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366 lines
9.9 KiB
C
366 lines
9.9 KiB
C
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/* Copyright (C) 1999 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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#include <libioP.h>
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#ifdef _LIBC
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# include <wchar.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#ifdef _LIBC
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# include <langinfo.h>
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# include <locale/localeinfo.h>
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# include <wcsmbs/wcsmbsload.h>
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#endif
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/* Prototypes of libio's codecvt functions. */
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static enum __codecvt_result do_out (struct _IO_codecvt *codecvt,
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__mbstate_t *statep,
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const wchar_t *from_start,
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const wchar_t *from_end,
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const wchar_t **from_stop, char *to_start,
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char *to_end, char **to_stop);
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static enum __codecvt_result do_unshift (struct _IO_codecvt *codecvt,
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__mbstate_t *statep, char *to_start,
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char *to_end, char **to_stop);
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static enum __codecvt_result do_in (struct _IO_codecvt *codecvt,
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__mbstate_t *statep,
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const char *from_start,
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const char *from_end,
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const char **from_stop, wchar_t *to_start,
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wchar_t *to_end, wchar_t **to_stop);
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static int do_encoding (struct _IO_codecvt *codecvt);
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static int do_length (struct _IO_codecvt *codecvt, __mbstate_t *statep,
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const char *from_start,
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const char *from_end, _IO_size_t max);
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static int do_max_length (struct _IO_codecvt *codecvt);
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static int 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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static struct _IO_codecvt 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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/* Return orientation of stream. If mode is nonzero try to change
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the orientation first. */
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#undef _IO_fwide
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int
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_IO_fwide (fp, mode)
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_IO_FILE *fp;
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int mode;
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{
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/* Normalize the value. */
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mode = mode < 0 ? -1 : (mode == 0 ? 0 : 1);
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if (mode == 0 || fp->_mode != 0)
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/* The caller simply wants to know about the current orientation
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or the orientation already has been determined. */
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return fp->_mode;
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_IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
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_IO_flockfile (fp);
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/* Set the orientation appropriately. */
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if (mode > 0)
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{
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fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
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fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base;
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/* Clear the state. We start all over again. */
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memset (&fp->_wide_data->_IO_state, '\0', sizeof (__mbstate_t));
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memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__mbstate_t));
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/* Get the character conversion functions based on the currently
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selected locale for LC_CTYPE. */
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#ifdef _LIBC
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{
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struct gconv_fcts fcts;
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struct _IO_codecvt *cc = &fp->_wide_data->_codecvt;
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__wcsmbs_clone_conv (&fcts);
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/* The functions are always the same. */
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*cc = libio_codecvt;
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cc->__cd_in.__cd.__nsteps = 1; /* Only one step allowed. */
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cc->__cd_in.__cd.__steps = fcts.towc;
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cc->__cd_in.__cd.__data[0].__invocation_counter = 0;
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cc->__cd_in.__cd.__data[0].__internal_use = 1;
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cc->__cd_in.__cd.__data[0].__is_last = 1;
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cc->__cd_in.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;
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cc->__cd_out.__cd.__nsteps = 1; /* Only one step allowed. */
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cc->__cd_out.__cd.__steps = fcts.tomb;
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cc->__cd_out.__cd.__data[0].__invocation_counter = 0;
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cc->__cd_out.__cd.__data[0].__internal_use = 1;
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cc->__cd_out.__cd.__data[0].__is_last = 1;
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cc->__cd_out.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;
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}
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#else
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# error "somehow determine this from LC_CTYPE"
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#endif
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/* From now on use the wide character callback functions. */
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((struct _IO_FILE_plus *) fp)->vtable = fp->_wide_data->_wide_vtable;
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}
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/* Set the mode now. */
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fp->_mode = mode;
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_IO_funlockfile (fp);
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_IO_cleanup_region_end (0);
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return mode;
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}
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#ifdef weak_alias
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weak_alias (_IO_fwide, fwide)
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#endif
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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 result;
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#ifdef _LIBC
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struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps;
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int status;
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size_t written;
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const unsigned char *from_start_copy = (unsigned char *) from_start;
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codecvt->__cd_out.__cd.__data[0].__outbuf = to_start;
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codecvt->__cd_out.__cd.__data[0].__outbufend = to_end;
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codecvt->__cd_out.__cd.__data[0].__statep = statep;
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status = (*gs->__fct) (gs, codecvt->__cd_out.__cd.__data, &from_start_copy,
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(const unsigned char *) from_end, &written, 0);
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*from_stop = (wchar_t *) from_start_copy;
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*to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf;
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switch (status)
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{
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case __GCONV_OK:
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case __GCONV_EMPTY_INPUT:
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result = __codecvt_ok;
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break;
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case __GCONV_FULL_OUTPUT:
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case __GCONV_INCOMPLETE_INPUT:
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result = __codecvt_partial;
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break;
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default:
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result = __codecvt_error;
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break;
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}
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#else
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/* Decide what to do. */
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result = __codecvt_error;
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#endif
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return result;
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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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enum __codecvt_result result;
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#ifdef _LIBC
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struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps;
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int status;
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size_t written;
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codecvt->__cd_out.__cd.__data[0].__outbuf = to_start;
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codecvt->__cd_out.__cd.__data[0].__outbufend = to_end;
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codecvt->__cd_out.__cd.__data[0].__statep = statep;
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status = (*gs->__fct) (gs, codecvt->__cd_out.__cd.__data, NULL, NULL,
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&written, 1);
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*to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf;
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switch (status)
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{
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case __GCONV_OK:
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case __GCONV_EMPTY_INPUT:
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result = __codecvt_ok;
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break;
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case __GCONV_FULL_OUTPUT:
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case __GCONV_INCOMPLETE_INPUT:
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result = __codecvt_partial;
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break;
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default:
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result = __codecvt_error;
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break;
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}
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#else
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/* Decide what to do. */
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result = __codecvt_error;
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#endif
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return result;
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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 result;
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#ifdef _LIBC
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struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps;
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int status;
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size_t written;
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const unsigned char *from_start_copy = (unsigned char *) from_start;
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codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_start;
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codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) to_end;
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codecvt->__cd_in.__cd.__data[0].__statep = statep;
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status = (*gs->__fct) (gs, codecvt->__cd_in.__cd.__data, &from_start_copy,
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from_end, &written, 0);
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*from_stop = from_start_copy;
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*to_stop = (wchar_t *) codecvt->__cd_in.__cd.__data[0].__outbuf;
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switch (status)
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{
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case __GCONV_OK:
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case __GCONV_EMPTY_INPUT:
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result = __codecvt_ok;
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break;
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case __GCONV_FULL_OUTPUT:
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case __GCONV_INCOMPLETE_INPUT:
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result = __codecvt_partial;
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break;
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default:
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result = __codecvt_error;
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break;
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}
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#else
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/* Decide what to do. */
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result = __codecvt_error;
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#endif
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return result;
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}
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static int
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do_encoding (struct _IO_codecvt *codecvt)
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{
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#ifdef _LIBC
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/* See whether the encoding is stateful. */
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if (codecvt->__cd_in.__cd.__steps[0].__stateful)
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return -1;
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/* Fortunately not. Now determine the input bytes for the conversion
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necessary for each wide character. */
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if (codecvt->__cd_in.__cd.__steps[0].__min_needed_from
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!= codecvt->__cd_in.__cd.__steps[0].__max_needed_from)
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/* Not a constant value. */
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return 0;
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return codecvt->__cd_in.__cd.__steps[0].__min_needed_from;
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#else
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/* Worst case scenario. */
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return -1;
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#endif
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}
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static int
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do_always_noconv (struct _IO_codecvt *codecvt)
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{
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return 0;
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}
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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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{
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int result;
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#ifdef _LIBC
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const unsigned char *cp = (const unsigned char *) from_start;
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wchar_t to_buf[max];
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struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps;
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int status;
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size_t written;
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codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_buf;
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codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) &to_buf[max];
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codecvt->__cd_in.__cd.__data[0].__statep = statep;
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status = (*gs->__fct) (gs, codecvt->__cd_in.__cd.__data, &cp, from_end,
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&written, 0);
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result = cp - (const unsigned char *) from_start;
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#else
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/* Decide what to do. */
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result = 0;
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#endif
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return result;
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}
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static int
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do_max_length (struct _IO_codecvt *codecvt)
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{
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#ifdef _LIBC
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return codecvt->__cd_in.__cd.__steps[0].__max_needed_from;
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#else
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return MB_CUR_MAX;
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#endif
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}
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