String limit on a define?

[E_Blue]

There's a way to limit the size of a string when is defined?

The scenario is as follow, I have a code(program) that are send to a production environment, they customize some #define on a .h file and compile, until now nothing has happened, but now I wondering how to limit some of those strings to avoid errors.

Can be done at precompiler level?

I don't want to check every string, because those string have not the same size limits and are more than 50 parameters and will use a more ROM/FLASH memory, most of them are strings.

I'm talking about this coin of strings

[Ttelmah]

No.

However you could probably limit the output, when it is used.

[E_Blue]

That's what I want to avoid.
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Electric Blue

[Ttelmah]

Why?.

Just have your own output or use function, that accepts a constant string, and a size. Define sizes for your strings, and when they are passed to the function, have it count through the characters, till it sees a NULL, or reaches the size limit.

If you need to have different length limits, you are going to have to have defined sizes. Use them.

[E_Blue]

I don't have any size defined.
When the PIC start read a specific bytes from an external EEPROM, if those bytes are 0xFF or incongruous, it will go to default configuration that is copied from ROM to the external EEPROM and in that process the subroutine only copy

[jeremiah]

Well I can't give you compile time safety, but I did make a "poor man's" snprintf which gives you runtime safety.

https://www.ccsinfo.com/forum/viewtopic.php?t=53652

You can put the max size as a parameter and the snprintf function won't go any further. It does a return a little different than an sprintf because it returns the number of chars written OR the number of chars it would have written if you had the correct size buffer. You can mod the code to make it just return the number of chars written if you like.

It isn't very efficient (though no printf variation is normally anyways).

I know it isn't exactly what you asked for, but maybe could help.

EDIT: Also, it requires a version 5 compiler for the __VA_ARGS__ extension

[Ttelmah]

The other point is that you must have a size defined. Problem is that without a size, how is the compiler or code to know the size is too large?. Telepathy?.
Jeremiah's routine shows a way of implementing what I was talking about for an output routine.

[E_Blue]

[E_Blue]

jeremiah thanks for your answer and code, I'm reading it.
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Electric Blue

[Ttelmah]