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
|
.\" $NetBSD: editline.3,v 1.92 2016/05/22 23:54:20 christos Exp $
.\"
.\" Copyright (c) 1997-2014 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This file was contributed to The NetBSD Foundation by Luke Mewburn.
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
.\"
.Dd May 22, 2016
.Dt EDITLINE 3
.Os
.Sh NAME
.Nm editline ,
.Nm el_init ,
.Nm el_init_fd ,
.Nm el_end ,
.Nm el_reset ,
.Nm el_gets ,
.Nm el_wgets ,
.Nm el_getc ,
.Nm el_wgetc ,
.Nm el_push ,
.Nm el_wpush ,
.Nm el_parse ,
.Nm el_wparse ,
.Nm el_set ,
.Nm el_wset ,
.Nm el_get ,
.Nm el_wget ,
.Nm el_source ,
.Nm el_resize ,
.Nm el_cursor ,
.Nm el_line ,
.Nm el_wline ,
.Nm el_insertstr ,
.Nm el_winsertstr ,
.Nm el_deletestr ,
.Nm el_wdeletestr ,
.Nm history_init ,
.Nm history_winit ,
.Nm history_end ,
.Nm history_wend ,
.Nm history ,
.Nm history_w ,
.Nm tok_init ,
.Nm tok_winit ,
.Nm tok_end ,
.Nm tok_wend ,
.Nm tok_reset ,
.Nm tok_wreset ,
.Nm tok_line ,
.Nm tok_wline ,
.Nm tok_str ,
.Nm tok_wstr
.Nd line editor, history and tokenization functions
.Sh LIBRARY
.Lb libedit
.Sh SYNOPSIS
.In histedit.h
.Ft EditLine *
.Fn el_init "const char *prog" "FILE *fin" "FILE *fout" "FILE *ferr"
.Ft EditLine *
.Fn el_init_fd "const char *prog" "FILE *fin" "FILE *fout" "FILE *ferr" "int fdin" "int fdout" "int fderr"
.Ft void
.Fn el_end "EditLine *e"
.Ft void
.Fn el_reset "EditLine *e"
.Ft const char *
.Fn el_gets "EditLine *e" "int *count"
.Ft const wchar_t *
.Fn el_wgets "EditLine *e" "int *count"
.Ft int
.Fn el_getc "EditLine *e" "char *ch"
.Ft int
.Fn el_wgetc "EditLine *e" "wchar_t *wc"
.Ft void
.Fn el_push "EditLine *e" "const char *mbs"
.Ft void
.Fn el_wpush "EditLine *e" "const wchar_t *wcs"
.Ft int
.Fn el_parse "EditLine *e" "int argc" "const char *argv[]"
.Ft int
.Fn el_wparse "EditLine *e" "int argc" "const wchar_t *argv[]"
.Ft int
.Fn el_set "EditLine *e" "int op" "..."
.Ft int
.Fn el_wset "EditLine *e" "int op" "..."
.Ft int
.Fn el_get "EditLine *e" "int op" "..."
.Ft int
.Fn el_wget "EditLine *e" "int op" "..."
.Ft int
.Fn el_source "EditLine *e" "const char *file"
.Ft void
.Fn el_resize "EditLine *e"
.Ft int
.Fn el_cursor "EditLine *e" "int count"
.Ft const LineInfo *
.Fn el_line "EditLine *e"
.Ft const LineInfoW *
.Fn el_wline "EditLine *e"
.Ft int
.Fn el_insertstr "EditLine *e" "const char *str"
.Ft int
.Fn el_winsertstr "EditLine *e" "const wchar_t *str"
.Ft void
.Fn el_deletestr "EditLine *e" "int count"
.Ft void
.Fn el_wdeletestr "EditLine *e" "int count"
.Ft History *
.Fn history_init void
.Ft HistoryW *
.Fn history_winit void
.Ft void
.Fn history_end "History *h"
.Ft void
.Fn history_wend "HistoryW *h"
.Ft int
.Fn history "History *h" "HistEvent *ev" "int op" "..."
.Ft int
.Fn history_w "HistoryW *h" "HistEventW *ev" "int op" "..."
.Ft Tokenizer *
.Fn tok_init "const char *IFS"
.Ft TokenizerW *
.Fn tok_winit "const wchar_t *IFS"
.Ft void
.Fn tok_end "Tokenizer *t"
.Ft void
.Fn tok_wend "TokenizerW *t"
.Ft void
.Fn tok_reset "Tokenizer *t"
.Ft void
.Fn tok_wreset "TokenizerW *t"
.Ft int
.Fn tok_line "Tokenizer *t" "const LineInfo *li" "int *argc" "const char **argv[]" "int *cursorc" "int *cursoro"
.Ft int
.Fn tok_wline "TokenizerW *t" "const LineInfoW *li" "int *argc" "const wchar_t **argv[]" "int *cursorc" "int *cursoro"
.Ft int
.Fn tok_str "Tokenizer *t" "const char *str" "int *argc" "const char **argv[]"
.Ft int
.Fn tok_wstr "TokenizerW *t" "const wchar_t *str" "int *argc" "const wchar_t **argv[]"
.Sh DESCRIPTION
The
.Nm
library provides generic line editing, history and tokenization functions,
similar to those found in
.Xr sh 1 .
.Pp
These functions are available in the
.Nm libedit
library (which needs the
.Nm libtermcap
library).
Programs should be linked with
.Fl ledit ltermcap .
.Pp
The
.Nm
library respects the
.Ev LC_CTYPE
locale set by the application program and never uses
.Xr setlocale 3
to change the locale.
The only locales supported are UTF-8 and the default C or POSIX locale.
If any other locale is set, behaviour is undefined.
.Sh LINE EDITING FUNCTIONS
The line editing functions use a common data structure,
.Fa EditLine ,
which is created by
.Fn el_init
or
.Fn el_init_fd
and freed by
.Fn el_end .
.Pp
The wide-character functions behave the same way as their narrow
counterparts.
.Pp
The following functions are available:
.Bl -tag -width 4n
.It Fn el_init
Initialize the line editor, and return a data structure
to be used by all other line editing functions, or
.Dv NULL
on failure.
.Fa prog
is the name of the invoking program, used when reading the
.Xr editrc 5
file to determine which settings to use.
.Fa fin ,
.Fa fout
and
.Fa ferr
are the input, output, and error streams (respectively) to use.
In this documentation, references to
.Dq the tty
are actually to this input/output stream combination.
.It Fn el_init_fd
Like
.Fn el_init
but allows specifying file descriptors for the
.Xr stdio 3
corresponding streams, in case those were created with
.Xr funopen 3 .
.It Fn el_end
Clean up and finish with
.Fa e ,
assumed to have been created with
.Fn el_init
or
.Fn el_init_fd .
.It Fn el_reset
Reset the tty and the parser.
This should be called after an error which may have upset the tty's
state.
.It Fn el_gets
Read a line from the tty.
.Fa count
is modified to contain the number of characters read.
Returns the line read if successful, or
.Dv NULL
if no characters were read or if an error occurred.
If an error occurred,
.Fa count
is set to \-1 and
.Dv errno
contains the error code that caused it.
The return value may not remain valid across calls to
.Fn el_gets
and must be copied if the data is to be retained.
.It Fn el_wgetc
Read a wide character from the tty, respecting the current locale,
or from the input queue described in
.Xr editline 7
if that is not empty, and store it in
.Fa wc .
If an invalid or incomplete character is found, it is discarded,
.Va errno
is set to
.Er EILSEQ ,
and the next character is read and stored in
.Fa wc .
Returns 1 if a valid character was read, 0 on end of file, or \-1 on
.Xr read 2
failure.
In the latter case,
.Va errno
is set to indicate the error.
.It Fn el_getc
Read a wide character as described for
.Fn el_wgetc
and return 0 on end of file or \-1 on failure.
If the wide character can be represented as a single-byte character,
convert it with
.Xr wctob 3 ,
store the result in
.Fa ch ,
and return 1; otherwise, set
.Va errno
to
.Er ERANGE
and return \-1.
In the C or POSIX locale, this simply reads a byte, but for any other
locale, including UTF-8, this is rarely useful.
.It Fn el_wpush
Push the wide character string
.Fa wcs
back onto the input queue described in
.Xr editline 7 .
If the queue overflows, for example due to a recursive macro,
or if an error occurs, for example because
.Fa wcs
is
.Dv NULL
or memory allocation fails, the function beeps at the user,
but does not report the problem to the caller.
.It Fn el_push
Use the current locale to convert the multibyte string
.Fa mbs
to a wide character string, and pass the result to
.Fn el_wpush .
.It Fn el_parse
Parses the
.Fa argv
array (which is
.Fa argc
elements in size)
to execute builtin
.Nm
commands.
If the command is prefixed with
.Dq prog :
then
.Fn el_parse
will only execute the command if
.Dq prog
matches the
.Fa prog
argument supplied to
.Fn el_init .
The return value is
\-1 if the command is unknown,
0 if there was no error or
.Dq prog
didn't match, or
1 if the command returned an error.
Refer to
.Xr editrc 5
for more information.
.It Fn el_set
Set
.Nm
parameters.
.Fa op
determines which parameter to set, and each operation has its
own parameter list.
Returns 0 on success, \-1 on failure.
.Pp
The following values for
.Fa op
are supported, along with the required argument list:
.Bl -tag -width 4n
.It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)"
Define prompt printing function as
.Fa f ,
which is to return a string that contains the prompt.
.It Dv EL_PROMPT_ESC , Fa "char *(*f)(EditLine *)" , Fa "char c"
Same as
.Dv EL_PROMPT ,
but the
.Fa c
argument indicates the start/stop literal prompt character.
.Pp
If a start/stop literal character is found in the prompt, the
character itself
is not printed, but characters after it are printed directly to the
terminal without affecting the state of the current line.
A subsequent second start/stop literal character ends this behavior.
This is typically used to embed literal escape sequences that change the
color/style of the terminal in the prompt.
.Dv 0
unsets it.
.It Dv EL_REFRESH
Re-display the current line on the next terminal line.
.It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)"
Define right side prompt printing function as
.Fa f ,
which is to return a string that contains the prompt.
.It Dv EL_RPROMPT_ESC , Fa "char *(*f)(EditLine *)" , Fa "char c"
Define the right prompt printing function but with a literal escape character.
.It Dv EL_TERMINAL , Fa "const char *type"
Define terminal type of the tty to be
.Fa type ,
or to
.Ev TERM
if
.Fa type
is
.Dv NULL .
.It Dv EL_EDITOR , Fa "const char *mode"
Set editing mode to
.Fa mode ,
which must be one of
.Dq emacs
or
.Dq vi .
.It Dv EL_SIGNAL , Fa "int flag"
If
.Fa flag
is non-zero,
.Nm
will install its own signal handler for the following signals when
reading command input:
.Dv SIGCONT ,
.Dv SIGHUP ,
.Dv SIGINT ,
.Dv SIGQUIT ,
.Dv SIGSTOP ,
.Dv SIGTERM ,
.Dv SIGTSTP ,
and
.Dv SIGWINCH .
Otherwise, the current signal handlers will be used.
.It Dv EL_BIND , Fa "const char *" , Fa "..." , Dv NULL
Perform the
.Ic bind
builtin command.
Refer to
.Xr editrc 5
for more information.
.It Dv EL_ECHOTC , Fa "const char *" , Fa "..." , Dv NULL
Perform the
.Ic echotc
builtin command.
Refer to
.Xr editrc 5
for more information.
.It Dv EL_SETTC , Fa "const char *" , Fa "..." , Dv NULL
Perform the
.Ic settc
builtin command.
Refer to
.Xr editrc 5
for more information.
.It Dv EL_SETTY , Fa "const char *" , Fa "..." , Dv NULL
Perform the
.Ic setty
builtin command.
Refer to
.Xr editrc 5
for more information.
.It Dv EL_TELLTC , Fa "const char *" , Fa "..." , Dv NULL
Perform the
.Ic telltc
builtin command.
Refer to
.Xr editrc 5
for more information.
.It Dv EL_ADDFN , Fa "const char *name" , Fa "const char *help" , \
Fa "unsigned char (*func)(EditLine *e, int ch)"
Add a user defined function,
.Fn func ,
referred to as
.Fa name
which is invoked when a key which is bound to
.Fa name
is entered.
.Fa help
is a description of
.Fa name .
At invocation time,
.Fa ch
is the key which caused the invocation.
The return value of
.Fn func
should be one of:
.Bl -tag -width "CC_REDISPLAY"
.It Dv CC_NORM
Add a normal character.
.It Dv CC_NEWLINE
End of line was entered.
.It Dv CC_EOF
EOF was entered.
.It Dv CC_ARGHACK
Expecting further command input as arguments, do nothing visually.
.It Dv CC_REFRESH
Refresh display.
.It Dv CC_REFRESH_BEEP
Refresh display, and beep.
.It Dv CC_CURSOR
Cursor moved, so update and perform
.Dv CC_REFRESH .
.It Dv CC_REDISPLAY
Redisplay entire input line.
This is useful if a key binding outputs extra information.
.It Dv CC_ERROR
An error occurred.
Beep, and flush tty.
.It Dv CC_FATAL
Fatal error, reset tty to known state.
.El
.It Dv EL_HIST , Fa "History *(*func)(History *, int op, ...)" , \
Fa "const char *ptr"
Defines which history function to use, which is usually
.Fn history .
.Fa ptr
should be the value returned by
.Fn history_init .
.It Dv EL_EDITMODE , Fa "int flag"
If
.Fa flag
is non-zero,
editing is enabled (the default).
Note that this is only an indication, and does not
affect the operation of
.Nm .
At this time, it is the caller's responsibility to
check this
(using
.Fn el_get )
to determine if editing should be enabled or not.
.It Dv EL_UNBUFFERED , Fa "int flag"
If
.Fa flag
is zero,
unbuffered mode is disabled (the default).
In unbuffered mode,
.Fn el_gets
will return immediately after processing a single character.
.It Dv EL_GETCFN , Fa "el_rfunc_t f"
Whenever reading a character, use the function
.Bd -ragged -offset indent -compact
.Ft int
.Fo f
.Fa "EditLine *e"
.Fa "wchar_t *wc"
.Fc
.Ed
which stores the character in
.Fa wc
and returns 1 on success, 0 on end of file, or \-1 on I/O or encoding
errors.
Functions internally using it include
.Fn el_wgets ,
.Fn el_wgetc ,
.Fn el_gets ,
and
.Fn el_getc .
Initially, a builtin function is installed, and replacing it
is discouraged because writing such a function is very error prone.
The builtin function can be restored at any time by passing the
special value
.Dv EL_BUILTIN_GETCFN
instead of a function pointer.
.It Dv EL_CLIENTDATA , Fa "void *data"
Register
.Fa data
to be associated with this EditLine structure.
It can be retrieved with the corresponding
.Fn el_get
call.
.It Dv EL_SETFP , Fa "int fd" , Fa "FILE *fp"
Set the current
.Nm editline
file pointer for
.Dq input
.Fa fd
=
.Dv 0 ,
.Dq output
.Fa fd
=
.Dv 1 ,
or
.Dq error
.Fa fd
=
.Dv 2
from
.Fa fp .
.El
.It Fn el_get
Get
.Nm
parameters.
.Fa op
determines which parameter to retrieve into
.Fa result .
Returns 0 if successful, \-1 otherwise.
.Pp
The following values for
.Fa op
are supported, along with actual type of
.Fa result :
.Bl -tag -width 4n
.It Dv EL_PROMPT , Fa "char *(*f)(EditLine *)" , Fa "char *c"
Set
.Fa f
to a pointer to the function that displays the prompt.
If
.Fa c
is not
.Dv NULL ,
set it to the start/stop literal prompt character.
.It Dv EL_RPROMPT , Fa "char *(*f)(EditLine *)" , Fa "char *c"
Set
.Fa f
to a pointer to the function that displays the prompt.
If
.Fa c
is not
.Dv NULL ,
set it to the start/stop literal prompt character.
.It Dv EL_EDITOR , Fa "const char **n"
Set the name of the editor in
.Fa n ,
which will be one of
.Dq emacs
or
.Dq vi .
.It Dv EL_GETTC , Fa "const char *name" , Fa "void *value"
If
.Fa name
is a valid
.Xr termcap 5
capability set
.Fa value
to the current value of that capability.
.It Dv EL_SIGNAL , Fa "int *s"
Set
.Fa s
to non-zero if
.Nm
has installed private signal handlers (see
.Fn el_get
above).
.It Dv EL_EDITMODE , Fa "int *c"
Set
.Fa c
to non-zero if editing is enabled.
.It Dv EL_GETCFN , Fa "el_rfunc_t *f"
Set
.Fa f
to a pointer to the function that reads characters, or to
.Dv EL_BUILTIN_GETCFN
if the builtin function is in use.
.It Dv EL_CLIENTDATA , Fa "void **data"
Set
.Fa data
to the previously registered client data set by an
.Fn el_set
call.
.It Dv EL_UNBUFFERED , Fa "int *c"
Set
.Fa c
to non-zero if unbuffered mode is enabled.
.It Dv EL_GETFP , Fa "int fd", Fa "FILE **fp"
Set
.Fa fp
to the current
.Nm editline
file pointer for
.Dq input
.Fa fd
=
.Dv 0 ,
.Dq output
.Fa fd
=
.Dv 1 ,
or
.Dq error
.Fa fd
=
.Dv 2 .
.El
.It Fn el_source
Initialize
.Nm
by reading the contents of
.Fa file .
.Fn el_parse
is called for each line in
.Fa file .
If
.Fa file
is
.Dv NULL ,
try
.Pa $HOME/.editrc .
Refer to
.Xr editrc 5
for details on the format of
.Fa file .
.Fn el_source
returns 0 on success and \-1 on error.
.It Fn el_resize
Must be called if the terminal size changes.
If
.Dv EL_SIGNAL
has been set with
.Fn el_set ,
then this is done automatically.
Otherwise, it's the responsibility of the application to call
.Fn el_resize
on the appropriate occasions.
.It Fn el_cursor
Move the cursor to the right (if positive) or to the left (if negative)
.Fa count
characters.
Returns the resulting offset of the cursor from the beginning of the line.
.It Fn el_line
Return the editing information for the current line in a
.Fa LineInfo
structure, which is defined as follows:
.Bd -literal
typedef struct lineinfo {
const char *buffer; /* address of buffer */
const char *cursor; /* address of cursor */
const char *lastchar; /* address of last character */
} LineInfo;
.Ed
.Pp
.Fa buffer
is not NUL terminated.
This function may be called after
.Fn el_gets
to obtain the
.Fa LineInfo
structure pertaining to line returned by that function,
and from within user defined functions added with
.Dv EL_ADDFN .
.It Fn el_insertstr
Insert
.Fa str
into the line at the cursor.
Returns \-1 if
.Fa str
is empty or won't fit, and 0 otherwise.
.It Fn el_deletestr
Delete
.Fa count
characters before the cursor.
.El
.Sh HISTORY LIST FUNCTIONS
The history functions use a common data structure,
.Fa History ,
which is created by
.Fn history_init
and freed by
.Fn history_end .
.Pp
The following functions are available:
.Bl -tag -width 4n
.It Fn history_init
Initialize the history list, and return a data structure
to be used by all other history list functions, or
.Dv NULL
on failure.
.It Fn history_end
Clean up and finish with
.Fa h ,
assumed to have been created with
.Fn history_init .
.It Fn history
Perform operation
.Fa op
on the history list, with optional arguments as needed by the
operation.
.Fa ev
is changed accordingly to operation.
The following values for
.Fa op
are supported, along with the required argument list:
.Bl -tag -width 4n
.It Dv H_SETSIZE , Fa "int size"
Set size of history to
.Fa size
elements.
.It Dv H_GETSIZE
Get number of events currently in history.
.It Dv H_END
Cleans up and finishes with
.Fa h ,
assumed to be created with
.Fn history_init .
.It Dv H_CLEAR
Clear the history.
.It Dv H_FUNC , Fa "void *ptr" , Fa "history_gfun_t first" , \
Fa "history_gfun_t next" , Fa "history_gfun_t last" , \
Fa "history_gfun_t prev" , Fa "history_gfun_t curr" , \
Fa "history_sfun_t set" , Fa "history_vfun_t clear" , \
Fa "history_efun_t enter" , Fa "history_efun_t add"
Define functions to perform various history operations.
.Fa ptr
is the argument given to a function when it's invoked.
.It Dv H_FIRST
Return the first element in the history.
.It Dv H_LAST
Return the last element in the history.
.It Dv H_PREV
Return the previous element in the history.
It is newer than the current one.
.It Dv H_NEXT
Return the next element in the history.
It is older than the current one.
.It Dv H_CURR
Return the current element in the history.
.It Dv H_SET
Set the cursor to point to the requested element.
.It Dv H_ADD , Fa "const char *str"
Append
.Fa str
to the current element of the history, or perform the
.Dv H_ENTER
operation with argument
.Fa str
if there is no current element.
.It Dv H_APPEND , Fa "const char *str"
Append
.Fa str
to the last new element of the history.
.It Dv H_ENTER , Fa "const char *str"
Add
.Fa str
as a new element to the history and, if necessary,
removing the oldest entry to keep the list to the created size.
If
.Dv H_SETUNIQUE
has been called with a non-zero argument, the element
will not be entered into the history if its contents match
the ones of the current history element.
If the element is entered
.Fn history
returns 1; if it is ignored as a duplicate returns 0.
Finally
.Fn history
returns \-1 if an error occurred.
.It Dv H_PREV_STR , Fa "const char *str"
Return the closest previous event that starts with
.Fa str .
.It Dv H_NEXT_STR , Fa "const char *str"
Return the closest next event that starts with
.Fa str .
.It Dv H_PREV_EVENT , Fa "int e"
Return the previous event numbered
.Fa e .
.It Dv H_NEXT_EVENT , Fa "int e"
Return the next event numbered
.Fa e .
.It Dv H_LOAD , Fa "const char *file"
Load the history list stored in
.Fa file .
.It Dv H_SAVE , Fa "const char *file"
Save the history list to
.Fa file .
.It Dv H_SAVE_FP , Fa "FILE *fp"
Save the history list to the opened
.Ft FILE
pointer
.Fa fp .
.It Dv H_SETUNIQUE , Fa "int unique"
Set flag that adjacent identical event strings should not be entered
into the history.
.It Dv H_GETUNIQUE
Retrieve the current setting if adjacent identical elements should
be entered into the history.
.It Dv H_DEL , Fa "int e"
Delete the event numbered
.Fa e .
This function is only provided for
.Xr readline 3
compatibility.
The caller is responsible for free'ing the string in the returned
.Fa HistEvent .
.El
.Pp
.Fn history
returns \*[Gt]= 0 if the operation
.Fa op
succeeds.
Otherwise, \-1 is returned and
.Fa ev
is updated to contain more details about the error.
.El
.Sh TOKENIZATION FUNCTIONS
The tokenization functions use a common data structure,
.Fa Tokenizer ,
which is created by
.Fn tok_init
and freed by
.Fn tok_end .
.Pp
The following functions are available:
.Bl -tag -width 4n
.It Fn tok_init
Initialize the tokenizer, and return a data structure
to be used by all other tokenizer functions.
.Fa IFS
contains the Input Field Separators, which defaults to
.Aq space ,
.Aq tab ,
and
.Aq newline
if
.Dv NULL .
.It Fn tok_end
Clean up and finish with
.Fa t ,
assumed to have been created with
.Fn tok_init .
.It Fn tok_reset
Reset the tokenizer state.
Use after a line has been successfully tokenized
by
.Fn tok_line
or
.Fn tok_str
and before a new line is to be tokenized.
.It Fn tok_line
Tokenize
.Fa li ,
If successful, modify:
.Fa argv
to contain the words,
.Fa argc
to contain the number of words,
.Fa cursorc
(if not
.Dv NULL )
to contain the index of the word containing the cursor,
and
.Fa cursoro
(if not
.Dv NULL )
to contain the offset within
.Fa argv[cursorc]
of the cursor.
.Pp
Returns
0 if successful,
\-1 for an internal error,
1 for an unmatched single quote,
2 for an unmatched double quote,
and
3 for a backslash quoted
.Aq newline .
A positive exit code indicates that another line should be read
and tokenization attempted again.
.
.It Fn tok_str
A simpler form of
.Fn tok_line ;
.Fa str
is a NUL terminated string to tokenize.
.El
.
.\"XXX.Sh EXAMPLES
.\"XXX: provide some examples
.Sh SEE ALSO
.Xr sh 1 ,
.Xr signal 3 ,
.Xr termcap 3 ,
.Xr editrc 5 ,
.Xr termcap 5 ,
.Xr editline 7
.Sh HISTORY
The
.Nm
library first appeared in
.Bx 4.4 .
.Dv CC_REDISPLAY
appeared in
.Nx 1.3 .
.Dv CC_REFRESH_BEEP ,
.Dv EL_EDITMODE
and the readline emulation appeared in
.Nx 1.4 .
.Dv EL_RPROMPT
appeared in
.Nx 1.5 .
.Sh AUTHORS
.An -nosplit
The
.Nm
library was written by
.An Christos Zoulas .
.An Luke Mewburn
wrote this manual and implemented
.Dv CC_REDISPLAY ,
.Dv CC_REFRESH_BEEP ,
.Dv EL_EDITMODE ,
and
.Dv EL_RPROMPT .
.An Jaromir Dolecek
implemented the readline emulation.
.An Johny Mattsson
implemented wide-character support.
.Sh BUGS
At this time, it is the responsibility of the caller to
check the result of the
.Dv EL_EDITMODE
operation of
.Fn el_get
(after an
.Fn el_source
or
.Fn el_parse )
to determine if
.Nm
should be used for further input.
I.e.,
.Dv EL_EDITMODE
is purely an indication of the result of the most recent
.Xr editrc 5
.Ic edit
command.
|