Noteworthy changes in release 2.6.13 (2026-11-14) [stable]

scanner

• A scanner built with %array no longer reads or writes before the
  start of its input buffer when yymore() is used after the scanner
  switches buffers, after unput() has pushed text back to the start
  of the buffer, or after the program has lengthened yytext. Since
  flex 2.6.5 the scanner could point yytext before the buffer, and the
  next refill or yyless() then went outside it. The text saved by
  yymore() now ends at the start of the buffer. (#809)

  Thanks to anshal ossaimi.

• A scanner with a very large set of rules is built correctly again.
  Since flex 2.6.5, some of its tables could be given an element type
  too small for the numbers stored in them. A C++ compiler rejected
  the generated file with "narrowing conversion" errors. A C compiler
  only warned, and in our test the scanner then looped forever.
  Doxygen's code scanner is one example. Flex now chooses the types
  as 2.6.4 did, and for a table of offsets or indexes by the largest
  value it can hold. Two other tables of such a scanner are also half
  the size they had become. (#816)

  Thanks to Christoph Grüninger.

• A scanner that loads its tables from a file works again on 32-bit
  systems. Since flex 2.6.5 the loader took a table of indexes for a
  table of integers where a pointer is four bytes wide, and refused
  the file with "table id not found in map". The tests for tables
  files failed on i686 and on 32-bit ARM. (#838)

  Thanks to Christoph Grüninger.