Merged revisions 247335 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

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  r247335 | mmichelson | 2010-02-17 15:22:40 -0600 (Wed, 17 Feb 2010) | 20 lines
  
  Fix two problems in ast_str functions found while writing a unit test.
  
  1. The documentation for ast_str_set and ast_str_append state that
  the max_len parameter may be -1 in order to limit the size of the
  ast_str to its current allocated size. The problem was that the max_len
  parameter in all cases was a size_t, which is unsigned. Thus a -1 was
  interpreted as UINT_MAX instead of -1. Changing the max_len parameter
  to be ssize_t fixed this issue.
  
  2. Once issue 1 was fixed, there was an off-by-one error in the case
  where we attempted to write a string larger than the current allotted
  size to a string when -1 was passed as the max_len parameter. When trying
  to write more than the allotted size, the ast_str's __AST_STR_USED was
  set to 1 higher than it should have been. Thanks to Tilghman for quickly
  spotting the offending line of code.
  
  Oh, and the unit test that I referenced in the top line of this commit
  will be added to reviewboard shortly. Sit tight...
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.0@247338 f38db490-d61c-443f-a65b-d21fe96a405b

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