Christopher Haster 105907ba66 Cleaned up config usage in file logic ...

The main change here was to drop the in-place twiddling of custom
attributes to match the internal attribute structures. The original
thought was that this could allow the compiler to garbage collect more
of the custom attribute logic when not used, but since this occurs in
the common lfs_file_opencfg function, gc can't really happen.

Not twiddling the user's structure is the polite thing to do, opens up
the ability to store the lfs_attr structure in ROM, and avoids surprising
the user if they attempt to use the structure for their own purposes.

This means we can make the lfs_attr structure const and rely on the list
in the lfs_file_config structure, similar to how we rely on the global
lfs_config structure.

Some other tweaks:
- Dropped the global file_buffer, replaced entirely by per-file buffers.
- Updated LFS_INLINE_MAX and LFS_ATTR_MAX to correct values
- Added workaround for compiler bug related to zero initializer:
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119

2018-10-16 07:31:24 -05:00

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