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Added clarification on buffer alignment.

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In v2, the lookahead_buffer was changed from requiring 4-byte alignment
to requiring 8-byte alignment. This was not documented as well as it
could be, and as FabianInostroza noted, this also implies that
lfs_malloc must provide 8-byte alignment.

To protect against this, I've also added an assert on the alignment of
both the lookahead_size and lookahead_buffer.

found by FabianInostroza and amitv87
This commit is contained in:
Christopher Haster
2019-04-09 18:07:44 -05:00
parent c2c2ce6b97
commit 1ff6432298
3 changed files with 6 additions and 3 deletions
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5
lfs.h
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@@ -215,8 +215,9 @@ struct lfs_config {
// By default lfs_malloc is used to allocate this buffer.
void *prog_buffer;
// Optional statically allocated program buffer. Must be lookahead_size.
// By default lfs_malloc is used to allocate this buffer.
// Optional statically allocated lookahead buffer. Must be lookahead_size
// and aligned to a 64-bit boundary. By default lfs_malloc is used to
// allocate this buffer.
void *lookahead_buffer;
// Optional upper limit on length of file names in bytes. No downside for