Hey,
Let's talk about tmpstr again. After raising my concerns last week
regarding tmpstr_strlen, today I actually dove in to the code and fix
the major (solvable) issues with tmpstr.
The biggest problem with tmpstr, is that it's broken by design, and I
don't see how this could easily be solved.
So what is tmpstr?
According to the docs, tmpstr is there to let you be able to easily
return strings from functions without caring about freeing the data.
Example:
Eina_Tmpstr *my_homedir(void) {
return eina_tmpstr_add(getenv("HOME"));
}
void my_movefile(Eina_Tmpstr *src, Eina_Tmpstr *dst) {
rename(src, dst);
eina_tmpstr_del(src);
eina_tmpstr_del(dst);
}
char buf[500];
my_movefile("/tmp/file", "/tmp/newname");
my_movefile(my_homedir(), "/var/tmp");
This is essentially a wrapper around an allocated string that lets you
differentiate between a static string and a string you need to free.
At the moment it's implemented as a linked list of strings that need to
be searched every time you call add/del/len, and because it's threadsafe
it also acquires locks. This sounds painfully slow, and to be honest
normal strlen() would probably be faster than the tmpstr_len() in most
cases, or in other words, pointless waste of cache space.
To be honest, I just don't see how this really helps compared to a
simple malloc/free (which it kinda does anyway). I'd maybe also replace
the linked list with a hashtable. I just don't get it. Would like to
think what the rest of you have in mind.
--
Tom.
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