text: #ifndef BANNED_H
  #define BANNED_H
  
  /*
   * This header lists functions that have been banned from our code base,
   * because they're too easy to misuse (and even if used correctly,
   * complicate audits). Including this header turns them into compile-time
   * errors.
   */
  
  #define BANNED(func) sorry_##func##_is_a_banned_function
  
  #undef strcpy
  #define strcpy(x,y) BANNED(strcpy)
  #undef strcat
  #define strcat(x,y) BANNED(strcat)
  #undef strncpy
  #define strncpy(x,y,n) BANNED(strncpy)
  #undef strncat
  #define strncat(x,y,n) BANNED(strncat)
  
  #undef sprintf
  #undef vsprintf
  #ifdef HAVE_VARIADIC_MACROS
  #define sprintf(...) BANNED(sprintf)
  #define vsprintf(...) BANNED(vsprintf)
  #else
  #define sprintf(buf,fmt,arg) BANNED(sprintf)
  #define vsprintf(buf,fmt,arg) BANNED(sprintf)
  #endif
  
  #endif /* BANNED_H */
  