--- grep-2.5.1/src/search.c	2004-12-14 15:08:58.985159277 +0000

+++ grep-2.5.1/src/search.c	2004-12-14 15:55:21.257729918 +0000

@@ -39,6 +39,9 @@

 #ifdef HAVE_LIBPCRE

 # include <pcre.h>

 #endif

+#ifdef HAVE_LANGINFO_CODESET

+# include <langinfo.h>

+#endif

 #define NCHAR (UCHAR_MAX + 1)

@@ -70,9 +73,10 @@

    call the regexp matcher at all. */

 static int kwset_exact_matches;

-#if defined(MBS_SUPPORT)

-static char* check_multibyte_string PARAMS ((char const *buf, size_t size));

-#endif

+/* UTF-8 encoding allows some optimizations that we can't otherwise

+   assume in a multibyte encoding. */

+static int using_utf8;

+

 static void kwsinit PARAMS ((void));

 static void kwsmusts PARAMS ((void));

 static void Gcompile PARAMS ((char const *, size_t));

@@ -84,6 +88,15 @@

 static size_t Pexecute PARAMS ((char const *, size_t, size_t *, int));

 void

+check_utf8 (void)

+{

+#ifdef HAVE_LANGINFO_CODESET

+  if (strcmp (nl_langinfo (CODESET), "UTF-8") == 0)

+    using_utf8 = 1;

+#endif

+}

+

+void

 dfaerror (char const *mesg)

 {

   error (2, 0, mesg);

@@ -141,47 +154,6 @@

     }

 }

-#ifdef MBS_SUPPORT

-/* This function allocate the array which correspond to "buf".

-   Then this check multibyte string and mark on the positions which

-   are not singlebyte character nor the first byte of a multibyte

-   character.  Caller must free the array.  */

-static char*

-check_multibyte_string(char const *buf, size_t size)

-{

-  char *mb_properties = xmalloc(size);

-  mbstate_t cur_state;

-  wchar_t wc;

-  int i;

-  memset(&cur_state, 0, sizeof(mbstate_t));

-  memset(mb_properties, 0, sizeof(char)*size);

-  for (i = 0; i < size ;)

-    {

-      size_t mbclen;

-      mbclen = mbrtowc(&wc, buf + i, size - i, &cur_state);

-

-      if (mbclen == (size_t) -1 || mbclen == (size_t) -2 || mbclen == 0)

-	{

-	  /* An invalid sequence, or a truncated multibyte character.

-	     We treat it as a singlebyte character.  */

-	  mbclen = 1;

-	}

-      else if (match_icase)

-	{

-	  if (iswupper((wint_t)wc))

-	    {

-	      wc = towlower((wint_t)wc);

-	      wcrtomb(buf + i, wc, &cur_state);

-	    }

-	}

-      mb_properties[i] = mbclen;

-      i += mbclen;

-    }

-

-  return mb_properties;

-}

-#endif

-

 static void

 Gcompile (char const *pattern, size_t size)

 {

@@ -190,6 +162,7 @@

   size_t total = size;

   char const *motif = pattern;

+  check_utf8 ();

   re_set_syntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE | (match_icase ? RE_ICASE : 0));

   dfasyntax (RE_SYNTAX_GREP | RE_HAT_LISTS_NOT_NEWLINE, match_icase, eolbyte);

@@ -266,6 +239,7 @@

   size_t total = size;

   char const *motif = pattern;

+  check_utf8 ();

   if (strcmp (matcher, "awk") == 0)

     {

       re_set_syntax (RE_SYNTAX_AWK | (match_icase ? RE_ICASE : 0));

@@ -350,18 +324,8 @@

   struct kwsmatch kwsm;

   size_t i, ret_val;

 #ifdef MBS_SUPPORT

-  char *mb_properties = NULL;

-  if (MB_CUR_MAX > 1)

-    {

-      if (match_icase)

-        {

-          char *case_buf = xmalloc(size);

-          memcpy(case_buf, buf, size);

-          buf = case_buf;

-        }

-      if (kwset)

-        mb_properties = check_multibyte_string(buf, size);

-    }

+  mbstate_t mbs;

+  memset (&mbs, '\0', sizeof (mbstate_t));

 #endif /* MBS_SUPPORT */

   buflim = buf + size;

@@ -373,18 +337,48 @@

 	  if (kwset)

 	    {

 	      /* Find a possible match using the KWset matcher. */

+#ifdef MBS_SUPPORT

+	      size_t bytes_left = 0;

+#endif /* MBS_SUPPORT */

 	      size_t offset = kwsexec (kwset, beg, buflim - beg, &kwsm);

 	      if (offset == (size_t) -1)

 	        goto failure;

+#ifdef MBS_SUPPORT

+	      if (MB_CUR_MAX > 1 && !using_utf8)

+		{

+		  bytes_left = offset;

+		  while (bytes_left)

+		    {

+		      size_t len = mbrlen (beg, bytes_left, &mbs);

+		      if (len == (size_t) -1 || len == 0)

+			{

+			  /* Incomplete character: treat as single-byte. */

+			  memset (&mbs, '\0', sizeof (mbstate_t));

+			  beg++;

+			  bytes_left--;

+			  continue;

+			}

+

+		      if (len == (size_t) -2)

+			/* Offset points inside multibyte character:

+			 * no good. */

+			break;

+

+		      beg += len;

+		      bytes_left -= len;

+		    }

+		}

+	      else

+#endif /* MBS_SUPPORT */

 	      beg += offset;

 	      /* Narrow down to the line containing the candidate, and

 		 run it through DFA. */

 	      end = memchr(beg, eol, buflim - beg);

 	      end++;

 #ifdef MBS_SUPPORT

-	      if (MB_CUR_MAX > 1 && mb_properties[beg - buf] == 0)

+	      if (MB_CUR_MAX > 1 && bytes_left)

 		continue;

-#endif

+#endif /* MBS_SUPPORT */

 	      while (beg > buf && beg[-1] != eol)

 		--beg;

 	      if (kwsm.index < kwset_exact_matches)

@@ -395,13 +389,47 @@

 	  else

 	    {

 	      /* No good fixed strings; start with DFA. */

+#ifdef MBS_SUPPORT

+	      size_t bytes_left = 0;

+#endif /* MBS_SUPPORT */

 	      size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);

 	      if (offset == (size_t) -1)

 		break;

 	      /* Narrow down to the line we've found. */

+#ifdef MBS_SUPPORT

+	      if (MB_CUR_MAX > 1 && !using_utf8)

+		{

+		  bytes_left = offset;

+		  while (bytes_left)

+		    {

+		      size_t len = mbrlen (beg, bytes_left, &mbs);

+		      if (len == (size_t) -1 || len == 0)

+			{

+			  /* Incomplete character: treat as single-byte. */

+			  memset (&mbs, '\0', sizeof (mbstate_t));

+			  beg++;

+			  bytes_left--;

+			  continue;

+			}

+

+		      if (len == (size_t) -2)

+			/* Offset points inside multibyte character:

+			 * no good. */

+			break;

+

+		      beg += len;

+		      bytes_left -= len;

+		    }

+		}

+	      else

+#endif /* MBS_SUPPORT */

 	      beg += offset;

 	      end = memchr (beg, eol, buflim - beg);

 	      end++;

+#ifdef MBS_SUPPORT

+	      if (MB_CUR_MAX > 1 && bytes_left)

+		continue;

+#endif /* MBS_SUPPORT */

 	      while (beg > buf && beg[-1] != eol)

 		--beg;

 	    }

@@ -469,15 +497,6 @@

     } /* for (beg = end ..) */

  failure:

-#ifdef MBS_SUPPORT

-  if (MB_CUR_MAX > 1)

-    {

-      if (mb_properties)

-	free (mb_properties);

-      if (match_icase)

-	free ((char *) buf);

-    }

-#endif /* MBS_SUPPORT */

   return (size_t) -1;

  success_in_beg_and_end:

@@ -486,15 +505,6 @@

   /* FALLTHROUGH */

  success_in_start_and_len:

-#ifdef MBS_SUPPORT

-  if (MB_CUR_MAX > 1)

-    {

-      if (mb_properties)

-	free (mb_properties);

-      if (match_icase)

-	free ((char *) buf);

-    }

-#endif /* MBS_SUPPORT */

   *match_size = len;

   return start;

 }

@@ -504,6 +514,7 @@

 {

   char const *beg, *lim, *err;

+  check_utf8 ();

   kwsinit ();

   beg = pattern;

   do

@@ -531,17 +542,8 @@

   struct kwsmatch kwsmatch;

   size_t ret_val;

 #ifdef MBS_SUPPORT

-  char *mb_properties = NULL;

-  if (MB_CUR_MAX > 1)

-    {

-      if (match_icase)

-        {

-          char *case_buf = xmalloc(size);

-          memcpy(case_buf, buf, size);

-          buf = case_buf;

-        }

-      mb_properties = check_multibyte_string(buf, size);

-    }

+  mbstate_t mbs;

+  memset (&mbs, '\0', sizeof (mbstate_t));

 #endif /* MBS_SUPPORT */

   for (beg = buf; beg <= buf + size; ++beg)

@@ -550,8 +552,33 @@

       if (offset == (size_t) -1)

 	goto failure;

 #ifdef MBS_SUPPORT

-      if (MB_CUR_MAX > 1 && mb_properties[offset+beg-buf] == 0)

-	continue; /* It is a part of multibyte character.  */

+      if (MB_CUR_MAX > 1 && !using_utf8)

+	{

+	  size_t bytes_left = offset;

+	  while (bytes_left)

+	    {

+	      size_t len = mbrlen (beg, bytes_left, &mbs);

+	      if (len == (size_t) -1 || len == 0)

+		{

+		  /* Incomplete character: treat as single-byte. */

+		  memset (&mbs, '\0', sizeof (mbstate_t));

+		  beg++;

+		  bytes_left--;

+		  continue;

+		}

+

+	      if (len == (size_t) -2)

+		/* Offset points inside multibyte character: no good. */

+		break;

+

+	      beg += len;

+	      bytes_left -= len;

+	    }

+

+	  if (bytes_left)

+	    continue;

+	}

+      else

 #endif /* MBS_SUPPORT */

       beg += offset;

       len = kwsmatch.size[0];

@@ -587,6 +614,36 @@

 	          if (offset == -1) {

 	            break; /* Try a different anchor. */

 	          }

+#ifdef MBS_SUPPORT

+		  if (MB_CUR_MAX > 1 && !using_utf8)

+		    {

+		      size_t bytes_left = offset;

+		      while (bytes_left)

+			{

+			  size_t len = mbrlen (beg, bytes_left, &mbs);

+			  if (len == (size_t) -1 || len == 0)

+			    {

+			      /* Incomplete character: treat as single-byte. */

+			      memset (&mbs, '\0', sizeof (mbstate_t));

+			      beg++;

+			      bytes_left--;

+			      continue;

+			    }

+

+			  if (len == (size_t) -2)

+			    /* Offset points inside multibyte character:

+			     * no good. */

+			    break;

+

+			  beg += len;

+			  bytes_left -= len;

+			}

+

+		      if (bytes_left)

+			break; /* Try a different anchor. */

+		    }

+		  else

+#endif /* MBS_SUPPORT */

 	          beg += offset;

 	          len = kwsmatch.size[0];

 	        }

@@ -597,19 +654,31 @@

     }

  failure:

+  return -1;

+

+ success:

 #ifdef MBS_SUPPORT

-  if (MB_CUR_MAX > 1)

+  if (MB_CUR_MAX > 1 && !using_utf8)

     {

-      if (match_icase)

-        free((char *) buf);

-      if (mb_properties)

-        free(mb_properties);

+      end = beg + len;

+      while (end < buf + size)

+	{

+	  size_t len = mbrlen (end, buf + size - end, &mbs);

+	  if (len == (size_t) -1 || len == (size_t) -2 || len == 0)

+	    {

+	      memset (&mbs, '\0', sizeof (mbstate_t));

+	      len = 1;

+	    }

+	  if (len == 1 && *end == eol)

+	    break;

+

+	  end += len;

+	}

     }

+  else

 #endif /* MBS_SUPPORT */

-  return -1;

-

- success:

   end = memchr (beg + len, eol, (buf + size) - (beg + len));

+

   end++;

   while (buf < beg && beg[-1] != eol)

     --beg;

@@ -618,15 +687,6 @@

  success_in_beg_and_len:

   *match_size = len;

-#ifdef MBS_SUPPORT

-  if (MB_CUR_MAX > 1)

-    {

-      if (mb_properties)

-	free (mb_properties);

-      if (match_icase)

-	free ((char *) buf);

-    }

-#endif /* MBS_SUPPORT */

   return beg - buf;

 }