Update.

	* misc/mntent_r.c (decode_name): Fix decoding of tab, add decoding
	of newline.
	* manual/sysinfo.texi (mtab): Adjust description accordingly.
	Reported by Andries.Brouwer@cwi.nl.

1 files changed, 341 insertions, 119 deletions

diff --git a/posix/regex_internal.c b/posix/regex_internal.c
index f78ec79e65..1fd3e164ef 100644
--- a/posix/regex_internal.c
+++ b/posix/regex_internal.c
@@ -62,17 +62,14 @@ re_string_allocate (pstr, str, len, init_len, trans, icase, dfa)
     init_len = dfa->mb_cur_max;
   init_buf_len = (len + 1 < init_len) ? len + 1: init_len;
   re_string_construct_common (str, len, pstr, trans, icase, dfa);
-  pstr->stop = pstr->len;
 
   ret = re_string_realloc_buffers (pstr, init_buf_len);
   if (BE (ret != REG_NOERROR, 0))
     return ret;
 
-  pstr->mbs_case = (MBS_CASE_ALLOCATED (pstr) ? pstr->mbs_case
-		    : (unsigned char *) str);
-  pstr->mbs = MBS_ALLOCATED (pstr) ? pstr->mbs : pstr->mbs_case;
-  pstr->valid_len = (MBS_CASE_ALLOCATED (pstr) || MBS_ALLOCATED (pstr)
-		     || dfa->mb_cur_max > 1) ? pstr->valid_len : len;
+  pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
+  pstr->valid_len = (pstr->mbs_allocated || dfa->mb_cur_max > 1) ? 0 : len;
+  pstr->valid_raw_len = pstr->valid_len;
   return REG_NOERROR;
 }
 
@@ -88,9 +85,6 @@ re_string_construct (pstr, str, len, trans, icase, dfa)
 {
   reg_errcode_t ret;
   re_string_construct_common (str, len, pstr, trans, icase, dfa);
-  pstr->stop = pstr->len;
-  /* Set 0 so that this function can initialize whole buffers.  */
-  pstr->valid_len = 0;
 
   if (len > 0)
     {
@@ -98,15 +92,27 @@ re_string_construct (pstr, str, len, trans, icase, dfa)
       if (BE (ret != REG_NOERROR, 0))
 	return ret;
     }
-  pstr->mbs_case = (MBS_CASE_ALLOCATED (pstr) ? pstr->mbs_case
-		    : (unsigned char *) str);
-  pstr->mbs = MBS_ALLOCATED (pstr) ? pstr->mbs : pstr->mbs_case;
+  pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
 
   if (icase)
     {
 #ifdef RE_ENABLE_I18N
       if (dfa->mb_cur_max > 1)
-	build_wcs_upper_buffer (pstr);
+	{
+	  while (1)
+	    {
+	      ret = build_wcs_upper_buffer (pstr);
+	      if (BE (ret != REG_NOERROR, 0))
+		return ret;
+	      if (pstr->valid_raw_len >= len)
+		break;
+	      if (pstr->bufs_len > pstr->valid_len + dfa->mb_cur_max)
+		break;
+	      ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
+	      if (BE (ret != REG_NOERROR, 0))
+		return ret;
+	    }
+	}
       else
 #endif /* RE_ENABLE_I18N  */
 	build_upper_buffer (pstr);
@@ -122,12 +128,13 @@ re_string_construct (pstr, str, len, trans, icase, dfa)
 	  if (trans != NULL)
 	    re_string_translate_buffer (pstr);
 	  else
-	    pstr->valid_len = len;
+	    {
+	      pstr->valid_len = pstr->bufs_len;
+	      pstr->valid_raw_len = pstr->bufs_len;
+	    }
 	}
     }
 
-  /* Initialized whole buffers, then valid_len == bufs_len.  */
-  pstr->valid_len = pstr->bufs_len;
   return REG_NOERROR;
 }
 
@@ -145,9 +152,16 @@ re_string_realloc_buffers (pstr, new_buf_len)
       if (BE (new_array == NULL, 0))
 	return REG_ESPACE;
       pstr->wcs = new_array;
+      if (pstr->offsets != NULL)
+	{
+	  int *new_array = re_realloc (pstr->offsets, int, new_buf_len);
+	  if (BE (new_array == NULL, 0))
+	    return REG_ESPACE;
+	  pstr->offsets = new_array;
+	}
     }
 #endif /* RE_ENABLE_I18N  */
-  if (MBS_ALLOCATED (pstr))
+  if (pstr->mbs_allocated)
     {
       unsigned char *new_array = re_realloc (pstr->mbs, unsigned char,
 					     new_buf_len);
@@ -155,16 +169,6 @@ re_string_realloc_buffers (pstr, new_buf_len)
 	return REG_ESPACE;
       pstr->mbs = new_array;
     }
-  if (MBS_CASE_ALLOCATED (pstr))
-    {
-      unsigned char *new_array = re_realloc (pstr->mbs_case, unsigned char,
-					     new_buf_len);
-      if (BE (new_array == NULL, 0))
-	return REG_ESPACE;
-      pstr->mbs_case = new_array;
-      if (!MBS_ALLOCATED (pstr))
-	pstr->mbs = pstr->mbs_case;
-    }
   pstr->bufs_len = new_buf_len;
   return REG_NOERROR;
 }
@@ -182,11 +186,15 @@ re_string_construct_common (str, len, pstr, trans, icase, dfa)
   memset (pstr, '\0', sizeof (re_string_t));
   pstr->raw_mbs = (const unsigned char *) str;
   pstr->len = len;
+  pstr->raw_len = len;
   pstr->trans = trans;
   pstr->icase = icase ? 1 : 0;
+  pstr->mbs_allocated = (trans != NULL || icase);
   pstr->mb_cur_max = dfa->mb_cur_max;
   pstr->is_utf8 = dfa->is_utf8;
   pstr->map_notascii = dfa->map_notascii;
+  pstr->stop = pstr->len;
+  pstr->raw_stop = pstr->stop;
 }
 
 #ifdef RE_ENABLE_I18N
@@ -206,18 +214,39 @@ static void
 build_wcs_buffer (pstr)
      re_string_t *pstr;
 {
+#ifdef _LIBC
+  unsigned char buf[pstr->mb_cur_max];
+#else
+  unsigned char buf[64];
+#endif
   mbstate_t prev_st;
   int byte_idx, end_idx, mbclen, remain_len;
+
   /* Build the buffers from pstr->valid_len to either pstr->len or
      pstr->bufs_len.  */
-  end_idx = (pstr->bufs_len > pstr->len)? pstr->len : pstr->bufs_len;
+  end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
   for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
     {
       wchar_t wc;
+      const char *p;
+
       remain_len = end_idx - byte_idx;
       prev_st = pstr->cur_state;
-      mbclen = mbrtowc (&wc, ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
-			      + byte_idx), remain_len, &pstr->cur_state);
+      /* Apply the translation if we need.  */
+      if (BE (pstr->trans != NULL, 0))
+	{
+	  int i, ch;
+
+	  for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
+	    {
+	      ch = pstr->raw_mbs [pstr->raw_mbs_idx + byte_idx + i];
+	      buf[i] = pstr->trans[ch];
+	    }
+	  p = (const char *) buf;
+	}
+      else
+	p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx;
+      mbclen = mbrtowc (&wc, p, remain_len, &pstr->cur_state);
       if (BE (mbclen == (size_t) -2, 0))
 	{
 	  /* The buffer doesn't have enough space, finish to build.  */
@@ -229,15 +258,11 @@ build_wcs_buffer (pstr)
 	  /* We treat these cases as a singlebyte character.  */
 	  mbclen = 1;
 	  wc = (wchar_t) pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
+	  if (BE (pstr->trans != NULL, 0))
+	    wc = pstr->trans[wc];
 	  pstr->cur_state = prev_st;
 	}
 
-      /* Apply the translation if we need.  */
-      if (pstr->trans != NULL && mbclen == 1)
-	{
-	  int ch = pstr->trans[pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]];
-	  pstr->mbs_case[byte_idx] = ch;
-	}
       /* Write wide character and padding.  */
       pstr->wcs[byte_idx++] = wc;
       /* Write paddings.  */
@@ -245,61 +270,83 @@ build_wcs_buffer (pstr)
 	pstr->wcs[byte_idx++] = WEOF;
     }
   pstr->valid_len = byte_idx;
+  pstr->valid_raw_len = byte_idx;
 }
 
 /* Build wide character buffer PSTR->WCS like build_wcs_buffer,
    but for REG_ICASE.  */
 
-static void
+static int
 build_wcs_upper_buffer (pstr)
      re_string_t *pstr;
 {
   mbstate_t prev_st;
-  int byte_idx, end_idx, mbclen, remain_len;
-  /* Build the buffers from pstr->valid_len to either pstr->len or
-     pstr->bufs_len.  */
-  end_idx = (pstr->bufs_len > pstr->len)? pstr->len : pstr->bufs_len;
+  int src_idx, byte_idx, end_idx, mbclen, remain_len;
+#ifdef _LIBC
+  unsigned char buf[pstr->mb_cur_max];
+#else
+  unsigned char buf[64];
+#endif
+
+  byte_idx = pstr->valid_len;
+  end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
 
 #ifdef _LIBC
   /* The following optimization assumes that the wchar_t encoding is
      always ISO 10646.  */
-  if (! pstr->map_notascii && pstr->trans == NULL)
-    for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
-      if (isascii (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx])
-	  && mbsinit (&pstr->cur_state))
-	{
-	  /* In case of a singlebyte character.  */
-	  pstr->mbs[byte_idx]
-	    = toupper (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]);
-	  /* The next step uses the assumption that wchar_t is encoded
-	     with ISO 10646: all ASCII values can be converted like this.  */
-	  pstr->wcs[byte_idx] = (wchar_t) pstr->mbs[byte_idx];
-	  ++byte_idx;
-	}
-      else
+  if (! pstr->map_notascii && pstr->trans == NULL && !pstr->offsets_needed)
+    {
+      while (byte_idx < end_idx)
 	{
 	  wchar_t wc;
+
+	  if (isascii (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx])
+	      && mbsinit (&pstr->cur_state))
+	    {
+	      /* In case of a singlebyte character.  */
+	      pstr->mbs[byte_idx]
+		= toupper (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]);
+	      /* The next step uses the assumption that wchar_t is encoded
+		 with ISO 10646: all ASCII values can be converted like
+		 this.  */
+	      pstr->wcs[byte_idx] = (wchar_t) pstr->mbs[byte_idx];
+	      ++byte_idx;
+	      continue;
+	    }
+
 	  remain_len = end_idx - byte_idx;
 	  prev_st = pstr->cur_state;
 	  mbclen = mbrtowc (&wc,
 			    ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
 			     + byte_idx), remain_len, &pstr->cur_state);
-	  if (BE (mbclen > 1, 1))
+	  if (BE (mbclen > 0, 1))
 	    {
+	      wchar_t wcu = wc;
 	      if (iswlower (wc))
-		wcrtomb ((char *) pstr->mbs + byte_idx, towupper (wc),
-			 &prev_st);
+		{
+		  int mbcdlen;
+
+		  wcu = towupper (wc);
+		  mbcdlen = wcrtomb (buf, wcu, &prev_st);
+		  if (BE (mbclen == mbcdlen, 1))
+		    memcpy (pstr->mbs + byte_idx, buf, mbclen);
+		  else
+		    {
+		      src_idx = byte_idx;
+		      goto offsets_needed;
+		    }
+		}
 	      else
 		memcpy (pstr->mbs + byte_idx,
 			pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx, mbclen);
-	      pstr->wcs[byte_idx++] = towupper (wc);
+	      pstr->wcs[byte_idx++] = wcu;
 	      /* Write paddings.  */
 	      for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
 		pstr->wcs[byte_idx++] = WEOF;
 	    }
 	  else if (mbclen == (size_t) -1 || mbclen == 0)
 	    {
-	      /* It is an invalid character.  Just use the byte.  */
+	      /* It is an invalid character or '\0'.  Just use the byte.  */
 	      int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
 	      pstr->mbs[byte_idx] = ch;
 	      /* And also cast it to wide char.  */
@@ -314,48 +361,116 @@ build_wcs_upper_buffer (pstr)
 	      break;
 	    }
 	}
+      pstr->valid_len = byte_idx;
+      pstr->valid_raw_len = byte_idx;
+      return REG_NOERROR;
+    }
   else
 #endif
-    for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
+    for (src_idx = pstr->valid_raw_len; byte_idx < end_idx;)
       {
 	wchar_t wc;
+	const char *p;
+offsets_needed:
 	remain_len = end_idx - byte_idx;
 	prev_st = pstr->cur_state;
-	mbclen = mbrtowc (&wc,
-			  ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
-			   + byte_idx), remain_len, &pstr->cur_state);
-	if (mbclen == 1)
+	if (BE (pstr->trans != NULL, 0))
 	  {
-	    /* In case of a singlebyte character.  */
-	    int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
-	    /* Apply the translation if we need.  */
-	    if (BE (pstr->trans != NULL, 0) && mbclen == 1)
+	    int i, ch;
+
+	    for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
 	      {
-		ch = pstr->trans[ch];
-		pstr->mbs_case[byte_idx] = ch;
+		ch = pstr->raw_mbs [pstr->raw_mbs_idx + src_idx + i];
+		buf[i] = pstr->trans[ch];
 	      }
-	    pstr->wcs[byte_idx] = towupper (wc);
-	    pstr->mbs[byte_idx++] = toupper (ch);
-	    if (BE (mbclen == (size_t) -1, 0))
-	      pstr->cur_state = prev_st;
+	    p = (const char *) buf;
 	  }
-	else if (BE (mbclen != (size_t) -2, 1))
+	else
+	  p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + src_idx;
+	mbclen = mbrtowc (&wc, p, remain_len, &pstr->cur_state);
+	if (BE (mbclen > 0, 1))
 	  {
+	    wchar_t wcu = wc;
 	    if (iswlower (wc))
-	      wcrtomb ((char *) pstr->mbs + byte_idx, towupper (wc), &prev_st);
+	      {
+		int mbcdlen;
+
+		wcu = towupper (wc);
+		mbcdlen = wcrtomb (buf, wcu, &prev_st);
+		if (BE (mbclen == mbcdlen, 1))
+		  memcpy (pstr->mbs + byte_idx, buf, mbclen);
+		else
+		  {
+		    int i;
+
+		    if (byte_idx + mbcdlen > pstr->bufs_len)
+		      {
+			pstr->cur_state = prev_st;
+			break;
+		      }
+
+		    if (pstr->offsets == NULL)
+		      {
+			pstr->offsets = re_malloc (int, pstr->bufs_len);
+
+			if (pstr->offsets == NULL)
+			  return REG_ESPACE;
+		      }
+		    if (!pstr->offsets_needed)
+		      {
+			for (i = 0; i < byte_idx; ++i)
+			  pstr->offsets[i] = i;
+			pstr->offsets_needed = 1;
+		      }
+
+		    memcpy (pstr->mbs + byte_idx, buf, mbcdlen);
+		    pstr->wcs[byte_idx] = wcu;
+		    pstr->offsets[byte_idx] = src_idx;
+		    for (i = 1; i < mbcdlen; ++i)
+		      {
+			pstr->offsets[byte_idx + i]
+			  = src_idx + (i < mbclen ? i : mbclen - 1);
+			pstr->wcs[byte_idx + i] = WEOF;
+		      }
+		    pstr->len += mbcdlen - mbclen;
+		    if (pstr->raw_stop > src_idx)
+		      pstr->stop += mbcdlen - mbclen;
+		    end_idx = (pstr->bufs_len > pstr->len)
+			      ? pstr->len : pstr->bufs_len;
+		    byte_idx += mbcdlen;
+		    src_idx += mbclen;
+		    continue;
+		  }
+	      }
 	    else
-	      memcpy (pstr->mbs + byte_idx,
-		      pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx, mbclen);
-	    pstr->wcs[byte_idx++] = towupper (wc);
+	      memcpy (pstr->mbs + byte_idx, p, mbclen);
+
+	    if (BE (pstr->offsets_needed != 0, 0))
+	      {
+		int i;
+		for (i = 0; i < mbclen; ++i)
+		  pstr->offsets[byte_idx + i] = src_idx + i;
+	      }
+	    src_idx += mbclen;
+
+	    pstr->wcs[byte_idx++] = wcu;
 	    /* Write paddings.  */
 	    for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
 	      pstr->wcs[byte_idx++] = WEOF;
 	  }
 	else if (mbclen == (size_t) -1 || mbclen == 0)
 	  {
-	    /* It is an invalid character.  Just use the byte.  */
-	    int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
+	    /* It is an invalid character or '\0'.  Just use the byte.  */
+	    int ch = pstr->raw_mbs[pstr->raw_mbs_idx + src_idx];
+
+	    if (BE (pstr->trans != NULL, 0))
+	      ch = pstr->trans [ch];
 	    pstr->mbs[byte_idx] = ch;
+
+	    if (BE (pstr->offsets_needed != 0, 0))
+	      pstr->offsets[byte_idx] = src_idx;
+	    ++src_idx;
+
 	    /* And also cast it to wide char.  */
 	    pstr->wcs[byte_idx++] = (wchar_t) ch;
 	    if (BE (mbclen == (size_t) -1, 0))
@@ -369,6 +484,8 @@ build_wcs_upper_buffer (pstr)
 	  }
       }
   pstr->valid_len = byte_idx;
+  pstr->valid_raw_len = src_idx;
+  return REG_NOERROR;
 }
 
 /* Skip characters until the index becomes greater than NEW_RAW_IDX.
@@ -385,7 +502,7 @@ re_string_skip_chars (pstr, new_raw_idx, last_wc)
   wchar_t wc = 0;
 
   /* Skip the characters which are not necessary to check.  */
-  for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_len;
+  for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_raw_len;
        rawbuf_idx < new_raw_idx;)
     {
       int remain_len;
@@ -420,17 +537,15 @@ build_upper_buffer (pstr)
   for (char_idx = pstr->valid_len; char_idx < end_idx; ++char_idx)
     {
       int ch = pstr->raw_mbs[pstr->raw_mbs_idx + char_idx];
-      if (pstr->trans != NULL)
-	{
-	  ch = pstr->trans[ch];
-	  pstr->mbs_case[char_idx] = ch;
-	}
+      if (BE (pstr->trans != NULL, 0))
+	ch = pstr->trans[ch];
       if (islower (ch))
 	pstr->mbs[char_idx] = toupper (ch);
       else
 	pstr->mbs[char_idx] = ch;
     }
   pstr->valid_len = char_idx;
+  pstr->valid_raw_len = char_idx;
 }
 
 /* Apply TRANS to the buffer in PSTR.  */
@@ -445,10 +560,11 @@ re_string_translate_buffer (pstr)
   for (buf_idx = pstr->valid_len; buf_idx < end_idx; ++buf_idx)
     {
       int ch = pstr->raw_mbs[pstr->raw_mbs_idx + buf_idx];
-      pstr->mbs_case[buf_idx] = pstr->trans[ch];
+      pstr->mbs[buf_idx] = pstr->trans[ch];
     }
 
   pstr->valid_len = buf_idx;
+  pstr->valid_raw_len = buf_idx;
 }
 
 /* This function re-construct the buffers.
@@ -468,14 +584,15 @@ re_string_reconstruct (pstr, idx, eflags, newline)
       if (pstr->mb_cur_max > 1)
 	memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
 #endif /* RE_ENABLE_I18N */
-      pstr->len += pstr->raw_mbs_idx;
-      pstr->stop += pstr->raw_mbs_idx;
-      pstr->valid_len = pstr->raw_mbs_idx = 0;
+      pstr->len = pstr->raw_len;
+      pstr->stop = pstr->raw_stop;
+      pstr->valid_len = 0;
+      pstr->raw_mbs_idx = 0;
+      pstr->valid_raw_len = 0;
+      pstr->offsets_needed = 0;
       pstr->tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
 			   : CONTEXT_NEWLINE | CONTEXT_BEGBUF);
-      if (!MBS_CASE_ALLOCATED (pstr))
-	pstr->mbs_case = (unsigned char *) pstr->raw_mbs;
-      if (!MBS_ALLOCATED (pstr) && !MBS_CASE_ALLOCATED (pstr))
+      if (!pstr->mbs_allocated)
 	pstr->mbs = (unsigned char *) pstr->raw_mbs;
       offset = idx;
     }
@@ -483,7 +600,13 @@ re_string_reconstruct (pstr, idx, eflags, newline)
   if (offset != 0)
     {
       /* Are the characters which are already checked remain?  */
-      if (offset < pstr->valid_len)
+      if (offset < pstr->valid_raw_len
+#ifdef RE_ENABLE_I18N
+	  /* Handling this would enlarge the code too much.
+	     Accept a slowdown in that case.  */
+	  && pstr->offsets_needed == 0
+#endif
+	 )
 	{
 	  /* Yes, move them to the front of the buffer.  */
 	  pstr->tip_context = re_string_context_at (pstr, offset - 1, eflags,
@@ -493,13 +616,11 @@ re_string_reconstruct (pstr, idx, eflags, newline)
 	    memmove (pstr->wcs, pstr->wcs + offset,
 		     (pstr->valid_len - offset) * sizeof (wint_t));
 #endif /* RE_ENABLE_I18N */
-	  if (MBS_ALLOCATED (pstr))
+	  if (pstr->mbs_allocated)
 	    memmove (pstr->mbs, pstr->mbs + offset,
 		     pstr->valid_len - offset);
-	  if (MBS_CASE_ALLOCATED (pstr))
-	    memmove (pstr->mbs_case, pstr->mbs_case + offset,
-		     pstr->valid_len - offset);
 	  pstr->valid_len -= offset;
+	  pstr->valid_raw_len -= offset;
 #if DEBUG
 	  assert (pstr->valid_len > 0);
 #endif
@@ -507,16 +628,26 @@ re_string_reconstruct (pstr, idx, eflags, newline)
       else
 	{
 	  /* No, skip all characters until IDX.  */
+#ifdef RE_ENABLE_I18N
+	  if (BE (pstr->offsets_needed, 0))
+	    {
+	      pstr->len = pstr->raw_len - idx + offset;
+	      pstr->stop = pstr->raw_stop - idx + offset;
+	      pstr->offsets_needed = 0;
+	    }
+#endif
 	  pstr->valid_len = 0;
+	  pstr->valid_raw_len = 0;
 #ifdef RE_ENABLE_I18N
 	  if (pstr->mb_cur_max > 1)
 	    {
 	      int wcs_idx;
 	      wint_t wc = WEOF;
 
+#ifdef _LIBC
 	      if (pstr->is_utf8)
 		{
-		  const unsigned char *raw, *p, *end;
+		  const unsigned char *raw, *p, *q, *end;
 
 		  /* Special case UTF-8.  Multi-byte chars start with any
 		     byte other than 0x80 - 0xbf.  */
@@ -527,13 +658,22 @@ re_string_reconstruct (pstr, idx, eflags, newline)
 		      {
 			mbstate_t cur_state;
 			wchar_t wc2;
-			int mlen;
+			int mlen = raw + pstr->len - p;
+			unsigned char buf[6];
 
+			q = p;
+			if (BE (pstr->trans != NULL, 0))
+			  {
+			    int i = mlen < 6 ? mlen : 6;
+			    while (--i >= 0)
+			      buf[i] = pstr->trans[p[i]];
+			    q = buf;
+			  }
 			/* XXX Don't use mbrtowc, we know which conversion
 			   to use (UTF-8 -> UCS4).  */
 			memset (&cur_state, 0, sizeof (cur_state));
-			mlen = mbrtowc (&wc2, p, raw + pstr->len - p,
-					&cur_state) - (raw + offset - p);
+			mlen = mbrtowc (&wc2, p, mlen, &cur_state)
+			       - (raw + offset - p);
 			if (mlen >= 0)
 			  {
 			    memset (&pstr->cur_state, '\0',
@@ -544,12 +684,17 @@ re_string_reconstruct (pstr, idx, eflags, newline)
 			break;
 		      }
 		}
+#endif
 	      if (wc == WEOF)
 		pstr->valid_len = re_string_skip_chars (pstr, idx, &wc) - idx;
-	      for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
-		pstr->wcs[wcs_idx] = WEOF;
-	      if (pstr->trans && wc <= 0xff)
-		wc = pstr->trans[wc];
+	      if (BE (pstr->valid_len, 0))
+		{
+		  for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
+		    pstr->wcs[wcs_idx] = WEOF;
+		  if (pstr->mbs_allocated)
+		    memset (pstr->mbs, 255, pstr->valid_len);
+		}
+	      pstr->valid_raw_len = pstr->valid_len;
 	      pstr->tip_context = (IS_WIDE_WORD_CHAR (wc) ? CONTEXT_WORD
 				   : ((newline && IS_WIDE_NEWLINE (wc))
 				      ? CONTEXT_NEWLINE : 0));
@@ -565,13 +710,8 @@ re_string_reconstruct (pstr, idx, eflags, newline)
 				      ? CONTEXT_NEWLINE : 0));
 	    }
 	}
-      if (!MBS_CASE_ALLOCATED (pstr))
-	{
-	  pstr->mbs_case += offset;
-	  /* In case of !MBS_ALLOCATED && !MBS_CASE_ALLOCATED.  */
-	  if (!MBS_ALLOCATED (pstr))
-	    pstr->mbs += offset;
-	}
+      if (!pstr->mbs_allocated)
+	pstr->mbs += offset;
     }
   pstr->raw_mbs_idx = idx;
   pstr->len -= offset;
@@ -582,7 +722,11 @@ re_string_reconstruct (pstr, idx, eflags, newline)
   if (pstr->mb_cur_max > 1)
     {
       if (pstr->icase)
-	build_wcs_upper_buffer (pstr);
+	{
+	  int ret = build_wcs_upper_buffer (pstr);
+	  if (BE (ret != REG_NOERROR, 0))
+	    return ret;
+	}
       else
 	build_wcs_buffer (pstr);
     }
@@ -601,17 +745,95 @@ re_string_reconstruct (pstr, idx, eflags, newline)
   return REG_NOERROR;
 }
 
+static unsigned char
+re_string_peek_byte_case (const re_string_t *pstr,
+			  int idx)
+{
+  int ch, off;
+
+  /* Handle the common (easiest) cases first.  */
+  if (BE (!pstr->icase, 1))
+    return re_string_peek_byte (pstr, idx);
+
+#ifdef RE_ENABLE_I18N
+  if (pstr->mb_cur_max > 1
+      && ! re_string_is_single_byte_char (pstr, pstr->cur_idx + idx))
+    return re_string_peek_byte (pstr, idx);
+#endif
+
+  off = pstr->cur_idx + idx;
+#ifdef RE_ENABLE_I18N
+  if (pstr->offsets_needed)
+    off = pstr->offsets[off];
+#endif
+
+  ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
+  if (pstr->trans)
+    ch = pstr->trans[ch];
+
+#ifdef RE_ENABLE_I18N
+  /* Ensure that e.g. for tr_TR.UTF-8 BACKSLASH DOTLESS SMALL LETTER I
+     this function returns CAPITAL LETTER I instead of first byte of
+     DOTLESS SMALL LETTER I.  The latter would confuse the parser,
+     since peek_byte_case doesn't advance cur_idx in any way.  */
+  if (pstr->offsets_needed && !isascii (ch))
+    return re_string_peek_byte (pstr, idx);
+#endif
+
+  return ch;
+}
+
+static unsigned char
+re_string_fetch_byte_case (re_string_t *pstr)
+{
+  int ch, off;
+
+  if (BE (!pstr->icase, 1))
+    return re_string_fetch_byte (pstr);
+
+#ifdef RE_ENABLE_I18N
+  if (pstr->offsets_needed)
+    {
+      /* For tr_TR.UTF-8 [[:islower:]] there is
+	 [[: CAPITAL LETTER I WITH DOT lower:]] in mbs.  Skip
+	 in that case the whole multi-byte character and return
+	 the original letter.  On the other side, with
+	 [[: DOTLESS SMALL LETTER I return [[:I, as doing
+	 anything else would complicate things too much.  */
+
+      if (!re_string_first_byte (pstr, pstr->cur_idx))
+	return re_string_fetch_byte (pstr);
+
+      off = pstr->offsets[pstr->cur_idx];
+      ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
+      if (pstr->trans)
+	ch = pstr->trans[ch];
+
+      if (! isascii (ch))
+	return re_string_fetch_byte (pstr);
+
+      re_string_skip_bytes (pstr,
+			    re_string_char_size_at (pstr, pstr->cur_idx));
+      return ch;
+    }
+#endif
+
+  ch = pstr->raw_mbs[pstr->raw_mbs_idx + pstr->cur_idx++];
+  if (pstr->trans)
+    ch = pstr->trans[ch];
+  return ch;
+}
+
 static void
 re_string_destruct (pstr)
      re_string_t *pstr;
 {
 #ifdef RE_ENABLE_I18N
   re_free (pstr->wcs);
+  re_free (pstr->offsets);
 #endif /* RE_ENABLE_I18N  */
-  if (MBS_ALLOCATED (pstr))
+  if (pstr->mbs_allocated)
     re_free (pstr->mbs);
-  if (MBS_CASE_ALLOCATED (pstr))
-    re_free (pstr->mbs_case);
 }
 
 /* Return the context at IDX in INPUT.  */