summaryrefslogtreecommitdiff
path: root/util-linux/fdisk.c
blob: 06fb7f9b0cc3d977d3ecd7aea3eb43f919fc54b6 (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
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
/* vi: set sw=4 ts=4: */
/* fdisk.c -- Partition table manipulator for Linux.
 *
 * Copyright (C) 1992  A. V. Le Blanc (LeBlanc@mcc.ac.uk)
 * Copyright (C) 2001,2002 Vladimir Oleynik <dzo@simtreas.ru> (initial bb port)
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#ifndef _LARGEFILE64_SOURCE
/* For lseek64 */
# define _LARGEFILE64_SOURCE
#endif
#include <assert.h>             /* assert */
#include <sys/mount.h>
#if !defined(BLKSSZGET)
# define BLKSSZGET _IO(0x12, 104)
#endif
#if !defined(BLKGETSIZE64)
# define BLKGETSIZE64 _IOR(0x12,114,size_t)
#endif
#include "libbb.h"

#if BB_LITTLE_ENDIAN
# define inline_if_little_endian ALWAYS_INLINE
#else
# define inline_if_little_endian /* nothing */
#endif


/* Looks like someone forgot to add this to config system */
#ifndef ENABLE_FEATURE_FDISK_BLKSIZE
# define ENABLE_FEATURE_FDISK_BLKSIZE 0
# define IF_FEATURE_FDISK_BLKSIZE(a)
#endif

#define DEFAULT_SECTOR_SIZE      512
#define DEFAULT_SECTOR_SIZE_STR "512"
#define MAX_SECTOR_SIZE         2048
#define SECTOR_SIZE              512 /* still used in osf/sgi/sun code */
#define MAXIMUM_PARTS             60

#define ACTIVE_FLAG             0x80

#define EXTENDED                0x05
#define WIN98_EXTENDED          0x0f
#define LINUX_PARTITION         0x81
#define LINUX_SWAP              0x82
#define LINUX_NATIVE            0x83
#define LINUX_EXTENDED          0x85
#define LINUX_LVM               0x8e
#define LINUX_RAID              0xfd


enum {
	OPT_b = 1 << 0,
	OPT_C = 1 << 1,
	OPT_H = 1 << 2,
	OPT_l = 1 << 3,
	OPT_S = 1 << 4,
	OPT_u = 1 << 5,
	OPT_s = (1 << 6) * ENABLE_FEATURE_FDISK_BLKSIZE,
};


typedef unsigned long long ullong;
/* Used for sector numbers. Partition formats we know
 * do not support more than 2^32 sectors
 */
typedef uint32_t sector_t;
#if UINT_MAX == 4294967295
# define SECT_FMT ""
#elif ULONG_MAX == 4294967295
# define SECT_FMT "l"
#else
# error Cant detect sizeof(uint32_t)
#endif

struct hd_geometry {
	unsigned char heads;
	unsigned char sectors;
	unsigned short cylinders;
	unsigned long start;
};

#define HDIO_GETGEO     0x0301  /* get device geometry */

static const char msg_building_new_label[] ALIGN1 =
"Building a new %s. Changes will remain in memory only,\n"
"until you decide to write them. After that the previous content\n"
"won't be recoverable.\n\n";

static const char msg_part_already_defined[] ALIGN1 =
"Partition %u is already defined, delete it before re-adding\n";


struct partition {
	unsigned char boot_ind;         /* 0x80 - active */
	unsigned char head;             /* starting head */
	unsigned char sector;           /* starting sector */
	unsigned char cyl;              /* starting cylinder */
	unsigned char sys_ind;          /* what partition type */
	unsigned char end_head;         /* end head */
	unsigned char end_sector;       /* end sector */
	unsigned char end_cyl;          /* end cylinder */
	unsigned char start4[4];        /* starting sector counting from 0 */
	unsigned char size4[4];         /* nr of sectors in partition */
} PACKED;

static const char unable_to_open[] ALIGN1 = "can't open '%s'";
static const char unable_to_read[] ALIGN1 = "can't read from %s";
static const char unable_to_seek[] ALIGN1 = "can't seek on %s";

enum label_type {
	LABEL_DOS, LABEL_SUN, LABEL_SGI, LABEL_AIX, LABEL_OSF
};

#define LABEL_IS_DOS	(LABEL_DOS == current_label_type)

#if ENABLE_FEATURE_SUN_LABEL
#define LABEL_IS_SUN	(LABEL_SUN == current_label_type)
#define STATIC_SUN static
#else
#define LABEL_IS_SUN	0
#define STATIC_SUN extern
#endif

#if ENABLE_FEATURE_SGI_LABEL
#define LABEL_IS_SGI	(LABEL_SGI == current_label_type)
#define STATIC_SGI static
#else
#define LABEL_IS_SGI	0
#define STATIC_SGI extern
#endif

#if ENABLE_FEATURE_AIX_LABEL
#define LABEL_IS_AIX	(LABEL_AIX == current_label_type)
#define STATIC_AIX static
#else
#define LABEL_IS_AIX	0
#define STATIC_AIX extern
#endif

#if ENABLE_FEATURE_OSF_LABEL
#define LABEL_IS_OSF	(LABEL_OSF == current_label_type)
#define STATIC_OSF static
#else
#define LABEL_IS_OSF	0
#define STATIC_OSF extern
#endif

enum action { OPEN_MAIN, TRY_ONLY, CREATE_EMPTY_DOS, CREATE_EMPTY_SUN };

static void update_units(void);
#if ENABLE_FEATURE_FDISK_WRITABLE
static void change_units(void);
static void reread_partition_table(int leave);
static void delete_partition(int i);
static unsigned get_partition(int warn, unsigned max);
static void list_types(const char *const *sys);
static sector_t read_int(sector_t low, sector_t dflt, sector_t high, sector_t base, const char *mesg);
#endif
static const char *partition_type(unsigned char type);
static void get_geometry(void);
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what);
#else
static int get_boot(void);
#endif

#define PLURAL   0
#define SINGULAR 1

static sector_t get_start_sect(const struct partition *p);
static sector_t get_nr_sects(const struct partition *p);

/*
 * per partition table entry data
 *
 * The four primary partitions have the same sectorbuffer (MBRbuffer)
 * and have NULL ext_pointer.
 * Each logical partition table entry has two pointers, one for the
 * partition and one link to the next one.
 */
struct pte {
	struct partition *part_table;   /* points into sectorbuffer */
	struct partition *ext_pointer;  /* points into sectorbuffer */
	sector_t offset_from_dev_start; /* disk sector number */
	char *sectorbuffer;             /* disk sector contents */
#if ENABLE_FEATURE_FDISK_WRITABLE
	char changed;                   /* boolean */
#endif
};

/* DOS partition types */

static const char *const i386_sys_types[] = {
	"\x00" "Empty",
	"\x01" "FAT12",
	"\x04" "FAT16 <32M",
	"\x05" "Extended",         /* DOS 3.3+ extended partition */
	"\x06" "FAT16",            /* DOS 16-bit >=32M */
	"\x07" "HPFS/NTFS",        /* OS/2 IFS, eg, HPFS or NTFS or QNX */
	"\x0a" "OS/2 Boot Manager",/* OS/2 Boot Manager */
	"\x0b" "Win95 FAT32",
	"\x0c" "Win95 FAT32 (LBA)",/* LBA really is 'Extended Int 13h' */
	"\x0e" "Win95 FAT16 (LBA)",
	"\x0f" "Win95 Ext'd (LBA)",
	"\x11" "Hidden FAT12",
	"\x12" "Compaq diagnostics",
	"\x14" "Hidden FAT16 <32M",
	"\x16" "Hidden FAT16",
	"\x17" "Hidden HPFS/NTFS",
	"\x1b" "Hidden Win95 FAT32",
	"\x1c" "Hidden W95 FAT32 (LBA)",
	"\x1e" "Hidden W95 FAT16 (LBA)",
	"\x3c" "Part.Magic recovery",
	"\x41" "PPC PReP Boot",
	"\x42" "SFS",
	"\x63" "GNU HURD or SysV", /* GNU HURD or Mach or Sys V/386 (such as ISC UNIX) */
	"\x80" "Old Minix",        /* Minix 1.4a and earlier */
	"\x81" "Minix / old Linux",/* Minix 1.4b and later */
	"\x82" "Linux swap",       /* also Solaris */
	"\x83" "Linux",
	"\x84" "OS/2 hidden C: drive",
	"\x85" "Linux extended",
	"\x86" "NTFS volume set",
	"\x87" "NTFS volume set",
	"\x8e" "Linux LVM",
	"\x9f" "BSD/OS",           /* BSDI */
	"\xa0" "Thinkpad hibernation",
	"\xa5" "FreeBSD",          /* various BSD flavours */
	"\xa6" "OpenBSD",
	"\xa8" "Darwin UFS",
	"\xa9" "NetBSD",
	"\xab" "Darwin boot",
	"\xb7" "BSDI fs",
	"\xb8" "BSDI swap",
	"\xbe" "Solaris boot",
	"\xeb" "BeOS fs",
	"\xee" "EFI GPT",                    /* Intel EFI GUID Partition Table */
	"\xef" "EFI (FAT-12/16/32)",         /* Intel EFI System Partition */
	"\xf0" "Linux/PA-RISC boot",         /* Linux/PA-RISC boot loader */
	"\xf2" "DOS secondary",              /* DOS 3.3+ secondary */
	"\xfd" "Linux raid autodetect",      /* New (2.2.x) raid partition with
						autodetect using persistent
						superblock */
#if 0 /* ENABLE_WEIRD_PARTITION_TYPES */
	"\x02" "XENIX root",
	"\x03" "XENIX usr",
	"\x08" "AIX",              /* AIX boot (AIX -- PS/2 port) or SplitDrive */
	"\x09" "AIX bootable",     /* AIX data or Coherent */
	"\x10" "OPUS",
	"\x18" "AST SmartSleep",
	"\x24" "NEC DOS",
	"\x39" "Plan 9",
	"\x40" "Venix 80286",
	"\x4d" "QNX4.x",
	"\x4e" "QNX4.x 2nd part",
	"\x4f" "QNX4.x 3rd part",
	"\x50" "OnTrack DM",
	"\x51" "OnTrack DM6 Aux1", /* (or Novell) */
	"\x52" "CP/M",             /* CP/M or Microport SysV/AT */
	"\x53" "OnTrack DM6 Aux3",
	"\x54" "OnTrackDM6",
	"\x55" "EZ-Drive",
	"\x56" "Golden Bow",
	"\x5c" "Priam Edisk",
	"\x61" "SpeedStor",
	"\x64" "Novell Netware 286",
	"\x65" "Novell Netware 386",
	"\x70" "DiskSecure Multi-Boot",
	"\x75" "PC/IX",
	"\x93" "Amoeba",
	"\x94" "Amoeba BBT",       /* (bad block table) */
	"\xa7" "NeXTSTEP",
	"\xbb" "Boot Wizard hidden",
	"\xc1" "DRDOS/sec (FAT-12)",
	"\xc4" "DRDOS/sec (FAT-16 < 32M)",
	"\xc6" "DRDOS/sec (FAT-16)",
	"\xc7" "Syrinx",
	"\xda" "Non-FS data",
	"\xdb" "CP/M / CTOS / ...",/* CP/M or Concurrent CP/M or
	                              Concurrent DOS or CTOS */
	"\xde" "Dell Utility",     /* Dell PowerEdge Server utilities */
	"\xdf" "BootIt",           /* BootIt EMBRM */
	"\xe1" "DOS access",       /* DOS access or SpeedStor 12-bit FAT
	                              extended partition */
	"\xe3" "DOS R/O",          /* DOS R/O or SpeedStor */
	"\xe4" "SpeedStor",        /* SpeedStor 16-bit FAT extended
	                              partition < 1024 cyl. */
	"\xf1" "SpeedStor",
	"\xf4" "SpeedStor",        /* SpeedStor large partition */
	"\xfe" "LANstep",          /* SpeedStor >1024 cyl. or LANstep */
	"\xff" "BBT",              /* Xenix Bad Block Table */
#endif
	NULL
};

enum {
	dev_fd = 3                  /* the disk */
};

/* Globals */
struct globals {
	char *line_ptr;

	const char *disk_device;
	int g_partitions; // = 4;       /* maximum partition + 1 */
	unsigned units_per_sector; // = 1;
	unsigned sector_size; // = DEFAULT_SECTOR_SIZE;
	unsigned user_set_sector_size;
	unsigned sector_offset; // = 1;
	unsigned g_heads, g_sectors, g_cylinders;
	smallint /* enum label_type */ current_label_type;
	smallint display_in_cyl_units; // = 1;
#if ENABLE_FEATURE_OSF_LABEL
	smallint possibly_osf_label;
#endif

	smallint listing;               /* no aborts for fdisk -l */
	smallint dos_compatible_flag; // = 1;
#if ENABLE_FEATURE_FDISK_WRITABLE
	//int dos_changed;
	smallint nowarn;                /* no warnings for fdisk -l/-s */
#endif
	int ext_index;                  /* the prime extended partition */
	unsigned user_cylinders, user_heads, user_sectors;
	unsigned pt_heads, pt_sectors;
	unsigned kern_heads, kern_sectors;
	sector_t extended_offset;       /* offset of link pointers */
	sector_t total_number_of_sectors;

	jmp_buf listingbuf;
	char line_buffer[80];
	char partname_buffer[80];
	/* Raw disk label. For DOS-type partition tables the MBR,
	 * with descriptions of the primary partitions. */
	char MBRbuffer[MAX_SECTOR_SIZE];
	/* Partition tables */
	struct pte ptes[MAXIMUM_PARTS];
};
#define G (*ptr_to_globals)
#define line_ptr             (G.line_ptr            )
#define disk_device          (G.disk_device         )
#define g_partitions         (G.g_partitions        )
#define units_per_sector     (G.units_per_sector    )
#define sector_size          (G.sector_size         )
#define user_set_sector_size (G.user_set_sector_size)
#define sector_offset        (G.sector_offset       )
#define g_heads              (G.g_heads             )
#define g_sectors            (G.g_sectors           )
#define g_cylinders          (G.g_cylinders         )
#define current_label_type   (G.current_label_type  )
#define display_in_cyl_units (G.display_in_cyl_units)
#define possibly_osf_label   (G.possibly_osf_label  )
#define listing                 (G.listing                )
#define dos_compatible_flag     (G.dos_compatible_flag    )
#define nowarn                  (G.nowarn                 )
#define ext_index               (G.ext_index              )
#define user_cylinders          (G.user_cylinders         )
#define user_heads              (G.user_heads             )
#define user_sectors            (G.user_sectors           )
#define pt_heads                (G.pt_heads               )
#define pt_sectors              (G.pt_sectors             )
#define kern_heads              (G.kern_heads             )
#define kern_sectors            (G.kern_sectors           )
#define extended_offset         (G.extended_offset        )
#define total_number_of_sectors (G.total_number_of_sectors)
#define listingbuf      (G.listingbuf     )
#define line_buffer     (G.line_buffer    )
#define partname_buffer (G.partname_buffer)
#define MBRbuffer       (G.MBRbuffer      )
#define ptes            (G.ptes           )
#define INIT_G() do { \
	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
	sector_size = DEFAULT_SECTOR_SIZE; \
	sector_offset = 1; \
	g_partitions = 4; \
	display_in_cyl_units = 1; \
	units_per_sector = 1; \
	dos_compatible_flag = 1; \
} while (0)


/* TODO: move to libbb? */
/* TODO: return unsigned long long, FEATURE_FDISK_BLKSIZE _can_ handle
 * disks > 2^32 sectors
 */
static sector_t bb_BLKGETSIZE_sectors(int fd)
{
	uint64_t v64;
	unsigned long longsectors;

	if (ioctl(fd, BLKGETSIZE64, &v64) == 0) {
		/* Got bytes, convert to 512 byte sectors */
		v64 >>= 9;
		if (v64 != (sector_t)v64) {
 ret_trunc:
			/* Not only DOS, but all other partition tables
			 * we support can't record more than 32 bit
			 * sector counts or offsets
			 */
			bb_error_msg("device has more than 2^32 sectors, can't use all of them");
			v64 = (uint32_t)-1L;
		}
		return v64;
	}
	/* Needs temp of type long */
	if (ioctl(fd, BLKGETSIZE, &longsectors)) {
		/* Perhaps this is a disk image */
		off_t sz = lseek(fd, 0, SEEK_END);
		longsectors = 0;
		if (sz > 0)
			longsectors = (uoff_t)sz / sector_size;
		lseek(fd, 0, SEEK_SET);
	}
	if (sizeof(long) > sizeof(sector_t)
	 && longsectors != (sector_t)longsectors
	) {
		goto ret_trunc;
	}
	return longsectors;
}


#define IS_EXTENDED(i) \
	((i) == EXTENDED || (i) == WIN98_EXTENDED || (i) == LINUX_EXTENDED)

#define cround(n)       (display_in_cyl_units ? ((n)/units_per_sector)+1 : (n))

#define scround(x)      (((x)+units_per_sector-1)/units_per_sector)

#define pt_offset(b, n) \
	((struct partition *)((b) + 0x1be + (n) * sizeof(struct partition)))

#define sector(s)       ((s) & 0x3f)

#define cylinder(s, c)  ((c) | (((s) & 0xc0) << 2))

#define hsc2sector(h,s,c) \
	(sector(s) - 1 + sectors * ((h) + heads * cylinder(s,c)))

static void
close_dev_fd(void)
{
	/* Not really closing, but making sure it is open, and to harmless place */
	xmove_fd(xopen(bb_dev_null, O_RDONLY), dev_fd);
}

/*
 * Return partition name - uses static storage
 */
static const char *
partname(const char *dev, int pno, int lth)
{
	const char *p;
	int w, wp;
	int bufsiz;
	char *bufp;

	bufp = partname_buffer;
	bufsiz = sizeof(partname_buffer);

	w = strlen(dev);
	p = "";

	if (isdigit(dev[w-1]))
		p = "p";

	/* devfs kludge - note: fdisk partition names are not supposed
	   to equal kernel names, so there is no reason to do this */
	if (strcmp(dev + w - 4, "disc") == 0) {
		w -= 4;
		p = "part";
	}

	wp = strlen(p);

	if (lth) {
		snprintf(bufp, bufsiz, "%*.*s%s%-2u",
			lth-wp-2, w, dev, p, pno);
	} else {
		snprintf(bufp, bufsiz, "%.*s%s%-2u", w, dev, p, pno);
	}
	return bufp;
}

static ALWAYS_INLINE struct partition *
get_part_table(int i)
{
	return ptes[i].part_table;
}

static const char *
str_units(int n)
{      /* n==1: use singular */
	if (n == 1)
		return display_in_cyl_units ? "cylinder" : "sector";
	return display_in_cyl_units ? "cylinders" : "sectors";
}

static int
valid_part_table_flag(const char *mbuffer)
{
	return (mbuffer[510] == 0x55 && (uint8_t)mbuffer[511] == 0xaa);
}

static void fdisk_fatal(const char *why)
{
	if (listing) {
		close_dev_fd();
		longjmp(listingbuf, 1);
	}
	bb_error_msg_and_die(why, disk_device);
}

static void
seek_sector(sector_t secno)
{
#if ENABLE_FDISK_SUPPORT_LARGE_DISKS
	off64_t off = (off64_t)secno * sector_size;
	if (lseek64(dev_fd, off, SEEK_SET) == (off64_t) -1)
		fdisk_fatal(unable_to_seek);
#else
	uint64_t off = (uint64_t)secno * sector_size;
	if (off > MAXINT(off_t)
	 || lseek(dev_fd, (off_t)off, SEEK_SET) == (off_t) -1
	) {
		fdisk_fatal(unable_to_seek);
	}
#endif
}

#if ENABLE_FEATURE_FDISK_WRITABLE
/* Read line; return 0 or first printable char */
static int
read_line(const char *prompt)
{
	int sz;

	sz = read_line_input(prompt, line_buffer, sizeof(line_buffer), NULL);
	if (sz <= 0)
		exit(EXIT_SUCCESS); /* Ctrl-D or Ctrl-C */

	if (line_buffer[sz-1] == '\n')
		line_buffer[--sz] = '\0';

	line_ptr = line_buffer;
	while (*line_ptr != '\0' && (unsigned char)*line_ptr <= ' ')
		line_ptr++;
	return *line_ptr;
}

static void
set_all_unchanged(void)
{
	int i;

	for (i = 0; i < MAXIMUM_PARTS; i++)
		ptes[i].changed = 0;
}

static ALWAYS_INLINE void
set_changed(int i)
{
	ptes[i].changed = 1;
}

static ALWAYS_INLINE void
write_part_table_flag(char *b)
{
	b[510] = 0x55;
	b[511] = 0xaa;
}

static char
read_nonempty(const char *mesg)
{
	while (!read_line(mesg))
		continue;
	return *line_ptr;
}

static char
read_maybe_empty(const char *mesg)
{
	if (!read_line(mesg)) {
		line_ptr = line_buffer;
		line_ptr[0] = '\n';
		line_ptr[1] = '\0';
	}
	return line_ptr[0];
}

static int
read_hex(const char *const *sys)
{
	unsigned long v;
	while (1) {
		read_nonempty("Hex code (type L to list codes): ");
		if ((line_ptr[0] | 0x20) == 'l') {
			list_types(sys);
			continue;
		}
		v = bb_strtoul(line_ptr, NULL, 16);
		if (v <= 0xff)
			return v;
	}
}

static void
write_sector(sector_t secno, const void *buf)
{
	seek_sector(secno);
	xwrite(dev_fd, buf, sector_size);
}
#endif /* FEATURE_FDISK_WRITABLE */


#include "fdisk_aix.c"

struct sun_partition {
	unsigned char info[128];   /* Informative text string */
	unsigned char spare0[14];
	struct sun_info {
		unsigned char spare1;
		unsigned char id;
		unsigned char spare2;
		unsigned char flags;
	} infos[8];
	unsigned char spare1[246]; /* Boot information etc. */
	unsigned short rspeed;     /* Disk rotational speed */
	unsigned short pcylcount;  /* Physical cylinder count */
	unsigned short sparecyl;   /* extra sects per cylinder */
	unsigned char spare2[4];   /* More magic... */
	unsigned short ilfact;     /* Interleave factor */
	unsigned short ncyl;       /* Data cylinder count */
	unsigned short nacyl;      /* Alt. cylinder count */
	unsigned short ntrks;      /* Tracks per cylinder */
	unsigned short nsect;      /* Sectors per track */
	unsigned char spare3[4];   /* Even more magic... */
	struct sun_partinfo {
		uint32_t start_cylinder;
		uint32_t num_sectors;
	} partitions[8];
	unsigned short magic;      /* Magic number */
	unsigned short csum;       /* Label xor'd checksum */
} FIX_ALIASING;
typedef struct sun_partition sun_partition;
#define sunlabel ((sun_partition *)MBRbuffer)
STATIC_OSF void bsd_select(void);
STATIC_OSF void xbsd_print_disklabel(int);
#include "fdisk_osf.c"

#if ENABLE_FEATURE_SGI_LABEL || ENABLE_FEATURE_SUN_LABEL
static uint16_t
fdisk_swap16(uint16_t x)
{
	return (x << 8) | (x >> 8);
}

static uint32_t
fdisk_swap32(uint32_t x)
{
	return (x << 24) |
	       ((x & 0xFF00) << 8) |
	       ((x & 0xFF0000) >> 8) |
	       (x >> 24);
}
#endif

STATIC_SGI const char *const sgi_sys_types[];
STATIC_SGI unsigned sgi_get_num_sectors(int i);
STATIC_SGI int sgi_get_sysid(int i);
STATIC_SGI void sgi_delete_partition(int i);
STATIC_SGI void sgi_change_sysid(int i, int sys);
STATIC_SGI void sgi_list_table(int xtra);
#if ENABLE_FEATURE_FDISK_ADVANCED
STATIC_SGI void sgi_set_xcyl(void);
#endif
STATIC_SGI int verify_sgi(int verbose);
STATIC_SGI void sgi_add_partition(int n, int sys);
STATIC_SGI void sgi_set_swappartition(int i);
STATIC_SGI const char *sgi_get_bootfile(void);
STATIC_SGI void sgi_set_bootfile(const char* aFile);
STATIC_SGI void create_sgiinfo(void);
STATIC_SGI void sgi_write_table(void);
STATIC_SGI void sgi_set_bootpartition(int i);
#include "fdisk_sgi.c"

STATIC_SUN const char *const sun_sys_types[];
STATIC_SUN void sun_delete_partition(int i);
STATIC_SUN void sun_change_sysid(int i, int sys);
STATIC_SUN void sun_list_table(int xtra);
STATIC_SUN void add_sun_partition(int n, int sys);
#if ENABLE_FEATURE_FDISK_ADVANCED
STATIC_SUN void sun_set_alt_cyl(void);
STATIC_SUN void sun_set_ncyl(int cyl);
STATIC_SUN void sun_set_xcyl(void);
STATIC_SUN void sun_set_ilfact(void);
STATIC_SUN void sun_set_rspeed(void);
STATIC_SUN void sun_set_pcylcount(void);
#endif
STATIC_SUN void toggle_sunflags(int i, unsigned char mask);
STATIC_SUN void verify_sun(void);
STATIC_SUN void sun_write_table(void);
#include "fdisk_sun.c"


static inline_if_little_endian unsigned
read4_little_endian(const unsigned char *cp)
{
	uint32_t v;
	move_from_unaligned32(v, cp);
	return SWAP_LE32(v);
}

static sector_t
get_start_sect(const struct partition *p)
{
	return read4_little_endian(p->start4);
}

static sector_t
get_nr_sects(const struct partition *p)
{
	return read4_little_endian(p->size4);
}

#if ENABLE_FEATURE_FDISK_WRITABLE
/* start_sect and nr_sects are stored little endian on all machines */
/* moreover, they are not aligned correctly */
static inline_if_little_endian void
store4_little_endian(unsigned char *cp, unsigned val)
{
	uint32_t v = SWAP_LE32(val);
	move_to_unaligned32(cp, v);
}

static void
set_start_sect(struct partition *p, unsigned start_sect)
{
	store4_little_endian(p->start4, start_sect);
}

static void
set_nr_sects(struct partition *p, unsigned nr_sects)
{
	store4_little_endian(p->size4, nr_sects);
}
#endif

/* Allocate a buffer and read a partition table sector */
static void
read_pte(struct pte *pe, sector_t offset)
{
	pe->offset_from_dev_start = offset;
	pe->sectorbuffer = xzalloc(sector_size);
	seek_sector(offset);
	/* xread would make us abort - bad for fdisk -l */
	if (full_read(dev_fd, pe->sectorbuffer, sector_size) != sector_size)
		fdisk_fatal(unable_to_read);
#if ENABLE_FEATURE_FDISK_WRITABLE
	pe->changed = 0;
#endif
	pe->part_table = pe->ext_pointer = NULL;
}

static sector_t
get_partition_start_from_dev_start(const struct pte *pe)
{
	return pe->offset_from_dev_start + get_start_sect(pe->part_table);
}

#if ENABLE_FEATURE_FDISK_WRITABLE
/*
 * Avoid warning about DOS partitions when no DOS partition was changed.
 * Here a heuristic "is probably dos partition".
 * We might also do the opposite and warn in all cases except
 * for "is probably nondos partition".
 */
#ifdef UNUSED
static int
is_dos_partition(int t)
{
	return (t == 1 || t == 4 || t == 6 ||
		t == 0x0b || t == 0x0c || t == 0x0e ||
		t == 0x11 || t == 0x12 || t == 0x14 || t == 0x16 ||
		t == 0x1b || t == 0x1c || t == 0x1e || t == 0x24 ||
		t == 0xc1 || t == 0xc4 || t == 0xc6);
}
#endif

static void
menu(void)
{
	puts("Command Action");
	if (LABEL_IS_SUN) {
		puts("a\ttoggle a read only flag");           /* sun */
		puts("b\tedit bsd disklabel");
		puts("c\ttoggle the mountable flag");         /* sun */
		puts("d\tdelete a partition");
		puts("l\tlist known partition types");
		puts("n\tadd a new partition");
		puts("o\tcreate a new empty DOS partition table");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("s\tcreate a new empty Sun disklabel");  /* sun */
		puts("t\tchange a partition's system id");
		puts("u\tchange display/entry units");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
#if ENABLE_FEATURE_FDISK_ADVANCED
		puts("x\textra functionality (experts only)");
#endif
	} else if (LABEL_IS_SGI) {
		puts("a\tselect bootable partition");    /* sgi flavour */
		puts("b\tedit bootfile entry");          /* sgi */
		puts("c\tselect sgi swap partition");    /* sgi flavour */
		puts("d\tdelete a partition");
		puts("l\tlist known partition types");
		puts("n\tadd a new partition");
		puts("o\tcreate a new empty DOS partition table");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("s\tcreate a new empty Sun disklabel");  /* sun */
		puts("t\tchange a partition's system id");
		puts("u\tchange display/entry units");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
	} else if (LABEL_IS_AIX) {
		puts("o\tcreate a new empty DOS partition table");
		puts("q\tquit without saving changes");
		puts("s\tcreate a new empty Sun disklabel");  /* sun */
	} else {
		puts("a\ttoggle a bootable flag");
		puts("b\tedit bsd disklabel");
		puts("c\ttoggle the dos compatibility flag");
		puts("d\tdelete a partition");
		puts("l\tlist known partition types");
		puts("n\tadd a new partition");
		puts("o\tcreate a new empty DOS partition table");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("s\tcreate a new empty Sun disklabel");  /* sun */
		puts("t\tchange a partition's system id");
		puts("u\tchange display/entry units");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
#if ENABLE_FEATURE_FDISK_ADVANCED
		puts("x\textra functionality (experts only)");
#endif
	}
}
#endif /* FEATURE_FDISK_WRITABLE */


#if ENABLE_FEATURE_FDISK_ADVANCED
static void
xmenu(void)
{
	puts("Command Action");
	if (LABEL_IS_SUN) {
		puts("a\tchange number of alternate cylinders");      /*sun*/
		puts("c\tchange number of cylinders");
		puts("d\tprint the raw data in the partition table");
		puts("e\tchange number of extra sectors per cylinder");/*sun*/
		puts("h\tchange number of heads");
		puts("i\tchange interleave factor");                  /*sun*/
		puts("o\tchange rotation speed (rpm)");               /*sun*/
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("r\treturn to main menu");
		puts("s\tchange number of sectors/track");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
		puts("y\tchange number of physical cylinders");       /*sun*/
	} else if (LABEL_IS_SGI) {
		puts("b\tmove beginning of data in a partition"); /* !sun */
		puts("c\tchange number of cylinders");
		puts("d\tprint the raw data in the partition table");
		puts("e\tlist extended partitions");          /* !sun */
		puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
		puts("h\tchange number of heads");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("r\treturn to main menu");
		puts("s\tchange number of sectors/track");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
	} else if (LABEL_IS_AIX) {
		puts("b\tmove beginning of data in a partition"); /* !sun */
		puts("c\tchange number of cylinders");
		puts("d\tprint the raw data in the partition table");
		puts("e\tlist extended partitions");          /* !sun */
		puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
		puts("h\tchange number of heads");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("r\treturn to main menu");
		puts("s\tchange number of sectors/track");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
	} else {
		puts("b\tmove beginning of data in a partition"); /* !sun */
		puts("c\tchange number of cylinders");
		puts("d\tprint the raw data in the partition table");
		puts("e\tlist extended partitions");          /* !sun */
		puts("f\tfix partition order");               /* !sun, !aix, !sgi */
#if ENABLE_FEATURE_SGI_LABEL
		puts("g\tcreate an IRIX (SGI) partition table");/* sgi */
#endif
		puts("h\tchange number of heads");
		puts("p\tprint the partition table");
		puts("q\tquit without saving changes");
		puts("r\treturn to main menu");
		puts("s\tchange number of sectors/track");
		puts("v\tverify the partition table");
		puts("w\twrite table to disk and exit");
	}
}
#endif /* ADVANCED mode */

#if ENABLE_FEATURE_FDISK_WRITABLE
static const char *const *
get_sys_types(void)
{
	return (
		LABEL_IS_SUN ? sun_sys_types :
		LABEL_IS_SGI ? sgi_sys_types :
		i386_sys_types);
}
#else
#define get_sys_types() i386_sys_types
#endif

static const char *
partition_type(unsigned char type)
{
	int i;
	const char *const *types = get_sys_types();

	for (i = 0; types[i]; i++)
		if ((unsigned char)types[i][0] == type)
			return types[i] + 1;

	return "Unknown";
}

static int
is_cleared_partition(const struct partition *p)
{
	/* We consider partition "cleared" only if it has only zeros */
	const char *cp = (const char *)p;
	int cnt = sizeof(*p);
	char bits = 0;
	while (--cnt >= 0)
		bits |= *cp++;
	return (bits == 0);
}

static void
clear_partition(struct partition *p)
{
	if (p)
		memset(p, 0, sizeof(*p));
}

#if ENABLE_FEATURE_FDISK_WRITABLE
static int
get_sysid(int i)
{
	return LABEL_IS_SUN ? sunlabel->infos[i].id :
			(LABEL_IS_SGI ? sgi_get_sysid(i) :
				ptes[i].part_table->sys_ind);
}

static void
list_types(const char *const *sys)
{
	enum { COLS = 3 };

	unsigned last[COLS];
	unsigned done, next, size;
	int i;

	for (size = 0; sys[size]; size++)
		continue;

	done = 0;
	for (i = COLS-1; i >= 0; i--) {
		done += (size + i - done) / (i + 1);
		last[COLS-1 - i] = done;
	}

	i = done = next = 0;
	do {
		printf("%c%2x %-22.22s", i ? ' ' : '\n',
			(unsigned char)sys[next][0],
			sys[next] + 1);
		next = last[i++] + done;
		if (i >= COLS || next >= last[i]) {
			i = 0;
			next = ++done;
		}
	} while (done < last[0]);
	bb_putchar('\n');
}

#define set_hsc(h, s, c, sector) do \
{ \
	s = sector % g_sectors + 1;  \
	sector /= g_sectors;         \
	h = sector % g_heads;        \
	sector /= g_heads;           \
	c = sector & 0xff;           \
	s |= (sector >> 2) & 0xc0;   \
} while (0)

static void set_hsc_start_end(struct partition *p, sector_t start, sector_t stop)
{
	if (dos_compatible_flag && (start / (g_sectors * g_heads) > 1023))
		start = g_heads * g_sectors * 1024 - 1;
	set_hsc(p->head, p->sector, p->cyl, start);

	if (dos_compatible_flag && (stop / (g_sectors * g_heads) > 1023))
		stop = g_heads * g_sectors * 1024 - 1;
	set_hsc(p->end_head, p->end_sector, p->end_cyl, stop);
}

static void
set_partition(int i, int doext, sector_t start, sector_t stop, int sysid)
{
	struct partition *p;
	sector_t offset;

	if (doext) {
		p = ptes[i].ext_pointer;
		offset = extended_offset;
	} else {
		p = ptes[i].part_table;
		offset = ptes[i].offset_from_dev_start;
	}
	p->boot_ind = 0;
	p->sys_ind = sysid;
	set_start_sect(p, start - offset);
	set_nr_sects(p, stop - start + 1);
	set_hsc_start_end(p, start, stop);
	ptes[i].changed = 1;
}
#endif

static int
warn_geometry(void)
{
	if (g_heads && g_sectors && g_cylinders)
		return 0;

	printf("Unknown value(s) for:");
	if (!g_heads)
		printf(" heads");
	if (!g_sectors)
		printf(" sectors");
	if (!g_cylinders)
		printf(" cylinders");
	printf(
#if ENABLE_FEATURE_FDISK_WRITABLE
		" (settable in the extra functions menu)"
#endif
		"\n");
	return 1;
}

static void
update_units(void)
{
	int cyl_units = g_heads * g_sectors;

	if (display_in_cyl_units && cyl_units)
		units_per_sector = cyl_units;
	else
		units_per_sector = 1;   /* in sectors */
}

#if ENABLE_FEATURE_FDISK_WRITABLE
static void
warn_cylinders(void)
{
	if (LABEL_IS_DOS && g_cylinders > 1024 && !nowarn)
		printf("\n"
"The number of cylinders for this disk is set to %u.\n"
"There is nothing wrong with that, but this is larger than 1024,\n"
"and could in certain setups cause problems with:\n"
"1) software that runs at boot time (e.g., old versions of LILO)\n"
"2) booting and partitioning software from other OSs\n"
"   (e.g., DOS FDISK, OS/2 FDISK)\n",
			g_cylinders);
}
#endif

static void
read_extended(int ext)
{
	int i;
	struct pte *pex;
	struct partition *p, *q;

	ext_index = ext;
	pex = &ptes[ext];
	pex->ext_pointer = pex->part_table;

	p = pex->part_table;
	if (!get_start_sect(p)) {
		printf("Bad offset in primary extended partition\n");
		return;
	}

	while (IS_EXTENDED(p->sys_ind)) {
		struct pte *pe = &ptes[g_partitions];

		if (g_partitions >= MAXIMUM_PARTS) {
			/* This is not a Linux restriction, but
			   this program uses arrays of size MAXIMUM_PARTS.
			   Do not try to 'improve' this test. */
			struct pte *pre = &ptes[g_partitions - 1];
#if ENABLE_FEATURE_FDISK_WRITABLE
			printf("Warning: deleting partitions after %u\n",
				g_partitions);
			pre->changed = 1;
#endif
			clear_partition(pre->ext_pointer);
			return;
		}

		read_pte(pe, extended_offset + get_start_sect(p));

		if (!extended_offset)
			extended_offset = get_start_sect(p);

		q = p = pt_offset(pe->sectorbuffer, 0);
		for (i = 0; i < 4; i++, p++) if (get_nr_sects(p)) {
			if (IS_EXTENDED(p->sys_ind)) {
				if (pe->ext_pointer)
					printf("Warning: extra link "
						"pointer in partition table"
						" %u\n", g_partitions + 1);
				else
					pe->ext_pointer = p;
			} else if (p->sys_ind) {
				if (pe->part_table)
					printf("Warning: ignoring extra "
						  "data in partition table"
						  " %u\n", g_partitions + 1);
				else
					pe->part_table = p;
			}
		}

		/* very strange code here... */
		if (!pe->part_table) {
			if (q != pe->ext_pointer)
				pe->part_table = q;
			else
				pe->part_table = q + 1;
		}
		if (!pe->ext_pointer) {
			if (q != pe->part_table)
				pe->ext_pointer = q;
			else
				pe->ext_pointer = q + 1;
		}

		p = pe->ext_pointer;
		g_partitions++;
	}

#if ENABLE_FEATURE_FDISK_WRITABLE
	/* remove empty links */
 remove:
	for (i = 4; i < g_partitions; i++) {
		struct pte *pe = &ptes[i];

		if (!get_nr_sects(pe->part_table)
		 && (g_partitions > 5 || ptes[4].part_table->sys_ind)
		) {
			printf("Omitting empty partition (%u)\n", i+1);
			delete_partition(i);
			goto remove;    /* numbering changed */
		}
	}
#endif
}

#if ENABLE_FEATURE_FDISK_WRITABLE
static void
create_doslabel(void)
{
	printf(msg_building_new_label, "DOS disklabel");

	current_label_type = LABEL_DOS;
#if ENABLE_FEATURE_OSF_LABEL
	possibly_osf_label = 0;
#endif
	g_partitions = 4;

	memset(&MBRbuffer[510 - 4*16], 0, 4*16);
	write_part_table_flag(MBRbuffer);
	extended_offset = 0;
	set_all_unchanged();
	set_changed(0);
	get_boot(CREATE_EMPTY_DOS);
}
#endif

static void
get_sectorsize(void)
{
	if (!user_set_sector_size) {
		int arg;
		if (ioctl(dev_fd, BLKSSZGET, &arg) == 0)
			sector_size = arg;
		if (sector_size != DEFAULT_SECTOR_SIZE)
			printf("Note: sector size is %u "
				"(not " DEFAULT_SECTOR_SIZE_STR ")\n",
				sector_size);
	}
}

static void
get_kernel_geometry(void)
{
	struct hd_geometry geometry;

	if (!ioctl(dev_fd, HDIO_GETGEO, &geometry)) {
		kern_heads = geometry.heads;
		kern_sectors = geometry.sectors;
		/* never use geometry.cylinders - it is truncated */
	}
}

static void
get_partition_table_geometry(void)
{
	const unsigned char *bufp = (const unsigned char *)MBRbuffer;
	struct partition *p;
	int i, h, s, hh, ss;
	int first = 1;
	int bad = 0;

	if (!(valid_part_table_flag((char*)bufp)))
		return;

	hh = ss = 0;
	for (i = 0; i < 4; i++) {
		p = pt_offset(bufp, i);
		if (p->sys_ind != 0) {
			h = p->end_head + 1;
			s = (p->end_sector & 077);
			if (first) {
				hh = h;
				ss = s;
				first = 0;
			} else if (hh != h || ss != s)
				bad = 1;
		}
	}

	if (!first && !bad) {
		pt_heads = hh;
		pt_sectors = ss;
	}
}

static void
get_geometry(void)
{
	int sec_fac;

	get_sectorsize();
	sec_fac = sector_size / 512;
#if ENABLE_FEATURE_SUN_LABEL
	guess_device_type();
#endif
	g_heads = g_cylinders = g_sectors = 0;
	kern_heads = kern_sectors = 0;
	pt_heads = pt_sectors = 0;

	get_kernel_geometry();
	get_partition_table_geometry();

	g_heads = user_heads ? user_heads :
		pt_heads ? pt_heads :
		kern_heads ? kern_heads : 255;
	g_sectors = user_sectors ? user_sectors :
		pt_sectors ? pt_sectors :
		kern_sectors ? kern_sectors : 63;
	total_number_of_sectors = bb_BLKGETSIZE_sectors(dev_fd);

	sector_offset = 1;
	if (dos_compatible_flag)
		sector_offset = g_sectors;

	g_cylinders = total_number_of_sectors / (g_heads * g_sectors * sec_fac);
	if (!g_cylinders)
		g_cylinders = user_cylinders;
}

/*
 * Opens disk_device and optionally reads MBR.
 *    FIXME: document what each 'what' value will do!
 * Returns:
 *   -1: no 0xaa55 flag present (possibly entire disk BSD)
 *    0: found or created label
 *    1: I/O error
 */
#if ENABLE_FEATURE_SUN_LABEL || ENABLE_FEATURE_FDISK_WRITABLE
static int get_boot(enum action what)
#else
static int get_boot(void)
#define get_boot(what) get_boot()
#endif
{
	int i, fd;

	g_partitions = 4;
	for (i = 0; i < 4; i++) {
		struct pte *pe = &ptes[i];
		pe->part_table = pt_offset(MBRbuffer, i);
		pe->ext_pointer = NULL;
		pe->offset_from_dev_start = 0;
		pe->sectorbuffer = MBRbuffer;
#if ENABLE_FEATURE_FDISK_WRITABLE
		pe->changed = (what == CREATE_EMPTY_DOS);
#endif
	}

#if ENABLE_FEATURE_FDISK_WRITABLE
// ALERT! highly idiotic design!
// We end up here when we call get_boot() recursively
// via get_boot() [table is bad] -> create_doslabel() -> get_boot(CREATE_EMPTY_DOS).
// or get_boot() [table is bad] -> create_sunlabel() -> get_boot(CREATE_EMPTY_SUN).
// (just factor out re-init of ptes[0,1,2,3] in a separate fn instead?)
// So skip opening device _again_...
	if (what == CREATE_EMPTY_DOS  IF_FEATURE_SUN_LABEL(|| what == CREATE_EMPTY_SUN))
		goto created_table;

	fd = open(disk_device, (option_mask32 & OPT_l) ? O_RDONLY : O_RDWR);

	if (fd < 0) {
		fd = open(disk_device, O_RDONLY);
		if (fd < 0) {
			if (what == TRY_ONLY)
				return 1;
			fdisk_fatal(unable_to_open);
		}
		printf("'%s' is opened for read only\n", disk_device);
	}
	xmove_fd(fd, dev_fd);
	if (512 != full_read(dev_fd, MBRbuffer, 512)) {
		if (what == TRY_ONLY) {
			close_dev_fd();
			return 1;
		}
		fdisk_fatal(unable_to_read);
	}
#else
	fd = open(disk_device, O_RDONLY);
	if (fd < 0)
		return 1;
	if (512 != full_read(fd, MBRbuffer, 512)) {
		close(fd);
		return 1;
	}
	xmove_fd(fd, dev_fd);
#endif

	get_geometry();
	update_units();

#if ENABLE_FEATURE_SUN_LABEL
	if (check_sun_label())
		return 0;
#endif
#if ENABLE_FEATURE_SGI_LABEL
	if (check_sgi_label())
		return 0;
#endif
#if ENABLE_FEATURE_AIX_LABEL
	if (check_aix_label())
		return 0;
#endif
#if ENABLE_FEATURE_OSF_LABEL
	if (check_osf_label()) {
		possibly_osf_label = 1;
		if (!valid_part_table_flag(MBRbuffer)) {
			current_label_type = LABEL_OSF;
			return 0;
		}
		printf("This disk has both DOS and BSD magic.\n"
			 "Give the 'b' command to go to BSD mode.\n");
	}
#endif

#if !ENABLE_FEATURE_FDISK_WRITABLE
	if (!valid_part_table_flag(MBRbuffer))
		return -1;
#else
	if (!valid_part_table_flag(MBRbuffer)) {
		if (what == OPEN_MAIN) {
			printf("Device contains neither a valid DOS "
				  "partition table, nor Sun, SGI or OSF "
				  "disklabel\n");
#ifdef __sparc__
			IF_FEATURE_SUN_LABEL(create_sunlabel();)
#else
			create_doslabel();
#endif
			return 0;
		}
		/* TRY_ONLY: */
		return -1;
	}
 created_table:
#endif /* FEATURE_FDISK_WRITABLE */


	IF_FEATURE_FDISK_WRITABLE(warn_cylinders();)
	warn_geometry();

	for (i = 0; i < 4; i++) {
		if (IS_EXTENDED(ptes[i].part_table->sys_ind)) {
			if (g_partitions != 4)
				printf("Ignoring extra extended "
					"partition %u\n", i + 1);
			else
				read_extended(i);
		}
	}

	for (i = 3; i < g_partitions; i++) {
		struct pte *pe = &ptes[i];
		if (!valid_part_table_flag(pe->sectorbuffer)) {
			printf("Warning: invalid flag 0x%02x,0x%02x of partition "
				"table %u will be corrected by w(rite)\n",
				pe->sectorbuffer[510],
				pe->sectorbuffer[511],
				i + 1);
			IF_FEATURE_FDISK_WRITABLE(pe->changed = 1;)
		}
	}

	return 0;
}

#if ENABLE_FEATURE_FDISK_WRITABLE
/*
 * Print the message MESG, then read an integer between LOW and HIGH (inclusive).
 * If the user hits Enter, DFLT is returned.
 * Answers like +10 are interpreted as offsets from BASE.
 *
 * There is no default if DFLT is not between LOW and HIGH.
 */
static sector_t
read_int(sector_t low, sector_t dflt, sector_t high, sector_t base, const char *mesg)
{
	sector_t value;
	int default_ok = 1;
	const char *fmt = "%s (%u-%u, default %u): ";

	if (dflt < low || dflt > high) {
		fmt = "%s (%u-%u): ";
		default_ok = 0;
	}

	while (1) {
		int use_default = default_ok;

		/* ask question and read answer */
		do {
			printf(fmt, mesg, low, high, dflt);
			read_maybe_empty("");
		} while (*line_ptr != '\n' && !isdigit(*line_ptr)
		 && *line_ptr != '-' && *line_ptr != '+');

		if (*line_ptr == '+' || *line_ptr == '-') {
			int minus = (*line_ptr == '-');
			int absolute = 0;

			value = atoi(line_ptr + 1);

			/* (1) if 2nd char is digit, use_default = 0.
			 * (2) move line_ptr to first non-digit. */
			while (isdigit(*++line_ptr))
				use_default = 0;

			switch (*line_ptr) {
			case 'c':
			case 'C':
				if (!display_in_cyl_units)
					value *= g_heads * g_sectors;
				break;
			case 'K':
				absolute = 1024;
				break;
			case 'k':
				absolute = 1000;
				break;
			case 'm':
			case 'M':
				absolute = 1000000;
				break;
			case 'g':
			case 'G':
				absolute = 1000000000;
				break;
			default:
				break;
			}
			if (absolute) {
				ullong bytes;
				unsigned long unit;

				bytes = (ullong) value * absolute;
				unit = sector_size * units_per_sector;
				bytes += unit/2; /* round */
				bytes /= unit;
				value = bytes;
			}
			if (minus)
				value = -value;
			value += base;
		} else {
			value = atoi(line_ptr);
			while (isdigit(*line_ptr)) {
				line_ptr++;
				use_default = 0;
			}
		}
		if (use_default) {
			value = dflt;
			printf("Using default value %u\n", value);
		}
		if (value >= low && value <= high)
			break;
		printf("Value is out of range\n");
	}
	return value;
}

static unsigned
get_partition(int warn, unsigned max)
{
	struct pte *pe;
	unsigned i;

	i = read_int(1, 0, max, 0, "Partition number") - 1;
	pe = &ptes[i];

	if (warn) {
		if ((!LABEL_IS_SUN && !LABEL_IS_SGI && !pe->part_table->sys_ind)
		 || (LABEL_IS_SUN && (!sunlabel->partitions[i].num_sectors || !sunlabel->infos[i].id))
		 || (LABEL_IS_SGI && !sgi_get_num_sectors(i))
		) {
			printf("Warning: partition %u has empty type\n", i+1);
		}
	}
	return i;
}

static int
get_existing_partition(int warn, unsigned max)
{
	int pno = -1;
	unsigned i;

	for (i = 0; i < max; i++) {
		struct pte *pe = &ptes[i];
		struct partition *p = pe->part_table;

		if (p && !is_cleared_partition(p)) {
			if (pno >= 0)
				goto not_unique;
			pno = i;
		}
	}
	if (pno >= 0) {
		printf("Selected partition %u\n", pno+1);
		return pno;
	}
	printf("No partition is defined yet!\n");
	return -1;

 not_unique:
	return get_partition(warn, max);
}

static int
get_nonexisting_partition(int warn, unsigned max)
{
	int pno = -1;
	unsigned i;

	for (i = 0; i < max; i++) {
		struct pte *pe = &ptes[i];
		struct partition *p = pe->part_table;

		if (p && is_cleared_partition(p)) {
			if (pno >= 0)
				goto not_unique;
			pno = i;
		}
	}
	if (pno >= 0) {
		printf("Selected partition %u\n", pno+1);
		return pno;
	}
	printf("All primary partitions have been defined already!\n");
	return -1;

 not_unique:
	return get_partition(warn, max);
}


static void
change_units(void)
{
	display_in_cyl_units = !display_in_cyl_units;
	update_units();
	printf("Changing display/entry units to %s\n",
		str_units(PLURAL));
}

static void
toggle_active(int i)
{
	struct pte *pe = &ptes[i];
	struct partition *p = pe->part_table;

	if (IS_EXTENDED(p->sys_ind) && !p->boot_ind)
		printf("WARNING: Partition %u is an extended partition\n", i + 1);
	p->boot_ind = (p->boot_ind ? 0 : ACTIVE_FLAG);
	pe->changed = 1;
}

static void
toggle_dos_compatibility_flag(void)
{
	dos_compatible_flag = 1 - dos_compatible_flag;
	if (dos_compatible_flag) {
		sector_offset = g_sectors;
		printf("DOS Compatibility flag is set\n");
	} else {
		sector_offset = 1;
		printf("DOS Compatibility flag is not set\n");
	}
}

static void
delete_partition(int i)
{
	struct pte *pe = &ptes[i];
	struct partition *p = pe->part_table;
	struct partition *q = pe->ext_pointer;

/* Note that for the fifth partition (i == 4) we don't actually
 * decrement partitions.
 */

	if (warn_geometry())
		return;         /* C/H/S not set */
	pe->changed = 1;

	if (LABEL_IS_SUN) {
		sun_delete_partition(i);
		return;
	}
	if (LABEL_IS_SGI) {
		sgi_delete_partition(i);
		return;
	}

	if (i < 4) {
		if (IS_EXTENDED(p->sys_ind) && i == ext_index) {
			g_partitions = 4;
			ptes[ext_index].ext_pointer = NULL;
			extended_offset = 0;
		}
		clear_partition(p);
		return;
	}

	if (!q->sys_ind && i > 4) {
		/* the last one in the chain - just delete */
		--g_partitions;
		--i;
		clear_partition(ptes[i].ext_pointer);
		ptes[i].changed = 1;
	} else {
		/* not the last one - further ones will be moved down */
		if (i > 4) {
			/* delete this link in the chain */
			p = ptes[i-1].ext_pointer;
			*p = *q;
			set_start_sect(p, get_start_sect(q));
			set_nr_sects(p, get_nr_sects(q));
			ptes[i-1].changed = 1;
		} else if (g_partitions > 5) {    /* 5 will be moved to 4 */
			/* the first logical in a longer chain */
			pe = &ptes[5];

			if (pe->part_table) /* prevent SEGFAULT */
				set_start_sect(pe->part_table,
						get_partition_start_from_dev_start(pe) -
						extended_offset);
			pe->offset_from_dev_start = extended_offset;
			pe->changed = 1;
		}

		if (g_partitions > 5) {
			g_partitions--;
			while (i < g_partitions) {
				ptes[i] = ptes[i+1];
				i++;
			}
		} else {
			/* the only logical: clear only */
			clear_partition(ptes[i].part_table);
		}
	}
}

static void
change_sysid(void)
{
	int i, sys, origsys;
	struct partition *p;

	/* If sgi_label then don't use get_existing_partition,
	   let the user select a partition, since get_existing_partition()
	   only works for Linux like partition tables. */
	if (!LABEL_IS_SGI) {
		i = get_existing_partition(0, g_partitions);
	} else {
		i = get_partition(0, g_partitions);
	}
	if (i == -1)
		return;
	p = ptes[i].part_table;
	origsys = sys = get_sysid(i);

	/* if changing types T to 0 is allowed, then
	   the reverse change must be allowed, too */
	if (!sys && !LABEL_IS_SGI && !LABEL_IS_SUN && !get_nr_sects(p))	{
		printf("Partition %u does not exist yet!\n", i + 1);
		return;
	}
	while (1) {
		sys = read_hex(get_sys_types());

		if (!sys && !LABEL_IS_SGI && !LABEL_IS_SUN) {
			printf("Type 0 means free space to many systems\n"
				   "(but not to Linux). Having partitions of\n"
				   "type 0 is probably unwise.\n");
			/* break; */
		}

		if (!LABEL_IS_SUN && !LABEL_IS_SGI) {
			if (IS_EXTENDED(sys) != IS_EXTENDED(p->sys_ind)) {
				printf("You cannot change a partition into"
					   " an extended one or vice versa\n");
				break;
			}
		}

		if (sys < 256) {
#if ENABLE_FEATURE_SUN_LABEL
			if (LABEL_IS_SUN && i == 2 && sys != SUN_WHOLE_DISK)
				printf("Consider leaving partition 3 "
					   "as Whole disk (5),\n"
					   "as SunOS/Solaris expects it and "
					   "even Linux likes it\n\n");
#endif
#if ENABLE_FEATURE_SGI_LABEL
			if (LABEL_IS_SGI &&
				(
					(i == 10 && sys != SGI_ENTIRE_DISK) ||
					(i == 8 && sys != 0)
				)
			) {
				printf("Consider leaving partition 9 "
					   "as volume header (0),\nand "
					   "partition 11 as entire volume (6)"
					   "as IRIX expects it\n\n");
			}
#endif
			if (sys == origsys)
				break;
			if (LABEL_IS_SUN) {
				sun_change_sysid(i, sys);
			} else if (LABEL_IS_SGI) {
				sgi_change_sysid(i, sys);
			} else
				p->sys_ind = sys;

			printf("Changed system type of partition %u "
				"to %x (%s)\n", i + 1, sys,
				partition_type(sys));
			ptes[i].changed = 1;
			//if (is_dos_partition(origsys) || is_dos_partition(sys))
			//	dos_changed = 1;
			break;
		}
	}
}
#endif /* FEATURE_FDISK_WRITABLE */


/* check_consistency() and linear2chs() added Sat Mar 6 12:28:16 1993,
 * faith@cs.unc.edu, based on code fragments from pfdisk by Gordon W. Ross,
 * Jan.  1990 (version 1.2.1 by Gordon W. Ross Aug. 1990; Modified by S.
 * Lubkin Oct.  1991). */

static void
linear2chs(unsigned ls, unsigned *c, unsigned *h, unsigned *s)
{
	int spc = g_heads * g_sectors;

	*c = ls / spc;
	ls = ls % spc;
	*h = ls / g_sectors;
	*s = ls % g_sectors + 1;  /* sectors count from 1 */
}

static void
check_consistency(const struct partition *p, int partition)
{
	unsigned pbc, pbh, pbs;          /* physical beginning c, h, s */
	unsigned pec, peh, pes;          /* physical ending c, h, s */
	unsigned lbc, lbh, lbs;          /* logical beginning c, h, s */
	unsigned lec, leh, les;          /* logical ending c, h, s */

	if (!g_heads || !g_sectors || (partition >= 4))
		return;         /* do not check extended partitions */

/* physical beginning c, h, s */
	pbc = (p->cyl & 0xff) | ((p->sector << 2) & 0x300);
	pbh = p->head;
	pbs = p->sector & 0x3f;

/* physical ending c, h, s */
	pec = (p->end_cyl & 0xff) | ((p->end_sector << 2) & 0x300);
	peh = p->end_head;
	pes = p->end_sector & 0x3f;

/* compute logical beginning (c, h, s) */
	linear2chs(get_start_sect(p), &lbc, &lbh, &lbs);

/* compute logical ending (c, h, s) */
	linear2chs(get_start_sect(p) + get_nr_sects(p) - 1, &lec, &leh, &les);

/* Same physical / logical beginning? */
	if (g_cylinders <= 1024 && (pbc != lbc || pbh != lbh || pbs != lbs)) {
		printf("Partition %u has different physical/logical "
			"beginnings (non-Linux?):\n", partition + 1);
		printf("     phys=(%u, %u, %u) ", pbc, pbh, pbs);
		printf("logical=(%u, %u, %u)\n", lbc, lbh, lbs);
	}

/* Same physical / logical ending? */
	if (g_cylinders <= 1024 && (pec != lec || peh != leh || pes != les)) {
		printf("Partition %u has different physical/logical "
			"endings:\n", partition + 1);
		printf("     phys=(%u, %u, %u) ", pec, peh, pes);
		printf("logical=(%u, %u, %u)\n", lec, leh, les);
	}

/* Ending on cylinder boundary? */
	if (peh != (g_heads - 1) || pes != g_sectors) {
		printf("Partition %u does not end on cylinder boundary\n",
			partition + 1);
	}
}

static void
list_disk_geometry(void)
{
	ullong bytes = ((ullong)total_number_of_sectors << 9);
	long megabytes = bytes / 1000000;

	if (megabytes < 10000)
		printf("\nDisk %s: %lu MB, %llu bytes\n",
			disk_device, megabytes, bytes);
	else
		printf("\nDisk %s: %lu.%lu GB, %llu bytes\n",
			disk_device, megabytes/1000, (megabytes/100)%10, bytes);
	printf("%u heads, %u sectors/track, %u cylinders",
		   g_heads, g_sectors, g_cylinders);
	if (units_per_sector == 1)
		printf(", total %"SECT_FMT"u sectors",
			total_number_of_sectors / (sector_size/512));
	printf("\nUnits = %s of %u * %u = %u bytes\n\n",
		str_units(PLURAL),
		units_per_sector, sector_size, units_per_sector * sector_size);
}

/*
 * Check whether partition entries are ordered by their starting positions.
 * Return 0 if OK. Return i if partition i should have been earlier.
 * Two separate checks: primary and logical partitions.
 */
static int
wrong_p_order(int *prev)
{
	const struct pte *pe;
	const struct partition *p;
	sector_t last_p_start_pos = 0, p_start_pos;
	unsigned i, last_i = 0;

	for (i = 0; i < g_partitions; i++) {
		if (i == 4) {
			last_i = 4;
			last_p_start_pos = 0;
		}
		pe = &ptes[i];
		p = pe->part_table;
		if (p->sys_ind) {
			p_start_pos = get_partition_start_from_dev_start(pe);

			if (last_p_start_pos > p_start_pos) {
				if (prev)
					*prev = last_i;
				return i;
			}

			last_p_start_pos = p_start_pos;
			last_i = i;
		}
	}
	return 0;
}

#if ENABLE_FEATURE_FDISK_ADVANCED
/*
 * Fix the chain of logicals.
 * extended_offset is unchanged, the set of sectors used is unchanged
 * The chain is sorted so that sectors increase, and so that
 * starting sectors increase.
 *
 * After this it may still be that cfdisk doesnt like the table.
 * (This is because cfdisk considers expanded parts, from link to
 * end of partition, and these may still overlap.)
 * Now
 *   sfdisk /dev/hda > ohda; sfdisk /dev/hda < ohda
 * may help.
 */
static void
fix_chain_of_logicals(void)
{
	int j, oj, ojj, sj, sjj;
	struct partition *pj,*pjj,tmp;

	/* Stage 1: sort sectors but leave sector of part 4 */
	/* (Its sector is the global extended_offset.) */
 stage1:
	for (j = 5; j < g_partitions - 1; j++) {
		oj = ptes[j].offset_from_dev_start;
		ojj = ptes[j+1].offset_from_dev_start;
		if (oj > ojj) {
			ptes[j].offset_from_dev_start = ojj;
			ptes[j+1].offset_from_dev_start = oj;
			pj = ptes[j].part_table;
			set_start_sect(pj, get_start_sect(pj)+oj-ojj);
			pjj = ptes[j+1].part_table;
			set_start_sect(pjj, get_start_sect(pjj)+ojj-oj);
			set_start_sect(ptes[j-1].ext_pointer,
					   ojj-extended_offset);
			set_start_sect(ptes[j].ext_pointer,
					   oj-extended_offset);
			goto stage1;
		}
	}

	/* Stage 2: sort starting sectors */
 stage2:
	for (j = 4; j < g_partitions - 1; j++) {
		pj = ptes[j].part_table;
		pjj = ptes[j+1].part_table;
		sj = get_start_sect(pj);
		sjj = get_start_sect(pjj);
		oj = ptes[j].offset_from_dev_start;
		ojj = ptes[j+1].offset_from_dev_start;
		if (oj+sj > ojj+sjj) {
			tmp = *pj;
			*pj = *pjj;
			*pjj = tmp;
			set_start_sect(pj, ojj+sjj-oj);
			set_start_sect(pjj, oj+sj-ojj);
			goto stage2;
		}
	}

	/* Probably something was changed */
	for (j = 4; j < g_partitions; j++)
		ptes[j].changed = 1;
}


static void
fix_partition_table_order(void)
{
	struct pte *pei, *pek;
	int i,k;

	if (!wrong_p_order(NULL)) {
		printf("Ordering is already correct\n\n");
		return;
	}

	while ((i = wrong_p_order(&k)) != 0 && i < 4) {
		/* partition i should have come earlier, move it */
		/* We have to move data in the MBR */
		struct partition *pi, *pk, *pe, pbuf;
		pei = &ptes[i];
		pek = &ptes[k];

		pe = pei->ext_pointer;
		pei->ext_pointer = pek->ext_pointer;
		pek->ext_pointer = pe;

		pi = pei->part_table;
		pk = pek->part_table;

		memmove(&pbuf, pi, sizeof(struct partition));
		memmove(pi, pk, sizeof(struct partition));
		memmove(pk, &pbuf, sizeof(struct partition));

		pei->changed = pek->changed = 1;
	}

	if (i)
		fix_chain_of_logicals();

	printf("Done.\n");

}
#endif

static void
list_table(int xtra)
{
	const struct partition *p;
	int i, w;

	if (LABEL_IS_SUN) {
		sun_list_table(xtra);
		return;
	}
	if (LABEL_IS_SUN) {
		sgi_list_table(xtra);
		return;
	}

	list_disk_geometry();

	if (LABEL_IS_OSF) {
		xbsd_print_disklabel(xtra);
		return;
	}

	/* Heuristic: we list partition 3 of /dev/foo as /dev/foo3,
	   but if the device name ends in a digit, say /dev/foo1,
	   then the partition is called /dev/foo1p3. */
	w = strlen(disk_device);
	if (w && isdigit(disk_device[w-1]))
		w++;
	if (w < 5)
		w = 5;

	//            1 12345678901 12345678901 12345678901  12
	printf("%*s Boot      Start         End      Blocks  Id System\n",
		   w+1, "Device");

	for (i = 0; i < g_partitions; i++) {
		const struct pte *pe = &ptes[i];
		sector_t psects;
		sector_t pblocks;
		unsigned podd;

		p = pe->part_table;
		if (!p || is_cleared_partition(p))
			continue;

		psects = get_nr_sects(p);
		pblocks = psects;
		podd = 0;

		if (sector_size < 1024) {
			pblocks /= (1024 / sector_size);
			podd = psects % (1024 / sector_size);
		}
		if (sector_size > 1024)
			pblocks *= (sector_size / 1024);

		printf("%s  %c %11"SECT_FMT"u %11"SECT_FMT"u %11"SECT_FMT"u%c %2x %s\n",
			partname(disk_device, i+1, w+2),
			!p->boot_ind ? ' ' : p->boot_ind == ACTIVE_FLAG /* boot flag */
				? '*' : '?',
			cround(get_partition_start_from_dev_start(pe)),           /* start */
			cround(get_partition_start_from_dev_start(pe) + psects    /* end */
				- (psects ? 1 : 0)),
			pblocks, podd ? '+' : ' ', /* odd flag on end */
			p->sys_ind,                                     /* type id */
			partition_type(p->sys_ind));                    /* type name */

		check_consistency(p, i);
	}

	/* Is partition table in disk order? It need not be, but... */
	/* partition table entries are not checked for correct order
	 * if this is a sgi, sun or aix labeled disk... */
	if (LABEL_IS_DOS && wrong_p_order(NULL)) {
		/* FIXME */
		printf("\nPartition table entries are not in disk order\n");
	}
}

#if ENABLE_FEATURE_FDISK_ADVANCED
static void
x_list_table(int extend)
{
	const struct pte *pe;
	const struct partition *p;
	int i;

	printf("\nDisk %s: %u heads, %u sectors, %u cylinders\n\n",
		disk_device, g_heads, g_sectors, g_cylinders);
	printf("Nr AF  Hd Sec  Cyl  Hd Sec  Cyl      Start       Size ID\n");
	for (i = 0; i < g_partitions; i++) {
		pe = &ptes[i];
		p = (extend ? pe->ext_pointer : pe->part_table);
		if (p != NULL) {
			printf("%2u %02x%4u%4u%5u%4u%4u%5u%11"SECT_FMT"u%11"SECT_FMT"u %02x\n",
				i + 1, p->boot_ind, p->head,
				sector(p->sector),
				cylinder(p->sector, p->cyl), p->end_head,
				sector(p->end_sector),
				cylinder(p->end_sector, p->end_cyl),
				get_start_sect(p), get_nr_sects(p),
				p->sys_ind);
			if (p->sys_ind)
				check_consistency(p, i);
		}
	}
}
#endif

#if ENABLE_FEATURE_FDISK_WRITABLE
static void
fill_bounds(sector_t *first, sector_t *last)
{
	unsigned i;
	const struct pte *pe = &ptes[0];
	const struct partition *p;

	for (i = 0; i < g_partitions; pe++,i++) {
		p = pe->part_table;
		if (!p->sys_ind || IS_EXTENDED(p->sys_ind)) {
			first[i] = 0xffffffff;
			last[i] = 0;
		} else {
			first[i] = get_partition_start_from_dev_start(pe);
			last[i] = first[i] + get_nr_sects(p) - 1;
		}
	}
}

static void
check(int n, unsigned h, unsigned s, unsigned c, sector_t start)
{
	sector_t total, real_s, real_c;

	real_s = sector(s) - 1;
	real_c = cylinder(s, c);
	total = (real_c * g_sectors + real_s) * g_heads + h;
	if (!total)
		printf("Partition %u contains sector 0\n", n);
	if (h >= g_heads)
		printf("Partition %u: head %u greater than maximum %u\n",
			n, h + 1, g_heads);
	if (real_s >= g_sectors)
		printf("Partition %u: sector %u greater than "
			"maximum %u\n", n, s, g_sectors);
	if (real_c >= g_cylinders)
		printf("Partition %u: cylinder %"SECT_FMT"u greater than "
			"maximum %u\n", n, real_c + 1, g_cylinders);
	if (g_cylinders <= 1024 && start != total)
		printf("Partition %u: previous sectors %"SECT_FMT"u disagrees with "
			"total %"SECT_FMT"u\n", n, start, total);
}

static void
verify(void)
{
	int i, j;
	sector_t total = 1;
	sector_t first[g_partitions], last[g_partitions];
	struct partition *p;

	if (warn_geometry())
		return;

	if (LABEL_IS_SUN) {
		verify_sun();
		return;
	}
	if (LABEL_IS_SGI) {
		verify_sgi(1);
		return;
	}

	fill_bounds(first, last);
	for (i = 0; i < g_partitions; i++) {
		struct pte *pe = &ptes[i];

		p = pe->part_table;
		if (p->sys_ind && !IS_EXTENDED(p->sys_ind)) {
			check_consistency(p, i);
			if (get_partition_start_from_dev_start(pe) < first[i])
				printf("Warning: bad start-of-data in "
					"partition %u\n", i + 1);
			check(i + 1, p->end_head, p->end_sector, p->end_cyl,
				last[i]);
			total += last[i] + 1 - first[i];
			for (j = 0; j < i; j++) {
				if ((first[i] >= first[j] && first[i] <= last[j])
				 || ((last[i] <= last[j] && last[i] >= first[j]))) {
					printf("Warning: partition %u overlaps "
						"partition %u\n", j + 1, i + 1);
					total += first[i] >= first[j] ?
						first[i] : first[j];
					total -= last[i] <= last[j] ?
						last[i] : last[j];
				}
			}
		}
	}

	if (extended_offset) {
		struct pte *pex = &ptes[ext_index];
		sector_t e_last = get_start_sect(pex->part_table) +
			get_nr_sects(pex->part_table) - 1;

		for (i = 4; i < g_partitions; i++) {
			total++;
			p = ptes[i].part_table;
			if (!p->sys_ind) {
				if (i != 4 || i + 1 < g_partitions)
					printf("Warning: partition %u "
						"is empty\n", i + 1);
			} else if (first[i] < extended_offset || last[i] > e_last) {
				printf("Logical partition %u not entirely in "
					"partition %u\n", i + 1, ext_index + 1);
			}
		}
	}

	if (total > g_heads * g_sectors * g_cylinders)
		printf("Total allocated sectors %u greater than the maximum "
			"%u\n", total, g_heads * g_sectors * g_cylinders);
	else {
		total = g_heads * g_sectors * g_cylinders - total;
		if (total != 0)
			printf("%"SECT_FMT"u unallocated sectors\n", total);
	}
}

static void
add_partition(int n, int sys)
{
	char mesg[256];         /* 48 does not suffice in Japanese */
	int i, num_read = 0;
	struct partition *p = ptes[n].part_table;
	struct partition *q = ptes[ext_index].part_table;
	sector_t limit, temp;
	sector_t start, stop = 0;
	sector_t first[g_partitions], last[g_partitions];

	if (p && p->sys_ind) {
		printf(msg_part_already_defined, n + 1);
		return;
	}
	fill_bounds(first, last);
	if (n < 4) {
		start = sector_offset;
		if (display_in_cyl_units || !total_number_of_sectors)
			limit = (sector_t) g_heads * g_sectors * g_cylinders - 1;
		else
			limit = total_number_of_sectors - 1;
		if (extended_offset) {
			first[ext_index] = extended_offset;
			last[ext_index] = get_start_sect(q) +
				get_nr_sects(q) - 1;
		}
	} else {
		start = extended_offset + sector_offset;
		limit = get_start_sect(q) + get_nr_sects(q) - 1;
	}
	if (display_in_cyl_units)
		for (i = 0; i < g_partitions; i++)
			first[i] = (cround(first[i]) - 1) * units_per_sector;

	snprintf(mesg, sizeof(mesg), "First %s", str_units(SINGULAR));
	do {
		temp = start;
		for (i = 0; i < g_partitions; i++) {
			int lastplusoff;

			if (start == ptes[i].offset_from_dev_start)
				start += sector_offset;
			lastplusoff = last[i] + ((n < 4) ? 0 : sector_offset);
			if (start >= first[i] && start <= lastplusoff)
				start = lastplusoff + 1;
		}
		if (start > limit)
			break;
		if (start >= temp+units_per_sector && num_read) {
			printf("Sector %"SECT_FMT"u is already allocated\n", temp);
			temp = start;
			num_read = 0;
		}
		if (!num_read && start == temp) {
			sector_t saved_start;

			saved_start = start;
			start = read_int(cround(saved_start), cround(saved_start), cround(limit), 0, mesg);
			if (display_in_cyl_units) {
				start = (start - 1) * units_per_sector;
				if (start < saved_start)
					start = saved_start;
			}
			num_read = 1;
		}
	} while (start != temp || !num_read);
	if (n > 4) {                    /* NOT for fifth partition */
		struct pte *pe = &ptes[n];

		pe->offset_from_dev_start = start - sector_offset;
		if (pe->offset_from_dev_start == extended_offset) { /* must be corrected */
			pe->offset_from_dev_start++;
			if (sector_offset == 1)
				start++;
		}
	}

	for (i = 0; i < g_partitions; i++) {
		struct pte *pe = &ptes[i];

		if (start < pe->offset_from_dev_start && limit >= pe->offset_from_dev_start)
			limit = pe->offset_from_dev_start - 1;
		if (start < first[i] && limit >= first[i])
			limit = first[i] - 1;
	}
	if (start > limit) {
		printf("No free sectors available\n");
		if (n > 4)
			g_partitions--;
		return;
	}
	if (cround(start) == cround(limit)) {
		stop = limit;
	} else {
		snprintf(mesg, sizeof(mesg),
			 "Last %s or +size or +sizeM or +sizeK",
			 str_units(SINGULAR));
		stop = read_int(cround(start), cround(limit), cround(limit), cround(start), mesg);
		if (display_in_cyl_units) {
			stop = stop * units_per_sector - 1;
			if (stop >limit)
				stop = limit;
		}
	}

	set_partition(n, 0, start, stop, sys);
	if (n > 4)
		set_partition(n - 1, 1, ptes[n].offset_from_dev_start, stop, EXTENDED);

	if (IS_EXTENDED(sys)) {
		struct pte *pe4 = &ptes[4];
		struct pte *pen = &ptes[n];

		ext_index = n;
		pen->ext_pointer = p;
		pe4->offset_from_dev_start = extended_offset = start;
		pe4->sectorbuffer = xzalloc(sector_size);
		pe4->part_table = pt_offset(pe4->sectorbuffer, 0);
		pe4->ext_pointer = pe4->part_table + 1;
		pe4->changed = 1;
		g_partitions = 5;
	}
}

static void
add_logical(void)
{
	if (g_partitions > 5 || ptes[4].part_table->sys_ind) {
		struct pte *pe = &ptes[g_partitions];

		pe->sectorbuffer = xzalloc(sector_size);
		pe->part_table = pt_offset(pe->sectorbuffer, 0);
		pe->ext_pointer = pe->part_table + 1;
		pe->offset_from_dev_start = 0;
		pe->changed = 1;
		g_partitions++;
	}
	add_partition(g_partitions - 1, LINUX_NATIVE);
}

static void
new_partition(void)
{
	int i, free_primary = 0;

	if (warn_geometry())
		return;

	if (LABEL_IS_SUN) {
		add_sun_partition(get_partition(0, g_partitions), LINUX_NATIVE);
		return;
	}
	if (LABEL_IS_SGI) {
		sgi_add_partition(get_partition(0, g_partitions), LINUX_NATIVE);
		return;
	}
	if (LABEL_IS_AIX) {
		printf("Sorry - this fdisk cannot handle AIX disk labels.\n"
"If you want to add DOS-type partitions, create a new empty DOS partition\n"
"table first (use 'o'). This will destroy the present disk contents.\n");
		return;
	}

	for (i = 0; i < 4; i++)
		free_primary += !ptes[i].part_table->sys_ind;

	if (!free_primary && g_partitions >= MAXIMUM_PARTS) {
		printf("The maximum number of partitions has been created\n");
		return;
	}

	if (!free_primary) {
		if (extended_offset)
			add_logical();
		else
			printf("You must delete some partition and add "
				 "an extended partition first\n");
	} else {
		char c, line[80];
		snprintf(line, sizeof(line),
			"Command action\n"
			"   %s\n"
			"   p   primary partition (1-4)\n",
			(extended_offset ?
			"l   logical (5 or over)" : "e   extended"));
		while (1) {
			c = read_nonempty(line);
			if ((c | 0x20) == 'p') {
				i = get_nonexisting_partition(0, 4);
				if (i >= 0)
					add_partition(i, LINUX_NATIVE);
				return;
			}
			if (c == 'l' && extended_offset) {
				add_logical();
				return;
			}
			if (c == 'e' && !extended_offset) {
				i = get_nonexisting_partition(0, 4);
				if (i >= 0)
					add_partition(i, EXTENDED);
				return;
			}
			printf("Invalid partition number "
					 "for type '%c'\n", c);
		}
	}
}

static void
write_table(void)
{
	int i;

	if (LABEL_IS_DOS) {
		for (i = 0; i < 3; i++)
			if (ptes[i].changed)
				ptes[3].changed = 1;
		for (i = 3; i < g_partitions; i++) {
			struct pte *pe = &ptes[i];

			if (pe->changed) {
				write_part_table_flag(pe->sectorbuffer);
				write_sector(pe->offset_from_dev_start, pe->sectorbuffer);
			}
		}
	}
	else if (LABEL_IS_SGI) {
		/* no test on change? the printf below might be mistaken */
		sgi_write_table();
	}
	else if (LABEL_IS_SUN) {
		int needw = 0;

		for (i = 0; i < 8; i++)
			if (ptes[i].changed)
				needw = 1;
		if (needw)
			sun_write_table();
	}

	printf("The partition table has been altered!\n\n");
	reread_partition_table(1);
}

static void
reread_partition_table(int leave)
{
	int i;

	printf("Calling ioctl() to re-read partition table\n");
	sync();
	/* sleep(2); Huh? */
	i = ioctl_or_perror(dev_fd, BLKRRPART, NULL,
			"WARNING: rereading partition table "
			"failed, kernel still uses old table");
#if 0
	if (dos_changed)
		printf(
		"\nWARNING: If you have created or modified any DOS 6.x\n"
		"partitions, please see the fdisk manual page for additional\n"
		"information\n");
#endif

	if (leave) {
		if (ENABLE_FEATURE_CLEAN_UP)
			close_dev_fd();
		exit(i != 0);
	}
}
#endif /* FEATURE_FDISK_WRITABLE */

#if ENABLE_FEATURE_FDISK_ADVANCED
#define MAX_PER_LINE    16
static void
print_buffer(char *pbuffer)
{
	int i,l;

	for (i = 0, l = 0; i < sector_size; i++, l++) {
		if (l == 0)
			printf("0x%03X:", i);
		printf(" %02X", (unsigned char) pbuffer[i]);
		if (l == MAX_PER_LINE - 1) {
			bb_putchar('\n');
			l = -1;
		}
	}
	if (l > 0)
		bb_putchar('\n');
	bb_putchar('\n');
}

static void
print_raw(void)
{
	int i;

	printf("Device: %s\n", disk_device);
	if (LABEL_IS_SGI || LABEL_IS_SUN)
		print_buffer(MBRbuffer);
	else {
		for (i = 3; i < g_partitions; i++)
			print_buffer(ptes[i].sectorbuffer);
	}
}

static void
move_begin(unsigned i)
{
	struct pte *pe = &ptes[i];
	struct partition *p = pe->part_table;
	sector_t new, first, nr_sects;

	if (warn_geometry())
		return;
	nr_sects = get_nr_sects(p);
	if (!p->sys_ind || !nr_sects || IS_EXTENDED(p->sys_ind)) {
		printf("Partition %u has no data area\n", i + 1);
		return;
	}
	first = get_partition_start_from_dev_start(pe);
	/* == pe->offset_from_dev_start + get_start_sect(p) */
	new = read_int(0 /*was:first*/, first, first + nr_sects - 1, first, "New beginning of data");
	if (new != first) {
		sector_t new_relative = new - pe->offset_from_dev_start;
		nr_sects += (get_start_sect(p) - new_relative);
		set_start_sect(p, new_relative);
		set_nr_sects(p, nr_sects);
		read_nonempty("Recalculate C/H/S values? (Y/N): ");
		if ((line_ptr[0] | 0x20) == 'y')
			set_hsc_start_end(p, new, new + nr_sects - 1);
		pe->changed = 1;
	}
}

static void
xselect(void)
{
	char c;

	while (1) {
		bb_putchar('\n');
		c = 0x20 | read_nonempty("Expert command (m for help): ");
		switch (c) {
		case 'a':
			if (LABEL_IS_SUN)
				sun_set_alt_cyl();
			break;
		case 'b':
			if (LABEL_IS_DOS)
				move_begin(get_partition(0, g_partitions));
			break;
		case 'c':
			user_cylinders = g_cylinders =
				read_int(1, g_cylinders, 1048576, 0,
					"Number of cylinders");
			if (LABEL_IS_SUN)
				sun_set_ncyl(g_cylinders);
			if (LABEL_IS_DOS)
				warn_cylinders();
			break;
		case 'd':
			print_raw();
			break;
		case 'e':
			if (LABEL_IS_SGI)
				sgi_set_xcyl();
			else if (LABEL_IS_SUN)
				sun_set_xcyl();
			else if (LABEL_IS_DOS)
				x_list_table(1);
			break;
		case 'f':
			if (LABEL_IS_DOS)
				fix_partition_table_order();
			break;
		case 'g':
#if ENABLE_FEATURE_SGI_LABEL
			create_sgilabel();
#endif
			break;
		case 'h':
			user_heads = g_heads = read_int(1, g_heads, 256, 0, "Number of heads");
			update_units();
			break;
		case 'i':
			if (LABEL_IS_SUN)
				sun_set_ilfact();
			break;
		case 'o':
			if (LABEL_IS_SUN)
				sun_set_rspeed();
			break;
		case 'p':
			if (LABEL_IS_SUN)
				list_table(1);
			else
				x_list_table(0);
			break;
		case 'q':
			if (ENABLE_FEATURE_CLEAN_UP)
				close_dev_fd();
			bb_putchar('\n');
			exit(EXIT_SUCCESS);
		case 'r':
			return;
		case 's':
			user_sectors = g_sectors = read_int(1, g_sectors, 63, 0, "Number of sectors");
			if (dos_compatible_flag) {
				sector_offset = g_sectors;
				printf("Warning: setting sector offset for DOS "
					"compatiblity\n");
			}
			update_units();
			break;
		case 'v':
			verify();
			break;
		case 'w':
			write_table();  /* does not return */
			break;
		case 'y':
			if (LABEL_IS_SUN)
				sun_set_pcylcount();
			break;
		default:
			xmenu();
		}
	}
}
#endif /* ADVANCED mode */

static int
is_ide_cdrom_or_tape(const char *device)
{
	FILE *procf;
	char buf[100];
	struct stat statbuf;
	int is_ide = 0;

	/* No device was given explicitly, and we are trying some
	   likely things.  But opening /dev/hdc may produce errors like
	   "hdc: tray open or drive not ready"
	   if it happens to be a CD-ROM drive. It even happens that
	   the process hangs on the attempt to read a music CD.
	   So try to be careful. This only works since 2.1.73. */

	if (strncmp("/dev/hd", device, 7))
		return 0;

	snprintf(buf, sizeof(buf), "/proc/ide/%s/media", device+5);
	procf = fopen_for_read(buf);
	if (procf != NULL && fgets(buf, sizeof(buf), procf))
		is_ide = (!strncmp(buf, "cdrom", 5) ||
			  !strncmp(buf, "tape", 4));
	else
		/* Now when this proc file does not exist, skip the
		   device when it is read-only. */
		if (stat(device, &statbuf) == 0)
			is_ide = ((statbuf.st_mode & 0222) == 0);

	if (procf)
		fclose(procf);
	return is_ide;
}


static void
open_list_and_close(const char *device, int user_specified)
{
	int gb;

	disk_device = device;
	if (setjmp(listingbuf))
		return;
	if (!user_specified)
		if (is_ide_cdrom_or_tape(device))
			return;

	/* Open disk_device, save file descriptor to dev_fd */
	errno = 0;
	gb = get_boot(TRY_ONLY);
	if (gb > 0) {   /* I/O error */
		/* Ignore other errors, since we try IDE
		   and SCSI hard disks which may not be
		   installed on the system. */
		if (user_specified || errno == EACCES)
			bb_perror_msg("can't open '%s'", device);
		return;
	}

	if (gb < 0) { /* no DOS signature */
		list_disk_geometry();
		if (LABEL_IS_AIX)
			goto ret;
#if ENABLE_FEATURE_OSF_LABEL
		if (bsd_trydev(device) < 0)
#endif
			printf("Disk %s doesn't contain a valid "
				"partition table\n", device);
	} else {
		list_table(0);
#if ENABLE_FEATURE_FDISK_WRITABLE
		if (!LABEL_IS_SUN && g_partitions > 4) {
			delete_partition(ext_index);
		}
#endif
	}
 ret:
	close_dev_fd();
}

/* for fdisk -l: try all things in /proc/partitions
   that look like a partition name (do not end in a digit) */
static void
list_devs_in_proc_partititons(void)
{
	FILE *procpt;
	char line[100], ptname[100], devname[120], *s;
	int ma, mi, sz;

	procpt = fopen_or_warn("/proc/partitions", "r");

	while (fgets(line, sizeof(line), procpt)) {
		if (sscanf(line, " %u %u %u %[^\n ]",
				&ma, &mi, &sz, ptname) != 4)
			continue;
		for (s = ptname; *s; s++)
    			continue;
		/* note: excluding '0': e.g. mmcblk0 is not a partition name! */
		if (s[-1] >= '1' && s[-1] <= '9')
			continue;
		sprintf(devname, "/dev/%s", ptname);
		open_list_and_close(devname, 0);
	}
#if ENABLE_FEATURE_CLEAN_UP
	fclose(procpt);
#endif
}

#if ENABLE_FEATURE_FDISK_WRITABLE
static void
unknown_command(int c)
{
	printf("%c: unknown command\n", c);
}
#endif

int fdisk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fdisk_main(int argc UNUSED_PARAM, char **argv)
{
	unsigned opt;
	/*
	 *  fdisk -v
	 *  fdisk -l [-b sectorsize] [-u] device ...
	 *  fdisk -s [partition] ...
	 *  fdisk [-b sectorsize] [-u] device
	 *
	 * Options -C, -H, -S set the geometry.
	 */
	INIT_G();

	close_dev_fd(); /* needed: fd 3 must not stay closed */

	opt_complementary = "b+:C+:H+:S+"; /* numeric params */
	opt = getopt32(argv, "b:C:H:lS:u" IF_FEATURE_FDISK_BLKSIZE("s"),
				&sector_size, &user_cylinders, &user_heads, &user_sectors);
	argv += optind;
	if (opt & OPT_b) {
		/* Ugly: this sector size is really per device,
		 * so cannot be combined with multiple disks,
		 * and the same goes for the C/H/S options.
		 */
		if (sector_size < 512
		 || sector_size > 0x10000
		 || (sector_size & (sector_size-1)) /* not power of 2 */
		) {
			bb_show_usage();
		}
		sector_offset = 2;
		user_set_sector_size = 1;
	}
	if (user_heads <= 0 || user_heads >= 256)
		user_heads = 0;
	if (user_sectors <= 0 || user_sectors >= 64)
		user_sectors = 0;
	if (opt & OPT_u)
		display_in_cyl_units = 0; // -u

#if ENABLE_FEATURE_FDISK_WRITABLE
	if (opt & OPT_l) {
		nowarn = 1;
#endif
		if (*argv) {
			listing = 1;
			do {
				open_list_and_close(*argv, 1);
			} while (*++argv);
		} else {
			/* we don't have device names, */
			/* use /proc/partitions instead */
			list_devs_in_proc_partititons();
		}
		return 0;
#if ENABLE_FEATURE_FDISK_WRITABLE
	}
#endif

#if ENABLE_FEATURE_FDISK_BLKSIZE
	if (opt & OPT_s) {
		int j;

		nowarn = 1;
		if (!argv[0])
			bb_show_usage();
		for (j = 0; argv[j]; j++) {
			unsigned long long size;
			fd = xopen(argv[j], O_RDONLY);
			size = bb_BLKGETSIZE_sectors(fd) / 2;
			close(fd);
			if (argv[1])
				printf("%llu\n", size);
			else
				printf("%s: %llu\n", argv[j], size);
		}
		return 0;
	}
#endif

#if ENABLE_FEATURE_FDISK_WRITABLE
	if (!argv[0] || argv[1])
		bb_show_usage();

	disk_device = argv[0];
	get_boot(OPEN_MAIN);

	if (LABEL_IS_OSF) {
		/* OSF label, and no DOS label */
		printf("Detected an OSF/1 disklabel on %s, entering "
			"disklabel mode\n", disk_device);
		bsd_select();
		/*Why do we do this?  It seems to be counter-intuitive*/
		current_label_type = LABEL_DOS;
		/* If we return we may want to make an empty DOS label? */
	}

	while (1) {
		int c;
		bb_putchar('\n');
		c = 0x20 | read_nonempty("Command (m for help): ");
		switch (c) {
		case 'a':
			if (LABEL_IS_DOS)
				toggle_active(get_partition(1, g_partitions));
			else if (LABEL_IS_SUN)
				toggle_sunflags(get_partition(1, g_partitions),
						0x01);
			else if (LABEL_IS_SGI)
				sgi_set_bootpartition(
					get_partition(1, g_partitions));
			else
				unknown_command(c);
			break;
		case 'b':
			if (LABEL_IS_SGI) {
				printf("\nThe current boot file is: %s\n",
					sgi_get_bootfile());
				if (read_maybe_empty("Please enter the name of the "
						   "new boot file: ") == '\n')
					printf("Boot file unchanged\n");
				else
					sgi_set_bootfile(line_ptr);
			}
#if ENABLE_FEATURE_OSF_LABEL
			else
				bsd_select();
#endif
			break;
		case 'c':
			if (LABEL_IS_DOS)
				toggle_dos_compatibility_flag();
			else if (LABEL_IS_SUN)
				toggle_sunflags(get_partition(1, g_partitions),
						0x10);
			else if (LABEL_IS_SGI)
				sgi_set_swappartition(
						get_partition(1, g_partitions));
			else
				unknown_command(c);
			break;
		case 'd':
			{
				int j;
			/* If sgi_label then don't use get_existing_partition,
			   let the user select a partition, since
			   get_existing_partition() only works for Linux-like
			   partition tables */
				if (!LABEL_IS_SGI) {
					j = get_existing_partition(1, g_partitions);
				} else {
					j = get_partition(1, g_partitions);
				}
				if (j >= 0)
					delete_partition(j);
			}
			break;
		case 'i':
			if (LABEL_IS_SGI)
				create_sgiinfo();
			else
				unknown_command(c);
		case 'l':
			list_types(get_sys_types());
			break;
		case 'm':
			menu();
			break;
		case 'n':
			new_partition();
			break;
		case 'o':
			create_doslabel();
			break;
		case 'p':
			list_table(0);
			break;
		case 'q':
			if (ENABLE_FEATURE_CLEAN_UP)
				close_dev_fd();
			bb_putchar('\n');
			return 0;
		case 's':
#if ENABLE_FEATURE_SUN_LABEL
			create_sunlabel();
#endif
			break;
		case 't':
			change_sysid();
			break;
		case 'u':
			change_units();
			break;
		case 'v':
			verify();
			break;
		case 'w':
			write_table();          /* does not return */
			break;
#if ENABLE_FEATURE_FDISK_ADVANCED
		case 'x':
			if (LABEL_IS_SGI) {
				printf("\n\tSorry, no experts menu for SGI "
					"partition tables available\n\n");
			} else
				xselect();
			break;
#endif
		default:
			unknown_command(c);
			menu();
		}
	}
	return 0;
#endif /* FEATURE_FDISK_WRITABLE */
}