2 * fbpad - a small framebuffer virtual terminal
4 * Copyright (C) 2009-2011 Ali Gholami Rudi <ali at rudi dot ir>
6 * This program is released under GNU GPL version 2.
14 #include <sys/ioctl.h>
26 #define CTRLKEY(x) ((x) - 96)
27 #define BADPOLLFLAGS (POLLHUP | POLLERR | POLLNVAL)
28 #define NTAGS (sizeof(tags) - 1)
29 #define NTERMS (NTAGS * 2)
30 #define TERMOPEN(i) (terms[i].fd)
31 #define TERMSNAP(i) (strchr(TAGS_SAVED, tags[(i) % NTAGS]))
33 static char tags
[] = TAGS
;
34 static struct term terms
[NTERMS
];
35 static int tops
[NTAGS
]; /* top terms of tags */
36 static int ctag
; /* current tag */
37 static int ltag
; /* the last tag */
41 static int readchar(void)
44 if (read(STDIN_FILENO
, &b
, 1) > 0)
49 static int cterm(void)
51 return tops
[ctag
] * NTAGS
+ ctag
;
54 static void term_switch(int oidx
, int nidx
, int show
, int save
, int load
)
56 int flags
= show
? (load
? TERM_REDRAW
: TERM_VISIBLE
) : TERM_HIDDEN
;
57 if (save
&& TERMOPEN(oidx
) && TERMSNAP(oidx
))
58 scr_snap(&terms
[oidx
]);
59 term_save(&terms
[oidx
]);
60 if (show
&& load
&& TERMOPEN(nidx
) && TERMSNAP(nidx
))
61 flags
= scr_load(&terms
[nidx
]) ? TERM_REDRAW
: TERM_VISIBLE
;
62 term_load(&terms
[nidx
], flags
);
65 static void showterm(int n
)
69 if (ctag
!= n
% NTAGS
)
71 term_switch(cterm(), n
, !hidden
, !hidden
, !hidden
);
73 tops
[ctag
] = n
/ NTAGS
;
76 static void showtag(int n
)
78 showterm(tops
[n
] * NTAGS
+ n
);
81 static struct term
*mainterm(void)
83 if (TERMOPEN(cterm()))
84 return &terms
[cterm()];
88 static void exec_cmd(char *file
)
94 static int altterm(int n
)
96 return n
< NTAGS
? n
+ NTAGS
: n
- NTAGS
;
99 static void nextterm(void)
101 int n
= (cterm() + 1) % NTERMS
;
102 while (n
!= cterm()) {
107 n
= (n
+ 1) % NTERMS
;
111 static void showtags(void)
113 int colors
[] = {15, 4, 2};
115 int r
= pad_rows() - 1;
117 pad_put('T', r
, c
++, FGCOLOR
, BGCOLOR
);
118 pad_put('A', r
, c
++, FGCOLOR
, BGCOLOR
);
119 pad_put('G', r
, c
++, FGCOLOR
, BGCOLOR
);
120 pad_put('S', r
, c
++, FGCOLOR
, BGCOLOR
);
121 pad_put(':', r
, c
++, FGCOLOR
, BGCOLOR
);
122 pad_put(' ', r
, c
++, FGCOLOR
, BGCOLOR
);
123 for (i
= 0; i
< NTAGS
; i
++) {
127 if (TERMOPEN(altterm(i
)))
129 pad_put(i
== ctag
? '(' : ' ', r
, c
++, FGCOLOR
, BGCOLOR
);
131 pad_put(tags
[i
], r
, c
++, !nt
? BGCOLOR
: colors
[nt
], 15);
133 pad_put(tags
[i
], r
, c
++, colors
[nt
], BGCOLOR
);
134 pad_put(i
== ctag
? ')' : ' ', r
, c
++, FGCOLOR
, BGCOLOR
);
138 static void directkey(void)
142 switch ((c
= readchar())) {
154 showterm(altterm(cterm()));
172 term_switch(cterm(), cterm(), 1, 0, 1);
175 if (strchr(tags
, c
)) {
176 showtag(strchr(tags
, c
) - tags
);
183 if (c
!= -1 && mainterm())
187 static void temp_switch(int termid
)
189 if (termid
!= cterm())
190 term_switch(cterm(), termid
, 0, 0, 0);
193 static void switch_back(int termid
)
195 if (termid
!= cterm())
196 term_switch(termid
, cterm(), 1, 0, 0);
199 static int poll_all(void)
201 struct pollfd ufds
[NTERMS
+ 1];
202 int term_idx
[NTERMS
+ 1];
205 ufds
[0].fd
= STDIN_FILENO
;
206 ufds
[0].events
= POLLIN
;
207 for (i
= 0; i
< NTERMS
; i
++) {
209 ufds
[n
].fd
= terms
[i
].fd
;
210 ufds
[n
].events
= POLLIN
;
214 if (poll(ufds
, n
, 1000) < 1)
216 if (ufds
[0].revents
& BADPOLLFLAGS
)
218 if (ufds
[0].revents
& POLLIN
)
220 for (i
= 1; i
< n
; i
++) {
221 temp_switch(term_idx
[i
]);
222 if (ufds
[i
].revents
& POLLIN
)
224 if (ufds
[i
].revents
& BADPOLLFLAGS
) {
225 scr_free(&terms
[cterm()]);
228 switch_back(term_idx
[i
]);
233 static void mainloop(void)
235 struct termios oldtermios
, termios
;
236 tcgetattr(STDIN_FILENO
, &termios
);
237 oldtermios
= termios
;
239 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, &termios
);
240 term_load(&terms
[cterm()], TERM_REDRAW
);
244 tcsetattr(STDIN_FILENO
, 0, &oldtermios
);
247 static void signalreceived(int n
);
248 static void signalregister(void)
250 signal(SIGUSR1
, signalreceived
);
251 signal(SIGUSR2
, signalreceived
);
252 signal(SIGCHLD
, signalreceived
);
255 static void signalreceived(int n
)
259 /* racy, new signals may arrive before re-registeration */
264 term_switch(cterm(), cterm(), 0, 1, 0);
265 ioctl(STDIN_FILENO
, VT_RELDISP
, 1);
270 term_switch(cterm(), cterm(), 1, 0, 1);
273 while (waitpid(-1, NULL
, WNOHANG
) > 0)
279 static void setupsignals(void)
282 vtm
.mode
= VT_PROCESS
;
284 vtm
.relsig
= SIGUSR1
;
285 vtm
.acqsig
= SIGUSR2
;
288 ioctl(STDIN_FILENO
, VT_SETMODE
, &vtm
);
293 char *hide
= "\x1b[?25l";
294 char *clear
= "\x1b[2J\x1b[H";
295 char *show
= "\x1b[?25h";
296 write(STDOUT_FILENO
, clear
, strlen(clear
));
297 write(STDIN_FILENO
, hide
, strlen(hide
));
301 fcntl(STDIN_FILENO
, F_SETFL
,
302 fcntl(STDIN_FILENO
, F_GETFL
) | O_NONBLOCK
);
306 write(STDIN_FILENO
, show
, strlen(show
));