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commit 8209ae7a5ac541a1783aa4a47a70c30be24ed52e
Author: Milos Nikic <[email protected]>
Date: Fri Mar 27 22:02:43 2026 -0700
libihash: Prevent multiple evaluation in iteration macros
In HURD_IHASH_ITERATE and HURD_IHASH_ITERATE_ITEMS, the hash table
argument (ht) was evaluated multiple times during loop initialization
and condition checking. If a caller passed an expression with side
effects (e.g., a function call returning a table pointer), it would
be executed repeatedly per loop, leading to performance degradation
or unintended behavior.
Fix this by wrapping the iterators in a dummy outer `for` loop that
evaluates and caches `(ht)` exactly once using `__typeof__`. Token
pasting (##) is used to generate a unique cache variable name based
on the caller's item identifier, safely allowing these macros to be
nested without variable shadowing or naming collisions.
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Summary of changes:
libihash/ihash.h | 68 +++++++++++++++++++++++++++++++++++---------------------
1 file changed, 43 insertions(+), 25 deletions(-)
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