String handling fixes and simplifications #49
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* Refactor most of string handling code to use rb_str_* functions. This fixes numerous instances of unsafe string handling using strcpy/sprintf that could lead to buffer overflows and simplifies code in other places. * Don't copy ruby strings to stack buffers when not needed, just use STR2CSTR (requires RB_GC_GUARD). This fixes possible stack buffer overflows. * Change definition of STR2CSTR to StringValueCStr, as StringValuePtr does not even guarantee returning a null-terminated string.
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While working on my previous PR (#48) I ran into issues with string handling that would cause ruby to crash with a segfault. This PR aims to fix most (but not all) of those problems.
Things that are not fixed: