[PATCH] maint: add a syntax check to prevent use of NULL

[Pádraig Brady]

* cfg.mk (sc_prohibit_NULL): Direct to use nullptr instead.
---
 cfg.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cfg.mk b/cfg.mk
index 9c399595f..630251b65 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -509,6 +509,12 @@ sc_prohibit_exit_write_error:
        halt='Use write_error() instead' \
          $(_sc_search_regexp)
 
+sc_prohibit_NULL:
+       @prohibit='$(begword)NULL$(endword)'                            \
+       in_vc_files='\.[ch]$$'                                          \
+       halt='use nullptr instead'                                      \
+         $(_sc_search_regexp)
+
 # Don't use "indent-tabs-mode: nil" anymore.  No longer needed.
 sc_prohibit_emacs__indent_tabs_mode__setting:
        @prohibit='^( *[*#] *)?indent-tabs-mode:'                       \
-- 
2.41.0