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tty: vt: define an enum for ascii characters 

I didn't find definitions for ascii in the kernel yet, so define it for
non-printable characters used here.

Note we use ' ' instead of 32 on one line too.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Tested-by: Helge Deller <deller@gmx.de> # parisc STI console
Link: https://lore.kernel.org/r/20240122110401.7289-18-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2024-01-22 12:03:31 +01:00 committed by Greg Kroah-Hartman
parent 23672a572f
commit bf9e206b8a
1 changed files with 44 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/tty/vt/vt.c
View File

@ -2143,6 +2143,28 @@ static bool ansi_control_string(unsigned int state)
return false;
}
enum {
ASCII_NULL = 0,
ASCII_BELL = 7,
ASCII_BACKSPACE = 8,
ASCII_IGNORE_FIRST = ASCII_BACKSPACE,
ASCII_HTAB = 9,
ASCII_LINEFEED = 10,
ASCII_VTAB = 11,
ASCII_FORMFEED = 12,
ASCII_CAR_RET = 13,
ASCII_IGNORE_LAST = ASCII_CAR_RET,
ASCII_SHIFTOUT = 14,
ASCII_SHIFTIN = 15,
ASCII_CANCEL = 24,
ASCII_SUBSTITUTE = 26,
ASCII_ESCAPE = 27,
ASCII_CSI_IGNORE_FIRST = ' ', /* 0x2x, 0x3a and 0x3c - 0x3f */
ASCII_CSI_IGNORE_LAST = '?',
ASCII_DEL = 127,
ASCII_EXT_CSI = 128 + ASCII_ESCAPE,
};
/* console_lock is held */
static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
{
@ -2150,21 +2172,22 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
* Control characters can be used in the _middle_
* of an escape sequence, aside from ANSI control strings.
*/
if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
if (ansi_control_string(vc->vc_state) && c >= ASCII_IGNORE_FIRST &&
c <= ASCII_IGNORE_LAST)
return;
switch (c) {
case 0:
case ASCII_NULL:
return;
case 7:
case ASCII_BELL:
if (ansi_control_string(vc->vc_state))
vc->vc_state = ESnormal;
else if (vc->vc_bell_duration)
kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
return;
case 8:
case ASCII_BACKSPACE:
bs(vc);
return;
case 9:
case ASCII_HTAB:
vc->vc_pos -= (vc->state.x << 1);
vc->state.x = find_next_bit(vc->vc_tab_stop,
@ -2176,34 +2199,37 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
vc->vc_pos += (vc->state.x << 1);
notify_write(vc, '\t');
return;
case 10: case 11: case 12:
case ASCII_LINEFEED:
case ASCII_VTAB:
case ASCII_FORMFEED:
lf(vc);
if (!is_kbd(vc, lnm))
return;
fallthrough;
case 13:
case ASCII_CAR_RET:
cr(vc);
return;
case 14:
case ASCII_SHIFTOUT:
vc->state.charset = 1;
vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
vc->vc_disp_ctrl = 1;
return;
case 15:
case ASCII_SHIFTIN:
vc->state.charset = 0;
vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
vc->vc_disp_ctrl = 0;
return;
case 24: case 26:
case ASCII_CANCEL:
case ASCII_SUBSTITUTE:
vc->vc_state = ESnormal;
return;
case 27:
case ASCII_ESCAPE:
vc->vc_state = ESesc;
return;
case 127:
case ASCII_DEL:
del(vc);
return;
case 128+27:
case ASCII_EXT_CSI:
vc->vc_state = ESsquare;
return;
}
@ -2338,7 +2364,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
vc->vc_par[vc->vc_npar] += c - '0';
return;
}
if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST) {
vc->vc_state = EScsiignore;
return;
}
@ -2500,7 +2526,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
}
return;
case EScsiignore:
if (c >= 0x20 && c <= 0x3f)
if (c >= ASCII_CSI_IGNORE_FIRST && c <= ASCII_CSI_IGNORE_LAST)
return;
vc->vc_state = ESnormal;
return;
@ -2761,17 +2787,17 @@ static bool vc_is_control(struct vc_data *vc, int tc, int c)
* useless without them; to display an arbitrary font position use the
* direct-to-font zone in UTF-8 mode.
*/
if (c < 32) {
if (c < ' ') {
if (vc->vc_disp_ctrl)
return CTRL_ALWAYS & BIT(c);
else
return vc->vc_utf || (CTRL_ACTION & BIT(c));
}
if (c == 127 && !vc->vc_disp_ctrl)
if (c == ASCII_DEL && !vc->vc_disp_ctrl)
return true;
if (c == 128 + 27)
if (c == ASCII_EXT_CSI)
return true;
return false;