bad_way.c

#include "interface.h"

void initialize(void)
{
  puts("Common Initialize\n");

#if   defined(PLATFORM_A)
  puts("Initialize A\n");
#elif defined(PLATFORM_B)
  puts("Initialize B\n");
#else
  #error "Invalid platform."
#endif
}

void do_stuff(void)
{
  puts("Common Do Stuff\n");

#if   defined(PLATFORM_A)
  puts("Do Stuff A\n");
#elif defined(PLATFORM_B)
  puts("Do Stuff B\n");
#else
  #error "Invalid platform."
#endif
}

void cleanup(void)
{
  puts("Common Cleanup\n");

#if   defined(PLATFORM_A)
  puts("Cleanup A\n");
#elif defined(PLATFORM_B)
  puts("Cleanup B\n");
#else
  #error "Invalid platform."
#endif
}