diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/lineedit.c | 21 | ||||
| -rw-r--r-- | libbb/xfuncs.c | 55 |
2 files changed, 45 insertions, 31 deletions
diff --git a/libbb/lineedit.c b/libbb/lineedit.c index 17766a126..3a092ffe2 100644 --- a/libbb/lineedit.c +++ b/libbb/lineedit.c @@ -2259,7 +2259,7 @@ static int32_t reverse_i_search(int timeout) */ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize) { - int len; + int len, n; int timeout; #if ENABLE_FEATURE_TAB_COMPLETION smallint lastWasTab = 0; @@ -2274,9 +2274,10 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman INIT_S(); - if (tcgetattr(STDIN_FILENO, &initial_settings) < 0 - || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON - ) { + n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0 + | TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */ + ); + if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) { /* Happens when e.g. stty -echo was run before. * But if ICANON is not set, we don't come here. * (example: interactive python ^Z-backgrounded, @@ -2329,18 +2330,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman #endif #define command command_must_not_be_used - new_settings = initial_settings; - /* ~ICANON: unbuffered input (most c_cc[] are disabled, VMIN/VTIME are enabled) */ - /* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */ - /* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */ - new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG); - /* reads will block only if < 1 char is available */ - new_settings.c_cc[VMIN] = 1; - /* no timeout (reads block forever) */ - new_settings.c_cc[VTIME] = 0; - /* Should be not needed if ISIG is off: */ - /* Turn off CTRL-C */ - /* new_settings.c_cc[VINTR] = _POSIX_VDISABLE; */ tcsetattr_stdin_TCSANOW(&new_settings); #if ENABLE_USERNAME_OR_HOMEDIR diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c index 1b3a1667b..d7647704e 100644 --- a/libbb/xfuncs.c +++ b/libbb/xfuncs.c @@ -311,40 +311,65 @@ int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp) return tcsetattr(STDIN_FILENO, TCSANOW, tp); } -int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags) +int FAST_FUNC get_termios_and_make_raw(int fd, struct termios *newterm, struct termios *oldterm, int flags) { -//TODO: lineedit, microcom, slattach, less might be adapted to use this too: -// grep for "tcsetattr" - - struct termios newterm; +//TODO: slattach, shell read might be adapted to use this too: grep for "tcsetattr", "[VTIME] = 0" + int r; - tcgetattr(fd, oldterm); - newterm = *oldterm; + memset(oldterm, 0, sizeof(*oldterm)); /* paranoia */ + r = tcgetattr(fd, oldterm); + *newterm = *oldterm; /* Turn off buffered input (ICANON) * Turn off echoing (ECHO) * and separate echoing of newline (ECHONL, normally off anyway) */ - newterm.c_lflag &= ~(ICANON | ECHO | ECHONL); + newterm->c_lflag &= ~(ICANON | ECHO | ECHONL); if (flags & TERMIOS_CLEAR_ISIG) { /* dont recognize INT/QUIT/SUSP chars */ - newterm.c_lflag &= ~ISIG; + newterm->c_lflag &= ~ISIG; } /* reads will block only if < 1 char is available */ - newterm.c_cc[VMIN] = 1; + newterm->c_cc[VMIN] = 1; /* no timeout (reads block forever) */ - newterm.c_cc[VTIME] = 0; + newterm->c_cc[VTIME] = 0; if (flags & TERMIOS_RAW_CRNL) { +/* IXON, IXOFF, and IXANY: + * IXOFF=1: sw flow control is enabled on input queue: + * tty transmits a STOP char when input queue is close to full + * and transmits a START char when input queue is nearly empty. + * IXON=1: sw flow control is enabled on output queue: + * tty will stop sending if STOP char is received, + * and resume sending if START is received, or if any char + * is received and IXANY=1. + */ + /* IXON=0: XON/XOFF chars are treated as normal chars (why we do this?) */ /* dont convert CR to NL on input */ - newterm.c_iflag &= ~(IXON | ICRNL); - /* dont convert NL to CR on output */ - newterm.c_oflag &= ~(ONLCR); + newterm->c_iflag &= ~(IXON | ICRNL); + /* dont convert NL to CR+NL on output */ + newterm->c_oflag &= ~(ONLCR); + /* Maybe clear more c_oflag bits? usually, only OPOST and ONLCR are set. + * OPOST Enable implementation-defined output processing (is this reqd for all other bits to work?) + * OLCUC Map lowercase characters to uppercase on output. + * OCRNL Map CR to NL on output. + * ONOCR Don't output CR at column 0. + * ONLRET Don't output CR. + */ } if (flags & TERMIOS_RAW_INPUT) { + /* IXOFF=0: disable sending XON/XOFF if input buf is full */ + /* IXON=0: XON/XOFF chars are treated as normal chars */ /* dont convert anything on input */ - newterm.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL); + newterm->c_iflag &= ~(IXOFF|IXON|IXANY|BRKINT|INLCR|ICRNL|IUCLC|IMAXBEL); } + return r; +} + +int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags) +{ + struct termios newterm; + get_termios_and_make_raw(fd, &newterm, oldterm, flags); return tcsetattr(fd, TCSANOW, &newterm); } |