firmware/common/filefuncs.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Björn Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include "config.h"
  22 #include "dir.h"
  23 #include "stdlib.h"
  24 #include "string.h"
  25 #include "debug.h"
  26
  27 #ifdef HAVE_MULTIVOLUME
  28 /* returns on which volume this is, and copies the reduced name
  29    (sortof a preprocessor for volume-decorated pathnames) */
  30 int strip_volume(const char* name, char* namecopy)
  31 {
  32     int volume = 0;
  33     const char *temp = name;
  34
  35     while (*temp == '/')          /* skip all leading slashes */
  36         ++temp;
  37
  38     if (*temp && !strncmp(temp, VOL_NAMES, VOL_ENUM_POS))
  39     {
  40         temp += VOL_ENUM_POS;     /* behind special name */
  41         volume = atoi(temp);      /* number is following */
  42         temp = strchr(temp, '/'); /* search for slash behind */
  43         if (temp != NULL)
  44             name = temp;          /* use the part behind the volume */
  45         else
  46             name = "/";           /* else this must be the root dir */
  47     }
  48
  49     strlcpy(namecopy, name, MAX_PATH);
  50
  51     return volume;
  52 }
  53 #endif /* #ifdef HAVE_MULTIVOLUME */
  54
  55 #ifndef __PCTOOL__
  56 /* Test file existence, using dircache of possible */
  57 bool file_exists(const char *file)
  58 {
  59     int fd;
  60
  61 #ifdef DEBUG
  62     if (!file || strlen(file) <= 0)
  63     {
  64         DEBUGF("%s(): Invalid parameter!\n");
  65         return false;
  66     }
  67 #endif
  68
  69 #ifdef HAVE_DIRCACHE
  70     if (dircache_is_enabled())
  71         return (dircache_get_entry_ptr(file) != NULL);
  72 #endif
  73
  74     fd = open(file, O_RDONLY);
  75     if (fd < 0)
  76         return false;
  77     close(fd);
  78     return true;
  79 }
  80
  81 bool dir_exists(const char *path)
  82 {
  83     DIR* d = opendir(path);
  84     if (!d)
  85         return false;
  86     closedir(d);
  87     return true;
  88 }
  89 #endif /* __PCTOOL__ */