summaryrefslogtreecommitdiff
path: root/common/main.c
blob: 212452681939c163dc9a6010a6d2e858b2f8dfb2 (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
/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Add to readline cmdline-editing by
 * (C) Copyright 2005
 * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* #define	DEBUG	*/

#include <common.h>
#include <watchdog.h>
#include <command.h>
#ifdef CONFIG_MODEM_SUPPORT
#include <malloc.h>		/* for free() prototype */
#endif

#ifdef CONFIG_SYS_HUSH_PARSER
#include <hush.h>
#endif

#include <post.h>

#if defined(CONFIG_SILENT_CONSOLE) || defined(CONFIG_POST) || defined(CONFIG_CMDLINE_EDITING)
DECLARE_GLOBAL_DATA_PTR;
#endif

/*
 * Board-specific Platform code can reimplement show_boot_progress () if needed
 */
void inline __show_boot_progress (int val) {}
void show_boot_progress (int val) __attribute__((weak, alias("__show_boot_progress")));

#if defined(CONFIG_UPDATE_TFTP)
void update_tftp (void);
#endif /* CONFIG_UPDATE_TFTP */

#define MAX_DELAY_STOP_STR 32

#undef DEBUG_PARSER

char        console_buffer[CONFIG_SYS_CBSIZE + 1];	/* console I/O buffer	*/

static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen);
static const char erase_seq[] = "\b \b";		/* erase sequence	*/
static const char   tab_seq[] = "        ";		/* used to expand TABs	*/

#ifdef CONFIG_BOOT_RETRY_TIME
static uint64_t endtime = 0;  /* must be set, default is instant timeout */
static int      retry_time = -1; /* -1 so can call readline before main_loop */
#endif

#define	endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())

#ifndef CONFIG_BOOT_RETRY_MIN
#define CONFIG_BOOT_RETRY_MIN CONFIG_BOOT_RETRY_TIME
#endif

#ifdef CONFIG_MODEM_SUPPORT
int do_mdm_init = 0;
extern void mdm_init(void); /* defined in board.c */
#endif

/***************************************************************************
 * Watch for 'delay' seconds for autoboot stop or autoboot delay string.
 * returns: 0 -  no key string, allow autoboot
 *          1 - got key string, abort
 */
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
# if defined(CONFIG_AUTOBOOT_KEYED)
static inline int abortboot(int bootdelay)
{
	int abort = 0;
	uint64_t etime = endtick(bootdelay);
	struct {
		char* str;
		u_int len;
		int retry;
	}
	delaykey [] = {
		{ str: getenv ("bootdelaykey"),  retry: 1 },
		{ str: getenv ("bootdelaykey2"), retry: 1 },
		{ str: getenv ("bootstopkey"),   retry: 0 },
		{ str: getenv ("bootstopkey2"),  retry: 0 },
	};

	char presskey [MAX_DELAY_STOP_STR];
	u_int presskey_len = 0;
	u_int presskey_max = 0;
	u_int i;

#  ifdef CONFIG_AUTOBOOT_PROMPT
	printf(CONFIG_AUTOBOOT_PROMPT);
#  endif

#  ifdef CONFIG_AUTOBOOT_DELAY_STR
	if (delaykey[0].str == NULL)
		delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
#  endif
#  ifdef CONFIG_AUTOBOOT_DELAY_STR2
	if (delaykey[1].str == NULL)
		delaykey[1].str = CONFIG_AUTOBOOT_DELAY_STR2;
#  endif
#  ifdef CONFIG_AUTOBOOT_STOP_STR
	if (delaykey[2].str == NULL)
		delaykey[2].str = CONFIG_AUTOBOOT_STOP_STR;
#  endif
#  ifdef CONFIG_AUTOBOOT_STOP_STR2
	if (delaykey[3].str == NULL)
		delaykey[3].str = CONFIG_AUTOBOOT_STOP_STR2;
#  endif

	for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i ++) {
		delaykey[i].len = delaykey[i].str == NULL ?
				    0 : strlen (delaykey[i].str);
		delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ?
				    MAX_DELAY_STOP_STR : delaykey[i].len;

		presskey_max = presskey_max > delaykey[i].len ?
				    presskey_max : delaykey[i].len;

#  if DEBUG_BOOTKEYS
		printf("%s key:<%s>\n",
		       delaykey[i].retry ? "delay" : "stop",
		       delaykey[i].str ? delaykey[i].str : "NULL");
#  endif
	}

	/* In order to keep up with incoming data, check timeout only
	 * when catch up.
	 */
	do {
		if (tstc()) {
			if (presskey_len < presskey_max) {
				presskey [presskey_len ++] = getc();
			}
			else {
				for (i = 0; i < presskey_max - 1; i ++)
					presskey [i] = presskey [i + 1];

				presskey [i] = getc();
			}
		}

		for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i ++) {
			if (delaykey[i].len > 0 &&
			    presskey_len >= delaykey[i].len &&
			    memcmp (presskey + presskey_len - delaykey[i].len,
				    delaykey[i].str,
				    delaykey[i].len) == 0) {
#  if DEBUG_BOOTKEYS
				printf("got %skey\n",
				       delaykey[i].retry ? "delay" : "stop");
#  endif

#  ifdef CONFIG_BOOT_RETRY_TIME
				/* don't retry auto boot */
				if (! delaykey[i].retry)
					retry_time = -1;
#  endif
				abort = 1;
			}
		}
	} while (!abort && get_ticks() <= etime);

#  if DEBUG_BOOTKEYS
	if (!abort)
		puts("key timeout\n");
#  endif

#ifdef CONFIG_SILENT_CONSOLE
	if (abort)
		gd->flags &= ~GD_FLG_SILENT;
#endif

	return abort;
}

# else	/* !defined(CONFIG_AUTOBOOT_KEYED) */

#ifdef CONFIG_MENUKEY
static int menukey = 0;
#endif

static inline int abortboot(int bootdelay)
{
	int abort = 0;

#ifdef CONFIG_MENUPROMPT
	printf(CONFIG_MENUPROMPT);
#else
	printf("Hit any key to stop autoboot: %2d ", bootdelay);
#endif

#if defined CONFIG_ZERO_BOOTDELAY_CHECK
	/*
	 * Check if key already pressed
	 * Don't check if bootdelay < 0
	 */
	if (bootdelay >= 0) {
		if (tstc()) {	/* we got a key press	*/
			(void) getc();  /* consume input	*/
			puts ("\b\b\b 0");
			abort = 1;	/* don't auto boot	*/
		}
	}
#endif

	while ((bootdelay > 0) && (!abort)) {
		int i;

		--bootdelay;
		/* delay 100 * 10ms */
		for (i=0; !abort && i<100; ++i) {
			if (tstc()) {	/* we got a key press	*/
				abort  = 1;	/* don't auto boot	*/
				bootdelay = 0;	/* no more delay	*/
# ifdef CONFIG_MENUKEY
				menukey = getc();
# else
				(void) getc();  /* consume input	*/
# endif
				break;
			}
			udelay(10000);
		}

		printf("\b\b\b%2d ", bootdelay);
	}

	putc('\n');

#ifdef CONFIG_SILENT_CONSOLE
	if (abort)
		gd->flags &= ~GD_FLG_SILENT;
#endif

	return abort;
}
# endif	/* CONFIG_AUTOBOOT_KEYED */
#endif	/* CONFIG_BOOTDELAY >= 0  */

/****************************************************************************/

void main_loop (void)
{
#ifndef CONFIG_SYS_HUSH_PARSER
	static char lastcommand[CONFIG_SYS_CBSIZE] = { 0, };
	int len;
	int rc = 1;
	int flag;
#endif

#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
	char *s;
	int bootdelay;
#endif
#ifdef CONFIG_PREBOOT
	char *p;
#endif
#ifdef CONFIG_BOOTCOUNT_LIMIT
	unsigned long bootcount = 0;
	unsigned long bootlimit = 0;
	char *bcs;
	char bcs_set[16];
#endif /* CONFIG_BOOTCOUNT_LIMIT */

#ifdef CONFIG_BOOTCOUNT_LIMIT
	bootcount = bootcount_load();
	bootcount++;
	bootcount_store (bootcount);
	sprintf (bcs_set, "%lu", bootcount);
	setenv ("bootcount", bcs_set);
	bcs = getenv ("bootlimit");
	bootlimit = bcs ? simple_strtoul (bcs, NULL, 10) : 0;
#endif /* CONFIG_BOOTCOUNT_LIMIT */

#ifdef CONFIG_MODEM_SUPPORT
	debug ("DEBUG: main_loop:   do_mdm_init=%d\n", do_mdm_init);
	if (do_mdm_init) {
		char *str = strdup(getenv("mdm_cmd"));
		setenv ("preboot", str);  /* set or delete definition */
		if (str != NULL)
			free (str);
		mdm_init(); /* wait for modem connection */
	}
#endif  /* CONFIG_MODEM_SUPPORT */

#ifdef CONFIG_VERSION_VARIABLE
	{
		extern char version_string[];

		setenv ("ver", version_string);  /* set version variable */
	}
#endif /* CONFIG_VERSION_VARIABLE */

#ifdef CONFIG_SYS_HUSH_PARSER
	u_boot_hush_start ();
#endif

#if defined(CONFIG_HUSH_INIT_VAR)
	hush_init_var ();
#endif

#ifdef CONFIG_PREBOOT
	if ((p = getenv ("preboot")) != NULL) {
# ifdef CONFIG_AUTOBOOT_KEYED
		int prev = disable_ctrlc(1);	/* disable Control C checking */
# endif

# ifndef CONFIG_SYS_HUSH_PARSER
		run_command (p, 0);
# else
		parse_string_outer(p, FLAG_PARSE_SEMICOLON |
				    FLAG_EXIT_FROM_LOOP);
# endif

# ifdef CONFIG_AUTOBOOT_KEYED
		disable_ctrlc(prev);	/* restore Control C checking */
# endif
	}
#endif /* CONFIG_PREBOOT */

#if defined(CONFIG_UPDATE_TFTP)
	update_tftp ();
#endif /* CONFIG_UPDATE_TFTP */

#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
	s = getenv ("bootdelay");
	bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;

	debug ("### main_loop entered: bootdelay=%d\n\n", bootdelay);

# ifdef CONFIG_BOOT_RETRY_TIME
	init_cmd_timeout ();
# endif	/* CONFIG_BOOT_RETRY_TIME */

#ifdef CONFIG_POST
	if (gd->flags & GD_FLG_POSTFAIL) {
		s = getenv("failbootcmd");
	}
	else
#endif /* CONFIG_POST */
#ifdef CONFIG_BOOTCOUNT_LIMIT
	if (bootlimit && (bootcount > bootlimit)) {
		printf ("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
		        (unsigned)bootlimit);
		s = getenv ("altbootcmd");
	}
	else
#endif /* CONFIG_BOOTCOUNT_LIMIT */
		s = getenv ("bootcmd");

	debug ("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");

	if (bootdelay >= 0 && s && !abortboot (bootdelay)) {
# ifdef CONFIG_AUTOBOOT_KEYED
		int prev = disable_ctrlc(1);	/* disable Control C checking */
# endif

# ifndef CONFIG_SYS_HUSH_PARSER
		run_command (s, 0);
# else
		parse_string_outer(s, FLAG_PARSE_SEMICOLON |
				    FLAG_EXIT_FROM_LOOP);
# endif

# ifdef CONFIG_AUTOBOOT_KEYED
		disable_ctrlc(prev);	/* restore Control C checking */
# endif
	}

# ifdef CONFIG_MENUKEY
	if (menukey == CONFIG_MENUKEY) {
		s = getenv("menucmd");
		if (s) {
# ifndef CONFIG_SYS_HUSH_PARSER
			run_command(s, 0);
# else
			parse_string_outer(s, FLAG_PARSE_SEMICOLON |
						FLAG_EXIT_FROM_LOOP);
# endif
		}
	}
#endif /* CONFIG_MENUKEY */
#endif /* CONFIG_BOOTDELAY */

	/*
	 * Main Loop for Monitor Command Processing
	 */
#ifdef CONFIG_SYS_HUSH_PARSER
	parse_file_outer();
	/* This point is never reached */
	for (;;);
#else
	for (;;) {
#ifdef CONFIG_BOOT_RETRY_TIME
		if (rc >= 0) {
			/* Saw enough of a valid command to
			 * restart the timeout.
			 */
			reset_cmd_timeout();
		}
#endif
		len = readline (CONFIG_SYS_PROMPT);

		flag = 0;	/* assume no special flags for now */
		if (len > 0)
			strcpy (lastcommand, console_buffer);
		else if (len == 0)
			flag |= CMD_FLAG_REPEAT;
#ifdef CONFIG_BOOT_RETRY_TIME
		else if (len == -2) {
			/* -2 means timed out, retry autoboot
			 */
			puts ("\nTimed out waiting for command\n");
# ifdef CONFIG_RESET_TO_RETRY
			/* Reinit board to run initialization code again */
			do_reset (NULL, 0, 0, NULL);
# else
			return;		/* retry autoboot */
# endif
		}
#endif

		if (len == -1)
			puts ("<INTERRUPT>\n");
		else
			rc = run_command (lastcommand, flag);

		if (rc <= 0) {
			/* invalid command or not repeatable, forget it */
			lastcommand[0] = 0;
		}
	}
#endif /*CONFIG_SYS_HUSH_PARSER*/
}

#ifdef CONFIG_BOOT_RETRY_TIME
/***************************************************************************
 * initialize command line timeout
 */
void init_cmd_timeout(void)
{
	char *s = getenv ("bootretry");

	if (s != NULL)
		retry_time = (int)simple_strtol(s, NULL, 10);
	else
		retry_time =  CONFIG_BOOT_RETRY_TIME;

	if (retry_time >= 0 && retry_time < CONFIG_BOOT_RETRY_MIN)
		retry_time = CONFIG_BOOT_RETRY_MIN;
}

/***************************************************************************
 * reset command line timeout to retry_time seconds
 */
void reset_cmd_timeout(void)
{
	endtime = endtick(retry_time);
}
#endif

#ifdef CONFIG_CMDLINE_EDITING

/*
 * cmdline-editing related codes from vivi.
 * Author: Janghoon Lyu <nandy@mizi.com>
 */

#define putnstr(str,n)	do {			\
		printf ("%.*s", (int)n, str);	\
	} while (0)

#define CTL_CH(c)		((c) - 'a' + 1)
#define CTL_BACKSPACE		('\b')
#define DEL			((char)255)
#define DEL7			((char)127)
#define CREAD_HIST_CHAR		('!')

#define getcmd_putch(ch)	putc(ch)
#define getcmd_getch()		getc()
#define getcmd_cbeep()		getcmd_putch('\a')

#define HIST_MAX		20
#define HIST_SIZE		CONFIG_SYS_CBSIZE

static int hist_max = 0;
static int hist_add_idx = 0;
static int hist_cur = -1;
unsigned hist_num = 0;

char* hist_list[HIST_MAX];
char hist_lines[HIST_MAX][HIST_SIZE + 1];	 /* Save room for NULL */

#define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)

static void hist_init(void)
{
	int i;

	hist_max = 0;
	hist_add_idx = 0;
	hist_cur = -1;
	hist_num = 0;

	for (i = 0; i < HIST_MAX; i++) {
		hist_list[i] = hist_lines[i];
		hist_list[i][0] = '\0';
	}
}

static void cread_add_to_hist(char *line)
{
	strcpy(hist_list[hist_add_idx], line);

	if (++hist_add_idx >= HIST_MAX)
		hist_add_idx = 0;

	if (hist_add_idx > hist_max)
		hist_max = hist_add_idx;

	hist_num++;
}

static char* hist_prev(void)
{
	char *ret;
	int old_cur;

	if (hist_cur < 0)
		return NULL;

	old_cur = hist_cur;
	if (--hist_cur < 0)
		hist_cur = hist_max;

	if (hist_cur == hist_add_idx) {
		hist_cur = old_cur;
		ret = NULL;
	} else
		ret = hist_list[hist_cur];

	return (ret);
}

static char* hist_next(void)
{
	char *ret;

	if (hist_cur < 0)
		return NULL;

	if (hist_cur == hist_add_idx)
		return NULL;

	if (++hist_cur > hist_max)
		hist_cur = 0;

	if (hist_cur == hist_add_idx) {
		ret = "";
	} else
		ret = hist_list[hist_cur];

	return (ret);
}

#ifndef CONFIG_CMDLINE_EDITING
static void cread_print_hist_list(void)
{
	int i;
	unsigned long n;

	n = hist_num - hist_max;

	i = hist_add_idx + 1;
	while (1) {
		if (i > hist_max)
			i = 0;
		if (i == hist_add_idx)
			break;
		printf("%s\n", hist_list[i]);
		n++;
		i++;
	}
}
#endif /* CONFIG_CMDLINE_EDITING */

#define BEGINNING_OF_LINE() {			\
	while (num) {				\
		getcmd_putch(CTL_BACKSPACE);	\
		num--;				\
	}					\
}

#define ERASE_TO_EOL() {				\
	if (num < eol_num) {				\
		printf("%*s", (int)(eol_num - num), ""); \
		do {					\
			getcmd_putch(CTL_BACKSPACE);	\
		} while (--eol_num > num);		\
	}						\
}

#define REFRESH_TO_EOL() {			\
	if (num < eol_num) {			\
		wlen = eol_num - num;		\
		putnstr(buf + num, wlen);	\
		num = eol_num;			\
	}					\
}

static void cread_add_char(char ichar, int insert, unsigned long *num,
	       unsigned long *eol_num, char *buf, unsigned long len)
{
	unsigned long wlen;

	/* room ??? */
	if (insert || *num == *eol_num) {
		if (*eol_num > len - 1) {
			getcmd_cbeep();
			return;
		}
		(*eol_num)++;
	}

	if (insert) {
		wlen = *eol_num - *num;
		if (wlen > 1) {
			memmove(&buf[*num+1], &buf[*num], wlen-1);
		}

		buf[*num] = ichar;
		putnstr(buf + *num, wlen);
		(*num)++;
		while (--wlen) {
			getcmd_putch(CTL_BACKSPACE);
		}
	} else {
		/* echo the character */
		wlen = 1;
		buf[*num] = ichar;
		putnstr(buf + *num, wlen);
		(*num)++;
	}
}

static void cread_add_str(char *str, int strsize, int insert, unsigned long *num,
	      unsigned long *eol_num, char *buf, unsigned long len)
{
	while (strsize--) {
		cread_add_char(*str, insert, num, eol_num, buf, len);
		str++;
	}
}

static int cread_line(const char *const prompt, char *buf, unsigned int *len)
{
	unsigned long num = 0;
	unsigned long eol_num = 0;
	unsigned long wlen;
	char ichar;
	int insert = 1;
	int esc_len = 0;
	char esc_save[8];
	int init_len = strlen(buf);

	if (init_len)
		cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);

	while (1) {
#ifdef CONFIG_BOOT_RETRY_TIME
		while (!tstc()) {	/* while no incoming data */
			if (retry_time >= 0 && get_ticks() > endtime)
				return (-2);	/* timed out */
			WATCHDOG_RESET();
		}
#endif

		ichar = getcmd_getch();

		if ((ichar == '\n') || (ichar == '\r')) {
			putc('\n');
			break;
		}

		/*
		 * handle standard linux xterm esc sequences for arrow key, etc.
		 */
		if (esc_len != 0) {
			if (esc_len == 1) {
				if (ichar == '[') {
					esc_save[esc_len] = ichar;
					esc_len = 2;
				} else {
					cread_add_str(esc_save, esc_len, insert,
						      &num, &eol_num, buf, *len);
					esc_len = 0;
				}
				continue;
			}

			switch (ichar) {

			case 'D':	/* <- key */
				ichar = CTL_CH('b');
				esc_len = 0;
				break;
			case 'C':	/* -> key */
				ichar = CTL_CH('f');
				esc_len = 0;
				break;	/* pass off to ^F handler */
			case 'H':	/* Home key */
				ichar = CTL_CH('a');
				esc_len = 0;
				break;	/* pass off to ^A handler */
			case 'A':	/* up arrow */
				ichar = CTL_CH('p');
				esc_len = 0;
				break;	/* pass off to ^P handler */
			case 'B':	/* down arrow */
				ichar = CTL_CH('n');
				esc_len = 0;
				break;	/* pass off to ^N handler */
			default:
				esc_save[esc_len++] = ichar;
				cread_add_str(esc_save, esc_len, insert,
					      &num, &eol_num, buf, *len);
				esc_len = 0;
				continue;
			}
		}

		switch (ichar) {
		case 0x1b:
			if (esc_len == 0) {
				esc_save[esc_len] = ichar;
				esc_len = 1;
			} else {
				puts("impossible condition #876\n");
				esc_len = 0;
			}
			break;

		case CTL_CH('a'):
			BEGINNING_OF_LINE();
			break;
		case CTL_CH('c'):	/* ^C - break */
			*buf = '\0';	/* discard input */
			return (-1);
		case CTL_CH('f'):
			if (num < eol_num) {
				getcmd_putch(buf[num]);
				num++;
			}
			break;
		case CTL_CH('b'):
			if (num) {
				getcmd_putch(CTL_BACKSPACE);
				num--;
			}
			break;
		case CTL_CH('d'):
			if (num < eol_num) {
				wlen = eol_num - num - 1;
				if (wlen) {
					memmove(&buf[num], &buf[num+1], wlen);
					putnstr(buf + num, wlen);
				}

				getcmd_putch(' ');
				do {
					getcmd_putch(CTL_BACKSPACE);
				} while (wlen--);
				eol_num--;
			}
			break;
		case CTL_CH('k'):
			ERASE_TO_EOL();
			break;
		case CTL_CH('e'):
			REFRESH_TO_EOL();
			break;
		case CTL_CH('o'):
			insert = !insert;
			break;
		case CTL_CH('x'):
		case CTL_CH('u'):
			BEGINNING_OF_LINE();
			ERASE_TO_EOL();
			break;
		case DEL:
		case DEL7:
		case 8:
			if (num) {
				wlen = eol_num - num;
				num--;
				memmove(&buf[num], &buf[num+1], wlen);
				getcmd_putch(CTL_BACKSPACE);
				putnstr(buf + num, wlen);
				getcmd_putch(' ');
				do {
					getcmd_putch(CTL_BACKSPACE);
				} while (wlen--);
				eol_num--;
			}
			break;
		case CTL_CH('p'):
		case CTL_CH('n'):
		{
			char * hline;

			esc_len = 0;

			if (ichar == CTL_CH('p'))
				hline = hist_prev();
			else
				hline = hist_next();

			if (!hline) {
				getcmd_cbeep();
				continue;
			}

			/* nuke the current line */
			/* first, go home */
			BEGINNING_OF_LINE();

			/* erase to end of line */
			ERASE_TO_EOL();

			/* copy new line into place and display */
			strcpy(buf, hline);
			eol_num = strlen(buf);
			REFRESH_TO_EOL();
			continue;
		}
#ifdef CONFIG_AUTO_COMPLETE
		case '\t': {
			int num2, col;

			/* do not autocomplete when in the middle */
			if (num < eol_num) {
				getcmd_cbeep();
				break;
			}

			buf[num] = '\0';
			col = strlen(prompt) + eol_num;
			num2 = num;
			if (cmd_auto_complete(prompt, buf, &num2, &col)) {
				col = num2 - num;
				num += col;
				eol_num += col;
			}
			break;
		}
#endif
		default:
			cread_add_char(ichar, insert, &num, &eol_num, buf, *len);
			break;
		}
	}
	*len = eol_num;
	buf[eol_num] = '\0';	/* lose the newline */

	if (buf[0] && buf[0] != CREAD_HIST_CHAR)
		cread_add_to_hist(buf);
	hist_cur = hist_add_idx;

	return 0;
}

#endif /* CONFIG_CMDLINE_EDITING */

/****************************************************************************/

/*
 * Prompt for input and read a line.
 * If  CONFIG_BOOT_RETRY_TIME is defined and retry_time >= 0,
 * time out when time goes past endtime (timebase time in ticks).
 * Return:	number of read characters
 *		-1 if break
 *		-2 if timed out
 */
int readline (const char *const prompt)
{
	/*
	 * If console_buffer isn't 0-length the user will be prompted to modify
	 * it instead of entering it from scratch as desired.
	 */
	console_buffer[0] = '\0';

	return readline_into_buffer(prompt, console_buffer);
}


int readline_into_buffer (const char *const prompt, char * buffer)
{
	char *p = buffer;
#ifdef CONFIG_CMDLINE_EDITING
	unsigned int len = CONFIG_SYS_CBSIZE;
	int rc;
	static int initted = 0;

	/*
	 * History uses a global array which is not
	 * writable until after relocation to RAM.
	 * Revert to non-history version if still
	 * running from flash.
	 */
	if (gd->flags & GD_FLG_RELOC) {
		if (!initted) {
			hist_init();
			initted = 1;
		}

		if (prompt)
			puts (prompt);

		rc = cread_line(prompt, p, &len);
		return rc < 0 ? rc : len;

	} else {
#endif	/* CONFIG_CMDLINE_EDITING */
	char * p_buf = p;
	int	n = 0;				/* buffer index		*/
	int	plen = 0;			/* prompt length	*/
	int	col;				/* output column cnt	*/
	char	c;

	/* print prompt */
	if (prompt) {
		plen = strlen (prompt);
		puts (prompt);
	}
	col = plen;

	for (;;) {
#ifdef CONFIG_BOOT_RETRY_TIME
		while (!tstc()) {	/* while no incoming data */
			if (retry_time >= 0 && get_ticks() > endtime)
				return (-2);	/* timed out */
			WATCHDOG_RESET();
		}
#endif
		WATCHDOG_RESET();		/* Trigger watchdog, if needed */

#ifdef CONFIG_SHOW_ACTIVITY
		while (!tstc()) {
			extern void show_activity(int arg);
			show_activity(0);
			WATCHDOG_RESET();
		}
#endif
		c = getc();

		/*
		 * Special character handling
		 */
		switch (c) {
		case '\r':				/* Enter		*/
		case '\n':
			*p = '\0';
			puts ("\r\n");
			return (p - p_buf);

		case '\0':				/* nul			*/
			continue;

		case 0x03:				/* ^C - break		*/
			p_buf[0] = '\0';	/* discard input */
			return (-1);

		case 0x15:				/* ^U - erase line	*/
			while (col > plen) {
				puts (erase_seq);
				--col;
			}
			p = p_buf;
			n = 0;
			continue;

		case 0x17:				/* ^W - erase word	*/
			p=delete_char(p_buf, p, &col, &n, plen);
			while ((n > 0) && (*p != ' ')) {
				p=delete_char(p_buf, p, &col, &n, plen);
			}
			continue;

		case 0x08:				/* ^H  - backspace	*/
		case 0x7F:				/* DEL - backspace	*/
			p=delete_char(p_buf, p, &col, &n, plen);
			continue;

		default:
			/*
			 * Must be a normal character then
			 */
			if (n < CONFIG_SYS_CBSIZE-2) {
				if (c == '\t') {	/* expand TABs		*/
#ifdef CONFIG_AUTO_COMPLETE
					/* if auto completion triggered just continue */
					*p = '\0';
					if (cmd_auto_complete(prompt, console_buffer, &n, &col)) {
						p = p_buf + n;	/* reset */
						continue;
					}
#endif
					puts (tab_seq+(col&07));
					col += 8 - (col&07);
				} else {
					++col;		/* echo input		*/
					putc (c);
				}
				*p++ = c;
				++n;
			} else {			/* Buffer full		*/
				putc ('\a');
			}
		}
	}
#ifdef CONFIG_CMDLINE_EDITING
	}
#endif
}

/****************************************************************************/

static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen)
{
	char *s;

	if (*np == 0) {
		return (p);
	}

	if (*(--p) == '\t') {			/* will retype the whole line	*/
		while (*colp > plen) {
			puts (erase_seq);
			(*colp)--;
		}
		for (s=buffer; s<p; ++s) {
			if (*s == '\t') {
				puts (tab_seq+((*colp) & 07));
				*colp += 8 - ((*colp) & 07);
			} else {
				++(*colp);
				putc (*s);
			}
		}
	} else {
		puts (erase_seq);
		(*colp)--;
	}
	(*np)--;
	return (p);
}

/****************************************************************************/

int parse_line (char *line, char *argv[])
{
	int nargs = 0;

#ifdef DEBUG_PARSER
	printf ("parse_line: \"%s\"\n", line);
#endif
	while (nargs < CONFIG_SYS_MAXARGS) {

		/* skip any white space */
		while ((*line == ' ') || (*line == '\t')) {
			++line;
		}

		if (*line == '\0') {	/* end of line, no more args	*/
			argv[nargs] = NULL;
#ifdef DEBUG_PARSER
		printf ("parse_line: nargs=%d\n", nargs);
#endif
			return (nargs);
		}

		argv[nargs++] = line;	/* begin of argument string	*/

		/* find end of string */
		while (*line && (*line != ' ') && (*line != '\t')) {
			++line;
		}

		if (*line == '\0') {	/* end of line, no more args	*/
			argv[nargs] = NULL;
#ifdef DEBUG_PARSER
		printf ("parse_line: nargs=%d\n", nargs);
#endif
			return (nargs);
		}

		*line++ = '\0';		/* terminate current arg	 */
	}

	printf ("** Too many args (max. %d) **\n", CONFIG_SYS_MAXARGS);

#ifdef DEBUG_PARSER
	printf ("parse_line: nargs=%d\n", nargs);
#endif
	return (nargs);
}

/****************************************************************************/

static void process_macros (const char *input, char *output)
{
	char c, prev;
	const char *varname_start = NULL;
	int inputcnt = strlen (input);
	int outputcnt = CONFIG_SYS_CBSIZE;
	int state = 0;		/* 0 = waiting for '$'  */

	/* 1 = waiting for '(' or '{' */
	/* 2 = waiting for ')' or '}' */
	/* 3 = waiting for '''  */
#ifdef DEBUG_PARSER
	char *output_start = output;

	printf ("[PROCESS_MACROS] INPUT len %d: \"%s\"\n", strlen (input),
		input);
#endif

	prev = '\0';		/* previous character   */

	while (inputcnt && outputcnt) {
		c = *input++;
		inputcnt--;

		if (state != 3) {
			/* remove one level of escape characters */
			if ((c == '\\') && (prev != '\\')) {
				if (inputcnt-- == 0)
					break;
				prev = c;
				c = *input++;
			}
		}

		switch (state) {
		case 0:	/* Waiting for (unescaped) $    */
			if ((c == '\'') && (prev != '\\')) {
				state = 3;
				break;
			}
			if ((c == '$') && (prev != '\\')) {
				state++;
			} else {
				*(output++) = c;
				outputcnt--;
			}
			break;
		case 1:	/* Waiting for (        */
			if (c == '(' || c == '{') {
				state++;
				varname_start = input;
			} else {
				state = 0;
				*(output++) = '$';
				outputcnt--;

				if (outputcnt) {
					*(output++) = c;
					outputcnt--;
				}
			}
			break;
		case 2:	/* Waiting for )        */
			if (c == ')' || c == '}') {
				int i;
				char envname[CONFIG_SYS_CBSIZE], *envval;
				int envcnt = input - varname_start - 1;	/* Varname # of chars */

				/* Get the varname */
				for (i = 0; i < envcnt; i++) {
					envname[i] = varname_start[i];
				}
				envname[i] = 0;

				/* Get its value */
				envval = getenv (envname);

				/* Copy into the line if it exists */
				if (envval != NULL)
					while ((*envval) && outputcnt) {
						*(output++) = *(envval++);
						outputcnt--;
					}
				/* Look for another '$' */
				state = 0;
			}
			break;
		case 3:	/* Waiting for '        */
			if ((c == '\'') && (prev != '\\')) {
				state = 0;
			} else {
				*(output++) = c;
				outputcnt--;
			}
			break;
		}
		prev = c;
	}

	if (outputcnt)
		*output = 0;
	else
		*(output - 1) = 0;

#ifdef DEBUG_PARSER
	printf ("[PROCESS_MACROS] OUTPUT len %d: \"%s\"\n",
		strlen (output_start), output_start);
#endif
}

/****************************************************************************
 * returns:
 *	1  - command executed, repeatable
 *	0  - command executed but not repeatable, interrupted commands are
 *	     always considered not repeatable
 *	-1 - not executed (unrecognized, bootd recursion or too many args)
 *           (If cmd is NULL or "" or longer than CONFIG_SYS_CBSIZE-1 it is
 *           considered unrecognized)
 *
 * WARNING:
 *
 * We must create a temporary copy of the command since the command we get
 * may be the result from getenv(), which returns a pointer directly to
 * the environment data, which may change magicly when the command we run
 * creates or modifies environment variables (like "bootp" does).
 */

int run_command (const char *cmd, int flag)
{
	cmd_tbl_t *cmdtp;
	char cmdbuf[CONFIG_SYS_CBSIZE];	/* working copy of cmd		*/
	char *token;			/* start of token in cmdbuf	*/
	char *sep;			/* end of token (separator) in cmdbuf */
	char finaltoken[CONFIG_SYS_CBSIZE];
	char *str = cmdbuf;
	char *argv[CONFIG_SYS_MAXARGS + 1];	/* NULL terminated	*/
	int argc, inquotes;
	int repeatable = 1;
	int rc = 0;

#ifdef DEBUG_PARSER
	printf ("[RUN_COMMAND] cmd[%p]=\"", cmd);
	puts (cmd ? cmd : "NULL");	/* use puts - string may be loooong */
	puts ("\"\n");
#endif

	clear_ctrlc();		/* forget any previous Control C */

	if (!cmd || !*cmd) {
		return -1;	/* empty command */
	}

	if (strlen(cmd) >= CONFIG_SYS_CBSIZE) {
		puts ("## Command too long!\n");
		return -1;
	}

	strcpy (cmdbuf, cmd);

	/* Process separators and check for invalid
	 * repeatable commands
	 */

#ifdef DEBUG_PARSER
	printf ("[PROCESS_SEPARATORS] %s\n", cmd);
#endif
	while (*str) {

		/*
		 * Find separator, or string end
		 * Allow simple escape of ';' by writing "\;"
		 */
		for (inquotes = 0, sep = str; *sep; sep++) {
			if ((*sep=='\'') &&
			    (*(sep-1) != '\\'))
				inquotes=!inquotes;

			if (!inquotes &&
			    (*sep == ';') &&	/* separator		*/
			    ( sep != str) &&	/* past string start	*/
			    (*(sep-1) != '\\'))	/* and NOT escaped	*/
				break;
		}

		/*
		 * Limit the token to data between separators
		 */
		token = str;
		if (*sep) {
			str = sep + 1;	/* start of command for next pass */
			*sep = '\0';
		}
		else
			str = sep;	/* no more commands for next pass */
#ifdef DEBUG_PARSER
		printf ("token: \"%s\"\n", token);
#endif

		/* find macros in this token and replace them */
		process_macros (token, finaltoken);

		/* Extract arguments */
		if ((argc = parse_line (finaltoken, argv)) == 0) {
			rc = -1;	/* no command at all */
			continue;
		}

		/* Look up command in command table */
		if ((cmdtp = find_cmd(argv[0])) == NULL) {
			printf ("Unknown command '%s' - try 'help'\n", argv[0]);
			rc = -1;	/* give up after bad command */
			continue;
		}

		/* found - check max args */
		if (argc > cmdtp->maxargs) {
			cmd_usage(cmdtp);
			rc = -1;
			continue;
		}

#if defined(CONFIG_CMD_BOOTD)
		/* avoid "bootd" recursion */
		if (cmdtp->cmd == do_bootd) {
#ifdef DEBUG_PARSER
			printf ("[%s]\n", finaltoken);
#endif
			if (flag & CMD_FLAG_BOOTD) {
				puts ("'bootd' recursion detected\n");
				rc = -1;
				continue;
			} else {
				flag |= CMD_FLAG_BOOTD;
			}
		}
#endif

		/* OK - call function to do the command */
		if ((cmdtp->cmd) (cmdtp, flag, argc, argv) != 0) {
			rc = -1;
		}

		repeatable &= cmdtp->repeatable;

		/* Did the user stop this? */
		if (had_ctrlc ())
			return -1;	/* if stopped then not repeatable */
	}

	return rc ? rc : repeatable;
}

/****************************************************************************/

#if defined(CONFIG_CMD_RUN)
int do_run (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
	int i;

	if (argc < 2)
		return cmd_usage(cmdtp);

	for (i=1; i<argc; ++i) {
		char *arg;

		if ((arg = getenv (argv[i])) == NULL) {
			printf ("## Error: \"%s\" not defined\n", argv[i]);
			return 1;
		}
#ifndef CONFIG_SYS_HUSH_PARSER
		if (run_command (arg, flag) == -1)
			return 1;
#else
		if (parse_string_outer(arg,
		    FLAG_PARSE_SEMICOLON | FLAG_EXIT_FROM_LOOP) != 0)
			return 1;
#endif
	}
	return 0;
}
#endif