fa3cd24827
The cached offset is reliable to use in ftell when the stream handle is active. We can consider a stream as being active when there is unflushed data. However, even in this case, we can use the cached offset only when the stream is not being written to in a+ mode, because this case may have unflushed data and a stale offset; the previous read could have sent it off somewhere other than the end of the file. There were a couple of adjustments necessary to get this to work. Firstly, fdopen now ceases to use _IO_attach_fd because it sets the offset cache to the current file position. This is not correct because there could be changes to the file descriptor before the stream handle is activated, which would not get reflected. A similar offset caching action is done in _IO_fwide, claiming that wide streams have 'problems' with the file offsets. There don't seem to be any obvious problems with not having the offset cache available, other than that it will have to be queried in a subsequent read/write/seek. I have removed this as well. The testsuite passes successfully with these changes on x86_64.
516 lines
14 KiB
C
516 lines
14 KiB
C
/* Copyright (C) 1999-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <libioP.h>
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#ifdef _LIBC
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# include <dlfcn.h>
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# include <wchar.h>
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#endif
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#include <assert.h>
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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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# include <iconv/gconv_int.h>
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# include <shlib-compat.h>
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# include <sysdep.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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const 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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#ifdef _LIBC
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const struct __gconv_trans_data __libio_translit attribute_hidden =
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{
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.__trans_fct = __gconv_transliterate
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};
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#endif
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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 defined SHARED && defined _LIBC \
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&& SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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if (__builtin_expect (&_IO_stdin_used == NULL, 0)
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&& (fp == _IO_stdin || fp == _IO_stdout || fp == _IO_stderr))
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/* This is for a stream in the glibc 2.0 format. */
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return -1;
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#endif
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/* The orientation already has been determined. */
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if (fp->_mode != 0
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/* Or the caller simply wants to know about the current orientation. */
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|| mode == 0)
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return fp->_mode;
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/* Set the orientation appropriately. */
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if (mode > 0)
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{
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struct _IO_codecvt *cc = fp->_codecvt = &fp->_wide_data->_codecvt;
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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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/* 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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/* 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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struct gconv_fcts fcts;
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__wcsmbs_clone_conv (&fcts);
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assert (fcts.towc_nsteps == 1);
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assert (fcts.tomb_nsteps == 1);
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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 = fcts.towc_nsteps;
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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].__flags = __GCONV_IS_LAST;
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cc->__cd_in.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;
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/* XXX For now no transliteration. */
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cc->__cd_in.__cd.__data[0].__trans = NULL;
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cc->__cd_out.__cd.__nsteps = fcts.tomb_nsteps;
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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].__flags = __GCONV_IS_LAST;
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cc->__cd_out.__cd.__data[0].__statep = &fp->_wide_data->_IO_state;
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/* And now the transliteration. */
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cc->__cd_out.__cd.__data[0].__trans
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= (struct __gconv_trans_data *) &__libio_translit;
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}
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#else
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# ifdef _GLIBCPP_USE_WCHAR_T
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{
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/* Determine internal and external character sets.
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XXX For now we make our life easy: we assume a fixed internal
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encoding (as most sane systems have; hi HP/UX!). If somebody
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cares about systems which changing internal charsets they
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should come up with a solution for the determination of the
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currently used internal character set. */
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const char *internal_ccs = _G_INTERNAL_CCS;
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const char *external_ccs = NULL;
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# ifdef HAVE_NL_LANGINFO
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external_ccs = nl_langinfo (CODESET);
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# endif
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if (external_ccs == NULL)
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external_ccs = "ISO-8859-1";
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cc->__cd_in = iconv_open (internal_ccs, external_ccs);
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if (cc->__cd_in != (iconv_t) -1)
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cc->__cd_out = iconv_open (external_ccs, internal_ccs);
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if (cc->__cd_in == (iconv_t) -1 || cc->__cd_out == (iconv_t) -1)
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{
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if (cc->__cd_in != (iconv_t) -1)
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iconv_close (cc->__cd_in);
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/* XXX */
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abort ();
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}
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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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#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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return mode;
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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 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 dummy;
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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 = (unsigned char *) to_start;
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codecvt->__cd_out.__cd.__data[0].__outbufend = (unsigned char *) to_end;
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codecvt->__cd_out.__cd.__data[0].__statep = statep;
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__gconv_fct fct = gs->__fct;
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#ifdef PTR_DEMANGLE
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if (gs->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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status = DL_CALL_FCT (fct,
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(gs, codecvt->__cd_out.__cd.__data, &from_start_copy,
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(const unsigned char *) from_end, NULL,
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&dummy, 0, 0));
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*from_stop = (wchar_t *) from_start_copy;
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*to_stop = (char *) 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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# ifdef _GLIBCPP_USE_WCHAR_T
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size_t res;
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const char *from_start_copy = (const char *) from_start;
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size_t from_len = from_end - from_start;
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char *to_start_copy = to_start;
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size_t to_len = to_end - to_start;
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res = iconv (codecvt->__cd_out, &from_start_copy, &from_len,
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&to_start_copy, &to_len);
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if (res == 0 || from_len == 0)
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result = __codecvt_ok;
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else if (to_len < codecvt->__codecvt_do_max_length (codecvt))
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result = __codecvt_partial;
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else
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result = __codecvt_error;
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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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#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 dummy;
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codecvt->__cd_out.__cd.__data[0].__outbuf = (unsigned char *) to_start;
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codecvt->__cd_out.__cd.__data[0].__outbufend = (unsigned char *) to_end;
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codecvt->__cd_out.__cd.__data[0].__statep = statep;
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__gconv_fct fct = gs->__fct;
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#ifdef PTR_DEMANGLE
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if (gs->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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status = DL_CALL_FCT (fct,
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(gs, codecvt->__cd_out.__cd.__data, NULL, NULL,
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NULL, &dummy, 1, 0));
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*to_stop = (char *) 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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# ifdef _GLIBCPP_USE_WCHAR_T
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size_t res;
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char *to_start_copy = (char *) to_start;
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size_t to_len = to_end - to_start;
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res = iconv (codecvt->__cd_out, NULL, NULL, &to_start_copy, &to_len);
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if (res == 0)
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result = __codecvt_ok;
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else if (to_len < codecvt->__codecvt_do_max_length (codecvt))
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result = __codecvt_partial;
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else
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result = __codecvt_error;
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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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#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 dummy;
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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 = (unsigned char *) to_start;
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codecvt->__cd_in.__cd.__data[0].__outbufend = (unsigned char *) to_end;
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codecvt->__cd_in.__cd.__data[0].__statep = statep;
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__gconv_fct fct = gs->__fct;
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#ifdef PTR_DEMANGLE
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if (gs->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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status = DL_CALL_FCT (fct,
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(gs, codecvt->__cd_in.__cd.__data, &from_start_copy,
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(const unsigned char *) from_end, NULL,
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&dummy, 0, 0));
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*from_stop = (const char *) 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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# ifdef _GLIBCPP_USE_WCHAR_T
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size_t res;
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const char *from_start_copy = (const char *) from_start;
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size_t from_len = from_end - from_start;
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char *to_start_copy = (char *) from_start;
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size_t to_len = to_end - to_start;
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res = iconv (codecvt->__cd_in, &from_start_copy, &from_len,
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&to_start_copy, &to_len);
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if (res == 0)
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result = __codecvt_ok;
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else if (to_len == 0)
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result = __codecvt_partial;
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else if (from_len < codecvt->__codecvt_do_max_length (codecvt))
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result = __codecvt_partial;
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else
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result = __codecvt_error;
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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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#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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size_t dummy;
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codecvt->__cd_in.__cd.__data[0].__outbuf = (unsigned char *) to_buf;
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codecvt->__cd_in.__cd.__data[0].__outbufend = (unsigned char *) &to_buf[max];
|
|
codecvt->__cd_in.__cd.__data[0].__statep = statep;
|
|
|
|
__gconv_fct fct = gs->__fct;
|
|
#ifdef PTR_DEMANGLE
|
|
if (gs->__shlib_handle != NULL)
|
|
PTR_DEMANGLE (fct);
|
|
#endif
|
|
|
|
DL_CALL_FCT (fct,
|
|
(gs, codecvt->__cd_in.__cd.__data, &cp,
|
|
(const unsigned char *) from_end, NULL,
|
|
&dummy, 0, 0));
|
|
|
|
result = cp - (const unsigned char *) from_start;
|
|
#else
|
|
# ifdef _GLIBCPP_USE_WCHAR_T
|
|
const char *from_start_copy = (const char *) from_start;
|
|
size_t from_len = from_end - from_start;
|
|
wchar_t to_buf[max];
|
|
size_t res;
|
|
char *to_start = (char *) to_buf;
|
|
|
|
res = iconv (codecvt->__cd_in, &from_start_copy, &from_len,
|
|
&to_start, &max);
|
|
|
|
result = from_start_copy - (char *) from_start;
|
|
# else
|
|
/* Decide what to do. */
|
|
result = 0;
|
|
# endif
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
static int
|
|
do_max_length (struct _IO_codecvt *codecvt)
|
|
{
|
|
#ifdef _LIBC
|
|
return codecvt->__cd_in.__cd.__steps[0].__max_needed_from;
|
|
#else
|
|
return MB_CUR_MAX;
|
|
#endif
|
|
}
|