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Recognise extended key sequences on input (both the forms xterm offers).

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This commit is contained in:
Nicholas Marriott 2020-05-15 11:09:32 +01:00
parent 5ee4d991b6
commit e95b644139
1 changed files with 103 additions and 0 deletions
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103
tty-keys.c
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@ -21,6 +21,7 @@
#include <netinet/in.h>
#include <ctype.h>
#include <limits.h>
#include <resolv.h>
#include <stdlib.h>
@ -46,6 +47,8 @@ static struct tty_key *tty_keys_find(struct tty *, const char *, size_t,
static int tty_keys_next1(struct tty *, const char *, size_t, key_code *,
size_t *, int);
static void tty_keys_callback(int, short, void *);
static int tty_keys_extended_key(struct tty *, const char *, size_t,
size_t *, key_code *);
static int tty_keys_mouse(struct tty *, const char *, size_t, size_t *,
struct mouse_event *);
static int tty_keys_clipboard(struct tty *, const char *, size_t,
@ -690,6 +693,16 @@ tty_keys_next(struct tty *tty)
goto partial_key;
}
/* Is this an extended key press? */
switch (tty_keys_extended_key(tty, buf, len, &size, &key)) {
case 0: /* yes */
goto complete_key;
case -1: /* no, or not valid */
break;
case 1: /* partial */
goto partial_key;
}
first_key:
/* Try to lookup complete key. */
n = tty_keys_next1(tty, buf, len, &key, &size, expired);
@ -827,6 +840,96 @@ tty_keys_callback(__unused int fd, __unused short events, void *data)
}
}
/*
* Handle extended key input. This has two forms: \033[27;m;k~ and \033[k;mu,
* where k is key as a number and m is a modifier. Returns 0 for success, -1
* for failure, 1 for partial;
*/
static int
tty_keys_extended_key(struct tty *tty, const char *buf, size_t len,
size_t *size, key_code *key)
{
struct client *c = tty->client;
size_t end;
u_int number, modifiers;
char tmp[64];
*size = 0;
/* First two bytes are always \033[. */
if (buf[0] != '\033')
return (-1);
if (len == 1)
return (1);
if (buf[1] != '[')
return (-1);
if (len == 2)
return (1);
/*
* Look for a terminator. Stop at either '~' or anything that isn't a
* number or ';'.
*/
for (end = 2; end < len && end != sizeof tmp; end++) {
if (buf[end] == '~')
break;
if (!isdigit((u_char)buf[end]) && buf[end] != ';')
break;
}
if (end == len)
return (1);
if (buf[end] != '~' && buf[end] != 'u')
return (-1);
/* Copy to the buffer. */
memcpy(tmp, buf + 2, end);
tmp[end] = '\0';
/* Try to parse either form of key. */
if (buf[end] == '~') {
if (sscanf(tmp, "27;%u;%u", &modifiers, &number) != 2)
return (-1);
} else {
if (sscanf(tmp ,"%u;%u", &number, &modifiers) != 2)
return (-1);
}
*size = end + 1;
/* Store the key and modifiers. */
*key = number|KEYC_XTERM;
switch (modifiers) {
case 2:
(*key) |= KEYC_SHIFT;
break;
case 3:
(*key) |= KEYC_ESCAPE;
break;
case 4:
(*key) |= (KEYC_SHIFT|KEYC_ESCAPE);
break;
case 5:
(*key) |= KEYC_CTRL;
break;
case 6:
(*key) |= (KEYC_SHIFT|KEYC_CTRL);
break;
case 7:
(*key) |= (KEYC_ESCAPE|KEYC_CTRL);
break;
case 8:
(*key) |= (KEYC_SHIFT|KEYC_ESCAPE|KEYC_CTRL);
break;
default:
*key = KEYC_NONE;
break;
}
if (log_get_level() != 0) {
log_debug("%s: extended key %.*s is %llx (%s)", c->name,
(int)*size, buf, *key, key_string_lookup_key(*key));
}
return (0);
}
/*
* Handle mouse key input. Returns 0 for success, -1 for failure, 1 for partial
* (probably a mouse sequence but need more data).