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-rw-r--r--include/ctype.h11
-rw-r--r--include/wctype.h11
2 files changed, 22 insertions, 0 deletions
diff --git a/include/ctype.h b/include/ctype.h
index 4896d14f17..ae38b1bf23 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -68,4 +68,15 @@ __ctype_tolower_loc (void)
# include <ctype/ctype.h>
+# if !defined __NO_CTYPE && !defined NOT_IN_libc
+/* The spec says that isdigit must only match the decimal digits. We
+ can check this without a memory access. */
+# undef isdigit
+# define isdigit(c) ({ int __c = (c); __c >= '0' && __c <= '9'; })
+# undef isdigit_l
+# define isdigit_l(c, l) ({ int __c = (c); __c >= '0' && __c <= '9'; })
+# undef __isdigit_l
+# define __isdigit_l(c, l) ({ int __c = (c); __c >= '0' && __c <= '9'; })
+# endif
+
#endif /* ctype.h */
diff --git a/include/wctype.h b/include/wctype.h
index a2d5e18f31..2828c3ad3d 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -84,4 +84,15 @@ libc_hidden_proto (__iswxdigit_l)
libc_hidden_proto (__towlower_l)
libc_hidden_proto (__towupper_l)
+/* The spec says that isdigit must only match the decimal digits. We
+ can check this without a memory access. */
+# ifndef NOT_IN_libc
+# undef iswdigit
+# define iswdigit(c) ({ wint_t __c = (c); __c >= L'0' && __c <= L'9'; })
+# undef iswdigit_l
+# define iswdigit_l(c, l) ({ wint_t __c = (c); __c >= L'0' && __c <= L'9'; })
+# undef __iswdigit_l
+# define __iswdigit_l(c, l) ({ wint_t __c = (c); __c >= L'0' && __c <= L'9'; })
+# endif
+
#endif