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Bug 994: Treat only termios.c_cc[VERASE] as "Backspace".

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When setting the tty device to raw mode, save the VERASE character.
Later, compare incoming bytes to that.

This is somewhat complicated because "stty verase undef"
sets termios.c_cc[VERASE] = _POSIX_VDISABLE, and e.g. Linux
defines _POSIX_VDISABLE as 0 but that must not cause ELinks
to treat incoming null bytes as backspaces.  Furthermore,
some systems may use different VDISABLE values for different
terminal devices, in which case _POSIX_VDISABLE is undefined
and ELinks must instead read the value from fpathconf().
This commit is contained in:
Kalle Olavi Niemitalo 2008-01-13 23:49:31 +02:00 committed by Kalle Olavi Niemitalo
parent 1faf589e90
commit 49ea10a74d
3 changed files with 33 additions and 25 deletions
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1
NEWS
View File

@ -119,6 +119,7 @@ Miscellaneous:
and on BSD via moused -z 4
* enhancement: 24-bit truecolor mode
* enhancement 622: -dump-color-mode
* enhancement 994: treat only termios.c_cc[VERASE] as "Backspace"
* enhancement: support Ctrl+Alt+letter key combinations
* enhancement 381: reduce memory consumption of codepages and some
other arrays

1
src/terminal/itrm.h
View File

@ -100,6 +100,7 @@ struct itrm {
void *mouse_h; /**< Mouse handle */
unsigned char *orig_title; /**< For restoring window title */
int verase; /**< Byte to map to KBD_BS, or -1 */
unsigned int blocked:1; /**< Whether it was blocked */
unsigned int altscreen:1; /**< Whether to use alternate screen */
unsigned int touched_title:1; /**< Whether the term title was changed */

56
src/terminal/kbd.c
View File

@ -224,14 +224,25 @@ get_terminal_name(unsigned char name[MAX_TERM_LEN])
static int
setraw(int fd, struct termios *p)
setraw(struct itrm *itrm, int save_orig)
{
struct termios t;
long vdisable;
memset(&t, 0, sizeof(t));
if (tcgetattr(fd, &t)) return -1;
if (tcgetattr(itrm->in.ctl, &t)) return -1;
if (p) copy_struct(p, &t);
if (save_orig) copy_struct(&itrm->t, &t);
#ifdef _POSIX_VDISABLE
vdisable = _POSIX_VDISABLE;
#else
vdisable = fpathconf(itrm->in.ctl, _PC_VDISABLE);
#endif
if (vdisable != -1 && t.c_cc[VERASE] == vdisable)
itrm->verase = -1;
else
itrm->verase = (unsigned char) t.c_cc[VERASE];
elinks_cfmakeraw(&t);
t.c_lflag |= ISIG;
@ -239,7 +250,7 @@ setraw(int fd, struct termios *p)
t.c_lflag |= TOSTOP;
#endif
t.c_oflag |= OPOST;
if (tcsetattr(fd, TCSANOW, &t)) return -1;
if (tcsetattr(itrm->in.ctl, TCSANOW, &t)) return -1;
return 0;
}
@ -319,7 +330,7 @@ handle_trm(int std_in, int std_out, int sock_in, int sock_out, int ctl_in,
itrm->altscreen = 1;
if (!remote) {
if (ctl_in >= 0) setraw(ctl_in, &itrm->t);
if (ctl_in >= 0) setraw(itrm, 1);
send_init_sequence(std_out, itrm->altscreen);
handle_terminal_resize(ctl_in, resize_terminal);
#ifdef CONFIG_MOUSE
@ -364,7 +375,7 @@ unblock_itrm(void)
{
if (!ditrm) return -1;
if (ditrm->in.ctl >= 0 && setraw(ditrm->in.ctl, NULL)) return -1;
if (ditrm->in.ctl >= 0 && setraw(ditrm, 0)) return -1;
ditrm->blocked = 0;
send_init_sequence(ditrm->out.std, ditrm->altscreen);
@ -937,26 +948,18 @@ decode_terminal_application_key(struct itrm *itrm, struct interlink_event *ev)
/** Initialize @a *ev to match the byte @a key received from the terminal.
* @a key must not be a value from enum term_event_special_key. */
static void
set_kbd_event(struct interlink_event *ev,
set_kbd_event(const struct itrm *itrm, struct interlink_event *ev,
int key, term_event_modifier_T modifier)
{
switch (key) {
if (key == itrm->verase)
key = KBD_BS;
else switch (key) {
case ASCII_TAB:
key = KBD_TAB;
break;
#if defined(HAVE_SYS_CONSIO_H) || defined(HAVE_MACHINE_CONSOLE_H) /* BSD */
case ASCII_BS:
key = KBD_BS;
break;
case ASCII_DEL:
case ASCII_DEL: /* often overridden by itrm->verase above */
key = KBD_DEL;
break;
#else
case ASCII_BS:
case ASCII_DEL:
key = KBD_BS;
break;
#endif
case ASCII_LF:
case ASCII_CR:
key = KBD_ENTER;
@ -966,6 +969,7 @@ set_kbd_event(struct interlink_event *ev,
key = KBD_ESC;
break;
case ASCII_BS: /* often overridden by itrm->verase above */
default:
if (key < ' ') {
key += 'A' - 1;
@ -998,10 +1002,10 @@ kbd_timeout(struct itrm *itrm)
if (itrm->in.queue.len >= 2 && itrm->in.queue.data[0] == ASCII_ESC) {
/* This is used for ESC [ and ESC O. */
set_kbd_event(&ev, itrm->in.queue.data[1], KBD_MOD_ALT);
set_kbd_event(itrm, &ev, itrm->in.queue.data[1], KBD_MOD_ALT);
el = 2;
} else {
set_kbd_event(&ev, itrm->in.queue.data[0], KBD_MOD_NONE);
set_kbd_event(itrm, &ev, itrm->in.queue.data[0], KBD_MOD_NONE);
el = 1;
}
itrm_queue_event(itrm, (char *) &ev, sizeof(ev));
@ -1085,20 +1089,22 @@ process_queue(struct itrm *itrm)
* by an escape sequence. Treat it as
* a standalone Esc. */
el = 1;
set_kbd_event(&ev, itrm->in.queue.data[0],
set_kbd_event(itrm, &ev,
itrm->in.queue.data[0],
KBD_MOD_NONE);
} else {
/* The second ESC of ESC ESC is not the
* beginning of any known escape sequence.
* This must be Alt-Esc, then. */
el = 2;
set_kbd_event(&ev, itrm->in.queue.data[1],
set_kbd_event(itrm, &ev,
itrm->in.queue.data[1],
KBD_MOD_ALT);
}
}
if (el == 0) { /* Begins with ESC, but none of the above */
el = 2;
set_kbd_event(&ev, itrm->in.queue.data[1],
set_kbd_event(itrm, &ev, itrm->in.queue.data[1],
KBD_MOD_ALT);
}
@ -1119,7 +1125,7 @@ process_queue(struct itrm *itrm)
if (el == 0) {
el = 1;
set_kbd_event(&ev, itrm->in.queue.data[0], KBD_MOD_NONE);
set_kbd_event(itrm, &ev, itrm->in.queue.data[0], KBD_MOD_NONE);
}
/* The call to decode_terminal_escape_sequence() might have changed the