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Annotation of GNUtools/libg++/libio/pfstream.h, revision 1.1

1.1     ! root        1: /* This is part of libio/iostream, providing -*- C++ -*- input/output.
        !             2: Copyright (C) 1993 Free Software Foundation
        !             3: 
        !             4: This file is part of the GNU IO Library.  This library is free
        !             5: software; you can redistribute it and/or modify it under the
        !             6: terms of the GNU General Public License as published by the
        !             7: Free Software Foundation; either version 2, or (at your option)
        !             8: any later version.
        !             9: 
        !            10: This library is distributed in the hope that it will be useful,
        !            11: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13: GNU General Public License for more details.
        !            14: 
        !            15: You should have received a copy of the GNU General Public License
        !            16: along with GNU CC; see the file COPYING.  If not, write to
        !            17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            18: 
        !            19: As a special exception, if you link this library with files
        !            20: compiled with a GNU compiler to produce an executable, this does not cause
        !            21: the resulting executable to be covered by the GNU General Public License.
        !            22: This exception does not however invalidate any other reasons why
        !            23: the executable file might be covered by the GNU General Public License. */
        !            24: 
        !            25: /* Written by Per Bothner ([email protected]). */
        !            26: 
        !            27: #ifndef _PFSTREAM_H
        !            28: #define _PFSTREAM_H
        !            29: #ifdef __GNUG__
        !            30: #pragma interface
        !            31: #pragma cplusplus
        !            32: #endif
        !            33: #include <fstream.h>
        !            34: 
        !            35: // ipfstream foo("NAME") is like: ifstream foo("NAME").  However,
        !            36: // if NAME starts *or ends* with a '|', the remainder of NAME is
        !            37: // evaluated as a shell command (using a procbuf), and all input
        !            38: // read from foo is whatever that shell writes to its standard output.
        !            39: // E.g. ipfstream foo("|zcat foo.Z") or ipfstream foo("zcat foo.Z|")
        !            40: // (These two forms are equivalent.)
        !            41: 
        !            42: class ipfstream : public ifstream {
        !            43:   public:
        !            44:     ipfstream(const char *name, int mode=ios::in, int prot=0664);
        !            45: };
        !            46: 
        !            47: // opfstream foo("NAME") is like: ofstream foo("NAME").
        !            48: // However, if NAME starts with a '|', the remainder of NAME is
        !            49: // evaluated as a shell command (using a procbuf), and all output
        !            50: // written to foo is piped to the standard input of that shell.
        !            51: // E.g. opfstream foo("|more");
        !            52: 
        !            53: class opfstream : public ofstream {
        !            54:   public:
        !            55:     opfstream(const char *name, int mode=ios::out, int prot=0664);
        !            56: };
        !            57: #endif /*!_PFSTREAM_H*/
        !            58: 

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