@@ -2091,9 +2091,44 @@ static void restore_cur(struct vc_data *vc)
vc->vc_need_wrap = 0;
}
-enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
- EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
- ESpalette, ESosc, ESapc, ESpm, ESdcs };
+/**
+ * enum vc_ctl_state - control characters state of a vt
+ *
+ * @ESnormal: initial state, no control characters parsed
+ * @ESesc: ESC parsed
+ * @ESsquare: CSI parsed -- modifiers/parameters/ctrl chars expected
+ * @ESgetpars: CSI parsed -- parameters/ctrl chars expected
+ * @ESfunckey: CSI [ parsed
+ * @EShash: ESC # parsed
+ * @ESsetG0: ESC ( parsed
+ * @ESsetG1: ESC ) parsed
+ * @ESpercent: ESC % parsed
+ * @EScsiignore: CSI [0x20-0x3f] parsed
+ * @ESnonstd: OSC parsed
+ * @ESpalette: OSC P parsed
+ * @ESosc: OSC [0-9] parsed
+ * @ESapc: ESC _ parsed
+ * @ESpm: ESC ^ parsed
+ * @ESdcs: ESC P parsed
+ */
+enum vc_ctl_state {
+ ESnormal,
+ ESesc,
+ ESsquare,
+ ESgetpars,
+ ESfunckey,
+ EShash,
+ ESsetG0,
+ ESsetG1,
+ ESpercent,
+ EScsiignore,
+ ESnonstd,
+ ESpalette,
+ ESosc,
+ ESapc,
+ ESpm,
+ ESdcs,
+};
/* console_lock is held (except via vc_init()) */
static void reset_terminal(struct vc_data *vc, int do_clear)
@@ -2527,10 +2562,10 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
return;
switch(vc->vc_state) {
- case ESesc:
+ case ESesc: /* ESC */
handle_esc(tty, vc, c);
return;
- case ESnonstd:
+ case ESnonstd: /* ESC ] aka OSC */
if (c=='P') { /* palette escape sequence */
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
@@ -2545,7 +2580,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
else
vc->vc_state = ESnormal;
return;
- case ESpalette:
+ case ESpalette: /* ESC ] P aka OSC P */
if (isxdigit(c)) {
vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
if (vc->vc_npar == 7) {
@@ -2562,7 +2597,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
} else
vc->vc_state = ESnormal;
return;
- case ESsquare:
+ case ESsquare: /* ESC [ aka CSI, parameters or modifiers expected */
for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
vc->vc_par[vc->vc_npar] = 0;
vc->vc_npar = 0;
@@ -2587,7 +2622,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
}
vc->vc_priv = EPecma;
fallthrough;
- case ESgetpars:
+ case ESgetpars: /* ESC [ aka CSI, parameters expected */
if (c == ';' && vc->vc_npar < NPAR - 1) {
vc->vc_npar++;
return;
@@ -2600,6 +2635,9 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
vc->vc_state = EScsiignore;
return;
}
+
+ /* parameters done, handle the control char @c */
+
vc->vc_state = ESnormal;
switch (vc->vc_priv) {
@@ -2617,7 +2655,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
return;
vc->vc_state = ESnormal;
return;
- case ESpercent:
+ case ESpercent: /* ESC % */
vc->vc_state = ESnormal;
switch (c) {
case '@': /* defined in ISO 2022 */
@@ -2629,10 +2667,10 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
return;
}
return;
- case ESfunckey:
+ case ESfunckey: /* ESC [ [ aka CSI [ */
vc->vc_state = ESnormal;
return;
- case EShash:
+ case EShash: /* ESC # */
vc->vc_state = ESnormal;
if (c == '8') {
/* DEC screen alignment test. kludge :-) */
@@ -2644,21 +2682,21 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, u8 c)
do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
}
return;
- case ESsetG0:
+ case ESsetG0: /* ESC ( */
vc_setGx(vc, 0, c);
vc->vc_state = ESnormal;
return;
- case ESsetG1:
+ case ESsetG1: /* ESC ) */
vc_setGx(vc, 1, c);
vc->vc_state = ESnormal;
return;
- case ESapc:
+ case ESapc: /* ESC _ */
return;
- case ESosc:
+ case ESosc: /* ESC ] [0-9] aka OSC [0-9] */
return;
- case ESpm:
+ case ESpm: /* ESC ^ */
return;
- case ESdcs:
+ case ESdcs: /* ESC P */
return;
default:
vc->vc_state = ESnormal;
The enum for states is currently compact and undocumented. Put each definition on a separate line and document them all using kernel-doc. Document the same on the use sites. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> --- drivers/tty/vt/vt.c | 72 ++++++++++++++++++++++++++++++++++----------- 1 file changed, 55 insertions(+), 17 deletions(-)