[PATCH 0/2] Add MEMZERO_ARRAY() macro and use it in coccinelle

A bug was found[1] in git-last-modified(1), caused by uninitialized memory. While the bug is fixed, in the discussion after that[2] the suggestion was made to introduce a macro that simplifies zeroing a dynamically allocated array.

In the first patch I'm addressing the outcome of the discussion on the patch, and in the second patch I'm fixing an edge-case I've encountered while using coccinelle.

There's one /oddball/ in add-patch.c that doesn't get caught by the coccinelle rules, around line 960:

    memset(hunk + 1, 0, (splittable_into - 1) * sizeof(*hunk));

Because there's some quirky pointer math going on, it think it's better to keep it like it is.

There were some mixed opinions about naming it either CLEAR_ARRAY() or MEMZERO_ARRAY(). I choose the latter because I wanted to avoid confusion that "clear" would shrink the array to zero elements.

[1]: <4dc4c8cd-c0cc-4784-8fcf-defa3a051087@mit.edu> [2]: <20251208201501.GA216526@coredump.intra.peff.net>

Signed-off-by: Toon Claes <toon@iotcl.com>
---
Toon Claes (2):
      git-compat-util: introduce MEMZERO_ARRAY() macro
      contrib/coccinelle: pass include paths to spatch(1)

 Makefile                       |  2 +-
 builtin/last-modified.c        |  2 +-
 compat/simple-ipc/ipc-win32.c  |  2 +-
 contrib/coccinelle/array.cocci | 20 ++++++++++++++++++++
 contrib/coccinelle/meson.build |  6 ++++++
 diff-delta.c                   |  2 +-
 ewah/bitmap.c                  |  7 +++----
 git-compat-util.h              |  1 +
 hashmap.c                      |  2 +-
 pack-revindex.c                |  2 +-
 10 files changed, 36 insertions(+), 10 deletions(-)

--- base-commit: 011ce54c26318d725db1d8971d157656eb965d88 change-id: 20251210-toon-cocci-memzero-2b6185e08ac4