Patch for Review: JvGetStringUTF and JvTempCString

[Mohan Embar]

>>I totally agree that we have a problem here, I just wonder if this is 
>>the right solution. Two things that would make me like this better:
>>
>>1. Can it be made to allocate only the space that it needs on the 
>>stack?
>
>How? (The only way I can think of doing this in one line is with a macro.)

#define JV_TEMP_UTF_STRING(jstr, buf) \
  char* buf = __builtin_alloca (JvGetStringUTFLength (jstr) + 1); \
  JvGetStringUTFChars(jstr, buf);

Not sure how I feel about this.

-- Mohan
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