yangsong8-a1 opened a new pull request, #21158:
URL: https://github.com/apache/nuttx/pull/21158
## Summary
pty_write() performed OPOST output one byte at a time, issuing a
separate file_write() to the sink pipe for every character. Use
memchr to locate the next byte that needs translation or that is a
tty control character, then write the run of ordinary bytes before
it to the sink in a single call.
## Impact
Much fewer pipe writes for PTY output. Return value now is the
correct byte count.
## Testing
use adb shell do the following test:
CR/LF : Input is normal; output is complete, with proper line breaks.
```
ap> ls -lR
/:
dr-xr-xr-x 0 0 0 0 audio_image/
dr-xr-xr-x 0 0 0 0 cp_image/
drwxrwxrwx 0 0 0 0 data/
drwxrwxrwx 1 0 0 0 dev/
dr-xr-xr-x 0 0 0 0 etc/
...
```
Ctrl-C / Ctrl-Z:
```
ap> ping -c 1000 127.0.0.1
```
Press Ctrl-C while `ping` is running: `ping` stops immediately.
Run it again; press Ctrl-Z, then use `ps` to verify that it is in the
"stopped" state.
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