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Input Characters
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Join Date: Jul 2009
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Junior Poster
Hello,
I'm beginning in the OS development(In Assembly, Nasm as Assembler) and i need to implement a command-line on it, but i don't know how to do this, but what i want to say as command-line is like MS-DOS or UNIX:
But i don't know how to do the input method(ver in the command). In the repetition of the
The only thing that i need too know how to do is the input characters method.
Thanks,
Nathan Paulino Campos
I'm beginning in the OS development(In Assembly, Nasm as Assembler) and i need to implement a command-line on it, but i don't know how to do this, but what i want to say as command-line is like MS-DOS or UNIX:
Assembly Syntax (Toggle Plain Text)
> before the user input things i know, i only need to do a JMP to the section that prints the > and the input method, if it's needed, here is my code: asm Syntax (Toggle Plain Text)
Thanks,
Nathan Paulino Campos
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Practically a Posting Shark
You're using the 0x10 VIDEO BIOS services handler for your video handling so use the 0x16 KEYBOARD BIOS services handler for your keyboard handling!
Assembly Syntax (Toggle Plain Text)
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Junior Poster
Hello wildgoose,
Thanks for your help, now i know that INT 16h is for keyboard, but if i want to improve like, the user types:
Thanks,
Nathan Paulino Campos
Thanks for your help, now i know that INT 16h is for keyboard, but if i want to improve like, the user types:
ver , then when he press enter the OS shows a message, like: ver DB "ver. 0.0.1" .Thanks,
Nathan Paulino Campos
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Practically a Posting Shark
After data entry, remove carriage return and set a terminator!
Create a master list of commands! A table lookup of string addresses and scan through the list one at a time and do a caseless string to data entered. When you find a caseless match you have your command. Then jump to the code to handle that command!
You could use a structure table that contains the pointer to the string, and address of the function.
Initially just write a string compare function and do a series of if-then's to find your matching string!
Create a master list of commands! A table lookup of string addresses and scan through the list one at a time and do a caseless string to data entered. When you find a caseless match you have your command. Then jump to the code to handle that command!
You could use a structure table that contains the pointer to the string, and address of the function.
Initially just write a string compare function and do a series of if-then's to find your matching string!
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Junior Poster
But how i can do this?
Sorry about this simple questions, but i'm learning Assembly for OS's.
Thanks for you attention!
Sorry about this simple questions, but i'm learning Assembly for OS's.
Thanks for you attention!
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Practically a Posting Shark
One step at a time
Visually inspect buffer to make sure the string is there intact!
Then work on a string compare function
Assembly Syntax (Toggle Plain Text)
Visually inspect buffer to make sure the string is there intact!
Then work on a string compare function
Assembly Syntax (Toggle Plain Text)
Last edited by wildgoose; Aug 25th, 2009 at 3:51 pm.
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Ok, i'm going to try, any thing i will post, but i know that i will not have problems, thanks!
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Hello wildgoose,
Now i'm getting this errors:
http://img253.imageshack.us/img253/3381/errorb.png
Why?
Thanks!
Now i'm getting this errors:
http://img253.imageshack.us/img253/3381/errorb.png
Why?
Thanks!
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Junior Poster
If it's needed, here is the code:
Thanks!
asm Syntax (Toggle Plain Text)
Thanks!
Last edited by Nathan Campos; Aug 25th, 2009 at 5:19 pm. Reason: ...
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Practically a Posting Shark
Look at the line number that contains the error and look for things.
Line#35
You may need the label on the same line as instruction. Some assemblers require this, some don't!
main: MOV BX, 0 ; Disable blinking.
Line#70 and #71
;Key db dup(128)
;Kscan db dup(128)
Key db 128 dup(?)
Kscan db 128 dup(?)
Line#81,82 should then be fixed.
Line#88 mov byte ptr Key[ bx - 1 ],0 ; Overwrite with
terminator
Wrong label name
mov ax,offset Key
Don't know about 92
mov dx,offset xVer
Line#35
You may need the label on the same line as instruction. Some assemblers require this, some don't!
main: MOV BX, 0 ; Disable blinking.
Line#70 and #71
;Key db dup(128)
;Kscan db dup(128)
Key db 128 dup(?)
Kscan db 128 dup(?)
Line#81,82 should then be fixed.
Line#88 mov byte ptr Key[ bx - 1 ],0 ; Overwrite with
terminator
Wrong label name
mov ax,offset Key
Don't know about 92
mov dx,offset xVer
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