From 436e579df4d830ac32e703171a00e78e75eab629 Mon Sep 17 00:00:00 2001
From: Devine Lu Linvega <aliceffekt@gmail.com>
Date: Sun, 25 Aug 2024 10:18:44 -0700
Subject: [PATCH] (uxnasm) Check against label/macro overlaps

---
 src/uxnasm.c | 38 +++++++++++++++++++++-----------------
 1 file changed, 21 insertions(+), 17 deletions(-)

diff --git a/src/uxnasm.c b/src/uxnasm.c
index a1d06fb..89b726a 100644
--- a/src/uxnasm.c
+++ b/src/uxnasm.c
@@ -22,7 +22,7 @@ typedef struct { int line; char *path; } Context;
 typedef struct { char *name, rune, *data; Uint16 addr, refs, line; } Item;
 
 static int ptr, length;
-static char token[0x40], scope[0x40], lambda[0x05];
+static char token[0x30], scope[0x40], lambda[0x05];
 static char dict[0x8000], *dictnext = dict;
 static Uint8 data[0x10000], lambda_stack[0x100], lambda_ptr, lambda_len;
 static Uint16 labels_len, refs_len, macro_len;
@@ -123,14 +123,16 @@ static int
 walkmacro(Item *m, Context *ctx)
 {
 	unsigned char c;
-	char *dataptr = m->data, *cptr = token;
+	char *dataptr = m->data, *_token = token;
 	while((c = *dataptr++)) {
 		if(c < 0x21) {
-			*cptr++ = 0x00;
+			*_token++ = 0x00;
 			if(token[0] && !parse(token, NULL, ctx)) return 0;
-			cptr = token;
-		} else
-			*cptr++ = c;
+			_token = token;
+		} else if(_token - token < 0x2f)
+			*_token++ = c;
+		else
+			return error_asm("Token size exceeded");
 	}
 	return 1;
 }
@@ -139,19 +141,19 @@ static int
 walkfile(FILE *f, Context *ctx)
 {
 	unsigned char c;
-	char *cptr = token;
+	char *_token = token;
 	while(f && fread(&c, 1, 1, f)) {
 		if(c < 0x21) {
-			*cptr++ = 0x00;
+			*_token++ = 0x00;
 			if(token[0] && !parse(token, f, ctx)) return 0;
 			if(c == 0xa) ctx->line++;
-			cptr = token;
-		} else if(cptr - token < 0x3f)
-			*cptr++ = c;
+			_token = token;
+		} else if(_token - token < 0x2f)
+			*_token++ = c;
 		else
-			return error_asm("Token too long");
+			return error_asm("Token size exceeded");
 	}
-	*cptr++ = 0;
+	*_token++ = 0;
 	return parse(token, f, ctx);
 }
 
@@ -172,8 +174,9 @@ makemacro(char *name, FILE *f, Context *ctx)
 	char c;
 	Item *m;
 	if(macro_len >= 0x100) return error_asm("Macros limit exceeded");
-	if(isinvalid(name)) return error_asm("Macro is invalid");
-	if(findmacro(name)) return error_asm("Macro is duplicate");
+	if(isinvalid(name)) return error_asm("Macro invalid");
+	if(findmacro(name)) return error_asm("Macro duplicate");
+	if(findlabel(name)) return error_asm("Label duplicate");
 	m = &macros[macro_len++];
 	m->name = push(name, 0);
 	m->data = dictnext;
@@ -201,6 +204,7 @@ makelabel(char *name, int setscope, Context *ctx)
 		name = join(scope, '/', name + 1);
 	if(labels_len >= 0x400) return error_asm("Labels limit exceeded");
 	if(isinvalid(name)) return error_asm("Label invalid");
+	if(findmacro(name)) return error_asm("Label duplicate");
 	if(findlabel(name)) return error_asm("Label duplicate");
 	l = &labels[labels_len++];
 	l->name = push(name, 0);
@@ -294,7 +298,7 @@ assemble(char *filename)
 	ctx.line = 1;
 	ctx.path = push(filename, 0);
 	if(!(f = fopen(filename, "r")))
-		return error_top("Source missing", filename);
+		return error_top("File missing", filename);
 	res = walkfile(f, &ctx);
 	fclose(f);
 	return res;
@@ -348,7 +352,7 @@ resolve(char *filename)
 		case ',':
 			*rom = rel = l->addr - r->addr - 2;
 			if((Sint8)data[r->addr] != rel)
-				return error_ref("Relative reference too far");
+				return error_ref("Reference too far");
 			break;
 		case '-':
 		case '.':