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/* This tests some corner cases of arithmetic in StringBuffer. */
/* These tests can all be run on a 32 bit machine with modest amounts
* of memory. */
/* The symptom of the problem is that ArrayIndexOutOfBoundsException
* gets thrown, while the documentation says that
* StringIndexOutOfBoundsException should be thrown. */
class StringBuffer_overflow
{
/* Test correct exception on getChars. */
static void getChars()
{
StringBuffer b = new StringBuffer ("x");
char[] s = new char [1];
try
{
// The substring we are attempting to obtain is invalid,
// so we should get a StringIndexOutOfBoundsException.
b.getChars (1, -1 << 31, s, 0);
Fail ("getChars", "no exception");
}
catch (Throwable e)
{
ExpectStringIndex ("getChars()", e);
}
}
/* Test correct exception on append with bogus count. */
static void append()
{
StringBuffer s = new StringBuffer("a");
try
{
s.append ("".toCharArray(), 1, (1<<31)-1);
Fail ("append", "no exception");
}
catch (Throwable e)
{
ExpectStringIndex ("append", e);
}
}
// Check that append still more or less works.
static void appendbasic()
{
StringBuffer s = new StringBuffer();
try
{
if (!new StringBuffer().append ("abcdefg".toCharArray())
.toString().equals ("abcdefg"))
{
Fail ("appendbasic", "append gives incorrect result");
}
}
catch (Throwable e)
{
Fail ("appendbasic", e);
}
}
/* Test correct expception on substring with bogus indexes. */
static void substring()
{
StringBuffer s = new StringBuffer ("abc");
try
{
// end - begin == -2 - ((1<<31)-1) == (1<<31) - 1 > 0. */
s.substring ((1<<31)-1, -2);
Fail ("substring", "no exception");
}
catch (Throwable e)
{
ExpectStringIndex ("substring", e);
}
}
static void insert()
{
StringBuffer s = new StringBuffer ("");
try
{
s.insert (0, "abcd".toCharArray(), (1<<31)-1, 1);
Fail ("insert", "no exception");
}
catch (Throwable e)
{
ExpectStringIndex ("insert", e);
}
}
public static void main (String[] unused)
{
getChars();
append();
appendbasic();
substring();
insert();
if (tests_failed == 0)
{
System.out.println ("ok");
}
}
static int tests_failed = 0;
static void ExpectStringIndex (String name, Throwable exception)
{
if (! (exception instanceof StringIndexOutOfBoundsException))
{
Fail (name, exception);
}
}
static void Fail (String name, Object why)
{
++tests_failed;
System.err.print (name);
System.err.print ('\t');
System.err.println (why);
}
}
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