regex_internal.c: don't assume WEOF fits in wchar_t

ChangeLog

@@ -1,5 +1,9 @@
 2010-01-22  Jim Meyering  <jim@meyering.net>
 
+	[BZ #11186]
+	* posix/regex_internal.c (re_string_skip_chars): Don't assume WEOF
+	fits in wchar_t.  Problem reported by Eric Blake.
+
 	[BZ #11185]
 	* posix/regex_internal.c (re_string_reconstruct): Remove declaration
 	and stores into set-but-not-used local, "q".

posix/regex_internal.c

@@ -489,16 +489,16 @@ re_string_skip_chars (re_string_t *pstr, int new_raw_idx, wint_t *last_wc)
   mbstate_t prev_st;
   int rawbuf_idx;
   size_t mbclen;
-  wchar_t wc = WEOF;
+  wint_t wc = WEOF;
 
   /* Skip the characters which are not necessary to check.  */
   for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_raw_len;
        rawbuf_idx < new_raw_idx;)
     {
-      int remain_len;
-      remain_len = pstr->len - rawbuf_idx;
+      wchar_t wc2;
+      int remain_len = pstr->len - rawbuf_idx;
       prev_st = pstr->cur_state;
-      mbclen = __mbrtowc (&wc, (const char *) pstr->raw_mbs + rawbuf_idx,
+      mbclen = __mbrtowc (&wc2, (const char *) pstr->raw_mbs + rawbuf_idx,
 			  remain_len, &pstr->cur_state);
       if (BE (mbclen == (size_t) -2 || mbclen == (size_t) -1 || mbclen == 0, 0))
 	{
@@ -510,10 +510,12 @@ re_string_skip_chars (re_string_t *pstr, int new_raw_idx, wint_t *last_wc)
 	  mbclen = 1;
 	  pstr->cur_state = prev_st;
 	}
+      else
+	wc = (wint_t) wc2;
       /* Then proceed the next character.  */
       rawbuf_idx += mbclen;
     }
-  *last_wc = (wint_t) wc;
+  *last_wc = wc;
   return rawbuf_idx;
 }
 #endif /* RE_ENABLE_I18N  */