* Set return value */
    ret_value = attr;

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, NULL, "can't free location")

    /* Cleanup on failure */
    if(ret_value == NULL)
        if(attr && H5A_close(attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, NULL, "can't close attribute")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_open_by_name() */


/*--------------------------------------------------------------------------
 NAME
    H5Awrite
 PURPOSE
    Write out data to an attribute
 USAGE
    herr_t H5Awrite (attr_id, dtype_id, buf)
        hid_t attr_id;       IN: Attribute to write
        hid_t dtype_id;       IN: Memory datatype of buffer
        const void *buf;     IN: Buffer of data to write
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
        This function writes a complete attribute to disk.
--------------------------------------------------------------------------*/
herr_t
H5Awrite(hid_t attr_id, hid_t dtype_id, const void *buf)
{
    H5A_t	   *attr;               /* Attribute object for ID */
    const H5T_t    *mem_type = NULL;
    herr_t	    ret_value;

    FUNC_ENTER_API(H5Awrite, FAIL)
    H5TRACE3("e", "ii*x", attr_id, dtype_id, buf);

    /* check arguments */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
    if(NULL == buf)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "null attribute buffer")

    /* Go write the actual data to the attribute */
    if((ret_value = H5A_write(attr, mem_type, buf, H5AC_dxpl_id)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Awrite() */


/*--------------------------------------------------------------------------
 NAME
    H5A_write
 PURPOSE
    Actually write out data to an attribute
 USAGE
    herr_t H5A_write (attr, mem_type, buf)
        H5A_t *attr;         IN: Attribute to write
        const H5T_t *mem_type;     IN: Memory datatype of buffer
        const void *buf;           IN: Buffer of data to write
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
    This function writes a complete attribute to disk.
--------------------------------------------------------------------------*/
static herr_t
H5A_write(H5A_t *attr, const H5T_t *mem_type, const void *buf, hid_t dxpl_id)
{
    uint8_t		*tconv_buf = NULL;	/* datatype conv buffer */
    hbool_t             tconv_owned = FALSE;    /* Whether the datatype conv buffer is owned by attribute */
    uint8_t		*bkg_buf = NULL;	/* temp conversion buffer */
    hssize_t		snelmts;		/* elements in attribute */
    size_t		nelmts;		    	/* elements in attribute */
    H5T_path_t		*tpath = NULL;		/* conversion information*/
    hid_t		src_id = -1, dst_id = -1;/* temporary type atoms */
    size_t		src_type_size;		/* size of source type	*/
    size_t		dst_type_size;		/* size of destination type*/
    size_t		buf_size;		/* desired buffer size	*/
    herr_t		ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5A_write)

    HDassert(attr);
    HDassert(mem_type);
    HDassert(buf);

    /* Get # of elements for attribute's dataspace */
    if((snelmts = H5S_GET_EXTENT_NPOINTS(attr->ds)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTCOUNT, FAIL, "dataspace is invalid")
    H5_ASSIGN_OVERFLOW(nelmts, snelmts, hssize_t, size_t);

    /* If there's actually data elements for the attribute, make a copy of the data passed in */
    if(nelmts > 0) {
        /* Get the memory and file datatype sizes */
        src_type_size = H5T_get_size(mem_type);
        dst_type_size = H5T_get_size(attr->dt);

        /* Convert memory buffer into disk buffer */
        /* Set up type conversion function */
        if(NULL == (tpath = H5T_path_find(mem_type, attr->dt, NULL, NULL, dxpl_id, FALSE)))
            HGOTO_ERROR(H5E_ATTR, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dst datatypes")

        /* Check for type conversion required */
        if(!H5T_path_noop(tpath)) {
            if((src_id = H5I_register(H5I_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL))) < 0 ||
                    (dst_id = H5I_register(H5I_DATATYPE, H5T_copy(attr->dt, H5T_COPY_ALL))) < 0)
                HGOTO_ERROR(H5E_ATTR, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")

            /* Get the maximum buffer size needed and allocate it */
            buf_size = nelmts * MAX(src_type_size, dst_type_size);
            if(NULL == (tconv_buf = H5FL_BLK_MALLOC (attr_buf, buf_size)) || NULL == (bkg_buf = H5FL_BLK_CALLOC(attr_buf, buf_size)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

            /* Copy the user's data into the buffer for conversion */
            HDmemcpy(tconv_buf, buf, (src_type_size * nelmts));

            /* Perform datatype conversion */
            if(H5T_convert(tpath, src_id, dst_id, nelmts, (size_t)0, (size_t)0, tconv_buf, bkg_buf, dxpl_id) < 0)
                HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "datatype conversion failed")

            /* Free the previous attribute data buffer, if there is one */
            if(attr->data)
                attr->data = H5FL_BLK_FREE(attr_buf, attr->data);

            /* Set the pointer to the attribute data to the converted information */
            attr->data = tconv_buf;
            tconv_owned = TRUE;
        } /* end if */
        /* No type conversion necessary */
        else {
            HDassert(dst_type_size == src_type_size);

            /* Allocate the attribute buffer, if there isn't one */
            if(attr->data == NULL)
                if(NULL == (attr->data = H5FL_BLK_MALLOC(attr_buf, dst_type_size * nelmts)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

            /* Copy the attribute data into the user's buffer */
            HDmemcpy(attr->data, buf, (dst_type_size * nelmts));
        } /* end else */

        /* Modify the attribute in the object header */
        if(H5O_attr_write(&(attr->oloc), dxpl_id, attr) < 0)
            HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to modify attribute")
    } /* end if */

    /* Indicate the the attribute doesn't need fill-values */
    attr->initialized = TRUE;

done:
    /* Release resources */
    if(src_id >= 0)
        (void)H5I_dec_ref(src_id);
    if(dst_id >= 0)
        (void)H5I_dec_ref(dst_id);
    if(tconv_buf && !tconv_owned)
        H5FL_BLK_FREE(attr_buf, tconv_buf);
    if(bkg_buf)
        H5FL_BLK_FREE(attr_buf, bkg_buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_write() */


/*--------------------------------------------------------------------------
 NAME
    H5Aread
 PURPOSE
    Read in data from an attribute
 USAGE
    herr_t H5Aread (attr_id, dtype_id, buf)
        hid_t attr_id;       IN: Attribute to read
        hid_t dtype_id;       IN: Memory datatype of buffer
        void *buf;           IN: Buffer for data to read
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
        This function reads a complete attribute from disk.
--------------------------------------------------------------------------*/
herr_t
H5Aread(hid_t attr_id, hid_t dtype_id, void *buf)
{
    H5A_t		*attr;                  /* Attribute object for ID */
    const H5T_t    	*mem_type = NULL;
    herr_t		ret_value;

    FUNC_ENTER_API(H5Aread, FAIL)
    H5TRACE3("e", "ii*x", attr_id, dtype_id, buf);

    /* check arguments */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
    if(NULL == buf)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "null attribute buffer")

    /* Go write the actual data to the attribute */
    if((ret_value = H5A_read(attr, mem_type, buf, H5AC_dxpl_id)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_READERROR, FAIL, "unable to read attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Aread() */


/*--------------------------------------------------------------------------
 NAME
    H5A_read
 PURPOSE
    Actually read in data from an attribute
 USAGE
    herr_t H5A_read (attr, mem_type, buf)
        H5A_t *attr;         IN: Attribute to read
        const H5T_t *mem_type;     IN: Memory datatype of buffer
        void *buf;           IN: Buffer for data to read
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
    This function reads a complete attribute from disk.
--------------------------------------------------------------------------*/
static herr_t
H5A_read(const H5A_t *attr, const H5T_t *mem_type, void *buf, hid_t dxpl_id)
{
    uint8_t		*tconv_buf = NULL;	/* datatype conv buffer*/
    uint8_t		*bkg_buf = NULL;	/* background buffer */
    hssize_t		snelmts;		/* elements in attribute */
    size_t		nelmts;			/* elements in attribute*/
    H5T_path_t		*tpath = NULL;		/* type conversion info	*/
    hid_t		src_id = -1, dst_id = -1;/* temporary type atoms*/
    size_t		src_type_size;		/* size of source type 	*/
    size_t		dst_type_size;		/* size of destination type */
    size_t		buf_size;		/* desired buffer size	*/
    herr_t		ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5A_read)

    HDassert(attr);
    HDassert(mem_type);
    HDassert(buf);

    /* Create buffer for data to store on disk */
    if((snelmts = H5S_GET_EXTENT_NPOINTS(attr->ds)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTCOUNT, FAIL, "dataspace is invalid")
    H5_ASSIGN_OVERFLOW(nelmts, snelmts, hssize_t, size_t);

    if(nelmts > 0) {
        /* Get the memory and file datatype sizes */
        src_type_size = H5T_get_size(attr->dt);
        dst_type_size = H5T_get_size(mem_type);

        /* Check if the attribute has any data yet, if not, fill with zeroes */
        if(attr->obj_opened && !attr->initialized)
            HDmemset(buf, 0, (dst_type_size * nelmts));
        else {  /* Attribute exists and has a value */
            /* Convert memory buffer into disk buffer */
            /* Set up type conversion function */
            if(NULL == (tpath = H5T_path_find(attr->dt, mem_type, NULL, NULL, dxpl_id, FALSE)))
                HGOTO_ERROR(H5E_ATTR, H5E_UNSUPPORTED, FAIL, "unable to convert between src and dst datatypes")

            /* Check for type conversion required */
            if(!H5T_path_noop(tpath)) {
                if((src_id = H5I_register(H5I_DATATYPE, H5T_copy(attr->dt, H5T_COPY_ALL))) < 0 ||
                        (dst_id = H5I_register(H5I_DATATYPE, H5T_copy(mem_type, H5T_COPY_ALL))) < 0)
                    HGOTO_ERROR(H5E_ATTR, H5E_CANTREGISTER, FAIL, "unable to register types for conversion")

                /* Get the maximum buffer size needed and allocate it */
                buf_size = nelmts * MAX(src_type_size, dst_type_size);
                if(NULL == (tconv_buf = H5FL_BLK_MALLOC(attr_buf, buf_size)) || NULL == (bkg_buf = H5FL_BLK_CALLOC(attr_buf, buf_size)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

                /* Copy the attribute data into the buffer for conversion */
                HDmemcpy(tconv_buf, attr->data, (src_type_size * nelmts));

                /* Perform datatype conversion.  */
                if(H5T_convert(tpath, src_id, dst_id, nelmts, (size_t)0, (size_t)0, tconv_buf, bkg_buf, dxpl_id) < 0)
                    HGOTO_ERROR(H5E_ATTR, H5E_CANTENCODE, FAIL, "datatype conversion failed")

                /* Copy the converted data into the user's buffer */
                HDmemcpy(buf, tconv_buf, (dst_type_size * nelmts));
            } /* end if */
            /* No type conversion necessary */
            else {
                HDassert(dst_type_size == src_type_size);

                /* Copy the attribute data into the user's buffer */
                HDmemcpy(buf, attr->data, (dst_type_size * nelmts));
            } /* end else */
        } /* end else */
    } /* end if */

done:
    /* Release resources */
    if(src_id >= 0)
        (void)H5I_dec_ref(src_id);
    if(dst_id >= 0)
        (void)H5I_dec_ref(dst_id);
    if(tconv_buf)
        H5FL_BLK_FREE(attr_buf, tconv_buf);
    if(bkg_buf)
	H5FL_BLK_FREE(attr_buf, bkg_buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5A_read() */


/*--------------------------------------------------------------------------
 NAME
    H5Aget_space
 PURPOSE
    Gets a copy of the dataspace for an attribute
 USAGE
    hid_t H5Aget_space (attr_id)
        hid_t attr_id;       IN: Attribute to get dataspace of
 RETURNS
    A dataspace ID on success, negative on failure

 DESCRIPTION
        This function retrieves a copy of the dataspace for an attribute.
    The dataspace ID returned from this function must be released with H5Sclose
    or resource leaks will develop.
--------------------------------------------------------------------------*/
hid_t
H5Aget_space(hid_t attr_id)
{
    H5A_t	*attr;                  /* Attribute object for ID */
    H5S_t	*ds = NULL;             /* Copy of dataspace for attribute */
    hid_t	ret_value;

    FUNC_ENTER_API(H5Aget_space, FAIL)
    H5TRACE1("i", "i", attr_id);

    /* check arguments */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")

    /* Copy the attribute's dataspace */
    if(NULL == (ds = H5S_copy (attr->ds, FALSE)))
	HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to copy dataspace")

    /* Atomize */
    if((ret_value = H5I_register(H5I_DATASPACE, ds)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace atom")

done:
    if(ret_value < 0 && ds)
        (void)H5S_close(ds);

    FUNC_LEAVE_API(ret_value)
} /* H5Aget_space() */


/*--------------------------------------------------------------------------
 NAME
    H5Aget_type
 PURPOSE
    Gets a copy of the datatype for an attribute
 USAGE
    hid_t H5Aget_type (attr_id)
        hid_t attr_id;       IN: Attribute to get datatype of
 RETURNS
    A datatype ID on success, negative on failure

 DESCRIPTION
        This function retrieves a copy of the datatype for an attribute.
    The datatype ID returned from this function must be released with H5Tclose
    or resource leaks will develop.
--------------------------------------------------------------------------*/
hid_t
H5Aget_type(hid_t attr_id)
{
    H5A_t	*attr;          /* Attribute object for ID */
    H5T_t	*dt = NULL;     /* Copy of attribute's datatype */
    hid_t	 ret_value;

    FUNC_ENTER_API(H5Aget_type, FAIL)
    H5TRACE1("i", "i", attr_id);

    /* check arguments */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")

    /*
     * Copy the attribute's datatype.  If the type is a named type then
     * reopen the type before returning it to the user. Make the type
     * read-only.
     */
    if(NULL == (dt = H5T_copy(attr->dt, H5T_COPY_REOPEN)))
	HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, FAIL, "unable to copy datatype")

    /* Mark any datatypes as being in memory now */
    if(H5T_set_loc(dt, NULL, H5T_LOC_MEMORY) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "invalid datatype location")
    if(H5T_lock(dt, FALSE) < 0)
	HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to lock transient datatype")

    /* Atomize */
    if((ret_value = H5I_register(H5I_DATATYPE, dt)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register datatype atom")

done:
    if(ret_value < 0 && dt)
        (void)H5T_close(dt);

    FUNC_LEAVE_API(ret_value)
} /* H5Aget_type() */


/*--------------------------------------------------------------------------
 NAME
    H5Aget_create_plist
 PURPOSE
    Gets a copy of the creation property list for an attribute
 USAGE
    hssize_t H5Aget_create_plist (attr_id, buf_size, buf)
        hid_t attr_id;      IN: Attribute to get name of
 RETURNS
    This function returns the ID of a copy of the attribute's creation
    property list, or negative on failure.

 ERRORS

 DESCRIPTION
        This function returns a copy of the creation property list for
    an attribute.  The resulting ID must be closed with H5Pclose() or
    resource leaks will occur.
--------------------------------------------------------------------------*/
hid_t
H5Aget_create_plist(hid_t attr_id)
{
    H5A_t		*attr;               /* Attribute object for ID */
    H5P_genplist_t      *plist;              /* Default property list */
    hid_t               new_plist_id;        /* ID of ACPL to return */
    H5P_genplist_t      *new_plist;          /* ACPL to return */
    hid_t		ret_value;

    FUNC_ENTER_API(H5Aget_create_plist, FAIL)
    H5TRACE1("i", "i", attr_id);

    HDassert(H5P_LST_ATTRIBUTE_CREATE_g != -1);

    /* Get attribute and default attribute creation property list*/
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
    if(NULL == (plist = (H5P_genplist_t *)H5I_object(H5P_LST_ATTRIBUTE_CREATE_g)))
        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "can't get default ACPL")

    /* Create the property list object to return */
    if((new_plist_id = H5P_copy_plist(plist)) < 0)
	HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to copy attribute creation properties")
    if(NULL == (new_plist = (H5P_genplist_t *)H5I_object(new_plist_id)))
        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "can't get property list")

    /* Set the character encoding on the new property list */
    if(H5P_set(new_plist, H5P_STRCRT_CHAR_ENCODING_NAME, &(attr->encoding)) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set character encoding")

    ret_value = new_plist_id;

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_create_plist() */


/*--------------------------------------------------------------------------
 NAME
    H5Aget_name
 PURPOSE
    Gets a copy of the name for an attribute
 USAGE
    hssize_t H5Aget_name (attr_id, buf_size, buf)
        hid_t attr_id;      IN: Attribute to get name of
        size_t buf_size;    IN: The size of the buffer to store the string in.
        char *buf;          IN: Buffer to store name in
 RETURNS
    This function returns the length of the attribute's name (which may be
    longer than 'buf_size') on success or negative for failure.

 DESCRIPTION
        This function retrieves the name of an attribute for an attribute ID.
    Up to 'buf_size' characters are stored in 'buf' followed by a '\0' string
    terminator.  If the name of the attribute is longer than 'buf_size'-1,
    the string terminator is stored in the last position of the buffer to
    properly terminate the string.
--------------------------------------------------------------------------*/
ssize_t
H5Aget_name(hid_t attr_id, size_t buf_size, char *buf)
{
    H5A_t		*attr;               /* Attribute object for ID */
    size_t              copy_len, nbytes;
    ssize_t		ret_value;

    FUNC_ENTER_API(H5Aget_name, FAIL)
    H5TRACE3("Zs", "iz*s", attr_id, buf_size, buf);

    /* check arguments */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
    if(!buf && buf_size)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid buffer")

    /* get the real attribute length */
    nbytes = HDstrlen(attr->name);
    HDassert((ssize_t)nbytes >= 0); /*overflow, pretty unlikely --rpm*/

    /* compute the string length which will fit into the user's buffer */
    copy_len = MIN(buf_size - 1, nbytes);

    /* Copy all/some of the name */
    if(buf && copy_len > 0) {
        HDmemcpy(buf, attr->name, copy_len);

        /* Terminate the string */
        buf[copy_len]='\0';
    } /* end if */

    /* Set return value */
    ret_value = (ssize_t)nbytes;

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Aget_name() */


/*-------------------------------------------------------------------------
 * Function:	H5Aget_name_by_idx
 *
 * Purpose:	Retrieve name of an attribute, according to the
 *		order within an index.
 *
 *              Same pattern of behavior as H5Iget_name.
 *
 * Return:	Success:	Non-negative length of name, with information
 *				in NAME buffer
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              February  8, 2007
 *
 *-------------------------------------------------------------------------
 */
ssize_t
H5Aget_name_by_idx(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, char *name /*out*/, size_t size,
    hid_t lapl_id)
{
    H5G_loc_t   loc;            /* Object location */
    H5A_t	*attr = NULL;   /* Attribute object for name */
    ssize_t	ret_value;      /* Return value */

    FUNC_ENTER_API(H5Aget_name_by_idx, FAIL)
    H5TRACE8("Zs", "i*sIiIohxzi", loc_id, obj_name, idx_type, order, n, name, size,
             lapl_id);

    /* Check args */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Open the attribute on the object header */
    if(NULL == (attr = H5A_open_by_idx(&loc, obj_name, idx_type, order, n, lapl_id, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")

    /* Get the length of the name */
    ret_value = (ssize_t)HDstrlen(attr->name);

    /* Copy the name into the user's buffer, if given */
    if(name) {
        HDstrncpy(name, attr->name, MIN((size_t)(ret_value + 1), size));
        if((size_t)ret_value >= size)
            name[size - 1]='\0';
    } /* end if */

done:
    /* Release resources */
    if(attr && H5A_close(attr) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_name_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5Aget_storage_size
 *
 * Purpose:	Returns the amount of storage size that is required for this
 *		attribute.
 *
 * Return:	Success:	The amount of storage size allocated for the
 *				attribute.  The return value may be zero
 *                              if no data has been stored.
 *
 *		Failure:	Zero
 *
 * Programmer:	Raymond Lu
 *              October 23, 2002
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5Aget_storage_size(hid_t attr_id)
{
    H5A_t	*attr;               /* Attribute object for ID */
    hsize_t	ret_value;      /* Return value */

    FUNC_ENTER_API(H5Aget_storage_size, 0)
    H5TRACE1("h", "i", attr_id);

    /* Check args */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, 0, "not an attribute")

    /* Set return value */
    ret_value = attr->data_size;

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_storage_size() */


/*-------------------------------------------------------------------------
 * Function:	H5Aget_info
 *
 * Purpose:	Retrieve information about an attribute.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              February  6, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Aget_info(hid_t attr_id, H5A_info_t *ainfo)
{
    H5A_t	*attr;                  /* Attribute object for name */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Aget_info, FAIL)
    H5TRACE2("e", "i*x", attr_id, ainfo);

    /* Check args */
    if(NULL == (attr = (H5A_t *)H5I_object_verify(attr_id, H5I_ATTR)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")

    /* Get the attribute information */
    if(H5A_get_info(attr, ainfo) < 0)
	HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_info() */


/*-------------------------------------------------------------------------
 * Function:	H5Aget_info_by_name
 *
 * Purpose:	Retrieve information about an attribute by name.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              February  6, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Aget_info_by_name(hid_t loc_id, const char *obj_name, const char *attr_name,
    H5A_info_t *ainfo, hid_t lapl_id)
{
    H5G_loc_t   loc;                    /* Object location */
    H5A_t	*attr = NULL;           /* Attribute object for name */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Aget_info_by_name, FAIL)
    H5TRACE5("e", "i*s*s*xi", loc_id, obj_name, attr_name, ainfo, lapl_id);

    /* Check args */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")
    if(NULL == ainfo)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid info pointer")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Open the attribute on the object header */
    if(NULL == (attr = H5A_open_by_name(&loc, obj_name, attr_name, lapl_id, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")

    /* Get the attribute information */
    if(H5A_get_info(attr, ainfo) < 0)
	HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")

done:
    /* Cleanup on failure */
    if(attr && H5A_close(attr) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_info_by_name() */


/*-------------------------------------------------------------------------
 * Function:	H5Aget_info_by_idx
 *
 * Purpose:	Retrieve information about an attribute, according to the
 *		order within an index.
 *
 * Return:	Success:	Non-negative with information in AINFO
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              February  8, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Aget_info_by_idx(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, H5A_info_t *ainfo, hid_t lapl_id)
{
    H5G_loc_t   loc;                    /* Object location */
    H5A_t	*attr = NULL;           /* Attribute object for name */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Aget_info_by_idx, FAIL)
    H5TRACE7("e", "i*sIiIoh*xi", loc_id, obj_name, idx_type, order, n, ainfo,
             lapl_id);

    /* Check args */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(NULL == ainfo)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid info pointer")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Open the attribute on the object header */
    if(NULL == (attr = H5A_open_by_idx(&loc, obj_name, idx_type, order, n, lapl_id, H5AC_ind_dxpl_id)))
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")

    /* Get the attribute information */
    if(H5A_get_info(attr, ainfo) < 0)
	HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")

done:
    /* Release resources */
    if(attr && H5A_close(attr) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")

    FUNC_LEAVE_API(ret_value)
} /* end H5Aget_info_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5A_get_info
 *
 * Purpose:	Retrieve information about an attribute.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *              February  6, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5A_get_info(const H5A_t *attr, H5A_info_t *ainfo)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(H5A_get_info, FAIL)

    /* Check args */
    HDassert(attr);
    HDassert(ainfo);

    /* Set info for attribute */
    ainfo->cset = attr->encoding;
    ainfo->data_size = attr->data_size;
    if(attr->crt_idx == H5O_MAX_CRT_ORDER_IDX) {
        ainfo->corder_valid = FALSE;
        ainfo->corder = 0;
    } /* end if */
    else {
        ainfo->corder_valid = TRUE;
        ainfo->corder = attr->crt_idx;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_get_info() */


/*-------------------------------------------------------------------------
 * Function:	H5Arename
 *
 * Purpose:     Rename an attribute
 *
 * Return:	Success:             Non-negative
 *		Failure:             Negative
 *
 * Programmer:	Raymond Lu
 *              October 23, 2002
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Arename(hid_t loc_id, const char *old_name, const char *new_name)
{
    H5G_loc_t	loc;	                /* Object location */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Arename, FAIL)
    H5TRACE3("e", "i*s*s", loc_id, old_name, new_name);

    /* check arguments */
    if(!old_name || !new_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "name is nil")
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, & loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")

    /* Avoid thrashing things if the names are the same */
    if(HDstrcmp(old_name, new_name))
        /* Call attribute rename routine */
        if(H5O_attr_rename(loc.oloc, H5AC_dxpl_id, old_name, new_name) < 0)
            HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Arename() */


/*-------------------------------------------------------------------------
 * Function:	H5Arename_by_name
 *
 * Purpose:     Rename an attribute
 *
 * Return:	Success:             Non-negative
 *		Failure:             Negative
 *
 * Programmer:	Quincey Koziol
 *              February 20, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Arename_by_name(hid_t loc_id, const char *obj_name, const char *old_attr_name,
    const char *new_attr_name, hid_t lapl_id)
{
    H5G_loc_t	loc;	                /* Object location */
    H5G_loc_t   obj_loc;                /* Location used to open group */
    H5G_name_t  obj_path;            	/* Opened object group hier. path */
    H5O_loc_t   obj_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Arename_by_name, FAIL)
    H5TRACE5("e", "i*s*s*si", loc_id, obj_name, old_attr_name, new_attr_name,
             lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(!old_attr_name || !*old_attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no old attribute name")
    if(!new_attr_name || !*new_attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no new attribute name")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Avoid thrashing things if the names are the same */
    if(HDstrcmp(old_attr_name, new_attr_name)) {
        /* Set up opened group location to fill in */
        obj_loc.oloc = &obj_oloc;
        obj_loc.path = &obj_path;
        H5G_loc_reset(&obj_loc);

        /* Find the object's location */
        if(H5G_loc_find(&loc, obj_name, &obj_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
            HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "object not found")
        loc_found = TRUE;

        /* Call attribute rename routine */
        if(H5O_attr_rename(obj_loc.oloc, H5AC_dxpl_id, old_attr_name, new_attr_name) < 0)
            HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")
    } /* end if */

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* H5Arename_by_name() */


/*--------------------------------------------------------------------------
 NAME
    H5Aiterate2
 PURPOSE
    Calls a user's function for each attribute on an object
 USAGE
    herr_t H5Aiterate2(loc_id, idx_type, order, idx, op, op_data)
        hid_t loc_id;           IN: Base location for object
        H5_index_t idx_type;    IN: Type of index to use
        H5_iter_order_t order;  IN: Order to iterate over index
        hsize_t *idx;           IN/OUT: Starting (IN) & Ending (OUT) attribute
                                    in index & order
        H5A_operator2_t op;     IN: User's function to pass each attribute to
        void *op_data;          IN/OUT: User's data to pass through to iterator
                                    operator function
 RETURNS
        Returns a negative value if an error occurs, the return value of the
    last operator if it was non-zero (which can be a negative value), or zero
    if all attributes were processed.

 DESCRIPTION
        This function interates over the attributes of dataset or group
    specified with 'loc_id' & 'obj_name'.  For each attribute of the object,
    the 'op_data' and some additional information (specified below) are passed
    to the 'op' function.  The iteration begins with the '*idx'
    object in the group and the next attribute to be processed by the operator
    is returned in '*idx'.
        The operation receives the ID for the group or dataset being iterated
    over ('loc_id'), the name of the current attribute about the object
    ('attr_name'), the attribute's "info" struct ('ainfo') and the pointer to
    the operator data passed in to H5Aiterate2 ('op_data').  The return values
    from an operator are:
        A. Zero causes the iterator to continue, returning zero when all
            attributes have been processed.
        B. Positive causes the iterator to immediately return that positive
            value, indicating short-circuit success.  The iterator can be
            restarted at the next attribute.
        C. Negative causes the iterator to immediately return that value,
            indicating failure.  The iterator can be restarted at the next
            attribute.
--------------------------------------------------------------------------*/
herr_t
H5Aiterate2(hid_t loc_id, H5_index_t idx_type, H5_iter_order_t order,
    hsize_t *idx, H5A_operator2_t op, void *op_data)
{
    H5A_attr_iter_op_t attr_op; /* Attribute operator */
    hsize_t	start_idx;      /* Index of attribute to start iterating at */
    hsize_t	last_attr;      /* Index of last attribute examined */
    herr_t	ret_value;      /* Return value */

    FUNC_ENTER_API(H5Aiterate2, FAIL)
    H5TRACE6("e", "iIiIo*hx*x", loc_id, idx_type, order, idx, op,
             op_data);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")

    /* Build attribute operator info */
    attr_op.op_type = H5A_ATTR_OP_APP2;
    attr_op.u.app_op2 = op;

    /* Call attribute iteration routine */
    last_attr = start_idx = (idx ? *idx : 0);
    if((ret_value = H5O_attr_iterate(loc_id, H5AC_ind_dxpl_id, idx_type, order, start_idx, &last_attr, &attr_op, op_data)) < 0)
        HERROR(H5E_ATTR, H5E_BADITER, "error iterating over attributes");

    /* Set the last attribute information */
    if(idx)
        *idx = last_attr;

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Aiterate2() */


/*--------------------------------------------------------------------------
 NAME
    H5Aiterate_by_name
 PURPOSE
    Calls a user's function for each attribute on an object
 USAGE
    herr_t H5Aiterate2(loc_id, obj_name, idx_type, order, idx, op, op_data, lapl_id)
        hid_t loc_id;           IN: Base location for object
        const char *obj_name;   IN: Name of object relative to location
        H5_index_t idx_type;    IN: Type of index to use
        H5_iter_order_t order;  IN: Order to iterate over index
        hsize_t *idx;           IN/OUT: Starting (IN) & Ending (OUT) attribute
                                    in index & order
        H5A_operator2_t op;     IN: User's function to pass each attribute to
        void *op_data;          IN/OUT: User's data to pass through to iterator
                                    operator function
        hid_t lapl_id;          IN: Link access property list
 RETURNS
        Returns a negative value if an error occurs, the return value of the
    last operator if it was non-zero (which can be a negative value), or zero
    if all attributes were processed.

 DESCRIPTION
        This function interates over the attributes of dataset or group
    specified with 'loc_id' & 'obj_name'.  For each attribute of the object,
    the 'op_data' and some additional information (specified below) are passed
    to the 'op' function.  The iteration begins with the '*idx'
    object in the group and the next attribute to be processed by the operator
    is returned in '*idx'.
        The operation receives the ID for the group or dataset being iterated
    over ('loc_id'), the name of the current attribute about the object
    ('attr_name'), the attribute's "info" struct ('ainfo') and the pointer to
    the operator data passed in to H5Aiterate_by_name ('op_data').  The return values
    from an operator are:
        A. Zero causes the iterator to continue, returning zero when all
            attributes have been processed.
        B. Positive causes the iterator to immediately return that positive
            value, indicating short-circuit success.  The iterator can be
            restarted at the next attribute.
        C. Negative causes the iterator to immediately return that value,
            indicating failure.  The iterator can be restarted at the next
            attribute.
--------------------------------------------------------------------------*/
herr_t
H5Aiterate_by_name(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t *idx, H5A_operator2_t op, void *op_data,
    hid_t lapl_id)
{
    H5G_loc_t	loc;	        /* Object location */
    H5G_loc_t   obj_loc;        /* Location used to open group */
    H5G_name_t  obj_path;       /* Opened object group hier. path */
    H5O_loc_t   obj_oloc;       /* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    hid_t       obj_loc_id = (-1);      /* ID for object located */
    H5A_attr_iter_op_t attr_op; /* Attribute operator */
    hsize_t	start_idx;      /* Index of attribute to start iterating at */
    hsize_t	last_attr;      /* Index of last attribute examined */
    herr_t	ret_value;      /* Return value */

    FUNC_ENTER_API(H5Aiterate_by_name, FAIL)
    H5TRACE8("e", "i*sIiIo*hx*xi", loc_id, obj_name, idx_type, order, idx, op,
             op_data, lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(&loc, obj_name, &obj_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "object not found")
    loc_found = TRUE;

    /* Open the object */
    if((obj_loc_id = H5O_open_by_loc(&obj_loc, H5AC_ind_dxpl_id)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open object")

    /* Build attribute operator info */
    attr_op.op_type = H5A_ATTR_OP_APP2;
    attr_op.u.app_op2 = op;

    /* Call attribute iteration routine */
    last_attr = start_idx = (idx ? *idx : 0);
    if((ret_value = H5O_attr_iterate(obj_loc_id, H5AC_ind_dxpl_id, idx_type, order, start_idx, &last_attr, &attr_op, op_data)) < 0)
        HERROR(H5E_ATTR, H5E_BADITER, "error iterating over attributes");

    /* Set the last attribute information */
    if(idx)
        *idx = last_attr;

done:
    /* Release resources */
    if(obj_loc_id > 0) {
        if(H5I_dec_ref(obj_loc_id) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "unable to close temporary object")
    } /* end if */
    else if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* H5Aiterate_by_name() */


/*--------------------------------------------------------------------------
 NAME
    H5Adelete
 PURPOSE
    Deletes an attribute from a location
 USAGE
    herr_t H5Adelete(loc_id, name)
        hid_t loc_id;       IN: Object (dataset or group) to have attribute deleted from
        const char *name;   IN: Name of attribute to delete
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    This function removes the named attribute from a dataset or group.
--------------------------------------------------------------------------*/
herr_t
H5Adelete(hid_t loc_id, const char *name)
{
    H5G_loc_t	loc;		        /* Object location */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Adelete, FAIL)
    H5TRACE2("e", "i*s", loc_id, name);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Delete the attribute from the location */
    if(H5O_attr_remove(loc.oloc, name, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Adelete() */


/*--------------------------------------------------------------------------
 NAME
    H5Adelete_by_name
 PURPOSE
    Deletes an attribute from a location
 USAGE
    herr_t H5Adelete_by_name(loc_id, obj_name, attr_name, lapl_id)
        hid_t loc_id;           IN: Base location for object
        const char *obj_name;   IN: Name of object relative to location
        const char *attr_name;  IN: Name of attribute to delete
        hid_t lapl_id;          IN: Link access property list
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
    This function removes the named attribute from an object.
--------------------------------------------------------------------------*/
herr_t
H5Adelete_by_name(hid_t loc_id, const char *obj_name, const char *attr_name,
    hid_t lapl_id)
{
    H5G_loc_t	loc;		        /* Object location */
    H5G_loc_t   obj_loc;                /* Location used to open group */
    H5G_name_t  obj_path;            	/* Opened object group hier. path */
    H5O_loc_t   obj_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Adelete_by_name, FAIL)
    H5TRACE4("e", "i*s*si", loc_id, obj_name, attr_name, lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(!attr_name || !*attr_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no attribute name")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(&loc, obj_name, &obj_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "object not found")
    loc_found = TRUE;

    /* Delete the attribute from the location */
    if(H5O_attr_remove(obj_loc.oloc, attr_name, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* H5Adelete_by_name() */


/*--------------------------------------------------------------------------
 NAME
    H5Adelete_by_idx
 PURPOSE
    Deletes an attribute from a location, according to the order within an index
 USAGE
    herr_t H5Adelete_by_idx(loc_id, obj_name, idx_type, order, n, lapl_id)
        hid_t loc_id;           IN: Base location for object
        const char *obj_name;   IN: Name of object relative to location
        H5_index_t idx_type;    IN: Type of index to use
        H5_iter_order_t order;  IN: Order to iterate over index
        hsize_t n;              IN: Offset within index
        hid_t lapl_id;          IN: Link access property list
 RETURNS
    Non-negative on success/Negative on failure
 DESCRIPTION
        This function removes an attribute from an object, using the IDX_TYPE
    index to delete the N'th attribute in ORDER direction in the index.  The
    object is specified relative to the LOC_ID with the OBJ_NAME path.  To
    remove an attribute on the object specified by LOC_ID, pass in "." for
    OBJ_NAME.  The link access property list, LAPL_ID, controls aspects of
    the group hierarchy traversal when using the OBJ_NAME to locate the final
    object to operate on.
--------------------------------------------------------------------------*/
herr_t
H5Adelete_by_idx(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
    H5_iter_order_t order, hsize_t n, hid_t lapl_id)
{
    H5G_loc_t	loc;		        /* Object location */
    H5G_loc_t   obj_loc;                /* Location used to open group */
    H5G_name_t  obj_path;            	/* Opened object group hier. path */
    H5O_loc_t   obj_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'obj_name' found */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Adelete_by_idx, FAIL)
    H5TRACE6("e", "i*sIiIohi", loc_id, obj_name, idx_type, order, n, lapl_id);

    /* check arguments */
    if(H5I_ATTR == H5I_get_type(loc_id))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!obj_name || !*obj_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no object name")
    if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Set up opened group location to fill in */
    obj_loc.oloc = &obj_oloc;
    obj_loc.path = &obj_path;
    H5G_loc_reset(&obj_loc);

    /* Find the object's location */
    if(H5G_loc_find(&loc, obj_name, &obj_loc/*out*/, lapl_id, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_NOTFOUND, FAIL, "object not found")
    loc_found = TRUE;

    /* Delete the attribute from the location */
    if(H5O_attr_remove_by_idx(obj_loc.oloc, idx_type, order, n, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")

done:
    /* Release resources */
    if(loc_found && H5G_loc_free(&obj_loc) < 0)
        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* H5Adelete_by_idx() */


/*--------------------------------------------------------------------------
 NAME
    H5Aclose
 PURPOSE
    Close an attribute ID
 USAGE
    herr_t H5Aclose (attr_id)
        hid_t attr_id;       IN: Attribute to release access to
 RETURNS
    Non-negative on success/Negative on failure

 DESCRIPTION
        This function releases an attribute from use.  Further use of the
    attribute ID will result in undefined behavior.
--------------------------------------------------------------------------*/
herr_t
H5Aclose(hid_t attr_id)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_API(H5Aclose, FAIL)
    H5TRACE1("e", "i", attr_id);

    /* check arguments */
    if(NULL == H5I_object_verify(attr_id, H5I_ATTR))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")

    /* Decrement references to that atom (and close it) */
    if(H5I_dec_ref(attr_id) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTDEC, FAIL, "can't close attribute")

done:
    FUNC_LEAVE_API(ret_value)
} /* H5Aclose() */


/*-------------------------------------------------------------------------
 * Function:	H5A_copy
 *
 * Purpose:	Copies attribute OLD_ATTR.
 *
 * Return:	Success:	Pointer to a new copy of the OLD_ATTR argument.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		Thursday, December  4, 1997
 *
 *-------------------------------------------------------------------------
 */
H5A_t *
H5A_copy(H5A_t *_new_attr, const H5A_t *old_attr)
{
    H5A_t	*new_attr = NULL;
    hbool_t     allocated_attr = FALSE;   /* Whether the attribute was allocated */
    H5A_t	*ret_value = NULL;        /* Return value */

    FUNC_ENTER_NOAPI(H5A_copy, NULL)

    /* check args */
    HDassert(old_attr);

    /* Allocate attribute structure */
    if(_new_attr == NULL) {
        if(NULL == (new_attr = H5FL_MALLOC(H5A_t)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
        allocated_attr = TRUE;
    } /* end if */
    else
        new_attr = _new_attr;

    /* Copy the top level of the attribute */
    *new_attr = *old_attr;

    /* Don't open the object header for a copy */
    new_attr->obj_opened = FALSE;

    /* Copy the guts of the attribute */
    if(NULL == (new_attr->name = H5MM_xstrdup(old_attr->name)))
	HGOTO_ERROR(H5E_ATTR, H5E_CANTCOPY, NULL, "unable to copy attribute name")
    if(NULL == (new_attr->dt = H5T_copy(old_attr->dt, H5T_COPY_ALL)))
	HGOTO_ERROR(H5E_ATTR, H5E_CANTCOPY, NULL, "unable to copy attribute datatype")
    if(NULL == (new_attr->ds = H5S_copy(old_attr->ds, FALSE)))
	HGOTO_ERROR(H5E_ATTR, H5E_CANTCOPY, NULL, "unable to copy attribute dataspace")

#if defined(H5_USING_MEMCHECKER) || !defined(NDEBUG)
    /* Clear object location */
    if(H5O_loc_reset(&(new_attr->oloc)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to reset location")

    /* Clear path name */
    if(H5G_name_reset(&(new_attr->path)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to reset path")
#endif /* H5_USING_MEMCHECKER */

    /* Copy the object location and group path */
    if(H5O_loc_copy(&(new_attr->oloc), &(old_attr->oloc), H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTCOPY, NULL, "can't copy object location")
    if(H5G_name_copy(&(new_attr->path), &(old_attr->path), H5_COPY_DEEP) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTCOPY, NULL, "can't copy path")

    /* Copy the attribute data, if there is any */
    if(old_attr->data) {
        /* Allocate data buffer for new attribute */
        if(NULL == (new_attr->data = H5FL_BLK_MALLOC(attr_buf, old_attr->data_size)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

        /* Copy the attribute data */
        HDmemcpy(new_attr->data, old_attr->data, old_attr->data_size);
    } /* end if */

    /* Set the return value */
    ret_value = new_attr;

done:
    if(ret_value == NULL)
        if(allocated_attr && new_attr && H5A_close(new_attr) < 0)
            HDONE_ERROR(H5E_ATTR, H5E_CANTFREE, NULL, "can't close attribute")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_copy() */


/*-------------------------------------------------------------------------
 * Function:	H5A_free
 *
 * Purpose:	Frees all memory associated with an attribute, but does not
 *              free the H5A_t structure (which should be done in H5T_close).
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Monday, November 15, 2004
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5A_free(H5A_t *attr)
{
    herr_t ret_value = SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI(H5A_free, FAIL)

    HDassert(attr);

    /* Free dynamicly allocated items */
    if(attr->name)
        H5MM_xfree(attr->name);
    if(attr->dt)
        if(H5T_close(attr->dt) < 0)
	    HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release datatype info")
    if(attr->ds)
        if(H5S_close(attr->ds) < 0)
	    HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release dataspace info")
    if(attr->data)
        attr->data = H5FL_BLK_FREE(attr_buf, attr->data);
    if(H5G_name_free(&(attr->path)) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release group hier. path")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_free() */


/*-------------------------------------------------------------------------
 * Function:	H5A_close
 *
 * Purpose:	Frees an attribute and all associated memory.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Monday, December  8, 1997
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5A_close(H5A_t *attr)
{
    herr_t ret_value = SUCCEED;           /* Return value */

    FUNC_ENTER_NOAPI(H5A_close, FAIL)

    HDassert(attr);

    /* Check if the attribute has any data yet, if not, fill with zeroes */
    if(attr->obj_opened && !attr->initialized && attr->data_size) {
        uint8_t *tmp_buf = H5FL_BLK_CALLOC(attr_buf, attr->data_size);
        if(NULL == tmp_buf)
            HGOTO_ERROR(H5E_ATTR, H5E_NOSPACE, FAIL, "memory allocation failed for attribute fill-value")

        /* Go write the fill data to the attribute */
        if(H5A_write(attr, attr->dt, tmp_buf, H5AC_dxpl_id) < 0)
            HGOTO_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute")

        /* Free temporary buffer */
        H5FL_BLK_FREE(attr_buf, tmp_buf);
    } /* end if */

    /* Free dynamicly allocated items */
    if(H5A_free(attr) < 0)
        HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release attribute info")

    /* Close the object's symbol-table entry */
    if(attr->obj_opened)
        if(H5O_close(&(attr->oloc)) < 0)
	    HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release object header info")

    H5FL_FREE(H5A_t, attr);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_close() */


/*-------------------------------------------------------------------------
 * Function:	H5A_oloc
 *
 * Purpose:	Return the object location for an attribute.  It's the
 *		object location for the object to which the attribute
 *		belongs, not the attribute itself.
 *
 * Return:	Success:	Ptr to entry
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Thursday, August  6, 1998
 *
 *-------------------------------------------------------------------------
 */
H5O_loc_t *
H5A_oloc(H5A_t *attr)
{
    H5O_loc_t *ret_value;   /* Return value */

    FUNC_ENTER_NOAPI(H5A_oloc, NULL)

    HDassert(attr);

    /* Set return value */
    ret_value = &(attr->oloc);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_oloc() */


/*-------------------------------------------------------------------------
 * Function:	H5A_nameof
 *
 * Purpose:	Return the group hier. path for an attribute.  It's the
 *		group hier. path for the object to which the attribute
 *		belongs, not the attribute itself.
 *
 * Return:	Success:	Ptr to entry
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, September 12, 2005
 *
 *-------------------------------------------------------------------------
 */
H5G_name_t *
H5A_nameof(H5A_t *attr)
{
    H5G_name_t *ret_value;   /* Return value */

    FUNC_ENTER_NOAPI(H5A_nameof, NULL)

    HDassert(attr);

    /* Set return value */
    ret_value=&(attr->path);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5A_nameof() */