Wireshark-dev: Re: [Wireshark-dev] Bug 976
From: Guy Harris <[email protected]>
Date: Fri, 21 Jul 2006 14:44:04 -0700
On Jul 21, 2006, at 12:57 PM, Martin Mathieson wrote:

I think I wouldn't have created this bug in the first place if the function was instead called proto_tree_add_text_format(). I didn't realise the last
arg was a format string - I'm used to those function names having the
_format suffix.
That might be a change worth making before 1.0; fortunately, it's  
something that can be done mechanically.
The other (slightly) strange thing is that when the format string (which is
supposed to be a const char*) was created by tvb_format_text() (which
returns a char*), I don't think my version of gcc showed a warning.
Passing a "char *" to a routine expecting a "const char *" is OK.   
It's like lending your neighbor a piece of paper if
	1) you don't care if your neighbor writes all over it

and

	2) your neighbor only plans to use it as a sun shade.

I.e., since it's a "char *", it's OK to write over it, but the routine you're passing it to is promising not to write over it, since the formal argument is a "const char *".
It's the other way around that's a problem - passing a "const char  
*", i.e. a string that's not supposed to be written on or destroyed  
to a routine whose formal argument is a "char *", i.e. it makes no  
promises that it won't write on it or destroy it.