cppcheck_c23_compat.h File Reference

cppcheck-only C23 compatibility shim, force-included by the gate. More...

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Macros
#define	nullptr   ((void*)0)

Detailed Description

cppcheck-only C23 compatibility shim, force-included by the gate.

The pinned analyser (cppcheck 2.13, enforced by require_tool_versions) does not recognise the C23 nullptr keyword as a null pointer constant. A guard such as if (fp == nullptr) { return err; } therefore fails to convince its value-flow engine that fp is null on that path, and it reports a false-positive resourceLeak / memleak on every fopen or malloc guarded that way.

Firmware never trips this: NASA Power-of-10 Rule 3 forbids the heap and there is no FILE* on bare metal, so src/ and libs/ carry no such pattern. The host tools under tools/ do, which is why the gap only surfaces once tools/ comes under the cppcheck gate.

This header maps the keyword to the classic null pointer constant for the analyser only. It is passed with --include= (a cppcheck-exclusive flag), so no real compiler ever sees it and the shipped code keeps the C23 keyword. The #define is unconditional on purpose: guarding it behind #ifdef __CPPCHECK__ would make cppcheck explore the guard both ways and re-surface the false positives in the undefined configuration, and passing -Dnullptr=NULL on the command line would disable cppcheck's automatic configuration exploration (which src/, libs/ and the examples rely on for their #ifdef-selected build variants). A force-included header is the only mechanism that reaches every configuration without collapsing them.

Note

Never #include this from first-party code; it exists solely as the gate's --include= argument.

Copyright

Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Since

0.1.0

Definition in file cppcheck_c23_compat.h.

Macro Definition Documentation

nullptr

#define nullptr   ((void*)0)

Definition at line 38 of file cppcheck_c23_compat.h.

Referenced by ble_npl_event_get_arg(), internal_bind(), internal_mdl_fetch_prepare_page(), and mdl_robots_cache_consult().