~drizzle-trunk/drizzle/development

/* Copyright (C) 2007 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 */

#include "mysys/mysys_priv.h"

#include <mystrings/m_string.h>                           /* strcmp() */

/**

  Append str to array, or move to the end if it already exists

  @param str    String to be appended

  @param array  The array, terminated by a NULL element, all unused elements

                pre-initialized to NULL

  @param size   Size of the array; array must be terminated by a NULL

                pointer, so can hold size - 1 elements

  @retval false  Success

  @retval true   Failure, array is full

*/

bool array_append_string_unique(const char *str,

                                   const char **array, size_t size)

{

  const char **p;

  /* end points at the terminating NULL element */

  const char **end= array + size - 1;

  assert(*end == NULL);

  for (p= array; *p; ++p)

  {

    if (strcmp(*p, str) == 0)

      break;

  }

  if (p >= end)

    return true;                               /* Array is full */

  assert(*p == NULL || strcmp(*p, str) == 0);

  while (*(p + 1))

  {

    *p= *(p + 1);

    ++p;

  }

  assert(p < end);

  *p= str;

  return false;                                 /* Success */

}