source: patches/grep-2.5.4-i18n-1.patch@ 893c248c

lib/posix/regex.h

@@ -165 +165 @@
    treated as 'a\{1'.  */
 #define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
 
+/* If this bit is set, then ignore case when matching.
+   If not set, then case is significant.  */
+#define RE_ICASE (RE_INVALID_INTERVAL_ORD << 1)
+
 /* This global variable defines the particular regexp syntax to use (for
    some interfaces).  When a regexp is compiled, the syntax used is
    stored in the pattern buffer, so changing this does not affect

grep-2.5.3.

@@ -594 +594 @@
                 /* build character class.  */
                 {
                   wctype_t wt;
+                  /* NOTE:
+                   * when case_fold, character class [:upper:] and [:lower:]
+                   * should be treated as [:alpha:], this is the same way
+                   * of glibc/posix/regcomp.c:build_charclass().
+                   * reported by Bug#276202
+                   * - fixed by Fumitoshi UKAI
+                   */
+                  if (case_fold 
+                      && (strcmp (str, "upper") == 0 || strcmp (str, "lower") == 0)) 
+                      strcpy (str, "alpha");
+
                   /* Query the character class as wctype_t.  */
                   wt = wctype (str);
 
@@ -681 +692 @@
           REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
                                range_ends_al, work_mbc->nranges + 1);
           work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)wc2;
+          if (case_fold 
+              && (iswlower((wint_t)wc) || iswupper((wint_t)wc))
+              && (iswlower((wint_t)wc2) || iswupper((wint_t)wc2))) {
+            wint_t altcase;
+            altcase = wc;
+            if (iswlower((wint_t)wc))
+              altcase = towupper((wint_t)wc);
+            else
+              altcase = towlower((wint_t)wc);
+            REALLOC_IF_NECESSARY(work_mbc->range_sts, wchar_t,
+                                 range_sts_al, work_mbc->nranges + 1);
+            work_mbc->range_sts[work_mbc->nranges] = (wchar_t)altcase;
+            
+            altcase = wc2;
+            if (iswlower((wint_t)wc2))
+              altcase = towupper((wint_t)wc2);
+            else
+              altcase = towlower((wint_t)wc2);
+            REALLOC_IF_NECESSARY(work_mbc->range_ends, wchar_t,
+                                 range_ends_al, work_mbc->nranges + 1);
+            work_mbc->range_ends[work_mbc->nranges++] = (wchar_t)altcase;
+            
+          }
         }
       else if (wc != WEOF)
         /* build normal characters.  */
@@ -688 +722 @@
           REALLOC_IF_NECESSARY(work_mbc->chars, wchar_t, chars_al,
                                work_mbc->nchars + 1);
           work_mbc->chars[work_mbc->nchars++] = (wchar_t)wc;
+          if (case_fold && (iswlower((wint_t) wc) || iswupper((wint_t) wc)))
+            {
+                wint_t altcase;
+
+                altcase = wc;           /* keeps compiler happy */
+                if (iswlower((wint_t) wc))
+                  altcase = towupper((wint_t) wc);
+                else if (iswupper((wint_t) wc))
+                  altcase = towlower((wint_t) wc);
+
+                REALLOC_IF_NECESSARY(work_mbc->chars, wchar_t, chars_al,
+                               work_mbc->nchars + 1);
+                work_mbc->chars[work_mbc->nchars++] = (wchar_t) altcase;
+            }
         }
     }
   while ((wc = wc1) != L']');

src/grep.c

@@ -274 +274 @@
 #endif
 ;
 
+/* Default for `file_list' if no files are given on the command line. */
+static char *stdin_argv[] =
+{
+  "-", NULL
+};
+
 /* Non-boolean long options that have no corresponding short equivalents.  */
 enum
 {
@@ -534 +540 @@
          for byte sentinels fore and aft.  */
       newalloc = newsize + pagesize + 1;
 
-      newbuf = bufalloc < newalloc ? xmalloc (bufalloc = newalloc) : buffer;
+      newbuf = bufalloc < newalloc ? malloc (bufalloc = newalloc) : buffer;
+      if (newbuf == NULL)
+        {
+          int saved_errno = errno;
+          free (buffer);
+          bufalloc = ALIGN_TO (INITIAL_BUFSIZE, pagesize) + pagesize + 1;
+          buffer = xmalloc (bufalloc);
+          errno = saved_errno;
+          return 0;
+        }
       readbuf = ALIGN_TO (newbuf + 1 + save, pagesize);
       bufbeg = readbuf - save;
       memmove (bufbeg, buffer + saved_offset, save);
@@ -1825 +1840 @@
   FILE *fp;
   extern char *optarg;
   extern int optind;
+  char **file_list;
 
   initialize_main (&argc, &argv);
   program_name = argv[0];
@@ -2244 +2260 @@
   if (max_count == 0)
     exit (1);
 
-  if (optind < argc)
+  file_list = (optind == argc ? stdin_argv : &argv[optind]);
+
+  status = 1;
+  while (1)
     {
-        status = 1;
-        do
+      char *file = *file_list++;
+
+      if (file == NULL)
+        break;
+
+      if ((included_patterns || excluded_patterns)
+          && !isdir (file))
         {
-          char *file = argv[optind];
-          if ((included_patterns || excluded_patterns)
-              && !isdir (file))
-            {
-              if (included_patterns &&
-                  ! excluded_filename (included_patterns, file, 0))
-                continue;
-              if (excluded_patterns &&
-                  excluded_filename (excluded_patterns, file, 0))
-                continue;
-            }
-          status &= grepfile (strcmp (file, "-") == 0 ? (char *) NULL : file,
-                              &stats_base);
+          if (included_patterns &&
+              ! excluded_filename (included_patterns, file, 0))
+            continue;
+          if (excluded_patterns &&
+              excluded_filename (excluded_patterns, file, 0))
+            continue;
         }
-        while ( ++optind < argc);
+      status &= grepfile (strcmp (file, "-") == 0
+                          ? (char *) NULL : file, &stats_base);
     }
-  else
-    status = grepfile ((char *) NULL, &stats_base);
 
   /* We register via atexit() to test stdout.  */
   exit (errseen ? 2 : status);

src/search.c

@@ -18 +18 @@
 
 /* Written August 1992 by Mike Haertel. */
 
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE 1
+#endif
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
+#include <assert.h>
+
 #include <sys/types.h>
 
 #include "mbsupport.h"
@@ -43 +48 @@
 #ifdef HAVE_LIBPCRE
 # include <pcre.h>
 #endif
+#ifdef HAVE_LANGINFO_CODESET
+# include <langinfo.h>
+#endif
 
 #define NCHAR (UCHAR_MAX + 1)
 
@@ -68 +76 @@
     error (2, 0, _("memory exhausted"));
 }
 
+/* UTF-8 encoding allows some optimizations that we can't otherwise
+   assume in a multibyte encoding. */
+static int using_utf8;
+
+void
+check_utf8 (void)
+{
+#ifdef HAVE_LANGINFO_CODESET
+  if (strcmp (nl_langinfo (CODESET), "UTF-8") == 0)
+    using_utf8 = 1;
+#endif
+}
+
 #ifndef FGREP_PROGRAM
 /* DFA compiled regexp. */
 static struct dfa dfa;
@@ -134 +155 @@
 }
 #endif /* !FGREP_PROGRAM */
 
-#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 single byte 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 single byte 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 /* MBS_SUPPORT */
-
 #if defined(GREP_PROGRAM) || defined(EGREP_PROGRAM)
 #ifdef EGREP_PROGRAM
 COMPILE_FCT(Ecompile)
@@ -193 +171 @@
   size_t total = size;
   char const *motif = pattern;
 
-#if 0
+  check_utf8 ();
   if (match_icase)
     syntax_bits |= RE_ICASE;
-#endif
   re_set_syntax (syntax_bits);
   dfasyntax (syntax_bits, match_icase, eolbyte);
 
@@ -301 +278 @@
   char eol = eolbyte;
   int backref, start, len, best_len;
   struct kwsmatch kwsm;
+  static int use_dfa;
+  static int use_dfa_checked = 0;
   size_t i, ret_val;
 #ifdef MBS_SUPPORT
-  char *mb_properties = NULL;
-  if (MB_CUR_MAX > 1)
+  const char *last_char = NULL;
+  int mb_cur_max = MB_CUR_MAX;
+  mbstate_t mbs;
+  memset (&mbs, '\0', sizeof (mbstate_t));
+#endif /* MBS_SUPPORT */
+
+  if (!use_dfa_checked)
     {
-      if (match_icase)
-        {
-          char *case_buf = xmalloc(size);
-          memcpy(case_buf, buf, size);
-          if (start_ptr)
-            start_ptr = case_buf + (start_ptr - buf);
-          buf = case_buf;
-        }
-      if (kwset)
-        mb_properties = check_multibyte_string(buf, size);
-    }
+      char *grep_use_dfa = getenv ("GREP_USE_DFA");
+      if (!grep_use_dfa)
+        {
+#ifdef MBS_SUPPORT
+          /* Turn off DFA when processing multibyte input. */
+          use_dfa = (MB_CUR_MAX == 1);
+#else
+          use_dfa = 1;
 #endif /* MBS_SUPPORT */
+        }
+      else
+        {
+          use_dfa = atoi (grep_use_dfa);
+        }
+
+      use_dfa_checked = 1;
+    }
 
   buflim = buf + size;
 
@@ -329 +318 @@
           if (kwset)
             {
               /* Find a possible match using the KWset matcher. */
-              size_t offset = kwsexec (kwset, beg, buflim - beg, &kwsm);
+#ifdef MBS_SUPPORT
+              size_t bytes_left = 0;
+#endif /* MBS_SUPPORT */
+              size_t offset;
+#ifdef MBS_SUPPORT
+              /* kwsexec doesn't work with match_icase and multibyte input. */
+              if (match_icase && mb_cur_max > 1)
+                /* Avoid kwset */
+                offset = 0;
+              else
+#endif /* MBS_SUPPORT */
+              offset = kwsexec (kwset, beg, buflim - beg, &kwsm);
               if (offset == (size_t) -1)
-                goto failure;
+                return (size_t)-1;
+#ifdef MBS_SUPPORT
+              if (mb_cur_max > 1 && !using_utf8)
+                {
+                  bytes_left = offset;
+                  while (bytes_left)
+                    {
+                      size_t mlen = mbrlen (beg, bytes_left, &mbs);
+
+                      last_char = beg;
+                      if (mlen == (size_t) -1 || mlen == 0)
+                        {
+                          /* Incomplete character: treat as single-byte. */
+                          memset (&mbs, '\0', sizeof (mbstate_t));
+                          beg++;
+                          bytes_left--;
+                          continue;
+                        }
+
+                      if (mlen == (size_t) -2)
+                        /* Offset points inside multibyte character:
+                         * no good. */
+                        break;
+
+                      beg += mlen;
+                      bytes_left -= mlen;
+                    }
+                }
+              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
               while (beg > buf && beg[-1] != eol)
                 --beg;
-              if (kwsm.index < kwset_exact_matches)
+              if (
+#ifdef MBS_SUPPORT
+                  !(match_icase && mb_cur_max > 1) &&
+#endif /* MBS_SUPPORT */
+                  (kwsm.index < kwset_exact_matches))
                 goto success;
-              if (dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
+              if (use_dfa &&
+                  dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
                 continue;
             }
           else
             {
               /* No good fixed strings; start with DFA. */
-              size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);
+#ifdef MBS_SUPPORT
+              size_t bytes_left = 0;
+#endif /* MBS_SUPPORT */
+              size_t offset = 0;
+              if (use_dfa)
+                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 mlen = mbrlen (beg, bytes_left, &mbs);
+
+                      last_char = beg;
+                      if (mlen == (size_t) -1 || mlen == 0)
+                        {
+                          /* Incomplete character: treat as single-byte. */
+                          memset (&mbs, '\0', sizeof (mbstate_t));
+                          beg++;
+                          bytes_left--;
+                          continue;
+                        }
+
+                      if (mlen == (size_t) -2)
+                        /* Offset points inside multibyte character:
+                         * no good. */
+                        break;
+
+                      beg += mlen;
+                      bytes_left -= mlen;
+                    }
+                }
+              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;
             }
           /* Successful, no backreferences encountered! */
-          if (!backref)
+          if (use_dfa && !backref)
             goto success;
         }
       else
@@ -408 +480 @@
               if (match_words)
                 while (match <= best_match)
                   {
-                    if ((match == buf || !WCHAR ((unsigned char) match[-1]))
-                        && (len == end - beg - 1
-                            || !WCHAR ((unsigned char) match[len])))
-                      goto assess_pattern_match;
+                    int lword_match = 0;
+                    if (match == buf)
+                      lword_match = 1;
+                    else
+                      {
+                        assert (start > 0);
+#ifdef MBS_SUPPORT
+                        if (mb_cur_max > 1)
+                          {
+                            const char *s;
+                            int mr;
+                            wchar_t pwc;
+                            if (using_utf8)
+                              {
+                                s = match - 1;
+                                while (s > buf
+                                       && (unsigned char) *s >= 0x80
+                                       && (unsigned char) *s <= 0xbf)
+                                  --s;
+                              }
+                            else
+                              s = last_char;
+                            mr = mbtowc (&pwc, s, match - s);
+                            if (mr <= 0)
+                              {
+                                memset (&mbs, '\0', sizeof (mbstate_t));
+                                lword_match = 1;
+                              }
+                            else if (!(iswalnum (pwc) || pwc == L'_')
+                                     && mr == (int) (match - s))
+                              lword_match = 1;
+                          }
+                        else
+#endif /* MBS_SUPPORT */
+                        if (!WCHAR ((unsigned char) match[-1]))
+                          lword_match = 1;
+                      }
+
+                    if (lword_match)
+                      {
+                        int rword_match = 0;
+                        if (start + len == end - beg - 1)
+                          rword_match = 1;
+                        else
+                          {
+#ifdef MBS_SUPPORT
+                            if (mb_cur_max > 1)
+                              {
+                                wchar_t nwc;
+                                int mr;
+
+                                mr = mbtowc (&nwc, buf + start + len,
+                                             end - buf - start - len - 1);
+                                if (mr <= 0)
+                                  {
+                                    memset (&mbs, '\0', sizeof (mbstate_t));
+                                    rword_match = 1;
+                                  }
+                                else if (!iswalnum (nwc) && nwc != L'_')
+                                  rword_match = 1;
+                              }
+                            else
+#endif /* MBS_SUPPORT */
+                            if (!WCHAR ((unsigned char) match[len]))
+                              rword_match = 1;
+                          }
+
+                        if (rword_match)
+                          {
+                            if (!start_ptr)
+                              /* Returns the whole line. */
+                              goto success;
+                            else
+                              {
+                                goto assess_pattern_match;
+                              }
+                          }
+                      }
                     if (len > 0)
                       {
                         /* Try a shorter length anchored at the same place. */
@@ -475 +621 @@
   *match_size = len;
   ret_val = beg - buf;
  out:
-#ifdef MBS_SUPPORT
-  if (MB_CUR_MAX > 1)
-    {
-      if (match_icase)
-        free((char*)buf);
-      if (mb_properties)
-        free(mb_properties);
-    }
-#endif /* MBS_SUPPORT */
   return ret_val;
 }
 #endif /* defined(GREP_PROGRAM) || defined(EGREP_PROGRAM) */
 
+#ifdef MBS_SUPPORT
+static int f_i_multibyte; /* whether we're using the new -Fi MB method */
+static struct
+{
+  wchar_t **patterns;
+  size_t count, maxlen;
+  unsigned char *match;
+} Fimb;
+#endif
+
 #if defined(GREP_PROGRAM) || defined(FGREP_PROGRAM)
 COMPILE_FCT(Fcompile)
 {
+  int mb_cur_max = MB_CUR_MAX;
   char const *beg, *lim, *err;
 
+  check_utf8 ();
+#ifdef MBS_SUPPORT
+  /* Support -F -i for UTF-8 input. */
+  if (match_icase && mb_cur_max > 1)
+    {
+      mbstate_t mbs;
+      wchar_t *wcpattern = xmalloc ((size + 1) * sizeof (wchar_t));
+      const char *patternend = pattern;
+      size_t wcsize;
+      kwset_t fimb_kwset = NULL;
+      char *starts = NULL;
+      wchar_t *wcbeg, *wclim;
+      size_t allocated = 0;
+
+      memset (&mbs, '\0', sizeof (mbs));
+# ifdef __GNU_LIBRARY__
+      wcsize = mbsnrtowcs (wcpattern, &patternend, size, size, &mbs);
+      if (patternend != pattern + size)
+        wcsize = (size_t) -1;
+# else
+      {
+        char *patterncopy = xmalloc (size + 1);
+
+        memcpy (patterncopy, pattern, size);
+        patterncopy[size] = '\0';
+        patternend = patterncopy;
+        wcsize = mbsrtowcs (wcpattern, &patternend, size, &mbs);
+        if (patternend != patterncopy + size)
+          wcsize = (size_t) -1;
+        free (patterncopy);
+      }
+# endif
+      if (wcsize + 2 <= 2)
+        {
+fimb_fail:
+          free (wcpattern);
+          free (starts);
+          if (fimb_kwset)
+            kwsfree (fimb_kwset);
+          free (Fimb.patterns);
+          Fimb.patterns = NULL;
+        }
+      else
+        {
+          if (!(fimb_kwset = kwsalloc (NULL)))
+            error (2, 0, _("memory exhausted"));
+
+          starts = xmalloc (mb_cur_max * 3);
+          wcbeg = wcpattern;
+          do
+            {
+              int i;
+              size_t wclen;
+
+              if (Fimb.count >= allocated)
+                {
+                  if (allocated == 0)
+                    allocated = 128;
+                  else
+                    allocated *= 2;
+                  Fimb.patterns = xrealloc (Fimb.patterns,
+                                            sizeof (wchar_t *) * allocated);
+                }
+              Fimb.patterns[Fimb.count++] = wcbeg;
+              for (wclim = wcbeg;
+                   wclim < wcpattern + wcsize && *wclim != L'\n'; ++wclim)
+                *wclim = towlower (*wclim);
+              *wclim = L'\0';
+              wclen = wclim - wcbeg;
+              if (wclen > Fimb.maxlen)
+                Fimb.maxlen = wclen;
+              if (wclen > 3)
+                wclen = 3;
+              if (wclen == 0)
+                {
+                  if ((err = kwsincr (fimb_kwset, "", 0)) != 0)
+                    error (2, 0, err);
+                }
+              else
+                for (i = 0; i < (1 << wclen); i++)
+                  {
+                    char *p = starts;
+                    int j, k;
+
+                    for (j = 0; j < wclen; ++j)
+                      {
+                        wchar_t wc = wcbeg[j];
+                        if (i & (1 << j))
+                          {
+                            wc = towupper (wc);
+                            if (wc == wcbeg[j])
+                              continue;
+                          }
+                        k = wctomb (p, wc);
+                        if (k <= 0)
+                          goto fimb_fail;
+                        p += k;
+                      }
+                    if ((err = kwsincr (fimb_kwset, starts, p - starts)) != 0)
+                      error (2, 0, err);
+                  }
+              if (wclim < wcpattern + wcsize)
+                ++wclim;
+              wcbeg = wclim;
+            }
+          while (wcbeg < wcpattern + wcsize);
+          f_i_multibyte = 1;
+          kwset = fimb_kwset;
+          free (starts);
+          Fimb.match = xmalloc (Fimb.count);
+          if ((err = kwsprep (kwset)) != 0)
+            error (2, 0, err);
+          return;
+        }
+    }
+#endif /* MBS_SUPPORT */
+
+
   kwsinit ();
   beg = pattern;
   do
@@ -511 +777 @@
     error (2, 0, err);
 }
 
+#ifdef MBS_SUPPORT
+static int
+Fimbexec (const char *buf, size_t size, size_t *plen, int exact)
+{
+  size_t len, letter, i;
+  int ret = -1;
+  mbstate_t mbs;
+  wchar_t wc;
+  int patterns_left;
+
+  assert (match_icase && f_i_multibyte == 1);
+  assert (MB_CUR_MAX > 1);
+
+  memset (&mbs, '\0', sizeof (mbs));
+  memset (Fimb.match, '\1', Fimb.count);
+  letter = len = 0;
+  patterns_left = 1;
+  while (patterns_left && len <= size)
+    {
+      size_t c;
+
+      patterns_left = 0;
+      if (len < size)
+        {
+          c = mbrtowc (&wc, buf + len, size - len, &mbs);
+          if (c + 2 <= 2)
+            return ret;
+
+          wc = towlower (wc);
+        }
+      else
+        {
+          c = 1;
+          wc = L'\0';
+        }
+
+      for (i = 0; i < Fimb.count; i++)
+        {
+          if (Fimb.match[i])
+            {
+              if (Fimb.patterns[i][letter] == L'\0')
+                {
+                  /* Found a match. */
+                  *plen = len;
+                  if (!exact && !match_words)
+                    return 0;
+                  else
+                    {
+                      /* For -w or exact look for longest match.  */
+                      ret = 0;
+                      Fimb.match[i] = '\0';
+                      continue;
+                    }
+                }
+
+              if (Fimb.patterns[i][letter] == wc)
+                patterns_left = 1;
+              else
+                Fimb.match[i] = '\0';
+            }
+        }
+
+      len += c;
+      letter++;
+    }
+
+  return ret;
+}
+#endif /* MBS_SUPPORT */
+
 EXECUTE_FCT(Fexecute)
 {
   register char const *beg, *try, *end;
@@ -519 +855 @@
   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);
-          if (start_ptr)
-            start_ptr = case_buf + (start_ptr - buf);
-          buf = case_buf;
-        }
-      mb_properties = check_multibyte_string(buf, size);
-    }
+  int mb_cur_max = MB_CUR_MAX;
+  mbstate_t mbs;
+  memset (&mbs, '\0', sizeof (mbstate_t));
+  const char *last_char = NULL;
 #endif /* MBS_SUPPORT */
 
   for (beg = start_ptr ? start_ptr : buf; beg <= buf + size; beg++)
     {
       size_t offset = kwsexec (kwset, beg, buf + size - beg, &kwsmatch);
       if (offset == (size_t) -1)
-        goto failure;
+        return offset;
 #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 mlen = mbrlen (beg, bytes_left, &mbs);
+
+              last_char = beg;
+              if (mlen == (size_t) -1 || mlen == 0)
+                {
+                  /* Incomplete character: treat as single-byte. */
+                  memset (&mbs, '\0', sizeof (mbstate_t));
+                  beg++;
+                  bytes_left--;
+                  continue;
+                }
+
+              if (mlen == (size_t) -2)
+                /* Offset points inside multibyte character: no good. */
+                break;
+
+              beg += mlen;
+              bytes_left -= mlen;
+            }
+
+          if (bytes_left)
+            continue;
+        }
+      else
 #endif /* MBS_SUPPORT */
       beg += offset;
+#ifdef MBS_SUPPORT
+      /* For f_i_multibyte, the string at beg now matches first 3 chars of
+         one of the search strings (less if there are shorter search strings).
+         See if this is a real match.  */
+      if (f_i_multibyte
+          && Fimbexec (beg, buf + size - beg, &kwsmatch.size[0], start_ptr == NULL))
+        goto next_char;
+#endif /* MBS_SUPPORT */
       len = kwsmatch.size[0];
       if (start_ptr && !match_words)
         goto success_in_beg_and_len;
       if (match_lines)
         {
           if (beg > buf && beg[-1] != eol)
-            continue;
+            goto next_char;
           if (beg + len < buf + size && beg[len] != eol)
-            continue;
+            goto next_char;
           goto success;
         }
       else if (match_words)
-        for (try = beg; len; )
-          {
-            if (try > buf && WCHAR((unsigned char) try[-1]))
-              break;
-            if (try + len < buf + size && WCHAR((unsigned char) try[len]))
-              {
-                offset = kwsexec (kwset, beg, --len, &kwsmatch);
-                if (offset == (size_t) -1)
-                  break;
-                try = beg + offset;
-                len = kwsmatch.size[0];
-              }
-            else if (!start_ptr)
-              goto success;
-            else
-              goto success_in_beg_and_len;
-          } /* for (try) */
-      else
+        {
+          while (len)
+            {
+              int word_match = 0;
+              if (beg > buf)
+                {
+#ifdef MBS_SUPPORT
+                  if (mb_cur_max > 1)
+                    {
+                      const char *s;
+                      int mr;
+                      wchar_t pwc;
+
+                      if (using_utf8)
+                        {
+                          s = beg - 1;
+                          while (s > buf
+                                 && (unsigned char) *s >= 0x80
+                                 && (unsigned char) *s <= 0xbf)
+                            --s;
+                        }
+                      else
+                        s = last_char;
+                      mr = mbtowc (&pwc, s, beg - s);
+                      if (mr <= 0)
+                        memset (&mbs, '\0', sizeof (mbstate_t));
+                      else if ((iswalnum (pwc) || pwc == L'_')
+                               && mr == (int) (beg - s))
+                        goto next_char;
+                    }
+                  else
+#endif /* MBS_SUPPORT */
+                  if (WCHAR ((unsigned char) beg[-1]))
+                    goto next_char;
+                }
+#ifdef MBS_SUPPORT
+              if (mb_cur_max > 1)
+                {
+                  wchar_t nwc;
+                  int mr;
+
+                  mr = mbtowc (&nwc, beg + len, buf + size - beg - len);
+                  if (mr <= 0)
+                    {
+                      memset (&mbs, '\0', sizeof (mbstate_t));
+                      word_match = 1;
+                    }
+                  else if (!iswalnum (nwc) && nwc != L'_')
+                    word_match = 1;
+                }
+              else
+#endif /* MBS_SUPPORT */
+                if (beg + len >= buf + size || !WCHAR ((unsigned char) beg[len]))
+                  word_match = 1;
+              if (word_match)
+                {
+                  if (start_ptr == NULL)
+                    /* Returns the whole line now we know there's a word match. */
+                    goto success;
+                  else {
+                    /* Returns just this word match. */
+                    *match_size = len;
+                    return beg - buf;
+                  }
+                }
+              if (len > 0)
+                {
+                  /* Try a shorter length anchored at the same place. */
+                  --len;
+                  offset = kwsexec (kwset, beg, len, &kwsmatch);
+
+                  if (offset == -1)
+                    goto next_char; /* Try a different anchor. */
+#ifdef MBS_SUPPORT
+
+                  if (mb_cur_max > 1 && !using_utf8)
+                    {
+                      size_t bytes_left = offset;
+                      while (bytes_left)
+                        {
+                          size_t mlen = mbrlen (beg, bytes_left, &mbs);
+
+                          last_char = beg;
+                          if (mlen == (size_t) -1 || mlen == 0)
+                            {
+                              /* Incomplete character: treat as single-byte. */
+                              memset (&mbs, '\0', sizeof (mbstate_t));
+                              beg++;
+                              bytes_left--;
+                              continue;
+                            }
+
+                          if (mlen == (size_t) -2)
+                            {
+                              /* Offset points inside multibyte character:
+                               * no good. */
+                              break;
+                            }
+
+                          beg += mlen;
+                          bytes_left -= mlen;
+                        }
+
+                      if (bytes_left)
+                        {
+                          memset (&mbs, '\0', sizeof (mbstate_t));
+                          goto next_char; /* Try a different anchor. */
+                        }
+                    }
+                  else
+#endif /* MBS_SUPPORT */
+                  beg += offset;
+#ifdef MBS_SUPPORT
+                  /* The string at beg now matches first 3 chars of one of
+                     the search strings (less if there are shorter search
+                     strings).  See if this is a real match.  */
+                  if (f_i_multibyte
+                      && Fimbexec (beg, len - offset, &kwsmatch.size[0],
+                                   start_ptr == NULL))
+                    goto next_char;
+#endif /* MBS_SUPPORT */
+                  len = kwsmatch.size[0];
+                }
+            }
+        }
+       else
         goto success;
-    } /* for (beg in buf) */
+next_char:;
+#ifdef MBS_SUPPORT
+      /* Advance to next character.  For MB_CUR_MAX == 1 case this is handled
+         by ++beg above.  */
+      if (mb_cur_max > 1)
+        {
+          if (using_utf8)
+            {
+              unsigned char c = *beg;
+              if (c >= 0xc2)
+                {
+                  if (c < 0xe0)
+                    ++beg;
+                  else if (c < 0xf0)
+                    beg += 2;
+                  else if (c < 0xf8)
+                    beg += 3;
+                  else if (c < 0xfc)
+                    beg += 4;
+                  else if (c < 0xfe)
+                    beg += 5;
+                }
+            }
+          else
+            {
+              size_t l = mbrlen (beg, buf + size - beg, &mbs);
 
- failure:
-  ret_val = -1;
-  goto out;
+              last_char = beg;
+              if (l + 2 >= 2)
+                beg += l - 1;
+              else
+                memset (&mbs, '\0', sizeof (mbstate_t));
+            }
+        }
+#endif /* MBS_SUPPORT */
+    }
+
+  return -1;
 
  success:
+#ifdef MBS_SUPPORT
+  if (mb_cur_max > 1 && !using_utf8)
+    {
+      end = beg + len;
+      while (end < buf + size)
+        {
+          size_t mlen = mbrlen (end, buf + size - end, &mbs);
+          if (mlen == (size_t) -1 || mlen == (size_t) -2 || mlen == 0)
+            {
+              memset (&mbs, '\0', sizeof (mbstate_t));
+              mlen = 1;
+            }
+          if (mlen == 1 && *end == eol)
+            break;
+
+          end += mlen;
+        }
+     }
+  else
+ #endif /* MBS_SUPPORT */
   end = memchr (beg + len, eol, (buf + size) - (beg + len));
   end++;
   while (buf < beg && beg[-1] != eol)
@@ -591 +1114 @@
   *match_size = len;
   ret_val = beg - buf;
  out:
-#ifdef MBS_SUPPORT
-  if (MB_CUR_MAX > 1)
-    {
-      if (match_icase)
-        free((char*)buf);
-      if (mb_properties)
-        free(mb_properties);
-    }
-#endif /* MBS_SUPPORT */
   return ret_val;
 }
 #endif /* defined(GREP_PROGRAM) || defined(FGREP_PROGRAM) */