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Document the return NULL style of calling convention

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Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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Shawn O. Pearce 2008-10-31 18:30:22 -07:00
parent 6533aadc21
commit 6dafd05667
1 changed files with 12 additions and 0 deletions
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12
CONVENTIONS
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@ -57,6 +57,18 @@ This permits common POSIX result testing:
abort("odb open failed"); abort("odb open failed");
---- ----
Functions returning a pointer may return NULL instead of an int
if there is only one type of failure (ENOMEM).
Functions returning a pointer may also return NULL if the common
case needed by the application is strictly success/failure and a
(possibly slower) function exists that the caller can use to get
more detailed information. Parsing common data structures from
on-disk formats is a good example of this pattern; in general a
"corrupt" entity can be treated as though it does not exist but
a more sophisticated "fsck" support function can report how the
entity is malformed.
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