From db37956d3b98b27726035286afc4dd2fd13506b5 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Mon, 22 May 2023 22:49:26 +0100
Subject: Fix line parsing

WIP: needs better error reporting
---
 tr8as.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

(limited to 'tr8as.c')

diff --git a/tr8as.c b/tr8as.c
index 43a2534..8e9fc1b 100644
--- a/tr8as.c
+++ b/tr8as.c
@@ -1299,7 +1299,7 @@ static uint8_t parse_dec(As *as, char **c)
     uint8_t wlen;
     uint8_t r1;
 
-    /* INC r1 */
+    /* DEC r1 */
     if (!next_word(as, c, word, &wlen))
         return 0;
 
@@ -1667,16 +1667,19 @@ static uint8_t parse(As *as, char *c)
     uint8_t wlen;
     uint8_t i;
 
+    c = skip_whitespace(c);
+
+    /* comment */
+    if (*c == ';')
+        return 1;
+
     if (!next_word(as, &c, word, &wlen))
         return 0;
 
+    /* empty line */
     if (wlen == 0)
         return 1;
 
-    /* comment */
-    if (word[0] == ';')
-        return 1;
-
     /* new label */
     if (*c == ':')
     {
@@ -1686,7 +1689,7 @@ static uint8_t parse(As *as, char *c)
     }
     else
     {
-        /* instructions */
+        /* instruction */
         for (i = 0; insts[i].parse; i++)
             if (!strcasecmp(insts[i].id, word))
             {
@@ -1699,18 +1702,19 @@ static uint8_t parse(As *as, char *c)
             return error_l("Parse error", &as->loc, word);
     }
 
-    /* EOL */
-    if (!next_word(as, &c, word, &wlen))
-        return 0;
+    /* can be followed by a comment or EOL */
 
-    if (wlen == 0)
+    c = skip_whitespace(c);
+
+    /* comment */
+    if (*c == ';')
         return 1;
 
-    /* or comment */
-    if (word[0] == ';')
+    /* EOL */
+    if (!*c)
         return 1;
 
-    return error_l("Parse error", &as->loc, word);
+    return error_l("Parse error", &as->loc, "expected end of line");
 }
 
 static uint8_t asm(As *as, const char *filename, FILE *in)
-- 
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