-
-/* Subnet mask handling */
-
-int maskcmp(const void *va, const void *vb, int masklen) {
- int i, m, result;
- const char *a = va;
- const char *b = vb;
-
- cp();
-
- for(m = masklen, i = 0; m >= 8; m -= 8, i++) {
- result = a[i] - b[i];
- if(result)
- return result;
- }
-
- if(m)
- return (a[i] & (0x100 - (1 << (8 - m)))) -
- (b[i] & (0x100 - (1 << (8 - m))));
-
- return 0;
-}
-
-void mask(void *va, int masklen, int len) {
- int i;
- char *a = va;
-
- cp();
-
- i = masklen / 8;
- masklen %= 8;
-
- if(masklen)
- a[i++] &= (0x100 - (1 << (8 - masklen)));
-
- for(; i < len; i++)
- a[i] = 0;
-}
-
-void maskcpy(void *va, const void *vb, int masklen, int len) {
- int i, m;
- char *a = va;
- const char *b = vb;
-
- cp();
-
- for(m = masklen, i = 0; m >= 8; m -= 8, i++)
- a[i] = b[i];
-
- if(m) {
- a[i] = b[i] & (0x100 - (1 << (8 - m)));
- i++;
- }
-
- for(; i < len; i++)
- a[i] = 0;
-}
-
-bool maskcheck(const void *va, int masklen, int len) {
- int i;
- const char *a = va;
-
- cp();
-
- i = masklen / 8;
- masklen %= 8;
-
- if(masklen && a[i++] & (0xff >> masklen))
- return false;
-
- for(; i < len; i++)
- if(a[i] != 0)
- return false;
-
- return true;
-}