/* memcmp -- compare two memory regions.   This function is in the public domain.  */ /* @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, @  size_t @var{count}) Compares the first @var{count} bytes of two areas of memory.  Returnszero if they are the same, a value less than zero if @var{x} islexically less than @var{y}, or a value greater than zero if @var{x}is lexically greater than @var{y}.  Note that lexical order is determinedas if comparing unsigned char arrays. @end deftypefn */ #include <ansidecl.h>#include <stddef.h> intmemcmp (const void *str1, const void *str2, size_t count){  register const unsigned char *s1 = (const unsigned char*)str1;  register const unsigned char *s2 = (const unsigned char*)str2;   while (count-- > 0)    {      if (*s1++ != *s2++)	  return s1[-1] < s2[-1] ? -1 : 1;    }  return 0;}