summaryrefslogtreecommitdiff
path: root/libbb/lineedit.c
blob: 56e81404e0e032b1e53852dc4ddaacd622ec410a (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
/* vi: set sw=4 ts=4: */
/*
 * Command line editing.
 *
 * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
 * Written by:   Vladimir Oleynik <dzo@simtreas.ru>
 *
 * Used ideas:
 *      Adam Rogoyski    <rogoyski@cs.utexas.edu>
 *      Dave Cinege      <dcinege@psychosis.com>
 *      Jakub Jelinek (c) 1995
 *      Erik Andersen    <andersen@codepoet.org> (Majorly adjusted for busybox)
 *
 * This code is 'as is' with no warranty.
 */
/*
 * Usage and known bugs:
 * Terminal key codes are not extensive, more needs to be added.
 * This version was created on Debian GNU/Linux 2.x.
 * Delete, Backspace, Home, End, and the arrow keys were tested
 * to work in an Xterm and console. Ctrl-A also works as Home.
 * Ctrl-E also works as End.
 *
 * The following readline-like commands are not implemented:
 * CTL-t -- Transpose two characters
 *
 * lineedit does not know that the terminal escape sequences do not
 * take up space on the screen. The redisplay code assumes, unless
 * told otherwise, that each character in the prompt is a printable
 * character that takes up one character position on the screen.
 * You need to tell lineedit that some sequences of characters
 * in the prompt take up no screen space. Compatibly with readline,
 * use the \[ escape to begin a sequence of non-printing characters,
 * and the \] escape to signal the end of such a sequence. Example:
 *
 * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
 *
 * Unicode in PS1 is not fully supported: prompt length calulation is wrong,
 * resulting in line wrap problems with long (multi-line) input.
 */
#include "busybox.h"
#include "NUM_APPLETS.h"
#include "unicode.h"
#ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE '\0'
#endif


#ifdef TEST
# define ENABLE_FEATURE_EDITING 0
# define ENABLE_FEATURE_TAB_COMPLETION 0
# define ENABLE_FEATURE_USERNAME_COMPLETION 0
#endif


/* Entire file (except TESTing part) sits inside this #if */
#if ENABLE_FEATURE_EDITING


#define ENABLE_USERNAME_OR_HOMEDIR \
	(ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
#define IF_USERNAME_OR_HOMEDIR(...)
#if ENABLE_USERNAME_OR_HOMEDIR
# undef IF_USERNAME_OR_HOMEDIR
# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
#endif


#undef CHAR_T
#if ENABLE_UNICODE_SUPPORT
# define BB_NUL ((wchar_t)0)
# define CHAR_T wchar_t
static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
# if ENABLE_FEATURE_EDITING_VI
static bool BB_isalnum_or_underscore(CHAR_T c) {
	return ((unsigned)c < 256 && isalnum(c)) || c == '_';
}
# endif
static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
# undef isspace
# undef isalnum
# undef ispunct
# undef isprint
# define isspace isspace_must_not_be_used
# define isalnum isalnum_must_not_be_used
# define ispunct ispunct_must_not_be_used
# define isprint isprint_must_not_be_used
#else
# define BB_NUL '\0'
# define CHAR_T char
# define BB_isspace(c) isspace(c)
# if ENABLE_FEATURE_EDITING_VI
static bool BB_isalnum_or_underscore(CHAR_T c) {
	return ((unsigned)c < 256 && isalnum(c)) || c == '_';
}
# endif
# define BB_ispunct(c) ispunct(c)
#endif
#if ENABLE_UNICODE_PRESERVE_BROKEN
# define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
# define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
#else
# define unicode_is_raw_byte(wc)     0
#endif


#define ESC "\033"

#define SEQ_CLEAR_TILL_END_OF_SCREEN  ESC"[J"
//#define SEQ_CLEAR_TILL_END_OF_LINE  ESC"[K"


enum {
	MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
	              ? CONFIG_FEATURE_EDITING_MAX_LEN
	              : 0x7ff0
};

#if ENABLE_USERNAME_OR_HOMEDIR
static const char null_str[] ALIGN1 = "";
#endif

/* We try to minimize both static and stack usage. */
struct lineedit_statics {
	line_input_t *state;

	unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */

	unsigned cmdedit_x;        /* real x (col) terminal position */
	unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
	unsigned cmdedit_prmt_len; /* on-screen length of last/sole prompt line */

	unsigned cursor;
	int command_len; /* must be signed */
	/* signed maxsize: we want x in "if (x > S.maxsize)"
	 * to _not_ be promoted to unsigned */
	int maxsize;
	CHAR_T *command_ps;

	const char *cmdedit_prompt;
	const char *prompt_last_line;  /* last/sole prompt line */

#if ENABLE_USERNAME_OR_HOMEDIR
	char *user_buf;
	char *home_pwd_buf; /* = (char*)null_str; */
#endif

#if ENABLE_FEATURE_TAB_COMPLETION
	char **matches;
	unsigned num_matches;
#endif

	unsigned SIGWINCH_saved;
	volatile unsigned SIGWINCH_count;
	volatile smallint ok_to_redraw;

#if ENABLE_FEATURE_EDITING_VI
# define DELBUFSIZ 128
	smallint newdelflag;     /* whether delbuf should be reused yet */
	CHAR_T *delptr;
	CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
#endif
#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
	smallint sent_ESC_br6n;
#endif

	/* Largish struct, keeping it last results in smaller code */
	struct sigaction SIGWINCH_handler;
};

/* See lineedit_ptr_hack.c */
extern struct lineedit_statics *const lineedit_ptr_to_statics;

#define S (*lineedit_ptr_to_statics)
#define state            (S.state           )
#define cmdedit_termw    (S.cmdedit_termw   )
#define cmdedit_x        (S.cmdedit_x       )
#define cmdedit_y        (S.cmdedit_y       )
#define cmdedit_prmt_len (S.cmdedit_prmt_len)
#define cursor           (S.cursor          )
#define command_len      (S.command_len     )
#define command_ps       (S.command_ps      )
#define cmdedit_prompt   (S.cmdedit_prompt  )
#define prompt_last_line (S.prompt_last_line)
#define user_buf         (S.user_buf        )
#define home_pwd_buf     (S.home_pwd_buf    )
#define matches          (S.matches         )
#define num_matches      (S.num_matches     )
#define delptr           (S.delptr          )
#define newdelflag       (S.newdelflag      )
#define delbuf           (S.delbuf          )

#define INIT_S() do { \
	(*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
	barrier(); \
	cmdedit_termw = 80; \
	IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
	IF_FEATURE_EDITING_VI(delptr = delbuf;) \
} while (0)

static void deinit_S(void)
{
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
	/* This one is allocated only if FANCY_PROMPT is on
	 * (otherwise it points to verbatim prompt (NOT malloced)) */
	free((char*)cmdedit_prompt);
#endif
#if ENABLE_USERNAME_OR_HOMEDIR
	free(user_buf);
	if (home_pwd_buf != null_str)
		free(home_pwd_buf);
#endif
	free(lineedit_ptr_to_statics);
}
#define DEINIT_S() deinit_S()


#if ENABLE_UNICODE_SUPPORT
static size_t load_string(const char *src)
{
	if (unicode_status == UNICODE_ON) {
		ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
		if (len < 0)
			len = 0;
		command_ps[len] = BB_NUL;
		return len;
	} else {
		unsigned i = 0;
		while (src[i] && i < S.maxsize - 1) {
			command_ps[i] = src[i];
			i++;
		}
		command_ps[i] = BB_NUL;
		return i;
	}
}
static unsigned save_string(char *dst, unsigned maxsize)
{
	if (unicode_status == UNICODE_ON) {
# if !ENABLE_UNICODE_PRESERVE_BROKEN
		ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
		if (len < 0)
			len = 0;
		dst[len] = '\0';
		return len;
# else
		unsigned dstpos = 0;
		unsigned srcpos = 0;

		maxsize--;
		while (dstpos < maxsize) {
			wchar_t wc;
			int n = srcpos;

			/* Convert up to 1st invalid byte (or up to end) */
			while ((wc = command_ps[srcpos]) != BB_NUL
			    && !unicode_is_raw_byte(wc)
			) {
				srcpos++;
			}
			command_ps[srcpos] = BB_NUL;
			n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
			if (n < 0) /* should not happen */
				break;
			dstpos += n;
			if (wc == BB_NUL) /* usually is */
				break;

			/* We do have invalid byte here! */
			command_ps[srcpos] = wc; /* restore it */
			srcpos++;
			if (dstpos == maxsize)
				break;
			dst[dstpos++] = (char) wc;
		}
		dst[dstpos] = '\0';
		return dstpos;
# endif
	} else {
		unsigned i = 0;
		while ((dst[i] = command_ps[i]) != 0)
			i++;
		return i;
	}
}
/* I thought just fputwc(c, stdout) would work. But no... */
static void BB_PUTCHAR(wchar_t c)
{
	if (unicode_status == UNICODE_ON) {
		char buf[MB_CUR_MAX + 1];
		mbstate_t mbst = { 0 };
		ssize_t len = wcrtomb(buf, c, &mbst);
		if (len > 0) {
			buf[len] = '\0';
			fputs(buf, stdout);
		}
	} else {
		/* In this case, c is always one byte */
		putchar(c);
	}
}
# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
# else
static wchar_t adjust_width_and_validate_wc(wchar_t wc)
#  define adjust_width_and_validate_wc(width_adj, wc) \
	((*(width_adj))++, adjust_width_and_validate_wc(wc))
# endif
{
	int w = 1;

	if (unicode_status == UNICODE_ON) {
		if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
			/* note: also true for unicode_is_raw_byte(wc) */
			goto subst;
		}
		w = wcwidth(wc);
		if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
		 || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
		 || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
		) {
 subst:
			w = 1;
			wc = CONFIG_SUBST_WCHAR;
		}
	}

# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
	*width_adj += w;
#endif
	return wc;
}
#else /* !UNICODE */
static size_t load_string(const char *src)
{
	safe_strncpy(command_ps, src, S.maxsize);
	return strlen(command_ps);
}
# if ENABLE_FEATURE_TAB_COMPLETION
static void save_string(char *dst, unsigned maxsize)
{
	safe_strncpy(dst, command_ps, maxsize);
}
# endif
# define BB_PUTCHAR(c) bb_putchar(c)
/* Should never be called: */
int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
#endif


/* Put 'command_ps[cursor]', cursor++.
 * Advance cursor on screen. If we reached right margin, scroll text up
 * and remove terminal margin effect by printing 'next_char' */
#define HACK_FOR_WRONG_WIDTH 1
static void put_cur_glyph_and_inc_cursor(void)
{
	CHAR_T c = command_ps[cursor];
	unsigned width = 0;
	int ofs_to_right;

	if (c == BB_NUL) {
		/* erase character after end of input string */
		c = ' ';
	} else {
		/* advance cursor only if we aren't at the end yet */
		cursor++;
		if (unicode_status == UNICODE_ON) {
			IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
			c = adjust_width_and_validate_wc(&cmdedit_x, c);
			IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
		} else {
			cmdedit_x++;
		}
	}

	ofs_to_right = cmdedit_x - cmdedit_termw;
	if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
		/* c fits on this line */
		BB_PUTCHAR(c);
	}

	if (ofs_to_right >= 0) {
		/* we go to the next line */
#if HACK_FOR_WRONG_WIDTH
		/* This works better if our idea of term width is wrong
		 * and it is actually wider (often happens on serial lines).
		 * Printing CR,LF *forces* cursor to next line.
		 * OTOH if terminal width is correct AND terminal does NOT
		 * have automargin (IOW: it is moving cursor to next line
		 * by itself (which is wrong for VT-10x terminals)),
		 * this will break things: there will be one extra empty line */
		puts("\r"); /* + implicit '\n' */
#else
		/* VT-10x terminals don't wrap cursor to next line when last char
		 * on the line is printed - cursor stays "over" this char.
		 * Need to print _next_ char too (first one to appear on next line)
		 * to make cursor move down to next line.
		 */
		/* Works ok only if cmdedit_termw is correct. */
		c = command_ps[cursor];
		if (c == BB_NUL)
			c = ' ';
		BB_PUTCHAR(c);
		bb_putchar('\b');
#endif
		cmdedit_y++;
		if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
			width = 0;
		} else { /* ofs_to_right > 0 */
			/* wide char c didn't fit on prev line */
			BB_PUTCHAR(c);
		}
		cmdedit_x = width;
	}
}

/* Move to end of line (by printing all chars till the end) */
static void put_till_end_and_adv_cursor(void)
{
	while (cursor < command_len)
		put_cur_glyph_and_inc_cursor();
}

/* Go to the next line */
static void goto_new_line(void)
{
	put_till_end_and_adv_cursor();
	if (cmdedit_x != 0)
		bb_putchar('\n');
}

static void beep(void)
{
	bb_putchar('\007');
}

/* Full or last/sole prompt line, reset edit cursor, calculate terminal cursor.
 * cmdedit_y is always calculated for the last/sole prompt line.
 */
static void put_prompt_custom(bool is_full)
{
	fputs((is_full ? cmdedit_prompt : prompt_last_line), stdout);
	cursor = 0;
	cmdedit_y = cmdedit_prmt_len / cmdedit_termw; /* new quasireal y */
	cmdedit_x = cmdedit_prmt_len % cmdedit_termw;
}

#define put_prompt_last_line() put_prompt_custom(0)
#define put_prompt()           put_prompt_custom(1)

/* Move back one character */
/* (optimized for slow terminals) */
static void input_backward(unsigned num)
{
	if (num > cursor)
		num = cursor;
	if (num == 0)
		return;
	cursor -= num;

	if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
	 && unicode_status == UNICODE_ON
	) {
		/* correct NUM to be equal to _screen_ width */
		int n = num;
		num = 0;
		while (--n >= 0)
			adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
		if (num == 0)
			return;
	}

	if (cmdedit_x >= num) {
		cmdedit_x -= num;
		if (num <= 4) {
			/* This is longer by 5 bytes on x86.
			 * Also gets miscompiled for ARM users
			 * (busybox.net/bugs/view.php?id=2274).
			 * printf(("\b\b\b\b" + 4) - num);
			 * return;
			 */
			do {
				bb_putchar('\b');
			} while (--num);
			return;
		}
		printf(ESC"[%uD", num);
		return;
	}

	/* Need to go one or more lines up */
	if (ENABLE_UNICODE_WIDE_WCHARS) {
		/* With wide chars, it is hard to "backtrack"
		 * and reliably figure out where to put cursor.
		 * Example (<> is a wide char; # is an ordinary char, _ cursor):
		 * |prompt: <><> |
		 * |<><><><><><> |
		 * |_            |
		 * and user presses left arrow. num = 1, cmdedit_x = 0,
		 * We need to go up one line, and then - how do we know that
		 * we need to go *10* positions to the right? Because
		 * |prompt: <>#<>|
		 * |<><><>#<><><>|
		 * |_            |
		 * in this situation we need to go *11* positions to the right.
		 *
		 * A simpler thing to do is to redraw everything from the start
		 * up to new cursor position (which is already known):
		 */
		unsigned sv_cursor;
		/* go to 1st column; go up to first line */
		printf("\r" ESC"[%uA", cmdedit_y);
		cmdedit_y = 0;
		sv_cursor = cursor;
		put_prompt_last_line(); /* sets cursor to 0 */
		while (cursor < sv_cursor)
			put_cur_glyph_and_inc_cursor();
	} else {
		int lines_up;
		/* num = chars to go back from the beginning of current line: */
		num -= cmdedit_x;
		/* num=1...w: one line up, w+1...2w: two, etc: */
		lines_up = 1 + (num - 1) / cmdedit_termw;
		cmdedit_x = (cmdedit_termw * cmdedit_y - num) % cmdedit_termw;
		cmdedit_y -= lines_up;
		/* go to 1st column; go up */
		printf("\r" ESC"[%uA", lines_up);
		/* go to correct column.
		 * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
		 * need to *make sure* we skip it if cmdedit_x == 0 */
		if (cmdedit_x)
			printf(ESC"[%uC", cmdedit_x);
	}
}

/* See redraw and draw_full below */
static void draw_custom(int y, int back_cursor, bool is_full)
{
	if (y > 0) /* up y lines */
		printf(ESC"[%uA", y);
	bb_putchar('\r');
	put_prompt_custom(is_full);
	put_till_end_and_adv_cursor();
	printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
	input_backward(back_cursor);
}

/* Move y lines up, draw last/sole prompt line, editor line[s], and clear tail.
 * goal: redraw the prompt+input+cursor in-place, overwriting the previous */
#define redraw(y, back_cursor) draw_custom((y), (back_cursor), 0)

/* Like above, but without moving up, and while using all the prompt lines.
 * goal: draw a full prompt+input+cursor unrelated to a previous position.
 * note: cmdedit_y always ends up relating to the last/sole prompt line */
#define draw_full(back_cursor) draw_custom(0, (back_cursor), 1)

/* Delete the char in front of the cursor, optionally saving it
 * for later putback */
#if !ENABLE_FEATURE_EDITING_VI
static void input_delete(void)
#define input_delete(save) input_delete()
#else
static void input_delete(int save)
#endif
{
	int j = cursor;

	if (j == (int)command_len)
		return;

#if ENABLE_FEATURE_EDITING_VI
	if (save) {
		if (newdelflag) {
			delptr = delbuf;
			newdelflag = 0;
		}
		if ((delptr - delbuf) < DELBUFSIZ)
			*delptr++ = command_ps[j];
	}
#endif

	memmove(command_ps + j, command_ps + j + 1,
			/* (command_len + 1 [because of NUL]) - (j + 1)
			 * simplified into (command_len - j) */
			(command_len - j) * sizeof(command_ps[0]));
	command_len--;
	put_till_end_and_adv_cursor();
	/* Last char is still visible, erase it (and more) */
	printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
	input_backward(cursor - j);     /* back to old pos cursor */
}

#if ENABLE_FEATURE_EDITING_VI
static void put(void)
{
	int ocursor;
	int j = delptr - delbuf;

	if (j == 0)
		return;
	ocursor = cursor;
	/* open hole and then fill it */
	memmove(command_ps + cursor + j, command_ps + cursor,
			(command_len - cursor + 1) * sizeof(command_ps[0]));
	memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
	command_len += j;
	put_till_end_and_adv_cursor();
	input_backward(cursor - ocursor - j + 1); /* at end of new text */
}
#endif

/* Delete the char in back of the cursor */
static void input_backspace(void)
{
	if (cursor > 0) {
		input_backward(1);
		input_delete(0);
	}
}

/* Move forward one character */
static void input_forward(void)
{
	if (cursor < command_len)
		put_cur_glyph_and_inc_cursor();
}

#if ENABLE_FEATURE_TAB_COMPLETION

//FIXME:
//needs to be more clever: currently it thinks that "foo\ b<TAB>
//matches the file named "foo bar", which is untrue.
//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
//not "foo bar <cursor>...

static void free_tab_completion_data(void)
{
	if (matches) {
		while (num_matches)
			free(matches[--num_matches]);
		free(matches);
		matches = NULL;
	}
}

static void add_match(char *matched)
{
	unsigned char *p = (unsigned char*)matched;
	while (*p) {
		/* ESC attack fix: drop any string with control chars */
		if (*p < ' '
		 || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
		 || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
		) {
			free(matched);
			return;
		}
		p++;
	}
	matches = xrealloc_vector(matches, 4, num_matches);
	matches[num_matches] = matched;
	num_matches++;
}

# if ENABLE_FEATURE_USERNAME_COMPLETION
/* Replace "~user/..." with "/homedir/...".
 * The parameter is malloced, free it or return it
 * unchanged if no user is matched.
 */
static char *username_path_completion(char *ud)
{
	struct passwd *entry;
	char *tilde_name = ud;
	char *home = NULL;

	ud++; /* skip ~ */
	if (*ud == '/') {       /* "~/..." */
		home = home_pwd_buf;
	} else {
		/* "~user/..." */
		ud = strchr(ud, '/');
		*ud = '\0';           /* "~user" */
		entry = getpwnam(tilde_name + 1);
		*ud = '/';            /* restore "~user/..." */
		if (entry)
			home = entry->pw_dir;
	}
	if (home) {
		ud = concat_path_file(home, ud);
		free(tilde_name);
		tilde_name = ud;
	}
	return tilde_name;
}

/* ~use<tab> - find all users with this prefix.
 * Return the length of the prefix used for matching.
 */
static NOINLINE unsigned complete_username(const char *ud)
{
	struct passwd *pw;
	unsigned userlen;

	ud++; /* skip ~ */
	userlen = strlen(ud);

	setpwent();
	while ((pw = getpwent()) != NULL) {
		/* Null usernames should result in all users as possible completions. */
		if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
			add_match(xasprintf("~%s/", pw->pw_name));
		}
	}
	endpwent(); /* don't keep password file open */

	return 1 + userlen;
}
# endif  /* FEATURE_USERNAME_COMPLETION */

enum {
	FIND_EXE_ONLY = 0,
	FIND_DIR_ONLY = 1,
	FIND_FILE_ONLY = 2,
};

static int path_parse(char ***p)
{
	int npth;
	const char *pth;
	char *tmp;
	char **res;

	if (state->flags & WITH_PATH_LOOKUP)
		pth = state->path_lookup;
	else
		pth = getenv("PATH");

	/* PATH="" or PATH=":"? */
	if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
		return 1;

	tmp = (char*)pth;
	npth = 1; /* path component count */
	while (1) {
		tmp = strchr(tmp, ':');
		if (!tmp)
			break;
		tmp++;
		if (*tmp == '\0')
			break;  /* :<empty> */
		npth++;
	}

	*p = res = xmalloc(npth * sizeof(res[0]));
	res[0] = tmp = xstrdup(pth);
	npth = 1;
	while (1) {
		tmp = strchr(tmp, ':');
		if (!tmp)
			break;
		*tmp++ = '\0'; /* ':' -> '\0' */
		if (*tmp == '\0')
			break; /* :<empty> */
		res[npth++] = tmp;
	}
	return npth;
}

/* Complete command, directory or file name.
 * Return the length of the prefix used for matching.
 */
static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
{
	char *path1[1];
	char **paths = path1;
	int npaths;
	int i;
	unsigned pf_len;
	const char *pfind;
	char *dirbuf = NULL;

	npaths = 1;
	path1[0] = (char*)".";

	pfind = strrchr(command, '/');
	if (!pfind) {
		if (type == FIND_EXE_ONLY)
			npaths = path_parse(&paths);
		pfind = command;
	} else {
		/* point to 'l' in "..../last_component" */
		pfind++;
		/* dirbuf = ".../.../.../" */
		dirbuf = xstrndup(command, pfind - command);
# if ENABLE_FEATURE_USERNAME_COMPLETION
		if (dirbuf[0] == '~')   /* ~/... or ~user/... */
			dirbuf = username_path_completion(dirbuf);
# endif
		path1[0] = dirbuf;
	}
	pf_len = strlen(pfind);

# if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
	if (type == FIND_EXE_ONLY && !dirbuf) {
		const char *p = applet_names;

		while (*p) {
			if (strncmp(pfind, p, pf_len) == 0)
				add_match(xstrdup(p));
			while (*p++ != '\0')
				continue;
		}
	}
# endif

	for (i = 0; i < npaths; i++) {
		DIR *dir;
		struct dirent *next;
		struct stat st;
		char *found;

		dir = opendir(paths[i]);
		if (!dir)
			continue; /* don't print an error */

		while ((next = readdir(dir)) != NULL) {
			unsigned len;
			const char *name_found = next->d_name;

			/* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
			if (!pfind[0] && DOT_OR_DOTDOT(name_found))
				continue;
			/* match? */
			if (!is_prefixed_with(name_found, pfind))
				continue; /* no */

			found = concat_path_file(paths[i], name_found);
			/* NB: stat() first so that we see is it a directory;
			 * but if that fails, use lstat() so that
			 * we still match dangling links */
			if (stat(found, &st) && lstat(found, &st))
				goto cont; /* hmm, remove in progress? */

			/* Save only name */
			len = strlen(name_found);
			found = xrealloc(found, len + 2); /* +2: for slash and NUL */
			strcpy(found, name_found);

			if (S_ISDIR(st.st_mode)) {
				/* name is a directory, add slash */
				found[len] = '/';
				found[len + 1] = '\0';
			} else {
				/* skip files if looking for dirs only (example: cd) */
				if (type == FIND_DIR_ONLY)
					goto cont;
			}
			/* add it to the list */
			add_match(found);
			continue;
 cont:
			free(found);
		}
		closedir(dir);
	} /* for every path */

	if (paths != path1) {
		free(paths[0]); /* allocated memory is only in first member */
		free(paths);
	}
	free(dirbuf);

	return pf_len;
}

/* build_match_prefix:
 * On entry, match_buf contains everything up to cursor at the moment <tab>
 * was pressed. This function looks at it, figures out what part of it
 * constitutes the command/file/directory prefix to use for completion,
 * and rewrites match_buf to contain only that part.
 */
#define dbg_bmp 0
/* Helpers: */
/* QUOT is used on elements of int_buf[], which are bytes,
 * not Unicode chars. Therefore it works correctly even in Unicode mode.
 */
#define QUOT (UCHAR_MAX+1)
static void remove_chunk(int16_t *int_buf, int beg, int end)
{
	/* beg must be <= end */
	if (beg == end)
		return;

	while ((int_buf[beg] = int_buf[end]) != 0)
		beg++, end++;

	if (dbg_bmp) {
		int i;
		for (i = 0; int_buf[i]; i++)
			bb_putchar((unsigned char)int_buf[i]);
		bb_putchar('\n');
	}
}
/* Caller ensures that match_buf points to a malloced buffer
 * big enough to hold strlen(match_buf)*2 + 2
 */
static NOINLINE int build_match_prefix(char *match_buf)
{
	int i, j;
	int command_mode;
	int16_t *int_buf = (int16_t*)match_buf;

	if (dbg_bmp) printf("\n%s\n", match_buf);

	/* Copy in reverse order, since they overlap */
	i = strlen(match_buf);
	do {
		int_buf[i] = (unsigned char)match_buf[i];
		i--;
	} while (i >= 0);

	/* Mark every \c as "quoted c" */
	for (i = 0; int_buf[i]; i++) {
		if (int_buf[i] == '\\') {
			remove_chunk(int_buf, i, i + 1);
			int_buf[i] |= QUOT;
		}
	}
	/* Quote-mark "chars" and 'chars', drop delimiters */
	{
		int in_quote = 0;
		i = 0;
		while (int_buf[i]) {
			int cur = int_buf[i];
			if (!cur)
				break;
			if (cur == '\'' || cur == '"') {
				if (!in_quote || (cur == in_quote)) {
					in_quote ^= cur;
					remove_chunk(int_buf, i, i + 1);
					continue;
				}
			}
			if (in_quote)
				int_buf[i] = cur | QUOT;
			i++;
		}
	}

	/* Remove everything up to command delimiters:
	 * ';' ';;' '&' '|' '&&' '||',
	 * but careful with '>&' '<&' '>|'
	 */
	for (i = 0; int_buf[i]; i++) {
		int cur = int_buf[i];
		if (cur == ';' || cur == '&' || cur == '|') {
			int prev = i ? int_buf[i - 1] : 0;
			if (cur == '&' && (prev == '>' || prev == '<')) {
				continue;
			} else if (cur == '|' && prev == '>') {
				continue;
			}
			remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
			i = -1;  /* back to square 1 */
		}
	}
	/* Remove all `cmd` */
	for (i = 0; int_buf[i]; i++) {
		if (int_buf[i] == '`') {
			for (j = i + 1; int_buf[j]; j++) {
				if (int_buf[j] == '`') {
					/* `cmd` should count as a word:
					 * `cmd` c<tab> should search for files c*,
					 * not commands c*. Therefore we don't drop
					 * `cmd` entirely, we replace it with single `.
					 */
					remove_chunk(int_buf, i, j);
					goto next;
				}
			}
			/* No closing ` - command mode, remove all up to ` */
			remove_chunk(int_buf, 0, i + 1);
			break;
 next: ;
		}
	}

	/* Remove "cmd (" and "cmd {"
	 * Example: "if { c<tab>"
	 * In this example, c should be matched as command pfx.
	 */
	for (i = 0; int_buf[i]; i++) {
		if (int_buf[i] == '(' || int_buf[i] == '{') {
			remove_chunk(int_buf, 0, i + 1);
			i = -1;  /* back to square 1 */
		}
	}

	/* Remove leading unquoted spaces */
	for (i = 0; int_buf[i]; i++)
		if (int_buf[i] != ' ')
			break;
	remove_chunk(int_buf, 0, i);

	/* Determine completion mode */
	command_mode = FIND_EXE_ONLY;
	for (i = 0; int_buf[i]; i++) {
		if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
			if (int_buf[i] == ' '
			 && command_mode == FIND_EXE_ONLY
			 && (char)int_buf[0] == 'c'
			 && (char)int_buf[1] == 'd'
			 && i == 2 /* -> int_buf[2] == ' ' */
			) {
				command_mode = FIND_DIR_ONLY;
			} else {
				command_mode = FIND_FILE_ONLY;
				break;
			}
		}
	}
	if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);

	/* Remove everything except last word */
	for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
		continue;
	for (--i; i >= 0; i--) {
		int cur = int_buf[i];
		if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
			remove_chunk(int_buf, 0, i + 1);
			break;
		}
	}

	/* Convert back to string of _chars_ */
	i = 0;
	while ((match_buf[i] = int_buf[i]) != '\0')
		i++;

	if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);

	return command_mode;
}

/*
 * Display by column (original idea from ls applet,
 * very optimized by me [Vladimir] :)
 */
static void showfiles(void)
{
	int ncols, row;
	int column_width = 0;
	int nfiles = num_matches;
	int nrows = nfiles;
	int l;

	/* find the longest file name - use that as the column width */
	for (row = 0; row < nrows; row++) {
		l = unicode_strwidth(matches[row]);
		if (column_width < l)
			column_width = l;
	}
	column_width += 2;              /* min space for columns */
	ncols = cmdedit_termw / column_width;

	if (ncols > 1) {
		nrows /= ncols;
		if (nfiles % ncols)
			nrows++;        /* round up fractionals */
	} else {
		ncols = 1;
	}
	for (row = 0; row < nrows; row++) {
		int n = row;
		int nc;

		for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
			printf("%s%-*s", matches[n],
				(int)(column_width - unicode_strwidth(matches[n])), ""
			);
		}
		if (ENABLE_UNICODE_SUPPORT)
			puts(printable_string(NULL, matches[n]));
		else
			puts(matches[n]);
	}
}

static const char *is_special_char(char c)
{
	return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
}

static char *quote_special_chars(char *found)
{
	int l = 0;
	char *s = xzalloc((strlen(found) + 1) * 2);

	while (*found) {
		if (is_special_char(*found))
			s[l++] = '\\';
		s[l++] = *found++;
	}
	/* s[l] = '\0'; - already is */
	return s;
}

/* Do TAB completion */
static NOINLINE void input_tab(smallint *lastWasTab)
{
	char *chosen_match;
	char *match_buf;
	size_t len_found;
	/* Length of string used for matching */
	unsigned match_pfx_len = match_pfx_len;
	int find_type;
# if ENABLE_UNICODE_SUPPORT
	/* cursor pos in command converted to multibyte form */
	int cursor_mb;
# endif
	if (!(state->flags & TAB_COMPLETION))
		return;

	if (*lastWasTab) {
		/* The last char was a TAB too.
		 * Print a list of all the available choices.
		 */
		if (num_matches > 0) {
			/* cursor will be changed by goto_new_line() */
			int sav_cursor = cursor;
			goto_new_line();
			showfiles();
			draw_full(command_len - sav_cursor);
		}
		return;
	}

	*lastWasTab = 1;
	chosen_match = NULL;

	/* Make a local copy of the string up to the position of the cursor.
	 * build_match_prefix will expand it into int16_t's, need to allocate
	 * twice as much as the string_len+1.
	 * (we then also (ab)use this extra space later - see (**))
	 */
	match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
# if !ENABLE_UNICODE_SUPPORT
	save_string(match_buf, cursor + 1); /* +1 for NUL */
# else
	{
		CHAR_T wc = command_ps[cursor];
		command_ps[cursor] = BB_NUL;
		save_string(match_buf, MAX_LINELEN);
		command_ps[cursor] = wc;
		cursor_mb = strlen(match_buf);
	}
# endif
	find_type = build_match_prefix(match_buf);

	/* Free up any memory already allocated */
	free_tab_completion_data();

# if ENABLE_FEATURE_USERNAME_COMPLETION
	/* If the word starts with ~ and there is no slash in the word,
	 * then try completing this word as a username. */
	if (state->flags & USERNAME_COMPLETION)
		if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
			match_pfx_len = complete_username(match_buf);
# endif
	/* If complete_username() did not match,
	 * try to match a command in $PATH, or a directory, or a file */
	if (!matches)
		match_pfx_len = complete_cmd_dir_file(match_buf, find_type);

	/* Account for backslashes which will be inserted
	 * by quote_special_chars() later */
	{
		const char *e = match_buf + strlen(match_buf);
		const char *s = e - match_pfx_len;
		while (s < e)
			if (is_special_char(*s++))
				match_pfx_len++;
	}

	/* Remove duplicates */
	if (matches) {
		unsigned i, n = 0;
		qsort_string_vector(matches, num_matches);
		for (i = 0; i < num_matches - 1; ++i) {
			//if (matches[i] && matches[i+1]) { /* paranoia */
				if (strcmp(matches[i], matches[i+1]) == 0) {
					free(matches[i]);
					//matches[i] = NULL; /* paranoia */
				} else {
					matches[n++] = matches[i];
				}
			//}
		}
		matches[n++] = matches[i];
		num_matches = n;
	}

	/* Did we find exactly one match? */
	if (num_matches != 1) { /* no */
		char *cp;
		beep();
		if (!matches)
			goto ret; /* no matches at all */
		/* Find common prefix */
		chosen_match = xstrdup(matches[0]);
		for (cp = chosen_match; *cp; cp++) {
			unsigned n;
			for (n = 1; n < num_matches; n++) {
				if (matches[n][cp - chosen_match] != *cp) {
					goto stop;
				}
			}
		}
 stop:
		if (cp == chosen_match) { /* have unique prefix? */
			goto ret; /* no */
		}
		*cp = '\0';
		cp = quote_special_chars(chosen_match);
		free(chosen_match);
		chosen_match = cp;
		len_found = strlen(chosen_match);
	} else {                        /* exactly one match */
		/* Next <tab> is not a double-tab */
		*lastWasTab = 0;

		chosen_match = quote_special_chars(matches[0]);
		len_found = strlen(chosen_match);
		if (chosen_match[len_found-1] != '/') {
			chosen_match[len_found] = ' ';
			chosen_match[++len_found] = '\0';
		}
	}

# if !ENABLE_UNICODE_SUPPORT
	/* Have space to place the match? */
	/* The result consists of three parts with these lengths: */
	/* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
	/* it simplifies into: */
	if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
		int pos;
		/* save tail */
		strcpy(match_buf, &command_ps[cursor]);
		/* add match and tail */
		sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
		command_len = strlen(command_ps);
		/* new pos */
		pos = cursor + len_found - match_pfx_len;
		/* write out the matched command */
		redraw(cmdedit_y, command_len - pos);
	}
# else
	{
		/* Use 2nd half of match_buf as scratch space - see (**) */
		char *command = match_buf + MAX_LINELEN;
		int len = save_string(command, MAX_LINELEN);
		/* Have space to place the match? */
		/* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
		if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
			int pos;
			/* save tail */
			strcpy(match_buf, &command[cursor_mb]);
			/* where do we want to have cursor after all? */
			strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
			len = load_string(command);
			/* add match and tail */
			sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
			command_len = load_string(command);
			/* write out the matched command */
			/* paranoia: load_string can return 0 on conv error,
			 * prevent passing pos = (0 - 12) to redraw */
			pos = command_len - len;
			redraw(cmdedit_y, pos >= 0 ? pos : 0);
		}
	}
# endif
 ret:
	free(chosen_match);
	free(match_buf);
}

#endif  /* FEATURE_TAB_COMPLETION */


line_input_t* FAST_FUNC new_line_input_t(int flags)
{
	line_input_t *n = xzalloc(sizeof(*n));
	n->flags = flags;
	n->timeout = -1;
#if MAX_HISTORY > 0
	n->max_history = MAX_HISTORY;
#endif
	return n;
}


#if MAX_HISTORY > 0

unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
{
	int size = MAX_HISTORY;
	if (hp) {
		size = atoi(hp);
		if (size <= 0)
			return 1;
		if (size > MAX_HISTORY)
			return MAX_HISTORY;
	}
	return size;
}

static void save_command_ps_at_cur_history(void)
{
	if (command_ps[0] != BB_NUL) {
		int cur = state->cur_history;
		free(state->history[cur]);

# if ENABLE_UNICODE_SUPPORT
		{
			char tbuf[MAX_LINELEN];
			save_string(tbuf, sizeof(tbuf));
			state->history[cur] = xstrdup(tbuf);
		}
# else
		state->history[cur] = xstrdup(command_ps);
# endif
	}
}

/* state->flags is already checked to be nonzero */
static int get_previous_history(void)
{
	if ((state->flags & DO_HISTORY) && state->cur_history) {
		save_command_ps_at_cur_history();
		state->cur_history--;
		return 1;
	}
	beep();
	return 0;
}

static int get_next_history(void)
{
	if (state->flags & DO_HISTORY) {
		if (state->cur_history < state->cnt_history) {
			save_command_ps_at_cur_history(); /* save the current history line */
			return ++state->cur_history;
		}
	}
	beep();
	return 0;
}

/* Lists command history. Used by shell 'history' builtins */
void FAST_FUNC show_history(const line_input_t *st)
{
	int i;

	if (!st)
		return;
	for (i = 0; i < st->cnt_history; i++)
		printf("%4d %s\n", i, st->history[i]);
}

# if ENABLE_FEATURE_EDITING_SAVEHISTORY
/* We try to ensure that concurrent additions to the history
 * do not overwrite each other.
 * Otherwise shell users get unhappy.
 *
 * History file is trimmed lazily, when it grows several times longer
 * than configured MAX_HISTORY lines.
 */

static void free_line_input_t(line_input_t *n)
{
	int i = n->cnt_history;
	while (i > 0)
		free(n->history[--i]);
	free(n);
}

/* state->flags is already checked to be nonzero */
static void load_history(line_input_t *st_parm)
{
	char *temp_h[MAX_HISTORY];
	char *line;
	FILE *fp;
	unsigned idx, i, line_len;

	/* NB: do not trash old history if file can't be opened */

	fp = fopen_for_read(st_parm->hist_file);
	if (fp) {
		/* clean up old history */
		for (idx = st_parm->cnt_history; idx > 0;) {
			idx--;
			free(st_parm->history[idx]);
			st_parm->history[idx] = NULL;
		}

		/* fill temp_h[], retaining only last MAX_HISTORY lines */
		memset(temp_h, 0, sizeof(temp_h));
		idx = 0;
		st_parm->cnt_history_in_file = 0;
		while ((line = xmalloc_fgetline(fp)) != NULL) {
			if (line[0] == '\0') {
				free(line);
				continue;
			}
			free(temp_h[idx]);
			temp_h[idx] = line;
			st_parm->cnt_history_in_file++;
			idx++;
			if (idx == st_parm->max_history)
				idx = 0;
		}
		fclose(fp);

		/* find first non-NULL temp_h[], if any */
		if (st_parm->cnt_history_in_file) {
			while (temp_h[idx] == NULL) {
				idx++;
				if (idx == st_parm->max_history)
					idx = 0;
			}
		}

		/* copy temp_h[] to st_parm->history[] */
		for (i = 0; i < st_parm->max_history;) {
			line = temp_h[idx];
			if (!line)
				break;
			idx++;
			if (idx == st_parm->max_history)
				idx = 0;
			line_len = strlen(line);
			if (line_len >= MAX_LINELEN)
				line[MAX_LINELEN-1] = '\0';
			st_parm->history[i++] = line;
		}
		st_parm->cnt_history = i;
		if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
			st_parm->cnt_history_in_file = i;
	}
}

#  if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
void save_history(line_input_t *st)
{
	FILE *fp;

	if (!st->hist_file)
		return;
	if (st->cnt_history <= st->cnt_history_in_file)
		return;

	fp = fopen(st->hist_file, "a");
	if (fp) {
		int i, fd;
		char *new_name;
		line_input_t *st_temp;

		for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
			fprintf(fp, "%s\n", st->history[i]);
		fclose(fp);

		/* we may have concurrently written entries from others.
		 * load them */
		st_temp = new_line_input_t(st->flags);
		st_temp->hist_file = st->hist_file;
		st_temp->max_history = st->max_history;
		load_history(st_temp);

		/* write out temp file and replace hist_file atomically */
		new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
		fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
		if (fd >= 0) {
			fp = xfdopen_for_write(fd);
			for (i = 0; i < st_temp->cnt_history; i++)
				fprintf(fp, "%s\n", st_temp->history[i]);
			fclose(fp);
			if (rename(new_name, st->hist_file) == 0)
				st->cnt_history_in_file = st_temp->cnt_history;
		}
		free(new_name);
		free_line_input_t(st_temp);
	}
}
#  else
static void save_history(char *str)
{
	int fd;
	int len, len2;

	if (!state->hist_file)
		return;

	fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
	if (fd < 0)
		return;
	xlseek(fd, 0, SEEK_END); /* paranoia */
	len = strlen(str);
	str[len] = '\n'; /* we (try to) do atomic write */
	len2 = full_write(fd, str, len + 1);
	str[len] = '\0';
	close(fd);
	if (len2 != len + 1)
		return; /* "wtf?" */

	/* did we write so much that history file needs trimming? */
	state->cnt_history_in_file++;
	if (state->cnt_history_in_file > state->max_history * 4) {
		char *new_name;
		line_input_t *st_temp;

		/* we may have concurrently written entries from others.
		 * load them */
		st_temp = new_line_input_t(state->flags);
		st_temp->hist_file = state->hist_file;
		st_temp->max_history = state->max_history;
		load_history(st_temp);

		/* write out temp file and replace hist_file atomically */
		new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
		fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
		if (fd >= 0) {
			FILE *fp;
			int i;

			fp = xfdopen_for_write(fd);
			for (i = 0; i < st_temp->cnt_history; i++)
				fprintf(fp, "%s\n", st_temp->history[i]);
			fclose(fp);
			if (rename(new_name, state->hist_file) == 0)
				state->cnt_history_in_file = st_temp->cnt_history;
		}
		free(new_name);
		free_line_input_t(st_temp);
	}
}
#  endif
# else
#  define load_history(a) ((void)0)
#  define save_history(a) ((void)0)
# endif /* FEATURE_COMMAND_SAVEHISTORY */

static void remember_in_history(char *str)
{
	int i;

	if (!(state->flags & DO_HISTORY))
		return;
	if (str[0] == '\0')
		return;
	i = state->cnt_history;
	/* Don't save dupes */
	if (i && strcmp(state->history[i-1], str) == 0)
		return;

	free(state->history[state->max_history]); /* redundant, paranoia */
	state->history[state->max_history] = NULL; /* redundant, paranoia */

	/* If history[] is full, remove the oldest command */
	/* we need to keep history[state->max_history] empty, hence >=, not > */
	if (i >= state->max_history) {
		free(state->history[0]);
		for (i = 0; i < state->max_history-1; i++)
			state->history[i] = state->history[i+1];
		/* i == state->max_history-1 */
# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
		if (state->cnt_history_in_file)
			state->cnt_history_in_file--;
# endif
	}
	/* i <= state->max_history-1 */
	state->history[i++] = xstrdup(str);
	/* i <= state->max_history */
	state->cur_history = i;
	state->cnt_history = i;
# if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
	save_history(str);
# endif
}

#else /* MAX_HISTORY == 0 */
# define remember_in_history(a) ((void)0)
#endif /* MAX_HISTORY */


#if ENABLE_FEATURE_EDITING_VI
/*
 * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
 */
static void
vi_Word_motion(int eat)
{
	CHAR_T *command = command_ps;

	while (cursor < command_len && !BB_isspace(command[cursor]))
		input_forward();
	if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
		input_forward();
}

static void
vi_word_motion(int eat)
{
	CHAR_T *command = command_ps;

	if (BB_isalnum_or_underscore(command[cursor])) {
		while (cursor < command_len
		 && (BB_isalnum_or_underscore(command[cursor+1]))
		) {
			input_forward();
		}
	} else if (BB_ispunct(command[cursor])) {
		while (cursor < command_len && BB_ispunct(command[cursor+1]))
			input_forward();
	}

	if (cursor < command_len)
		input_forward();

	if (eat) {
		while (cursor < command_len && BB_isspace(command[cursor]))
			input_forward();
	}
}

static void
vi_End_motion(void)
{
	CHAR_T *command = command_ps;

	input_forward();
	while (cursor < command_len && BB_isspace(command[cursor]))
		input_forward();
	while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
		input_forward();
}

static void
vi_end_motion(void)
{
	CHAR_T *command = command_ps;

	if (cursor >= command_len-1)
		return;
	input_forward();
	while (cursor < command_len-1 && BB_isspace(command[cursor]))
		input_forward();
	if (cursor >= command_len-1)
		return;
	if (BB_isalnum_or_underscore(command[cursor])) {
		while (cursor < command_len-1
		 && (BB_isalnum_or_underscore(command[cursor+1]))
		) {
			input_forward();
		}
	} else if (BB_ispunct(command[cursor])) {
		while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
			input_forward();
	}
}

static void
vi_Back_motion(void)
{
	CHAR_T *command = command_ps;

	while (cursor > 0 && BB_isspace(command[cursor-1]))
		input_backward(1);
	while (cursor > 0 && !BB_isspace(command[cursor-1]))
		input_backward(1);
}

static void
vi_back_motion(void)
{
	CHAR_T *command = command_ps;

	if (cursor <= 0)
		return;
	input_backward(1);
	while (cursor > 0 && BB_isspace(command[cursor]))
		input_backward(1);
	if (cursor <= 0)
		return;
	if (BB_isalnum_or_underscore(command[cursor])) {
		while (cursor > 0
		 && (BB_isalnum_or_underscore(command[cursor-1]))
		) {
			input_backward(1);
		}
	} else if (BB_ispunct(command[cursor])) {
		while (cursor > 0 && BB_ispunct(command[cursor-1]))
			input_backward(1);
	}
}
#endif

/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
static void ctrl_left(void)
{
	CHAR_T *command = command_ps;

	while (1) {
		CHAR_T c;

		input_backward(1);
		if (cursor == 0)
			break;
		c = command[cursor];
		if (c != ' ' && !BB_ispunct(c)) {
			/* we reached a "word" delimited by spaces/punct.
			 * go to its beginning */
			while (1) {
				c = command[cursor - 1];
				if (c == ' ' || BB_ispunct(c))
					break;
				input_backward(1);
				if (cursor == 0)
					break;
			}
			break;
		}
	}
}
static void ctrl_right(void)
{
	CHAR_T *command = command_ps;

	while (1) {
		CHAR_T c;

		c = command[cursor];
		if (c == BB_NUL)
			break;
		if (c != ' ' && !BB_ispunct(c)) {
			/* we reached a "word" delimited by spaces/punct.
			 * go to its end + 1 */
			while (1) {
				input_forward();
				c = command[cursor];
				if (c == BB_NUL || c == ' ' || BB_ispunct(c))
					break;
			}
			break;
		}
		input_forward();
	}
}


/*
 * read_line_input and its helpers
 */

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
static void ask_terminal(void)
{
	/* Ask terminal where is the cursor now.
	 * lineedit_read_key handles response and corrects
	 * our idea of current cursor position.
	 * Testcase: run "echo -n long_line_long_line_long_line",
	 * then type in a long, wrapping command and try to
	 * delete it using backspace key.
	 * Note: we print it _after_ prompt, because
	 * prompt may contain CR. Example: PS1='\[\r\n\]\w '
	 */
	/* Problem: if there is buffered input on stdin,
	 * the response will be delivered later,
	 * possibly to an unsuspecting application.
	 * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
	 * Result:
	 * ~/srcdevel/bbox/fix/busybox.t4 #
	 * ~/srcdevel/bbox/fix/busybox.t4 #
	 * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
	 * ~/srcdevel/bbox/fix/busybox.t4 #
	 *
	 * Checking for input with poll only makes the race narrower,
	 * I still can trigger it. Strace:
	 *
	 * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
	 * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
	 * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
	 * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
	 * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
	 */
	struct pollfd pfd;

	pfd.fd = STDIN_FILENO;
	pfd.events = POLLIN;
	if (safe_poll(&pfd, 1, 0) == 0) {
		S.sent_ESC_br6n = 1;
		fputs(ESC"[6n", stdout);
		fflush_all(); /* make terminal see it ASAP! */
	}
}
#else
#define ask_terminal() ((void)0)
#endif

/* Note about multi-line PS1 (e.g. "\n\w \u@\h\n> ") and prompt redrawing:
 *
 * If the prompt has any newlines, after we print it once we use only its last
 * line to redraw in-place, which makes it simpler to calculate how many lines
 * we should move the cursor up to align the redraw (cmdedit_y). The earlier
 * prompt lines just stay on screen and we redraw below them.
 *
 * Use cases for all prompt lines beyond the initial draw:
 * - After clear-screen (^L) or after displaying tab-completion choices, we
 *   print the full prompt, as it isn't redrawn in-place.
 * - During terminal resize we could try to redraw all lines, but we don't,
 *   because it requires delicate alignment, it's good enough with only the
 *   last line, and doing it wrong is arguably worse than not doing it at all.
 *
 * Terminology wise, if it doesn't mention "full", then it means the last/sole
 * prompt line. We use the prompt (last/sole line) while redrawing in-place,
 * and the full where we need a fresh one unrelated to an earlier position.
 *
 * If PS1 is not multiline, the last/sole line and the full are the same string.
 */

/* Called just once at read_line_input() init time */
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
static void parse_and_put_prompt(const char *prmt_ptr)
{
	const char *p;
	cmdedit_prompt = prompt_last_line = prmt_ptr;
	p = strrchr(prmt_ptr, '\n');
	if (p)
		prompt_last_line = p + 1;
	cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
	put_prompt();
}
#else
static void parse_and_put_prompt(const char *prmt_ptr)
{
	int prmt_size = 0;
	char *prmt_mem_ptr = xzalloc(1);
# if ENABLE_USERNAME_OR_HOMEDIR
	char *cwd_buf = NULL;
# endif
	char flg_not_length = '[';
	char cbuf[2];

	/*cmdedit_prmt_len = 0; - already is */

	cbuf[1] = '\0'; /* never changes */

	while (*prmt_ptr) {
		char timebuf[sizeof("HH:MM:SS")];
		char *free_me = NULL;
		char *pbuf;
		char c;

		pbuf = cbuf;
		c = *prmt_ptr++;
		if (c == '\\') {
			const char *cp;
			int l;
/*
 * Supported via bb_process_escape_sequence:
 * \a	ASCII bell character (07)
 * \e	ASCII escape character (033)
 * \n	newline
 * \r	carriage return
 * \\	backslash
 * \nnn	char with octal code nnn
 * Supported:
 * \$	if the effective UID is 0, a #, otherwise a $
 * \w	current working directory, with $HOME abbreviated with a tilde
 *	Note: we do not support $PROMPT_DIRTRIM=n feature
 * \W	basename of the current working directory, with $HOME abbreviated with a tilde
 * \h	hostname up to the first '.'
 * \H	hostname
 * \u	username
 * \[	begin a sequence of non-printing characters
 * \]	end a sequence of non-printing characters
 * \T	current time in 12-hour HH:MM:SS format
 * \@	current time in 12-hour am/pm format
 * \A	current time in 24-hour HH:MM format
 * \t	current time in 24-hour HH:MM:SS format
 *	(all of the above work as \A)
 * Not supported:
 * \!	history number of this command
 * \#	command number of this command
 * \j	number of jobs currently managed by the shell
 * \l	basename of the shell's terminal device name
 * \s	name of the shell, the basename of $0 (the portion following the final slash)
 * \V	release of bash, version + patch level (e.g., 2.00.0)
 * \d	date in "Weekday Month Date" format (e.g., "Tue May 26")
 * \D{format}
 *	format is passed to strftime(3).
 *	An empty format results in a locale-specific time representation.
 *	The braces are required.
 * Mishandled by bb_process_escape_sequence:
 * \v	version of bash (e.g., 2.00)
 */
			cp = prmt_ptr;
			c = *cp;
			if (c != 't') /* don't treat \t as tab */
				c = bb_process_escape_sequence(&prmt_ptr);
			if (prmt_ptr == cp) {
				if (*cp == '\0')
					break;
				c = *prmt_ptr++;

				switch (c) {
# if ENABLE_USERNAME_OR_HOMEDIR
				case 'u':
					pbuf = user_buf ? user_buf : (char*)"";
					break;
# endif
				case 'H':
				case 'h':
					pbuf = free_me = safe_gethostname();
					if (c == 'h')
						strchrnul(pbuf, '.')[0] = '\0';
					break;
				case '$':
					c = (geteuid() == 0 ? '#' : '$');
					break;
				case 'T': /* 12-hour HH:MM:SS format */
				case '@': /* 12-hour am/pm format */
				case 'A': /* 24-hour HH:MM format */
				case 't': /* 24-hour HH:MM:SS format */
					/* We show all of them as 24-hour HH:MM */
					strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
					pbuf = timebuf;
					break;
# if ENABLE_USERNAME_OR_HOMEDIR
				case 'w': /* current dir */
				case 'W': /* basename of cur dir */
					if (!cwd_buf) {
						cwd_buf = xrealloc_getcwd_or_warn(NULL);
						if (!cwd_buf)
							cwd_buf = (char *)bb_msg_unknown;
						else if (home_pwd_buf[0]) {
							char *after_home_user;

							/* /home/user[/something] -> ~[/something] */
							after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
							if (after_home_user
							 && (*after_home_user == '/' || *after_home_user == '\0')
							) {
								cwd_buf[0] = '~';
								overlapping_strcpy(cwd_buf + 1, after_home_user);
							}
						}
					}
					pbuf = cwd_buf;
					if (c == 'w')
						break;
					cp = strrchr(pbuf, '/');
					if (cp)
						pbuf = (char*)cp + 1;
					break;
# endif
// bb_process_escape_sequence does this now:
//				case 'e': case 'E':     /* \e \E = \033 */
//					c = '\033';
//					break;
				case 'x': case 'X': {
					char buf2[4];
					for (l = 0; l < 3;) {
						unsigned h;
						buf2[l++] = *prmt_ptr;
						buf2[l] = '\0';
						h = strtoul(buf2, &pbuf, 16);
						if (h > UCHAR_MAX || (pbuf - buf2) < l) {
							buf2[--l] = '\0';
							break;
						}
						prmt_ptr++;
					}
					c = (char)strtoul(buf2, NULL, 16);
					if (c == 0)
						c = '?';
					pbuf = cbuf;
					break;
				}
				case '[': case ']':
					if (c == flg_not_length) {
						/* Toggle '['/']' hex 5b/5d */
						flg_not_length ^= 6;
						continue;
					}
					break;
				} /* switch */
			} /* if */
		} /* if */
		cbuf[0] = c;
		{
			int n = strlen(pbuf);
			prmt_size += n;
			if (c == '\n')
				cmdedit_prmt_len = 0;
			else if (flg_not_length != ']') {
#if 0 /*ENABLE_UNICODE_SUPPORT*/
/* Won't work, pbuf is one BYTE string here instead of an one Unicode char string. */
/* FIXME */
				cmdedit_prmt_len += unicode_strwidth(pbuf);
#else
				cmdedit_prmt_len += n;
#endif
			}
		}
		prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
		free(free_me);
	} /* while */

# if ENABLE_USERNAME_OR_HOMEDIR
	if (cwd_buf != (char *)bb_msg_unknown)
		free(cwd_buf);
# endif
	/* see comment (above this function) about multiline prompt redrawing */
	cmdedit_prompt = prompt_last_line = prmt_mem_ptr;
	prmt_ptr = strrchr(cmdedit_prompt, '\n');
	if (prmt_ptr)
		prompt_last_line = prmt_ptr + 1;
	put_prompt();
}
#endif

static void cmdedit_setwidth(void)
{
	int new_y;

	cmdedit_termw = get_terminal_width(STDIN_FILENO);
	/* new y for current cursor */
	new_y = (cursor + cmdedit_prmt_len) / cmdedit_termw;
	/* redraw */
	redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
}

static void win_changed(int nsig UNUSED_PARAM)
{
	if (S.ok_to_redraw) {
		/* We are in read_key(), safe to redraw immediately */
		int sv_errno = errno;
		cmdedit_setwidth();
		fflush_all();
		errno = sv_errno;
	} else {
		/* Signal main loop that redraw is necessary */
		S.SIGWINCH_count++;
	}
}

static int lineedit_read_key(char *read_key_buffer, int timeout)
{
	int64_t ic;
#if ENABLE_UNICODE_SUPPORT
	char unicode_buf[MB_CUR_MAX + 1];
	int unicode_idx = 0;
#endif

	fflush_all();
	while (1) {
		/* Wait for input. TIMEOUT = -1 makes read_key wait even
		 * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
		 * insist on full MB_CUR_MAX buffer to declare input like
		 * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
		 *
		 * Note: read_key sets errno to 0 on success.
		 */
		S.ok_to_redraw = 1;
		ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
		S.ok_to_redraw = 0;
		if (errno) {
#if ENABLE_UNICODE_SUPPORT
			if (errno == EAGAIN && unicode_idx != 0)
				goto pushback;
#endif
			break;
		}

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
		if ((int32_t)ic == KEYCODE_CURSOR_POS
		 && S.sent_ESC_br6n
		) {
			S.sent_ESC_br6n = 0;
			if (cursor == 0) { /* otherwise it may be bogus */
				int col = ((ic >> 32) & 0x7fff) - 1;
				/*
				 * Is col > cmdedit_prmt_len?
				 * If yes (terminal says cursor is farther to the right
				 * of where we think it should be),
				 * the prompt wasn't printed starting at col 1,
				 * there was additional text before it.
				 */
				if ((int)(col - cmdedit_prmt_len) > 0) {
					/* Fix our understanding of current x position */
					cmdedit_x += (col - cmdedit_prmt_len);
					while (cmdedit_x >= cmdedit_termw) {
						cmdedit_x -= cmdedit_termw;
						cmdedit_y++;
					}
				}
			}
			continue;
		}
#endif

#if ENABLE_UNICODE_SUPPORT
		if (unicode_status == UNICODE_ON) {
			wchar_t wc;

			if ((int32_t)ic < 0) /* KEYCODE_xxx */
				break;
			// TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...

			unicode_buf[unicode_idx++] = ic;
			unicode_buf[unicode_idx] = '\0';
			if (mbstowcs(&wc, unicode_buf, 1) != 1) {
				/* Not (yet?) a valid unicode char */
				if (unicode_idx < MB_CUR_MAX) {
					timeout = 50;
					continue;
				}
 pushback:
				/* Invalid sequence. Save all "bad bytes" except first */
				read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
# if !ENABLE_UNICODE_PRESERVE_BROKEN
				ic = CONFIG_SUBST_WCHAR;
# else
				ic = unicode_mark_raw_byte(unicode_buf[0]);
# endif
			} else {
				/* Valid unicode char, return its code */
				ic = wc;
			}
		}
#endif
		break;
	}

	return ic;
}

#if ENABLE_UNICODE_BIDI_SUPPORT
static int isrtl_str(void)
{
	int idx = cursor;

	while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
		idx++;
	return unicode_bidi_isrtl(command_ps[idx]);
}
#else
# define isrtl_str() 0
#endif

/* leave out the "vi-mode"-only case labels if vi editing isn't
 * configured. */
#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)

/* convert uppercase ascii to equivalent control char, for readability */
#undef CTRL
#define CTRL(a) ((a) & ~0x40)

enum {
	VI_CMDMODE_BIT = 0x40000000,
	/* 0x80000000 bit flags KEYCODE_xxx */
};

#if ENABLE_FEATURE_REVERSE_SEARCH
/* Mimic readline Ctrl-R reverse history search.
 * When invoked, it shows the following prompt:
 * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
 * and typing results in search being performed:
 * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
 * Search is performed by looking at progressively older lines in history.
 * Ctrl-R again searches for the next match in history.
 * Backspace deletes last matched char.
 * Control keys exit search and return to normal editing (at current history line).
 */
static int32_t reverse_i_search(int timeout)
{
	char match_buf[128]; /* for user input */
	char read_key_buffer[KEYCODE_BUFFER_SIZE];
	const char *matched_history_line;
	const char *saved_prompt;
	unsigned saved_prmt_len;
	int32_t ic;

	matched_history_line = NULL;
	read_key_buffer[0] = 0;
	match_buf[0] = '\0';

	/* Save and replace the prompt */
	saved_prompt = prompt_last_line;
	saved_prmt_len = cmdedit_prmt_len;
	goto set_prompt;

	while (1) {
		int h;
		unsigned match_buf_len = strlen(match_buf);

//FIXME: correct timeout? (i.e. count it down?)
		ic = lineedit_read_key(read_key_buffer, timeout);

		switch (ic) {
		case CTRL('R'): /* searching for the next match */
			break;

		case '\b':
		case '\x7f':
			/* Backspace */
			if (unicode_status == UNICODE_ON) {
				while (match_buf_len != 0) {
					uint8_t c = match_buf[--match_buf_len];
					if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
						break; /* yes */
				}
			} else {
				if (match_buf_len != 0)
					match_buf_len--;
			}
			match_buf[match_buf_len] = '\0';
			break;

		default:
			if (ic < ' '
			 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
			 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
			) {
				goto ret;
			}

			/* Append this char */
#if ENABLE_UNICODE_SUPPORT
			if (unicode_status == UNICODE_ON) {
				mbstate_t mbstate = { 0 };
				char buf[MB_CUR_MAX + 1];
				int len = wcrtomb(buf, ic, &mbstate);
				if (len > 0) {
					buf[len] = '\0';
					if (match_buf_len + len < sizeof(match_buf))
						strcpy(match_buf + match_buf_len, buf);
				}
			} else
#endif
			if (match_buf_len < sizeof(match_buf) - 1) {
				match_buf[match_buf_len] = ic;
				match_buf[match_buf_len + 1] = '\0';
			}
			break;
		} /* switch (ic) */

		/* Search in history for match_buf */
		h = state->cur_history;
		if (ic == CTRL('R'))
			h--;
		while (h >= 0) {
			if (state->history[h]) {
				char *match = strstr(state->history[h], match_buf);
				if (match) {
					state->cur_history = h;
					matched_history_line = state->history[h];
					command_len = load_string(matched_history_line);
					cursor = match - matched_history_line;
//FIXME: cursor position for Unicode case

					free((char*)prompt_last_line);
 set_prompt:
					prompt_last_line = xasprintf("(reverse-i-search)'%s': ", match_buf);
					cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
					goto do_redraw;
				}
			}
			h--;
		}

		/* Not found */
		match_buf[match_buf_len] = '\0';
		beep();
		continue;

 do_redraw:
		redraw(cmdedit_y, command_len - cursor);
	} /* while (1) */

 ret:
	if (matched_history_line)
		command_len = load_string(matched_history_line);

	free((char*)prompt_last_line);
	prompt_last_line = saved_prompt;
	cmdedit_prmt_len = saved_prmt_len;
	redraw(cmdedit_y, command_len - cursor);

	return ic;
}
#endif

/* maxsize must be >= 2.
 * Returns:
 * -1 on read errors or EOF, or on bare Ctrl-D,
 * 0  on ctrl-C (the line entered is still returned in 'command'),
 * (in both cases the cursor remains on the input line, '\n' is not printed)
 * >0 length of input string, including terminating '\n'
 */
int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
{
	int len, n;
	int timeout;
#if ENABLE_FEATURE_TAB_COMPLETION
	smallint lastWasTab = 0;
#endif
	smallint break_out = 0;
#if ENABLE_FEATURE_EDITING_VI
	smallint vi_cmdmode = 0;
#endif
	struct termios initial_settings;
	struct termios new_settings;
	char read_key_buffer[KEYCODE_BUFFER_SIZE];

	INIT_S();

	n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
		| TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */
	);
	if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) {
		/* Happens when e.g. stty -echo was run before.
		 * But if ICANON is not set, we don't come here.
		 * (example: interactive python ^Z-backgrounded,
		 * tty is still in "raw mode").
		 */
		parse_and_put_prompt(prompt);
		fflush_all();
		if (fgets(command, maxsize, stdin) == NULL)
			len = -1; /* EOF or error */
		else
			len = strlen(command);
		DEINIT_S();
		return len;
	}

	init_unicode();

// FIXME: audit & improve this
	if (maxsize > MAX_LINELEN)
		maxsize = MAX_LINELEN;
	S.maxsize = maxsize;

	timeout = -1;
	/* Make state->flags == 0 if st is NULL.
	 * With zeroed flags, no other fields are ever referenced.
	 */
	state = (line_input_t*) &const_int_0;
	if (st) {
		state = st;
		timeout = st->timeout;
	}
#if MAX_HISTORY > 0
# if ENABLE_FEATURE_EDITING_SAVEHISTORY
	if (state->hist_file)
		if (state->cnt_history == 0)
			load_history(state);
# endif
	if (state->flags & DO_HISTORY)
		state->cur_history = state->cnt_history;
#endif

	/* prepare before init handlers */
	cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
	command_len = 0;
#if ENABLE_UNICODE_SUPPORT
	command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
#else
	command_ps = command;
	command[0] = '\0';
#endif
#define command command_must_not_be_used

	tcsetattr_stdin_TCSANOW(&new_settings);

#if ENABLE_USERNAME_OR_HOMEDIR
	{
		struct passwd *entry;

		entry = getpwuid(geteuid());
		if (entry) {
			user_buf = xstrdup(entry->pw_name);
			home_pwd_buf = xstrdup(entry->pw_dir);
		}
	}
#endif

#if 0
	for (i = 0; i <= state->max_history; i++)
		bb_error_msg("history[%d]:'%s'", i, state->history[i]);
	bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
#endif

	/* Print out the command prompt, optionally ask where cursor is */
	parse_and_put_prompt(prompt);
	ask_terminal();

	/* Install window resize handler (NB: after *all* init is complete) */
	S.SIGWINCH_handler.sa_handler = win_changed;
	S.SIGWINCH_handler.sa_flags = SA_RESTART;
	sigaction(SIGWINCH, &S.SIGWINCH_handler, &S.SIGWINCH_handler);

	cmdedit_termw = get_terminal_width(STDIN_FILENO);

	read_key_buffer[0] = 0;
	while (1) {
		/*
		 * The emacs and vi modes share much of the code in the big
		 * command loop.  Commands entered when in vi's command mode
		 * (aka "escape mode") get an extra bit added to distinguish
		 * them - this keeps them from being self-inserted. This
		 * clutters the big switch a bit, but keeps all the code
		 * in one place.
		 */
		int32_t ic, ic_raw;
		unsigned count;

		count = S.SIGWINCH_count;
		if (S.SIGWINCH_saved != count) {
			S.SIGWINCH_saved = count;
			cmdedit_setwidth();
		}

		ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);

#if ENABLE_FEATURE_REVERSE_SEARCH
 again:
#endif
#if ENABLE_FEATURE_EDITING_VI
		newdelflag = 1;
		if (vi_cmdmode) {
			/* btw, since KEYCODE_xxx are all < 0, this doesn't
			 * change ic if it contains one of them: */
			ic |= VI_CMDMODE_BIT;
		}
#endif

		switch (ic) {
		case '\n':
		case '\r':
		vi_case('\n'|VI_CMDMODE_BIT:)
		vi_case('\r'|VI_CMDMODE_BIT:)
			/* Enter */
			goto_new_line();
			break_out = 1;
			break;
		case CTRL('A'):
		vi_case('0'|VI_CMDMODE_BIT:)
			/* Control-a -- Beginning of line */
			input_backward(cursor);
			break;
		case CTRL('B'):
		vi_case('h'|VI_CMDMODE_BIT:)
		vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
		vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
			input_backward(1); /* Move back one character */
			break;
		case CTRL('E'):
		vi_case('$'|VI_CMDMODE_BIT:)
			/* Control-e -- End of line */
			put_till_end_and_adv_cursor();
			break;
		case CTRL('F'):
		vi_case('l'|VI_CMDMODE_BIT:)
		vi_case(' '|VI_CMDMODE_BIT:)
			input_forward(); /* Move forward one character */
			break;
		case '\b':   /* ^H */
		case '\x7f': /* DEL */
			if (!isrtl_str())
				input_backspace();
			else
				input_delete(0);
			break;
		case KEYCODE_DELETE:
			if (!isrtl_str())
				input_delete(0);
			else
				input_backspace();
			break;
#if ENABLE_FEATURE_TAB_COMPLETION
		case '\t':
			input_tab(&lastWasTab);
			break;
#endif
		case CTRL('K'):
			/* Control-k -- clear to end of line */
			command_ps[cursor] = BB_NUL;
			command_len = cursor;
			printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
			break;
		case CTRL('L'):
		vi_case(CTRL('L')|VI_CMDMODE_BIT:)
			/* Control-l -- clear screen */
			/* cursor to top,left; clear to the end of screen */
			printf(ESC"[H" ESC"[J");
			draw_full(command_len - cursor);
			break;
#if MAX_HISTORY > 0
		case CTRL('N'):
		vi_case(CTRL('N')|VI_CMDMODE_BIT:)
		vi_case('j'|VI_CMDMODE_BIT:)
			/* Control-n -- Get next command in history */
			if (get_next_history())
				goto rewrite_line;
			break;
		case CTRL('P'):
		vi_case(CTRL('P')|VI_CMDMODE_BIT:)
		vi_case('k'|VI_CMDMODE_BIT:)
			/* Control-p -- Get previous command from history */
			if (get_previous_history())
				goto rewrite_line;
			break;
#endif
		case CTRL('U'):
		vi_case(CTRL('U')|VI_CMDMODE_BIT:)
			/* Control-U -- Clear line before cursor */
			if (cursor) {
				command_len -= cursor;
				memmove(command_ps, command_ps + cursor,
					(command_len + 1) * sizeof(command_ps[0]));
				redraw(cmdedit_y, command_len);
			}
			break;
		case CTRL('W'):
		vi_case(CTRL('W')|VI_CMDMODE_BIT:)
			/* Control-W -- Remove the last word */
			while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
				input_backspace();
			while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
				input_backspace();
			break;
		case KEYCODE_ALT_D: {
			/* Delete word forward */
			int nc, sc = cursor;
			ctrl_right();
			nc = cursor - sc;
			input_backward(nc);
			while (--nc >= 0)
				input_delete(1);
			break;
		}
		case KEYCODE_ALT_BACKSPACE: {
			/* Delete word backward */
			int sc = cursor;
			ctrl_left();
			while (sc-- > cursor)
				input_delete(1);
			break;
		}
#if ENABLE_FEATURE_REVERSE_SEARCH
		case CTRL('R'):
			ic = ic_raw = reverse_i_search(timeout);
			goto again;
#endif

#if ENABLE_FEATURE_EDITING_VI
		case 'i'|VI_CMDMODE_BIT:
			vi_cmdmode = 0;
			break;
		case 'I'|VI_CMDMODE_BIT:
			input_backward(cursor);
			vi_cmdmode = 0;
			break;
		case 'a'|VI_CMDMODE_BIT:
			input_forward();
			vi_cmdmode = 0;
			break;
		case 'A'|VI_CMDMODE_BIT:
			put_till_end_and_adv_cursor();
			vi_cmdmode = 0;
			break;
		case 'x'|VI_CMDMODE_BIT:
			input_delete(1);
			break;
		case 'X'|VI_CMDMODE_BIT:
			if (cursor > 0) {
				input_backward(1);
				input_delete(1);
			}
			break;
		case 'W'|VI_CMDMODE_BIT:
			vi_Word_motion(1);
			break;
		case 'w'|VI_CMDMODE_BIT:
			vi_word_motion(1);
			break;
		case 'E'|VI_CMDMODE_BIT:
			vi_End_motion();
			break;
		case 'e'|VI_CMDMODE_BIT:
			vi_end_motion();
			break;
		case 'B'|VI_CMDMODE_BIT:
			vi_Back_motion();
			break;
		case 'b'|VI_CMDMODE_BIT:
			vi_back_motion();
			break;
		case 'C'|VI_CMDMODE_BIT:
			vi_cmdmode = 0;
			/* fall through */
		case 'D'|VI_CMDMODE_BIT:
			goto clear_to_eol;

		case 'c'|VI_CMDMODE_BIT:
			vi_cmdmode = 0;
			/* fall through */
		case 'd'|VI_CMDMODE_BIT: {
			int nc, sc;

			ic = lineedit_read_key(read_key_buffer, timeout);
			if (errno) /* error */
				goto return_error_indicator;
			if (ic == ic_raw) { /* "cc", "dd" */
				input_backward(cursor);
				goto clear_to_eol;
				break;
			}

			sc = cursor;
			switch (ic) {
			case 'w':
			case 'W':
			case 'e':
			case 'E':
				switch (ic) {
				case 'w':   /* "dw", "cw" */
					vi_word_motion(vi_cmdmode);
					break;
				case 'W':   /* 'dW', 'cW' */
					vi_Word_motion(vi_cmdmode);
					break;
				case 'e':   /* 'de', 'ce' */
					vi_end_motion();
					input_forward();
					break;
				case 'E':   /* 'dE', 'cE' */
					vi_End_motion();
					input_forward();
					break;
				}
				nc = cursor;
				input_backward(cursor - sc);
				while (nc-- > cursor)
					input_delete(1);
				break;
			case 'b':  /* "db", "cb" */
			case 'B':  /* implemented as B */
				if (ic == 'b')
					vi_back_motion();
				else
					vi_Back_motion();
				while (sc-- > cursor)
					input_delete(1);
				break;
			case ' ':  /* "d ", "c " */
				input_delete(1);
				break;
			case '$':  /* "d$", "c$" */
 clear_to_eol:
				while (cursor < command_len)
					input_delete(1);
				break;
			}
			break;
		}
		case 'p'|VI_CMDMODE_BIT:
			input_forward();
			/* fallthrough */
		case 'P'|VI_CMDMODE_BIT:
			put();
			break;
		case 'r'|VI_CMDMODE_BIT:
//FIXME: unicode case?
			ic = lineedit_read_key(read_key_buffer, timeout);
			if (errno) /* error */
				goto return_error_indicator;
			if (ic < ' ' || ic > 255) {
				beep();
			} else {
				command_ps[cursor] = ic;
				bb_putchar(ic);
				bb_putchar('\b');
			}
			break;
		case '\x1b': /* ESC */
			if (state->flags & VI_MODE) {
				/* insert mode --> command mode */
				vi_cmdmode = 1;
				input_backward(1);
			}
			break;
#endif /* FEATURE_COMMAND_EDITING_VI */

#if MAX_HISTORY > 0
		case KEYCODE_UP:
			if (get_previous_history())
				goto rewrite_line;
			beep();
			break;
		case KEYCODE_DOWN:
			if (!get_next_history())
				break;
 rewrite_line:
			/* Rewrite the line with the selected history item */
			/* change command */
			command_len = load_string(state->history[state->cur_history] ?
					state->history[state->cur_history] : "");
			/* redraw and go to eol (bol, in vi) */
			redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
			break;
#endif
		case KEYCODE_RIGHT:
			input_forward();
			break;
		case KEYCODE_LEFT:
			input_backward(1);
			break;
		case KEYCODE_CTRL_LEFT:
		case KEYCODE_ALT_LEFT: /* bash doesn't do it */
			ctrl_left();
			break;
		case KEYCODE_CTRL_RIGHT:
		case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
			ctrl_right();
			break;
		case KEYCODE_HOME:
			input_backward(cursor);
			break;
		case KEYCODE_END:
			put_till_end_and_adv_cursor();
			break;

		default:
			if (initial_settings.c_cc[VINTR] != 0
			 && ic_raw == initial_settings.c_cc[VINTR]
			) {
				/* Ctrl-C (usually) - stop gathering input */
				command_len = 0;
				break_out = -1; /* "do not append '\n'" */
				break;
			}
			if (initial_settings.c_cc[VEOF] != 0
			 && ic_raw == initial_settings.c_cc[VEOF]
			) {
				/* Ctrl-D (usually) - delete one character,
				 * or exit if len=0 and no chars to delete */
				if (command_len == 0) {
					errno = 0;

		case -1: /* error (e.g. EIO when tty is destroyed) */
 IF_FEATURE_EDITING_VI(return_error_indicator:)
					break_out = command_len = -1;
					break;
				}
				input_delete(0);
				break;
			}
//			/* Control-V -- force insert of next char */
//			if (c == CTRL('V')) {
//				if (safe_read(STDIN_FILENO, &c, 1) < 1)
//					goto return_error_indicator;
//				if (c == 0) {
//					beep();
//					break;
//				}
//			}
			if (ic < ' '
			 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
			 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
			) {
				/* If VI_CMDMODE_BIT is set, ic is >= 256
				 * and vi mode ignores unexpected chars.
				 * Otherwise, we are here if ic is a
				 * control char or an unhandled ESC sequence,
				 * which is also ignored.
				 */
				break;
			}
			if ((int)command_len >= (maxsize - 2)) {
				/* Not enough space for the char and EOL */
				break;
			}

			command_len++;
			if (cursor == (command_len - 1)) {
				/* We are at the end, append */
				command_ps[cursor] = ic;
				command_ps[cursor + 1] = BB_NUL;
				put_cur_glyph_and_inc_cursor();
				if (unicode_bidi_isrtl(ic))
					input_backward(1);
			} else {
				/* In the middle, insert */
				int sc = cursor;

				memmove(command_ps + sc + 1, command_ps + sc,
					(command_len - sc) * sizeof(command_ps[0]));
				command_ps[sc] = ic;
				/* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
				if (!isrtl_str())
					sc++; /* no */
				put_till_end_and_adv_cursor();
				/* to prev x pos + 1 */
				input_backward(cursor - sc);
			}
			break;
		} /* switch (ic) */

		if (break_out)
			break;

#if ENABLE_FEATURE_TAB_COMPLETION
		if (ic_raw != '\t')
			lastWasTab = 0;
#endif
	} /* while (1) */

#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
	if (S.sent_ESC_br6n) {
		/* "sleep 1; busybox ash" + hold [Enter] to trigger.
		 * We sent "ESC [ 6 n", but got '\n' first, and
		 * KEYCODE_CURSOR_POS response is now buffered from terminal.
		 * It's bad already and not much can be done with it
		 * (it _will_ be visible for the next process to read stdin),
		 * but without this delay it even shows up on the screen
		 * as garbage because we restore echo settings with tcsetattr
		 * before it comes in. UGLY!
		 */
		usleep(20*1000);
	}
#endif

/* End of bug-catching "command_must_not_be_used" trick */
#undef command

#if ENABLE_UNICODE_SUPPORT
	command[0] = '\0';
	if (command_len > 0)
		command_len = save_string(command, maxsize - 1);
	free(command_ps);
#endif

	if (command_len > 0) {
		remember_in_history(command);
	}

	if (break_out > 0) {
		command[command_len++] = '\n';
		command[command_len] = '\0';
	}

#if ENABLE_FEATURE_TAB_COMPLETION
	free_tab_completion_data();
#endif

	/* restore initial_settings */
	tcsetattr_stdin_TCSANOW(&initial_settings);
	/* restore SIGWINCH handler */
	sigaction_set(SIGWINCH, &S.SIGWINCH_handler);
	fflush_all();

	len = command_len;
	DEINIT_S();

	return len; /* can't return command_len, DEINIT_S() destroys it */
}

#else  /* !FEATURE_EDITING */

#undef read_line_input
int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
{
	fputs(prompt, stdout);
	fflush_all();
	if (!fgets(command, maxsize, stdin))
		return -1;
	return strlen(command);
}

#endif  /* !FEATURE_EDITING */


/*
 * Testing
 */

#ifdef TEST

#include <locale.h>

const char *applet_name = "debug stuff usage";

int main(int argc, char **argv)
{
	char buff[MAX_LINELEN];
	char *prompt =
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
		"\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
		"\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
		"\\!\\[\\e[36;1m\\]\\$ \\[\\E[m\\]";
#else
		"% ";
#endif

	while (1) {
		int l;
		l = read_line_input(prompt, buff);
		if (l <= 0 || buff[l-1] != '\n')
			break;
		buff[l-1] = '\0';
		printf("*** read_line_input() returned line =%s=\n", buff);
	}
	printf("*** read_line_input() detect ^D\n");
	return 0;
}

#endif  /* TEST */