su: make /etc/shells check configurable

[oweals/busybox.git] / libbb / find_root_device.c

diff --git a/libbb/find_root_device.c b/libbb/find_root_device.c
index edfd7085a163140ac3c6b6b4a595d1820934a501..71b79b8d09178950dca2aafb26067740531c552e 100644 (file)
--- a/libbb/find_root_device.c
+++ b/libbb/find_root_device.c
@@ -2,90 +2,32 @@
 /*
  * Utility routines.
  *
- * Copyright (C) tons of folks.  Tracking down who wrote what
- * isn't something I'm going to worry about...  If you wrote something
- * here, please feel free to acknowledge your work.
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
- * Permission has been granted to redistribute this code under the GPL.
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
 
-#include <stdio.h>
-#include <string.h>
-#include <dirent.h>
-#include <stdlib.h>
 #include "libbb.h"
 
-
-
-extern char *find_real_root_device_name(const char* name)
+char *find_block_device(char *path)
 {
        DIR *dir;
        struct dirent *entry;
-       struct stat statBuf, rootStat;
-       char *fileName;
+       struct stat st;
        dev_t dev;
+       char *retpath=NULL;
 
-       if (stat("/", &rootStat) != 0) {
-               perror_msg("could not stat '/'");
-               return NULL;
-       }
-       if ((dev = rootStat.st_rdev)==0) dev=rootStat.st_dev;
-
-       dir = opendir("/dev");
-       if (!dir) {
-               perror_msg("could not open '/dev'");
-               goto fallback;
-       }
-
+       if(stat(path, &st) || !(dir = opendir("/dev"))) return NULL;
+       dev = (st.st_mode & S_IFMT) == S_IFBLK ? st.st_rdev : st.st_dev;
        while((entry = readdir(dir)) != NULL) {
-
-               /* Must skip ".." since that is "/", and so we 
-                * would get a false positive on ".."  */
-               if (strcmp(entry->d_name, "..") == 0)
-                       continue;
-
-               fileName = concat_path_file("/dev/", entry->d_name);
-
-               /* Some char devices have the same dev_t as block
-                * devices, so make sure this is a block device */
-               if (stat(fileName, &statBuf) == 0 && 
-                               S_ISBLK(statBuf.st_mode)!=0 &&
-                               statBuf.st_rdev == dev) {
-                       return fileName; 
+               char devpath[PATH_MAX];
+               sprintf(devpath,"/dev/%s", entry->d_name);
+               if(!stat(devpath, &st) && S_ISBLK(st.st_mode) && st.st_rdev == dev) {
+                       retpath = xstrdup(devpath);
+                       break;
                }
-               free(fileName);
        }
        closedir(dir);
 
-fallback:
-       /* don't use stack space, caller expects to free() result */
-       fileName=xmalloc(20);
-       sprintf(fileName,"(rdev %u)",(unsigned int) rootStat.st_rdev);
-       return fileName;
+       return retpath;
 }
-
-
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/