root/lib/libc/memcmp.c

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DEFINITIONS

This source file includes following definitions.
  1. memcmp

   1 /* memcmp -- compare two memory regions.
   2    This function is in the public domain.  */
   3 
   4 /*
   5 
   6 @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, size_t @var{count})
   7 
   8 Compares the first @var{count} bytes of two areas of memory.  Returns
   9 zero if they are the same, a value less than zero if @var{x} is
  10 lexically less than @var{y}, or a value greater than zero if @var{x}
  11 is lexically greater than @var{y}.  Note that lexical order is determined
  12 as if comparing unsigned char arrays.
  13 
  14 @end deftypefn
  15 
  16 */
  17 
  18 int
  19 memcmp (const void * str1, const void * str2, long count)
  20 {
  21   register const unsigned char *s1 = (const unsigned char*)str1;
  22   register const unsigned char *s2 = (const unsigned char*)str2;
  23 
  24   while (count-- > 0)
  25     {
  26       if (*s1++ != *s2++)
  27           return s1[-1] < s2[-1] ? -1 : 1;
  28     }
  29   return 0;
  30 }
  31 

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