[bug] fasm.exe: predefined labels with embedded spaces

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revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20700
Location: In your JS exploiting you and your system

revolution 30 Apr 2016, 05:35

With fasm.exe (console version) trying to define a label with a space from the command line will cause fasm to quit without an error.

Code:

C:\>fasm source.asm -m 1000 -d x=y\ z
flat assembler  version 1.71.51  (1000 kilobytes memory)

C:\>

It makes no difference if the file "source.asm" exists or not. The label 'x' should be defined to 'y z'.

Using 'define x y z' in the source file will define the label correctly.

Edit: Fixed in version 1.71.52

Last edited by revolution on 28 May 2016, 16:25; edited 1 time in total

30 Apr 2016, 05:35

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20700
Location: In your JS exploiting you and your system

revolution 01 May 2016, 05:20

This appears to be a misplaced jump destination. If we change line 104 in "PREPROCE.INC" it appears to fix the problem:

Code:

        cmp     al,20h
        je      convert_line_data
        cmp     al,3Bh

Code:

        cmp     al,20h
        je      convert_predefinition ;<---- new destination
        cmp     al,3Bh

Code:

C:\>fasm source.asm -m 1000 -d x=y\ z
flat assembler  version 1.71.51  (1000 kilobytes memory)
error: source file not found.

C:\>

And now properly returns an error status. And if the source file exists then it proceeds to assemble as usual with the defined value as specified.

01 May 2016, 05:20

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