-
Notifications
You must be signed in to change notification settings - Fork 120
/
linenoise.c
2366 lines (2122 loc) · 64.5 KB
/
linenoise.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
#ifndef STRINGBUF_H
#define STRINGBUF_H
/**
* resizable string buffer
*
* (c) 2017-2020 Steve Bennett <steveb@workware.net.au>
*
* See utf8.c for licence details.
*/
#ifdef __cplusplus
extern "C" {
#endif
/** @file
* A stringbuf is a resizing, null terminated string buffer.
*
* The buffer is reallocated as necessary.
*
* In general it is *not* OK to call these functions with a NULL pointer
* unless stated otherwise.
*
* If USE_UTF8 is defined, supports utf8.
*/
/**
* The stringbuf structure should not be accessed directly.
* Use the functions below.
*/
typedef struct {
int remaining; /**< Allocated, but unused space */
int last; /**< Index of the null terminator (and thus the length of the string) */
#ifdef USE_UTF8
int chars; /**< Count of characters */
#endif
char *data; /**< Allocated memory containing the string or NULL for empty */
} stringbuf;
/**
* Allocates and returns a new stringbuf with no elements.
*/
stringbuf *sb_alloc(void);
/**
* Frees a stringbuf.
* It is OK to call this with NULL.
*/
void sb_free(stringbuf *sb);
/**
* Returns an allocated copy of the stringbuf
*/
stringbuf *sb_copy(stringbuf *sb);
/**
* Returns the byte length of the buffer.
*
* Returns 0 for both a NULL buffer and an empty buffer.
*/
static inline int sb_len(stringbuf *sb) {
return sb->last;
}
/**
* Returns the utf8 character length of the buffer.
*
* Returns 0 for both a NULL buffer and an empty buffer.
*/
static inline int sb_chars(stringbuf *sb) {
#ifdef USE_UTF8
return sb->chars;
#else
return sb->last;
#endif
}
/**
* Appends a null terminated string to the stringbuf
*/
void sb_append(stringbuf *sb, const char *str);
/**
* Like sb_append() except does not require a null terminated string.
* The length of 'str' is given as 'len'
*
* Note that in utf8 mode, characters will *not* be counted correctly
* if a partial utf8 sequence is added with sb_append_len()
*/
void sb_append_len(stringbuf *sb, const char *str, int len);
/**
* Returns a pointer to the null terminated string in the buffer.
*
* Note this pointer only remains valid until the next modification to the
* string buffer.
*
* The returned pointer can be used to update the buffer in-place
* as long as care is taken to not overwrite the end of the buffer.
*/
static inline char *sb_str(const stringbuf *sb)
{
return sb->data;
}
/**
* Inserts the given string *before* (zero-based) byte 'index' in the stringbuf.
* If index is past the end of the buffer, the string is appended,
* just like sb_append()
*/
void sb_insert(stringbuf *sb, int index, const char *str);
/**
* Delete 'len' bytes in the string at the given index.
*
* Any bytes past the end of the buffer are ignored.
* The buffer remains null terminated.
*
* If len is -1, deletes to the end of the buffer.
*/
void sb_delete(stringbuf *sb, int index, int len);
/**
* Clear to an empty buffer.
*/
void sb_clear(stringbuf *sb);
/**
* Return an allocated copy of buffer and frees 'sb'.
*
* If 'sb' is empty, returns an allocated copy of "".
*/
char *sb_to_string(stringbuf *sb);
#ifdef __cplusplus
}
#endif
#endif
/**
* resizable string buffer
*
* (c) 2017-2020 Steve Bennett <steveb@workware.net.au>
*
* See utf8.c for licence details.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <assert.h>
#ifndef STRINGBUF_H
#include "stringbuf.h"
#endif
#ifdef USE_UTF8
#ifndef UTF8_UTIL_H
#include "utf8.h"
#endif
#endif
#define SB_INCREMENT 200
stringbuf *sb_alloc(void)
{
stringbuf *sb = (stringbuf *)malloc(sizeof(*sb));
sb->remaining = 0;
sb->last = 0;
#ifdef USE_UTF8
sb->chars = 0;
#endif
sb->data = NULL;
return(sb);
}
void sb_free(stringbuf *sb)
{
if (sb) {
free(sb->data);
}
free(sb);
}
void sb_realloc(stringbuf *sb, int newlen)
{
sb->data = (char *)realloc(sb->data, newlen);
sb->remaining = newlen - sb->last;
}
void sb_append(stringbuf *sb, const char *str)
{
sb_append_len(sb, str, strlen(str));
}
void sb_append_len(stringbuf *sb, const char *str, int len)
{
if (sb->remaining < len + 1) {
sb_realloc(sb, sb->last + len + 1 + SB_INCREMENT);
}
memcpy(sb->data + sb->last, str, len);
sb->data[sb->last + len] = 0;
sb->last += len;
sb->remaining -= len;
#ifdef USE_UTF8
sb->chars += utf8_strlen(str, len);
#endif
}
char *sb_to_string(stringbuf *sb)
{
if (sb->data == NULL) {
/* Return an allocated empty string, not null */
return strdup("");
}
else {
/* Just return the data and free the stringbuf structure */
char *pt = sb->data;
free(sb);
return pt;
}
}
/* Insert and delete operations */
/* Moves up all the data at position 'pos' and beyond by 'len' bytes
* to make room for new data
*
* Note: Does *not* update sb->chars
*/
static void sb_insert_space(stringbuf *sb, int pos, int len)
{
assert(pos <= sb->last);
/* Make sure there is enough space */
if (sb->remaining < len) {
sb_realloc(sb, sb->last + len + SB_INCREMENT);
}
/* Now move it up */
memmove(sb->data + pos + len, sb->data + pos, sb->last - pos);
sb->last += len;
sb->remaining -= len;
/* And null terminate */
sb->data[sb->last] = 0;
}
/**
* Move down all the data from pos + len, effectively
* deleting the data at position 'pos' of length 'len'
*/
static void sb_delete_space(stringbuf *sb, int pos, int len)
{
assert(pos < sb->last);
assert(pos + len <= sb->last);
#ifdef USE_UTF8
sb->chars -= utf8_strlen(sb->data + pos, len);
#endif
/* Now move it up */
memmove(sb->data + pos, sb->data + pos + len, sb->last - pos - len);
sb->last -= len;
sb->remaining += len;
/* And null terminate */
sb->data[sb->last] = 0;
}
void sb_insert(stringbuf *sb, int index, const char *str)
{
if (index >= sb->last) {
/* Inserting after the end of the list appends. */
sb_append(sb, str);
}
else {
int len = strlen(str);
sb_insert_space(sb, index, len);
memcpy(sb->data + index, str, len);
#ifdef USE_UTF8
sb->chars += utf8_strlen(str, len);
#endif
}
}
/**
* Delete the bytes at index 'index' for length 'len'
* Has no effect if the index is past the end of the list.
*/
void sb_delete(stringbuf *sb, int index, int len)
{
if (index < sb->last) {
char *pos = sb->data + index;
if (len < 0) {
len = sb->last;
}
sb_delete_space(sb, pos - sb->data, len);
}
}
void sb_clear(stringbuf *sb)
{
if (sb->data) {
/* Null terminate */
sb->data[0] = 0;
sb->last = 0;
#ifdef USE_UTF8
sb->chars = 0;
#endif
}
}
/* linenoise.c -- guerrilla line editing library against the idea that a
* line editing lib needs to be 20,000 lines of C code.
*
* You can find the latest source code at:
*
* http://github.com/msteveb/linenoise
* (forked from http://github.com/antirez/linenoise)
*
* Does a number of crazy assumptions that happen to be true in 99.9999% of
* the 2010 UNIX computers around.
*
* ------------------------------------------------------------------------
*
* Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
* Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
* Copyright (c) 2011, Steve Bennett <steveb at workware dot net dot au>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER 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.
*
* ------------------------------------------------------------------------
*
* References:
* - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
* - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
*
* Bloat:
* - Completion?
*
* Unix/termios
* ------------
* List of escape sequences used by this program, we do everything just
* a few sequences. In order to be so cheap we may have some
* flickering effect with some slow terminal, but the lesser sequences
* the more compatible.
*
* EL (Erase Line)
* Sequence: ESC [ 0 K
* Effect: clear from cursor to end of line
*
* CUF (CUrsor Forward)
* Sequence: ESC [ n C
* Effect: moves cursor forward n chars
*
* CR (Carriage Return)
* Sequence: \r
* Effect: moves cursor to column 1
*
* The following are used to clear the screen: ESC [ H ESC [ 2 J
* This is actually composed of two sequences:
*
* cursorhome
* Sequence: ESC [ H
* Effect: moves the cursor to upper left corner
*
* ED2 (Clear entire screen)
* Sequence: ESC [ 2 J
* Effect: clear the whole screen
*
* == For highlighting control characters, we also use the following two ==
* SO (enter StandOut)
* Sequence: ESC [ 7 m
* Effect: Uses some standout mode such as reverse video
*
* SE (Standout End)
* Sequence: ESC [ 0 m
* Effect: Exit standout mode
*
* == Only used if TIOCGWINSZ fails ==
* DSR/CPR (Report cursor position)
* Sequence: ESC [ 6 n
* Effect: reports current cursor position as ESC [ NNN ; MMM R
*
* == Only used in multiline mode ==
* CUU (Cursor Up)
* Sequence: ESC [ n A
* Effect: moves cursor up n chars.
*
* CUD (Cursor Down)
* Sequence: ESC [ n B
* Effect: moves cursor down n chars.
*
* win32/console
* -------------
* If __MINGW32__ is defined, the win32 console API is used.
* This could probably be made to work for the msvc compiler too.
* This support based in part on work by Jon Griffiths.
*/
#ifdef _WIN32 /* Windows platform, either MinGW or Visual Studio (MSVC) */
#include <windows.h>
#include <fcntl.h>
#define USE_WINCONSOLE
#ifdef __MINGW32__
#define HAVE_UNISTD_H
#else
/* Microsoft headers don't like old POSIX names */
#define strdup _strdup
#define snprintf _snprintf
#endif
#else
#include <termios.h>
#include <sys/ioctl.h>
#include <poll.h>
#define USE_TERMIOS
#define HAVE_UNISTD_H
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>
#include "linenoise.h"
#ifndef STRINGBUF_H
#include "stringbuf.h"
#endif
#ifndef UTF8_UTIL_H
#include "utf8.h"
#endif
#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
/* ctrl('A') -> 0x01 */
#define ctrl(C) ((C) - '@')
/* meta('a') -> 0xe1 */
#define meta(C) ((C) | 0x80)
/* Use -ve numbers here to co-exist with normal unicode chars */
enum {
SPECIAL_NONE,
/* don't use -1 here since that indicates error */
SPECIAL_UP = -20,
SPECIAL_DOWN = -21,
SPECIAL_LEFT = -22,
SPECIAL_RIGHT = -23,
SPECIAL_DELETE = -24,
SPECIAL_HOME = -25,
SPECIAL_END = -26,
SPECIAL_INSERT = -27,
SPECIAL_PAGE_UP = -28,
SPECIAL_PAGE_DOWN = -29,
/* Some handy names for other special keycodes */
CHAR_ESCAPE = 27,
CHAR_DELETE = 127,
};
static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
static int history_len = 0;
static char **history = NULL;
/* Structure to contain the status of the current (being edited) line */
struct current {
stringbuf *buf; /* Current buffer. Always null terminated */
int pos; /* Cursor position, measured in chars */
int cols; /* Size of the window, in chars */
int nrows; /* How many rows are being used in multiline mode (>= 1) */
int rpos; /* The current row containing the cursor - multiline mode only */
int colsright; /* refreshLine() cached cols for insert_char() optimisation */
int colsleft; /* refreshLine() cached cols for remove_char() optimisation */
const char *prompt;
stringbuf *capture; /* capture buffer, or NULL for none. Always null terminated */
stringbuf *output; /* used only during refreshLine() - output accumulator */
#if defined(USE_TERMIOS)
int fd; /* Terminal fd */
#elif defined(USE_WINCONSOLE)
HANDLE outh; /* Console output handle */
HANDLE inh; /* Console input handle */
int rows; /* Screen rows */
int x; /* Current column during output */
int y; /* Current row */
#ifdef USE_UTF8
#define UBUF_MAX_CHARS 132
WORD ubuf[UBUF_MAX_CHARS + 1]; /* Accumulates utf16 output - one extra for final surrogate pairs */
int ubuflen; /* length used in ubuf */
int ubufcols; /* how many columns are represented by the chars in ubuf? */
#endif
#endif
};
static int fd_read(struct current *current);
static int getWindowSize(struct current *current);
static void cursorDown(struct current *current, int n);
static void cursorUp(struct current *current, int n);
static void eraseEol(struct current *current);
static void refreshLine(struct current *current);
static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos);
static void setCursorPos(struct current *current, int x);
static void setOutputHighlight(struct current *current, const int *props, int nprops);
static void set_current(struct current *current, const char *str);
void linenoiseHistoryFree(void) {
if (history) {
int j;
for (j = 0; j < history_len; j++)
free(history[j]);
free(history);
history = NULL;
history_len = 0;
}
}
typedef enum {
EP_START, /* looking for ESC */
EP_ESC, /* looking for [ */
EP_DIGITS, /* parsing digits */
EP_PROPS, /* parsing digits or semicolons */
EP_END, /* ok */
EP_ERROR, /* error */
} ep_state_t;
struct esc_parser {
ep_state_t state;
int props[5]; /* properties are stored here */
int maxprops; /* size of the props[] array */
int numprops; /* number of properties found */
int termchar; /* terminator char, or 0 for any alpha */
int current; /* current (partial) property value */
};
/**
* Initialise the escape sequence parser at *parser.
*
* If termchar is 0 any alpha char terminates ok. Otherwise only the given
* char terminates successfully.
* Run the parser state machine with calls to parseEscapeSequence() for each char.
*/
static void initParseEscapeSeq(struct esc_parser *parser, int termchar)
{
parser->state = EP_START;
parser->maxprops = sizeof(parser->props) / sizeof(*parser->props);
parser->numprops = 0;
parser->current = 0;
parser->termchar = termchar;
}
/**
* Pass character 'ch' into the state machine to parse:
* 'ESC' '[' <digits> (';' <digits>)* <termchar>
*
* The first character must be ESC.
* Returns the current state. The state machine is done when it returns either EP_END
* or EP_ERROR.
*
* On EP_END, the "property/attribute" values can be read from parser->props[]
* of length parser->numprops.
*/
static int parseEscapeSequence(struct esc_parser *parser, int ch)
{
switch (parser->state) {
case EP_START:
parser->state = (ch == '\x1b') ? EP_ESC : EP_ERROR;
break;
case EP_ESC:
parser->state = (ch == '[') ? EP_DIGITS : EP_ERROR;
break;
case EP_PROPS:
if (ch == ';') {
parser->state = EP_DIGITS;
donedigits:
if (parser->numprops + 1 < parser->maxprops) {
parser->props[parser->numprops++] = parser->current;
parser->current = 0;
}
break;
}
/* fall through */
case EP_DIGITS:
if (ch >= '0' && ch <= '9') {
parser->current = parser->current * 10 + (ch - '0');
parser->state = EP_PROPS;
break;
}
/* must be terminator */
if (parser->termchar != ch) {
if (parser->termchar != 0 || !((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))) {
parser->state = EP_ERROR;
break;
}
}
parser->state = EP_END;
goto donedigits;
case EP_END:
parser->state = EP_ERROR;
break;
case EP_ERROR:
break;
}
return parser->state;
}
/*#define DEBUG_REFRESHLINE*/
#ifdef DEBUG_REFRESHLINE
#define DRL(ARGS...) fprintf(dfh, ARGS)
static FILE *dfh;
static void DRL_CHAR(int ch)
{
if (ch < ' ') {
DRL("^%c", ch + '@');
}
else if (ch > 127) {
DRL("\\u%04x", ch);
}
else {
DRL("%c", ch);
}
}
static void DRL_STR(const char *str)
{
while (*str) {
int ch;
int n = utf8_tounicode(str, &ch);
str += n;
DRL_CHAR(ch);
}
}
#else
#define DRL(...)
#define DRL_CHAR(ch)
#define DRL_STR(str)
#endif
#if defined(USE_WINCONSOLE)
#include "linenoise-win32.c"
#endif
#if defined(USE_TERMIOS)
static void linenoiseAtExit(void);
static struct termios orig_termios; /* in order to restore at exit */
static int rawmode = 0; /* for atexit() function to check if restore is needed*/
static int atexit_registered = 0; /* register atexit just 1 time */
static const char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
static int isUnsupportedTerm(void) {
char *term = getenv("TERM");
if (term) {
int j;
for (j = 0; unsupported_term[j]; j++) {
if (strcmp(term, unsupported_term[j]) == 0) {
return 1;
}
}
}
return 0;
}
static int enableRawMode(struct current *current) {
struct termios raw;
current->fd = STDIN_FILENO;
current->cols = 0;
if (!isatty(current->fd) || isUnsupportedTerm() ||
tcgetattr(current->fd, &orig_termios) == -1) {
fatal:
errno = ENOTTY;
return -1;
}
if (!atexit_registered) {
atexit(linenoiseAtExit);
atexit_registered = 1;
}
raw = orig_termios; /* modify the original mode */
/* input modes: no break, no CR to NL, no parity check, no strip char,
* no start/stop output control. */
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
/* output modes - actually, no need to disable post processing */
/*raw.c_oflag &= ~(OPOST);*/
/* control modes - set 8 bit chars */
raw.c_cflag |= (CS8);
/* local modes - choing off, canonical off, no extended functions,
* no signal chars (^Z,^C) */
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
/* control chars - set return condition: min number of bytes and timer.
* We want read to return every single byte, without timeout. */
raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
/* put terminal in raw mode after flushing */
if (tcsetattr(current->fd,TCSADRAIN,&raw) < 0) {
goto fatal;
}
rawmode = 1;
return 0;
}
static void disableRawMode(struct current *current) {
/* Don't even check the return value as it's too late. */
if (rawmode && tcsetattr(current->fd,TCSADRAIN,&orig_termios) != -1)
rawmode = 0;
}
/* At exit we'll try to fix the terminal to the initial conditions. */
static void linenoiseAtExit(void) {
if (rawmode) {
tcsetattr(STDIN_FILENO, TCSADRAIN, &orig_termios);
}
linenoiseHistoryFree();
}
/* gcc/glibc insists that we care about the return code of write!
* Clarification: This means that a void-cast like "(void) (EXPR)"
* does not work.
*/
#define IGNORE_RC(EXPR) if (EXPR) {}
/**
* Output bytes directly, or accumulate output (if current->output is set)
*/
static void outputChars(struct current *current, const char *buf, int len)
{
if (len < 0) {
len = strlen(buf);
}
if (current->output) {
sb_append_len(current->output, buf, len);
}
else {
IGNORE_RC(write(current->fd, buf, len));
}
}
/* Like outputChars, but using printf-style formatting
*/
static void outputFormatted(struct current *current, const char *format, ...)
{
va_list args;
char buf[64];
int n;
va_start(args, format);
n = vsnprintf(buf, sizeof(buf), format, args);
/* This will never happen because we are sure to use outputFormatted() only for short sequences */
assert(n < (int)sizeof(buf));
va_end(args);
outputChars(current, buf, n);
}
static void cursorToLeft(struct current *current)
{
outputChars(current, "\r", -1);
}
static void setOutputHighlight(struct current *current, const int *props, int nprops)
{
outputChars(current, "\x1b[", -1);
while (nprops--) {
outputFormatted(current, "%d%c", *props, (nprops == 0) ? 'm' : ';');
props++;
}
}
static void eraseEol(struct current *current)
{
outputChars(current, "\x1b[0K", -1);
}
static void setCursorPos(struct current *current, int x)
{
if (x == 0) {
cursorToLeft(current);
}
else {
outputFormatted(current, "\r\x1b[%dC", x);
}
}
static void cursorUp(struct current *current, int n)
{
if (n) {
outputFormatted(current, "\x1b[%dA", n);
}
}
static void cursorDown(struct current *current, int n)
{
if (n) {
outputFormatted(current, "\x1b[%dB", n);
}
}
void linenoiseClearScreen(void)
{
IGNORE_RC(write(STDOUT_FILENO, "\x1b[H\x1b[2J", 7));
}
/**
* Reads a char from 'fd', waiting at most 'timeout' milliseconds.
*
* A timeout of -1 means to wait forever.
*
* Returns -1 if no char is received within the time or an error occurs.
*/
static int fd_read_char(int fd, int timeout)
{
struct pollfd p;
unsigned char c;
p.fd = fd;
p.events = POLLIN;
if (poll(&p, 1, timeout) == 0) {
/* timeout */
return -1;
}
if (read(fd, &c, 1) != 1) {
return -1;
}
return c;
}
/**
* Reads a complete utf-8 character
* and returns the unicode value, or -1 on error.
*/
static int fd_read(struct current *current)
{
#ifdef USE_UTF8
char buf[MAX_UTF8_LEN];
int n;
int i;
int c;
if (read(current->fd, &buf[0], 1) != 1) {
return -1;
}
n = utf8_charlen(buf[0]);
if (n < 1) {
return -1;
}
for (i = 1; i < n; i++) {
if (read(current->fd, &buf[i], 1) != 1) {
return -1;
}
}
/* decode and return the character */
utf8_tounicode(buf, &c);
return c;
#else
return fd_read_char(current->fd, -1);
#endif
}
/**
* Stores the current cursor column in '*cols'.
* Returns 1 if OK, or 0 if failed to determine cursor pos.
*/
static int queryCursor(struct current *current, int* cols)
{
struct esc_parser parser;
int ch;
/* Should not be buffering this output, it needs to go immediately */
assert(current->output == NULL);
/* control sequence - report cursor location */
outputChars(current, "\x1b[6n", -1);
/* Parse the response: ESC [ rows ; cols R */
initParseEscapeSeq(&parser, 'R');
while ((ch = fd_read_char(current->fd, 100)) > 0) {
switch (parseEscapeSequence(&parser, ch)) {
default:
continue;
case EP_END:
if (parser.numprops == 2 && parser.props[1] < 1000) {
*cols = parser.props[1];
return 1;
}
break;
case EP_ERROR:
break;
}
/* failed */
break;
}
return 0;
}
/**
* Updates current->cols with the current window size (width)
*/
static int getWindowSize(struct current *current)
{
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col != 0) {
current->cols = ws.ws_col;
return 0;
}
/* Failed to query the window size. Perhaps we are on a serial terminal.
* Try to query the width by sending the cursor as far to the right
* and reading back the cursor position.
* Note that this is only done once per call to linenoise rather than
* every time the line is refreshed for efficiency reasons.
*
* In more detail, we:
* (a) request current cursor position,
* (b) move cursor far right,
* (c) request cursor position again,
* (d) at last move back to the old position.
* This gives us the width without messing with the externally
* visible cursor position.
*/
if (current->cols == 0) {
int here;
/* If anything fails => default 80 */
current->cols = 80;
/* (a) */
if (queryCursor (current, &here)) {
/* (b) */
setCursorPos(current, 999);
/* (c). Note: If (a) succeeded, then (c) should as well.
* For paranoia we still check and have a fallback action
* for (d) in case of failure..
*/
if (queryCursor (current, ¤t->cols)) {
/* (d) Reset the cursor back to the original location. */
if (current->cols > here) {
setCursorPos(current, here);
}
}
}
}
return 0;
}
/**
* If CHAR_ESCAPE was received, reads subsequent
* chars to determine if this is a known special key.
*
* Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
*
* If no additional char is received within a short time,
* CHAR_ESCAPE is returned.
*/
static int check_special(int fd)
{
int c = fd_read_char(fd, 50);
int c2;
if (c < 0) {
return CHAR_ESCAPE;
}
else if (c >= 'a' && c <= 'z') {
/* esc-a => meta-a */