nxt_min()
nxt_max()
Return the minimum/maximum of two values.
nxt_swap()
Swap the values of two variables passed by their addresses.
nxt_sizeof_array()
Return the size (in bytes) of an array.
nxt_nitems()
Return the number of elements in an array.
nxt_memberof()
Expand to a member of a structure. It uses a compound literal for
the object.
nxt_sizeof_incomplete()
Calculate the size of an incomplete type, as if sizeof() could be
applied to it.
nxt_sizeof_fam0()
Calculate the size of each element of a FAM of a structure.
nxt_sizeof_fam()
Calculate the size of a FAM of a structure.
nxt_offsetof_fam()
Calculate the offset of the nth element of the FAM from the start of
the containing structure.
nxt_sizeof_struct()
Calculate the total size of a structure containing a FAM. This
value is the one that should be used for allocating the structure.
Suggested-by: Andrew Clayton <a.clayton@nginx.com>
nxt_is_near_end()
Evaluate to true if the member is near the end of a structure. This
is only designed to be used with FAMs, to make sure that the FAM is
near the end of the structure (a zero-length array near the end of
the structure would still pass this test, but it's a reasonable
assertion to do.
Suggested-by: David Laight <David.Laight@ACULAB.COM>
nxt_is_zero_sizeof()
Evaluate to true if the size of 'x' is 0.
nxt_is_same_type()
Evaluate to true if the both arguments are compatible types.
nxt_is_same_typeof()
Evaluate to true if the types of both arguments are compatible.
nxt_is_array()
Evaluate to true if the argument is an array.
nxt_must_be()
It's like static_assert(3), but implemented as an expression. It's
necessary for writing the must_be_array() macro. It's always
evaluates to (int) 0.
nxt_must_be_array()
Statically assert that the argument is an array. It is an
expression that always evaluates to (int) 0.
nxt_must_be_zero_sizeof()
Statically assert that the argument has a size of 0.
nxt_must_be_near_end()
Statically assert that a member of a structure is near the end of
it.
Suggested-by: David Laight <David.Laight@ACULAB.COM>
nxt_must_be_fam()
Statically assert that the argument is a flexible array member
(FAM). It's an expression that always evaluates to (int) 0.
Link: <https://gustedt.wordpress.com/2011/03/14/flexible-array-member/>
Link: <https://lore.kernel.org/lkml/202308161913.91369D4A@keescook/T/>
Link: <https://inbox.sourceware.org/gcc/dac8afb7-5026-c702-85d2-c3ad977d9a48@kernel.org/T/>
Link: <https://stackoverflow.com/a/57537491>
Link: <https://github.com/shadow-maint/shadow/pull/762>
Cc: Andrew Clayton <a.clayton@nginx.com>
Cc: Zhidao Hong <z.hong@f5.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>