path: root/lib/fnmatch_loop.c

/* Copyright (C) 1991-1993, 1996-2006, 2009-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

/* Match STRING against the file name pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
static int EXT (INT opt, const CHAR *pattern, const CHAR *string,
                const CHAR *string_end, bool no_leading_period, int flags)
     internal_function;
static const CHAR *END (const CHAR *patternp) internal_function;

static int
internal_function
FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end,
     bool no_leading_period, int flags)
{
  register const CHAR *p = pattern, *n = string;
  register UCHAR c;
#ifdef _LIBC
# if WIDE_CHAR_VERSION
  const char *collseq = (const char *)
    _NL_CURRENT(LC_COLLATE, _NL_COLLATE_COLLSEQWC);
# else
  const UCHAR *collseq = (const UCHAR *)
    _NL_CURRENT(LC_COLLATE, _NL_COLLATE_COLLSEQMB);
# endif
#endif

  while ((c = *p++) != L_('\0'))
    {
      bool new_no_leading_period = false;
      c = FOLD (c);

      switch (c)
        {
        case L_('?'):
          if (__builtin_expect (flags & FNM_EXTMATCH, 0) && *p == '(')
            {
              int res;

              res = EXT (c, p, n, string_end, no_leading_period,
                         flags);
              if (res != -1)
                return res;
            }

          if (n == string_end)
            return FNM_NOMATCH;
          else if (*n == L_('/') && (flags & FNM_FILE_NAME))
            return FNM_NOMATCH;
          else if (*n == L_('.') && no_leading_period)
            return FNM_NOMATCH;
          break;

        case L_('\\'):
          if (!(flags & FNM_NOESCAPE))
            {
              c = *p++;
              if (c == L_('\0'))
                /* Trailing \ loses.  */
                return FNM_NOMATCH;
              c = FOLD (c);
            }
          if (n == string_end || FOLD ((UCHAR) *n) != c)
            return FNM_NOMATCH;
          break;

        case L_('*'):
          if (__builtin_expect (flags & FNM_EXTMATCH, 0) && *p == '(')
            {
              int res;

              res = EXT (c, p, n, string_end, no_leading_period,
                         flags);
              if (res != -1)
                return res;
            }

          if (n != string_end && *n == L_('.') && no_leading_period)
            return FNM_NOMATCH;

          for (c = *p++; c == L_('?') || c == L_('*'); c = *p++)
            {
              if (*p == L_('(') && (flags & FNM_EXTMATCH) != 0)
                {
                  const CHAR *endp = END (p);
                  if (endp != p)
                    {
                      /* This is a pattern.  Skip over it.  */
                      p = endp;
                      continue;
                    }
                }

              if (c == L_('?'))
                {
                  /* A ? needs to match one character.  */
                  if (n == string_end)
                    /* There isn't another character; no match.  */
                    return FNM_NOMATCH;
                  else if (*n == L_('/')
                           && __builtin_expect (flags & FNM_FILE_NAME, 0))
                    /* A slash does not match a wildcard under
                       FNM_FILE_NAME.  */
                    return FNM_NOMATCH;
                  else
                    /* One character of the string is consumed in matching
                       this ? wildcard, so *??? won't match if there are
                       less than three characters.  */
                    ++n;
                }
            }

          if (c == L_('\0'))
            /* The wildcard(s) is/are the last element of the pattern.
               If the name is a file name and contains another slash
               this means it cannot match, unless the FNM_LEADING_DIR
               flag is set.  */
            {
              int result = (flags & FNM_FILE_NAME) == 0 ? 0 : FNM_NOMATCH;

              if (flags & FNM_FILE_NAME)
                {
                  if (flags & FNM_LEADING_DIR)
                    result = 0;
                  else
                    {
                      if (MEMCHR (n, L_('/'), string_end - n) == NULL)
                        result = 0;
                    }
                }

              return result;
            }
          else
            {
              const CHAR *endp;

              endp = MEMCHR (n, (flags & FNM_FILE_NAME) ? L_('/') : L_('\0'),
                             string_end - n);
              if (endp == NULL)
                endp = string_end;

              if (c == L_('[')
                  || (__builtin_expect (flags & FNM_EXTMATCH, 0) != 0
                      && (c == L_('@') || c == L_('+') || c == L_('!'))
                      && *p == L_('(')))
                {
                  int flags2 = ((flags & FNM_FILE_NAME)
                                ? flags : (flags & ~FNM_PERIOD));
                  bool no_leading_period2 = no_leading_period;

                  for (--p; n < endp; ++n, no_leading_period2 = false)
                    if (FCT (p, n, string_end, no_leading_period2, flags2)
                        == 0)
                      return 0;
                }
              else if (c == L_('/') && (flags & FNM_FILE_NAME))
                {
                  while (n < string_end && *n != L_('/'))
                    ++n;
                  if (n < string_end && *n == L_('/')
                      && (FCT (p, n + 1, string_end, flags & FNM_PERIOD, flags)
                          == 0))
                    return 0;
                }
              else
                {
                  int flags2 = ((flags & FNM_FILE_NAME)
                                ? flags : (flags & ~FNM_PERIOD));
                  int no_leading_period2 = no_leading_period;

                  if (c == L_('\\') && !(flags & FNM_NOESCAPE))
                    c = *p;
                  c = FOLD (c);
                  for (--p; n < endp; ++n, no_leading_period2 = false)
                    if (FOLD ((UCHAR) *n) == c
                        && (FCT (p, n, string_end, no_leading_period2, flags2)
                            == 0))
                      return 0;
                }
            }

          /* If we come here no match is possible with the wildcard.  */
          return FNM_NOMATCH;

        case L_('['):
          {
            /* Nonzero if the sense of the character class is inverted.  */
            const CHAR *p_init = p;
            const CHAR *n_init = n;
            register bool not;
            CHAR cold;
            UCHAR fn;

            if (posixly_correct == 0)
              posixly_correct = getenv ("POSIXLY_CORRECT") != NULL ? 1 : -1;

            if (n == string_end)
              return FNM_NOMATCH;

            if (*n == L_('.') && no_leading_period)
              return FNM_NOMATCH;

            if (*n == L_('/') && (flags & FNM_FILE_NAME))
              /* '/' cannot be matched.  */
              return FNM_NOMATCH;

            not = (*p == L_('!') || (posixly_correct < 0 && *p == L_('^')));
            if (not)
              ++p;

            fn = FOLD ((UCHAR) *n);

            c = *p++;
            for (;;)
              {
		bool is_range = false;

                if (!(flags & FNM_NOESCAPE) && c == L_('\\'))
                  {
                    if (*p == L_('\0'))
                      return FNM_NOMATCH;
                    c = FOLD ((UCHAR) *p);
                    ++p;

                    goto normal_bracket;
                  }
                else if (c == L_('[') && *p == L_(':'))
                  {
                    /* Leave room for the null.  */
                    CHAR str[CHAR_CLASS_MAX_LENGTH + 1];
                    size_t c1 = 0;
#if defined _LIBC || WIDE_CHAR_SUPPORT
                    wctype_t wt;
#endif
                    const CHAR *startp = p;

                    for (;;)
                      {
                        if (c1 == CHAR_CLASS_MAX_LENGTH)
                          /* The name is too long and therefore the pattern
                             is ill-formed.  */
                          return FNM_NOMATCH;

                        c = *++p;
                        if (c == L_(':') && p[1] == L_(']'))
                          {
                            p += 2;
                            break;
                          }
                        if (c < L_('a') || c >= L_('z'))
                          {
                            /* This cannot possibly be a character class name.
                               Match it as a normal range.  */
                            p = startp;
                            c = L_('[');
                            goto normal_bracket;
                          }
                        str[c1++] = c;
                      }
                    str[c1] = L_('\0');

#if defined _LIBC || WIDE_CHAR_SUPPORT
                    wt = IS_CHAR_CLASS (str);
                    if (wt == 0)
                      /* Invalid character class name.  */
                      return FNM_NOMATCH;

# if defined _LIBC && ! WIDE_CHAR_VERSION
                    /* The following code is glibc specific but does
                       there a good job in speeding up the code since
                       we can avoid the btowc() call.  */
                    if (_ISCTYPE ((UCHAR) *n, wt))
                      goto matched;
# else
                    if (ISWCTYPE (BTOWC ((UCHAR) *n), wt))
                      goto matched;
# endif
#else
                    if ((STREQ (str, L_("alnum")) && isalnum ((UCHAR) *n))
                        || (STREQ (str, L_("alpha")) && isalpha ((UCHAR) *n))
                        || (STREQ (str, L_("blank")) && isblank ((UCHAR) *n))
                        || (STREQ (str, L_("cntrl")) && iscntrl ((UCHAR) *n))
                        || (STREQ (str, L_("digit")) && isdigit ((UCHAR) *n))
                        || (STREQ (str, L_("graph")) && isgraph ((UCHAR) *n))
                        || (STREQ (str, L_("lower")) && islower ((UCHAR) *n))
                        || (STREQ (str, L_("print")) && isprint ((UCHAR) *n))
                        || (STREQ (str, L_("punct")) && ispunct ((UCHAR) *n))
                        || (STREQ (str, L_("space")) && isspace ((UCHAR) *n))
                        || (STREQ (str, L_("upper")) && isupper ((UCHAR) *n))
                        || (STREQ (str, L_("xdigit")) && isxdigit ((UCHAR) *n)))
                      goto matched;
#endif
                    c = *p++;
                  }
#ifdef _LIBC
                else if (c == L_('[') && *p == L_('='))
                  {
                    UCHAR str[1];
                    uint32_t nrules =
                      _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
                    const CHAR *startp = p;

                    c = *++p;
                    if (c == L_('\0'))
                      {
                        p = startp;
                        c = L_('[');
                        goto normal_bracket;
                      }
                    str[0] = c;

                    c = *++p;
                    if (c != L_('=') || p[1] != L_(']'))
                      {
                        p = startp;
                        c = L_('[');
                        goto normal_bracket;
                      }
                    p += 2;

                    if (nrules == 0)
                      {
                        if ((UCHAR) *n == str[0])
                          goto matched;
                      }
                    else
                      {
                        const int32_t *table;
# if WIDE_CHAR_VERSION
                        const int32_t *weights;
                        const int32_t *extra;
# else
                        const unsigned char *weights;
                        const unsigned char *extra;
# endif
                        const int32_t *indirect;
                        int32_t idx;
                        const UCHAR *cp = (const UCHAR *) str;

                        /* This #include defines a local function!  */
# if WIDE_CHAR_VERSION
#  include <locale/weightwc.h>
# else
#  include <locale/weight.h>
# endif

# if WIDE_CHAR_VERSION
                        table = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEWC);
                        weights = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTWC);
                        extra = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAWC);
                        indirect = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTWC);
# else
                        table = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
                        weights = (const unsigned char *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB);
                        extra = (const unsigned char *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
                        indirect = (const int32_t *)
                          _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB);
# endif

                        idx = findidx (&cp);
                        if (idx != 0)
                          {
                            /* We found a table entry.  Now see whether the
                               character we are currently at has the same
                               equivalence class value.  */
                            int len = weights[idx & 0xffffff];
                            int32_t idx2;
                            const UCHAR *np = (const UCHAR *) n;

                            idx2 = findidx (&np);
                            if (idx2 != 0
                                && (idx >> 24) == (idx2 >> 24)
                                && len == weights[idx2 & 0xffffff])
                              {
                                int cnt = 0;

                                idx &= 0xffffff;
                                idx2 &= 0xffffff;

                                while (cnt < len
                                       && (weights[idx + 1 + cnt]
                                           == weights[idx2 + 1 + cnt]))
                                  ++cnt;

                                if (cnt == len)
                                  goto matched;
                              }
                          }
                      }

                    c = *p++;
                  }
#endif
                else if (c == L_('\0'))
                  {
                    /* [ unterminated, treat as normal character.  */
                    p = p_init;
                    n = n_init;
                    c = L_('[');
                    goto normal_match;
                  }
                else
                  {
#ifdef _LIBC
                    bool is_seqval = false;

                    if (c == L_('[') && *p == L_('.'))
                      {
                        uint32_t nrules =
                          _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
                        const CHAR *startp = p;
                        size_t c1 = 0;

                        while (1)
                          {
                            c = *++p;
                            if (c == L_('.') && p[1] == L_(']'))
                              {
                                p += 2;
                                break;
                              }
                            if (c == '\0')
                              return FNM_NOMATCH;
                            ++c1;
                          }

                        /* We have to handling the symbols differently in
                           ranges since then the collation sequence is
                           important.  */
                        is_range = *p == L_('-') && p[1] != L_('\0');

                        if (nrules == 0)
                          {
                            /* There are no names defined in the collation
                               data.  Therefore we only accept the trivial
                               names consisting of the character itself.  */
                            if (c1 != 1)
                              return FNM_NOMATCH;

                            if (!is_range && *n == startp[1])
                              goto matched;

                            cold = startp[1];
                            c = *p++;
                          }
                        else
                          {
                            int32_t table_size;
                            const int32_t *symb_table;
# ifdef WIDE_CHAR_VERSION
                            char str[c1];
                            size_t strcnt;
# else
#  define str (startp + 1)
# endif
                            const unsigned char *extra;
                            int32_t idx;
                            int32_t elem;
                            int32_t second;
                            int32_t hash;

# ifdef WIDE_CHAR_VERSION
                            /* We have to convert the name to a single-byte
                               string.  This is possible since the names
                               consist of ASCII characters and the internal
                               representation is UCS4.  */
                            for (strcnt = 0; strcnt < c1; ++strcnt)
                              str[strcnt] = startp[1 + strcnt];
# endif

                            table_size =
                              _NL_CURRENT_WORD (LC_COLLATE,
                                                _NL_COLLATE_SYMB_HASH_SIZEMB);
                            symb_table = (const int32_t *)
                              _NL_CURRENT (LC_COLLATE,
                                           _NL_COLLATE_SYMB_TABLEMB);
                            extra = (const unsigned char *)
                              _NL_CURRENT (LC_COLLATE,
                                           _NL_COLLATE_SYMB_EXTRAMB);

                            /* Locate the character in the hashing table.  */
                            hash = elem_hash (str, c1);

                            idx = 0;
                            elem = hash % table_size;
                            if (symb_table[2 * elem] != 0)
                              {
                                second = hash % (table_size - 2) + 1;

                                do
                                  {
                                    /* First compare the hashing value.  */
                                    if (symb_table[2 * elem] == hash
                                        && (c1
                                            == extra[symb_table[2 * elem + 1]])
                                        && memcmp (str,
                                                   &extra[symb_table[2 * elem
                                                                     + 1]
                                                          + 1], c1) == 0)
                                      {
                                        /* Yep, this is the entry.  */
                                        idx = symb_table[2 * elem + 1];
                                        idx += 1 + extra[idx];
                                        break;
                                      }

                                    /* Next entry.  */
                                    elem += second;
                                  }
                                while (symb_table[2 * elem] != 0);
                              }

                            if (symb_table[2 * elem] != 0)
                              {
                                /* Compare the byte sequence but only if
                                   this is not part of a range.  */
# ifdef WIDE_CHAR_VERSION
                                int32_t *wextra;

                                idx += 1 + extra[idx];
                                /* Adjust for the alignment.  */
                                idx = (idx + 3) & ~3;

                                wextra = (int32_t *) &extra[idx + 4];
# endif

                                if (! is_range)
                                  {
# ifdef WIDE_CHAR_VERSION
                                    for (c1 = 0;
                                         (int32_t) c1 < wextra[idx];
                                         ++c1)
                                      if (n[c1] != wextra[1 + c1])
                                        break;

                                    if ((int32_t) c1 == wextra[idx])
                                      goto matched;
# else
                                    for (c1 = 0; c1 < extra[idx]; ++c1)
                                      if (n[c1] != extra[1 + c1])
                                        break;

                                    if (c1 == extra[idx])
                                      goto matched;
# endif
                                  }

                                /* Get the collation sequence value.  */
                                is_seqval = true;
# ifdef WIDE_CHAR_VERSION
                                cold = wextra[1 + wextra[idx]];
# else
                                /* Adjust for the alignment.  */
                                idx += 1 + extra[idx];
                                idx = (idx + 3) & ~4;
                                cold = *((int32_t *) &extra[idx]);
# endif

                                c = *p++;
                              }
                            else if (c1 == 1)
                              {
                                /* No valid character.  Match it as a
                                   single byte.  */
                                if (!is_range && *n == str[0])
                                  goto matched;

                                cold = str[0];
                                c = *p++;
                              }
                            else
                              return FNM_NOMATCH;
                          }
                      }
                    else
# undef str
#endif
                      {
                        c = FOLD (c);
                      normal_bracket:

                        /* We have to handling the symbols differently in
                           ranges since then the collation sequence is
                           important.  */
                        is_range = (*p == L_('-') && p[1] != L_('\0')
                                    && p[1] != L_(']'));

                        if (!is_range && c == fn)
                          goto matched;

#if _LIBC
                        /* This is needed if we goto normal_bracket; from
                           outside of is_seqval's scope.  */
                        is_seqval = false;
#endif

                        cold = c;
                        c = *p++;
                      }

                    if (c == L_('-') && *p != L_(']'))
                      {
#if _LIBC
                        /* We have to find the collation sequence
                           value for C.  Collation sequence is nothing
                           we can regularly access.  The sequence
                           value is defined by the order in which the
                           definitions of the collation values for the
                           various characters appear in the source
                           file.  A strange concept, nowhere
                           documented.  */
                        uint32_t fcollseq;
                        uint32_t lcollseq;
                        UCHAR cend = *p++;

# ifdef WIDE_CHAR_VERSION
                        /* Search in the 'names' array for the characters.  */
                        fcollseq = __collseq_table_lookup (collseq, fn);
                        if (fcollseq == ~((uint32_t) 0))
                          /* XXX We don't know anything about the character
                             we are supposed to match.  This means we are
                             failing.  */
                          goto range_not_matched;

                        if (is_seqval)
                          lcollseq = cold;
                        else
                          lcollseq = __collseq_table_lookup (collseq, cold);
# else
                        fcollseq = collseq[fn];
                        lcollseq = is_seqval ? cold : collseq[(UCHAR) cold];
# endif

                        is_seqval = false;
                        if (cend == L_('[') && *p == L_('.'))
                          {
                            uint32_t nrules =
                              _NL_CURRENT_WORD (LC_COLLATE,
                                                _NL_COLLATE_NRULES);
                            const CHAR *startp = p;
                            size_t c1 = 0;

                            while (1)
                              {
                                c = *++p;
                                if (c == L_('.') && p[1] == L_(']'))
                                  {
                                    p += 2;
                                    break;
                                  }
                                if (c == '\0')
                                  return FNM_NOMATCH;
                                ++c1;
                              }

                            if (nrules == 0)
                              {
                                /* There are no names defined in the
                                   collation data.  Therefore we only
                                   accept the trivial names consisting
                                   of the character itself.  */
                                if (c1 != 1)
                                  return FNM_NOMATCH;

                                cend = startp[1];
                              }
                            else
                              {
                                int32_t table_size;
                                const int32_t *symb_table;
# ifdef WIDE_CHAR_VERSION
                                char str[c1];
                                size_t strcnt;
# else
#  define str (startp + 1)
# endif
                                const unsigned char *extra;
                                int32_t idx;
                                int32_t elem;
                                int32_t second;
                                int32_t hash;

# ifdef WIDE_CHAR_VERSION
                                /* We have to convert the name to a single-byte
                                   string.  This is possible since the names
                                   consist of ASCII characters and the internal
                                   representation is UCS4.  */
                                for (strcnt = 0; strcnt < c1; ++strcnt)
                                  str[strcnt] = startp[1 + strcnt];
# endif

                                table_size =
                                  _NL_CURRENT_WORD (LC_COLLATE,
                                                    _NL_COLLATE_SYMB_HASH_SIZEMB);
                                symb_table = (const int32_t *)
                                  _NL_CURRENT (LC_COLLATE,
                                               _NL_COLLATE_SYMB_TABLEMB);
                                extra = (const unsigned char *)
                                  _NL_CURRENT (LC_COLLATE,
                                               _NL_COLLATE_SYMB_EXTRAMB);

                                /* Locate the character in the hashing
                                   table.  */
                                hash = elem_hash (str, c1);

                                idx = 0;
                                elem = hash % table_size;
                                if (symb_table[2 * elem] != 0)
                                  {
                                    second = hash % (table_size - 2) + 1;

                                    do
                                      {
                                        /* First compare the hashing value.  */
                                        if (symb_table[2 * elem] == hash
                                            && (c1
                                                == extra[symb_table[2 * elem + 1]])
                                            && memcmp (str,
                                                       &extra[symb_table[2 * elem + 1]
                                                              + 1], c1) == 0)
                                          {
                                            /* Yep, this is the entry.  */
                                            idx = symb_table[2 * elem + 1];
                                            idx += 1 + extra[idx];
                                            break;
                                          }

                                        /* Next entry.  */
                                        elem += second;
                                      }
                                    while (symb_table[2 * elem] != 0);
                                  }

                                if (symb_table[2 * elem] != 0)
                                  {
                                    /* Compare the byte sequence but only if
                                       this is not part of a range.  */
# ifdef WIDE_CHAR_VERSION
                                    int32_t *wextra;

                                    idx += 1 + extra[idx];
                                    /* Adjust for the alignment.  */
                                    idx = (idx + 3) & ~4;

                                    wextra = (int32_t *) &extra[idx + 4];
# endif
                                    /* Get the collation sequence value.  */
                                    is_seqval = true;
# ifdef WIDE_CHAR_VERSION
                                    cend = wextra[1 + wextra[idx]];
# else
                                    /* Adjust for the alignment.  */
                                    idx += 1 + extra[idx];
                                    idx = (idx + 3) & ~4;
                                    cend = *((int32_t *) &extra[idx]);
# endif
                                  }
                                else if (symb_table[2 * elem] != 0 && c1 == 1)
                                  {
                                    cend = str[0];
                                    c = *p++;
                                  }
                                else
                                  return FNM_NOMATCH;
                              }
# undef str
                          }
                        else
                          {
                            if (!(flags & FNM_NOESCAPE) && cend == L_('\\'))
                              cend = *p++;
                            if (cend == L_('\0'))
                              return FNM_NOMATCH;
                            cend = FOLD (cend);
                          }

                        /* XXX It is not entirely clear to me how to handle
                           characters which are not mentioned in the
                           collation specification.  */
                        if (
# ifdef WIDE_CHAR_VERSION
                            lcollseq == 0xffffffff ||
# endif
                            lcollseq <= fcollseq)
                          {
                            /* We have to look at the upper bound.  */
                            uint32_t hcollseq;

                            if (is_seqval)
                              hcollseq = cend;
                            else
                              {
# ifdef WIDE_CHAR_VERSION
                                hcollseq =
                                  __collseq_table_lookup (collseq, cend);
                                if (hcollseq == ~((uint32_t) 0))
                                  {
                                    /* Hum, no information about the upper
                                       bound.  The matching succeeds if the
                                       lower bound is matched exactly.  */
                                    if (lcollseq != fcollseq)
                                      goto range_not_matched;

                                    goto matched;
                                  }
# else
                                hcollseq = collseq[cend];
# endif
                              }

                            if (lcollseq <= hcollseq && fcollseq <= hcollseq)
                              goto matched;
                          }
# ifdef WIDE_CHAR_VERSION
                      range_not_matched:
# endif
#else
                        /* We use a boring value comparison of the character
                           values.  This is better than comparing using
                           'strcoll' since the latter would have surprising
                           and sometimes fatal consequences.  */
                        UCHAR cend = *p++;

                        if (!(flags & FNM_NOESCAPE) && cend == L_('\\'))
                          cend = *p++;
                        if (cend == L_('\0'))
                          return FNM_NOMATCH;

                        /* It is a range.  */
                        if (cold <= fn && fn <= cend)
                          goto matched;
#endif

                        c = *p++;
                      }
                  }

                if (c == L_(']'))
                  break;
              }

            if (!not)
              return FNM_NOMATCH;
            break;

          matched:
            /* Skip the rest of the [...] that already matched.  */
            do
              {
              ignore_next:
                c = *p++;

                if (c == L_('\0'))
                  /* [... (unterminated) loses.  */
                  return FNM_NOMATCH;

                if (!(flags & FNM_NOESCAPE) && c == L_('\\'))
                  {
                    if (*p == L_('\0'))
                      return FNM_NOMATCH;
                    /* XXX 1003.2d11 is unclear if this is right.  */
                    ++p;
                  }
                else if (c == L_('[') && *p == L_(':'))
                  {
                    int c1 = 0;
                    const CHAR *startp = p;

                    while (1)
                      {
                        c = *++p;
                        if (++c1 == CHAR_CLASS_MAX_LENGTH)
                          return FNM_NOMATCH;

                        if (*p == L_(':') && p[1] == L_(']'))
                          break;

                        if (c < L_('a') || c >= L_('z'))
                          {
                            p = startp;
                            goto ignore_next;
                          }
                      }
                    p += 2;
                    c = *p++;
                  }
                else if (c == L_('[') && *p == L_('='))
                  {
                    c = *++p;
                    if (c == L_('\0'))
                      return FNM_NOMATCH;
                    c = *++p;
                    if (c != L_('=') || p[1] != L_(']'))
                      return FNM_NOMATCH;
                    p += 2;
                    c = *p++;
                  }
                else if (c == L_('[') && *p == L_('.'))
                  {
                    ++p;
                    while (1)
                      {
                        c = *++p;
                        if (c == '\0')
                          return FNM_NOMATCH;

                        if (*p == L_('.') && p[1] == L_(']'))
                          break;
                      }
                    p += 2;
                    c = *p++;
                  }
              }
            while (c != L_(']'));
            if (not)
              return FNM_NOMATCH;
          }
          break;

        case L_('+'):
        case L_('@'):
        case L_('!'):
          if (__builtin_expect (flags & FNM_EXTMATCH, 0) && *p == '(')
            {
              int res;

              res = EXT (c, p, n, string_end, no_leading_period, flags);
              if (res != -1)
                return res;
            }
          goto normal_match;

        case L_('/'):
          if (NO_LEADING_PERIOD (flags))
            {
              if (n == string_end || c != (UCHAR) *n)
                return FNM_NOMATCH;

              new_no_leading_period = true;
              break;
            }
          FALLTHROUGH;
        default:
        normal_match:
          if (n == string_end || c != FOLD ((UCHAR) *n))
            return FNM_NOMATCH;
        }

      no_leading_period = new_no_leading_period;
      ++n;
    }

  if (n == string_end)
    return 0;

  if ((flags & FNM_LEADING_DIR) && n != string_end && *n == L_('/'))
    /* The FNM_LEADING_DIR flag says that "foo*" matches "foobar/frobozz".  */
    return 0;

  return FNM_NOMATCH;
}


static const CHAR *
internal_function
END (const CHAR *pattern)
{
  const CHAR *p = pattern;

  while (1)
    if (*++p == L_('\0'))
      /* This is an invalid pattern.  */
      return pattern;
    else if (*p == L_('['))
      {
        /* Handle brackets special.  */
        if (posixly_correct == 0)
          posixly_correct = getenv ("POSIXLY_CORRECT") != NULL ? 1 : -1;

        /* Skip the not sign.  We have to recognize it because of a possibly
           following ']'.  */
        if (*++p == L_('!') || (posixly_correct < 0 && *p == L_('^')))
          ++p;
        /* A leading ']' is recognized as such.  */
        if (*p == L_(']'))
          ++p;
        /* Skip over all characters of the list.  */
        while (*p != L_(']'))
          if (*p++ == L_('\0'))
            /* This is no valid pattern.  */
            return pattern;
      }
    else if ((*p == L_('?') || *p == L_('*') || *p == L_('+') || *p == L_('@')
              || *p == L_('!')) && p[1] == L_('('))
      p = END (p + 1);
    else if (*p == L_(')'))
      break;

  return p + 1;
}


static int
internal_function
EXT (INT opt, const CHAR *pattern, const CHAR *string, const CHAR *string_end,
     bool no_leading_period, int flags)
{
  const CHAR *startp;
  size_t level;
  struct patternlist
  {
    struct patternlist *next;
    CHAR str[FLEXIBLE_ARRAY_MEMBER];
  } *list = NULL;
  struct patternlist **lastp = &list;
  size_t pattern_len = STRLEN (pattern);
  const CHAR *p;
  const CHAR *rs;
  enum { ALLOCA_LIMIT = 8000 };

  /* Parse the pattern.  Store the individual parts in the list.  */
  level = 0;
  for (startp = p = pattern + 1; ; ++p)
    if (*p == L_('\0'))
      /* This is an invalid pattern.  */
      return -1;
    else if (*p == L_('['))
      {
        /* Handle brackets special.  */
        if (posixly_correct == 0)
          posixly_correct = getenv ("POSIXLY_CORRECT") != NULL ? 1 : -1;

        /* Skip the not sign.  We have to recognize it because of a possibly
           following ']'.  */
        if (*++p == L_('!') || (posixly_correct < 0 && *p == L_('^')))
          ++p;
        /* A leading ']' is recognized as such.  */
        if (*p == L_(']'))
          ++p;
        /* Skip over all characters of the list.  */
        while (*p != L_(']'))
          if (*p++ == L_('\0'))
            /* This is no valid pattern.  */
            return -1;
      }
    else if ((*p == L_('?') || *p == L_('*') || *p == L_('+') || *p == L_('@')
              || *p == L_('!')) && p[1] == L_('('))
      /* Remember the nesting level.  */
      ++level;
    else if (*p == L_(')'))
      {
        if (level-- == 0)
          {
            /* This means we found the end of the pattern.  */
#define NEW_PATTERN \
            struct patternlist *newp;                                         \
            size_t plen;                                                      \
            size_t plensize;                                                  \
            size_t newpsize;                                                  \
                                                                              \
            plen = (opt == L_('?') || opt == L_('@')                          \
                    ? pattern_len                                             \
                    : p - startp + 1UL);                                      \
            plensize = plen * sizeof (CHAR);                                  \
            newpsize = FLEXSIZEOF (struct patternlist, str, plensize);        \
            if ((size_t) -1 / sizeof (CHAR) < plen                            \
                || newpsize < offsetof (struct patternlist, str)              \
                || ALLOCA_LIMIT <= newpsize)                                  \
              return -1;                                                      \
            newp = (struct patternlist *) alloca (newpsize);                  \
            *((CHAR *) MEMPCPY (newp->str, startp, p - startp)) = L_('\0');    \
            newp->next = NULL;                                                \
            *lastp = newp;                                                    \
            lastp = &newp->next
            NEW_PATTERN;
            break;
          }
      }
    else if (*p == L_('|'))
      {
        if (level == 0)
          {
            NEW_PATTERN;
            startp = p + 1;
          }
      }
  assert (list != NULL);
  assert (p[-1] == L_(')'));
#undef NEW_PATTERN

  switch (opt)
    {
    case L_('*'):
      if (FCT (p, string, string_end, no_leading_period, flags) == 0)
        return 0;
      FALLTHROUGH;
    case L_('+'):
      do
        {
          for (rs = string; rs <= string_end; ++rs)
            /* First match the prefix with the current pattern with the
               current pattern.  */
            if (FCT (list->str, string, rs, no_leading_period,
                     flags & FNM_FILE_NAME ? flags : flags & ~FNM_PERIOD) == 0
                /* This was successful.  Now match the rest with the rest
                   of the pattern.  */
                && (FCT (p, rs, string_end,
                         rs == string
                         ? no_leading_period
                         : rs[-1] == '/' && NO_LEADING_PERIOD (flags),
                         flags & FNM_FILE_NAME
                         ? flags : flags & ~FNM_PERIOD) == 0
                    /* This didn't work.  Try the whole pattern.  */
                    || (rs != string
                        && FCT (pattern - 1, rs, string_end,
                                rs == string
                                ? no_leading_period
                                : rs[-1] == '/' && NO_LEADING_PERIOD (flags),
                                flags & FNM_FILE_NAME
                                ? flags : flags & ~FNM_PERIOD) == 0)))
              /* It worked.  Signal success.  */
              return 0;
        }
      while ((list = list->next) != NULL);

      /* None of the patterns lead to a match.  */
      return FNM_NOMATCH;

    case L_('?'):
      if (FCT (p, string, string_end, no_leading_period, flags) == 0)
        return 0;
      FALLTHROUGH;
    case L_('@'):
      do
        /* I cannot believe it but 'strcat' is actually acceptable
           here.  Match the entire string with the prefix from the
           pattern list and the rest of the pattern following the
           pattern list.  */
        if (FCT (STRCAT (list->str, p), string, string_end,
                 no_leading_period,
                 flags & FNM_FILE_NAME ? flags : flags & ~FNM_PERIOD) == 0)
          /* It worked.  Signal success.  */
          return 0;
      while ((list = list->next) != NULL);

      /* None of the patterns lead to a match.  */
      return FNM_NOMATCH;

    case L_('!'):
      for (rs = string; rs <= string_end; ++rs)
        {
          struct patternlist *runp;

          for (runp = list; runp != NULL; runp = runp->next)
            if (FCT (runp->str, string, rs,  no_leading_period,
                     flags & FNM_FILE_NAME ? flags : flags & ~FNM_PERIOD) == 0)
              break;

          /* If none of the patterns matched see whether the rest does.  */
          if (runp == NULL
              && (FCT (p, rs, string_end,
                       rs == string
                       ? no_leading_period
                       : rs[-1] == '/' && NO_LEADING_PERIOD (flags),
                       flags & FNM_FILE_NAME ? flags : flags & ~FNM_PERIOD)
                  == 0))
            /* This is successful.  */
            return 0;
        }

      /* None of the patterns together with the rest of the pattern
         lead to a match.  */
      return FNM_NOMATCH;

    default:
      assert (! "Invalid extended matching operator");
      break;
    }

  return -1;
}


#undef FOLD
#undef CHAR
#undef UCHAR
#undef INT
#undef FCT
#undef EXT
#undef END
#undef MEMPCPY
#undef MEMCHR
#undef STRLEN
#undef STRCAT
#undef L_
#undef BTOWC