Allow Syscons terminal emulators to provide function key strings.

xterm and cons25 have some incompatibilities when it comes to escape
sequences for special keys, such as F1 to F12, home, end, etc. Add a new
te_fkeystr() that can be used to override the strings.

scterm-sck won't do anything with this, but scterm-teken will use
teken_get_sequences() to obtain the proper sequence.

1 files changed, 69 insertions, 8 deletions

diff --git a/sys/teken/teken.c b/sys/teken/teken.c
index 81b8ac0..d50edc8 100644
--- a/sys/teken/teken.c
+++ b/sys/teken/teken.c
@@ -49,14 +49,15 @@ static FILE *df;
 #endif /* __FreeBSD__ && _KERNEL */
 
 /* Private flags for t_stateflags. */
-#define	TS_FIRSTDIGIT	0x01	/* First numeric digit in escape sequence. */
-#define	TS_INSERT	0x02	/* Insert mode. */
-#define	TS_AUTOWRAP	0x04	/* Autowrap. */
-#define	TS_ORIGIN	0x08	/* Origin mode. */
-#define	TS_WRAPPED	0x10	/* Next character should be printed on col 0. */
-#define	TS_8BIT		0x20	/* UTF-8 disabled. */
-#define	TS_CONS25	0x40	/* cons25 emulation. */
-#define	TS_INSTRING	0x80	/* Inside string. */
+#define	TS_FIRSTDIGIT	0x0001	/* First numeric digit in escape sequence. */
+#define	TS_INSERT	0x0002	/* Insert mode. */
+#define	TS_AUTOWRAP	0x0004	/* Autowrap. */
+#define	TS_ORIGIN	0x0008	/* Origin mode. */
+#define	TS_WRAPPED	0x0010	/* Next character should be printed on col 0. */
+#define	TS_8BIT		0x0020	/* UTF-8 disabled. */
+#define	TS_CONS25	0x0040	/* cons25 emulation. */
+#define	TS_INSTRING	0x0080	/* Inside string. */
+#define	TS_CURSORKEYS	0x0100	/* Cursor keys mode. */
 
 /* Character that blanks a cell. */
 #define	BLANK	' '
@@ -479,4 +480,64 @@ teken_256to8(teken_color_t c)
 	}
 }
 
+static const char * const special_strings_cons25[] = {
+	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
+	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
+
+	[TKEY_INSERT] = "\x1B[L",	[TKEY_DELETE] = "\x7F",
+	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
+	[TKEY_PAGE_UP] = "\x1B[I",	[TKEY_PAGE_DOWN] = "\x1B[G",
+
+	[TKEY_F1] = "\x1B[M",		[TKEY_F2] = "\x1B[N",
+	[TKEY_F3] = "\x1B[O",		[TKEY_F4] = "\x1B[P",
+	[TKEY_F5] = "\x1B[Q",		[TKEY_F6] = "\x1B[R",
+	[TKEY_F7] = "\x1B[S",		[TKEY_F8] = "\x1B[T",
+	[TKEY_F9] = "\x1B[U",		[TKEY_F10] = "\x1B[V",
+	[TKEY_F11] = "\x1B[W",		[TKEY_F12] = "\x1B[X",
+};
+
+static const char * const special_strings_ckeys[] = {
+	[TKEY_UP] = "\x1BOA",		[TKEY_DOWN] = "\x1BOB",
+	[TKEY_LEFT] = "\x1BOD",		[TKEY_RIGHT] = "\x1BOC",
+
+	[TKEY_HOME] = "\x1BOH",		[TKEY_END] = "\x1BOF",
+};
+
+static const char * const special_strings_normal[] = {
+	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
+	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
+
+	[TKEY_INSERT] = "\x1B[2~",	[TKEY_DELETE] = "\x1B[3~",
+	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
+	[TKEY_PAGE_UP] = "\x1B[5~",	[TKEY_PAGE_DOWN] = "\x1B[6~",
+
+	[TKEY_F1] = "\x1BOP",		[TKEY_F2] = "\x1BOQ",
+	[TKEY_F3] = "\x1BOR",		[TKEY_F4] = "\x1BOS",
+	[TKEY_F5] = "\x1B[15~",		[TKEY_F6] = "\x1B[17~",
+	[TKEY_F7] = "\x1B[18~",		[TKEY_F8] = "\x1B[19~",
+	[TKEY_F9] = "\x1B[20~",		[TKEY_F10] = "\x1B[21~",
+	[TKEY_F11] = "\x1B[23~",	[TKEY_F12] = "\x1B[24~",
+};
+
+const char *
+teken_get_sequence(teken_t *t, unsigned int k)
+{
+
+	/* Cons25 mode. */
+	if (t->t_stateflags & TS_CONS25 &&
+	    k < sizeof special_strings_cons25 / sizeof(char *))
+		return (special_strings_cons25[k]);
+
+	/* Cursor keys mode. */
+	if (t->t_stateflags & TS_CURSORKEYS &&
+	    k < sizeof special_strings_ckeys / sizeof(char *))
+		return (special_strings_ckeys[k]);
+
+	/* Default xterm sequences. */
+	if (k < sizeof special_strings_normal / sizeof(char *))
+		return (special_strings_normal[k]);
+	
+	return (NULL);
+}
+
 #include "teken_state.h"