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 #include "file.h"
  27 #include "filefuncs.h"
  28 #include "string-extra.h"
  29
  30 #ifndef __PCTOOL__
  31 #ifdef HAVE_MULTIVOLUME
  32
  33 /* returns on which volume this is, and copies the reduced name
  34    (sortof a preprocessor for volume-decorated pathnames) */
  35 int strip_volume(const char* name, char* namecopy)
  36 {
  37     int volume = 0;
  38     const char *temp = name;
  39
  40     while (*temp == '/')          /* skip all leading slashes */
  41         ++temp;
  42
  43     if (*temp && !strncmp(temp, VOL_NAMES, VOL_ENUM_POS))
  44     {
  45         temp += VOL_ENUM_POS;     /* behind special name */
  46         volume = atoi(temp);      /* number is following */
  47         temp = strchr(temp, '/'); /* search for slash behind */
  48         if (temp != NULL)
  49             name = temp;          /* use the part behind the volume */
  50         else
  51             name = "/";           /* else this must be the root dir */
  52     }
  53
  54     strlcpy(namecopy, name, MAX_PATH);
  55
  56     return volume;
  57 }
  58 #endif /* #ifdef HAVE_MULTIVOLUME */
  59
  60 #endif /* __PCTOOL__ */
  61 /* Test file existence, using dircache of possible */
  62 bool file_exists(const char *file)
  63 {
  64     int fd;
  65
  66 #ifdef DEBUG
  67     if (!file || !*file)
  68     {
  69         DEBUGF("%s(%p): Invalid parameter!\n", __func__, file);
  70         return false;
  71     }
  72 #endif
  73
  74 #ifdef HAVE_DIRCACHE
  75     if (dircache_is_enabled())
  76         return (dircache_get_entry_id(file) >= 0);
  77 #endif
  78
  79     fd = open(file, O_RDONLY);
  80     if (fd < 0)
  81         return false;
  82     close(fd);
  83     return true;
  84 }
  85
  86 bool dir_exists(const char *path)
  87 {
  88     DIR* d = opendir(path);
  89     if (!d)
  90         return false;
  91     closedir(d);
  92     return true;
  93 }
  94
  95
  96 #if (CONFIG_PLATFORM & (PLATFORM_NATIVE|PLATFORM_SDL|PLATFORM_MAEMO|PLATFORM_PANDORA))
  97 struct dirinfo dir_get_info(DIR* parent, struct dirent *entry)
  98 {
  99     (void)parent;
 100     return entry->info;
 101 }
 102 #endif