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Annotation of GNUtools/libg++/libio/pfstream.h, revision 1.1.1.1

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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