From bce616eaf0b6ca508876ec8a87c87c4b6a93db55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andy=20Teijelo=20P=C3=A9rez?= <ateijelo@gmail.com>
Date: Thu, 15 Sep 2016 14:35:32 -0400
Subject: [PATCH] Check for dupes in msx2utf8, to avoid last commit's bug

---
 msx2utf8.py | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/msx2utf8.py b/msx2utf8.py
index 8fee05e..90eeabd 100755
--- a/msx2utf8.py
+++ b/msx2utf8.py
@@ -27,10 +27,17 @@ def msxchars():
     for i in range(65,96):
         yield (256 + i, chars[160 + i])
 
-charmap = {}
+msx2uni = {}
+uni2msx = {}
 
 for m,c in msxchars():
-    charmap[m] = c
+    if m in msx2uni:
+        raise ValueError("MSX code {} is duplicated".format(m))
+    msx2uni[m] = c
+    if c in uni2msx:
+        raise ValueError("Codepoint {} ({}) is duplicated"
+                .format(ord(c), c))
+    uni2msx[c] = m
 
 if len(sys.argv) < 2:
     while True:
@@ -44,7 +51,7 @@ if len(sys.argv) < 2:
                 sys.stdout.write('\x01')
                 break
             code = 256 + c[0]
-        char = charmap[code]
+        char = msx2uni[code]
         sys.stdout.write(char)
 
 if sys.argv[1] == '-l':