Re: [Mingw-users] How does malloc work?

[Michael G. <mg...@te...>]

Hi Liam !

You have a misconception about passing pointers to subroutines.

You have 'int getDataToken(char* data, char* dataToken, int tokenNbr)'
which means getDataToken gets a _local_copy_ of dataToken (which
initially points to the same memory as the copy in the invoking
code. Later in your function you change the value of the copy by
calling realloc. Now you have changed the copy but not the original.

In fact you also invalidated the memory the original does point to.

To achieve what you are after you'll have to pass a _pointer_ to
the pointer you wish to change:
int getDataToken(char* data, char** dataToken, int tokenNbr)
which is invoked by=20
=C2=A0 =C2=A0 err =3D getDataToken(HTTPData, &dataToken, 0);

Inside of getDataToken you have to replace all dataToken by
(*dataToken).

Doing that will yield the desired result (i.e. not regarding
possible other programming error ;-)

HTH, best,
Michael
=2D-=20
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 Michael Gerdau       email: mg...@te...
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