1*1debfc3dSmrg /* memcmp -- compare two memory regions. 2*1debfc3dSmrg This function is in the public domain. */ 3*1debfc3dSmrg 4*1debfc3dSmrg /* 5*1debfc3dSmrg 6*1debfc3dSmrg @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, @ 7*1debfc3dSmrg size_t @var{count}) 8*1debfc3dSmrg 9*1debfc3dSmrg Compares the first @var{count} bytes of two areas of memory. Returns 10*1debfc3dSmrg zero if they are the same, a value less than zero if @var{x} is 11*1debfc3dSmrg lexically less than @var{y}, or a value greater than zero if @var{x} 12*1debfc3dSmrg is lexically greater than @var{y}. Note that lexical order is determined 13*1debfc3dSmrg as if comparing unsigned char arrays. 14*1debfc3dSmrg 15*1debfc3dSmrg @end deftypefn 16*1debfc3dSmrg 17*1debfc3dSmrg */ 18*1debfc3dSmrg 19*1debfc3dSmrg #include <ansidecl.h> 20*1debfc3dSmrg #include <stddef.h> 21*1debfc3dSmrg 22*1debfc3dSmrg int memcmp(const PTR str1,const PTR str2,size_t count)23*1debfc3dSmrgmemcmp (const PTR str1, const PTR str2, size_t count) 24*1debfc3dSmrg { 25*1debfc3dSmrg register const unsigned char *s1 = (const unsigned char*)str1; 26*1debfc3dSmrg register const unsigned char *s2 = (const unsigned char*)str2; 27*1debfc3dSmrg 28*1debfc3dSmrg while (count-- > 0) 29*1debfc3dSmrg { 30*1debfc3dSmrg if (*s1++ != *s2++) 31*1debfc3dSmrg return s1[-1] < s2[-1] ? -1 : 1; 32*1debfc3dSmrg } 33*1debfc3dSmrg return 0; 34*1debfc3dSmrg } 35*1debfc3dSmrg 36