/*
* 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.
+ * Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
+ * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
+ * Patched by a bunch of people. 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
* 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.
- *
*/
#include <stdio.h>
#include <string.h>
#include <dirent.h>
+#include <stdlib.h>
#include "libbb.h"
-extern int find_real_root_device_name(char* name)
+extern char *find_real_root_device_name(const char* name)
{
DIR *dir;
struct dirent *entry;
struct stat statBuf, rootStat;
- char fileName[BUFSIZ];
-
- if (stat("/", &rootStat) != 0) {
- error_msg("could not stat '/'");
- return( FALSE);
- }
+ char *fileName = NULL;
+ dev_t dev;
- dir = opendir("/dev");
- if (!dir) {
- error_msg("could not open '/dev'");
- return( FALSE);
- }
+ if (stat("/", &rootStat) != 0)
+ perror_msg("could not stat '/'");
+ else {
+ if ((dev = rootStat.st_rdev)==0)
+ dev=rootStat.st_dev;
- while((entry = readdir(dir)) != NULL) {
+ dir = opendir("/dev");
+ if (!dir)
+ perror_msg("could not open '/dev'");
+ else {
+ 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;
+ /* Must skip ".." since that is "/", and so we
+ * would get a false positive on ".." */
+ if (strcmp(entry->d_name, "..") == 0)
+ continue;
- snprintf( fileName, strlen(name)+1, "/dev/%s", entry->d_name);
+ fileName = concat_path_file("/dev", entry->d_name);
- if (stat(fileName, &statBuf) != 0)
- continue;
- /* Some char devices have the same dev_t as block
- * devices, so make sure this is a block device */
- if (! S_ISBLK(statBuf.st_mode))
- continue;
- if (statBuf.st_rdev == rootStat.st_rdev) {
- strcpy(name, fileName);
- return ( TRUE);
+ /* 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)
+ break;
+ free(fileName);
+ fileName=NULL;
+ }
+ closedir(dir);
}
}
-
- return( FALSE);
+ if(fileName==NULL)
+ fileName=xstrdup("/dev/root");
+ return fileName;
}