1 files changed, 59 insertions, 0 deletions
diff --git a/libio/pfstream.h b/libio/pfstream.h
new file mode 100644
index 00000000000..3c5458baaa9
--- /dev/null
+++ b/libio/pfstream.h
@@ -0,0 +1,59 @@
+/* This is part of libio/iostream, providing -*- C++ -*- input/output.
+Copyright (C) 1993 Free Software Foundation
+
+This file is part of the GNU IO Library.  This library 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; either version 2, or (at your option)
+any later version.
+
+This library 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 library; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+As a special exception, if you link this library with files
+compiled with a GNU compiler to produce an executable, this does not cause
+the resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why
+the executable file might be covered by the GNU General Public License. */
+
+/* Written by Per Bothner (bothner@cygnus.com). */
+
+#ifndef _PFSTREAM_H
+#define _PFSTREAM_H
+#ifdef __GNUG__
+#pragma interface
+#endif
+#include <fstream.h>
+
+extern "C++" {
+// ipfstream foo("NAME") is like: ifstream foo("NAME").  However,
+// if NAME starts *or ends* with a '|', the remainder of NAME is
+// evaluated as a shell command (using a procbuf), and all input
+// read from foo is whatever that shell writes to its standard output.
+// E.g. ipfstream foo("|zcat foo.Z") or ipfstream foo("zcat foo.Z|")
+// (These two forms are equivalent.)
+
+class ipfstream : public ifstream {
+  public:
+    ipfstream(const char *name, int mode=ios::in, int prot=0664);
+};
+
+// opfstream foo("NAME") is like: ofstream foo("NAME").
+// However, if NAME starts with a '|', the remainder of NAME is
+// evaluated as a shell command (using a procbuf), and all output
+// written to foo is piped to the standard input of that shell.
+// E.g. opfstream foo("|more");
+
+class opfstream : public ofstream {
+  public:
+    opfstream(const char *name, int mode=ios::out, int prot=0664);
+};
+} // extern "C++"
+#endif /*!_PFSTREAM_H*/
+