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Annotation of GNUtools/libg++/libio/indstream.cc, 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: #ifdef __GNUG__
                     28: #pragma implementation
                     29: #endif
                     30: 
                     31: #include <indstream.h>
                     32: 
                     33: indirectbuf::indirectbuf(streambuf *get, streambuf *put, int delete_mode)
                     34: : streambuf()
                     35: {
                     36:     _get_stream = get;
                     37:     _put_stream = put == NULL ? get : put;
                     38:     _delete_flags = delete_mode;
                     39: }
                     40: 
                     41: indirectbuf::~indirectbuf()
                     42: {
                     43:     if (_delete_flags & ios::in)  delete get_stream();
                     44:     if (_delete_flags & ios::out)  delete put_stream();
                     45: }
                     46: 
                     47: int indirectbuf::xsputn(const char* s, int n)
                     48: {
                     49:     return put_stream()->sputn(s, n);
                     50: }
                     51: 
                     52: int indirectbuf::xsgetn(char* s, int n)
                     53: {
                     54:     return get_stream()->sgetn(s, n);
                     55: }
                     56: 
                     57: int indirectbuf::overflow(int c /* = EOF */)
                     58: {
                     59:     if (c == EOF)
                     60:        return put_stream()->overflow(c);
                     61:     else
                     62:        return put_stream()->sputc(c);
                     63: }
                     64: 
                     65: int indirectbuf::underflow()
                     66: {
                     67:     return get_stream()->sbumpc();
                     68: }
                     69: 
                     70: streampos indirectbuf::seekoff(streamoff off, _seek_dir dir, int mode)
                     71: {
                     72:     int ret_val = 0;
                     73:     int select = mode == 0 ? (ios::in|ios::out) : mode;
                     74:     streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
                     75:     streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
                     76:     if (gbuf == pbuf)
                     77:        ret_val = gbuf->seekoff(off, dir, mode);
                     78:     else {
                     79:        if (gbuf)
                     80:            ret_val = gbuf->seekoff(off, dir, ios::in);
                     81:        if (pbuf && ret_val != EOF)
                     82:            ret_val = pbuf->seekoff(off, dir, ios::out);
                     83:     }
                     84:     return ret_val;
                     85: }
                     86: 
                     87: streampos indirectbuf::seekpos(streampos pos, int mode)
                     88: {
                     89:     int ret_val = EOF;
                     90:     int select = mode == 0 ? (ios::in|ios::out) : mode;
                     91:     streambuf *gbuf = (select & ios::in) ? get_stream() : NULL;
                     92:     streambuf *pbuf = (select & ios::out) ? put_stream() : NULL;
                     93:     if (gbuf == pbuf)
                     94:        ret_val = gbuf->seekpos(pos, mode);
                     95:     else {
                     96:        if (gbuf)
                     97:            ret_val = gbuf->seekpos(pos, ios::in);
                     98:        if (pbuf && ret_val != EOF)
                     99:            ret_val = pbuf->seekpos(pos, ios::out);
                    100:     }
                    101:     return ret_val;
                    102: }
                    103: 
                    104: int indirectbuf::sync()
                    105: {
                    106:   streambuf *gbuf = get_stream();
                    107:   int get_ret_val = gbuf ? gbuf->sync() : 0;
                    108:   streambuf *pbuf = put_stream();
                    109:   int put_ret_val = (pbuf && pbuf != gbuf) ?  pbuf->sync() : 0;
                    110:   return get_ret_val || put_ret_val;
                    111: }
                    112: 
                    113: int indirectbuf::pbackfail(int c)
                    114: {
                    115:     return get_stream()->sputbackc(c);
                    116: }

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