X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/0a8e3465cb644e380ab0fc6d66f6d1f17363b34e..6d5dd02a49b18017c296c2d76bc6bb1d9f1ef6ac:/apt-pkg/contrib/fileutl.cc

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 60b9f8b75..a761794ee 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 1.8 1998/10/02 04:39:50 jgg Exp $
+// $Id: fileutl.cc,v 1.22 1999/03/15 08:10:39 jgg Exp $
 /* ######################################################################
    
    File Utilities
@@ -24,12 +24,14 @@
 #include <sys/stat.h>
 #include <sys/fcntl.h>
 #include <sys/types.h>
+#include <sys/time.h>
+#include <errno.h>
 									/*}}}*/
 
 // CopyFile - Buffered copy of a file					/*{{{*/
 // ---------------------------------------------------------------------
 /* The caller is expected to set things so that failure causes erasure */
-bool CopyFile(FileFd From,FileFd To)
+bool CopyFile(FileFd &From,FileFd &To)
 {
    if (From.IsOpen() == false || To.IsOpen() == false)
       return false;
@@ -68,10 +70,10 @@ int GetLock(string File,bool Errors)
    
    // Aquire a write lock
    struct flock fl;
-   fl.l_type= F_WRLCK;
-   fl.l_whence= SEEK_SET;
-   fl.l_start= 0;
-   fl.l_len= 1;
+   fl.l_type = F_WRLCK;
+   fl.l_whence = SEEK_SET;
+   fl.l_start = 0;
+   fl.l_len = 0;
    if (fcntl(FD,F_SETLK,&fl) == -1)
    {
       if (Errors == true)
@@ -102,8 +104,11 @@ string SafeGetCWD()
    // Stash the current dir.
    char S[300];
    S[0] = 0;
-   if (getcwd(S,sizeof(S)) == 0)
+   if (getcwd(S,sizeof(S)-2) == 0)
       return "/";
+   unsigned int Len = strlen(S);
+   S[Len] = '/';
+   S[Len+1] = 0;
    return S;
 }
 									/*}}}*/
@@ -119,6 +124,70 @@ string flNotDir(string File)
    return string(File,Res,Res - File.length());
 }
 									/*}}}*/
+// flNotFile - Strip the file from the directory name			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string flNotFile(string File)
+{
+   string::size_type Res = File.rfind('/');
+   if (Res == string::npos)
+      return File;
+   Res++;
+   return string(File,0,Res);
+}
+									/*}}}*/
+// SetCloseExec - Set the close on exec flag				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void SetCloseExec(int Fd,bool Close)
+{   
+   if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0)
+   {
+      cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl;
+      exit(100);
+   }
+}
+									/*}}}*/
+// SetNonBlock - Set the nonblocking flag				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void SetNonBlock(int Fd,bool Block)
+{   
+   int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK);
+   if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0)
+   {
+      cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl;
+      exit(100);
+   }
+}
+									/*}}}*/
+// WaitFd - Wait for a FD to become readable				/*{{{*/
+// ---------------------------------------------------------------------
+/* This waits for a FD to become readable using select. It is usefull for
+   applications making use of non-blocking sockets. The timeout is 
+   in seconds. */
+bool WaitFd(int Fd,bool write,unsigned long timeout)
+{
+   fd_set Set;
+   struct timeval tv;
+   FD_ZERO(&Set);
+   FD_SET(Fd,&Set);
+   tv.tv_sec = timeout;
+   tv.tv_usec = 0;
+   if (write == true) 
+   {
+      if (select(Fd+1,0,&Set,0,(timeout != 0?&tv:0)) <= 0)
+         return false;
+   } 
+   else 
+   {
+      if (select(Fd+1,&Set,0,0,(timeout != 0?&tv:0)) <= 0)
+         return false;
+   }
+   
+   return true;
+}
+									/*}}}*/
 
 // FileFd::FileFd - Open a file						/*{{{*/
 // ---------------------------------------------------------------------
@@ -133,9 +202,13 @@ FileFd::FileFd(string FileName,OpenMode Mode, unsigned long Perms)
       break;
       
       case WriteEmpty:
-      unlink(FileName.c_str());
-      iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_EXCL,Perms);
-      break;
+      {
+	 struct stat Buf;
+	 if (stat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
+	    unlink(FileName.c_str());
+	 iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_TRUNC,Perms);
+	 break;
+      }
       
       case WriteExists:
       iFd = open(FileName.c_str(),O_RDWR);
@@ -143,18 +216,16 @@ FileFd::FileFd(string FileName,OpenMode Mode, unsigned long Perms)
 
       case WriteAny:
       iFd = open(FileName.c_str(),O_RDWR | O_CREAT,Perms);
-      break;
-      
-      // Dont use this in public directories
-      case LockEmpty:
-      iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_TRUNC,Perms);
-      break;
+      break;      
    }  
 
    if (iFd < 0)
       _error->Errno("open","Could not open file %s",FileName.c_str());
    else
+   {
       this->FileName = FileName;
+      SetCloseExec(iFd,true);
+   }   
 }
 									/*}}}*/
 // FileFd::~File - Closes the file					/*{{{*/
@@ -183,7 +254,7 @@ bool FileFd::Read(void *To,unsigned long Size)
 // FileFd::Write - Write to the file					/*{{{*/
 // ---------------------------------------------------------------------
 /* */
-bool FileFd::Write(void *From,unsigned long Size)
+bool FileFd::Write(const void *From,unsigned long Size)
 {
    if (write(iFd,From,Size) != (signed)Size)
    {
@@ -208,6 +279,31 @@ bool FileFd::Seek(unsigned long To)
    return true;
 }
 									/*}}}*/
+// FileFd::Truncate - Truncate the file 				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Truncate(unsigned long To)
+{
+   if (ftruncate(iFd,To) != 0)
+   {
+      Flags |= Fail;
+      return _error->Error("Unable to truncate to %u",To);
+   }
+   
+   return true;
+}
+									/*}}}*/
+// FileFd::Tell - Current seek position					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long FileFd::Tell()
+{
+   off_t Res = lseek(iFd,0,SEEK_CUR);
+   if (Res == (off_t)-1)
+      _error->Errno("lseek","Failed to determine the current file position");
+   return Res;
+}
+									/*}}}*/
 // FileFd::Size - Return the size of the file				/*{{{*/
 // ---------------------------------------------------------------------
 /* */