From b518d1407149a23d31b486f5bd3ef9e6daae93c1 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 20 Mar 2003 13:00:56 -0300
Subject: bug: zio mixes a 255 as first char in a buffer with EOZ

---
 bugs   | 5 +++++
 lzio.c | 6 +++---
 lzio.h | 9 +++++----
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/bugs b/bugs
index e39ae780..89ec20db 100644
--- a/bugs
+++ b/bugs
@@ -329,3 +329,8 @@ Fri Feb 28 14:20:33 EST 2003
 >> GC metamethod calls could mess C/Lua stack syncronization
 (by Roberto; since 5.0b)
 
+** lzio.h/zlio.c
+Thu Mar 20 11:40:12 EST 2003
+>> zio mixes a 255 as first char in a buffer with EOZ
+(by lhf; since 5.0a)
+
diff --git a/lzio.c b/lzio.c
index 19e05c5c..ed14abc6 100644
--- a/lzio.c
+++ b/lzio.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lzio.c,v 1.22 2002/10/08 18:46:08 roberto Exp roberto $
+** $Id: lzio.c,v 1.23 2002/12/04 17:38:31 roberto Exp roberto $
 ** a generic input stream interface
 ** See Copyright Notice in lua.h
 */
@@ -22,7 +22,7 @@ int luaZ_fill (ZIO *z) {
   if (buff == NULL || size == 0) return EOZ;
   z->n = size - 1;
   z->p = buff;
-  return *(z->p++);
+  return char2int(*(z->p++));
 }
 
 
@@ -33,7 +33,7 @@ int luaZ_lookahead (ZIO *z) {
     z->n++;
     z->p--;
   }
-  return *z->p;
+  return char2int(*z->p);
 }
 
 
diff --git a/lzio.h b/lzio.h
index f2fbad90..2637eb1b 100644
--- a/lzio.h
+++ b/lzio.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lzio.h,v 1.13 2002/08/05 18:45:02 roberto Exp roberto $
+** $Id: lzio.h,v 1.14 2002/10/08 18:46:08 roberto Exp roberto $
 ** Buffered streams
 ** See Copyright Notice in lua.h
 */
@@ -15,9 +15,10 @@
 
 typedef struct Zio ZIO;
 
-#define zgetc(z)  (((z)->n--)>0 ? \
-			cast(int, cast(unsigned char, *(z)->p++)) : \
-			luaZ_fill(z))
+
+#define char2int(c)	cast(int, cast(unsigned char, (c)))
+
+#define zgetc(z)  (((z)->n--)>0 ?  char2int(*(z)->p++) : luaZ_fill(z))
 
 #define zname(z)	((z)->name)
 
-- 
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