diff --git a/src/modal.c b/src/modal.c
index 688020c..c5db6cf 100644
--- a/src/modal.c
+++ b/src/modal.c
@@ -1,10 +1,11 @@
 #include <stdio.h>
 
 typedef struct {
+	int id;
 	char *a, *b;
 } Rule;
 
-static int rules_len, direction;
+static int direction;
 static Rule rules[0x1000], *rules_ = rules;
 static char dict[0x8000], *dict_ = dict;
 static char bank_a[0x4000], *prog_ = bank_a;
@@ -108,7 +109,7 @@ match_rule(char *p, Rule *r)
 }
 
 static int
-commit_rule(int rule, char *s)
+commit_rule(Rule *r, char *s)
 {
 	while((*outp_++ = *s++))
 		;
@@ -117,8 +118,8 @@ commit_rule(int rule, char *s)
 		prog_ = bank_b, outp_ = bank_a;
 	else
 		prog_ = bank_a, outp_ = bank_b;
-	if(rule >= 0)
-		fprintf(stderr, "%02d %s\n", rule, prog_);
+	if(r != NULL)
+		fprintf(stderr, "%02d %s\n", r->id, prog_);
 	return 1;
 }
 
@@ -138,13 +139,12 @@ add_rule(char *p)
 {
 	char c;
 	Rule *r = rules_++;
-	rules_len++;
 	p += 2;
 	while((c = *p) && c <= ' ') p++;
 	r->a = parse_rule(p), p = walk(p);
 	while((c = *p) && c <= ' ') p++;
 	r->b = parse_rule(p), p = walk(p);
-	return commit_rule(-1, p);
+	return commit_rule(NULL, p);
 }
 
 static int
@@ -156,9 +156,8 @@ rewrite(void)
 		if(p[0] == '<' && p[1] == '>')
 			return add_rule(p);
 		if(spacer(last)) {
-			int i;
-			for(i = 0; i < rules_len; i++) {
-				Rule *r = &rules[i];
+			Rule *r;
+			for(r = rules; r < rules_; r++) {
 				char *res = match_rule(p, r);
 				if(res != NULL) {
 					char cc, *b = r->b;
@@ -169,7 +168,7 @@ rewrite(void)
 						else
 							*outp_++ = cc;
 					}
-					return commit_rule(i, res);
+					return commit_rule(r, res);
 				}
 			}
 		}
@@ -183,9 +182,9 @@ rewrite(void)
 static void
 print_rules(void)
 {
-	Rule *r = rules;
+	Rule *r;
 	fprintf(stderr, "\n");
-	while(r++ < rules_)
+	for(r = rules; r < rules_; r++)
 		fprintf(stderr, "<> (%s) (%s)\n", r->a, r->b);
 	fprintf(stderr, "\n");
 }