-
Notifications
You must be signed in to change notification settings - Fork 1.9k
/
parser.c
2351 lines (2007 loc) · 45.5 KB
/
parser.c
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
/** \file parser.c
The fish parser. Contains functions for parsing code.
*/
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <pwd.h>
#include <dirent.h>
#include <signal.h>
#include "config.h"
#include "util.h"
#include "common.h"
#include "wutil.h"
#include "proc.h"
#include "parser.h"
#include "tokenizer.h"
#include "exec.h"
#include "wildcard.h"
#include "function.h"
#include "builtin.h"
#include "builtin_help.h"
#include "env.h"
#include "expand.h"
#include "reader.h"
#include "sanity.h"
#include "env_universal.h"
#include "event.h"
/** Length of the lineinfo string used for describing the current tokenizer position */
#define LINEINFO_SIZE 128
/**
Maximum number of block levels in code. This is not the same as
maximum recursion depth, this only has to do with how many block
levels are legal in the source code, not at evaluation.
*/
#define BLOCK_MAX_COUNT 64
/**
Maximum number of function calls, i.e. recursion depth.
*/
#define MAX_RECURSION_DEPTH 128
/**
Message about reporting bugs, used on weird internal error to
hopefully get them to report stuff.
*/
#define BUGREPORT_MSG L"If this error can be reproduced, please send a bug report to %s."
/**
Error message for improper use of the exec builtin
*/
#define EXEC_ERR_MSG L"this command can not be used in a pipeline"
/**
Error message for tokenizer error. The tokenizer message is
appended to this message.
*/
#define TOK_ERR_MSG L"Tokenizer error"
/**
Error message for short circut command error.
*/
#define COND_ERR_MSG L"Short circut command requires additional command"
/**
Error message on reaching maximum recusrion depth
*/
#define RECURSION_ERR_MSG L"Maximum recursion depth reached. Accidental infinite loop?"
/**
Error message used when the end of a block can't be located
*/
#define BLOCK_END_ERR_MSG L"Could not locate end of block. The 'end' command is missing, misspelled or a preceding ';' is missing."
/**
Error message on reaching maximum number of block calls
*/
#define BLOCK_ERR_MSG L"Maximum number of nested blocks reached."
/**
Error message on missing 'end'
*/
#define END_ERR_MSG L"Block missing 'end'"
/**
Error message on pipe/bg character without command
*/
#define CMD_ERR_MSG L"Expected command"
/** Last error code */
int error_code;
/** Position of last error */
static int err_pos;
/** Description of last error */
static wchar_t err_str[256];
/** Pointer to the current tokenizer */
static tokenizer *current_tokenizer;
/** String for representing the current line */
static wchar_t lineinfo[LINEINFO_SIZE];
/** This is the position of the beginning of the currently parsed command */
static int current_tokenizer_pos;
/** The current innermost block */
block_t *current_block=0;
/** List of called functions, used to help prevent infinite recursion */
static array_list_t forbidden_function;
/**
String index where the current job started.
*/
static int job_start_pos;
io_data_t *block_io;
/**
List of all profiling data
*/
static array_list_t profile_data;
/**
Keeps track of how many recursive eval calls have been made. Eval
doesn't call itself directly, recursion happens on blocks and on
command substitutions.
*/
static int eval_level=-1;
static int parse_job( process_t *p,
job_t *j,
tokenizer *tok );
/**
Struct used to keep track of profiling data for a command
*/
typedef struct
{
/**
Time spent executing the specified command, including parse time for nested blocks
*/
int exec;
/**
Time spent parsing the specified command, incvluding execution time for command substitutions
*/
int parse;
/**
The block level of the specified command
*/
int level;
/**
If the execution of this command was skipped
*/
int skipped;
/**
The command string
*/
wchar_t *cmd;
} profile_element_t;
int block_count( block_t *b )
{
if( b==0)
return 0;
return( block_count(b->outer)+1);
}
void parser_push_block( int type )
{
block_t *new = malloc( sizeof( block_t ));
// debug( 2, L"Block push %ls %d\n", bl[type], block_count( current_block)+1 );
new->outer = current_block;
new->type = (current_block && current_block->skip)?FAKE:type;
/*
New blocks should be skipped if the outer block is skipped,
except TOP ans SUBST block, which open up new environments
*/
new->skip=current_block?current_block->skip:0;
if( type == TOP || type == SUBST )
new->skip = 0;
new->job = 0;
new->loop_status=LOOP_NORMAL;
current_block = new;
if( (new->type != FUNCTION_DEF) &&
(new->type != FAKE) &&
(new->type != OR) &&
(new->type != AND) &&
(new->type != TOP) )
{
env_push( type == FUNCTION_CALL );
}
}
void parser_pop_block()
{
// debug( 2, L"Block pop %ls %d\n", bl[current_block->type], block_count(current_block)-1 );
if( (current_block->type != FUNCTION_DEF ) &&
(current_block->type != FAKE) &&
(current_block->type != OR) &&
(current_block->type != AND) &&
(current_block->type != TOP) )
{
env_pop();
}
switch( current_block->type)
{
case FOR:
{
free( current_block->param1.for_variable );
al_foreach( ¤t_block->param2.for_vars,
(void (*)(const void *))&free );
al_destroy( ¤t_block->param2.for_vars );
break;
}
case SWITCH:
{
free( current_block->param1.switch_value );
break;
}
case FUNCTION_DEF:
{
free( current_block->param1.function_name );
free( current_block->param2.function_description );
al_foreach( current_block->param4.function_events,
(void (*)(const void *))&event_free );
al_destroy( current_block->param4.function_events );
free( current_block->param4.function_events );
break;
}
}
block_t *old = current_block;
current_block = current_block->outer;
free( old );
}
wchar_t *parser_get_block_desc( int block )
{
switch( block )
{
case WHILE:
return L"while block";
case FOR:
return L"for block";
case IF:
return L"'if' conditional block";
case FUNCTION_DEF:
return L"function definition block";
case FUNCTION_CALL:
return L"fuction invocation block";
case SWITCH:
return L"switch block";
case FAKE:
return L"unexecutable block";
case TOP:
return L"global root block";
case SUBST:
return L"command substitution block";
case BEGIN:
return L"unconditional block";
case AND:
return L"'and' conditional command";
case OR:
return L"'or' conditional command";
default:
return L"unknown/invalid block";
}
}
int parser_skip_arguments( const wchar_t *cmd )
{
return contains_str( cmd,
L"else",
L"begin",
(void *)0 );
}
int parser_is_subcommand( const wchar_t *cmd )
{
return parser_skip_arguments( cmd ) ||
contains_str( cmd,
L"command",
L"builtin",
L"while",
L"exec",
L"if",
L"and",
L"or",
L"not",
(void *)0 );
}
/**
Test if the specified string is command that opens a new block
*/
static int parser_is_block( wchar_t *word)
{
return contains_str( word,
L"for",
L"while",
L"if",
L"function",
L"switch",
L"begin",
(void *)0 );
}
int parser_is_reserved( wchar_t *word)
{
return parser_is_block(word) ||
parser_is_subcommand( word ) ||
contains_str( word,
L"end",
L"case",
L"else",
L"return",
L"continue",
L"break",
(void *)0 );
}
int parser_is_pipe_forbidden( wchar_t *word )
{
return contains_str( word,
L"exec",
L"case",
L"break",
L"return",
L"continue",
(void *)0 );
}
/**
Search the text for the end of the current block
*/
static const wchar_t *parser_find_end( const wchar_t * buff )
{
tokenizer tok;
int had_cmd=0;
int count = 0;
int error=0;
int mark=0;
for( tok_init( &tok, buff, 0 );
tok_has_next( &tok ) && !error;
tok_next( &tok ) )
{
int last_type = tok_last_type( &tok );
switch( last_type )
{
case TOK_STRING:
{
if( !had_cmd )
{
if( wcscmp(tok_last(&tok), L"end")==0)
{
count--;
}
else if( parser_is_block( tok_last(&tok) ) )
{
count++;
}
if( count < 0 )
{
error = 1;
}
had_cmd = 1;
}
break;
}
case TOK_END:
{
had_cmd = 0;
break;
}
case TOK_PIPE:
case TOK_BACKGROUND:
{
if( had_cmd )
{
had_cmd = 0;
}
else
{
error = 1;
}
break;
}
case TOK_ERROR:
error = 1;
break;
default:
break;
}
if(!count)
{
tok_next( &tok );
mark = tok_get_pos( &tok );
break;
}
}
tok_destroy( &tok );
if(!count && !error){
return buff+mark;
}
return 0;
}
wchar_t *parser_cdpath_get( wchar_t *dir )
{
wchar_t *res = 0;
if( !dir )
return 0;
if( dir[0] == L'/' )
{
struct stat buf;
if( wstat( dir, &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
res = wcsdup( dir );
}
}
}
else
{
wchar_t *path = env_get(L"CDPATH");
if( path == 0 )
{
path = L".";
}
wchar_t *path_cpy = wcsdup( path );
wchar_t *nxt_path = path;
wchar_t *state;
wchar_t *whole_path;
if( (path_cpy==0) )
{
die_mem();
}
for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
nxt_path != 0;
nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
{
wchar_t *expanded_path = expand_tilde( wcsdup(nxt_path) );
// debug( 2, L"woot %ls\n", expanded_path );
int path_len = wcslen( expanded_path );
if( path_len == 0 )
{
free(expanded_path );
continue;
}
whole_path =
wcsdupcat2( expanded_path,
( expanded_path[path_len-1] != L'/' )?L"/":L"",
dir, 0 );
free(expanded_path );
struct stat buf;
if( wstat( whole_path, &buf ) == 0 )
{
if( S_ISDIR(buf.st_mode) )
{
res = whole_path;
break;
}
}
free( whole_path );
}
free( path_cpy );
}
return res;
}
void parser_forbid_function( wchar_t *function )
{
/*
if( function )
debug( 2, L"Forbid %ls\n", function );
*/
al_push( &forbidden_function, function?wcsdup(function):0 );
}
void parser_allow_function()
{
/*
if( al_peek( &forbidden_function) )
debug( 2, L"Allow %ls\n", al_peek( &forbidden_function) );
*/
free( (void *) al_pop( &forbidden_function ) );
}
void error( int ec, const wchar_t *str, int p )
{
error_code = ec;
wcsncpy( err_str, str, 256 );
err_pos = p;
}
/**
Wrapper for the error function, which sets the error string to "ec 'ea'".
*/
static void error_arg( int ec, const wchar_t *es, const wchar_t *ea, int p )
{
wchar_t *msg = wcsdupcat2( es, L" \'", ea, L"\'", 0 );
error( ec, msg, p );
free(msg);
}
wchar_t *get_filename( const wchar_t *cmd )
{
wchar_t *path;
if(wcschr( cmd, '/' ) != 0 )
{
if( waccess( cmd, X_OK )==0 )
{
struct stat buff;
wstat( cmd, &buff );
if( S_ISREG(buff.st_mode) )
return wcsdup( cmd );
else
return 0;
}
}
else
{
path = env_get(L"PATH");
if( path != 0 )
{
/*
Allocate string long enough to hold the whole command
*/
wchar_t *new_cmd = malloc( sizeof(wchar_t)*(wcslen(cmd)+wcslen(path)+2) );
/*
We tokenize a copy of the path, since strtok modifies
its arguments
*/
wchar_t *path_cpy = wcsdup( path );
wchar_t *nxt_path = path;
wchar_t *state;
if( (new_cmd==0) || (path_cpy==0) )
{
die_mem();
}
for( nxt_path = wcstok( path_cpy, ARRAY_SEP_STR, &state );
nxt_path != 0;
nxt_path = wcstok( 0, ARRAY_SEP_STR, &state) )
{
int path_len = wcslen( nxt_path );
wcscpy( new_cmd, nxt_path );
if( new_cmd[path_len-1] != '/' )
{
new_cmd[path_len++]='/';
}
wcscpy( &new_cmd[path_len], cmd );
if( waccess( new_cmd, X_OK )==0 )
{
struct stat buff;
if( wstat( new_cmd, &buff )==-1 )
{
if( errno != EACCES )
wperror( L"stat" );
continue;
}
if( S_ISREG(buff.st_mode) )
{
free( path_cpy );
return new_cmd;
}
}
else
{
switch( errno )
{
case ENOENT:
case ENAMETOOLONG:
case EACCES:
case ENOTDIR:
break;
default:
debug( 1,
L"Error while searching for command %d",
new_cmd );
wperror( L"access" );
}
}
}
free( path_cpy );
free( new_cmd );
}
}
return 0;
}
void parser_init()
{
if( profile )
{
al_init( &profile_data);
}
al_init( &forbidden_function );
}
void print_profile( array_list_t *p,
int pos,
FILE *out )
{
profile_element_t *me, *prev;
int i;
int my_time;
if( pos >= al_get_count( p ) )
return;
me= (profile_element_t *)al_get( p, pos );
if( !me->skipped )
{
my_time=me->parse+me->exec;
for( i=pos+1; i<al_get_count(p); i++ )
{
prev = (profile_element_t *)al_get( p, i );
if( prev->skipped )
continue;
if( prev->level <= me->level )
break;
if( prev->level > me->level+1 )
continue;
my_time -= prev->parse;
my_time -= prev->exec;
}
if( me->cmd )
{
fwprintf( out, L"%d\t%d\t", my_time, me->parse+me->exec );
for( i=0; i<me->level; i++ )
{
fwprintf( out, L"-" );
}
fwprintf( out, L"> %ls\n", me->cmd );
}
}
print_profile( p, pos+1, out );
free( me->cmd );
free( me );
}
void parser_destroy()
{
if( profile )
{
/*
Save profiling information
*/
FILE *f = fopen( profile, "w" );
if( !f )
{
debug( 1,
L"Could not write profiling information to file '%s'",
profile );
}
else
{
fwprintf( f,
L"Time\tSum\tCommand\n",
al_get_count( &profile_data ) );
print_profile( &profile_data, 0, f );
fclose( f );
}
al_destroy( &profile_data );
}
al_destroy( &forbidden_function );
}
/**
Print error message if an error has occured while parsing
*/
static void print_errors()
{
if( error_code )
{
int tmp;
debug( 0, L"%ls", err_str );
tmp = current_tokenizer_pos;
current_tokenizer_pos = err_pos;
fwprintf( stderr, L"%ls", parser_current_line() );
current_tokenizer_pos=tmp;
}
}
int eval_args( const wchar_t *line, array_list_t *args )
{
tokenizer tok;
/*
eval_args may be called while evaulating another command, so we
save the previous tokenizer and restore it on exit
*/
tokenizer *previous_tokenizer=current_tokenizer;
int previous_pos=current_tokenizer_pos;
int do_loop=1;
tok_init( &tok, line, 0 );
current_tokenizer=&tok;
error_code=0;
for(;do_loop && tok_has_next( &tok) ; tok_next( &tok ) )
{
current_tokenizer_pos = tok_get_pos( &tok );
switch(tok_last_type( &tok ) )
{
case TOK_STRING:
if( !expand_string( wcsdup(tok_last( &tok )), args, 0 ) )
{
err_pos=tok_get_pos( &tok );
do_loop=0;
}
break;
case TOK_END:
break;
case TOK_ERROR:
{
error_arg( SYNTAX_ERROR,
TOK_ERR_MSG,
tok_last(&tok),
tok_get_pos( &tok ) );
do_loop=0;
break;
}
default:
error_arg( SYNTAX_ERROR,
L"Unexpected token of type",
tok_get_desc( tok_last_type(&tok)),
tok_get_pos( &tok ) );
do_loop=0;
break;
}
}
print_errors();
tok_destroy( &tok );
current_tokenizer=previous_tokenizer;
current_tokenizer_pos = previous_pos;
return 1;
}
wchar_t *parser_current_line()
{
int lineno=1;
wchar_t *file = reader_current_filename();
wchar_t *whole_str = tok_string( current_tokenizer );
wchar_t *line = whole_str;
wchar_t *line_end;
int i;
int offset;
int current_line_pos=current_tokenizer_pos;
if( !line )
return L"";
lineinfo[0]=0;
/*
Calculate line number, line offset, etc.
*/
for( i=0; i<current_tokenizer_pos; i++ )
{
if( whole_str[i] == L'\n' )
{
lineno++;
current_line_pos = current_tokenizer_pos-i-1;
line = &whole_str[i+1];
}
}
/*
Copy current line from whole string
*/
line_end = wcschr( line, L'\n' );
if( !line_end )
line_end = line+wcslen(line);
line = wcsndup( line, line_end-line );
// debug( 2, L"Current pos %d, line pos %d, file_length %d\n", current_tokenizer_pos, current_line_pos, wcslen(whole_str));
if( !is_interactive )
{
swprintf( lineinfo,
LINEINFO_SIZE,
L"%ls (line %d): %n",
file,
lineno,
&offset );
}
else
{
offset=0;
}
/* Skip printing if we are in interactive mode and the error was on the first character of the line */
if( offset+current_line_pos )
swprintf( lineinfo+offset,
LINEINFO_SIZE-offset,
L"%ls\n%*c^\n",
line,
offset+current_line_pos,
L' ' );
free( line );
return lineinfo;
}
int parser_get_pos()
{
return tok_get_pos( current_tokenizer );
}
int parser_get_job_pos()
{
return job_start_pos;
}
void parser_set_pos( int p)
{
tok_set_pos( current_tokenizer, p );
}
const wchar_t *parser_get_buffer()
{
return tok_string( current_tokenizer );
}
int parser_is_help( wchar_t *s, int min_match )
{
int len = wcslen(s);
return ( wcscmp( L"-h", s ) == 0 ) ||
( len >= 3 && (wcsncmp( L"--help", s, len ) == 0) );
}
/**
Parse options for the specified job
\param p the process to parse options for
\param j the job to which the process belongs to
\param tok the tokenizer to read options from
\param args the argument list to insert options into
*/
static void parse_job_main_loop( process_t *p,
job_t *j,
tokenizer *tok,
array_list_t *args )
{
int is_finished=0;
int proc_is_count=0;
/*
Test if this is the 'count' command. We need to special case
count, since it should display a help message on 'count .h',
but not on 'set foo -h; count $foo'.
*/
if( p->actual_cmd )
{
wchar_t *woot = wcsrchr( p->actual_cmd, L'/' );
if( !woot )
woot = p->actual_cmd;
else
woot++;
proc_is_count = wcscmp( woot, L"count" )==0;
}
while( 1 )
{
/* debug( 2, L"Read token %ls\n", wcsdup(tok_last( tok )) ); */
switch( tok_last_type( tok ) )
{
case TOK_PIPE:
if( (p->type == INTERNAL_EXEC) )
{
error( SYNTAX_ERROR,
EXEC_ERR_MSG,
tok_get_pos( tok ) );
return;
}
p->pipe_fd = wcstol( tok_last( tok ), 0, 10 );
p->argv = list_to_char_arr( args );
p->next = calloc( 1, sizeof( process_t ) );
if( p->next == 0 )
{
die_mem();
}
tok_next( tok );
if( !parse_job( p->next, j, tok ))
{
/*
Don't do anything on failiure. parse_job will notice the error flag beeing set
*/
}
is_finished = 1;
break;
case TOK_BACKGROUND:
j->fg = 0;