-
Notifications
You must be signed in to change notification settings - Fork 175
/
general.c
1451 lines (1216 loc) · 34.1 KB
/
general.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
/* general.c -- Stuff that is used by all files. */
/* Copyright (C) 1987-2021 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "bashtypes.h"
#if defined (HAVE_SYS_PARAM_H)
# include <sys/param.h>
#endif
#include "posixstat.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include "filecntl.h"
#include "bashansi.h"
#include <stdio.h>
#include "chartypes.h"
#include <errno.h>
#include "bashintl.h"
#include "shell.h"
#include "parser.h"
#include "flags.h"
#include "findcmd.h"
#include "test.h"
#include "trap.h"
#include "pathexp.h"
#include "builtins/common.h"
#if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR)
# include <mbstr.h> /* mbschr */
#endif
#include <tilde/tilde.h>
#if !defined (errno)
extern int errno;
#endif /* !errno */
#ifdef __CYGWIN__
# include <sys/cygwin.h>
#endif
static char *bash_special_tilde_expansions PARAMS((char *));
static int unquoted_tilde_word PARAMS((const char *));
static void initialize_group_array PARAMS((void));
/* A standard error message to use when getcwd() returns NULL. */
const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories");
/* Do whatever is necessary to initialize `Posix mode'. This currently
modifies the following variables which are controlled via shopt:
interactive_comments
source_uses_path
expand_aliases
inherit_errexit
print_shift_error
posixglob
and the following variables which cannot be user-modified:
source_searches_cwd
If we add to the first list, we need to change the table and functions
below */
static struct {
int *posix_mode_var;
} posix_vars[] =
{
&interactive_comments,
&source_uses_path,
&expaliases_flag,
&inherit_errexit,
&print_shift_error,
0
};
static char *saved_posix_vars = 0;
void
posix_initialize (on)
int on;
{
/* Things that should be turned on when posix mode is enabled. */
if (on != 0)
{
interactive_comments = source_uses_path = 1;
expand_aliases = expaliases_flag = 1;
inherit_errexit = 1;
source_searches_cwd = 0;
print_shift_error = 1;
}
/* Things that should be turned on when posix mode is disabled. */
else if (saved_posix_vars) /* on == 0, restore saved settings */
{
set_posix_options (saved_posix_vars);
expand_aliases = expaliases_flag;
free (saved_posix_vars);
saved_posix_vars = 0;
}
else /* on == 0, restore a default set of settings */
{
source_searches_cwd = 1;
expand_aliases = expaliases_flag = interactive_shell; /* XXX */
print_shift_error = 0;
}
}
int
num_posix_options ()
{
return ((sizeof (posix_vars) / sizeof (posix_vars[0])) - 1);
}
char *
get_posix_options (bitmap)
char *bitmap;
{
register int i;
if (bitmap == 0)
bitmap = (char *)xmalloc (num_posix_options ()); /* no trailing NULL */
for (i = 0; posix_vars[i].posix_mode_var; i++)
bitmap[i] = *(posix_vars[i].posix_mode_var);
return bitmap;
}
#undef save_posix_options
void
save_posix_options ()
{
saved_posix_vars = get_posix_options (saved_posix_vars);
}
void
set_posix_options (bitmap)
const char *bitmap;
{
register int i;
for (i = 0; posix_vars[i].posix_mode_var; i++)
*(posix_vars[i].posix_mode_var) = bitmap[i];
}
/* **************************************************************** */
/* */
/* Functions to convert to and from and display non-standard types */
/* */
/* **************************************************************** */
#if defined (RLIMTYPE)
RLIMTYPE
string_to_rlimtype (s)
char *s;
{
RLIMTYPE ret;
int neg;
ret = 0;
neg = 0;
while (s && *s && whitespace (*s))
s++;
if (s && (*s == '-' || *s == '+'))
{
neg = *s == '-';
s++;
}
for ( ; s && *s && DIGIT (*s); s++)
ret = (ret * 10) + TODIGIT (*s);
return (neg ? -ret : ret);
}
void
print_rlimtype (n, addnl)
RLIMTYPE n;
int addnl;
{
char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p;
p = s + sizeof(s);
*--p = '\0';
if (n < 0)
{
do
*--p = '0' - n % 10;
while ((n /= 10) != 0);
*--p = '-';
}
else
{
do
*--p = '0' + n % 10;
while ((n /= 10) != 0);
}
printf ("%s%s", p, addnl ? "\n" : "");
}
#endif /* RLIMTYPE */
/* **************************************************************** */
/* */
/* Input Validation Functions */
/* */
/* **************************************************************** */
/* Return non-zero if all of the characters in STRING are digits. */
int
all_digits (string)
const char *string;
{
register const char *s;
for (s = string; *s; s++)
if (DIGIT (*s) == 0)
return (0);
return (1);
}
/* Return non-zero if the characters pointed to by STRING constitute a
valid number. Stuff the converted number into RESULT if RESULT is
not null. */
int
legal_number (string, result)
const char *string;
intmax_t *result;
{
intmax_t value;
char *ep;
if (result)
*result = 0;
if (string == 0)
return 0;
errno = 0;
value = strtoimax (string, &ep, 10);
if (errno || ep == string)
return 0; /* errno is set on overflow or underflow */
/* Skip any trailing whitespace, since strtoimax does not. */
while (whitespace (*ep))
ep++;
/* If *string is not '\0' but *ep is '\0' on return, the entire string
is valid. */
if (*string && *ep == '\0')
{
if (result)
*result = value;
/* The SunOS4 implementation of strtol() will happily ignore
overflow conditions, so this cannot do overflow correctly
on those systems. */
return 1;
}
return (0);
}
/* Return 1 if this token is a legal shell `identifier'; that is, it consists
solely of letters, digits, and underscores, and does not begin with a
digit. */
int
legal_identifier (name)
const char *name;
{
register const char *s;
unsigned char c;
if (!name || !(c = *name) || (legal_variable_starter (c) == 0))
return (0);
for (s = name + 1; (c = *s) != 0; s++)
{
if (legal_variable_char (c) == 0)
return (0);
}
return (1);
}
/* Return 1 if NAME is a valid value that can be assigned to a nameref
variable. FLAGS can be 2, in which case the name is going to be used
to create a variable. Other values are currently unused, but could
be used to allow values to be stored and indirectly referenced, but
not used in assignments. */
int
valid_nameref_value (name, flags)
const char *name;
int flags;
{
if (name == 0 || *name == 0)
return 0;
/* valid identifier */
#if defined (ARRAY_VARS)
if (legal_identifier (name) || (flags != 2 && valid_array_reference (name, 0)))
#else
if (legal_identifier (name))
#endif
return 1;
return 0;
}
int
check_selfref (name, value, flags)
const char *name;
char *value;
int flags;
{
char *t;
if (STREQ (name, value))
return 1;
#if defined (ARRAY_VARS)
if (valid_array_reference (value, 0))
{
t = array_variable_name (value, 0, (char **)NULL, (int *)NULL);
if (t && STREQ (name, t))
{
free (t);
return 1;
}
free (t);
}
#endif
return 0; /* not a self reference */
}
/* Make sure that WORD is a valid shell identifier, i.e.
does not contain a dollar sign, nor is quoted in any way.
If CHECK_WORD is non-zero,
the word is checked to ensure that it consists of only letters,
digits, and underscores, and does not consist of all digits. */
int
check_identifier (word, check_word)
WORD_DESC *word;
int check_word;
{
if (word->flags & (W_HASDOLLAR|W_QUOTED)) /* XXX - HASDOLLAR? */
{
internal_error (_("`%s': not a valid identifier"), word->word);
return (0);
}
else if (check_word && (all_digits (word->word) || legal_identifier (word->word) == 0))
{
internal_error (_("`%s': not a valid identifier"), word->word);
return (0);
}
else
return (1);
}
/* Return 1 if STRING is a function name that the shell will import from
the environment. Currently we reject attempts to import shell functions
containing slashes, beginning with newlines or containing blanks. In
Posix mode, we require that STRING be a valid shell identifier. Not
used yet. */
int
importable_function_name (string, len)
const char *string;
size_t len;
{
if (absolute_program (string)) /* don't allow slash */
return 0;
if (*string == '\n') /* can't start with a newline */
return 0;
if (shellblank (*string) || shellblank(string[len-1]))
return 0;
return (posixly_correct ? legal_identifier (string) : 1);
}
int
exportable_function_name (string)
const char *string;
{
if (absolute_program (string))
return 0;
if (mbschr (string, '=') != 0)
return 0;
return 1;
}
/* Return 1 if STRING comprises a valid alias name. The shell accepts
essentially all characters except those which must be quoted to the
parser (which disqualifies them from alias expansion anyway) and `/'. */
int
legal_alias_name (string, flags)
const char *string;
int flags;
{
register const char *s;
for (s = string; *s; s++)
if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/'))
return 0;
return 1;
}
/* Returns non-zero if STRING is an assignment statement. The returned value
is the index of the `=' sign. If FLAGS&1 we are expecting a compound assignment
and require an array subscript before the `=' to denote an assignment
statement. */
int
assignment (string, flags)
const char *string;
int flags;
{
register unsigned char c;
register int newi, indx;
c = string[indx = 0];
#if defined (ARRAY_VARS)
/* If parser_state includes PST_COMPASSIGN, FLAGS will include 1, so we are
parsing the contents of a compound assignment. If parser_state includes
PST_REPARSE, we are in the middle of an assignment statement and breaking
the words between the parens into words and assignment statements, but
we don't need to check for that right now. Within a compound assignment,
the subscript is required to make the word an assignment statement. If
we don't have a subscript, even if the word is a valid assignment
statement otherwise, we don't want to treat it as one. */
if ((flags & 1) && c != '[') /* ] */
return (0);
else if ((flags & 1) == 0 && legal_variable_starter (c) == 0)
#else
if (legal_variable_starter (c) == 0)
#endif
return (0);
while (c = string[indx])
{
/* The following is safe. Note that '=' at the start of a word
is not an assignment statement. */
if (c == '=')
return (indx);
#if defined (ARRAY_VARS)
if (c == '[')
{
newi = skipsubscript (string, indx, (flags & 2) ? 1 : 0);
/* XXX - why not check for blank subscripts here, if we do in
valid_array_reference? */
if (string[newi++] != ']')
return (0);
if (string[newi] == '+' && string[newi+1] == '=')
return (newi + 1);
return ((string[newi] == '=') ? newi : 0);
}
#endif /* ARRAY_VARS */
/* Check for `+=' */
if (c == '+' && string[indx+1] == '=')
return (indx + 1);
/* Variable names in assignment statements may contain only letters,
digits, and `_'. */
if (legal_variable_char (c) == 0)
return (0);
indx++;
}
return (0);
}
int
line_isblank (line)
const char *line;
{
register int i;
if (line == 0)
return 0; /* XXX */
for (i = 0; line[i]; i++)
if (isblank ((unsigned char)line[i]) == 0)
break;
return (line[i] == '\0');
}
/* **************************************************************** */
/* */
/* Functions to manage files and file descriptors */
/* */
/* **************************************************************** */
/* A function to unset no-delay mode on a file descriptor. Used in shell.c
to unset it on the fd passed as stdin. Should be called on stdin if
readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */
#if !defined (O_NDELAY)
# if defined (FNDELAY)
# define O_NDELAY FNDELAY
# endif
#endif /* O_NDELAY */
/* Make sure no-delay mode is not set on file descriptor FD. */
int
sh_unset_nodelay_mode (fd)
int fd;
{
int flags, bflags;
if ((flags = fcntl (fd, F_GETFL, 0)) < 0)
return -1;
bflags = 0;
/* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present
and O_NDELAY is defined. */
#ifdef O_NONBLOCK
bflags |= O_NONBLOCK;
#endif
#ifdef O_NDELAY
bflags |= O_NDELAY;
#endif
if (flags & bflags)
{
flags &= ~bflags;
return (fcntl (fd, F_SETFL, flags));
}
return 0;
}
/* Just a wrapper for the define in include/filecntl.h */
int
sh_setclexec (fd)
int fd;
{
return (SET_CLOSE_ON_EXEC (fd));
}
/* Return 1 if file descriptor FD is valid; 0 otherwise. */
int
sh_validfd (fd)
int fd;
{
return (fcntl (fd, F_GETFD, 0) >= 0);
}
int
fd_ispipe (fd)
int fd;
{
errno = 0;
return ((lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE));
}
/* There is a bug in the NeXT 2.1 rlogind that causes opens
of /dev/tty to fail. */
#if defined (__BEOS__)
/* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it
into a no-op. This should probably go away in the future. */
# undef O_NONBLOCK
# define O_NONBLOCK 0
#endif /* __BEOS__ */
void
check_dev_tty ()
{
int tty_fd;
char *tty;
tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK);
if (tty_fd < 0)
{
tty = (char *)ttyname (fileno (stdin));
if (tty == 0)
return;
tty_fd = open (tty, O_RDWR|O_NONBLOCK);
}
if (tty_fd >= 0)
close (tty_fd);
}
/* Return 1 if PATH1 and PATH2 are the same file. This is kind of
expensive. If non-NULL STP1 and STP2 point to stat structures
corresponding to PATH1 and PATH2, respectively. */
int
same_file (path1, path2, stp1, stp2)
const char *path1, *path2;
struct stat *stp1, *stp2;
{
struct stat st1, st2;
if (stp1 == NULL)
{
if (stat (path1, &st1) != 0)
return (0);
stp1 = &st1;
}
if (stp2 == NULL)
{
if (stat (path2, &st2) != 0)
return (0);
stp2 = &st2;
}
return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino));
}
/* Move FD to a number close to the maximum number of file descriptors
allowed in the shell process, to avoid the user stepping on it with
redirection and causing us extra work. If CHECK_NEW is non-zero,
we check whether or not the file descriptors are in use before
duplicating FD onto them. MAXFD says where to start checking the
file descriptors. If it's less than 20, we get the maximum value
available from getdtablesize(2). */
int
move_to_high_fd (fd, check_new, maxfd)
int fd, check_new, maxfd;
{
int script_fd, nfds, ignore;
if (maxfd < 20)
{
nfds = getdtablesize ();
if (nfds <= 0)
nfds = 20;
if (nfds > HIGH_FD_MAX)
nfds = HIGH_FD_MAX; /* reasonable maximum */
}
else
nfds = maxfd;
for (nfds--; check_new && nfds > 3; nfds--)
if (fcntl (nfds, F_GETFD, &ignore) == -1)
break;
if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1)
{
if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */
close (fd);
return (script_fd);
}
/* OK, we didn't find one less than our artificial maximum; return the
original file descriptor. */
return (fd);
}
/* Return non-zero if the characters from SAMPLE are not all valid
characters to be found in the first line of a shell script. We
check up to the first newline, or SAMPLE_LEN, whichever comes first.
All of the characters must be printable or whitespace. */
int
check_binary_file (sample, sample_len)
const char *sample;
int sample_len;
{
register int i;
int nline;
unsigned char c;
if (sample_len >= 4 && sample[0] == 0x7f && sample[1] == 'E' && sample[2] == 'L' && sample[3] == 'F')
return 1;
/* Generally we check the first line for NULs. If the first line looks like
a `#!' interpreter specifier, we look for NULs in the first two lines. */
nline = (sample[0] == '#' && sample[1] == '!') ? 2 : 1;
for (i = 0; i < sample_len; i++)
{
c = sample[i];
if (c == '\n' && --nline == 0)
return (0);
if (c == '\0')
return (1);
}
return (0);
}
/* **************************************************************** */
/* */
/* Functions to manipulate pipes */
/* */
/* **************************************************************** */
int
sh_openpipe (pv)
int *pv;
{
int r;
if ((r = pipe (pv)) < 0)
return r;
pv[0] = move_to_high_fd (pv[0], 1, 64);
pv[1] = move_to_high_fd (pv[1], 1, 64);
return 0;
}
int
sh_closepipe (pv)
int *pv;
{
if (pv[0] >= 0)
close (pv[0]);
if (pv[1] >= 0)
close (pv[1]);
pv[0] = pv[1] = -1;
return 0;
}
/* **************************************************************** */
/* */
/* Functions to inspect pathnames */
/* */
/* **************************************************************** */
int
file_exists (fn)
const char *fn;
{
struct stat sb;
return (stat (fn, &sb) == 0);
}
int
file_isdir (fn)
const char *fn;
{
struct stat sb;
return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode));
}
int
file_iswdir (fn)
const char *fn;
{
return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0);
}
/* Return 1 if STRING is "." or "..", optionally followed by a directory
separator */
int
path_dot_or_dotdot (string)
const char *string;
{
if (string == 0 || *string == '\0' || *string != '.')
return (0);
/* string[0] == '.' */
if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2])))
return (1);
return (0);
}
/* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd'
to decide whether or not to look up a directory name in $CDPATH. */
int
absolute_pathname (string)
const char *string;
{
if (string == 0 || *string == '\0')
return (0);
if (ABSPATH(string))
return (1);
if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */
return (1);
if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */
return (1);
return (0);
}
/* Return 1 if STRING is an absolute program name; it is absolute if it
contains any slashes. This is used to decide whether or not to look
up through $PATH. */
int
absolute_program (string)
const char *string;
{
return ((char *)mbschr (string, '/') != (char *)NULL);
}
/* **************************************************************** */
/* */
/* Functions to manipulate pathnames */
/* */
/* **************************************************************** */
/* Turn STRING (a pathname) into an absolute pathname, assuming that
DOT_PATH contains the symbolic location of `.'. This always
returns a new string, even if STRING was an absolute pathname to
begin with. */
char *
make_absolute (string, dot_path)
const char *string, *dot_path;
{
char *result;
if (dot_path == 0 || ABSPATH(string))
#ifdef __CYGWIN__
{
char pathbuf[PATH_MAX + 1];
/* WAS cygwin_conv_to_full_posix_path (string, pathbuf); */
cygwin_conv_path (CCP_WIN_A_TO_POSIX, string, pathbuf, PATH_MAX);
result = savestring (pathbuf);
}
#else
result = savestring (string);
#endif
else
result = sh_makepath (dot_path, string, 0);
return (result);
}
/* Return the `basename' of the pathname in STRING (the stuff after the
last '/'). If STRING is `/', just return it. */
char *
base_pathname (string)
char *string;
{
char *p;
#if 0
if (absolute_pathname (string) == 0)
return (string);
#endif
if (string[0] == '/' && string[1] == 0)
return (string);
p = (char *)strrchr (string, '/');
return (p ? ++p : string);
}
/* Return the full pathname of FILE. Easy. Filenames that begin
with a '/' are returned as themselves. Other filenames have
the current working directory prepended. A new string is
returned in either case. */
char *
full_pathname (file)
char *file;
{
char *ret;
file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file);
if (ABSPATH(file))
return (file);
ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT));
free (file);
return (ret);
}
/* A slightly related function. Get the prettiest name of this
directory possible. */
static char tdir[PATH_MAX];
/* Return a pretty pathname. If the first part of the pathname is
the same as $HOME, then replace that with `~'. */
char *
polite_directory_format (name)
char *name;
{
char *home;
int l;
home = get_string_value ("HOME");
l = home ? strlen (home) : 0;
if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/'))
{
strncpy (tdir + 1, name + l, sizeof(tdir) - 2);
tdir[0] = '~';
tdir[sizeof(tdir) - 1] = '\0';
return (tdir);
}
else
return (name);
}
/* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to
keep any tilde prefix and PROMPT_DIRTRIM trailing directory components
and replace the intervening characters with `...' */
char *
trim_pathname (name, maxlen)
char *name;
int maxlen;
{
int nlen, ndirs;
intmax_t nskip;
char *nbeg, *nend, *ntail, *v;
if (name == 0 || (nlen = strlen (name)) == 0)
return name;
nend = name + nlen;
v = get_string_value ("PROMPT_DIRTRIM");
if (v == 0 || *v == 0)
return name;
if (legal_number (v, &nskip) == 0 || nskip <= 0)
return name;
/* Skip over tilde prefix */
nbeg = name;
if (name[0] == '~')
for (nbeg = name; *nbeg; nbeg++)
if (*nbeg == '/')
{
nbeg++;
break;
}
if (*nbeg == 0)
return name;
for (ndirs = 0, ntail = nbeg; *ntail; ntail++)
if (*ntail == '/')
ndirs++;
if (ndirs < nskip)
return name;
for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--)
{
if (*ntail == '/')
nskip--;
if (nskip == 0)
break;
}
if (ntail == nbeg)
return name;
/* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */
nlen = ntail - nbeg;
if (nlen <= 3)
return name;
*nbeg++ = '.';
*nbeg++ = '.';
*nbeg++ = '.';
nlen = nend - ntail;
memmove (nbeg, ntail, nlen);
nbeg[nlen] = '\0';
return name;
}
/* Return a printable representation of FN without special characters. The
caller is responsible for freeing memory if this returns something other
than its argument. If FLAGS is non-zero, we are printing for portable
re-input and should single-quote filenames appropriately. */
char *
printable_filename (fn, flags)
char *fn;
int flags;
{
char *newf;
if (ansic_shouldquote (fn))
newf = ansic_quote (fn, 0, NULL);