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reftable/basics: stop using SWAP() macro

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Stop using `SWAP()` macro in favor of an open-coded variant of it. Note
that this also requires us to open-code the build assert that `SWAP()`
itself uses to verify that the size of both variables matches.

This is done to reduce our dependency on the Git codebase.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt
2025-02-18 10:20:49 +01:00
committed by Junio C Hamano
parent 10f2935c7f
commit f8ed12dec4
4 changed files with 20 additions and 11 deletions
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9
reftable/basics.h
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@@ -266,6 +266,15 @@ static inline void *reftable_alloc_grow(void *p, size_t nelem, size_t elsize,
# define strdup(str) REFTABLE_BANNED(strdup)
#endif
#define REFTABLE_SWAP(a, b) do { \
void *_swap_a_ptr = &(a); \
void *_swap_b_ptr = &(b); \
unsigned char _swap_buffer[sizeof(a) - 2 * sizeof(a) * (sizeof(a) != sizeof(b))]; \
memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a)); \
memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
} while (0)
/* Find the longest shared prefix size of `a` and `b` */
size_t common_prefix_size(struct reftable_buf *a, struct reftable_buf *b);