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https://github.com/autc04/Retro68.git
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127 lines
2.7 KiB
Java
127 lines
2.7 KiB
Java
/* This tests some corner cases of arithmetic in StringBuffer. */
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/* These tests can all be run on a 32 bit machine with modest amounts
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* of memory. */
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/* The symptom of the problem is that ArrayIndexOutOfBoundsException
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* gets thrown, while the documentation says that
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* StringIndexOutOfBoundsException should be thrown. */
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class StringBuffer_overflow
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{
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/* Test correct exception on getChars. */
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static void getChars()
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{
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StringBuffer b = new StringBuffer ("x");
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char[] s = new char [1];
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try
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{
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// The substring we are attempting to obtain is invalid,
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// so we should get a StringIndexOutOfBoundsException.
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b.getChars (1, -1 << 31, s, 0);
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Fail ("getChars", "no exception");
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}
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catch (Throwable e)
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{
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ExpectStringIndex ("getChars()", e);
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}
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}
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/* Test correct exception on append with bogus count. */
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static void append()
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{
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StringBuffer s = new StringBuffer("a");
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try
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{
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s.append ("".toCharArray(), 1, (1<<31)-1);
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Fail ("append", "no exception");
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}
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catch (Throwable e)
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{
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ExpectStringIndex ("append", e);
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}
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}
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// Check that append still more or less works.
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static void appendbasic()
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{
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StringBuffer s = new StringBuffer();
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try
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{
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if (!new StringBuffer().append ("abcdefg".toCharArray())
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.toString().equals ("abcdefg"))
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{
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Fail ("appendbasic", "append gives incorrect result");
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}
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}
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catch (Throwable e)
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{
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Fail ("appendbasic", e);
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}
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}
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/* Test correct expception on substring with bogus indexes. */
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static void substring()
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{
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StringBuffer s = new StringBuffer ("abc");
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try
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{
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// end - begin == -2 - ((1<<31)-1) == (1<<31) - 1 > 0. */
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s.substring ((1<<31)-1, -2);
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Fail ("substring", "no exception");
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}
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catch (Throwable e)
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{
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ExpectStringIndex ("substring", e);
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}
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}
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static void insert()
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{
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StringBuffer s = new StringBuffer ("");
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try
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{
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s.insert (0, "abcd".toCharArray(), (1<<31)-1, 1);
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Fail ("insert", "no exception");
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}
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catch (Throwable e)
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{
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ExpectStringIndex ("insert", e);
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}
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}
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public static void main (String[] unused)
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{
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getChars();
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append();
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appendbasic();
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substring();
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insert();
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if (tests_failed == 0)
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{
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System.out.println ("ok");
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}
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}
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static int tests_failed = 0;
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static void ExpectStringIndex (String name, Throwable exception)
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{
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if (! (exception instanceof StringIndexOutOfBoundsException))
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{
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Fail (name, exception);
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}
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}
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static void Fail (String name, Object why)
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{
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++tests_failed;
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System.err.print (name);
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System.err.print ('\t');
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System.err.println (why);
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}
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}
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