-
Notifications
You must be signed in to change notification settings - Fork 0
/
editor.cc
1714 lines (1537 loc) · 55.4 KB
/
editor.cc
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
/* Ette (Encrypted Terminal Text Editor)
*
* The MIT License (MIT)
*
* Copyright (c) 2023 Ryan McDermott
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE
*
* Based on Kilo by antirez
* -----------------------------------------------------------------------
* A very simple editor in less than 1-kilo lines of code (as counted
* by "cloc"). Does not depend on libcurses, directly emits VT100
* escapes on the terminal.
*
* -----------------------------------------------------------------------
*
* Copyright (C) 2016 Salvatore Sanfilippo <antirez at gmail dot com>
*
* 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.
*/
#ifdef __linux__
#define _POSIX_C_SOURCE 200809L
#endif
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <optional>
#include <sstream>
#include "crypto.h"
#include "editor.h"
#include "status.h"
using ::ette::CryptoAlgorithm;
using ::ette::CryptoState;
using ::ette::Decrypt;
using ::ette::Encrypt;
using ::ette::GenerateRandomAsciiByteVector;
using ::ette::IsKeyCorrect;
// Syntax highlight types
constexpr int32_t HL_NORMAL = 0;
constexpr int32_t HL_NONPRINT = 1;
constexpr int32_t HL_COMMENT = 2; // Single line comment.
constexpr int32_t HL_MLCOMMENT = 3; // Multi-line comment.
constexpr int32_t HL_KEYWORD1 = 4;
constexpr int32_t HL_KEYWORD2 = 5;
constexpr int32_t HL_STRING = 6;
constexpr int32_t HL_NUMBER = 7;
constexpr int32_t HL_MATCH = 8; /* Search match. */
constexpr int32_t HL_HIGHLIGHT_STRINGS = 1 << 0;
constexpr int32_t HL_HIGHLIGHT_NUMBERS = 1 << 1;
constexpr int32_t QUERY_LEN = 256;
#define ABUF_INIT \
{ NULL, 0 }
static struct State* E;
static struct termios orig_termios; // In order to restore at exit.
// PURE
/* Set an editor status message for the second line of the status, at the
* end of the screen. */
void SetStatusMessage(State* state, const char* fmt, ...) {
va_list ap;
va_start(ap, fmt);
vsnprintf(state->statusmsg, sizeof(state->statusmsg), fmt, ap);
va_end(ap);
state->statusmsg_time = time(NULL);
}
/* =========================== Syntax highlights DB =========================
*
* In order to add a new syntax, define two arrays with a list of file name
* matches and keywords. The file name matches are used in order to match
* a given syntax with a given file name: if a match pattern starts with a
* dot, it is matched as the last past of the filename, for example ".c".
* Otherwise the pattern is just searched inside the filenme, like "Makefile").
*
* The list of keywords to highlight is just a list of words, however if they
* a trailing '|' character is added at the end, they are highlighted in
* a different color, so that you can have two different sets of keywords.
*
* Finally add a stanza in the HLDB global variable with two two arrays
* of strings, and a set of flags in order to enable highlighting of
* comments and numbers.
*
* The characters for single and multi line comments must be exactly two
* and must be provided as well (see the C language example).
*
* There is no support to highlight patterns currently. */
/* C / C++ */
const char* C_HL_extensions[] = {".c", ".h", ".cpp", ".hpp", ".cc", NULL};
const char* C_HL_keywords[] = {
/* C Keywords */
"auto", "break", "case", "continue", "default", "do", "else", "enum",
"extern", "for", "goto", "if", "register", "return", "sizeof", "static",
"struct", "switch", "typedef", "union", "volatile", "while", "NULL",
/* C++ Keywords */
"alignas", "alignof", "and", "and_eq", "asm", "bitand", "bitor", "class",
"compl", "constexpr", "const_cast", "deltype", "delete", "dynamic_cast",
"explicit", "export", "false", "friend", "inline", "mutable", "namespace",
"new", "noexcept", "not", "not_eq", "nullptr", "operator", "or", "or_eq",
"private", "protected", "public", "reinterpret_cast", "static_assert",
"static_cast", "template", "this", "thread_local", "throw", "true", "try",
"typeid", "typename", "virtual", "xor", "xor_eq",
/* C types */
"int|", "long|", "double|", "float|", "char|", "unsigned|", "signed|",
"void|", "short|", "auto|", "const|", "bool|", NULL};
/* Here we define an array of syntax highlights by extensions, keywords,
* comments delimiters and flags. */
struct Syntax HLDB[] = {{/* C / C++ */
(char**)C_HL_extensions, (char**)C_HL_keywords, "//",
"/*", "*/",
HL_HIGHLIGHT_STRINGS | HL_HIGHLIGHT_NUMBERS}};
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
/* ======================= Low level terminal handling ====================== */
// SIDE EFFECTS
void DisableRawMode(int fd) {
/* Don't even check the return value as it's too late. */
if (E->rawmode) {
tcsetattr(fd, TCSAFLUSH, &orig_termios);
E->rawmode = 0;
}
}
// SIDE EFFECTS
/* Called at exit to avoid remaining in raw mode. */
void OnExit() {
DisableRawMode(STDIN_FILENO);
}
// SIDE EFFECTS
/* Raw mode: 1960s style. */
int EnableRawMode(int fd) {
struct termios raw;
if (E->rawmode)
return 0; /* Already enabled. */
if (!isatty(STDIN_FILENO))
goto fatal;
atexit(OnExit);
if (tcgetattr(fd, &orig_termios) == -1)
goto fatal;
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 - 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. */
raw.c_cc[VMIN] = 0; /* Return each byte, or zero for timeout. */
raw.c_cc[VTIME] = 1; /* 100 ms timeout (unit is tens of second). */
/* put terminal in raw mode after flushing */
if (tcsetattr(fd, TCSAFLUSH, &raw) < 0)
goto fatal;
E->rawmode = 1;
return 0;
fatal:
errno = ENOTTY;
return -1;
}
// SIDE EFFECTS
/* Read a key from the terminal put in raw mode, trying to handle
* escape sequences. */
int ReadKey(int fd) {
int nread;
char c, seq[3];
while ((nread = read(fd, &c, 1)) == 0)
;
if (nread == -1)
exit(1);
while (1) {
switch (c) {
case ESC: /* escape sequence */
/* If this is just an ESC, we'll timeout here. */
if (read(fd, seq, 1) == 0)
return ESC;
if (read(fd, seq + 1, 1) == 0)
return ESC;
/* ESC [ sequences. */
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
/* Extended escape, read additional byte. */
if (read(fd, seq + 2, 1) == 0)
return ESC;
if (seq[2] == '~') {
switch (seq[1]) {
case '3':
return DEL_KEY;
case '5':
return PAGE_UP;
case '6':
return PAGE_DOWN;
}
}
} else {
switch (seq[1]) {
case 'A':
return ARROW_UP;
case 'B':
return ARROW_DOWN;
case 'C':
return ARROW_RIGHT;
case 'D':
return ARROW_LEFT;
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
}
/* ESC O sequences. */
else if (seq[0] == 'O') {
switch (seq[1]) {
case 'H':
return HOME_KEY;
case 'F':
return END_KEY;
}
}
break;
default:
return c;
}
}
}
// SIDE EFFECTS
/* Use the ESC [6n escape sequence to query the horizontal cursor position
* and return it. On error -1 is returned, on success the position of the
* cursor is stored at *rows and *cols and 0 is returned. */
int GetCursorPos(int ifd, int ofd, int* rows, int* cols) {
char buf[32];
unsigned int i = 0;
/* Report cursor location */
if (write(ofd, "\x1b[6n", 4) != 4)
return -1;
/* Read the response: ESC [ rows ; cols R */
while (i < sizeof(buf) - 1) {
if (read(ifd, buf + i, 1) != 1)
break;
if (buf[i] == 'R')
break;
i++;
}
buf[i] = '\0';
/* Parse it. */
if (buf[0] != ESC || buf[1] != '[')
return -1;
if (sscanf(buf + 2, "%d;%d", rows, cols) != 2)
return -1;
return 0;
}
// SIDE EFFECTS
/* Try to get the number of columns in the current terminal. If the ioctl()
* call fails the function will try to query the terminal itself.
* Returns 0 on success, -1 on error. */
int GetWindowSize(int ifd, int ofd, int* rows, int* cols) {
struct winsize ws;
if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
/* ioctl() failed. Try to query the terminal itself. */
int orig_row, orig_col, retval;
/* Get the initial position so we can restore it later. */
retval = GetCursorPos(ifd, ofd, &orig_row, &orig_col);
if (retval == -1)
goto failed;
/* Go to right/bottom margin and get position. */
if (write(ofd, "\x1b[999C\x1b[999B", 12) != 12)
goto failed;
retval = GetCursorPos(ifd, ofd, rows, cols);
if (retval == -1)
goto failed;
/* Restore position. */
char seq[32];
snprintf(seq, 32, "\x1b[%d;%dH", orig_row, orig_col);
if (write(ofd, seq, strlen(seq)) == -1) {
/* Can't recover... */
}
return 0;
} else {
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
failed:
return -1;
}
/* ====================== Syntax highlight color scheme ==================== */
// PURE
int IsSeparator(int c) {
return c == '\0' || isspace(c) || strchr(",.()+-/*=~%[];", c) != NULL;
}
// PURE
/* Return true if the specified row last char is part of a multi line comment
* that starts at this row or at one before, and does not end at the end
* of the row but spawns to the next row. */
int RowHasOpenComment(Row* row) {
if (row->hl && row->rsize && row->hl[row->rsize - 1] == HL_MLCOMMENT &&
(row->rsize < 2 || (row->render[row->rsize - 2] != '*' ||
row->render[row->rsize - 1] != '/')))
return 1;
return 0;
}
// PURE
/* Set every byte of row->hl (that corresponds to every character in the line)
* to the right syntax highlight type (HL_* defines). */
void UpdateSyntax(State* state, Row* row) {
row->hl = (unsigned char*)realloc(row->hl, row->rsize);
memset(row->hl, HL_NORMAL, row->rsize);
if (state->syntax == NULL)
return; /* No syntax, everything is HL_NORMAL. */
int i, prev_sep, in_string, in_comment;
char* p;
char** keywords = state->syntax->keywords;
char* scs = state->syntax->singleline_comment_start;
char* mcs = state->syntax->multiline_comment_start;
char* mce = state->syntax->multiline_comment_end;
/* Point to the first non-space char. */
p = row->render;
i = 0; /* Current char offset */
while (*p && isspace(*p)) {
p++;
i++;
}
prev_sep = 1; /* Tell the parser if 'i' points to start of word. */
in_string = 0; /* Are we inside "" or '' ? */
in_comment = 0; /* Are we inside multi-line comment? */
/* If the previous line has an open comment, this line starts
* with an open comment state. */
if (row->idx > 0 && RowHasOpenComment(&state->row[row->idx - 1]))
in_comment = 1;
while (*p) {
/* Handle // comments. */
if (prev_sep && *p == scs[0] && *(p + 1) == scs[1]) {
/* From here to end is a comment */
memset(row->hl + i, HL_COMMENT, row->size - i);
return;
}
/* Handle multi line comments. */
if (in_comment) {
row->hl[i] = HL_MLCOMMENT;
if (*p == mce[0] && *(p + 1) == mce[1]) {
row->hl[i + 1] = HL_MLCOMMENT;
p += 2;
i += 2;
in_comment = 0;
prev_sep = 1;
continue;
} else {
prev_sep = 0;
p++;
i++;
continue;
}
} else if (*p == mcs[0] && *(p + 1) == mcs[1]) {
row->hl[i] = HL_MLCOMMENT;
row->hl[i + 1] = HL_MLCOMMENT;
p += 2;
i += 2;
in_comment = 1;
prev_sep = 0;
continue;
}
/* Handle "" and '' */
if (in_string) {
row->hl[i] = HL_STRING;
if (*p == '\\') {
row->hl[i + 1] = HL_STRING;
p += 2;
i += 2;
prev_sep = 0;
continue;
}
if (*p == in_string)
in_string = 0;
p++;
i++;
continue;
} else {
if (*p == '"' || *p == '\'') {
in_string = *p;
row->hl[i] = HL_STRING;
p++;
i++;
prev_sep = 0;
continue;
}
}
/* Handle non printable chars. */
if (!isprint(*p)) {
row->hl[i] = HL_NONPRINT;
p++;
i++;
prev_sep = 0;
continue;
}
/* Handle numbers */
if ((isdigit(*p) && (prev_sep || row->hl[i - 1] == HL_NUMBER)) ||
(*p == '.' && i > 0 && row->hl[i - 1] == HL_NUMBER)) {
row->hl[i] = HL_NUMBER;
p++;
i++;
prev_sep = 0;
continue;
}
/* Handle keywords and lib calls */
if (prev_sep) {
int j;
for (j = 0; keywords[j]; j++) {
int klen = strlen(keywords[j]);
int kw2 = keywords[j][klen - 1] == '|';
if (kw2)
klen--;
if (!memcmp(p, keywords[j], klen) && IsSeparator(*(p + klen))) {
/* Keyword */
memset(row->hl + i, kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
p += klen;
i += klen;
break;
}
}
if (keywords[j] != NULL) {
prev_sep = 0;
continue; /* We had a keyword match */
}
}
/* Not special chars */
prev_sep = IsSeparator(*p);
p++;
i++;
}
/* Propagate syntax change to the next row if the open commen
* state changed. This may recursively affect all the following rows
* in the file. */
int oc = RowHasOpenComment(row);
if (row->hl_oc != oc && row->idx + 1 < state->numrows)
UpdateSyntax(state, &state->row[row->idx + 1]);
row->hl_oc = oc;
}
// PURE
/* Maps syntax highlight token types to terminal colors. */
int SyntaxToColor(int hl) {
switch (hl) {
case HL_COMMENT:
case HL_MLCOMMENT:
return 36; /* cyan */
case HL_KEYWORD1:
return 33; /* yellow */
case HL_KEYWORD2:
return 32; /* green */
case HL_STRING:
return 35; /* magenta */
case HL_NUMBER:
return 31; /* red */
case HL_MATCH:
return 34; /* blu */
default:
return 37; /* white */
}
}
// PURE
/* Select the syntax highlight scheme depending on the filename,
* setting it in the global state state->syntax. */
void SelectSyntaxHighlight(State* state, char* filename) {
for (unsigned int j = 0; j < HLDB_ENTRIES; j++) {
struct Syntax* s = HLDB + j;
unsigned int i = 0;
while (s->filematch[i]) {
char* p;
int patlen = strlen(s->filematch[i]);
if ((p = strstr(filename, s->filematch[i])) != NULL) {
if (s->filematch[i][0] != '.' || p[patlen] == '\0') {
state->syntax = s;
return;
}
}
i++;
}
}
}
/* ======================= Editor rows implementation ======================= */
// Somewhat PURE but also SIDE EFFECTS -- Can remove the printf though and just return the error code.
/* Update the rendered version and the syntax highlight of a row. */
void UpdateRow(State* state, Row* row) {
unsigned int tabs = 0, nonprint = 0;
int j, idx;
/* Create a version of the row we can directly print on the screen,
* respecting tabs, substituting non printable characters with '?'. */
free(row->render);
for (j = 0; j < row->size; j++)
if (row->chars[j] == TAB)
tabs++;
unsigned long long allocsize =
(unsigned long long)row->size + tabs * 8 + nonprint * 9 + 1;
if (allocsize > UINT32_MAX) {
printf("Some line of the edited file is too long for ette\n");
exit(1);
}
row->render = (char*)malloc(row->size + tabs * 8 + nonprint * 9 + 1);
idx = 0;
for (j = 0; j < row->size; j++) {
if (row->chars[j] == TAB) {
row->render[idx++] = ' ';
while ((idx + 1) % 8 != 0)
row->render[idx++] = ' ';
} else {
row->render[idx++] = row->chars[j];
}
}
row->rsize = idx;
row->render[idx] = '\0';
/* Update the syntax highlighting attributes of the row. */
UpdateSyntax(state, row);
}
// PURE -- minor exception that it prints and exits
/* Insert a row at the specified position, shifting the other rows on the bottom
* if required. */
void InsertRow(State* state, int at, const char* s, size_t len) {
if (at > state->numrows)
return;
state->row = (Row*)realloc(state->row, sizeof(Row) * (state->numrows + 1));
if (at != state->numrows) {
memmove(state->row + at + 1, state->row + at,
sizeof(state->row[0]) * (state->numrows - at));
for (int j = at + 1; j <= state->numrows; j++)
state->row[j].idx++;
}
state->row[at].size = len;
state->row[at].chars = (char*)malloc(len + 1);
memcpy(state->row[at].chars, s, len + 1);
state->row[at].hl = NULL;
state->row[at].hl_oc = 0;
state->row[at].render = NULL;
state->row[at].rsize = 0;
state->row[at].idx = at;
UpdateRow(state, state->row + at);
state->numrows++;
state->dirty++;
}
// PURE
/* Free row's heap allocated stuff. */
void FreeRow(Row* row) {
free(row->render);
free(row->chars);
free(row->hl);
}
// PURE
/* Remove the row at the specified position, shifting the remaining on the
* top. */
void DeleteRow(State* state, int at) {
Row* row;
if (at >= state->numrows)
return;
row = state->row + at;
FreeRow(row);
memmove(state->row + at, state->row + at + 1,
sizeof(state->row[0]) * (state->numrows - at - 1));
for (int j = at; j < state->numrows - 1; j++)
state->row[j].idx++;
state->numrows--;
state->dirty++;
}
// PURE
/* Turn the editor rows into a single heap-allocated string.
* Returns the pointer to the heap-allocated string and populate the
* integer pointed by 'buflen' with the size of the string, escluding
* the final nulterm. */
char* RowsToString(State* state, int* buflen) {
char *buf = NULL, *p;
int totlen = 0;
int j;
/* Compute count of bytes */
for (j = 0; j < state->numrows; j++)
totlen +=
state->row[j].size + 1; /* +1 is for "\n" at end of every row */
*buflen = totlen;
totlen++; /* Also make space for nulterm */
p = buf = (char*)malloc(totlen);
for (j = 0; j < state->numrows; j++) {
memcpy(p, state->row[j].chars, state->row[j].size);
p += state->row[j].size;
*p = '\n';
p++;
}
*p = '\0';
return buf;
}
// PURE -- minor exception that it can print and exit
/* Insert a character at the specified position in a row, moving the remaining
* chars on the right if needed. */
void RowInsertChar(State* state, Row* row, int at, int c) {
if (at > row->size) {
/* Pad the string with spaces if the insert location is outside the
* current length by more than a single character. */
int padlen = at - row->size;
/* In the next line +2 means: new char and null term. */
row->chars = (char*)realloc(row->chars, row->size + padlen + 2);
memset(row->chars + row->size, ' ', padlen);
row->chars[row->size + padlen + 1] = '\0';
row->size += padlen + 1;
} else {
/* If we are in the middle of the string just make space for 1 new
* char plus the (already existing) null term. */
row->chars = (char*)realloc(row->chars, row->size + 2);
memmove(row->chars + at + 1, row->chars + at, row->size - at + 1);
row->size++;
}
row->chars[at] = c;
UpdateRow(state, row);
state->dirty++;
}
// PURE -- minor exception that it can print and exit
/* Append the string 's' at the end of a row */
void RowAppendString(State* state, Row* row, char* s, size_t len) {
row->chars = (char*)realloc(row->chars, row->size + len + 1);
memcpy(row->chars + row->size, s, len);
row->size += len;
row->chars[row->size] = '\0';
UpdateRow(state, row);
state->dirty++;
}
// PURE -- minor exception that it can print and exit
/* Delete the character at offset 'at' from the specified row. */
void RowDeleteChar(State* state, Row* row, int at) {
if (row->size <= at)
return;
memmove(row->chars + at, row->chars + at + 1, row->size - at);
UpdateRow(state, row);
row->size--;
state->dirty++;
}
// PURE -- minor exception that it can print and exit
/* Insert the specified char at the current prompt position. */
void InsertChar(State* state, int c) {
int filerow = state->rowoff + state->cy;
int filecol = state->coloff + state->cx;
Row* row = (filerow >= state->numrows) ? NULL : &state->row[filerow];
/* If the row where the cursor is currently located does not exist in our
* logical representaion of the file, add enough empty rows as needed. */
if (!row) {
while (state->numrows <= filerow)
InsertRow(state, state->numrows, "", 0);
}
row = &state->row[filerow];
if (state->existing_file_password_state ==
ExistingFilePasswordState::kTyping ||
state->new_file_password_state ==
NewFilePasswordState::kTypingEnterPassword ||
state->new_file_password_state ==
NewFilePasswordState::kTypingConfirmPassword) {
state->entry_password += (char)c;
RowInsertChar(state, row, filecol, '*');
} else {
RowInsertChar(state, row, filecol, c);
}
if (state->cx == state->screencols - 1)
state->coloff++;
else
state->cx++;
state->dirty++;
}
// PURE -- minor exception that it can print and exit
/* Inserting a newline is slightly complex as we have to handle inserting a
* newline in the middle of a line, splitting the line as needed. */
void InsertNewLine(State* state) {
int filerow = state->rowoff + state->cy;
int filecol = state->coloff + state->cx;
Row* row = (filerow >= state->numrows) ? NULL : &state->row[filerow];
if (!row) {
if (filerow == state->numrows) {
InsertRow(state, filerow, "", 0);
goto fixcursor;
}
return;
}
/* If the cursor is over the current line size, we want to conceptually
* think it's just over the last character. */
if (filecol >= row->size)
filecol = row->size;
if (filecol == 0) {
InsertRow(state, filerow, "", 0);
} else {
/* We are in the middle of a line. Split it between two rows. */
InsertRow(state, filerow + 1, row->chars + filecol,
row->size - filecol);
row = &state->row[filerow];
row->chars[filecol] = '\0';
row->size = filecol;
UpdateRow(state, row);
}
fixcursor:
if (state->cy == state->screenrows - 1) {
state->rowoff++;
} else {
state->cy++;
}
state->cx = 0;
state->coloff = 0;
}
// PURE -- minor exception that it can print and exit
/* Delete the char at the current prompt position. */
void DeleteChar(State* state) {
int filerow = state->rowoff + state->cy;
int filecol = state->coloff + state->cx;
Row* row = (filerow >= state->numrows) ? NULL : &state->row[filerow];
if (!row || (filecol == 0 && filerow == 0))
return;
if (filecol == 0) {
/* Handle the case of column 0, we need to move the current line
* on the right of the previous one. */
filecol = state->row[filerow - 1].size;
RowAppendString(state, &state->row[filerow - 1], row->chars, row->size);
DeleteRow(state, filerow);
row = NULL;
if (state->cy == 0)
state->rowoff--;
else
state->cy--;
state->cx = filecol;
if (state->cx >= state->screencols) {
int shift = (state->screencols - state->cx) + 1;
state->cx -= shift;
state->coloff += shift;
}
} else {
if (state->existing_file_password_state ==
ExistingFilePasswordState::kTyping ||
state->new_file_password_state ==
NewFilePasswordState::kTypingEnterPassword ||
state->new_file_password_state ==
NewFilePasswordState::kTypingConfirmPassword) {
state->entry_password.pop_back();
}
RowDeleteChar(state, row, filecol - 1);
if (state->cx == 0 && state->coloff)
state->coloff--;
else
state->cx--;
}
if (row)
UpdateRow(state, row);
state->dirty++;
}
std::optional<std::string> ReadFileToString(const std::string& path) {
std::ifstream file(path);
if (!file.is_open()) {
return std::nullopt;
}
std::string content((std::istreambuf_iterator<char>(file)),
std::istreambuf_iterator<char>());
return content;
}
int OpenEncryptedFile(State* state, char* filename) {
std::optional<std::string> content = ReadFileToString(filename);
if (!content) {
return 1;
}
const CryptoState crypto_state =
Decrypt(*content, state->password, state->crypto_algorithm);
if (!crypto_state.status.ok()) {
return 1;
}
const std::string plaintext = crypto_state.plaintext;
std::string line;
std::istringstream iss(plaintext);
while (std::getline(iss, line)) {
InsertRow(state, state->numrows, line.c_str(), line.length());
}
state->dirty = 0;
return 0;
}
// SIDE EFFECTS
/* Load the specified program in the editor memory and returns 0 on success
* or 1 on error. */
int Open(State* state, char* filename) {
FILE* fp;
state->dirty = 0;
free(state->filename);
size_t fnlen = strlen(filename) + 1;
state->filename = (char*)malloc(fnlen);
memcpy(state->filename, filename, fnlen);
if (!state->password.empty()) {
return OpenEncryptedFile(state, filename);
}
fp = fopen(filename, "r");
if (!fp) {
if (errno != ENOENT) {
perror("Opening file");
exit(1);
}
return 1;
}
char* line = NULL;
size_t linecap = 0;
ssize_t linelen;
while ((linelen = getline(&line, &linecap, fp)) != -1) {
if (linelen && (line[linelen - 1] == '\n' || line[linelen - 1] == '\r'))
line[--linelen] = '\0';
InsertRow(state, state->numrows, line, linelen);
}
free(line);
fclose(fp);
state->dirty = 0;
return 0;
}
// SIDE EFFECTS
/* Save the current file on disk. Return 0 on success, 1 on error. */
int Save(State* state) {
int len;
char* buf = RowsToString(state, &len);
const std::string plaintext = std::string(buf, len);
std::string buffer_str = plaintext;
free(buf);
int fd = open(state->filename, O_RDWR | O_CREAT, 0644);
if (fd == -1) {
if (fd != -1)
close(fd);
SetStatusMessage(state, "Can't save! I/O error: %s", strerror(errno));
return 1;
}
if (state->password.length() > 0) {
const CryptoState encrypted_state =
Encrypt(plaintext, state->password, GenerateRandomAsciiByteVector(),
state->crypto_algorithm);
if (encrypted_state.status.ok()) {
buffer_str = encrypted_state.ciphertext;
len = buffer_str.length();
} else {
SetStatusMessage(state, "ERROR! Failed to encrypt");
return 1;
}
}
/* Use truncate + a single write(2) call in order to make saving
* a bit safer, under the limits of what we can do in a small editor. */
if (ftruncate(fd, len) == -1) {
if (fd != -1)
close(fd);
SetStatusMessage(state, "Can't save! I/O error: %s", strerror(errno));
return 1;
}
if (write(fd, buffer_str.c_str(), len) != len) {
if (fd != -1)
close(fd);
SetStatusMessage(state, "Can't save! I/O error: %s", strerror(errno));
return 1;