forked from gwsw/less
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathline.c
1605 lines (1478 loc) · 37 KB
/
line.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) 1984-2023 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.
*/
/*
* Routines to manipulate the "line buffer".
* The line buffer holds a line of output as it is being built
* in preparation for output to the screen.
*/
#include "less.h"
#include "charset.h"
#include "position.h"
#if MSDOS_COMPILER==WIN32C
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
#define MAX_PFX_WIDTH (MAX_LINENUM_WIDTH + MAX_STATUSCOL_WIDTH + 1)
static struct {
char *buf; /* Buffer which holds the current output line */
int *attr; /* Parallel to buf, to hold attributes */
size_t print; /* Index in buf of first printable char */
size_t end; /* Number of chars in buf */
char pfx[MAX_PFX_WIDTH]; /* Holds status column and line number */
int pfx_attr[MAX_PFX_WIDTH];
size_t pfx_end; /* Number of chars in pfx */
} linebuf;
/*
* Buffer of ansi sequences which have been shifted off the left edge
* of the screen.
*/
static struct xbuffer shifted_ansi;
/*
* Ring buffer of last ansi sequences sent.
* While sending a line, these will be resent at the end
* of any highlighted string, to restore text modes.
* {{ Not ideal, since we don't really know how many to resend. }}
*/
#define NUM_LAST_ANSIS 3
static struct xbuffer last_ansi;
static struct xbuffer last_ansis[NUM_LAST_ANSIS];
static int curr_last_ansi;
public size_t size_linebuf = 0; /* Size of line buffer (and attr buffer) */
static struct ansi_state *line_ansi = NULL;
static int ansi_in_line;
static int hlink_in_line;
static int line_mark_attr;
static int cshift; /* Current left-shift of output line buffer */
public int hshift; /* Desired left-shift of output line buffer */
public int tabstops[TABSTOP_MAX] = { 0 }; /* Custom tabstops */
public int ntabstops = 1; /* Number of tabstops */
public int tabdefault = 8; /* Default repeated tabstops */
public POSITION highest_hilite; /* Pos of last hilite in file found so far */
static POSITION line_pos;
static int end_column; /* Printable length, accounting for backspaces, etc. */
static int right_curr;
static int right_column;
static int overstrike; /* Next char should overstrike previous char */
static int last_overstrike = AT_NORMAL;
static int is_null_line; /* There is no current line */
static LWCHAR pendc;
static POSITION pendpos;
static constant char *end_ansi_chars;
static constant char *mid_ansi_chars;
static int in_hilite;
static int attr_swidth(int a);
static int attr_ewidth(int a);
static int do_append(LWCHAR ch, constant char *rep, POSITION pos);
extern int sigs;
extern int bs_mode;
extern int proc_backspace;
extern int proc_tab;
extern int proc_return;
extern int linenums;
extern int ctldisp;
extern int twiddle;
extern int status_col;
extern int status_col_width;
extern int linenum_width;
extern int auto_wrap, ignaw;
extern int bo_s_width, bo_e_width;
extern int ul_s_width, ul_e_width;
extern int bl_s_width, bl_e_width;
extern int so_s_width, so_e_width;
extern int sc_width, sc_height;
extern int utf_mode;
extern POSITION start_attnpos;
extern POSITION end_attnpos;
extern char rscroll_char;
extern int rscroll_attr;
extern int use_color;
extern int status_line;
static char mbc_buf[MAX_UTF_CHAR_LEN];
static int mbc_buf_len = 0;
static int mbc_buf_index = 0;
static POSITION mbc_pos;
static size_t saved_line_end;
static int saved_end_column;
/* Configurable color map */
struct color_map { int attr; char color[12]; };
static struct color_map color_map[] = {
{ AT_UNDERLINE, "" },
{ AT_BOLD, "" },
{ AT_BLINK, "" },
{ AT_STANDOUT, "" },
{ AT_COLOR_ATTN, "Wm" },
{ AT_COLOR_BIN, "kR" },
{ AT_COLOR_CTRL, "kR" },
{ AT_COLOR_ERROR, "kY" },
{ AT_COLOR_LINENUM, "c" },
{ AT_COLOR_MARK, "Wb" },
{ AT_COLOR_PROMPT, "kC" },
{ AT_COLOR_RSCROLL, "kc" },
{ AT_COLOR_HEADER, "" },
{ AT_COLOR_SEARCH, "kG" },
{ AT_COLOR_SUBSEARCH(1), "ky" },
{ AT_COLOR_SUBSEARCH(2), "wb" },
{ AT_COLOR_SUBSEARCH(3), "YM" },
{ AT_COLOR_SUBSEARCH(4), "Yr" },
{ AT_COLOR_SUBSEARCH(5), "Wc" },
};
/* State while processing an ANSI escape sequence */
struct ansi_state {
int hindex; /* Index into hyperlink prefix */
int hlink; /* Processing hyperlink address? */
int prev_esc; /* Prev char was ESC (to detect ESC-\ seq) */
};
/*
* Initialize from environment variables.
*/
public void init_line(void)
{
int ax;
end_ansi_chars = lgetenv("LESSANSIENDCHARS");
if (isnullenv(end_ansi_chars))
end_ansi_chars = "m";
mid_ansi_chars = lgetenv("LESSANSIMIDCHARS");
if (isnullenv(mid_ansi_chars))
mid_ansi_chars = "0123456789:;[?!\"'#%()*+ ";
linebuf.buf = (char *) ecalloc(LINEBUF_SIZE, sizeof(char));
linebuf.attr = (int *) ecalloc(LINEBUF_SIZE, sizeof(int));
size_linebuf = LINEBUF_SIZE;
xbuf_init(&shifted_ansi);
xbuf_init(&last_ansi);
for (ax = 0; ax < NUM_LAST_ANSIS; ax++)
xbuf_init(&last_ansis[ax]);
curr_last_ansi = 0;
}
/*
* Expand the line buffer.
*/
static int expand_linebuf(void)
{
/* Double the size of the line buffer. */
size_t new_size = size_linebuf * 2;
char *new_buf = (char *) calloc(new_size, sizeof(char));
int *new_attr = (int *) calloc(new_size, sizeof(int));
if (new_buf == NULL || new_attr == NULL)
{
if (new_attr != NULL)
free(new_attr);
if (new_buf != NULL)
free(new_buf);
return 1;
}
/*
* We just calloc'd the buffers; copy the old contents.
*/
memcpy(new_buf, linebuf.buf, size_linebuf * sizeof(char));
memcpy(new_attr, linebuf.attr, size_linebuf * sizeof(int));
free(linebuf.attr);
free(linebuf.buf);
linebuf.buf = new_buf;
linebuf.attr = new_attr;
size_linebuf = new_size;
return 0;
}
/*
* Is a character ASCII?
*/
public lbool is_ascii_char(LWCHAR ch)
{
return (ch <= 0x7F);
}
/*
*/
static void inc_end_column(int w)
{
if (end_column > right_column && w > 0)
{
right_column = end_column;
right_curr = (int) linebuf.end;
}
end_column += w;
}
public POSITION line_position(void)
{
return line_pos;
}
/*
* Rewind the line buffer.
*/
public void prewind(void)
{
int ax;
linebuf.print = 6; /* big enough for longest UTF-8 sequence */
linebuf.pfx_end = 0;
for (linebuf.end = 0; linebuf.end < linebuf.print; linebuf.end++)
{
linebuf.buf[linebuf.end] = '\0';
linebuf.attr[linebuf.end] = 0;
}
end_column = 0;
right_curr = 0;
right_column = 0;
cshift = 0;
overstrike = 0;
last_overstrike = AT_NORMAL;
mbc_buf_len = 0;
is_null_line = 0;
pendc = '\0';
in_hilite = 0;
ansi_in_line = 0;
hlink_in_line = 0;
line_mark_attr = 0;
line_pos = NULL_POSITION;
xbuf_reset(&shifted_ansi);
xbuf_reset(&last_ansi);
for (ax = 0; ax < NUM_LAST_ANSIS; ax++)
xbuf_reset(&last_ansis[ax]);
curr_last_ansi = 0;
}
/*
* Set a character in the line buffer.
*/
static void set_linebuf(size_t n, char ch, int attr)
{
if (n >= size_linebuf)
{
/*
* Won't fit in line buffer.
* Try to expand it.
*/
if (expand_linebuf())
return;
}
linebuf.buf[n] = ch;
linebuf.attr[n] = attr;
}
/*
* Append a character to the line buffer.
*/
static void add_linebuf(char ch, int attr, int w)
{
set_linebuf(linebuf.end++, ch, attr);
inc_end_column(w);
}
/*
* Append a string to the line buffer.
*/
static void addstr_linebuf(constant char *s, int attr, int cw)
{
for ( ; *s != '\0'; s++)
add_linebuf(*s, attr, cw);
}
/*
* Set a character in the line prefix buffer.
*/
static void set_pfx(size_t n, char ch, int attr)
{
linebuf.pfx[n] = ch;
linebuf.pfx_attr[n] = attr;
}
/*
* Append a character to the line prefix buffer.
*/
static void add_pfx(char ch, int attr)
{
set_pfx(linebuf.pfx_end++, ch, attr);
}
/*
* Insert the status column and line number into the line buffer.
*/
public void plinestart(POSITION pos)
{
LINENUM linenum = 0;
if (linenums == OPT_ONPLUS)
{
/*
* Get the line number and put it in the current line.
* {{ Note: since find_linenum calls forw_raw_line,
* it may seek in the input file, requiring the caller
* of plinestart to re-seek if necessary. }}
* {{ Since forw_raw_line modifies linebuf, we must
* do this first, before storing anything in linebuf. }}
*/
linenum = find_linenum(pos);
}
/*
* Display a status column if the -J option is set.
*/
if (status_col || status_line)
{
char c = posmark(pos);
if (c != 0)
line_mark_attr = AT_HILITE|AT_COLOR_MARK;
else if (start_attnpos != NULL_POSITION &&
pos >= start_attnpos && pos <= end_attnpos)
line_mark_attr = AT_HILITE|AT_COLOR_ATTN;
if (status_col)
{
add_pfx(c ? c : ' ', line_mark_attr); /* column 0: status */
while (linebuf.pfx_end < (size_t) status_col_width) /*{{type-issue}}*/
add_pfx(' ', AT_NORMAL);
}
}
/*
* Display the line number at the start of each line
* if the -N option is set.
*/
if (linenums == OPT_ONPLUS)
{
char buf[INT_STRLEN_BOUND(linenum) + 2];
size_t len;
size_t i;
linenum = vlinenum(linenum);
if (linenum == 0)
len = 0;
else
{
linenumtoa(linenum, buf, 10);
len = strlen(buf);
}
for (i = 0; i < (size_t) linenum_width - len; i++)
add_pfx(' ', AT_NORMAL);
for (i = 0; i < len; i++)
add_pfx(buf[i], AT_BOLD|AT_COLOR_LINENUM);
add_pfx(' ', AT_NORMAL);
}
end_column = (int) linebuf.pfx_end; /*{{type-issue}}*/
}
/*
* Return the width of the line prefix (status column and line number).
* {{ Actual line number can be wider than linenum_width. }}
*/
public int line_pfx_width(void)
{
int width = 0;
if (status_col)
width += status_col_width;
if (linenums == OPT_ONPLUS)
width += linenum_width + 1;
return width;
}
/*
* Shift line left so that the last char is just to the left
* of the first visible column.
*/
public void pshift_all(void)
{
size_t i;
for (i = linebuf.print; i < linebuf.end; i++)
if (linebuf.attr[i] == AT_ANSI)
xbuf_add_char(&shifted_ansi, linebuf.buf[i]);
linebuf.end = linebuf.print;
end_column = (int) linebuf.pfx_end; /*{{type-issue}}*/
}
/*
* Return the printing width of the start (enter) sequence
* for a given character attribute.
*/
static int attr_swidth(int a)
{
int w = 0;
a = apply_at_specials(a);
if (a & AT_UNDERLINE)
w += ul_s_width;
if (a & AT_BOLD)
w += bo_s_width;
if (a & AT_BLINK)
w += bl_s_width;
if (a & AT_STANDOUT)
w += so_s_width;
return w;
}
/*
* Return the printing width of the end (exit) sequence
* for a given character attribute.
*/
static int attr_ewidth(int a)
{
int w = 0;
a = apply_at_specials(a);
if (a & AT_UNDERLINE)
w += ul_e_width;
if (a & AT_BOLD)
w += bo_e_width;
if (a & AT_BLINK)
w += bl_e_width;
if (a & AT_STANDOUT)
w += so_e_width;
return w;
}
/*
* Return the printing width of a given character and attribute,
* if the character were added after prev_ch.
* Adding a character with a given attribute may cause an enter or exit
* attribute sequence to be inserted, so this must be taken into account.
*/
public int pwidth(LWCHAR ch, int a, LWCHAR prev_ch, int prev_a)
{
int w;
if (ch == '\b')
{
/*
* Backspace moves backwards one or two positions.
*/
if (prev_a & (AT_ANSI|AT_BINARY))
return (int) strlen(prchar('\b')); /*{{type-issue}}*/
return (utf_mode && is_wide_char(prev_ch)) ? -2 : -1;
}
if (!utf_mode || is_ascii_char(ch))
{
if (control_char(ch))
{
/*
* Control characters do unpredictable things,
* so we don't even try to guess; say it doesn't move.
* This can only happen if the -r flag is in effect.
*/
return (0);
}
} else
{
if (is_composing_char(ch) || is_combining_char(prev_ch, ch))
{
/*
* Composing and combining chars take up no space.
*
* Some terminals, upon failure to compose a
* composing character with the character(s) that
* precede(s) it will actually take up one end_column
* for the composing character; there isn't much
* we could do short of testing the (complex)
* composition process ourselves and printing
* a binary representation when it fails.
*/
return (0);
}
}
/*
* Other characters take one or two columns,
* plus the width of any attribute enter/exit sequence.
*/
w = 1;
if (is_wide_char(ch))
w++;
if (linebuf.end > 0 && !is_at_equiv(linebuf.attr[linebuf.end-1], a))
w += attr_ewidth(linebuf.attr[linebuf.end-1]);
if (apply_at_specials(a) != AT_NORMAL &&
(linebuf.end == 0 || !is_at_equiv(linebuf.attr[linebuf.end-1], a)))
w += attr_swidth(a);
return (w);
}
/*
* Delete to the previous base character in the line buffer.
*/
static int backc(void)
{
LWCHAR ch;
char *p;
if (linebuf.end == 0)
return (0);
p = &linebuf.buf[linebuf.end];
ch = step_char(&p, -1, linebuf.buf);
/* Skip back to the next nonzero-width char. */
while (p > linebuf.buf)
{
LWCHAR prev_ch;
int width;
linebuf.end = ptr_diff(p, linebuf.buf);
prev_ch = step_char(&p, -1, linebuf.buf);
width = pwidth(ch, linebuf.attr[linebuf.end], prev_ch, linebuf.attr[linebuf.end-1]);
end_column -= width;
/* {{ right_column? }} */
if (width > 0)
break;
ch = prev_ch;
}
return (1);
}
/*
* Preserve the current position in the line buffer (for word wrapping).
*/
public void savec(void)
{
saved_line_end = linebuf.end;
saved_end_column = end_column;
}
/*
* Restore the position in the line buffer (start of line for word wrapping).
*/
public void loadc(void)
{
linebuf.end = saved_line_end;
end_column = saved_end_column;
}
/*
* Is a character the end of an ANSI escape sequence?
*/
public int is_ansi_end(LWCHAR ch)
{
if (!is_ascii_char(ch))
return (0);
return (strchr(end_ansi_chars, (char) ch) != NULL);
}
/*
* Can a char appear in an ANSI escape sequence, before the end char?
*/
public int is_ansi_middle(LWCHAR ch)
{
if (!is_ascii_char(ch))
return (0);
if (is_ansi_end(ch))
return (0);
return (strchr(mid_ansi_chars, (char) ch) != NULL);
}
/*
* Skip past an ANSI escape sequence.
* pp is initially positioned just after the CSI_START char.
*/
public void skip_ansi(struct ansi_state *pansi, constant char **pp, constant char *limit)
{
LWCHAR c;
do {
c = step_charc(pp, +1, limit);
} while (*pp < limit && ansi_step(pansi, c) == ANSI_MID);
/* Note that we discard final char, for which is_ansi_end is true. */
}
/*
* Determine if a character starts an ANSI escape sequence.
* If so, return an ansi_state struct; otherwise return NULL.
*/
public struct ansi_state * ansi_start(LWCHAR ch)
{
struct ansi_state *pansi;
if (!IS_CSI_START(ch))
return NULL;
pansi = ecalloc(1, sizeof(struct ansi_state));
pansi->hindex = 0;
pansi->hlink = 0;
pansi->prev_esc = 0;
return pansi;
}
/*
* Determine whether the next char in an ANSI escape sequence
* ends the sequence.
*/
public int ansi_step(struct ansi_state *pansi, LWCHAR ch)
{
if (pansi->hlink)
{
/* Hyperlink ends with \7 or ESC-backslash. */
if (ch == '\7')
return ANSI_END;
if (pansi->prev_esc)
return (ch == '\\') ? ANSI_END : ANSI_ERR;
pansi->prev_esc = (ch == ESC);
return ANSI_MID;
}
if (pansi->hindex >= 0)
{
static char hlink_prefix[] = ESCS "]8;";
if (ch == (LWCHAR) hlink_prefix[pansi->hindex] ||
(pansi->hindex == 0 && IS_CSI_START(ch)))
{
pansi->hindex++;
if (hlink_prefix[pansi->hindex] == '\0')
pansi->hlink = 1; /* now processing hyperlink addr */
return ANSI_MID;
}
pansi->hindex = -1; /* not a hyperlink */
}
/* Check for SGR sequences */
if (is_ansi_middle(ch))
return ANSI_MID;
if (is_ansi_end(ch))
return ANSI_END;
return ANSI_ERR;
}
/*
* Free an ansi_state structure.
*/
public void ansi_done(struct ansi_state *pansi)
{
free(pansi);
}
/*
* Will w characters in attribute a fit on the screen?
*/
static int fits_on_screen(int w, int a)
{
if (ctldisp == OPT_ON)
/* We're not counting, so say that everything fits. */
return 1;
return (end_column - cshift + w + attr_ewidth(a) <= sc_width);
}
/*
* Append a character and attribute to the line buffer.
*/
#define STORE_CHAR(ch,a,rep,pos) \
do { \
if (store_char((ch),(a),(rep),(pos))) return (1); \
} while (0)
static int store_char(LWCHAR ch, int a, constant char *rep, POSITION pos)
{
int w;
size_t i;
size_t replen;
char cs;
int ov;
ov = (a & (AT_UNDERLINE|AT_BOLD));
if (ov != AT_NORMAL)
last_overstrike = ov;
#if HILITE_SEARCH
{
int matches;
int resend_last = 0;
int hl_attr = 0;
if (pos == NULL_POSITION)
{
/* Color the prompt unless it has ansi sequences in it. */
hl_attr = ansi_in_line ? 0 : AT_STANDOUT|AT_COLOR_PROMPT;
} else if (a != AT_ANSI)
{
hl_attr = is_hilited_attr(pos, pos+1, 0, &matches);
if (hl_attr == 0 && status_line)
hl_attr = line_mark_attr;
}
if (hl_attr)
{
/*
* This character should be highlighted.
* Override the attribute passed in.
*/
a |= hl_attr;
if (highest_hilite != NULL_POSITION && pos != NULL_POSITION && pos > highest_hilite)
highest_hilite = pos;
in_hilite = 1;
} else
{
if (in_hilite)
{
/*
* This is the first non-hilited char after a hilite.
* Resend the last ANSI seq to restore color.
*/
resend_last = 1;
}
in_hilite = 0;
}
if (resend_last)
{
int ai;
for (ai = 0; ai < NUM_LAST_ANSIS; ai++)
{
int ax = (curr_last_ansi + ai) % NUM_LAST_ANSIS;
for (i = 0; i < last_ansis[ax].end; i++)
STORE_CHAR(last_ansis[ax].data[i], AT_ANSI, NULL, pos);
}
}
}
#endif
if (a == AT_ANSI) {
w = 0;
} else {
char *p = &linebuf.buf[linebuf.end];
LWCHAR prev_ch = (linebuf.end > 0) ? step_char(&p, -1, linebuf.buf) : 0;
int prev_a = (linebuf.end > 0) ? linebuf.attr[linebuf.end-1] : 0;
w = pwidth(ch, a, prev_ch, prev_a);
}
if (!fits_on_screen(w, a))
return (1);
if (rep == NULL)
{
cs = (char) ch;
rep = &cs;
replen = 1;
} else
{
replen = (size_t) utf_len(rep[0]); /*{{type-issue}}*/
}
if (cshift == hshift)
{
if (line_pos == NULL_POSITION)
line_pos = pos;
if (shifted_ansi.end > 0)
{
/* Copy shifted ANSI sequences to beginning of line. */
for (i = 0; i < shifted_ansi.end; i++)
add_linebuf((char) shifted_ansi.data[i], AT_ANSI, 0);
xbuf_reset(&shifted_ansi);
}
}
/* Add the char to the buf, even if we will left-shift it next. */
inc_end_column(w);
for (i = 0; i < replen; i++)
add_linebuf(*rep++, a, 0);
if (cshift < hshift)
{
/* We haven't left-shifted enough yet. */
if (a == AT_ANSI)
xbuf_add_char(&shifted_ansi, (char) ch); /* Save ANSI attributes */
if (linebuf.end > linebuf.print)
{
/* Shift left enough to put last byte of this char at print-1. */
size_t i;
for (i = 0; i < linebuf.print; i++)
{
linebuf.buf[i] = linebuf.buf[i+replen];
linebuf.attr[i] = linebuf.attr[i+replen];
}
linebuf.end -= replen;
cshift += w;
/*
* If the char we just left-shifted was double width,
* the 2 spaces we shifted may be too much.
* Represent the "half char" at start of line with a highlighted space.
*/
while (cshift > hshift)
{
add_linebuf(' ', rscroll_attr, 0);
cshift--;
}
}
}
return (0);
}
#define STORE_STRING(s,a,pos) \
do { if (store_string((s),(a),(pos))) return (1); } while (0)
static int store_string(constant char *s, int a, POSITION pos)
{
if (!fits_on_screen((int) strlen(s), a))
return 1;
for ( ; *s != 0; s++)
STORE_CHAR((LWCHAR)*s, a, NULL, pos);
return 0;
}
/*
* Append a tab to the line buffer.
* Store spaces to represent the tab.
*/
#define STORE_TAB(a,pos) \
do { if (store_tab((a),(pos))) return (1); } while (0)
static int store_tab(int attr, POSITION pos)
{
int to_tab = end_column - (int) linebuf.pfx_end; /*{{type-issue}}*/
if (ntabstops < 2 || to_tab >= tabstops[ntabstops-1])
to_tab = tabdefault -
((to_tab - tabstops[ntabstops-1]) % tabdefault);
else
{
int i;
for (i = ntabstops - 2; i >= 0; i--)
if (to_tab >= tabstops[i])
break;
to_tab = tabstops[i+1] - to_tab;
}
do {
STORE_CHAR(' ', attr, " ", pos);
} while (--to_tab > 0);
return 0;
}
#define STORE_PRCHAR(c, pos) \
do { if (store_prchar((c), (pos))) return 1; } while (0)
static int store_prchar(LWCHAR c, POSITION pos)
{
/*
* Convert to printable representation.
*/
STORE_STRING(prchar(c), AT_BINARY|AT_COLOR_CTRL, pos);
return 0;
}
static int flush_mbc_buf(POSITION pos)
{
int i;
for (i = 0; i < mbc_buf_index; i++)
if (store_prchar((LWCHAR) mbc_buf[i], pos))
return mbc_buf_index - i;
return 0;
}
/*
* Append a character to the line buffer.
* Expand tabs into spaces, handle underlining, boldfacing, etc.
* Returns 0 if ok, 1 if couldn't fit in buffer.
*/
public int pappend(char c, POSITION pos)
{
int r;
if (pendc)
{
if (c == '\r' && pendc == '\r')
return (0);
if (do_append(pendc, NULL, pendpos))
/*
* Oops. We've probably lost the char which
* was in pendc, since caller won't back up.
*/
return (1);
pendc = '\0';
}
if (c == '\r' && (proc_return == OPT_ON || (bs_mode == BS_SPECIAL && proc_return == OPT_OFF)))
{
if (mbc_buf_len > 0) /* utf_mode must be on. */
{
/* Flush incomplete (truncated) sequence. */
r = flush_mbc_buf(mbc_pos);
mbc_buf_index = r + 1;
mbc_buf_len = 0;
if (r)
return (mbc_buf_index);
}
/*
* Don't put the CR into the buffer until we see
* the next char. If the next char is a newline,
* discard the CR.
*/
pendc = (LWCHAR) c;
pendpos = pos;
return (0);
}
if (!utf_mode)
{
r = do_append((LWCHAR) c, NULL, pos);
} else
{
/* Perform strict validation in all possible cases. */
if (mbc_buf_len == 0)
{
retry:
mbc_buf_index = 1;
*mbc_buf = c;
if (IS_ASCII_OCTET(c))
r = do_append((LWCHAR) c, NULL, pos);
else if (IS_UTF8_LEAD(c))
{
mbc_buf_len = utf_len(c);
mbc_pos = pos;
return (0);
} else
/* UTF8_INVALID or stray UTF8_TRAIL */
r = flush_mbc_buf(pos);
} else if (IS_UTF8_TRAIL(c))
{
mbc_buf[mbc_buf_index++] = c;
if (mbc_buf_index < mbc_buf_len)
return (0);
if (is_utf8_well_formed(mbc_buf, mbc_buf_index))
r = do_append(get_wchar(mbc_buf), mbc_buf, mbc_pos);
else
/* Complete, but not shortest form, sequence. */
mbc_buf_index = r = flush_mbc_buf(mbc_pos);
mbc_buf_len = 0;
} else
{
/* Flush incomplete (truncated) sequence. */
r = flush_mbc_buf(mbc_pos);
mbc_buf_index = r + 1;
mbc_buf_len = 0;
/* Handle new char. */
if (!r)
goto retry;
}
}
if (r)
{
/* How many chars should caller back up? */
r = (!utf_mode) ? 1 : mbc_buf_index;
}
return (r);
}
static int store_control_char(LWCHAR ch, constant char *rep, POSITION pos)
{
if (ctldisp == OPT_ON)
{
/* Output the character itself. */
STORE_CHAR(ch, AT_NORMAL, rep, pos);
} else
{
/* Output a printable representation of the character. */
STORE_PRCHAR(ch, pos);
}
return (0);
}
static int store_ansi(LWCHAR ch, constant char *rep, POSITION pos)
{
switch (ansi_step(line_ansi, ch))
{
case ANSI_MID:
STORE_CHAR(ch, AT_ANSI, rep, pos);
if (line_ansi->hlink)
hlink_in_line = 1;
xbuf_add_char(&last_ansi, (char) ch);
break;
case ANSI_END:
STORE_CHAR(ch, AT_ANSI, rep, pos);
ansi_done(line_ansi);
line_ansi = NULL;
xbuf_add_char(&last_ansi, (char) ch);