merge with 0.30.213

[util-vserver.git] / lib / comparevserverbyid.c

diff --git a/lib/comparevserverbyid.c b/lib/comparevserverbyid.c
new file mode 100644 (file)
index 0000000..61a9ccf
--- /dev/null
+++ b/lib/comparevserverbyid.c
@@ -0,0 +1,83 @@
+// $Id: comparevserverbyid.c 2180 2005-10-25 16:17:12Z ensc $    --*- c -*--
+
+// Copyright (C) 2005 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "vserver.h"
+#include "pathconfig.h"
+
+#include <sys/stat.h>
+#include <string.h>
+
+static char const *
+completePath(char const *id, size_t len, vcCfgStyle style, char *buf)
+{
+  switch (style) {
+    case vcCFG_RECENT_FULL     :  return id;
+    case vcCFG_RECENT_SHORT    :
+      memcpy(buf,              CONFDIR "/", sizeof(CONFDIR "/")-1);
+      memcpy(buf+sizeof(CONFDIR "/")-1, id, len+1);    // appends '\0' implicitly
+      return buf;
+    default                    :  return 0;
+  }
+}
+
+int
+vc_compareVserverById(char const *lhs, vcCfgStyle lhs_style,
+                     char const *rhs, vcCfgStyle rhs_style)
+{
+  if (lhs_style==vcCFG_NONE || lhs_style==vcCFG_AUTO)
+    lhs_style = vc_getVserverCfgStyle(lhs);
+
+  if (rhs_style==vcCFG_NONE || rhs_style==vcCFG_AUTO)
+    rhs_style = vc_getVserverCfgStyle(rhs);
+
+    // compare legacy vservers by their names only resp. return false on mixed
+    // styles
+  if (lhs_style==vcCFG_LEGACY || rhs_style==vcCFG_LEGACY) {
+    if (lhs_style!=rhs_style) return lhs_style - rhs_style;
+    else                      return strcmp(lhs, rhs);
+  }
+
+  {
+    size_t             len_lhs = strlen(lhs);
+    size_t             len_rhs = strlen(rhs);
+    char               buf_lhs[sizeof(CONFDIR "//") + len_lhs];
+    char               buf_rhs[sizeof(CONFDIR "//") + len_rhs];
+
+    char const *       path_lhs = completePath(lhs, len_lhs, lhs_style, buf_lhs);
+    char const *       path_rhs = (path_lhs==0
+                                   ? 0 // skip following calculation
+                                   : completePath(rhs, len_rhs, rhs_style, buf_rhs));
+
+    struct stat                st_lhs;
+    struct stat                st_rhs;
+    
+      // this is true only iff both path_* are 0; compare ids in this case
+    if (path_lhs==path_rhs) return strcmp(lhs, rhs);
+    if (path_lhs==0) return -1;                // path_rhs!=0 is implied by check above
+    if (path_rhs==0) return +1;
+
+    if (stat(path_lhs, &st_lhs)==-1 ||
+       stat(path_rhs, &st_rhs)==-1) return strcmp(lhs,rhs);
+
+    return (st_lhs.st_dev - st_rhs.st_dev) + (st_lhs.st_ino - st_rhs.st_ino);
+  }
+}