-
Notifications
You must be signed in to change notification settings - Fork 89
/
edit.c
1013 lines (942 loc) · 20.5 KB
/
edit.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
/*
* Copyright (C) 1984-2024 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information, see the README file.
*/
#include "less.h"
#include "position.h"
#if HAVE_STAT
#include <sys/stat.h>
#endif
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#if OS2 || __MVS__ || (defined WIFSIGNALED && defined WTERMSIG)
#include <signal.h>
#endif
public int fd0 = 0;
extern lbool new_file;
extern char *every_first_cmd;
extern int force_open;
extern int is_tty;
extern int sigs;
extern int hshift;
extern int want_filesize;
extern int consecutive_nulls;
extern int modelines;
extern int show_preproc_error;
extern IFILE curr_ifile;
extern IFILE old_ifile;
extern struct scrpos initial_scrpos;
extern void *ml_examine;
#if SPACES_IN_FILENAMES
extern char openquote;
extern char closequote;
#endif
#if LOGFILE
extern int logfile;
extern int force_logfile;
extern char *namelogfile;
#endif
#if HAVE_STAT_INO
public dev_t curr_dev;
public ino_t curr_ino;
#endif
/*
* Textlist functions deal with a list of words separated by spaces.
* init_textlist sets up a textlist structure.
* forw_textlist uses that structure to iterate thru the list of
* words, returning each one as a standard null-terminated string.
* back_textlist does the same, but runs thru the list backwards.
*/
public void init_textlist(struct textlist *tlist, mutable char *str)
{
char *s;
#if SPACES_IN_FILENAMES
lbool meta_quoted = FALSE;
lbool delim_quoted = FALSE;
constant char *esc = get_meta_escape();
size_t esclen = strlen(esc);
#endif
tlist->string = skipsp(str);
tlist->endstring = tlist->string + strlen(tlist->string);
for (s = str; s < tlist->endstring; s++)
{
#if SPACES_IN_FILENAMES
if (meta_quoted)
{
meta_quoted = 0;
} else if (esclen > 0 && s + esclen < tlist->endstring &&
strncmp(s, esc, esclen) == 0)
{
meta_quoted = 1;
s += esclen - 1;
} else if (delim_quoted)
{
if (*s == closequote)
delim_quoted = 0;
} else /* (!delim_quoted) */
{
if (*s == openquote)
delim_quoted = 1;
else if (*s == ' ')
*s = '\0';
}
#else
if (*s == ' ')
*s = '\0';
#endif
}
}
public constant char * forw_textlist(struct textlist *tlist, constant char *prev)
{
constant char *s;
/*
* prev == NULL means return the first word in the list.
* Otherwise, return the word after "prev".
*/
if (prev == NULL)
s = tlist->string;
else
s = prev + strlen(prev);
if (s >= tlist->endstring)
return (NULL);
while (*s == '\0')
s++;
if (s >= tlist->endstring)
return (NULL);
return (s);
}
public constant char * back_textlist(struct textlist *tlist, constant char *prev)
{
constant char *s;
/*
* prev == NULL means return the last word in the list.
* Otherwise, return the word before "prev".
*/
if (prev == NULL)
s = tlist->endstring;
else if (prev <= tlist->string)
return (NULL);
else
s = prev - 1;
while (*s == '\0')
s--;
if (s <= tlist->string)
return (NULL);
while (s[-1] != '\0' && s > tlist->string)
s--;
return (s);
}
/*
* Parse a single option setting in a modeline.
*/
static void modeline_option(constant char *str, size_t opt_len)
{
struct mloption { constant char *opt_name; void (*opt_func)(constant char*,size_t); };
struct mloption options[] = {
{ "ts=", set_tabs },
{ "tabstop=", set_tabs },
{ NULL, NULL }
};
struct mloption *opt;
for (opt = options; opt->opt_name != NULL; opt++)
{
size_t name_len = strlen(opt->opt_name);
if (opt_len > name_len && strncmp(str, opt->opt_name, name_len) == 0)
{
(*opt->opt_func)(str + name_len, opt_len - name_len);
break;
}
}
}
/*
* String length, terminated by option separator (space or colon).
* Space/colon can be escaped with backspace.
*/
static size_t modeline_option_len(constant char *str)
{
lbool esc = FALSE;
constant char *s;
for (s = str; *s != '\0'; s++)
{
if (esc)
esc = FALSE;
else if (*s == '\\')
esc = TRUE;
else if (*s == ' ' || *s == ':') /* separator */
break;
}
return ptr_diff(s, str);
}
/*
* Parse colon- or space-separated option settings in a modeline.
*/
static void modeline_options(constant char *str, char end_char)
{
for (;;)
{
size_t opt_len;
str = skipspc(str);
if (*str == '\0' || *str == end_char)
break;
opt_len = modeline_option_len(str);
modeline_option(str, opt_len);
str += opt_len;
if (*str != '\0')
str += 1; /* skip past the separator */
}
}
/*
* See if there is a modeline string in a line.
*/
static void check_modeline(constant char *line)
{
#if HAVE_STRSTR
static constant char *pgms[] = { "less:", "vim:", "vi:", "ex:", NULL };
constant char **pgm;
for (pgm = pgms; *pgm != NULL; ++pgm)
{
constant char *pline = line;
for (;;)
{
constant char *str;
pline = strstr(pline, *pgm);
if (pline == NULL) /* pgm is not in this line */
break;
str = skipspc(pline + strlen(*pgm));
if (pline == line || pline[-1] == ' ')
{
if (strncmp(str, "set ", 4) == 0)
modeline_options(str+4, ':');
else if (pgm != &pgms[0]) /* "less:" requires "set" */
modeline_options(str, '\0');
break;
}
/* Continue searching the rest of the line. */
pline = str;
}
}
#endif /* HAVE_STRSTR */
}
/*
* Read lines from start of file and check if any are modelines.
*/
static void check_modelines(void)
{
POSITION pos = ch_zero();
int i;
for (i = 0; i < modelines; i++)
{
constant char *line;
size_t line_len;
if (ABORT_SIGS())
return;
pos = forw_raw_line(pos, &line, &line_len);
if (pos == NULL_POSITION)
break;
check_modeline(line);
}
}
/*
* Close a pipe opened via popen.
*/
static void close_pipe(FILE *pipefd)
{
int status;
char *p;
PARG parg;
if (pipefd == NULL)
return;
#if OS2
/*
* The pclose function of OS/2 emx sometimes fails.
* Send SIGINT to the piped process before closing it.
*/
kill(pipefd->_pid, SIGINT);
#endif
status = pclose(pipefd);
if (status == -1)
{
/* An internal error in 'less', not a preprocessor error. */
p = errno_message("pclose");
parg.p_string = p;
error("%s", &parg);
free(p);
return;
}
if (!show_preproc_error)
return;
#if defined WIFEXITED && defined WEXITSTATUS
if (WIFEXITED(status))
{
int s = WEXITSTATUS(status);
if (s != 0)
{
parg.p_int = s;
error("Input preprocessor failed (status %d)", &parg);
}
return;
}
#endif
#if defined WIFSIGNALED && defined WTERMSIG
if (WIFSIGNALED(status))
{
int sig = WTERMSIG(status);
if (sig != SIGPIPE || ch_length() != NULL_POSITION)
{
parg.p_string = signal_message(sig);
error("Input preprocessor terminated: %s", &parg);
}
return;
}
#endif
if (status != 0)
{
parg.p_int = status;
error("Input preprocessor exited with status %x", &parg);
}
}
/*
* Drain and close an input pipe if needed.
*/
public void close_altpipe(IFILE ifile)
{
FILE *altpipe = get_altpipe(ifile);
if (altpipe != NULL && !(ch_getflags() & CH_KEEPOPEN))
{
close_pipe(altpipe);
set_altpipe(ifile, NULL);
}
}
/*
* Check for error status from the current altpipe.
* May or may not close the pipe.
*/
public void check_altpipe_error(void)
{
if (!show_preproc_error)
return;
if (curr_ifile != NULL_IFILE && get_altfilename(curr_ifile) != NULL)
close_altpipe(curr_ifile);
}
/*
* Close the current input file.
*/
static void close_file(void)
{
struct scrpos scrpos;
constant char *altfilename;
if (curr_ifile == NULL_IFILE)
return;
/*
* Save the current position so that we can return to
* the same position if we edit this file again.
*/
get_scrpos(&scrpos, TOP);
if (scrpos.pos != NULL_POSITION)
{
store_pos(curr_ifile, &scrpos);
lastmark();
}
/*
* Close the file descriptor, unless it is a pipe.
*/
ch_close();
/*
* If we opened a file using an alternate name,
* do special stuff to close it.
*/
altfilename = get_altfilename(curr_ifile);
if (altfilename != NULL)
{
close_altpipe(curr_ifile);
close_altfile(altfilename, get_filename(curr_ifile));
set_altfilename(curr_ifile, NULL);
}
curr_ifile = NULL_IFILE;
#if HAVE_STAT_INO
curr_ino = curr_dev = 0;
#endif
}
/*
* Edit a new file (given its name).
* Filename == "-" means standard input.
* Filename == NULL means just close the current file.
*/
public int edit(constant char *filename)
{
if (filename == NULL)
return (edit_ifile(NULL_IFILE));
return (edit_ifile(get_ifile(filename, curr_ifile)));
}
/*
* Clean up what edit_ifile did before error return.
*/
static int edit_error(constant char *filename, constant char *alt_filename, void *altpipe, IFILE ifile)
{
if (alt_filename != NULL)
{
close_pipe(altpipe);
close_altfile(alt_filename, filename);
free((char*)alt_filename); /* FIXME: WTF? */
}
del_ifile(ifile);
/*
* Re-open the current file.
*/
if (curr_ifile == ifile)
{
/*
* Whoops. The "current" ifile is the one we just deleted.
* Just give up.
*/
quit(QUIT_ERROR);
}
return (1);
}
/*
* Edit a new file (given its IFILE).
* ifile == NULL means just close the current file.
*/
public int edit_ifile(IFILE ifile)
{
int f;
int answer;
int chflags;
constant char *filename;
constant char *open_filename;
char *alt_filename;
void *altpipe;
IFILE was_curr_ifile;
char *p;
PARG parg;
ssize_t nread = 0;
if (ifile == curr_ifile)
{
/*
* Already have the correct file open.
*/
return (0);
}
new_file = TRUE;
if (ifile != NULL_IFILE)
{
/*
* See if LESSOPEN specifies an "alternate" file to open.
*/
filename = get_filename(ifile);
altpipe = get_altpipe(ifile);
if (altpipe != NULL)
{
/*
* File is already open.
* chflags and f are not used by ch_init if ifile has
* filestate which should be the case if we're here.
* Set them here to avoid uninitialized variable warnings.
*/
chflags = 0;
f = -1;
alt_filename = get_altfilename(ifile);
open_filename = (alt_filename != NULL) ? alt_filename : filename;
} else
{
if (strcmp(filename, FAKE_HELPFILE) == 0 ||
strcmp(filename, FAKE_EMPTYFILE) == 0)
alt_filename = NULL;
else
alt_filename = open_altfile(filename, &f, &altpipe);
open_filename = (alt_filename != NULL) ? alt_filename : filename;
chflags = 0;
if (altpipe != NULL)
{
/*
* The alternate "file" is actually a pipe.
* f has already been set to the file descriptor of the pipe
* in the call to open_altfile above.
* Keep the file descriptor open because it was opened
* via popen(), and pclose() wants to close it.
*/
chflags |= CH_POPENED;
if (strcmp(filename, "-") == 0)
chflags |= CH_KEEPOPEN;
} else if (strcmp(filename, "-") == 0)
{
/*
* Use standard input.
* Keep the file descriptor open because we can't reopen it.
*/
f = fd0;
chflags |= CH_KEEPOPEN;
/*
* Must switch stdin to BINARY mode.
*/
SET_BINARY(f);
#if MSDOS_COMPILER==DJGPPC
/*
* Setting stdin to binary by default causes
* Ctrl-C to not raise SIGINT. We must undo
* that side-effect.
*/
__djgpp_set_ctrl_c(1);
#endif
} else if (strcmp(open_filename, FAKE_EMPTYFILE) == 0)
{
f = -1;
chflags |= CH_NODATA;
} else if (strcmp(open_filename, FAKE_HELPFILE) == 0)
{
f = -1;
chflags |= CH_HELPFILE;
} else if ((p = bad_file(open_filename)) != NULL)
{
/*
* It looks like a bad file. Don't try to open it.
*/
parg.p_string = p;
error("%s", &parg);
free(p);
return edit_error(filename, alt_filename, altpipe, ifile);
} else if ((f = iopen(open_filename, OPEN_READ)) < 0)
{
/*
* Got an error trying to open it.
*/
char *p = errno_message(filename);
parg.p_string = p;
error("%s", &parg);
free(p);
return edit_error(filename, alt_filename, altpipe, ifile);
} else
{
chflags |= CH_CANSEEK;
if (bin_file(f, &nread) && !force_open && !opened(ifile))
{
/*
* Looks like a binary file.
* Ask user if we should proceed.
*/
parg.p_string = filename;
answer = query("\"%s\" may be a binary file. See it anyway? ", &parg);
if (answer != 'y' && answer != 'Y')
{
close(f);
return edit_error(filename, alt_filename, altpipe, ifile);
}
}
}
}
if (!force_open && f >= 0 && isatty(f))
{
PARG parg;
parg.p_string = filename;
error("%s is a terminal (use -f to open it)", &parg);
return edit_error(filename, alt_filename, altpipe, ifile);
}
}
#if LOGFILE
end_logfile();
#endif
was_curr_ifile = save_curr_ifile();
if (curr_ifile != NULL_IFILE)
{
int was_helpfile = (ch_getflags() & CH_HELPFILE);
close_file();
if (was_helpfile && held_ifile(was_curr_ifile) <= 1)
{
/*
* Don't keep the help file in the ifile list.
*/
del_ifile(was_curr_ifile);
was_curr_ifile = NULL_IFILE;
}
}
unsave_ifile(was_curr_ifile);
if (ifile == NULL_IFILE)
{
/*
* No new file to open.
* (Don't set old_ifile, because if you call edit_ifile(NULL),
* you're supposed to have saved curr_ifile yourself,
* and you'll restore it if necessary.)
*/
return (0);
}
/*
* Set up the new ifile.
* Get the saved position for the file.
*/
curr_ifile = ifile;
set_altfilename(curr_ifile, alt_filename);
set_altpipe(curr_ifile, altpipe);
set_open(curr_ifile); /* File has been opened */
get_pos(curr_ifile, &initial_scrpos);
ch_init(f, chflags, nread);
consecutive_nulls = 0;
check_modelines();
if (!(chflags & CH_HELPFILE))
{
if (was_curr_ifile != NULL_IFILE)
old_ifile = was_curr_ifile;
#if LOGFILE
if (namelogfile != NULL && is_tty)
use_logfile(namelogfile);
#endif
#if HAVE_STAT_INO
/* Remember the i-number and device of the opened file. */
if (strcmp(open_filename, "-") != 0)
{
struct stat statbuf;
int r = stat(open_filename, &statbuf);
if (r == 0)
{
curr_ino = statbuf.st_ino;
curr_dev = statbuf.st_dev;
}
}
#endif
if (every_first_cmd != NULL)
{
ungetsc(every_first_cmd);
ungetcc_end_command();
}
}
flush();
if (is_tty)
{
/*
* Output is to a real tty.
*/
/*
* Indicate there is nothing displayed yet.
*/
pos_clear();
clr_linenum();
#if HILITE_SEARCH
clr_hilite();
#endif
hshift = 0;
if (strcmp(filename, FAKE_HELPFILE) && strcmp(filename, FAKE_EMPTYFILE))
{
char *qfilename = shell_quote(filename);
cmd_addhist(ml_examine, qfilename, 1);
free(qfilename);
}
if (want_filesize)
scan_eof();
set_header(ch_zero());
}
return (0);
}
/*
* Edit a space-separated list of files.
* For each filename in the list, enter it into the ifile list.
* Then edit the first one.
*/
public int edit_list(char *filelist)
{
IFILE save_ifile;
constant char *good_filename;
constant char *filename;
char *gfilelist;
constant char *gfilename;
char *qfilename;
struct textlist tl_files;
struct textlist tl_gfiles;
save_ifile = save_curr_ifile();
good_filename = NULL;
/*
* Run thru each filename in the list.
* Try to glob the filename.
* If it doesn't expand, just try to open the filename.
* If it does expand, try to open each name in that list.
*/
init_textlist(&tl_files, filelist);
filename = NULL;
while ((filename = forw_textlist(&tl_files, filename)) != NULL)
{
gfilelist = lglob(filename);
init_textlist(&tl_gfiles, gfilelist);
gfilename = NULL;
while ((gfilename = forw_textlist(&tl_gfiles, gfilename)) != NULL)
{
qfilename = shell_unquote(gfilename);
if (edit(qfilename) == 0 && good_filename == NULL)
good_filename = get_filename(curr_ifile);
free(qfilename);
}
free(gfilelist);
}
/*
* Edit the first valid filename in the list.
*/
if (good_filename == NULL)
{
unsave_ifile(save_ifile);
return (1);
}
if (get_ifile(good_filename, curr_ifile) == curr_ifile)
{
/*
* Trying to edit the current file; don't reopen it.
*/
unsave_ifile(save_ifile);
return (0);
}
reedit_ifile(save_ifile);
return (edit(good_filename));
}
/*
* Edit the first file in the command line (ifile) list.
*/
public int edit_first(void)
{
if (nifile() == 0)
return (edit_stdin());
curr_ifile = NULL_IFILE;
return (edit_next(1));
}
/*
* Edit the last file in the command line (ifile) list.
*/
public int edit_last(void)
{
curr_ifile = NULL_IFILE;
return (edit_prev(1));
}
/*
* Edit the n-th next or previous file in the command line (ifile) list.
*/
static int edit_istep(IFILE h, int n, int dir)
{
IFILE next;
/*
* Skip n filenames, then try to edit each filename.
*/
for (;;)
{
next = (dir > 0) ? next_ifile(h) : prev_ifile(h);
if (--n < 0)
{
if (edit_ifile(h) == 0)
break;
}
if (next == NULL_IFILE)
{
/*
* Reached end of the ifile list.
*/
return (1);
}
if (ABORT_SIGS())
{
/*
* Interrupt breaks out, if we're in a long
* list of files that can't be opened.
*/
return (1);
}
h = next;
}
/*
* Found a file that we can edit.
*/
return (0);
}
static int edit_inext(IFILE h, int n)
{
return (edit_istep(h, n, +1));
}
public int edit_next(int n)
{
return edit_istep(curr_ifile, n, +1);
}
static int edit_iprev(IFILE h, int n)
{
return (edit_istep(h, n, -1));
}
public int edit_prev(int n)
{
return edit_istep(curr_ifile, n, -1);
}
/*
* Edit a specific file in the command line (ifile) list.
*/
public int edit_index(int n)
{
IFILE h;
h = NULL_IFILE;
do
{
if ((h = next_ifile(h)) == NULL_IFILE)
{
/*
* Reached end of the list without finding it.
*/
return (1);
}
} while (get_index(h) != n);
return (edit_ifile(h));
}
public IFILE save_curr_ifile(void)
{
if (curr_ifile != NULL_IFILE)
hold_ifile(curr_ifile, 1);
return (curr_ifile);
}
public void unsave_ifile(IFILE save_ifile)
{
if (save_ifile != NULL_IFILE)
hold_ifile(save_ifile, -1);
}
/*
* Reedit the ifile which was previously open.
*/
public void reedit_ifile(IFILE save_ifile)
{
IFILE next;
IFILE prev;
/*
* Try to reopen the ifile.
* Note that opening it may fail (maybe the file was removed),
* in which case the ifile will be deleted from the list.
* So save the next and prev ifiles first.
*/
unsave_ifile(save_ifile);
next = next_ifile(save_ifile);
prev = prev_ifile(save_ifile);
if (edit_ifile(save_ifile) == 0)
return;
/*
* If can't reopen it, open the next input file in the list.
*/
if (next != NULL_IFILE && edit_inext(next, 0) == 0)
return;
/*
* If can't open THAT one, open the previous input file in the list.
*/
if (prev != NULL_IFILE && edit_iprev(prev, 0) == 0)
return;
/*
* If can't even open that, we're stuck. Just quit.
*/
quit(QUIT_ERROR);
}
public void reopen_curr_ifile(void)
{
IFILE save_ifile = save_curr_ifile();
close_file();
reedit_ifile(save_ifile);
}
/*
* Edit standard input.
*/
public int edit_stdin(void)
{
if (isatty(fd0))
{
error("Missing filename (\"less --help\" for help)", NULL_PARG);
quit(QUIT_OK);
}
return (edit("-"));
}
/*
* Copy a file directly to standard output.
* Used if standard output is not a tty.
*/
public void cat_file(void)
{
int c;
while ((c = ch_forw_get()) != EOI)
putchr(c);
flush();
}
#if LOGFILE
#define OVERWRITE_OPTIONS "Overwrite, Append, Don't log, or Quit?"
/*
* If the user asked for a log file and our input file
* is standard input, create the log file.
* We take care not to blindly overwrite an existing file.
*/
public void use_logfile(constant char *filename)
{
int exists;
int answer;
PARG parg;
if (ch_getflags() & CH_CANSEEK)
/*
* Can't currently use a log file on a file that can seek.
*/
return;
/*
* {{ We could use access() here. }}
*/
exists = open(filename, OPEN_READ);
if (exists >= 0)
close(exists);
exists = (exists >= 0);
/*
* Decide whether to overwrite the log file or append to it.
* If it doesn't exist we "overwrite" it.
*/
if (!exists || force_logfile)
{
/*
* Overwrite (or create) the log file.
*/
answer = 'O';
} else
{
/*
* Ask user what to do.
*/
parg.p_string = filename;
answer = query("Warning: \"%s\" exists; "OVERWRITE_OPTIONS" ", &parg);
}
loop:
switch (answer)
{
case 'O': case 'o':
/*
* Overwrite: create the file.
*/
logfile = creat(filename, CREAT_RW);
break;
case 'A': case 'a':
/*
* Append: open the file and seek to the end.
*/
logfile = open(filename, OPEN_APPEND);
if (less_lseek(logfile, (less_off_t)0, SEEK_END) == BAD_LSEEK)
{
close(logfile);
logfile = -1;
}
break;
case 'D': case 'd':
/*
* Don't do anything.
*/
return;
default:
/*
* Eh?
*/
answer = query(OVERWRITE_OPTIONS" (Type \"O\", \"A\", \"D\" or \"Q\") ", NULL_PARG);
goto loop;
}