14fee23f9Smrg /* memcmp -- compare two memory regions. 24fee23f9Smrg This function is in the public domain. */ 34fee23f9Smrg 44fee23f9Smrg /* 54fee23f9Smrg 6*48fb7bfaSmrg @deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, @ 7*48fb7bfaSmrg size_t @var{count}) 84fee23f9Smrg 94fee23f9Smrg Compares the first @var{count} bytes of two areas of memory. Returns 104fee23f9Smrg zero if they are the same, a value less than zero if @var{x} is 114fee23f9Smrg lexically less than @var{y}, or a value greater than zero if @var{x} 124fee23f9Smrg is lexically greater than @var{y}. Note that lexical order is determined 134fee23f9Smrg as if comparing unsigned char arrays. 144fee23f9Smrg 154fee23f9Smrg @end deftypefn 164fee23f9Smrg 174fee23f9Smrg */ 184fee23f9Smrg 194fee23f9Smrg #include <ansidecl.h> 204fee23f9Smrg #include <stddef.h> 214fee23f9Smrg 224fee23f9Smrg int memcmp(const PTR str1,const PTR str2,size_t count)234fee23f9Smrgmemcmp (const PTR str1, const PTR str2, size_t count) 244fee23f9Smrg { 254fee23f9Smrg register const unsigned char *s1 = (const unsigned char*)str1; 264fee23f9Smrg register const unsigned char *s2 = (const unsigned char*)str2; 274fee23f9Smrg 284fee23f9Smrg while (count-- > 0) 294fee23f9Smrg { 304fee23f9Smrg if (*s1++ != *s2++) 314fee23f9Smrg return s1[-1] < s2[-1] ? -1 : 1; 324fee23f9Smrg } 334fee23f9Smrg return 0; 344fee23f9Smrg } 354fee23f9Smrg 36