Merge pull request nanochess#9 from humbertocsjr/master

ALIGN command implemented from NASM

Author: nanochess

TINYASM.EXE

@@ -1299,6 +1299,7 @@ void do_assembly(fname)
     int base;
     int pline;
     int include;
+    int align;
 
     input = fopen(fname, "r");
     if (input == NULL) {
@@ -1555,6 +1556,24 @@ void do_assembly(fname)
                 }
                 break;
             }
+            if (strcmp(part, "ALIGN") == 0) {
+                p = avoid_spaces(p);
+                undefined = 0;
+                p2 = match_expression(p, &instruction_value);
+                if (p2 == NULL) {
+                    message(1, "Bad expression");
+                } else if (undefined) {
+                    message(1, "Cannot use undefined labels");
+                } else {
+                    align = address / instruction_value;
+                    align = align * instruction_value;
+                    align = align + instruction_value;
+		    while (address < align)
+		        emit_byte(0x90);
+                    check_end(p2);
+                }
+                break;
+            }
             if (first_time == 1) {
 #ifdef DEBUG
                 /*fprintf(stderr, "First time '%s' at line %d\n", line, line_number);*/