C codes for reading ASM file

This is a discussion on C codes for reading ASM file within the C Programming forums, part of the General Programming Boards category; Hi, I want to write a c program that will read .asm file and identify the assembly keywords. It should ...

  1. #1
    Registered User khpuce's Avatar
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    C codes for reading ASM file

    Hi,

    I want to write a c program that will read .asm file and identify the assembly keywords. It should create a .lst file which will also display an error message if there is any error in any line of the source code.

    I am not sure where to start and looking for some example C codes that does the job.

    Any help please ???

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    What platform and which assembler?

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    PS: a lot of C compilers will produce assembly code listings, and some will also compile assmbly code. This is what I'm going to suggest for finding "errors"

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    Registered User khpuce's Avatar
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    I think I better explain my problem a bit more.

    In the first phase, I am trying to write a C file that will read a text file which will have some assembly codes in it. When my program (C) is run, it will ask for a file name. Then it should read the text file (e.g. Myassembly.asm ) and check each line of that file to see whether it contains a valid code in a valid format. If it is a valid code it will just copy that line to another file (e.g. Myassembly.lst) including the line number. If it is not valid line or contains unrecognizable instruction in a line then it should copy the line to myassembly.lst with a suitable error message (e.g error in line 12). If the source line contains instuctions such as ADD R4,R5 then it should show (in the lst file) the correct encodded 16 bit instruction (e.g. 1100 0001 0000 0100 )

  5. #5
    and the hat of wrongness Salem's Avatar
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    Sounds like what you really need is an assembler. That would seem to be the most effective way of validating an assembler file.
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    Registered User khpuce's Avatar
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    Thanks Salem and sorry for my poor english. But that's exactly what I am trying to do. CREATING AN ASSEMBLER in C

    The thing is I don't know where to start. That's why I am looking for some pseudocodes/diagrams or some example C codes to do the job.

  7. #7
    Registered User Draco's Avatar
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    these look like they might be pretty useful
    http://www.google.com/search?hl=en&i...assembler+in+c

  8. #8
    Been here, done that.
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    You need to parse (analyse) each line of your file:

    Read a line
    Start at the beginning of the line
    Skip whitespace until you find a non-whitespace character. Save this location, say p1
    Skip ahead to the next whitespace character, say p2
    Now check the string from p1 thru p2-1 with your list of acceptable commands. If you find a match, you know the command you're dealing with.
    Parse the rest of the line using the format of the command found (1 register; 1 reg, 1 memloc; 2 reg; etc)

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