Figuring out what exactly happens in get_key_code() when user
uses various function keys is not trivial.
While working on some fixes, I added a debugging code
which records a log in /tmp/mc_key.log; I would like
to save future developers from doing this again.
This patch adds my debugging code, disabled via "#if 0".
Signed-off-by: Denys Vlasenko <vda.li...@googlemail.com>
---
lib/tty/key.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/lib/tty/key.c b/lib/tty/key.c
index d2142fa..33732db 100644
--- a/lib/tty/key.c
+++ b/lib/tty/key.c
@@ -1811,6 +1811,34 @@ is_idle (void)
}
/*
---------------------------------------------------------------------------------------------
*/
+#if 0
+# define key_debug 1
+static void keylog (const char *fmt, ...)
+{
+ static int logfd = -1;
+
+ if (logfd < 0) {
+ logfd = open ("/tmp/mc_key.log", O_CREAT | O_WRONLY | O_APPEND, 0666);
+ if (logfd < 0)
+ return;
+ }
+
+ va_list ap;
+ va_start (ap, fmt);
+ char *p = NULL;
+ vasprintf (&p, fmt, ap);
+ va_end (ap);
+
+ if (p)
+ {
+ write (logfd, p, strlen(p));
+ free (p);
+ }
+}
+#else
+# define key_debug 0
+# define keylog(...) ((void)0)
+#endif
int
get_key_code (int no_delay)
@@ -1820,6 +1848,8 @@ get_key_code (int no_delay)
static struct timeval esctime = { -1, -1 };
static int lastnodelay = -1;
+ keylog ("entered %s(no_delay:%d)\n", __func__, no_delay);
+
if (no_delay != lastnodelay)
{
this = NULL;
@@ -1832,15 +1862,18 @@ get_key_code (int no_delay)
int m;
m = parse_extended_mouse_coordinates ();
+ keylog (" pending_keys!=NULL. m=%d\n", m);
if (m == 1)
{
pending_keys = seq_append = NULL;
this = NULL;
+ keylog ("return MCKEY_EXTENDED_MOUSE\n");
return MCKEY_EXTENDED_MOUSE;
}
if (m == -1)
{
int d = *pending_keys++;
+ keylog (" d=*pending_keys++=%d\n", d);
check_pend:
if (*pending_keys == 0)
{
@@ -1850,11 +1883,16 @@ get_key_code (int no_delay)
else if (d == ESC_CHAR)
{
d = ALT (*pending_keys++);
+ keylog (" d=ALT(*pending_keys++)=ALT(%d)=%d\n",
pending_keys[-1], d);
goto check_pend;
}
if ((d > 127 && d < 256) && use_8th_bit_as_meta)
+ {
d = ALT (d & 0x7f);
+ keylog (" d=ALT(d & 0x7f)=ALT(%d)=%d\n", d & 0x7f, d);
+ }
this = NULL;
+ keylog ("return correct_key_code(%d)\n", d);
return correct_key_code (d);
}
/* else if (m == 0), just let it continue */
@@ -1865,6 +1903,7 @@ get_key_code (int no_delay)
tty_nodelay (TRUE);
c = tty_lowlevel_getch ();
+ keylog (" c=tty_lowlevel_getch()=%d\n", c);
#if (defined(USE_NCURSES) || defined(USE_NCURSESW)) && defined(KEY_RESIZE)
if (c == KEY_RESIZE)
goto nodelay_try_again;
@@ -1941,15 +1980,18 @@ get_key_code (int no_delay)
pending_keys = seq_append = NULL;
code = this->code;
this = NULL;
+ keylog ("2 return correct_key_code(%d)\n", code);
return correct_key_code (code);
}
/* No match yet, but it may be a prefix for a valid seq */
if (!push_char (c))
{
+ keylog (" push_char(%d) failure (no more space)\n", c);
pending_keys = seq_buffer;
goto pend_send;
}
+ keylog (" push_char(%d) ok\n", c);
parent = this;
this = this->child;
if (parent->action == MCKEY_ESCAPE && old_esc_mode)
@@ -1967,10 +2009,12 @@ get_key_code (int no_delay)
}
esctime.tv_sec = -1;
c = xgetch_second ();
+ keylog (" c=xgetch_second()=%d\n", c);
if (c == -1)
{
pending_keys = seq_append = NULL;
this = NULL;
+ keylog ("return ESC_CHAR\n");
return ESC_CHAR;
}
continue;
@@ -1978,6 +2022,7 @@ get_key_code (int no_delay)
if (no_delay)
goto nodelay_try_again;
c = tty_lowlevel_getch ();
+ keylog (" 2 c=tty_lowlevel_getch()=%d\n", c);
continue;
}
@@ -2000,17 +2045,27 @@ get_key_code (int no_delay)
pending_keys = seq_append = NULL;
this = NULL;
+ keylog ("3 return correct_key_code(%d)\n", c);
return correct_key_code (c);
}
/* Unknown sequence. Maybe a prefix of a longer one. Save it. */
+ keylog (" push_char(%d)\n", c);
push_char (c);
+ if (key_debug)
+ {
+ int i = 0;
+ do
+ keylog (" seq_buffer[%d]:%d\n", i, seq_buffer[i]);
+ while (seq_buffer[i++]);
+ }
pending_keys = seq_buffer;
goto pend_send;
} /* while (this != NULL) */
this = NULL;
+ keylog ("4 return correct_key_code(%d)\n", c);
return correct_key_code (c);
}
--
1.7.7.6
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