Created attachment 359061 [details]
Input to reproduce the infinite loop

Description of problem:

With the attached input files ctags jumps into infinite loop or gets segment fault.

Version-Release number of selected component (if applicable):

ctags-5.7-4.fc11.x86_64

How reproducible:

For reproducing infinite loop, use hgcommand-infinite-loop.vim as argument for ctags.

For reproduce segment fault, use hgcommand-segment-fault.vim as argument for ctags.

Steps to Reproduce:
* infinite loop
  ctags hgcommand-infinite-loop.vim

* segment fault
  ctags hgcommand-segment-fault.vim

Actual results:

Never returned to shell or segment fault.

Expected results:

Returned to shell successfully.

Additional info:
See the attached patch.