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
|
/****************************************************************************
* examples/nsh/nsh_main.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sched.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
# include <pthread.h>
#endif
#include "nsh.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Argument list size
*
* argv[0]: The command name.
* argv[1]: The beginning of argument (up to NSH_MAX_ARGUMENTS)
* argv[argc-3]: Possibly '>' or '>>'
* argv[argc-2]: Possibly <file>
* argv[argc-1]: Possibly '&' (if pthreads are enabled)
* argv[argc]: NULL terminating pointer
*
* Maximum size is NSH_MAX_ARGUMENTS+5
*/
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
# define MAX_ARGV_ENTRIES (NSH_MAX_ARGUMENTS+5)
#else
# define MAX_ARGV_ENTRIES (NSH_MAX_ARGUMENTS+4)
#endif
#if CONFIG_RR_INTERVAL > 0
# define SCHED_NSH SCHED_RR
#else
# define SCHED_NSH SCHED_FIFO
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct cmdmap_s
{
const char *cmd; /* Name of the command */
cmd_t handler; /* Function that handles the command */
ubyte minargs; /* Minimum number of arguments (including command) */
ubyte maxargs; /* Maximum number of arguments (including command) */
const char *usage; /* Usage instructions for 'help' command */
};
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
struct cmdarg_s
{
FAR struct nsh_vtbl_s *vtbl; /* For front-end interaction */
int fd; /* FD for output redirection */
int argc; /* Number of arguments in argv */
FAR char *argv[MAX_ARGV_ENTRIES]; /* Argument list */
};
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_delim[] = " \t\n";
static const char g_redirect1[] = ">";
static const char g_redirect2[] = ">>";
static const char g_exitstatus[] = "$?";
static const char g_success[] = "0";
static const char g_failure[] = "1";
static const struct cmdmap_s g_cmdmap[] =
{
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
{ "[", cmd_lbracket, 4, NSH_MAX_ARGUMENTS, "<expression> ]" },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
{ "cat", cmd_cat, 2, NSH_MAX_ARGUMENTS, "<path> [<path> [<path> ...]]" },
#ifndef CONFIG_DISABLE_ENVIRON
{ "cd", cmd_cd, 1, 2, "[<dir-path>|-|~|..]" },
#endif
{ "cp", cmd_cp, 3, 3, "<source-path> <dest-path>" },
#endif
#ifndef CONFIG_DISABLE_ENVIRON
{ "echo", cmd_echo, 0, NSH_MAX_ARGUMENTS, "[<string|$name> [<string|$name>...]]" },
#else
{ "echo", cmd_echo, 0, NSH_MAX_ARGUMENTS, "[<string> [<string>...]]" },
#endif
{ "exec", cmd_exec, 2, 3, "<hex-address>" },
{ "exit", cmd_exit, 1, 1, NULL },
#if defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
{ "get", cmd_get, 4, 7, "[-b|-n] [-f <local-path>] -h <ip-address> <remote-path>" },
#endif
{ "help", cmd_help, 1, 1, NULL },
#ifdef CONFIG_NET
{ "ifconfig", cmd_ifconfig, 1, 1, NULL },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
{ "ls", cmd_ls, 1, 5, "[-lRs] <dir-path>" },
#endif
{ "mb", cmd_mb, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
{ "mem", cmd_mem, 1, 1, NULL },
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
{ "mkdir", cmd_mkdir, 2, 2, "<path>" },
#ifdef CONFIG_FS_FAT
{ "mkfatfs", cmd_mkfatfs, 2, 2, "<path>" },
#endif
{ "mkfifo", cmd_mkfifo, 2, 2, "<path>" },
#endif
{ "mh", cmd_mh, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
#ifdef CONFIG_FS_FAT /* Need at least one filesytem in configuration */
{ "mount", cmd_mount, 4, 5, "-t <fstype> <block-device> <dir-path>" },
#endif
#endif
{ "mw", cmd_mw, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
{ "ps", cmd_ps, 1, 1, NULL },
#if defined(CONFIG_NET) && defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_PING) && \
!defined(CONFIG_DISABLE_CLOCK) && !defined(CONFIG_DISABLE_SIGNALS)
{ "ping", cmd_ping, 2, 6, "[-c <count>] [-i <interval>] <ip-address>" },
#endif
#if defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
{ "put", cmd_put, 4, 7, "[-b|-n] [-f <remote-path>] -h <ip-address> <local-path>" },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
{ "pwd", cmd_pwd, 1, 1, NULL },
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
{ "rm", cmd_rm, 2, 2, "<file-path>" },
{ "rmdir", cmd_rmdir, 2, 2, "<dir-path>" },
#endif
#ifndef CONFIG_DISABLE_ENVIRON
{ "set", cmd_set, 3, 3, "<name> <value>" },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0 && !defined(CONFIG_EXAMPLES_NSH_DISABLESCRIPT)
{ "sh", cmd_sh, 2, 2, "<script-path>" },
#endif /* CONFIG_NFILE_DESCRIPTORS && CONFIG_NFILE_STREAMS */
#ifndef CONFIG_DISABLE_SIGNALS
{ "sleep", cmd_sleep, 2, 2, "<sec>" },
#endif /* CONFIG_DISABLE_SIGNALS */
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
{ "test", cmd_test, 3, NSH_MAX_ARGUMENTS, "<expression>" },
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
# ifdef CONFIG_FS_FAT /* Need at least one filesytem in configuration */
{ "umount", cmd_umount, 2, 2, "<dir-path>" },
# endif
#endif
#ifndef CONFIG_DISABLE_ENVIRON
{ "unset", cmd_unset, 2, 2, "<name>" },
#endif
#ifndef CONFIG_DISABLE_SIGNALS
{ "usleep", cmd_usleep, 2, 2, "<usec>" },
#endif /* CONFIG_DISABLE_SIGNALS */
{ NULL, NULL, 1, 1, NULL }
};
/****************************************************************************
* Public Data
****************************************************************************/
const char g_nshgreeting[] = "NuttShell (NSH)\n";
const char g_nshprompt[] = "nsh> ";
const char g_nshsyntax[] = "nsh: %s: syntax error\n";
const char g_fmtargrequired[] = "nsh: %s: missing required argument(s)\n";
const char g_fmtarginvalid[] = "nsh: %s: argument invalid\n";
const char g_fmtargrange[] = "nsh: %s: value out of range\n";
const char g_fmtcmdnotfound[] = "nsh: %s: command not found\n";
const char g_fmtnosuch[] = "nsh: %s: no such %s: %s\n";
const char g_fmttoomanyargs[] = "nsh: %s: too many arguments\n";
const char g_fmtdeepnesting[] = "nsh: %s: nesting too deep\n";
const char g_fmtcontext[] = "nsh: %s: not valid in this context\n";
#ifdef CONFIG_EXAMPLES_NSH_STRERROR
const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %s\n";
#else
const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %d\n";
#endif
const char g_fmtcmdoutofmemory[] = "nsh: %s: out of memory\n";
const char g_fmtinternalerror[] = "nsh: %s: Internal error\n";
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: cmd_help
****************************************************************************/
static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
const struct cmdmap_s *ptr;
nsh_output(vtbl, "NSH command forms:\n");
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
nsh_output(vtbl, " [nice [-d <niceness>>]] <cmd> [> <file>|>> <file>] [&]\n");
#else
nsh_output(vtbl, " <cmd> [> <file>|>> <file>]\n");
#endif
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
nsh_output(vtbl, "OR\n");
nsh_output(vtbl, " if <cmd>\n");
nsh_output(vtbl, " then\n");
nsh_output(vtbl, " [sequence of <cmd>]\n");
nsh_output(vtbl, " else\n");
nsh_output(vtbl, " [sequence of <cmd>]\n");
nsh_output(vtbl, " fi\n");
#endif
nsh_output(vtbl, "Where <cmd> is one of:\n");
for (ptr = g_cmdmap; ptr->cmd; ptr++)
{
if (ptr->usage)
{
nsh_output(vtbl, " %s %s\n", ptr->cmd, ptr->usage);
}
else
{
nsh_output(vtbl, " %s\n", ptr->cmd);
}
}
return OK;
}
/****************************************************************************
* Name: cmd_unrecognized
****************************************************************************/
static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
nsh_output(vtbl, g_fmtcmdnotfound, argv[0]);
return ERROR;
}
/****************************************************************************
* Name: cmd_exit
****************************************************************************/
static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
nsh_exit(vtbl);
return OK;
}
/****************************************************************************
* Name: nsh_execute
****************************************************************************/
static int nsh_execute(FAR struct nsh_vtbl_s *vtbl, int argc, char *argv[])
{
const struct cmdmap_s *cmdmap;
const char *cmd;
cmd_t handler = cmd_unrecognized;
int ret;
/* The form of argv is:
*
* argv[0]: The command name. This is argv[0] when the arguments
* are, finally, received by the command vtblr
* argv[1]: The beginning of argument (up to NSH_MAX_ARGUMENTS)
* argv[argc]: NULL terminating pointer
*/
cmd = argv[0];
/* See if the command is one that we understand */
for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
{
if (strcmp(cmdmap->cmd, cmd) == 0)
{
/* Check if a valid number of arguments was provided. We
* do this simple, imperfect checking here so that it does
* not have to be performed in each command.
*/
if (argc < cmdmap->minargs)
{
/* Fewer than the minimum number were provided */
nsh_output(vtbl, g_fmtargrequired, cmd);
return ERROR;
}
else if (argc > cmdmap->maxargs)
{
/* More than the maximum number were provided */
nsh_output(vtbl, g_fmttoomanyargs, cmd);
return ERROR;
}
else
{
/* A valid number of arguments were provided (this does
* not mean they are right).
*/
handler = cmdmap->handler;
break;
}
}
}
ret = handler(vtbl, argc, argv);
return ret;
}
/****************************************************************************
* Name: nsh_releaseargs
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
static void nsh_releaseargs(struct cmdarg_s *arg)
{
FAR struct nsh_vtbl_s *vtbl = arg->vtbl;
int i;
/* If the output was redirected, then file descriptor should
* be closed. The created task has its one, independent copy of
* the file descriptor
*/
if (vtbl->np.np_redirect)
{
(void)close(arg->fd);
}
/* Released the cloned vtbl instance */
nsh_release(vtbl);
/* Release the cloned args */
for (i = 0; i < arg->argc; i++)
{
free(arg->argv[i]);
}
free(arg);
}
#endif
/****************************************************************************
* Name: nsh_child
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
static pthread_addr_t nsh_child(pthread_addr_t arg)
{
struct cmdarg_s *carg = (struct cmdarg_s *)arg;
int ret;
dbg("BG %s\n", carg->argv[0]);
/* Execute the specified command on the child thread */
ret = nsh_execute(carg->vtbl, carg->argc, carg->argv);
/* Released the cloned arguments */
dbg("BG %s complete\n", carg->argv[0]);
nsh_releaseargs(carg);
return (void*)ret;
}
#endif
/****************************************************************************
* Name: nsh_cloneargs
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
static inline struct cmdarg_s *nsh_cloneargs(FAR struct nsh_vtbl_s *vtbl,
int fd, int argc, char *argv[])
{
struct cmdarg_s *ret = (struct cmdarg_s *)zalloc(sizeof(struct cmdarg_s));
int i;
if (ret)
{
ret->vtbl = vtbl;
ret->fd = fd;
ret->argc = argc;
for (i = 0; i < argc; i++)
{
ret->argv[i] = strdup(argv[i]);
}
}
return ret;
}
#endif
/****************************************************************************
* Name: nsh_argument
****************************************************************************/
char *nsh_argument(FAR struct nsh_vtbl_s *vtbl, char **saveptr)
{
char *pbegin = *saveptr;
char *pend = NULL;
const char *term;
#ifndef CONFIG_DISABLE_ENVIRON
boolean quoted = FALSE;
#endif
/* Find the beginning of the next token */
for (;
*pbegin && strchr(g_delim, *pbegin) != NULL;
pbegin++);
/* If we are at the end of the string with nothing
* but delimiters found, then return NULL.
*/
if (!*pbegin)
{
return NULL;
}
/* Does the token begin with '>' -- redirection of output? */
if (*pbegin == '>')
{
/* Yes.. does it begin with ">>"? */
if (*(pbegin + 1) == '>')
{
*saveptr = pbegin + 2;
pbegin = (char*)g_redirect2;
}
else
{
*saveptr = pbegin + 1;
pbegin = (char*)g_redirect1;
}
}
/* Does the token begin with '#' -- comment */
else if (*pbegin == '#')
{
/* Return NULL meaning that we are at the end of the line */
*saveptr = pbegin;
pbegin = NULL;
}
else
{
/* Otherwise, we are going to have to parse to find the end of
* the token. Does the token begin with '"'?
*/
if (*pbegin == '"')
{
/* Yes.. then only another '"' can terminate the string */
pbegin++;
term = "\"";
#ifndef CONFIG_DISABLE_ENVIRON
quoted = TRUE;
#endif
}
else
{
/* No, then any of the usual terminators will terminate the argument */
term = g_delim;
}
/* Find the end of the string */
for (pend = pbegin + 1;
*pend && strchr(term, *pend) == NULL;
pend++);
/* pend either points to the end of the string or to
* the first delimiter after the string.
*/
if (*pend)
{
/* Turn the delimiter into a null terminator */
*pend++ = '\0';
}
/* Save the pointer where we left off */
*saveptr = pend;
/* Check for references to environment variables */
if (pbegin[0] == '$' && !quoted)
{
/* Check for built-in variables */
if (strcmp(pbegin, g_exitstatus) == 0)
{
if (vtbl->np.np_fail)
{
return (char*)g_failure;
}
else
{
return (char*)g_success;
}
}
/* Not a built-in? Return the value of the environment variable with this name */
#ifndef CONFIG_DISABLE_ENVIRON
else
{
char *value = getenv(pbegin+1);
if (value)
{
return value;
}
else
{
return (char*)"";
}
}
#endif
}
}
/* Return the beginning of the token. */
return pbegin;
}
/****************************************************************************
* Name: nsh_cmdenabled
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
static inline boolean nsh_cmdenabled(FAR struct nsh_vtbl_s *vtbl)
{
struct nsh_parser_s *np = &vtbl->np;
boolean ret = !np->np_st[np->np_ndx].ns_disabled;
if (ret)
{
switch (np->np_st[np->np_ndx].ns_state)
{
case NSH_PARSER_NORMAL :
case NSH_PARSER_IF:
default:
break;
case NSH_PARSER_THEN:
ret = !np->np_st[np->np_ndx].ns_ifcond;
break;
case NSH_PARSER_ELSE:
ret = np->np_st[np->np_ndx].ns_ifcond;
break;
}
}
return ret;
}
#endif
/****************************************************************************
* Name: nsh_ifthenelse
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
static inline int nsh_ifthenelse(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd, FAR char **saveptr)
{
struct nsh_parser_s *np = &vtbl->np;
FAR char *cmd = *ppcmd;
boolean disabled;
if (cmd)
{
/* Check if the command is preceeded by "if" */
if (strcmp(cmd, "if") == 0)
{
/* Get the cmd following the if */
*ppcmd = nsh_argument(vtbl, saveptr);
if (!*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "if");
goto errout;
}
/* Verify that "if" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_NORMAL &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_ELSE)
{
nsh_output(vtbl, g_fmtcontext, "if");
goto errout;
}
/* Check if we have exceeded the maximum depth of nesting */
if (np->np_ndx >= CONFIG_EXAMPLES_NSH_NESTDEPTH-1)
{
nsh_output(vtbl, g_fmtdeepnesting, "if");
goto errout;
}
/* "Push" the old state and set the new state */
disabled = !nsh_cmdenabled(vtbl);
np->np_ndx++;
np->np_st[np->np_ndx].ns_state = NSH_PARSER_IF;
np->np_st[np->np_ndx].ns_disabled = disabled;
np->np_st[np->np_ndx].ns_ifcond = FALSE;
}
else if (strcmp(cmd, "then") == 0)
{
/* Get the cmd following the then -- there shouldn't be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "then");
goto errout;
}
/* Verify that "then" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_IF)
{
nsh_output(vtbl, g_fmtcontext, "then");
goto errout;
}
np->np_st[np->np_ndx].ns_state = NSH_PARSER_THEN;
}
else if (strcmp(cmd, "else") == 0)
{
/* Get the cmd following the else -- there shouldn't be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "else");
goto errout;
}
/* Verify that "then" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN)
{
nsh_output(vtbl, g_fmtcontext, "else");
goto errout;
}
np->np_st[np->np_ndx].ns_state = NSH_PARSER_ELSE;
}
else if (strcmp(cmd, "fi") == 0)
{
/* Get the cmd following the fi -- there should be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "fi");
goto errout;
}
/* Verify that "fi" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_ELSE)
{
nsh_output(vtbl, g_fmtcontext, "fi");
goto errout;
}
if (np->np_ndx < 1) /* Shouldn't happen */
{
nsh_output(vtbl, g_fmtinternalerror, "if");
goto errout;
}
/* "Pop" the previous state */
np->np_ndx--;
}
else if (np->np_st[np->np_ndx].ns_state == NSH_PARSER_IF)
{
nsh_output(vtbl, g_fmtcontext, cmd);
goto errout;
}
}
return OK;
errout:
np->np_ndx = 0;
np->np_st[0].ns_state = NSH_PARSER_NORMAL;
np->np_st[0].ns_disabled = FALSE;
np->np_st[0].ns_ifcond = FALSE;
return ERROR;
}
#endif
/****************************************************************************
* Name: nsh_saveresult
****************************************************************************/
static inline int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, boolean result)
{
struct nsh_parser_s *np = &vtbl->np;
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
if (np->np_st[np->np_ndx].ns_state == NSH_PARSER_IF)
{
np->np_fail = FALSE;
np->np_st[np->np_ndx].ns_ifcond = result;
return OK;
}
else
#endif
{
np->np_fail = result;
return result ? ERROR : OK;
}
}
/****************************************************************************
* Name: nsh_nice
****************************************************************************/
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
static inline int nsh_nice(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd, FAR char **saveptr)
{
FAR char *cmd = *ppcmd;
vtbl->np.np_nice = 0;
if (cmd)
{
/* Check if the command is preceded by "nice" */
if (strcmp(cmd, "nice") == 0)
{
/* Nicenesses range from -20 (most favorable scheduling) to 19
* (least favorable). Default is 10.
*/
vtbl->np.np_nice = 10;
/* Get the cmd (or -d option of nice command) */
cmd = nsh_argument(vtbl, saveptr);
if (cmd && strcmp(cmd, "-d") == 0)
{
FAR char *val = nsh_argument(vtbl, saveptr);
if (val)
{
char *endptr;
vtbl->np.np_nice = (int)strtol(val, &endptr, 0);
if (vtbl->np.np_nice > 19 || vtbl->np.np_nice < -20 ||
endptr == val || *endptr != '\0')
{
nsh_output(vtbl, g_fmtarginvalid, "nice");
return ERROR;
}
cmd = nsh_argument(vtbl, saveptr);
}
}
/* Return the real command name */
*ppcmd = cmd;
}
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: user_initialize
****************************************************************************/
void user_initialize(void)
{
/* stub */
}
/****************************************************************************
* Name: user_start
****************************************************************************/
int user_start(int argc, char *argv[])
{
int mid_priority;
#if defined(CONFIG_EXAMPLES_NSH_CONSOLE) && defined(CONFIG_EXAMPLES_NSH_TELNET)
int ret;
#endif
/* Set the priority of this task to something in the middle so that 'nice'
* can both raise and lower the priority.
*/
mid_priority = (sched_get_priority_max(SCHED_NSH) + sched_get_priority_min(SCHED_NSH)) >> 1;
{
struct sched_param param;
param.sched_priority = mid_priority;
(void)sched_setscheduler(0, SCHED_NSH, ¶m);
}
/* If both the console and telnet are selected as front-ends, then run
* the telnet front end on another thread.
*/
#if defined(CONFIG_EXAMPLES_NSH_CONSOLE) && defined(CONFIG_EXAMPLES_NSH_TELNET)
# ifndef CONFIG_CUSTOM_STACK
ret = task_create("nsh_telnetmain", mid_priority, CONFIG_EXAMPLES_NSH_STACKSIZE,
nsh_telnetmain, NULL);
# else
ret = task_create("nsh_telnetmain", mid_priority, nsh_telnetmain, NULL);
# endif
if (ret < 0)
{
fprintf(stderr, g_fmtcmdfailed, "user_start", "task_create", NSH_ERRNO);
}
/* If only the telnet front-end is selected, run it on this thread */
#elif defined(CONFIG_EXAMPLES_NSH_TELNET)
return nsh_telnetmain(0, NULL);
#endif
/* If the serial console front end is selected, then run it on this thread */
#ifdef CONFIG_EXAMPLES_NSH_CONSOLE
return nsh_consolemain(0, NULL);
#endif
}
/****************************************************************************
* Name: nsh_parse
****************************************************************************/
int nsh_parse(FAR struct nsh_vtbl_s *vtbl, char *cmdline)
{
FAR char *argv[MAX_ARGV_ENTRIES];
FAR char *saveptr;
FAR char *cmd;
FAR char *redirfile = NULL;
int fd = -1;
int oflags = 0;
int argc;
int ret;
/* Initialize parser state */
memset(argv, 0, MAX_ARGV_ENTRIES*sizeof(FAR char *));
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
vtbl->np.np_bg = FALSE;
#endif
vtbl->np.np_redirect = FALSE;
/* Parse out the command at the beginning of the line */
saveptr = cmdline;
cmd = nsh_argument(vtbl, &saveptr);
/* Handler if-then-else-fi */
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
if (nsh_ifthenelse(vtbl, &cmd, &saveptr) != 0)
{
goto errout;
}
#endif
/* Handle nice */
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
if (nsh_nice(vtbl, &cmd, &saveptr) != 0)
{
goto errout;
}
#endif
/* Check if any command was provided -OR- if command processing is
* currently disabled.
*/
#ifndef CONFIG_EXAMPLES_NSH_DISABLESCRIPT
if (!cmd || !nsh_cmdenabled(vtbl))
#else
if (!cmd)
#endif
{
/* An empty line is not an error and an unprocessed command cannot
* generate an error, but neither should they change the last
* command status.
*/
return OK;
}
/* Parse all of the arguments following the command name. The form
* of argv is:
*
* argv[0]: The command name.
* argv[1]: The beginning of argument (up to NSH_MAX_ARGUMENTS)
* argv[argc-3]: Possibly '>' or '>>'
* argv[argc-2]: Possibly <file>
* argv[argc-1]: Possibly '&'
* argv[argc]: NULL terminating pointer
*
* Maximum size is NSH_MAX_ARGUMENTS+5
*/
argv[0] = cmd;
for (argc = 1; argc < MAX_ARGV_ENTRIES-1; argc++)
{
argv[argc] = nsh_argument(vtbl, &saveptr);
if (!argv[argc])
{
break;
}
}
argv[argc] = NULL;
/* Check if the command should run in background */
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
if (argc > 1 && strcmp(argv[argc-1], "&") == 0)
{
vtbl->np.np_bg = TRUE;
argv[argc-1] = NULL;
argc--;
}
#endif
/* Check if the output was re-directed using > or >> */
if (argc > 2)
{
/* Check for redirection to a new file */
if (strcmp(argv[argc-2], g_redirect1) == 0)
{
vtbl->np.np_redirect = TRUE;
oflags = O_WRONLY|O_CREAT|O_TRUNC;
redirfile = nsh_getfullpath(vtbl, argv[argc-1]);
argc -= 2;
}
/* Check for redirection by appending to an existing file */
else if (strcmp(argv[argc-2], g_redirect2) == 0)
{
vtbl->np.np_redirect = TRUE;
oflags = O_WRONLY|O_CREAT|O_APPEND;
redirfile = nsh_getfullpath(vtbl, argv[argc-1]);
argc -= 2;
}
}
/* Redirected output? */
if (vtbl->np.np_redirect)
{
/* Open the redirection file. This file will eventually
* be closed by a call to either nsh_release (if the command
* is executed in the background) or by nsh_undirect if the
* command is executed in the foreground.
*/
fd = open(redirfile, oflags, 0666);
nsh_freefullpath(redirfile);
redirfile = NULL;
if (fd < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, cmd, "open", NSH_ERRNO);
goto errout;
}
}
/* Check if the maximum number of arguments was exceeded */
if (argc > NSH_MAX_ARGUMENTS)
{
nsh_output(vtbl, g_fmttoomanyargs, cmd);
}
/* Handle the case where the command is executed in background */
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
if (vtbl->np.np_bg)
{
struct sched_param param;
struct nsh_vtbl_s *bkgvtbl;
struct cmdarg_s *args;
pthread_attr_t attr;
pthread_t thread;
/* Get a cloned copy of the vtbl with reference count=1.
* after the command has been processed, the nsh_release() call
* at the end of nsh_child() will destroy the clone.
*/
bkgvtbl = nsh_clone(vtbl);
if (!bkgvtbl)
{
goto errout_with_redirect;
}
/* Create a container for the command arguments */
args = nsh_cloneargs(bkgvtbl, fd, argc, argv);
if (!args)
{
nsh_release(bkgvtbl);
goto errout_with_redirect;
}
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
(void)nsh_redirect(bkgvtbl, fd, NULL);
}
/* Get the execution priority of this task */
ret = sched_getparam(0, ¶m);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, cmd, "sched_getparm", NSH_ERRNO);
nsh_releaseargs(args);
nsh_release(bkgvtbl);
goto errout;
}
/* Determine the priority to execute the command */
if (vtbl->np.np_nice != 0)
{
int priority = param.sched_priority - vtbl->np.np_nice;
if (vtbl->np.np_nice < 0)
{
int max_priority = sched_get_priority_max(SCHED_NSH);
if (priority > max_priority)
{
priority = max_priority;
}
}
else
{
int min_priority = sched_get_priority_min(SCHED_NSH);
if (priority < min_priority)
{
priority = min_priority;
}
}
param.sched_priority = priority;
}
/* Set up the thread attributes */
(void)pthread_attr_init(&attr);
(void)pthread_attr_setschedpolicy(&attr, SCHED_NSH);
(void)pthread_attr_setschedparam(&attr, ¶m);
/* Execute the command as a separate thread at the appropriate priority */
ret = pthread_create(&thread, &attr, nsh_child, (pthread_addr_t)args);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, cmd, "pthread_create", NSH_ERRNO_OF(ret));
nsh_releaseargs(args);
nsh_release(bkgvtbl);
goto errout;
}
nsh_output(vtbl, "%s [%d:%d]\n", cmd, thread, param.sched_priority);
}
else
#endif
{
ubyte save[SAVE_SIZE];
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
nsh_redirect(vtbl, fd, save);
}
/* Then execute the command in "foreground" -- i.e., while the user waits
* for the next prompt.
*/
ret = nsh_execute(vtbl, argc, argv);
/* Restore the original output. Undirect will close the redirection
* file descriptor.
*/
if (vtbl->np.np_redirect)
{
nsh_undirect(vtbl, save);
}
if (ret < 0)
{
goto errout;
}
}
/* Return success if the command succeeded (or at least, starting of the
* command task succeeded).
*/
return nsh_saveresult(vtbl, FALSE);
#ifndef CONFIG_EXAMPLES_NSH_DISABLEBG
errout_with_redirect:
if (vtbl->np.np_redirect)
{
close(fd);
}
#endif
errout:
return nsh_saveresult(vtbl, TRUE);
}
|