[cpp]: Bugfix for filename with prepended path. Fix for issue aeron-io#88.

Author: mjpt777

main/java/uk/co/real_logic/sbe/SbeTool.java

@@ -123,8 +123,11 @@ else if (fileName.endsWith(".sbeir"))
 
  if (Boolean.parseBoolean(System.getProperty(GENERATE_IR, "false")))
  {
- final int nameEnd = fileName.lastIndexOf('.');
- final String namePart = fileName.substring(0, nameEnd);
+ final File inputFile = new File(fileName);
+ final String inputFilename = inputFile.getName();
+
+ final int nameEnd = inputFilename.lastIndexOf('.');
+ final String namePart = inputFilename.substring(0, nameEnd);
 
  final String outputDirName = System.getProperty(OUTPUT_DIR, ".");
  final File fullPath = new File(outputDirName, namePart + ".sbeir");