~drizzle-trunk/drizzle/development

/* Copyright (C) 2000 MySQL AB

   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; version 2 of the License.

   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 */

/* Funktions for comparing with wild-cards */

#include "mysys_priv.h"

	/* Test if a string is "comparable" to a wild-card string */

	/* returns 0 if the strings are "comparable" */

char wild_many='*';

char wild_one='?';

char wild_prefix=0; /* QQ this can potentially cause a SIGSEGV */

int wild_compare(register const char *str, register const char *wildstr,

                 bool str_is_pattern)

{

  char cmp;

  while (*wildstr)

  {

    while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)

    {

      if (*wildstr == wild_prefix && wildstr[1])

      {

	wildstr++;

        if (str_is_pattern && *str++ != wild_prefix)

          return(1);

      }

      if (*wildstr++ != *str++)

        return(1);

    }

    if (! *wildstr )

      return(*str != 0);

    if (*wildstr++ == wild_one)

    {

      if (! *str || (str_is_pattern && *str == wild_many))

        return(1);                     /* One char; skip */

      if (*str++ == wild_prefix && str_is_pattern && *str)

        str++;

    }

    else

    {						/* Found '*' */

      while (str_is_pattern && *str == wild_many)

        str++;

      for (; *wildstr ==  wild_many || *wildstr == wild_one; wildstr++)

        if (*wildstr == wild_many)

        {

          while (str_is_pattern && *str == wild_many)

            str++;

        }

        else

        {

          if (str_is_pattern && *str == wild_prefix && str[1])

            str+=2;

          else if (! *str++)

            return (1);

        }

      if (!*wildstr)

        return(0);		/* '*' as last char: OK */

      if ((cmp= *wildstr) == wild_prefix && wildstr[1] && !str_is_pattern)

        cmp=wildstr[1];

      for (;;str++)

      {

        while (*str && *str != cmp)

          str++;

        if (!*str)

          return (1);

	if (wild_compare(str,wildstr,str_is_pattern) == 0)

          return (0);

      }

      /* We will never come here */

    }

  }

  return (*str != 0);

} /* wild_compare */