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Index > Macroinstructions > macros to handle scape sequences

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daluca



Joined: 05 Nov 2005
Posts: 86
daluca
hello: I have created these 2 macros to handle the scape sequence characters like
in the C languaje the names are str and stru for ascii and unicode they can be put
wherever the db or du can. (I think)

Code:

message: str 'Hello\nThere'

    


the colon after the message label is required,but the final 0 is not.
one good thing about these macros is that you can change the scape character
indicator :
I use the '\' as the scape indicator, and put only the n and t to be recognized as
scape sequences, but you can add any others you like

the only problem i have found is when you terminate the string with the character
indicator so if you want to print 'hello\' it would give an 'out of range' error
and this is because when the macro finds the '\' character it will load the next
character to see if it's one of the scape characters defined but there is nothimg more
to load, that is why the same scape indicator must be defined also as scape character
so the problem gets solved typing 'hello\\' and it will get printed correctly as
'hello\'

the behavior is different from the C compilers for instance: typing 'hello\q'
in borland C compiler will print 'helloq',so the '\' is ignored.
with these macros you will get 'hello\q' unless you have defined q to be other thing
lets say:
Code:

  else if char2 = 'q'
        char = '"'


    


then you will get :

Code:

'hello"'

    


here are the macros

Code:

macro str string
{          ;get strinf size
virtual at 0
db string
size=$-$$
end virtual
;-------------------------------
count = 1
repeat size
virtual at 1
db string


load char byte from count
if char = '\'
        load char2 byte from count+1
        if char2 = '\'
        char = '\'
        count = count+1
        else if char2 = 't'
        char = 9
        count =count+1
        else if char2 = 'n'
        char = 13
        count = count+1
        end if
end if
end virtual

db char
if count = size
        break
end if
count = count+1
end repeat
db 0
}


    




Code:

 macro stru string
{          ;get strinf size
virtual at 0
db string
size=$-$$
end virtual
;-------------------------------
count = 1
repeat size
virtual at 1
db string


load char byte from count
if char = '\'
        load char2 byte from count+1
        if char2 = '\'
        char = '\'
        count = count+1
        else if char2 = 't'
        char = 9
        count =count+1
        else if char2 = 'n'
        char = 13
        count = count+1
        end if
end if
end virtual

dw char
if count = size
        break
end if
count = count+1
end repeat
dw 0
}


    
Post 04 Aug 2007, 07:04
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bogdanontanu



Joined: 07 Jan 2004
Posts: 403
Location: Sol. Earth. Europe. Romania. Bucuresti
bogdanontanu
Nice... but Very Happy

I find this much more clear, readable and more ASM style Wink
Code:
message  db 'Hello',13,10,'There',0
    


If needed you can always redefine:
Code:
ASCII_CR EQU 13
ASCII_LF EQU 10
    
Post 04 Aug 2007, 07:42
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