/* $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;

 }