screen.c help (previously "weird text...")

[distantvoices]

well, I suggest you provide yerself with a set of the va_args macros, and then - set off and implement a worker function for your kprintf, which loops throu a character string, outputs each 'normal character' and recognizes/parses special character combinations like '%d'

HTH

[dh]

va_args ? how do they work? oh oh! they support that "..." thing, right. sorry I don't get this as (like I already said) a real noobie!!

I do have a simple _Print command that supports \n and \b.

[distantvoices]

Dragon? DRAAAGON???!! Stop that hiding behind being new to c, OK? I've been new to that stuff too - a long time ago. *gg*

Roughly said, yes, the va_arg macros are for variable-length argument lists, which are "popped" off the stack one after the other via va_arg(sizeof (datatype)).

Why don't you try it out, hm? have a look at Solars pdclib: there is an implementation of those macros.

... gonna rant on this when I'm at home, don't worry. You'll get a nice explanation.

[dh]

woow...don't rant over this. I barely know anything about C. I've been doing it less then a month!!!

Thanks for the advice...and I'll stop saying that if it helps. (I would assume that people want to know /why/ I don't understand...)

Long live BASIC!

[dh]

what I ment by "long live basic" is i have a color, locate and _print command. ease of use forever.

does anybody know where to get a chart explaining the color byte? i lost mine .

xxx_xxxx
| |
| FG
BG


Is this right ??? ???

[Pype.Clicker]

http://www.osdev.org/osfaq2/index.php/HardWareVga should be *da* place 2 check ...

iirc,

Code: Select all

enum {
   FG_BLUE = 1,
   FG_GREEN = 2,
   FG_RED=4,
   FG_BRIGHT=8,
   BG_BLUE=0x10,
   BG_GREEN=0x20,
   BG_RED=0x40,
   BLINK_OR_BG_BRIGHT_DEPENDING_ON_VGA_SETUP=0x80,
};

Yellow on dark blue is, for instance
FG_GREEN|FG_RED|FG_BRIGHT|BG_BLUE

[dh]

OHHH THANKYOU!!!! I was trying to do it all by trial and error and you wouldn't believe how many possibilties there is!!

oh ya: http://osdev.neopages.net/FreeVGA/vga/colorreg.htm is broken :'P *cry*. In fact, a LOT of links are broken :'P.

Do the colors in qbasic work? They go from 0 to 15. I know that only the first 7(?) can be used for backgrounds. Input apreacheated!

[Pype.Clicker]

they work the same way as shown (e.g. color 9 is BLUE|BRIGHT, color 0 is black, etc.)
BLUE|GREEN == CYAN, BLUE|RED==MAGENTA, etc.

Only 8 colors (0..7) are avl. for background because in QBASIC, the highest bit is for blinking or something alike ...

You can theorically enable 16 colors for background

[bubach]

Only 8 colors (0..7) are avl. for background because in QBASIC, the highest bit is for blinking or something alike ...

not only in qbasic, in textmode.

You can theorically enable 16 colors for background

if you are willing to give up blinking. there?s some vga reg you can change to do this.

[HOS]

You can theorically enable 16 colors for background

if you are willing to give up blinking. there?s some vga reg you can change to do this.

cool. would you mind telling how or pointing to how?

[dh]

ya, I could easily do without blinking. i got something like this

Code: Select all

typedef enum ColorCodes
{
   BLACK=0
   BLUE=1
   ...
   BG_BLACK=0x01
   BG_BLUE=0x02
} ColorCodes;

With this I would assumme you would have this to combine them:

Code: Select all

void ChangeColor(ColorCodes fg, ColorCodes bg)
{
  _COLOR = fg || bg /* assuming || is or....can't remember :P */
}

[AR]

/* assuming || is or....can't remember :P */

|| is a logical or (ie. if(true || true);), | is the bitwise or

[bubach]

sorry, i can?t remember where i read that. you?ll have to search for some vga-reg docs on google..

[dh]

no problemo. i'll post some links for everybody else too ;P

[Candy]

if you want to binary-or them together, you should use a single | character.

Also, you should use 0x10-folds for the background colors, IE, 0x10, 0x20 etc.