Clarify the --help for 'purge' (LP: #243948)

[apt.git] / apt-inst / contrib / extracttar.cc

diff --git a/apt-inst/contrib/extracttar.cc b/apt-inst/contrib/extracttar.cc
index 5d939bd80be0965537042173a71a1bce5d694890..8338fd89d2803e69b97775728a50e37eb660da67 100644 (file)
--- a/apt-inst/contrib/extracttar.cc
+++ b/apt-inst/contrib/extracttar.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: extracttar.cc,v 1.8 2003/07/18 15:35:23 mdz Exp $
+// $Id: extracttar.cc,v 1.8.2.1 2004/01/16 18:58:50 mdz Exp $
 /* ######################################################################
 
    Extract a Tar - Tar Extractor
@@ -16,10 +16,6 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/extracttar.h"
-#endif
-#include <apti18n.h>
 #include <apt-pkg/extracttar.h>
 
 #include <apt-pkg/error.h>
@@ -32,7 +28,9 @@
 #include <signal.h>
 #include <fcntl.h>
 #include <iostream>
+#include <apti18n.h>
                                                                        /*}}}*/
+
 using namespace std;
     
 // The on disk header for a tar file.
@@ -57,8 +55,8 @@ struct ExtractTar::TarHeader
 // ExtractTar::ExtractTar - Constructor                                        /*{{{*/
 // ---------------------------------------------------------------------
 /* */
-ExtractTar::ExtractTar(FileFd &Fd,unsigned long Max) : File(Fd), 
-                         MaxInSize(Max)
+ExtractTar::ExtractTar(FileFd &Fd,unsigned long Max,string DecompressionProgram) : File(Fd), 
+                         MaxInSize(Max), DecompressProg(DecompressionProgram)
 
 {
    GZPid = -1;
@@ -92,7 +90,8 @@ bool ExtractTar::Done(bool Force)
    
    // Make sure we clean it up!
    kill(GZPid,SIGINT);
-   if (ExecWait(GZPid,_config->Find("dir::bin::gzip","/bin/gzip").c_str(),
+   string confvar = string("dir::bin::") + DecompressProg;
+   if (ExecWait(GZPid,_config->Find(confvar.c_str(),DecompressProg.c_str()).c_str(),
                Force) == false)
    {
       GZPid = -1;
@@ -133,10 +132,12 @@ bool ExtractTar::StartGzip()
       SetCloseExec(STDERR_FILENO,false);
       
       const char *Args[3];
-      Args[0] = _config->Find("dir::bin::gzip","/bin/gzip").c_str();
+      string confvar = string("dir::bin::") + DecompressProg;
+      string argv0 = _config->Find(confvar.c_str(),DecompressProg.c_str());
+      Args[0] = argv0.c_str();
       Args[1] = "-d";
       Args[2] = 0;
-      execv(Args[0],(char **)Args);
+      execvp(Args[0],(char **)Args);
       cerr << _("Failed to exec gzip ") << Args[0] << endl;
       _exit(100);
    }
@@ -189,7 +190,7 @@ bool ExtractTar::Go(pkgDirStream &Stream)
         return Done(true);
       
       if (NewSum != CheckSum)
-        return _error->Error(_("Tar Checksum failed, archive corrupted"));
+        return _error->Error(_("Tar checksum failed, archive corrupted"));
    
       // Decode all of the fields
       pkgDirStream::Item Itm;
@@ -207,14 +208,14 @@ bool ExtractTar::Go(pkgDirStream &Stream)
         Itm.Name = (char *)LastLongName.c_str();
       else
       {
-        Tar->Name[sizeof(Tar->Name)] = 0;
+        Tar->Name[sizeof(Tar->Name)-1] = 0;
         Itm.Name = Tar->Name;
       }      
       if (Itm.Name[0] == '.' && Itm.Name[1] == '/' && Itm.Name[2] != 0)
         Itm.Name += 2;
       
       // Grab the link target
-      Tar->Name[sizeof(Tar->LinkName)] = 0;
+      Tar->Name[sizeof(Tar->LinkName)-1] = 0;
       Itm.LinkTarget = Tar->LinkName;
 
       if (LastLongLink.empty() == false)
@@ -306,7 +307,7 @@ bool ExtractTar::Go(pkgDirStream &Stream)
       while (Size != 0)
       {
         unsigned char Junk[32*1024];
-        unsigned long Read = MIN(Size,sizeof(Junk));
+        unsigned long Read = min(Size,(unsigned long)sizeof(Junk));
         if (InFd.Read(Junk,((Read+511)/512)*512) == false)
            return false;
         
@@ -331,7 +332,7 @@ bool ExtractTar::Go(pkgDirStream &Stream)
       }
       
       // And finish up
-      if (Itm.Size != 0 && BadRecord == false)
+      if (Itm.Size >= 0 && BadRecord == false)
         if (Stream.FinishedFile(Itm,Fd) == false)
            return false;