Why is snprintf deactivated by default in legacy libc? (Wieschebrock)

This is probably more of a question to Calum - In the stdio.h that comes with the compiler, it says: #if _ADDED_C_LIB
int snprintf(char *, size_t, const char *, ...);
int vsnprintf(char *, size_t, const char *, _Va_list);
#endif /* _ADDE..