61d5ffaf10
issues in these areas:
.h's installed
.hP's installed
-lcurses interaction
files needed in ~/legal for copyleft reasons.
144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
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Copyright (C) 1993 Free Software Foundation
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This file is part of the GNU IO Library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* Written by Per Bothner (bothner@cygnus.com). */
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#include "libioP.h"
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#include "streambuf.h"
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#include <stdio.h>
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// The ANSI draft requires that operations on cin/cout/cerr can be
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// mixed with operations on stdin/stdout/stderr on a character by
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// character basis. This normally requires that the streambuf's
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// used by cin/cout/cerr be stdiostreams. However, if the stdio
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// implementation is the one that is built using this library,
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// then we don't need to, since in that case stdin/stdout/stderr
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// are identical to _IO_stdin/_IO_stdout/_IO_stderr.
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#include "libio.h"
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#ifdef _STDIO_USES_IOSTREAM
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#define CIN_SBUF _IO_stdin_
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#define COUT_SBUF _IO_stdout_
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#define CERR_SBUF _IO_stderr_
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static int use_stdiobuf = 0;
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#else
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#define CIN_SBUF _IO_stdin_buf
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#define COUT_SBUF _IO_stdout_buf
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#define CERR_SBUF _IO_stderr_buf
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static int use_stdiobuf = 1;
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#endif
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#define cin CIN
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#define cout COUT
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#define cerr CERR
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#define clog CLOG
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#include "iostream.h"
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#undef cin
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#undef cout
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#undef cerr
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#undef clog
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#ifdef __GNUG__
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#define PAD 0 /* g++ allows 0-length arrays. */
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#else
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#define PAD 1
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#endif
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struct _fake_istream {
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struct myfields {
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#ifdef __GNUC__
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_ios_fields *vb; /* pointer to virtual base class ios */
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_IO_ssize_t _gcount;
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#else
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/* This is supposedly correct for cfront. */
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_IO_ssize_t _gcount;
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void *vptr;
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_ios_fields *vb; /* pointer to virtual base class ios */
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#endif
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} mine;
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_ios_fields base;
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char filler[sizeof(struct istream)-sizeof(struct _ios_fields)+PAD];
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};
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struct _fake_ostream {
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struct myfields {
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#ifndef __GNUC__
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void *vptr;
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#endif
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_ios_fields *vb; /* pointer to virtual base class ios */
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} mine;
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_ios_fields base;
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char filler[sizeof(struct ostream)-sizeof(struct _ios_fields)+PAD];
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};
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#define STD_STR(SBUF, TIE, EXTRA_FLAGS) \
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(streambuf*)&SBUF, TIE, 0, ios::dont_close|ios::skipws|EXTRA_FLAGS, ' ',0,0,6
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#ifdef __GNUC__
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#define OSTREAM_DEF(NAME, SBUF, TIE, EXTRA_FLAGS) \
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_fake_ostream NAME = { {&NAME.base}, {STD_STR(SBUF, TIE, EXTRA_FLAGS) }};
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#define ISTREAM_DEF(NAME, SBUF, TIE, EXTRA_FLAGS) \
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_fake_istream NAME = { {&NAME.base}, {STD_STR(SBUF, TIE, EXTRA_FLAGS) }};
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#else
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#define OSTREAM_DEF(NAME, SBUF, TIE, EXTRA_FLAGS) \
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_fake_ostream NAME = { {0, &NAME.base}, {STD_STR(SBUF, TIE, EXTRA_FLAGS) }};
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#define ISTREAM_DEF(NAME, SBUF, TIE, EXTRA_FLAGS) \
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_fake_istream NAME = {{0, 0, &NAME.base}, {STD_STR(SBUF, TIE, EXTRA_FLAGS)}};
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#endif
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OSTREAM_DEF(cout, COUT_SBUF, NULL, 0)
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OSTREAM_DEF(cerr, CERR_SBUF,(ostream*)&cout, ios::unitbuf)
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ISTREAM_DEF(cin, CIN_SBUF, (ostream*)&cout, 0)
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/* Only for (partial) compatibility with AT&T's library. */
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OSTREAM_DEF(clog, CERR_SBUF, (ostream*)&cout, 0)
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// Switches between using _IO_std{in,out,err} and __std{in,out,err}_buf
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// for standard streams. This does not normally need to be called
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// explicitly, but is provided for AT&T compatibility.
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int ios::sync_with_stdio(int new_state)
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{
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#ifdef _STDIO_USES_IOSTREAM
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// It is always synced.
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return 0;
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#else
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if (new_state == use_stdiobuf) // The usual case now.
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return use_stdiobuf;
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if (new_state) {
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cin.base._strbuf = (streambuf*)&_IO_stdin_buf;
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cout.base._strbuf = (streambuf*)&_IO_stdout_buf;
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cerr.base._strbuf = (streambuf*)&_IO_stderr_buf;
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clog.base._strbuf = (streambuf*)&_IO_stderr_buf;
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} else {
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cin.base._strbuf = (streambuf*)_IO_stdin;
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cout.base._strbuf = (streambuf*)_IO_stdout;
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cerr.base._strbuf = (streambuf*)_IO_stderr;
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clog.base._strbuf = (streambuf*)_IO_stderr;
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}
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int old_state = use_stdiobuf;
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use_stdiobuf = new_state;
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return old_state;
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#endif
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}
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