c_io_libio.h: Tweak.
2000-08-08 Benjamin Kosnik <bkoz@cygnus.com> Ulrich Drepper <drepper@cygnus.com> * config/c_io_libio.h: Tweak. * config/c_io_libio_codecvt.c: New file. * libio/Makefile.am: Add c_codecvt.c. * libio/Makefile.in: Regenerate. * libio/genops.c (_IO_unbuffer_write): Don't call _IO_SETBUF if the stream is not orientated. * acinclude.m4: Add config/c_io_libio_codecvt.c dummy file, until encoding gets fleshed out. * bits/basic_file.h: Add specialization declarations. * config/c_io_libio.cc: Add specializations for pbackfail, uflow. * config/c_io_libio.h: Add __c_wfile_type. * bits/basic_file.h: Add _M_wfile. * config/c_io_libio.cc (__basic_file<char>): Initialize the streams without setting the orientation of the underlying FILE to either wide or narrow. (__basic_file<wchar_t>)): Enable tricky wchar_t io bits. From-SVN: r35583
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Benjamin Kosnik
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150
libstdc++-v3/config/c_io_libio_codecvt.c
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libstdc++-v3/config/c_io_libio_codecvt.c
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/* Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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 this library; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, 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
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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/* Slightly modified from glibc/libio/iofwide.c */
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#include <libio.h>
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/* Prototypes of libio's codecvt functions. */
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static enum __codecvt_result
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do_out(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const wchar_t *from_start, const wchar_t *from_end,
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const wchar_t **from_stop, char *to_start, char *to_end,
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char **to_stop);
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static enum __codecvt_result
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do_unshift(struct _IO_codecvt *codecvt, __mbstate_t *statep, char *to_start,
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char *to_end, char **to_stop);
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static enum __codecvt_result
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do_in(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const char *from_start, const char *from_end, const char **from_stop,
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wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop);
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static int
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do_encoding(struct _IO_codecvt *codecvt);
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static int
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do_length(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const char *from_start, const char *from_end, _IO_size_t max);
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static int
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do_max_length(struct _IO_codecvt *codecvt);
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static int
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do_always_noconv(struct _IO_codecvt *codecvt);
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/* The functions used in `codecvt' for libio are always the same. */
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struct _IO_codecvt __c_libio_codecvt =
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{
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.__codecvt_destr = NULL, /* Destructor, never used. */
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.__codecvt_do_out = do_out,
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.__codecvt_do_unshift = do_unshift,
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.__codecvt_do_in = do_in,
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.__codecvt_do_encoding = do_encoding,
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.__codecvt_do_always_noconv = do_always_noconv,
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.__codecvt_do_length = do_length,
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.__codecvt_do_max_length = do_max_length
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};
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static enum __codecvt_result
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do_out(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const wchar_t *from_start, const wchar_t *from_end,
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const wchar_t **from_stop, char *to_start, char *to_end,
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char **to_stop)
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{
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enum __codecvt_result res = __codecvt_ok;
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while (from_start < from_end)
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{
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if (to_start >= to_end)
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{
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res = __codecvt_partial;
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break;
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}
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*to_start++ = (char) *from_start++;
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}
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*from_stop = from_start;
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*to_stop = to_start;
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return res;
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}
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static enum __codecvt_result
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do_unshift(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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char *to_start, char *to_end, char **to_stop)
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{
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*to_stop = to_start;
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return __codecvt_ok;
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}
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static enum __codecvt_result
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do_in(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const char *from_start, const char *from_end, const char **from_stop,
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wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop)
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{
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enum __codecvt_result res = __codecvt_ok;
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while (from_start < from_end)
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{
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if (to_start >= to_end)
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{
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res = __codecvt_partial;
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break;
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}
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*to_start++ = (wchar_t) *from_start++;
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}
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*from_stop = from_start;
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*to_stop = to_start;
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return res;
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}
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static int
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do_encoding(struct _IO_codecvt *codecvt)
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{ return 1; }
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static int
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do_always_noconv(struct _IO_codecvt *codecvt)
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{ return 0; }
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static int
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do_length(struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const char *from_start, const char *from_end, _IO_size_t max)
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{ return from_end - from_start; }
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static int
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do_max_length(struct _IO_codecvt *codecvt)
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{ return 1; }
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