- if (subject.length!=-1) key.character=string_cat(key.character,&capacity,&key.length,subject.character,subject.length);
- if (from.length!=-1) key.character=string_cat(key.character,&capacity,&key.length,from.character,from.length);
- key.character=string_cat(key.character,&capacity,&key.length,reason_is_mime?US"1":US"0",1);
- key.character=string_cat(key.character,&capacity,&key.length,reason.character,reason.length);
+ if (subject.length!=-1) key.character=string_catn(key.character,&capacity,&key.length,subject.character,subject.length);
+ if (from.length!=-1) key.character=string_catn(key.character,&capacity,&key.length,from.character,from.length);
+ key.character=string_catn(key.character,&capacity,&key.length,reason_is_mime?US"1":US"0",1);
+ key.character=string_catn(key.character,&capacity,&key.length,reason.character,reason.length);