The code does unsafe things in signal handlers (vfprintf, for example), and hides some things in macros that I wouldn't expect to see hidden (like the assignmen

The code does unsafe things in signal handlers (vfprintf, for example), and hides some things in macros that I wouldn't expect to see hidden (like the assignment of the global "argv0" variable, defined in st.c, is assigned in a macro from arg.h).