Terminal doesn't work right after OS 10.15; must hit return 3 times.

Does this only affect your program running in Terminal? Or do you see the same problem in other command-line tools, like say openssl?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Only in terminal. But that's very important! In the procedure that handles terminal I/O I use fgetc, ungetc, getc, foef. Maybe something changed in their implementation?

I guess you need to add some debugging and see what those fgetc etc. calls actually receive.

I would suggest running under strace if that were available, is there something similar?

Are you checking for errors on all of those function calls?

Use of ungetc is interesting.

Do let us know what the problem was when you find it.

Only in terminal.

That’s not quite what I asked. Rather, I was asking whether your app is the only command-line tool that’s having this problem. If, for example, you run the openssl tool, does it also have the issue? In my setup, I ran this:

% openssl
OpenSSL> help
openssl:Error: 'help' is an invalid command.

…

and I only had to press Return once after typing help.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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openssl works fine; just hitting return once works. Evidently something changed in one of the utilities I use. As I wrote above: fgetc, ungetc, getc, foef. This is old code that still works fine in Linux.

openssl works fine; just hitting return once works.

OK, cool. I just want to make sure that there wasn’t a problem with your Terminal setup.

Evidently something changed in one of the utilities I use. As I wrote above: fgetc, ungetc, getc, feof.

That certainly does seem likely. Try pulling the command reading code out of your main program and into a tiny test tool. Does it exhibit the same behaviour?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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I worked around it. I put in some code that actually should have been there but never mattered. Now it fixed the problem. That still doesn't explain what happened to Terminal or some of the low level C-commands in OS 10.15. Thanks for your comments.