17 #define MODE_CURSOR 0x01
18 #define MODE_WRAP 0x02
19 #define MODE_ORIGIN 0x04
20 #define MODE_AUTOCR 0x08
21 #define MODE_DEFAULT (MODE_CURSOR | MODE_WRAP)
22 #define ATTR_BOLD 0x10
24 #define ATTR_ALL (ATTR_BOLD | ATTR_REV)
25 #define MODE_INSERT 0x40
26 #define MODE_WRAPREADY 0x80
28 #define BIT_SET(i, b, val) ((val) ? ((i) | (b)) : ((i) & ~(b)))
29 #define OFFSET(r, c) ((r) * pad_cols() + (c))
31 static struct term
*term
;
33 static char *fgs
, *bgs
;
40 /* low level drawing and lazy updating */
42 #define MAXLINES (1 << 8)
43 static int dirty
[MAXLINES
];
46 static char fgcolor(void)
48 int c
= mode
& ATTR_REV
? bg
: fg
;
49 return mode
& ATTR_BOLD
? c
| 0x08 : c
;
52 static char bgcolor(void)
54 return mode
& ATTR_REV
? fg
: bg
;
57 static void _draw_pos(int r
, int c
, int cursor
)
59 int rev
= cursor
&& mode
& MODE_CURSOR
;
61 char fg
= rev
? bgs
[i
] : fgs
[i
];
62 char bg
= rev
? fgs
[i
] : bgs
[i
];
64 pad_put(screen
[i
], r
, c
, fg
, bg
);
67 static void _draw_row(int r
)
70 pad_blankrow(r
, bgcolor());
71 for (i
= 0; i
< pad_cols(); i
++) {
72 int c
= screen
[OFFSET(r
, i
)];
73 if ((c
&& c
!= ' ') || bgs
[OFFSET(r
, i
)] != bgcolor())
78 static int candraw(int sr
, int er
)
84 for (i
= sr
; i
< er
; i
++)
89 static void draw_rows(int sr
, int er
)
93 for (i
= sr
; i
< er
; i
++)
97 static void draw_cols(int r
, int sc
, int ec
)
100 if (candraw(r
, r
+ 1))
101 for (i
= sc
; i
< ec
; i
++)
105 static void draw_char(int ch
, int r
, int c
)
107 int i
= OFFSET(r
, c
);
111 if (candraw(r
, r
+ 1))
115 static void draw_cursor(int put
)
117 if (candraw(row
, row
+ 1))
118 _draw_pos(row
, col
, put
);
121 static void lazy_start(void)
123 memset(dirty
, 0, sizeof(dirty
));
127 static void lazy_flush(void)
132 _draw_pos(row
, col
, 0);
133 for (i
= 0; i
< pad_rows(); i
++)
136 _draw_pos(row
, col
, 1);
139 static void screen_reset(int i
, int n
)
141 memset(screen
+ i
, 0, n
* sizeof(*screen
));
142 memset(fgs
+ i
, fg
, n
);
143 memset(bgs
+ i
, bg
, n
);
146 static void screen_move(int dst
, int src
, int n
)
148 memmove(screen
+ dst
, screen
+ src
, n
* sizeof(*screen
));
149 memmove(fgs
+ dst
, fgs
+ src
, n
);
150 memmove(bgs
+ dst
, bgs
+ src
, n
);
153 /* terminal input buffering */
155 #define PTYBUFSIZE (1 << 13)
157 static char ptybuf
[PTYBUFSIZE
]; /* always emptied in term_read() */
158 static int ptylen
; /* buffer length */
159 static int ptycur
; /* current offset */
161 static void waitpty(void)
163 struct pollfd ufds
[1];
164 ufds
[0].fd
= term
->fd
;
165 ufds
[0].events
= POLLIN
;
169 static int readpty(void)
172 return ptybuf
[ptycur
++];
175 ptylen
= read(term
->fd
, ptybuf
, PTYBUFSIZE
);
176 if (ptylen
== -1 && errno
== EAGAIN
) {
178 ptylen
= read(term
->fd
, ptybuf
, PTYBUFSIZE
);
187 /* term interface functions */
189 void term_send(int c
)
193 write(term
->fd
, &b
, 1);
196 static void term_sendstr(char *s
)
199 write(term
->fd
, s
, strlen(s
));
202 static void term_blank(void)
204 screen_reset(0, pad_rows() * pad_cols());
206 pad_blank(bgcolor());
209 static void ctlseq(void);
213 while (ptycur
< ptylen
) {
214 if (!lazy
&& ptylen
- ptycur
> 15)
223 static void term_reset(void)
234 static int _openpty(int *master
, int *slave
)
239 if ((*master
= open("/dev/ptmx", O_RDWR
)) == -1)
241 if (ioctl(*master
, TIOCSPTLCK
, &unlock
) == -1)
243 if (ioctl(*master
, TIOCGPTN
, &ptyno
) == -1)
245 sprintf(name
, "/dev/pts/%d", ptyno
);
246 *slave
= open(name
, O_RDWR
| O_NOCTTY
);
250 static void _login(int fd
)
253 winp
.ws_col
= pad_cols();
254 winp
.ws_row
= pad_rows();
258 ioctl(fd
, TIOCSCTTY
, NULL
);
259 ioctl(fd
, TIOCSWINSZ
, &winp
);
267 #define MAXENV (1 << 8)
269 static void envcpy(char **d
, char **s
)
276 static void execvep(char *cmd
, char **argv
, char **envp
)
279 char *p
= getenv("PATH");
280 execve(cmd
, argv
, envp
);
283 while (*p
&& *p
!= ':')
287 execve(path
, argv
, envp
);
293 extern char **environ
;
294 void term_exec(char *cmd
)
297 memset(term
, 0, sizeof(*term
));
298 if (_openpty(&master
, &slave
) == -1)
300 if ((term
->pid
= fork()) == -1)
303 char *envp
[MAXENV
] = {"TERM=linux"};
304 char *argv
[2] = {cmd
};
305 envcpy(envp
+ 1, environ
);
308 execvep(cmd
, argv
, envp
);
313 fcntl(term
->fd
, F_SETFD
, fcntl(term
->fd
, F_GETFD
) | FD_CLOEXEC
);
314 fcntl(term
->fd
, F_SETFL
, fcntl(term
->fd
, F_GETFL
) | O_NONBLOCK
);
318 static void misc_save(struct term_state
*state
)
327 static void misc_load(struct term_state
*state
)
336 void term_save(struct term
*term
)
339 misc_save(&term
->cur
);
344 static void term_redraw(void)
347 for (i
= 0; i
< pad_rows(); i
++)
349 _draw_pos(row
, col
, 1);
352 void term_load(struct term
*t
, int flags
)
355 misc_load(&term
->cur
);
356 screen
= term
->screen
;
362 if (flags
== TERM_REDRAW
) {
374 memset(term
, 0, sizeof(*term
));
375 term_load(term
, visible
? TERM_REDRAW
: TERM_HIDDEN
);
378 static int writeutf8(char *dst
, int c
)
387 *d
++ = 0xf0 | (c
>> 18);
389 } else if (c
> 0x7ff) {
390 *d
++ = 0xe0 | (c
>> 12);
392 } else if (c
> 0x7f) {
393 *d
++ = 0xc0 | (c
>> 6);
397 *d
++ = 0x80 | ((c
>> (l
* 6)) & 0x3f);
401 void term_screenshot(void)
404 int fd
= open(SCRSHOT
, O_CREAT
| O_TRUNC
| O_WRONLY
, 0600);
406 for (i
= 0; i
< pad_rows(); i
++) {
408 for (j
= 0; j
< pad_cols(); j
++)
409 s
+= writeutf8(s
, screen
[OFFSET(i
, j
)]);
411 write(fd
, buf
, s
- buf
);
416 /* high-level drawing functions */
418 static void empty_rows(int sr
, int er
)
420 screen_reset(OFFSET(sr
, 0), (er
- sr
) * pad_cols());
423 static void blank_rows(int sr
, int er
)
430 static void scroll_screen(int sr
, int nr
, int n
)
433 screen_move(OFFSET(sr
+ n
, 0), OFFSET(sr
, 0), nr
* pad_cols());
435 empty_rows(sr
, sr
+ n
);
437 empty_rows(sr
+ nr
+ n
, sr
+ nr
);
438 draw_rows(MIN(sr
, sr
+ n
), MAX(sr
+ nr
, sr
+ nr
+ n
));
442 static void insert_lines(int n
)
444 int sr
= MAX(top
, row
);
445 int nr
= bot
- row
- n
;
447 scroll_screen(sr
, nr
, n
);
450 static void delete_lines(int n
)
452 int r
= MAX(top
, row
);
454 int nr
= bot
- r
- n
;
456 scroll_screen(sr
, nr
, -n
);
459 static int origin(void)
461 return mode
& MODE_ORIGIN
;
464 static void move_cursor(int r
, int c
)
468 t
= origin() ? top
: 0;
469 b
= origin() ? bot
: pad_rows();
470 row
= MAX(t
, MIN(r
, b
- 1));
471 col
= MAX(0, MIN(c
, pad_cols() - 1));
473 mode
= BIT_SET(mode
, MODE_WRAPREADY
, 0);
476 static void set_region(int t
, int b
)
478 top
= MIN(pad_rows() - 1, MAX(0, t
- 1));
479 bot
= MIN(pad_rows(), MAX(top
+ 1, b
? b
: pad_rows()));
484 static void setattr(int m
)
506 fg
= m
> 37 ? FGCOLOR
: m
- 30;
508 bg
= m
> 47 ? BGCOLOR
: m
- 40;
512 static void kill_chars(int sc
, int ec
)
515 for (i
= sc
; i
< ec
; i
++)
516 draw_char(' ', row
, i
);
520 static void move_chars(int sc
, int nc
, int n
)
523 screen_move(OFFSET(row
, sc
+ n
), OFFSET(row
, sc
), nc
);
525 screen_reset(OFFSET(row
, sc
), n
);
527 screen_reset(OFFSET(row
, pad_cols() + n
), -n
);
528 draw_cols(row
, MIN(sc
, sc
+ n
), pad_cols());
532 static void delete_chars(int n
)
535 int nc
= pad_cols() - sc
;
536 move_chars(sc
, nc
, -n
);
539 static void insert_chars(int n
)
541 int nc
= pad_cols() - col
- n
;
542 move_chars(col
, nc
, n
);
545 static void advance(int dr
, int dc
, int scrl
)
549 if (dr
&& r
>= bot
&& scrl
) {
551 int nr
= (bot
- top
) + n
;
552 scroll_screen(top
+ -n
, nr
, n
);
554 if (dr
&& r
< top
&& scrl
) {
556 int nr
= (bot
- top
) - n
;
557 scroll_screen(top
, nr
, n
);
559 r
= dr
? MIN(bot
- 1, MAX(top
, r
)) : r
;
560 c
= MIN(pad_cols() - 1, MAX(0, c
));
564 static void insertchar(int c
)
567 if (mode
& MODE_WRAPREADY
)
569 if (mode
& MODE_INSERT
)
571 draw_char(c
, row
, col
);
572 wrapready
= col
== pad_cols() - 1;
575 mode
= BIT_SET(mode
, MODE_WRAPREADY
, 1);
579 /* partial vt102 implementation */
581 static void escseq(void);
582 static void escseq_cs(void);
583 static void escseq_g0(void);
584 static void escseq_g1(void);
585 static void escseq_g2(void);
586 static void escseq_g3(void);
587 static void csiseq(void);
588 static void csiseq_da(int c
);
589 static void csiseq_dsr(int c
);
590 static void modeseq(int c
, int set
);
592 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
594 static int readutf8(int c
)
600 while (l
< 6 && c
& (0x40 >> l
))
602 result
= (0x3f >> l
) & c
;
604 result
= (result
<< 6) | (readpty() & 0x3f);
608 #define unknown(ctl, c)
610 /* control sequences */
611 static void ctlseq(void)
615 case 0x09: /* HT horizontal tab to next tab stop */
616 advance(0, 8 - col
% 8, 0);
618 case 0x0a: /* LF line feed */
619 case 0x0b: /* VT line feed */
620 case 0x0c: /* FF line feed */
621 advance(1, (mode
& MODE_AUTOCR
) ? -col
: 0, 1);
623 case 0x08: /* BS backspace one column */
626 case 0x1b: /* ESC start escape sequence */
629 case 0x0d: /* CR carriage return */
632 case 0x00: /* NUL ignored */
633 case 0x07: /* BEL beep */
634 case 0x7f: /* DEL ignored */
636 case 0x05: /* ENQ trigger answerback message */
637 case 0x0e: /* SO activate G1 character set & newline */
638 case 0x0f: /* SI activate G0 character set */
639 case 0x11: /* XON resume transmission */
640 case 0x13: /* XOFF stop transmission, ignore characters */
641 case 0x18: /* CAN interrupt escape sequence */
642 case 0x1a: /* SUB interrupt escape sequence */
643 case 0x9b: /* CSI equivalent to ESC [ */
644 unknown("ctlseq", c
);
647 insertchar(readutf8(c
));
652 #define ESCM(c) (((c) & 0xf0) == 0x20)
653 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
655 /* escape sequences */
656 static void escseq(void)
662 case '[': /* CSI control sequence introducer */
665 case '%': /* CS... escseq_cs table */
668 case '(': /* G0... escseq_g0 table */
671 case ')': /* G1... escseq_g1 table */
674 case '*': /* G2... escseq_g2 table */
677 case '+': /* G3... escseq_g3 table */
680 case '7': /* DECSC save state (position, charset, attributes) */
681 misc_save(&term
->sav
);
683 case '8': /* DECRC restore most recently saved state */
684 misc_load(&term
->sav
);
686 case 'M': /* RI reverse line feed */
689 case 'D': /* IND line feed */
692 case 'E': /* NEL newline */
695 case 'c': /* RIS reset */
698 case 'H': /* HTS set tab stop at current column */
699 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
700 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
701 case '>': /* DECPNM set numeric keypad mode */
702 case '=': /* DECPAM set application keypad mode */
703 case 'N': /* SS2 select G2 charset for next char only */
704 case 'O': /* SS3 select G3 charset for next char only */
705 case 'P': /* DCS device control string (ended by ST) */
706 case 'X': /* SOS start of string */
707 case '^': /* PM privacy message (ended by ST) */
708 case '_': /* APC application program command (ended by ST) */
709 case '\\': /* ST string terminator */
710 case 'n': /* LS2 invoke G2 charset */
711 case 'o': /* LS3 invoke G3 charset */
712 case '|': /* LS3R invoke G3 charset as GR */
713 case '}': /* LS2R invoke G2 charset as GR */
714 case '~': /* LS1R invoke G1 charset as GR */
715 case ']': /* OSC operating system command */
716 case 'g': /* BEL alternate BEL */
718 unknown("escseq", c
);
723 static void escseq_cs(void)
727 case '@': /* CSDFL select default charset (ISO646/8859-1) */
728 case 'G': /* CSUTF8 select UTF-8 */
729 case '8': /* CSUTF8 select UTF-8 (obsolete) */
731 unknown("escseq_cs", c
);
736 static void escseq_g0(void)
740 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
741 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
742 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
743 case 'K': /* G0USR G0 charset = user defined mapping */
744 case 'B': /* G0TXT G0 charset = ASCII mapping */
746 unknown("escseq_g0", c
);
751 static void escseq_g1(void)
755 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
756 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
757 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
758 case 'K': /* G1USR G1 charset = user defined mapping */
759 case 'B': /* G1TXT G1 charset = ASCII mapping */
761 unknown("escseq_g1", c
);
766 static void escseq_g2(void)
770 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
771 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
772 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
773 case 'K': /* G2USR G2 charset = user defined mapping */
775 unknown("escseq_g2", c
);
780 static void escseq_g3(void)
784 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
785 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
786 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
787 case 'K': /* G3USR G3 charset = user defined mapping */
789 unknown("escseq_g3", c
);
794 static int absrow(int r
)
796 return origin() ? top
+ r
: r
;
799 #define CSIP(c) (((c) & 0xf0) == 0x30)
800 #define CSII(c) (((c) & 0xf0) == 0x20)
801 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
803 #define MAXCSIARGS 32
804 /* ECMA-48 CSI sequences */
805 static void csiseq(void)
807 int args
[MAXCSIARGS
] = {0};
813 if (strchr("<=>?", c
)) {
820 arg
= arg
* 10 + (c
- '0');
826 n
= n
< ARRAY_SIZE(args
) ? n
+ 1 : 0;
831 case 'H': /* CUP move cursor to row, column */
832 case 'f': /* HVP move cursor to row, column */
833 move_cursor(absrow(MAX(0, args
[0] - 1)), MAX(0, args
[1] - 1));
835 case 'J': /* ED erase display */
838 kill_chars(col
, pad_cols());
839 blank_rows(row
+ 1, pad_rows());
842 kill_chars(0, col
+ 1);
843 blank_rows(0, row
- 1);
850 case 'A': /* CUU move cursor up */
851 advance(-MAX(1, args
[0]), 0, 0);
853 case 'e': /* VPR move cursor down */
854 case 'B': /* CUD move cursor down */
855 advance(MAX(1, args
[0]), 0, 0);
857 case 'a': /* HPR move cursor right */
858 case 'C': /* CUF move cursor right */
859 advance(0, MAX(1, args
[0]), 0);
861 case 'D': /* CUB move cursor left */
862 advance(0, -MAX(1, args
[0]), 0);
864 case 'K': /* EL erase line */
867 kill_chars(col
, pad_cols());
870 kill_chars(0, col
+ 1);
873 kill_chars(0, pad_cols());
877 case 'L': /* IL insert blank lines */
878 if (row
>= top
&& row
< bot
)
879 insert_lines(MAX(1, args
[0]));
881 case 'M': /* DL delete lines */
882 if (row
>= top
&& row
< bot
)
883 delete_lines(MAX(1, args
[0]));
885 case 'd': /* VPA move to row (current column) */
886 move_cursor(absrow(MAX(1, args
[0]) - 1), col
);
888 case 'm': /* SGR set graphic rendition */
891 for (i
= 0; i
< n
; i
++)
894 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
895 set_region(args
[0], args
[1]);
897 case 'c': /* DA return ESC [ ? 6 c (VT102) */
898 csiseq_da(priv
== '?' ? args
[0] | 0x80 : args
[0]);
900 case 'h': /* SM set mode */
901 for (i
= 0; i
< n
; i
++)
902 modeseq(priv
== '?' ? args
[i
] | 0x80 : args
[i
], 1);
904 case 'l': /* RM reset mode */
905 for (i
= 0; i
< n
; i
++)
906 modeseq(priv
== '?' ? args
[i
] | 0x80 : args
[i
], 0);
908 case 'P': /* DCH delete characters on current line */
909 delete_chars(MIN(MAX(1, args
[0]), pad_cols() - col
));
911 case '@': /* ICH insert blank characters */
912 insert_chars(MAX(1, args
[0]));
914 case 'n': /* DSR device status report */
917 case 'G': /* CHA move cursor to column in current row */
918 advance(0, MAX(0, args
[0] - 1) - col
, 0);
920 case 'X': /* ECH erase characters on current line */
921 kill_chars(col
, MIN(col
+ MAX(1, args
[0]), pad_cols()));
923 case '[': /* IGN ignored control sequence */
924 case 'E': /* CNL move cursor down and to column 1 */
925 case 'F': /* CPL move cursor up and to column 1 */
926 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
927 case 'q': /* DECLL set keyboard LEDs */
928 case 's': /* CUPSV save cursor position */
929 case 'u': /* CUPRS restore cursor position */
930 case '`': /* HPA move cursor to column in current row */
932 unknown("csiseq", c
);
937 static void csiseq_da(int c
)
941 term_sendstr("\x1b[?6c");
944 /* we don't care much about cursor shape */
945 /* printf("csiseq_da <0x%x>\n", c); */
950 static void csiseq_dsr(int c
)
955 term_sendstr("\x1b[0n");
958 sprintf(status
, "\x1b[%d;%dR",
959 (origin() ? row
- top
: row
) + 1, col
+ 1);
960 term_sendstr(status
);
963 unknown("csiseq_dsr", c
);
968 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
969 static void modeseq(int c
, int set
)
972 case 0x87: /* DECAWM Auto Wrap */
973 mode
= BIT_SET(mode
, MODE_WRAP
, set
);
975 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
976 mode
= BIT_SET(mode
, MODE_CURSOR
, set
);
978 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
979 mode
= BIT_SET(mode
, MODE_ORIGIN
, set
);
981 case 0x14: /* LNM Line Feed / New Line Mode */
982 mode
= BIT_SET(mode
, MODE_AUTOCR
, set
);
984 case 0x04: /* IRM insertion/replacement mode (always reset) */
985 mode
= BIT_SET(mode
, MODE_INSERT
, set
);
987 case 0x00: /* IGN Error (Ignored) */
988 case 0x01: /* GATM guarded-area transfer mode (ignored) */
989 case 0x02: /* KAM keyboard action mode (always reset) */
990 case 0x03: /* CRM control representation mode (always reset) */
991 case 0x05: /* SRTM status-reporting transfer mode */
992 case 0x06: /* ERM erasure mode (always set) */
993 case 0x07: /* VEM vertical editing mode (ignored) */
994 case 0x0a: /* HEM horizontal editing mode */
995 case 0x0b: /* PUM positioning unit mode */
996 case 0x0c: /* SRM send/receive mode (echo on/off) */
997 case 0x0d: /* FEAM format effector action mode */
998 case 0x0e: /* FETM format effector transfer mode */
999 case 0x0f: /* MATM multiple area transfer mode */
1000 case 0x10: /* TTM transfer termination mode */
1001 case 0x11: /* SATM selected area transfer mode */
1002 case 0x12: /* TSM tabulation stop mode */
1003 case 0x13: /* EBM editing boundary mode */
1004 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1005 case 0x80: /* IGN Error (Ignored) */
1006 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1007 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1008 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1009 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1010 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1011 case 0x88: /* DECARM Auto Repeat */
1012 case 0x89: /* DECINLM Interlace */
1013 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1014 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1016 unknown("modeseq", c
);