Bug fixes

Author: jgg
Date: 1999-09-30 06:30:34 GMT
Bug fixes

2 files changed, 42 insertions, 2 deletions

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index a2c6ab370..ddb07532d 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description								/*{{{*/
-// $Id: fileutl.cc,v 1.30 1999/07/26 17:46:08 jgg Exp $
+// $Id: fileutl.cc,v 1.31 1999/09/30 06:30:34 jgg Exp $
 /* ######################################################################
    
    File Utilities
@@ -150,6 +150,45 @@ string flNotFile(string File)
    return string(File,0,Res);
 }
 									/*}}}*/
+// flNoLink - If file is a symlink then deref it			/*{{{*/
+// ---------------------------------------------------------------------
+/* If the name is not a link then the returned path is the input. */
+string flNoLink(string File)
+{
+   struct stat St;
+   if (lstat(File.c_str(),&St) != 0 || S_ISLNK(St.st_mode) == 0)
+      return File;
+   if (stat(File.c_str(),&St) != 0)
+      return File;
+   
+   /* Loop resolving the link. There is no need to limit the number of 
+      loops because the stat call above ensures that the symlink is not 
+      circular */
+   char Buffer[1024];
+   string NFile = File;
+   while (1)
+   {
+      // Read the link
+      int Res;
+      if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 || 
+	  (unsigned)Res >= sizeof(Buffer))
+	  return File;
+      
+      // Append or replace the previous path
+      Buffer[Res] = 0;
+      if (Buffer[0] == '/')
+	 NFile = Buffer;
+      else
+	 NFile = flNotFile(NFile) + Buffer;
+      
+      // See if we are done
+      if (lstat(NFile.c_str(),&St) != 0)
+	 return File;
+      if (S_ISLNK(St.st_mode) == 0)
+	 return NFile;      
+   }   
+}
+									/*}}}*/
 // SetCloseExec - Set the close on exec flag				/*{{{*/
 // ---------------------------------------------------------------------
 /* */
diff --git a/apt-pkg/contrib/fileutl.h b/apt-pkg/contrib/fileutl.h
index fe904acf5..7ad630ce3 100644
--- a/apt-pkg/contrib/fileutl.h
+++ b/apt-pkg/contrib/fileutl.h
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description								/*{{{*/
-// $Id: fileutl.h,v 1.21 1999/07/26 17:46:08 jgg Exp $
+// $Id: fileutl.h,v 1.22 1999/09/30 06:30:34 jgg Exp $
 /* ######################################################################
    
    File Utilities
@@ -83,5 +83,6 @@ bool ExecWait(int Pid,const char *Name,bool Reap = false);
 // File string manipulators
 string flNotDir(string File);
 string flNotFile(string File);
+string flNoLink(string File);
 
 #endif