char *ret;
int i,j;
- if ((st == NULL) || (st->num == 0) || (loc < 0)
- || (loc >= st->num)) return(NULL);
+ if(!st || (loc < 0) || (loc >= st->num)) return NULL;
ret=st->data[loc];
if (loc != st->num-1)
char *sk_value(const STACK *st, int i)
{
- if(st == NULL) return NULL;
+ if(!st || (i < 0) || (i >= st->num)) return NULL;
return st->data[i];
}
char *sk_set(STACK *st, int i, char *value)
{
- if(st == NULL) return NULL;
+ if(!st || (i < 0) || (i >= st->num)) return NULL;
return (st->data[i] = value);
}
st->sorted=1;
}
}
+
+int sk_is_sorted(const STACK *st)
+ {
+ if (!st)
+ return 1;
+ return st->sorted;
+ }