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strstartswith.h

#ifndef STRSTARTSWITH_H_
#define STRSTARTSWITH_H_

// From http://blogs.msdn.com/b/the1/archive/2004/05/07/128242.aspx

#ifndef __GNUC__
template <typename T, size_t N>
  char ( &_ArraySizeHelper( T (&array)[N] ))[N];
#define countof(array) (sizeof(_ArraySizeHelper(array)))
#else
template <class T>
  class _ArraySizeHelper {};
template <class T, size_t N>
class _ArraySizeHelper<T[N]> {
  public:
    static const size_t value = N;
};
#define countof(x) (_ArraySizeHelper<typeof(x)>::value)
#endif  // __GNUC__

#define strstartswith(str1, str2) strncmp(str1, str2, countof(str2) - 1)

#endif  // STRSTARTSWITH_H_