2 * fbpad - a small framebuffer virtual terminal
4 * Copyright (C) 2009-2012 Ali Gholami Rudi <ali at rudi dot ir>
6 * This program is released under the modified BSD license.
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 char pass
[1024];
44 static int readchar(void)
47 if (read(STDIN_FILENO
, &b
, 1) > 0)
52 static int cterm(void)
54 return tops
[ctag
] * NTAGS
+ ctag
;
57 static void term_switch(int oidx
, int nidx
, int show
, int save
, int load
)
59 int flags
= show
? (load
? TERM_REDRAW
: TERM_VISIBLE
) : TERM_HIDDEN
;
60 if (save
&& TERMOPEN(oidx
) && TERMSNAP(oidx
))
61 scr_snap(&terms
[oidx
]);
62 term_save(&terms
[oidx
]);
63 if (show
&& load
&& TERMOPEN(nidx
) && TERMSNAP(nidx
))
64 flags
= scr_load(&terms
[nidx
]) ? TERM_REDRAW
: TERM_VISIBLE
;
65 term_load(&terms
[nidx
], flags
);
68 static void showterm(int n
)
72 if (ctag
!= n
% NTAGS
)
74 term_switch(cterm(), n
, !hidden
, !hidden
, !hidden
);
76 tops
[ctag
] = n
/ NTAGS
;
79 static void showtag(int n
)
81 showterm(tops
[n
] * NTAGS
+ n
);
84 static struct term
*mainterm(void)
86 if (TERMOPEN(cterm()))
87 return &terms
[cterm()];
91 static void exec_cmd(char *file
)
97 static int altterm(int n
)
99 return n
< NTAGS
? n
+ NTAGS
: n
- NTAGS
;
102 static void nextterm(void)
104 int n
= (cterm() + 1) % NTERMS
;
105 while (n
!= cterm()) {
110 n
= (n
+ 1) % NTERMS
;
114 static void showtags(void)
116 int colors
[] = {15, 4, 2};
118 int r
= pad_rows() - 1;
120 pad_put('T', r
, c
++, FGCOLOR
, BGCOLOR
);
121 pad_put('A', r
, c
++, FGCOLOR
, BGCOLOR
);
122 pad_put('G', r
, c
++, FGCOLOR
, BGCOLOR
);
123 pad_put('S', r
, c
++, FGCOLOR
, BGCOLOR
);
124 pad_put(':', r
, c
++, FGCOLOR
, BGCOLOR
);
125 pad_put(' ', r
, c
++, FGCOLOR
, BGCOLOR
);
126 for (i
= 0; i
< NTAGS
; i
++) {
130 if (TERMOPEN(altterm(i
)))
132 pad_put(i
== ctag
? '(' : ' ', r
, c
++, FGCOLOR
, BGCOLOR
);
134 pad_put(tags
[i
], r
, c
++, !nt
? BGCOLOR
: colors
[nt
], 15);
136 pad_put(tags
[i
], r
, c
++, colors
[nt
], BGCOLOR
);
137 pad_put(i
== ctag
? ')' : ' ', r
, c
++, FGCOLOR
, BGCOLOR
);
141 static void directkey(void)
144 if (PASS
&& locked
) {
146 pass
[passlen
] = '\0';
147 if (!strcmp(PASS
, pass
))
152 if (isprint(c
) && passlen
+ 1 < sizeof(pass
))
157 switch ((c
= readchar())) {
169 showterm(altterm(cterm()));
187 term_switch(cterm(), cterm(), 1, 0, 1);
194 if (strchr(tags
, c
)) {
195 showtag(strchr(tags
, c
) - tags
);
202 if (c
!= -1 && mainterm())
206 static void temp_switch(int termid
)
208 if (termid
!= cterm())
209 term_switch(cterm(), termid
, 0, 0, 0);
212 static void switch_back(int termid
)
214 if (termid
!= cterm())
215 term_switch(termid
, cterm(), 1, 0, 0);
218 static int poll_all(void)
220 struct pollfd ufds
[NTERMS
+ 1];
221 int term_idx
[NTERMS
+ 1];
224 ufds
[0].fd
= STDIN_FILENO
;
225 ufds
[0].events
= POLLIN
;
226 for (i
= 0; i
< NTERMS
; i
++) {
228 ufds
[n
].fd
= terms
[i
].fd
;
229 ufds
[n
].events
= POLLIN
;
233 if (poll(ufds
, n
, 1000) < 1)
235 if (ufds
[0].revents
& BADPOLLFLAGS
)
237 if (ufds
[0].revents
& POLLIN
)
239 for (i
= 1; i
< n
; i
++) {
240 temp_switch(term_idx
[i
]);
241 if (ufds
[i
].revents
& POLLIN
)
243 if (ufds
[i
].revents
& BADPOLLFLAGS
) {
244 scr_free(&terms
[term_idx
[i
]]);
247 switch_back(term_idx
[i
]);
252 static void mainloop(void)
254 struct termios oldtermios
, termios
;
255 tcgetattr(STDIN_FILENO
, &termios
);
256 oldtermios
= termios
;
258 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, &termios
);
259 term_load(&terms
[cterm()], TERM_REDRAW
);
263 tcsetattr(STDIN_FILENO
, 0, &oldtermios
);
266 static void signalreceived(int n
);
267 static void signalregister(void)
269 signal(SIGUSR1
, signalreceived
);
270 signal(SIGUSR2
, signalreceived
);
271 signal(SIGCHLD
, signalreceived
);
274 static void signalreceived(int n
)
278 /* racy, new signals may arrive before re-registeration */
283 term_switch(cterm(), cterm(), 0, 1, 0);
284 ioctl(STDIN_FILENO
, VT_RELDISP
, 1);
289 term_switch(cterm(), cterm(), 1, 0, 1);
292 while (waitpid(-1, NULL
, WNOHANG
) > 0)
298 static void setupsignals(void)
301 vtm
.mode
= VT_PROCESS
;
303 vtm
.relsig
= SIGUSR1
;
304 vtm
.acqsig
= SIGUSR2
;
307 ioctl(STDIN_FILENO
, VT_SETMODE
, &vtm
);
312 char *hide
= "\x1b[?25l";
313 char *clear
= "\x1b[2J\x1b[H";
314 char *show
= "\x1b[?25h";
315 write(STDOUT_FILENO
, clear
, strlen(clear
));
316 write(STDIN_FILENO
, hide
, strlen(hide
));
320 fcntl(STDIN_FILENO
, F_SETFL
,
321 fcntl(STDIN_FILENO
, F_GETFL
) | O_NONBLOCK
);
325 write(STDIN_FILENO
, show
, strlen(show
));