basic/qa/basic_coverage/test_string_overflow_safe.bas

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   2 '
   3 ' This Source Code Form is subject to the terms of the Mozilla Public
   4 ' License, v. 2.0. If a copy of the MPL was not distributed with this
   5 ' file, You can obtain one at http://mozilla.org/MPL/2.0/.
   6 '
   7
   8 Option Explicit
   9
  10 Function doUnitTest As String
  11     ' Trying to create too long string should generate proper BASIC overflow error.
  12     ' Longest possible string is 2147483638 wchar_t (2G - 10).
  13     ' This tries to create string with 2G wchar_t. If it does not overflow, test fails.
  14     ' If overflow is not safe, it segfaults.
  15     On Error GoTo errorHandler
  16     Dim s As String, i As Integer
  17     s = "0"
  18     For i=1 To 31
  19     s = s & s
  20     Next i
  21     doUnitTest = "FAIL"
  22     Exit Function
  23 errorHandler:
  24     If ( Err <> 6 ) Then
  25         doUnitTest = "FAIL"
  26     Else
  27         doUnitTest = "OK"
  28     Endif
  29 End Function