+
BUILD
+=====
+
- ./configure
- make
+
TODO
+====
+
- Maybe cleanup code checking boundaries, using max or other similar
macros or inline functions.
- When blinking and double-underline, the line doesn't blink.
yet but that it gracefully degrades to ASCII when French UTF-8 text
is displayed, at least for accents. More complete support would
be nice. Could use UCS-16 or UCS-32 internally.
-- BACKSPACE is sent as ^H and unlike for various keys like DELETE
- there is no ANSI control code. In top, the pid entry line editor,
- backspace doesn't work in analogterm but does in xterm. Determine
- why. Under xterm, stty reports two extra lines, one related to
- EOL2 and another one related to ^H so both could be related,
- termios(4) mentions ERASE. Also, wordgrinder expected a BACKSPACE
- event but received ^H, so the corresponding action needed to be
- rebound, otherwise it would report no binding for ^H.
- Also interesting, when in cat, under analogterm I get ^H for
- backspace, when it just works under xterm.
- stty -a shows even more info, including erase that is not bound
- to the same, ^? vs ^H.
- Update:
- Interestingly, if starting analogterm with -bs and then using
- stty erase ^H (default is otherwise ^?), backspace suddenly works
- under cat and top (but not under gnu top remotely).
- And the urxvt man page is interesting:
- Apparently sending the Delete terminal key sequence for the
- backspace key is common, along with sending the "execute" terminal
- code for the actual Delete key.
- And according to xterm man page, if backarrowKeyIsErase resource
- is on (on by default), it queries stty in order to determine what
- to send.
- Confirmed that the behavior is the same on Linux, needing -bs
- [>0c Secondary DA request (distinguishes VT240 from VT220)
Seems to not be supported by the current state system for >
https://www.real-world-systems.com/docs/ANSIcode.html
CONTROLS
+========
+
From the xanalogtv man page:
Notable X resources supported include the following which correspond to
standard TV controls: analogTVTint, analogTVColor, analogTVBrightness,
brightness way beyond 100 were it also increases thickness in
analogterminal.
-NTSC related
+
+NTSC
+====
+
https://web.archive.org/web/20050105095004/http://www.ee.washington.edu/conselec/CE/kuhn/ntsc/95x4.htm
https://web.archive.org/web/20050204191229fw_/http://www.ntsc-tv.com/ntsc-main-02.htm
https://en.wikipedia.org/wiki/NTSC#cite_note-11
oscillator."
https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Ntsc_channel.svg/800px-Ntsc_channel.svg.png
+
FONT
+====
+
https://retrocomputing.stackexchange.com/questions/17312/did-any-european-computers-use-10-line-fonts
"The Videx Videoterm 80 column card for the Apple II (very different
from the 80 column display on the Apple //e) used an 6845 that had
own EEPROM to get such a font."
-
VIM
+===
+
Vim can be told to not use color with :set t_Co=0 in which case it falls back
to attributes like bold/underline/inverse. However, some functionality is
lost. Unless t_Co=8 or over, :hi MatchParen cterm=underline for instance
designed for monochrome helps.
+STTY AND BS/DEL (BACKSPACE AND DELETE KEYS)
+===========================================
+
+stty -a can show the current settings.
+stty erase ^H may be used to explicitly set ERASE to BackSpace/bs.
+Among other things, xterm(1), like tset(1), define the ERASE and EOL2 keys
+using the current termcap/terminfo map (TERM=xterm in our case).
+
+Analogterm also sets those but explicitly to ^@ and ^H, respectively.
+It is possible that for some users ERASE should be ^? (del).
+By default, analogterm does not swap the BackSpace and Delete keys.
+It can be instructed to do so using the command line switch -del.
+
+A common symptom of wrong settings is a non-working BackSpace key. Sometimes
+it may generally work but not in all situations, like when in top(1)'s line
+editor, or under cat(1). Some applications may then also complain of an
+unbound ^H key, expecting another code like ^?.
+
+Additional related notes removed from TODO:
+ And the urxvt man page is interesting:
+ Apparently sending the Delete terminal key sequence for the
+ backspace key is common, along with sending the "execute" terminal
+ code for the actual Delete key.
+ And according to xterm man page, if backarrowKeyIsErase resource
+ is on (on by default), it queries stty in order to determine what
+ to send.
+
+
+THREADS AND SMP
+===============
+
+On some systems you may want to try -no-threads. The analogtv emulation uses
+SMP, but modern computers are so fast that disabling this may actually reduce
+CPU usage, avoiding unnecessary high-frequency synchronization.
+
+
USAGE EXAMPLES
+==============
+
+The default window size is 800x600. I commonly use 1364x1024.
+912x720 is approximately 12" 5/4 old display on a modern 24" monitor.
+
+Various examples:
hacks/analogterm -fast -geometry 1024x768 -program /bin/sh -tv-brightness 3 -tv-contrast 100
hacks/analogterm -fast -geometry 1024x768 -program /bin/sh -tv-brightness 0 -tv-contrast 70
hacks/analogterm -fast -geometry 1364x1024 -program /bin/sh -tv-color 10
+hacks/analogterm -fast -geometry 1364x1024 -program /bin/sh -tv-color 0 -tv-brightness 2 -tv-contrast 140 -del
-912x720 is approx 12" 5/4 old display on a modern 24" monitor.
-
-hacks/analogterm -fast -geometry 1364x1024 -program /bin/sh -tv-color 0
-hacks/analogterm -fast -geometry 1364x1024 -program /bin/sh -tv-color 0 -tv-brightness 2 -tv-contrast 140
-hacks/analogterm -fast -geometry 1364x1024 -program /bin/sh -tv-color 0 -tv-brightness 2 -tv-contrast 140 -del -bs
-
-hacks/analogterm -geometry 1364x1024 -bs
-stty erase ^H then often useful to set ERASE properly (to fix).
+Most used command by the author:
+hacks/analogterm -geometry 1364x1024 -no-threads
/* This is the child fork. */
char *av[10];
int i = 0;
+ struct termios tios;
if (putenv ("TERM=xterm"))
abort();
+
+ /*
+ * XXX Set client-side tty settings
+ * - tset(1) and xterm(1) can set the ERASE character to the
+ * termcap/terminfo entry in use. Since we simulate a subset of
+ * xterm, and that the terminfo definition uses ^H for it, we
+ * simply set it to that for now. Like xterm(1) does, we also set
+ * VEOL2.
+ */
+ if (tcgetattr(STDIN_FILENO, &tios) != -1) {
+ tios.c_lflag |= ICANON;
+ tios.c_cc[VERASE] = CTRL('h');
+ tios.c_cc[VEOL2] = CTRL('@');
+ if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &tios) == -1)
+ abort();
+ }
+
+ /* Start shell */
av[i++] = "/bin/sh";
av[i++] = "-c";
av[i++] = cmd;
* causes a freeze where ctrl-q cannot resume. With IXON this
* gets ignored. Ideally we'd want user-controlled xon/xoff to
* work properly.
- * It may also be possible to set ERASE here to match BS/DEL
- * settings.
*/
if (tcgetattr(fd, &tios) != -1) {
tios.c_iflag &= ~(BRKINT | INPCK | ISTRIP | IXON);
KeySym keysym;
unsigned char c = 0;
const char *send = NULL;
+ bool swapped = false;
XLookupString (k, (char *) &c, 1, &keysym, &d->compose);
* software like more/less. Thus it may not be worth it to use terminfo for
* now, or to use vt100 traditional codes.
*/
+ /* Swap BS/DEL if necessary */
+ if (d->swap_bs_del_p) {
+ if (keysym == XK_Delete) {
+ keysym = XK_BackSpace;
+ swapped = true;
+ }
+ else if (keysym == XK_BackSpace) {
+ keysym = XK_Delete;
+ swapped = true;
+ }
+ }
+
switch (keysym) {
case XK_Insert:
send = kv(k->state,
"\033[@", "\033[2;2~", "\033[2;5~", "\033[2;6~");
break;
+ case XK_BackSpace:
+ send = "\010"; /* "\b" */
+ break;
case XK_Delete:
send = kv(k->state,
"\033[3~", "\033[3;2~", "\033[3;5~", "\033[3;6~");
if (c != 0 && d->pipe)
{
- /* XXX May need to swap above in X11 key handling */
- if (!d->swap_bs_del_p) ;
+ /* Swap DEL/BS if necessary, avoid if already swapped above. */
+ if (!d->swap_bs_del_p || swapped) ;
else if (c == 127) c = 8;
else if (c == 8) c = 127;
Repositories / xscreensaver-5.35.git / commitdiff