I want use something like this:
char TempIP[4];

if(sscanf(&console_str[2+1],"d.%d.d.%d",&TempIP[0],&TempIP[4],&TempIP[8],&TempIP[12])
== 4){
// do something
}
but IAR use only int to conver %d. In 8 bit cpu it work well but in
ARM7 core should use extera RAM.
is there any way to force IAR to use char inside of int for convert %d
in sscanf?

Thanks.
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Nader schrieb:
> I want use something like this:
> char TempIP[4];
>
> if(sscanf(&console_str[2+1],"d.%d.d.%d",&TempIP[0],&TempIP[4],&TempIP[8],&TempIP[12])
> == 4){
> // do something
> }
> but IAR use only int to conver %d. In 8 bit cpu it work well but in
> ARM7 core should use extera RAM.
> is there any way to force IAR to use char inside of int for convert %d
> in sscanf?

%d == int == 32 bit on ARM.

What you are intend to do is very very error prone.
I would not recommend sscanf(). What do you expect as user-inpit ?
Maybe atoi() does a better job.

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Nader Wrote
>I want use something like this:
>char TempIP[4];
>
>if(sscanf(&console_str[2+1],"d.%d.d.%d",&TempIP[0],&TempIP[4],&TempIP[8],&T
empIP[12])
>== 4){
> // do something
>}
>but IAR use only int to conver %d.

Of course.

>In 8 bit cpu it work well

Only if the compiler is non-standard. I've worked with ones that are
standard that would fail on your code as well. Admittedly a number of
compilers for 8 bit processors are broken in this regard.

What you have written is wrong even if the type sizes match (they could
legitimately if chars were 16bits in size or larger). I'll not mention you
are converting into non-existent array elements. Oops ;)

>but in
>ARM7 core should use extera RAM.

You likely have more ram to begin with anyway. Probably far more if you
are used to a compiler treating ints as if they were 8 bits.

>is there any way to force IAR to use char inside of int for convert %d
>in sscanf?

I would be surprised if there were.

Two ways to solve your problem

1) Don't use the ...scanf family. It's not really suited for a lot of
embedded work anyway. Make a simple ascii to integer conversion function
of your own and feed it the subset of the string you want to convert.

2) The quick and dirty approach which is quite legitimate for some
applications. Use scanf as you are with tempIP as a local int array and
add a copy to copy the scanned ints into a more permanent char storage. If
you are using scanf storage cannot really be a big concern of yours anyway
;)

Robert

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