improve iswdigit macro to diagnose errors

this is analogous to commit 2ca55a93f2a11185d72dcb69006fd2c30b5c3144
for the macros in ctype.h.

diff --git a/include/wchar.h b/include/wchar.h
index ad727a8..0167dce 100644 (file)
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -175,7 +175,7 @@ wctype_t  wctype(const char *);
 
 #ifndef __cplusplus
 #undef iswdigit
-#define iswdigit(a) ((unsigned)(a)-'0' < 10)
+#define iswdigit(a) (0 ? iswdigit(a) : ((unsigned)(a)-'0') < 10)
 #endif
 #endif
 

diff --git a/include/wctype.h b/include/wctype.h
index 3da1219..bc2420d 100644 (file)
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -45,7 +45,7 @@ wctype_t  wctype(const char *);
 
 #ifndef __cplusplus
 #undef iswdigit
-#define iswdigit(a) (((unsigned)(a)-L'0') < 10)
+#define iswdigit(a) (0 ? iswdigit(a) : ((unsigned)(a)-'0') < 10)
 #endif
 
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \