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libbb: consolidate the code to set termios unbuffered mode

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function                                             old     new   delta
set_termios_to_raw                                     -     116    +116
count_lines                                           72      74      +2
powertop_main                                       1458    1430     -28
top_main                                             943     914     -29
more_main                                            759     714     -45
fsck_minix_main                                     2969    2921     -48
conspy_main                                         1197    1135     -62
rawmode                                               99      36     -63
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/6 up/down: 118/-275)         Total: -157 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2017-01-11 16:17:59 +01:00
parent 8944c67b1f
commit 01ccdd1d3c
15 changed files with 71 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
libbb/lineedit.c
View File

@@ -2325,7 +2325,7 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
/* ~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 would block only if < 1 char is available */
/* 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;

37
libbb/xfuncs.c
View File

@@ -311,6 +311,43 @@ 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)
{
//TODO: lineedit, microcom and less might be adapted to use this too:
// grep for "tcsetattr"
struct termios newterm;
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);
if (flags & TERMIOS_CLEAR_ISIG) {
/* dont recognize INT/QUIT/SUSP chars */
newterm.c_lflag &= ~ISIG;
}
/* reads will block only if < 1 char is available */
newterm.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
newterm.c_cc[VTIME] = 0;
if (flags & TERMIOS_RAW_CRNL) {
/* dont convert CR to NL on input */
newterm.c_iflag &= ~(IXON | ICRNL);
/* dont convert NL to CR on output */
newterm.c_oflag &= ~(ONLCR);
}
if (flags & TERMIOS_RAW_INPUT) {
/* dont convert anything on input */
newterm.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
}
return tcsetattr(fd, TCSANOW, &newterm);
}
pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
{
pid_t r;