[Patch] StringBuffer.java index checking.

[Ralph Loader]

This fixes 4 cases of index checking in StringBuffer, with test cases.

Passes make check in libjava.

In each case, the comments indicate that StringIndexOutOfBoundsException
should be thrown.  Without the fixes, ArrayIndexOutOfBoundsException can
be thrown.

Again, there are more cases where integer overflow might happen, but you
probably need large amounts of memory to trigger them.

2003-09-24  Ralph Loader  <suckfish@ihug.co.nz>

	* java/lang/StringBuffer.java (getChars): Fix array index checks.
	(append, substring, insert): Likewide.
	* testsuite/libjava.lang/StringBuffer_overflow.java: New file.
	* testsuite/libjava.lang/StringBuffer_overflow.out: New file.

Ralph.

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