bind/cocci/set_if_not_null.spatch

@@
type T;
identifier fun;
identifier arg;
expression val;
@@
	fun(..., T *arg, ...) {
		...
-		if (arg != NULL) {
-				*arg = val;
-		}
+		SET_IF_NOT_NULL(arg, val);
		...
	}
A SET_IF_NOT_NULL() macro for optional return values The SET_IF_NOT_NULL() macro avoids a fair amount of tedious boilerplate, checking pointer parameters to see if they're non-NULL and updating them if they are. The macro was already in the dns_zone unit, and this commit moves it to the <isc/util.h> header. I have included a Coccinelle semantic patch to use SET_IF_NOT_NULL() where appropriate. The patch needs an #include in `openssl_shim.c` in order to work. 2023-04-06 11:30:00 +01:00			`@@`
			`type T;`
			`identifier fun;`
			`identifier arg;`
			`expression val;`
			`@@`
			`fun(..., T *arg, ...) {`
			`...`
			`- if (arg != NULL) {`
			`- *arg = val;`
			`- }`
			`+ SET_IF_NOT_NULL(arg, val);`
			`...`
			`}`