Blocked revisions 185581 via svnmerge

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  r185581 | kpfleming | 2009-03-31 16:29:50 -0500 (Tue, 31 Mar 2009) | 19 lines
  
  Optimizations to the stringfields API
  
  This patch provides a number of optimizations to the stringfields API, focused around saving (not wasting) memory whenever possible. Thanks to Mark Michelson for inspiring this work and coming up with the first two optimizations that are represented here:
  
  Changes:
  
  - Cleanup of some code, fix incorrect doxygen comments
  
  - When a field is emptied or replaced with a new allocation, decrease the amount of 'active' space in the pool it was held in; if that pool reaches zero active space, and is not the current pool, then free it as it is no longer in use
  
  - When allocating a pool, try to allocate a size that will fit in a 'standard' malloc() allocation without wasting space
  
  - When allocating space for a field, store the amount of space in the two bytes immediately preceding the field; this eliminates the need to call strlen() on the field when overwriting it, and more importantly it 'remembers' the amount of space the field has available, even if a shorter string has been stored in it since it was allocated
  
  - Don't automatically double the size of each successive pool allocated; it's wasteful
  
  http://reviewboard.digium.com/r/165/
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.1@185593 f38db490-d61c-443f-a65b-d21fe96a405b

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