summaryrefslogtreecommitdiff
path: root/common/main.c
blob: 5ddecca736684cefb2335759632e23bde744c4d9 (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
/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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>
#include <malloc.h>

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

#if defined(CONFIG_BOOT_RETRY_TIME) && defined(CONFIG_RESET_TO_RETRY)
extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);		/* for do_reset() prototype */
#endif

extern int do_bootd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);


#define MAX_DELAY_STOP_STR 32

static char * delete_char (char *buffer, char *p, int *colp, int *np, int plen);
static int parse_line (char *, char *[]);
#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
static int abortboot(int);
#endif

#undef DEBUG_PARSER

char        console_buffer[CFG_CBSIZE];		/* console I/O buffer	*/

static char erase_seq[] = "\b \b";		/* erase sequence	*/
static 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, bootdelay);
#  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.
	 */
	while (!abort && get_ticks() <= etime) {
		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;
			}
		}

		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();
			}
		}
	}
#  if DEBUG_BOOTKEYS
	if (!abort)
		printf("key timeout\n");
#  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, bootdelay);
#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	*/
			printf ("\b\b\b 0\n");
			return 1; 	/* don't auto boot	*/
		}
	}
#endif

	while (bootdelay > 0) {
		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');

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

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

void main_loop (void)
{
#ifndef CFG_HUSH_PARSER
	static char lastcommand[CFG_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

#if defined(CONFIG_VFD) && defined(VFD_TEST_LOGO)
	ulong bmp = 0;		/* default bitmap */
	extern int trab_vfd (ulong bitmap);

#ifdef CONFIG_MODEM_SUPPORT
	if (do_mdm_init)
		bmp = 1;	/* alternate bitmap */
#endif
	trab_vfd (bmp);
#endif	/* CONFIG_VFD && VFD_TEST_LOGO */

#ifdef CONFIG_MODEM_SUPPORT
	debug ("DEBUG: main_loop:   do_mdm_init=%d\n", do_mdm_init);
	if (do_mdm_init) {
		uchar *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 CFG_HUSH_PARSER
	u_boot_hush_start ();
#endif

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

# ifndef CFG_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_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 */

	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 CFG_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 CFG_HUSH_PARSER
		run_command (s, bd, 0);
# else
		parse_string_outer(s, FLAG_PARSE_SEMICOLON |
				    FLAG_EXIT_FROM_LOOP);
# endif
	    }
	}
#endif /* CONFIG_MENUKEY */
#endif	/* CONFIG_BOOTDELAY */

#ifdef CONFIG_AMIGAONEG3SE
	{
	    extern void video_banner(void);
	    video_banner();
	}
#endif

	/*
	 * Main Loop for Monitor Command Processing
	 */
#ifdef CFG_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 (CFG_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
			 */
			printf("\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)
			printf ("<INTERRUPT>\n");
		else
			rc = run_command (lastcommand, flag);

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

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

	if (s != NULL)
		retry_time = (int)simple_strtoul(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

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

/*
 * 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)
{
	char   *p = console_buffer;
	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 */
		}
#endif
		WATCHDOG_RESET();		/* Trigger watchdog, if needed */

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

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

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

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

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

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

		default:
			/*
			 * Must be a normal character then
			 */
			if (n < CFG_CBSIZE-2) {
				if (c == '\t') {	/* expand TABs		*/
					puts (tab_seq+(col&07));
					col += 8 - (col&07);
				} else {
					++col;		/* echo input		*/
					putc (c);
				}
				*p++ = c;
				++n;
			} else {			/* Buffer full		*/
				putc ('\a');
			}
		}
	}
}

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

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 < CFG_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", CFG_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 = CFG_CBSIZE;
	int state = 0;	/* 0 = waiting for '$'	*/
			/* 1 = waiting for '('	*/
			/* 2 = waiting for ')'	*/
			/* 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 == '$') && (prev != '\\')) {
			state++;
		} else {
			*(output++) = c;
			outputcnt--;
		}
		break;
	    case 1:			/* Waiting for (	*/
		if (c == '(') {
			state++;
			varname_start = input;
		} else {
			state = 0;
			*(output++) = '$';
			outputcnt--;

			if (outputcnt) {
				*(output++) = c;
				outputcnt--;
			}
		}
		break;
	    case 2:			/* Waiting for )	*/
		if (c == ')') {
			int i;
			char envname[CFG_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;

#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 CFG_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[CFG_CBSIZE];	/* working copy of cmd		*/
	char *token;			/* start of token in cmdbuf	*/
	char *sep;			/* end of token (separator) in cmdbuf */
	char finaltoken[CFG_CBSIZE];
	char *str = cmdbuf;
	char *argv[CFG_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) >= CFG_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 */
		argc = parse_line (finaltoken, argv);

		/* 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) {
			printf ("Usage:\n%s\n", cmdtp->usage);
			rc = -1;
			continue;
		}

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

		/* 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 0;	/* if stopped then not repeatable */
	}

	return rc ? rc : repeatable;
}

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

#if (CONFIG_COMMANDS & CFG_CMD_RUN)
int do_run (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	int i;

	if (argc < 2) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}

	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 CFG_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	/* CFG_CMD_RUN */