diff --git a/include/ChangeLog b/include/ChangeLog
index 1e321f470..d26ba1d4e 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2003-06-21  Zack Weinberg  <zack@codesourcery.com>
+
+	* safe-ctype.h (HC_UNKNOWN, HC_ASCII, HC_EBCDIC, HOST_CHARSET):
+	New #defines.
+
 2003-06-17  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* ansidecl.h: Delete HAVE_LONG_DOUBLE GCC bootstrap support.
diff --git a/include/safe-ctype.h b/include/safe-ctype.h
index b2ad8490b..c3e154c6f 100644
--- a/include/safe-ctype.h
+++ b/include/safe-ctype.h
@@ -37,7 +37,24 @@ Boston, MA 02111-1307, USA.  */
 
 #ifdef isalpha
  #error "safe-ctype.h and ctype.h may not be used simultaneously"
+#endif
+
+/* Determine host character set.  */
+#define HC_UNKNOWN 0
+#define HC_ASCII   1
+#define HC_EBCDIC  2
+
+#if  '\n' == 0x0A && ' ' == 0x20 && '0' == 0x30 \
+   && 'A' == 0x41 && 'a' == 0x61 && '!' == 0x21
+#  define HOST_CHARSET HC_ASCII
 #else
+# if '\n' == 0x15 && ' ' == 0x40 && '0' == 0xF0 \
+   && 'A' == 0xC1 && 'a' == 0x81 && '!' == 0x5A
+#  define HOST_CHARSET HC_EBCDIC
+# else
+#  define HOST_CHARSET HC_UNKNOWN
+# endif
+#endif
 
 /* Categories.  */
 
@@ -99,5 +116,4 @@ extern const unsigned char  _sch_tolower[256];
 #define TOUPPER(c) _sch_toupper[(c) & 0xff]
 #define TOLOWER(c) _sch_tolower[(c) & 0xff]
 
-#endif /* no ctype.h */
 #endif /* SAFE_CTYPE_H */