From 2a73f95e7204ded74409adc03eeac62868e3500f Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Mon, 17 Jun 2024 17:05:51 -0400
Subject: cxrefbas: handle IF <x> THEN <lineno>.

---
 Makefile     |  2 +-
 bas.h        |  1 +
 cxrefbas.1   |  4 +++-
 cxrefbas.c   | 19 ++++++++++++++++++-
 cxrefbas.rst |  2 ++
 5 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index d49b400..f64b99c 100644
--- a/Makefile
+++ b/Makefile
@@ -64,7 +64,7 @@ cxrefbas: bas.o bcdfp.o
 bas.o: bas.c bas.h
 
 subdirs:
-	for dir in $(SUBDIRS); do make -C $$dir COPT=$(COPT); done
+	for dir in $(SUBDIRS); do make -C $$dir COPT="$(COPT)"; done
 
 a8eol: a8eol.c
 
diff --git a/bas.h b/bas.h
index 4e30431..dd75e19 100644
--- a/bas.h
+++ b/bas.h
@@ -38,6 +38,7 @@
 #define CMD_ON       0x1e
 #define CMD_GOSUB    0x0c
 #define CMD_TRAP     0x0d
+#define CMD_IF       0x07
 #define CMD_LIST     0x04
 #define CMD_RESTORE  0x23
 #define CMD_REM      0x00
diff --git a/cxrefbas.1 b/cxrefbas.1
index 8cfb9ac..99870a2 100644
--- a/cxrefbas.1
+++ b/cxrefbas.1
@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "CXREFBAS" 1 "2024-06-16" "0.2.1" "Urchlay's Atari 8-bit Tools"
+.TH "CXREFBAS" 1 "2024-06-17" "0.2.1" "Urchlay's Atari 8-bit Tools"
 .SH NAME
 cxrefbas \- Code cross-reference for tokenized Atari 8-bit BASIC files
 .SH SYNOPSIS
@@ -46,6 +46,8 @@ is no line 100), it\(aqs printed in the table, prefixed with \fI!\fP\&.
 Any command that uses a computed value for a line number will print a
 warning on standard error, e.g. \fIGOTO A\fP or \fIGOSUB 100*A\fP\&. Even \fIGOTO
 100+0\fP is a computed value, since BASIC doesn\(aqt do constant folding.
+.sp
+Line numbers above 32767, e.g. \fITRAP 40000\fP, are not listed.
 .SH OPTIONS
 .SS General Options
 .INDENT 0.0
diff --git a/cxrefbas.c b/cxrefbas.c
index 7cc3114..9228f28 100644
--- a/cxrefbas.c
+++ b/cxrefbas.c
@@ -8,6 +8,14 @@
 #include "bas.h"
 #include "bcdfp.h"
 
+/* not yet...
+typedef struct {
+	unsigned short lineno;
+	unsigned short pos;
+	unsigned char type;
+} lineref_t;
+*/
+
 unsigned short *linerefs[32769];
 int refcounts[32769];
 int lines_exist[32769];
@@ -79,6 +87,10 @@ void computed_msg(unsigned short lineno) {
 			cmd = "RESTORE"; break;
 		case CMD_TRAP:
 			cmd = "TRAP"; break;
+			/*
+		case CMD_IF:
+			cmd = "IF/THEN"; break;
+			*/
 		case CMD_ON:
 			if(on_op == OP_GOSUB)
 				cmd = "ON/GOSUB";
@@ -107,6 +119,7 @@ CALLBACK(got_var) {
 }
 
 CALLBACK(got_exp) {
+	unsigned char last_tok = program[pos - 1];
 	int standalone;
 
 	if(last_cmd == CMD_ON) {
@@ -129,8 +142,12 @@ CALLBACK(got_exp) {
 				computed_msg(lineno);
 			}
 			break;
+		case CMD_IF:
+			if(last_tok == OP_THEN) {
+				add_lineref(lineno, fp2int(program + pos + 1));
+			}
+			break;
 		case CMD_ON: {
-				unsigned char last_tok = program[pos - 1];
 				switch(last_tok) {
 					case OP_GOTO:
 					case OP_GOSUB:
diff --git a/cxrefbas.rst b/cxrefbas.rst
index b32cdb0..2bba3f7 100644
--- a/cxrefbas.rst
+++ b/cxrefbas.rst
@@ -28,6 +28,8 @@ Any command that uses a computed value for a line number will print a
 warning on standard error, e.g. *GOTO A* or *GOSUB 100\*A*. Even *GOTO
 100+0* is a computed value, since BASIC doesn't do constant folding.
 
+Line numbers above 32767, e.g. *TRAP 40000*, are not listed.
+
 OPTIONS
 =======
 
-- 
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