/* $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp $ */

/*

 * Copyright (c) 2004, Richard Levitte <richard@levitte.org>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

 /*

 © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 */

#include <stddef.h>

#include <stdlib.h>

#include <limits.h>

#include <string.h>

#include <sys/types.h>

#include <dirent.h>

#include <errno.h>

#if !defined(SYMBIAN)

#ifndef LPDIR_H

#include "LPdir.h"

#endif

#endif

/* The POSIXly macro for the maximum number of characters in a file path

   is NAME_MAX.  However, some operating systems use PATH_MAX instead.

   Therefore, it seems natural to first check for PATH_MAX and use that,

   and if it doesn't exist, use NAME_MAX. */

#if defined(PATH_MAX)

# define LP_ENTRY_SIZE PATH_MAX

#elif defined(NAME_MAX)

# define LP_ENTRY_SIZE NAME_MAX

#endif

/* Of course, there's the possibility that neither PATH_MAX nor NAME_MAX

   exist.  It's also possible that NAME_MAX exists but is define to a

   very small value (HP-UX offers 14), so we need to check if we got a

   result, and if it meets a minimum standard, and create or change it

   if not. */

#if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255

# undef LP_ENTRY_SIZE

# define LP_ENTRY_SIZE 255

#endif

struct LP_dir_context_st

{

  DIR *dir;

  char entry_name[LP_ENTRY_SIZE+1];

};

EXPORT_C const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)

{

  struct dirent *direntry = NULL;

  if (ctx == NULL || directory == NULL)

    {

      errno = EINVAL;

      return 0;

    }

  errno = 0;

  if (*ctx == NULL)

    {

      *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));

      if (*ctx == NULL)

	{

	  errno = ENOMEM;

	  return 0;

	}

      memset(*ctx, '\0', sizeof(LP_DIR_CTX));

      (*ctx)->dir = opendir(directory);

      if ((*ctx)->dir == NULL)

	{

	  int save_errno = errno; /* Probably not needed, but I'm paranoid */

	  free(*ctx);

	  *ctx = NULL;

	  errno = save_errno;

	  return 0;

	}

    }

  direntry = readdir((*ctx)->dir);

  if (direntry == NULL)

    {

      return 0;

    }

  strncpy((*ctx)->entry_name, direntry->d_name, sizeof((*ctx)->entry_name) - 1);

  (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';

  return (*ctx)->entry_name;

}

EXPORT_C int LP_find_file_end(LP_DIR_CTX **ctx)

{

  if (ctx != NULL && *ctx != NULL)

    {

      int ret = closedir((*ctx)->dir);

      free(*ctx);

      switch (ret)

	{

	case 0:

	  return 1;

	case -1:

	  return 0;

	default:

	  break;

	}

    }

  errno = EINVAL;

  return 0;

}