| /* 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. Returns |
| zero if they are the same, a value less than zero if @var{x} is |
| lexically less than @var{y}, or a value greater than zero if @var{x} |
| is lexically greater than @var{y}. Note that lexical order is determined |
| as if comparing unsigned char arrays. |
| |
| @end deftypefn |
| |
| */ |
| |
| #include <ansidecl.h> |
| #include <stddef.h> |
| |
| int |
| memcmp (const PTR str1, const PTR 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; |
| } |
| |