Make a command line

Danand · Post by **Danand** » Thu Mar 27, 2008 2:03 pm

Hi alllllll!

I have done jamesmolloy's tutorial and i will now make a simple command line, or are the some other thing i most do first? If not, can somebody give me tutorials to how i make a simple command line?

Waves'
Danand

cyr1x · Post by **cyr1x** » Thu Mar 27, 2008 2:07 pm

Danand wrote: .. can somebody give me tutorials to how i make a simple command line?

Do you want to write an OS which is entirely based on tutorials or what?

Danand · Post by **Danand** » Thu Mar 27, 2008 2:12 pm

I have done some code myself, but I'm not so good yet. So I'm just need some help on the way, if you understand me..

cyr1x · Post by **cyr1x** » Thu Mar 27, 2008 2:20 pm

Anyway,

A command line is easy. You just compare the whole string starting at the first column to the first char '\n' with an other string if there's a match then do that or that. This could already be a basic CLI and is implemented in ca. 2 hours or even less.

t0xic · Post by **t0xic** » Thu Mar 27, 2008 2:20 pm

Well, you could add each key that is pressed into a buffer, and then parse that buffer (maybe run through an array of commands, looking for a match?).

@cyr1x: shouldn't even take 2 hours. (~30 minutes max for a minimal shell)

codemastersnake · Post by **codemastersnake** » Thu Mar 27, 2008 2:26 pm

Command line processing is done using a parser. The input string scanned and tokens are formed. then these tokens are cheked and a command is created.

Learn more about parsers on internet. Try google you will get some good tutorials.

t0xic · Post by **t0xic** » Thu Mar 27, 2008 2:29 pm

Code: Select all

	if (!strcmp(strtolower(input), shell_entries[i].name))
		{
			shell_entries[i].function(args);
			return;
		}

<-- Basic parser. Come up with the struct yourself, and loop through all of the entries.

Danand · Post by **Danand** » Thu Mar 27, 2008 2:36 pm

Ok.. But first, how do i write things? I can't write now, must i have a driver to keyboard?

t0xic · Post by **t0xic** » Thu Mar 27, 2008 2:40 pm

Well, if you want to have a command line, I figured that was a requirement

codemastersnake · Post by **codemastersnake** » Thu Mar 27, 2008 2:47 pm

Danand wrote:Ok.. But first, how do i write things? I can't write now, must i have a driver to keyboard?

Yes, That is a must! By the way how far have you come through with your OS

Danand · Post by **Danand** » Thu Mar 27, 2008 2:50 pm

I have everything that are on jamesmolloy's tutorials, and now I'm trying to find things on google, in this forum and wiki.. If somebody have i nice tutorials com with it!

codemastersnake · Post by **codemastersnake** » Thu Mar 27, 2008 3:03 pm

Try http://www.osdever.net there are plenty of good tutorials.

piranha · Post by **piranha** » Thu Mar 27, 2008 5:54 pm

and now I'm trying to find things on google, in this forum and wiki.. If somebody have i nice tutorials com with it!

All the info you need on making a command line is on theses sites!

Seriously, basic command lines are easy.

-JL

xyzzy · Post by **xyzzy** » Fri Mar 28, 2008 1:28 am

I'll repeat what others have said: You won't get a tutorial for everything. If you do everything in your OS from tutorials, it won't be "your" OS, and when you come to something that you can't find a tutorial for you'll most likely have no hope.

JamesM · Post by **JamesM** » Fri Mar 28, 2008 2:23 am

AlexExtreme wrote:I'll repeat what others have said: You won't get a tutorial for everything. If you do everything in your OS from tutorials, it won't be "your" OS, and when you come to something that you can't find a tutorial for you'll most likely have no hope.

Like now, for example!

@OP: You'll need a working keyboard driver. I am (actually) intending to put up a few more tutorials detailing moving to user mode, syscalls and writing drivers. So people like you can go a little further before you get completely stuck

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Make a command line

Make a command line

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