converting (.cpp) instructions to (.c) ones

This is a discussion on converting (.cpp) instructions to (.c) ones within the C Programming forums, part of the General Programming Boards category; hi all, i hope that someone can help me to sove this problem. i didn't understand exactly the meaning of ...

  1. #1
    Registered User
    Join Date
    Apr 2008
    Posts
    2

    converting (.cpp) instructions to (.c) ones

    hi all, i hope that someone can help me to sove this problem.

    i didn't understand exactly the meaning of these code lines:
    Code:
    14.	[B]char *ecran  = (char *) (0xA0000000L);[/B]
    15.	
    16.	
    17.	char *virtuel = new unsigned char[64000L];
    18.	
    19.	
    20.	
    21.	void setmode(unsigned int mode)
    22.	
    23.	{
    24.	
    25.	asm {
    26.	
    27.	MOV AX, [mode]
    28.	
    29.	INT 0x10
    30.	31.	}}
    32.	
    33.	
    34.	//CLS l'ecran.
    35.	
    36.	void clsvirt()
    37.	
    38.	{memset(virtuel,0,64000L);}
    39.	
    40.	
    41.	//RAM TO memoire video
    42.	
    43.	void cpyvirt()
    44.	
    45.	{memcpy(ecran,virtuel,64000L);}
    46.	
    47.	
    48.	//Ecran virtuel
    49.	
    50.	void pixel(int x, int y, unsigned char col)
    51.	
    52.	{virtuel[(y*320)+x] = col;}
    53.
    i need to know exactly what the bold numbers refer to so i will be able to
    write a C code similar to these precedent lines . thanks

  2. #2
    Captain Crash brewbuck's Avatar
    Join Date
    Mar 2007
    Location
    Portland, OR
    Posts
    7,159
    The code in question has nothing to do with either C or C++.

  3. #3
    CSharpener vart's Avatar
    Join Date
    Oct 2006
    Location
    Rishon LeZion, Israel
    Posts
    6,424
    operator new is to be replaced with the call to malloc... but if you do not know what
    Code:
    64000L
    this number is, I really doubt you'll be able to make the adoptation...
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

  4. #4
    and the hat of sweating
    Join Date
    Aug 2007
    Location
    Toronto, ON
    Posts
    3,545
    Code:
    char *virtuel = new unsigned char[64000L];
    is basically the same as:
    Code:
    char *virtuel = malloc( 64000L );
    as for the assembly, I have no idea -- it's not C or C++.

  5. #5
    Banned master5001's Avatar
    Join Date
    Aug 2001
    Location
    Visalia, CA, USA
    Posts
    3,685
    Its ok guys, its just hex. So he wants 0x64000.

    Your inlined assembler on the other hand could be a problem unless you are working with DOS or something since you can't just go around calling interrupt 16 in C/C++...

    What are you wanting to do? And please tell me you are writing DOS code...

  6. #6
    Registered User slingerland3g's Avatar
    Join Date
    Jan 2008
    Location
    Seattle
    Posts
    602
    Dealing with asm is a whole nother ball game. Perhaps the below link may guide you in the right direction, if you are using gcc?

    http://asm.sourceforge.net/articles/linasm.html

  7. #7
    Banned master5001's Avatar
    Join Date
    Aug 2001
    Location
    Visalia, CA, USA
    Posts
    3,685
    Not only is it "a whole nother ball game." I will strongly contend that you are likely trying to do something that you simply are not allowed to do in the protected memory model.

  8. #8
    Registered User
    Join Date
    Apr 2008
    Posts
    2
    Quote Originally Posted by master5001 View Post
    Its ok guys, its just hex. So he wants 0x64000.

    Your inlined assembler on the other hand could be a problem unless you are working with DOS or something since you can't just go around calling interrupt 16 in C/C++...

    What are you wanting to do? And please tell me you are writing DOS code...

    hi, no I m just trying to implement a 3D synthesis code on an FPGA ; there are some instructions that should be modified to adapt the code to the target device.

  9. #9
    and the hat of sweating
    Join Date
    Aug 2007
    Location
    Toronto, ON
    Posts
    3,545
    Quote Originally Posted by master5001 View Post
    Its ok guys, its just hex. So he wants 0x64000.
    64000L == 0x64000? I don't think so.

  10. #10
    Banned master5001's Avatar
    Join Date
    Aug 2001
    Location
    Visalia, CA, USA
    Posts
    3,685
    Quote Originally Posted by cpjust View Post
    64000L == 0x64000? I don't think so.
    Yeah cpjust, you're right. I guess we are all entitled slow days. Its an signed value. Either way, the point remains the same reguarding what he is trying to do. However, in light of knowing what you are aiming for now, sunshine, I can tell you that your use of INT 0x10 is ok. But there is not a portable equivelant to the assembler, no less. So why not keep the inline assembler? Its not doing any harm.

  11. #11
    and the hat of wrongness Salem's Avatar
    Join Date
    Aug 2001
    Location
    The edge of the known universe
    Posts
    32,337
    > no I m just trying to implement a 3D synthesis code on an FPGA
    How about starting with a decent and modern 32-bit compiler with a 3D graphics library then.

    Not only will you benefit hugely from not having to deal with awfully small (by today's standards) 64K memory segments from DOS, you won't have to deal with getting a lot of 3D graphics code working either.

    The code you posted belongs in a museum, leave it there and join this millenium.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. functions in .C file not recognized in .CPP file
    By tooKool4School6 in forum C++ Programming
    Replies: 1
    Last Post: 06-02-2006, 10:30 AM
  2. filename pattern matching
    By dwks in forum C Programming
    Replies: 11
    Last Post: 07-13-2005, 10:23 AM
  3. Converting .exe to .cpp or .c
    By OmnipotentCow in forum C Programming
    Replies: 10
    Last Post: 06-19-2003, 12:52 PM
  4. placement of (.h) and (.cpp) files..!?
    By matheo917 in forum C++ Programming
    Replies: 3
    Last Post: 02-22-2003, 05:37 PM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21