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| Strange input glitch https://forum.osdev.org/viewtopic.php?f=1&t=32516 |
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| Author: | nm111 [ Thu Oct 26, 2017 11:18 am ] |
| Post subject: | Strange input glitch |
So, I have been trying to make an OS, but a glitch is getting in my way. When I type a command, sometimes the argument gets blanked out or replaced. I have no idea about where this glitch is happening, but it seems to occur more often when backspaces are used. So for example: Code: >echo Hello Hello >echo Hello Heloo >echo Hello (nothing) I am pretty sure this has nothing to do with my string-splitting routine, as that works pretty well in as a normal C program. Does anyone have any help? (OS is on https://github.com/nm111/NMOS) |
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| Author: | zaval [ Thu Oct 26, 2017 1:59 pm ] |
| Post subject: | Re: Strange input glitch |
nm111 wrote: So, ... Does anyone have any help? ... moronic signature wrote: _________________ Person: "How do I compile this on Windows?" Me: "Don't use Windows." 
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| Author: | iansjack [ Thu Oct 26, 2017 2:55 pm ] |
| Post subject: | Re: Strange input glitch |
Perhaps I'm missing something, but I can't see where you define your getChar() and printf() functions. As per the previous post, slagging off a particular operating system just makes you look like a kid trying (unsuccessfully) to be cool. |
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| Author: | Octacone [ Thu Oct 26, 2017 3:10 pm ] |
| Post subject: | Re: Strange input glitch |
iansjack wrote: Perhaps I'm missing something, but I can't see where you define your getChar() and printf() functions. As per the previous post, slagging off a particular operating system just makes you look like a kid trying (unsuccessfully) to be cool. I managed to find those... Inside the headers... |
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| Author: | thepowersgang [ Thu Oct 26, 2017 10:36 pm ] |
| Post subject: | Re: Strange input glitch |
At a quick guess, this is caused by bad rendering (either printing or scrolling). With that said - Your code organisation has a lot of issues (non-inline code shouldn't be in headers, printf shouldn't deviate from the standard, indentation is pretty inconsistent, ...) I suggest adding in a logging function (e.g. something like `void logf(const char*, ...);` that acts like printf) that writes to the first serial port and using that to debug your rendering issues (by logging the various values before you use them). |
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| Author: | iansjack [ Fri Oct 27, 2017 12:37 am ] |
| Post subject: | Re: Strange input glitch |
Octacone wrote: iansjack wrote: Perhaps I'm missing something, but I can't see where you define your getChar() and printf() functions. As per the previous post, slagging off a particular operating system just makes you look like a kid trying (unsuccessfully) to be cool. I managed to find those... Inside the headers... Ah, I see them. That's going to lead to tears before bedtime. |
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| Author: | MichaelPetch [ Fri Oct 27, 2017 11:11 pm ] |
| Post subject: | Re: Strange input glitch |
I think you should consider looking at your CAPSLOCK and Shift handling code. I ran your code and originally couldn't reproduce the problems you mentioned, but I didn't use upper case characters. I accidentally turned on CAPSLOCK and discovered things go really wrong and then seem to cause issues for any command after that happens to have upper case letters in it. I also noticed that things start failing if I enter a number of characters while holding down the shift key. It seems if you follow them with a space things go terribly wrong. You may wish to revisit the code you have to process SHIFT/CAPSLOCK - you've got serious problems there. |
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