From 102dc8aac8d04be7ec6ee030962f7a40dc6d9731 Mon Sep 17 00:00:00 2001 From: "Jiri Slaby (SUSE)" Date: Sun, 27 Aug 2023 09:41:40 +0200 Subject: tty: n_tty: move canon handling to a separate function n_tty_receive_char_special() is already complicated enough. Split the canon handling to a separate function: n_tty_receive_char_canon(). Signed-off-by: "Jiri Slaby (SUSE)" Link: https://lore.kernel.org/r/20230827074147.2287-8-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_tty.c | 158 +++++++++++++++++++++++++++++----------------------- 1 file changed, 87 insertions(+), 71 deletions(-) (limited to 'drivers/tty') diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 07b6a013b5ab..0149dc9dd0b1 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1262,6 +1262,91 @@ static bool n_tty_receive_char_flow_ctrl(struct tty_struct *tty, unsigned char c return true; } +static bool n_tty_receive_char_canon(struct tty_struct *tty, u8 c) +{ + struct n_tty_data *ldata = tty->disc_data; + + if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) || + (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) { + eraser(c, tty); + commit_echoes(tty); + + return true; + } + + if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) { + ldata->lnext = 1; + if (L_ECHO(tty)) { + finish_erasing(ldata); + if (L_ECHOCTL(tty)) { + echo_char_raw('^', ldata); + echo_char_raw('\b', ldata); + commit_echoes(tty); + } + } + + return true; + } + + if (c == REPRINT_CHAR(tty) && L_ECHO(tty) && L_IEXTEN(tty)) { + size_t tail = ldata->canon_head; + + finish_erasing(ldata); + echo_char(c, tty); + echo_char_raw('\n', ldata); + while (MASK(tail) != MASK(ldata->read_head)) { + echo_char(read_buf(ldata, tail), tty); + tail++; + } + commit_echoes(tty); + + return true; + } + + if (c == '\n') { + if (L_ECHO(tty) || L_ECHONL(tty)) { + echo_char_raw('\n', ldata); + commit_echoes(tty); + } + goto handle_newline; + } + + if (c == EOF_CHAR(tty)) { + c = __DISABLED_CHAR; + goto handle_newline; + } + + if ((c == EOL_CHAR(tty)) || + (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) { + /* + * XXX are EOL_CHAR and EOL2_CHAR echoed?!? + */ + if (L_ECHO(tty)) { + /* Record the column of first canon char. */ + if (ldata->canon_head == ldata->read_head) + echo_set_canon_col(ldata); + echo_char(c, tty); + commit_echoes(tty); + } + /* + * XXX does PARMRK doubling happen for + * EOL_CHAR and EOL2_CHAR? + */ + if (c == (unsigned char) '\377' && I_PARMRK(tty)) + put_tty_queue(c, ldata); + +handle_newline: + set_bit(MASK(ldata->read_head), ldata->read_flags); + put_tty_queue(c, ldata); + smp_store_release(&ldata->canon_head, ldata->read_head); + kill_fasync(&tty->fasync, SIGIO, POLL_IN); + wake_up_interruptible_poll(&tty->read_wait, EPOLLIN | EPOLLRDNORM); + return true; + } + + return false; +} + static void n_tty_receive_char_special(struct tty_struct *tty, unsigned char c, bool lookahead_done) { @@ -1296,77 +1381,8 @@ static void n_tty_receive_char_special(struct tty_struct *tty, unsigned char c, } else if (c == '\n' && I_INLCR(tty)) c = '\r'; - if (ldata->icanon) { - if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) || - (c == WERASE_CHAR(tty) && L_IEXTEN(tty))) { - eraser(c, tty); - commit_echoes(tty); - return; - } - if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) { - ldata->lnext = 1; - if (L_ECHO(tty)) { - finish_erasing(ldata); - if (L_ECHOCTL(tty)) { - echo_char_raw('^', ldata); - echo_char_raw('\b', ldata); - commit_echoes(tty); - } - } - return; - } - if (c == REPRINT_CHAR(tty) && L_ECHO(tty) && L_IEXTEN(tty)) { - size_t tail = ldata->canon_head; - - finish_erasing(ldata); - echo_char(c, tty); - echo_char_raw('\n', ldata); - while (MASK(tail) != MASK(ldata->read_head)) { - echo_char(read_buf(ldata, tail), tty); - tail++; - } - commit_echoes(tty); - return; - } - if (c == '\n') { - if (L_ECHO(tty) || L_ECHONL(tty)) { - echo_char_raw('\n', ldata); - commit_echoes(tty); - } - goto handle_newline; - } - if (c == EOF_CHAR(tty)) { - c = __DISABLED_CHAR; - goto handle_newline; - } - if ((c == EOL_CHAR(tty)) || - (c == EOL2_CHAR(tty) && L_IEXTEN(tty))) { - /* - * XXX are EOL_CHAR and EOL2_CHAR echoed?!? - */ - if (L_ECHO(tty)) { - /* Record the column of first canon char. */ - if (ldata->canon_head == ldata->read_head) - echo_set_canon_col(ldata); - echo_char(c, tty); - commit_echoes(tty); - } - /* - * XXX does PARMRK doubling happen for - * EOL_CHAR and EOL2_CHAR? - */ - if (c == (unsigned char) '\377' && I_PARMRK(tty)) - put_tty_queue(c, ldata); - -handle_newline: - set_bit(MASK(ldata->read_head), ldata->read_flags); - put_tty_queue(c, ldata); - smp_store_release(&ldata->canon_head, ldata->read_head); - kill_fasync(&tty->fasync, SIGIO, POLL_IN); - wake_up_interruptible_poll(&tty->read_wait, EPOLLIN | EPOLLRDNORM); - return; - } - } + if (ldata->icanon && n_tty_receive_char_canon(tty, c)) + return; if (L_ECHO(tty)) { finish_erasing(ldata); -- cgit v1.2.3