Enable UTF8 in gnulib regexp.

* config.h.in (RE_ENABLE_I18N) [!GRUB_UTIL]: New define.
	* grub-core/lib/posix_wrap/ctype.h (islower): Use grub_islower.
	(isupper): Use grub_isupper.
	(isascii): New inline function.
	* grub-core/lib/posix_wrap/wchar.h: Replace dummy with real contents.
	* grub-core/lib/posix_wrap/wctype.h: Likewise.
	* grub-core/normal/charset.c (grub_utf8_process): New function.
	(grub_utf8_to_utf16): Use grub_utf8_process.
	(grub_encode_utf8_character): New function.
	(grub_ucs4_to_utf8): Use grub_encode_utf8_character.
	* include/grub/charset.h (grub_utf8_process): New declaration.
	(grub_encode_utf8_character): Likewise.
	* include/grub/misc.h (grub_islower): New inline function.
	(grub_isupper): Likewise.
	(grub_strchrsub): Moved down to fix the definitions.

include/grub/charset.h

@@ -126,11 +126,22 @@ grub_is_valid_utf8 (const grub_uint8_t *src, grub_size_t srcsize);
 
 int grub_utf8_to_ucs4_alloc (const char *msg, grub_uint32_t **unicode_msg,
 			     grub_uint32_t **last_position);
+
+/* Process one character from UTF8 sequence. 
+   At beginning set *code = 0, *count = 0. Returns 0 on failure and
+   1 on success. *count holds the number of trailing bytes.  */
+int
+grub_utf8_process (grub_uint8_t c, grub_uint32_t *code, int *count);
+
 void
 grub_ucs4_to_utf8 (grub_uint32_t *src, grub_size_t size,
 		   grub_uint8_t *dest, grub_size_t destsize);
 grub_size_t grub_utf8_to_ucs4 (grub_uint32_t *dest, grub_size_t destsize,
 			       const grub_uint8_t *src, grub_size_t srcsize,
 			       const grub_uint8_t **srcend);
+/* Returns -2 if not enough space, -1 on invalid character.  */
+grub_ssize_t
+grub_encode_utf8_character (grub_uint8_t *dest, grub_uint8_t *destend,
+			    grub_uint32_t code);
 
 #endif

include/grub/misc.h

@@ -175,6 +175,18 @@ grub_isalpha (int c)
   return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
 }
 
+static inline int
+grub_islower (int c)
+{
+  return (c >= 'a' && c <= 'z');
+}
+
+static inline int
+grub_isupper (int c)
+{
+  return (c >= 'A' && c <= 'Z');
+}
+
 static inline int
 grub_isgraph (int c)
 {
@@ -250,27 +262,6 @@ grub_strncasecmp (const char *s1, const char *s2, grub_size_t n)
   return (int) grub_tolower (*s1) - (int) grub_tolower (*s2);
 }
 
-/* Replace all `ch' characters of `input' with `with' and copy the
-   result into `output'; return EOS address of `output'. */
-static inline char *
-grub_strchrsub (char *output, const char *input, char ch, const char *with)
-{
-  grub_size_t grub_strlen (const char *s);
-  while (*input)
-    {
-      if (*input == ch)
-	{
-	  grub_strcpy (output, with);
-	  output += grub_strlen (with);
-	  input++;
-	  continue;
-	}
-      *output++ = *input++;
-    }
-  *output = '\0';
-  return output;
-}
-
 unsigned long EXPORT_FUNC(grub_strtoul) (const char *str, char **end, int base);
 unsigned long long EXPORT_FUNC(grub_strtoull) (const char *str, char **end, int base);
 
@@ -317,6 +308,26 @@ grub_size_t EXPORT_FUNC(grub_strlen) (const char *s) __attribute__ ((warn_unused
 int EXPORT_FUNC(grub_printf) (const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 int EXPORT_FUNC(grub_printf_) (const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 
+/* Replace all `ch' characters of `input' with `with' and copy the
+   result into `output'; return EOS address of `output'. */
+static inline char *
+grub_strchrsub (char *output, const char *input, char ch, const char *with)
+{
+  while (*input)
+    {
+      if (*input == ch)
+	{
+	  grub_strcpy (output, with);
+	  output += grub_strlen (with);
+	  input++;
+	  continue;
+	}
+      *output++ = *input++;
+    }
+  *output = '\0';
+  return output;
+}
+
 extern void (*EXPORT_VAR (grub_xputs)) (const char *str);
 
 static inline int