# HG changeset patch
# User Jim Meyering <meyering@redhat.com>
# Date 1337956729 -7200
# Node ID cb54ca844f1c260d6a82a8033aad7b9e65706d04
# Parent  29f5ac75cf9e1e15b7438535ecf0004cb0dcfd7b
maint.mk: add strncpy-prohibiting syntax-check rule

* top/maint.mk (sc_prohibit_strncpy): New rule, from coreutils.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-05-25  Jim Meyering  <meyering@redhat.com>
+
+	maint.mk: add strncpy-prohibiting syntax-check rule
+	* top/maint.mk (sc_prohibit_strncpy): New rule, from coreutils.
+
 2012-05-24  Jim Meyering  <meyering@redhat.com>
 
 	maint.mk: compute $(gpg_key_ID) more portably
diff --git a/top/maint.mk b/top/maint.mk
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -332,6 +332,14 @@
 	halt='$(ME): replace strcmp calls above with STREQ/STRNEQ'	\
 	  $(_sc_search_regexp)
 
+# Really.  You don't want to use this function.
+# It may fail to NUL-terminate the destination,
+# and always NUL-pads out to the specified length.
+sc_prohibit_strncpy:
+	@prohibit='\<strncpy *\('					\
+	halt='do not use strncpy, period'				\
+	  $(_sc_search_regexp)
+
 # Pass EXIT_*, not number, to usage, exit, and error (when exiting)
 # Convert all uses automatically, via these two commands:
 # git grep -l '\<exit *(1)' \