* posix/regex_internal.c (re_string_skip_chars): If no character has

	been converted at all, set *last_wc to WEOF.  If mbrtowc failed, set wc
	to the byte which couldn't be converted.
	(re_string_reconstruct): Don't clear valid_raw_len before calling
	re_string_skip_chars.  If wc is WEOF after re_string_skip_chars, set
	tip_context using re_string_context_at.
	* posix/Makefile: Add rules to build and run bug-regex25 test.
	* posix/bug-regex25.c: New test.

1 files changed, 17 insertions, 9 deletions

diff --git a/posix/regex_internal.c b/posix/regex_internal.c
index 855497ebf1..ac312db0cd 100644
--- a/posix/regex_internal.c
+++ b/posix/regex_internal.c
@@ -482,7 +482,7 @@ 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 = 0;
+  wchar_t wc = WEOF;
 
   /* Skip the characters which are not necessary to check.  */
   for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_raw_len;
@@ -495,7 +495,11 @@ re_string_skip_chars (re_string_t *pstr, int new_raw_idx, wint_t *last_wc)
 			remain_len, &pstr->cur_state);
       if (BE (mbclen == (size_t) -2 || mbclen == (size_t) -1 || mbclen == 0, 0))
 	{
-	  /* We treat these cases as a singlebyte character.  */
+	  /* We treat these cases as a single byte character.  */
+	  if (mbclen == 0 || remain_len == 0)
+	    wc = L'\0';
+	  else
+	    wc = *(unsigned char *) (pstr->raw_mbs + rawbuf_idx);
 	  mbclen = 1;
 	  pstr->cur_state = prev_st;
 	}
@@ -618,7 +622,6 @@ re_string_reconstruct (re_string_t *pstr, int idx, int eflags)
 	    }
 #endif
 	  pstr->valid_len = 0;
-	  pstr->valid_raw_len = 0;
 #ifdef RE_ENABLE_I18N
 	  if (pstr->mb_cur_max > 1)
 	    {
@@ -681,6 +684,16 @@ re_string_reconstruct (re_string_t *pstr, int idx, int eflags)
 
 	      if (wc == WEOF)
 		pstr->valid_len = re_string_skip_chars (pstr, idx, &wc) - idx;
+	      if (wc == WEOF)
+		pstr->tip_context
+		  = re_string_context_at (pstr, pstr->valid_raw_len - 1, eflags);
+	      else
+		pstr->tip_context = ((BE (pstr->word_ops_used != 0, 0)
+				      && IS_WIDE_WORD_CHAR (wc))
+				     ? CONTEXT_WORD
+				     : ((IS_WIDE_NEWLINE (wc)
+					 && pstr->newline_anchor)
+					? CONTEXT_NEWLINE : 0));
 	      if (BE (pstr->valid_len, 0))
 		{
 		  for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
@@ -689,17 +702,12 @@ re_string_reconstruct (re_string_t *pstr, int idx, int eflags)
 		    memset (pstr->mbs, 255, pstr->valid_len);
 		}
 	      pstr->valid_raw_len = pstr->valid_len;
-	      pstr->tip_context = ((BE (pstr->word_ops_used != 0, 0)
-				    && IS_WIDE_WORD_CHAR (wc))
-				   ? CONTEXT_WORD
-				   : ((IS_WIDE_NEWLINE (wc)
-				       && pstr->newline_anchor)
-				      ? CONTEXT_NEWLINE : 0));
 	    }
 	  else
 #endif /* RE_ENABLE_I18N */
 	    {
 	      int c = pstr->raw_mbs[pstr->raw_mbs_idx + offset - 1];
+	      pstr->valid_raw_len = 0;
 	      if (pstr->trans)
 		c = pstr->trans[c];
 	      pstr->tip_context = (bitset_contain (pstr->word_char, c)