1 files changed, 18 insertions, 10 deletions

diff --git a/lctype.h b/lctype.h
index db233b87..4569ec28 100644
--- a/lctype.h
+++ b/lctype.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lctype.h,v 1.3 2009/03/10 17:42:33 roberto Exp roberto $
+** $Id: lctype.h,v 1.4 2009/03/11 13:27:32 roberto Exp roberto $
 ** 'ctype' functions for Lua
 ** See Copyright Notice in lua.h
 */
@@ -23,16 +23,24 @@
 #define MASK(B)         (1 << (B))
 
 
-/* 'lalpha' (Lua alphabetic) includes '_' */
-#define lislalpha(x)    (luai_ctype_[x] & MASK(ALPHABIT))
-/* ditto */
-#define lislalnum(x)    (luai_ctype_[x] & (MASK(ALPHABIT) | MASK(DIGITBIT)))
-#define lisdigit(x)     (luai_ctype_[x] & MASK(DIGITBIT))
-#define lisspace(x)     (luai_ctype_[x] & MASK(SPACEBIT))
-#define lisprint(x)     (luai_ctype_[x] & MASK(PRINTBIT))
-#define lisxdigit(x)    (luai_ctype_[x] & MASK(XDIGITBIT))
+/*
+** add 1 to char to allow index -1 (EOZ)
+*/
+#define testprop(c,p)   (luai_ctype_[(c)+1] & (p))
+
+/*
+** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
+*/
+#define lislalpha(c)    testprop(c, MASK(ALPHABIT))
+#define lislalnum(c)    testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
+#define lisdigit(c)     testprop(c, MASK(DIGITBIT))
+#define lisspace(c)     testprop(c, MASK(SPACEBIT))
+#define lisprint(c)     testprop(c, MASK(PRINTBIT))
+#define lisxdigit(c)    testprop(c, MASK(XDIGITBIT))
+
 
-LUAI_DATA const char luai_ctype_[UCHAR_MAX + 1];
+/* one more entry for 0 and one more for -1 (EOZ) */
+LUAI_DATA const char luai_ctype_[UCHAR_MAX + 2];
 
 #endif