/* Copyright (C) 1991, 1992, 1993, 1996, 1997 Free Software Foundation, Inc.

   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 2, 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, write to the Free Software Foundation,
  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bacula.h"
#include "fnmatch.h"

# ifndef errno
extern int errno;
# endif

/* Match STRING against the filename pattern PATTERN, returning zero if
   it matches, nonzero if not.  */
int
fnmatch (const char *pattern, const char *string, int flags)
{
  register const char *p = pattern, *n = string;
  register char c;

/* Note that this evaluates C many times.  */
# define FOLD(c) ((flags & FNM_CASEFOLD) && B_ISUPPER (c) ? tolower (c) : (c))

  while ((c = *p++) != '\0')
    {
      c = FOLD (c);

      switch (c)
        {
        case '?':
          if (*n == '\0')
            return FNM_NOMATCH;
          else if ((flags & FNM_FILE_NAME) && *n == '/')
            return FNM_NOMATCH;
          else if ((flags & FNM_PERIOD) && *n == '.' &&
                   (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
            return FNM_NOMATCH;
          break;

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

        case '*':
          if ((flags & FNM_PERIOD) && *n == '.' &&
              (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
            return FNM_NOMATCH;

          for (c = *p++; c == '?' || c == '*'; c = *p++)
            {
              if ((flags & FNM_FILE_NAME) && *n == '/')
                /* A slash does not match a wildcard under FNM_FILE_NAME.  */
                return FNM_NOMATCH;
              else if (c == '?')
                {
                  /* A ? needs to match one character.  */
                  if (*n == '\0')
                    /* There isn't another character; no match.  */
                    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 == '\0')
            return 0;

          {
            char c1 = (!(flags & FNM_NOESCAPE) && c == '\\') ? *p : c;
            c1 = FOLD (c1);
            for (--p; *n != '\0'; ++n)
              if ((c == '[' || FOLD ((unsigned char)*n) == c1) &&
                  fnmatch (p, n, flags & ~FNM_PERIOD) == 0)
                return 0;
            return FNM_NOMATCH;
          }

        case '[':
          {
            /* Nonzero if the sense of the character class is inverted.  */
            register int nnot;

            if (*n == '\0')
              return FNM_NOMATCH;

            if ((flags & FNM_PERIOD) && *n == '.' &&
                (n == string || ((flags & FNM_FILE_NAME) && n[-1] == '/')))
              return FNM_NOMATCH;

            nnot = (*p == '!' || *p == '^');
            if (nnot)
              ++p;

            c = *p++;
            for (;;)
              {
                register char cstart = c, cend = c;

                if (!(flags & FNM_NOESCAPE) && c == '\\')
                  {
                    if (*p == '\0')
                      return FNM_NOMATCH;
                    cstart = cend = *p++;
                  }

                cstart = cend = FOLD (cstart);

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

                c = *p++;
                c = FOLD (c);

                if ((flags & FNM_FILE_NAME) && c == '/')
                  /* [/] can never match.  */
                  return FNM_NOMATCH;

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

                    c = *p++;
                  }

                if (FOLD (*n) >= cstart && FOLD (*n) <= cend)
                  goto matched;

                if (c == ']')
                  break;
              }
            if (!nnot)
              return FNM_NOMATCH;
            break;

          matched:;
            /* Skip the rest of the [...] that already matched.  */
            while (c != ']')
              {
                if (c == '\0')
                  /* [... (unterminated) loses.  */
                  return FNM_NOMATCH;

                c = *p++;
                if (!(flags & FNM_NOESCAPE) && c == '\\')
                  {
                    if (*p == '\0')
                      return FNM_NOMATCH;
                    /* XXX 1003.2d11 is unclear if this is right.  */
                    ++p;
                  }
              }
            if (nnot)
              return FNM_NOMATCH;
          }
          break;

        default:
          if (c != FOLD (*n))
            return FNM_NOMATCH;
        }

      ++n;
    }

  if (*n == '\0')
    return 0;

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

  return FNM_NOMATCH;

# undef FOLD
}
