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| author | René Scharfe <l.s.r@web.de> | 2017-07-15 21:36:20 +0200 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2017-07-17 14:54:53 -0700 |
| commit | 578398071e45d296c3dc1de10acdbc15365e763f (patch) | |
| tree | d49c040e24d00c7d1c706e4146e4de2bdae1fa5f /git-compat-util.h | |
| parent | f3da2b79be9565779e4f76dc5812c68e156afdf0 (diff) | |
| download | git-578398071e45d296c3dc1de10acdbc15365e763f.tar.gz git-578398071e45d296c3dc1de10acdbc15365e763f.tar.xz | |
add MOVE_ARRAY
Similar to COPY_ARRAY (introduced in 60566cbb58), add a safe and
convenient helper for moving potentially overlapping ranges of array
entries. It infers the element size, multiplies automatically and
safely to get the size in bytes, does a basic type safety check by
comparing element sizes and unlike memmove(3) it supports NULL
pointers iff 0 elements are to be moved.
Also add a semantic patch to demonstrate the helper's intended usage.
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'git-compat-util.h')
| -rw-r--r-- | git-compat-util.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h index 047172d17..159f82154 100644 --- a/git-compat-util.h +++ b/git-compat-util.h @@ -825,6 +825,14 @@ static inline void copy_array(void *dst, const void *src, size_t n, size_t size) memcpy(dst, src, st_mult(size, n)); } +#define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \ + BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src)))) +static inline void move_array(void *dst, const void *src, size_t n, size_t size) +{ + if (n) + memmove(dst, src, st_mult(size, n)); +} + /* * These functions help you allocate structs with flex arrays, and copy * the data directly into the array. For example, if you had: |