Empty strings aren't really bbEmptyString

BlitzMax Forums/BlitzMax Programming/Empty strings aren't really bbEmptyString

plash

(Posted 2010) [#1]

Empty strings don't seem to point to bbEmptyString.

In my other code I'm not passing the default parameter as anything and it's showing up as ""'s address, which isn't the case here (not passing the default parameter in the code below will actually use Null, which is bbEmptyString).
I'm checking the length of the string instead of comparing it against bbEmptyString for now.

SuperStrict

Framework brl.blitz
Import brl.standardio

Import "test.c"

Extern "c"
	Function teststring(str:String)
End Extern

Local blah:TBlah = New TBlah
blah.foobar("") ' What is this pointing to? It definitely isn't bbEmptyString
blah.foobar("") ' The address doesn't change, either. Maybe that's just good assembly code
blah.foobar(Null) ' This points to bbEmptyString, though
blah.foobar() ' And this (as expected.. though it isn't the case in my other code)
blah.foobar("qwerty")

Type TBlah
	Method foobar(str:String = Null)
		teststring(str)
	End Method
End Type

#include <brl.mod/blitz.mod/blitz.h>
#include <stdlib.h>

extern void teststring(BBString* str) {
	printf("str=\"%s\"  str#%p, empty#%p, null#%p\n", bbTmpCString(str), str, &bbEmptyString, &bbNullObject);
}

Output:

str=""  str#0x805ef40, empty#0x805e1d0, null#0x805e2b0
str=""  str#0x805ef40, empty#0x805e1d0, null#0x805e2b0
str=""  str#0x805e1d0, empty#0x805e1d0, null#0x805e2b0
str=""  str#0x805e1d0, empty#0x805e1d0, null#0x805e2b0
str="qwerty"  str#0x805ef7c, empty#0x805e1d0, null#0x805e2b0