diff options
Diffstat (limited to 'contrib/libstdc++/libio/iofwide.c')
-rw-r--r-- | contrib/libstdc++/libio/iofwide.c | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/contrib/libstdc++/libio/iofwide.c b/contrib/libstdc++/libio/iofwide.c new file mode 100644 index 0000000..76a20ce --- /dev/null +++ b/contrib/libstdc++/libio/iofwide.c @@ -0,0 +1,476 @@ +/* Copyright (C) 1999, 2000 Free Software Foundation, Inc. + This file is part of the GNU IO Library. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This library is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this library; see the file COPYING. If not, write to + the Free Software Foundation, 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA. + + As a special exception, if you link this library with files + compiled with a GNU compiler to produce an executable, this does + not cause the resulting executable to be covered by the GNU General + Public License. This exception does not however invalidate any + other reasons why the executable file might be covered by the GNU + General Public License. */ + +#include <libioP.h> +#ifdef _LIBC +# include <dlfcn.h> +# include <wchar.h> +# include <locale/localeinfo.h> +# include <wcsmbs/wcsmbsload.h> +# include <iconv/gconv_int.h> +#endif +#include <stdlib.h> +#include <string.h> + +#if defined(_LIBC) || defined(_GLIBCPP_USE_WCHAR_T) +# include <langinfo.h> +#endif + +#ifdef _GLIBCPP_USE_WCHAR_T +/* Prototypes of libio's codecvt functions. */ +static enum __codecvt_result do_out (struct _IO_codecvt *codecvt, + __c_mbstate_t *statep, + const wchar_t *from_start, + const wchar_t *from_end, + const wchar_t **from_stop, char *to_start, + char *to_end, char **to_stop); +static enum __codecvt_result do_unshift (struct _IO_codecvt *codecvt, + __c_mbstate_t *statep, char *to_start, + char *to_end, char **to_stop); +static enum __codecvt_result do_in (struct _IO_codecvt *codecvt, + __c_mbstate_t *statep, + const char *from_start, + const char *from_end, + const char **from_stop, wchar_t *to_start, + wchar_t *to_end, wchar_t **to_stop); +static int do_encoding (struct _IO_codecvt *codecvt); +static int do_length (struct _IO_codecvt *codecvt, __c_mbstate_t *statep, + const char *from_start, + const char *from_end, _IO_size_t max); +static int do_max_length (struct _IO_codecvt *codecvt); +static int do_always_noconv (struct _IO_codecvt *codecvt); + + +/* The functions used in `codecvt' for libio are always the same. */ +struct _IO_codecvt __libio_codecvt = +{ + .__codecvt_destr = NULL, /* Destructor, never used. */ + .__codecvt_do_out = do_out, + .__codecvt_do_unshift = do_unshift, + .__codecvt_do_in = do_in, + .__codecvt_do_encoding = do_encoding, + .__codecvt_do_always_noconv = do_always_noconv, + .__codecvt_do_length = do_length, + .__codecvt_do_max_length = do_max_length +}; + + +#ifdef _LIBC +static struct __gconv_trans_data libio_translit = +{ + .__trans_fct = __gconv_transliterate +}; +#endif +#endif /* defined(GLIBCPP_USE_WCHAR_T) */ + +/* Return orientation of stream. If mode is nonzero try to change + the orientation first. */ +#undef _IO_fwide +int +_IO_fwide (fp, mode) + _IO_FILE *fp; + int mode; +{ + /* Normalize the value. */ + mode = mode < 0 ? -1 : (mode == 0 ? 0 : 1); + + if (mode == 0 || fp->_mode != 0) + /* The caller simply wants to know about the current orientation + or the orientation already has been determined. */ + return fp->_mode; + + /* Set the orientation appropriately. */ + if (mode > 0) + { +#ifdef _GLIBCPP_USE_WCHAR_T + struct _IO_codecvt *cc = fp->_codecvt; + + fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; + fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base; + +#ifdef _LIBC + /* Get the character conversion functions based on the currently + selected locale for LC_CTYPE. */ + { + struct gconv_fcts fcts; + + /* Clear the state. We start all over again. */ + memset (&fp->_wide_data->_IO_state, '\0', sizeof (__c_mbstate_t)); + memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__c_mbstate_t)); + + __wcsmbs_clone_conv (&fcts); + + /* The functions are always the same. */ + *cc = __libio_codecvt; + + cc->__cd_in.__cd.__nsteps = 1; /* Only one step allowed. */ + cc->__cd_in.__cd.__steps = fcts.towc; + + cc->__cd_in.__cd.__data[0].__invocation_counter = 0; + cc->__cd_in.__cd.__data[0].__internal_use = 1; + cc->__cd_in.__cd.__data[0].__flags = __GCONV_IS_LAST; + cc->__cd_in.__cd.__data[0].__statep = &fp->_wide_data->_IO_state; + + /* XXX For now no transliteration. */ + cc->__cd_in.__cd.__data[0].__trans = NULL; + + cc->__cd_out.__cd.__nsteps = 1; /* Only one step allowed. */ + cc->__cd_out.__cd.__steps = fcts.tomb; + + cc->__cd_out.__cd.__data[0].__invocation_counter = 0; + cc->__cd_out.__cd.__data[0].__internal_use = 1; + cc->__cd_out.__cd.__data[0].__flags = __GCONV_IS_LAST; + cc->__cd_out.__cd.__data[0].__statep = &fp->_wide_data->_IO_state; + + /* And now the transliteration. */ + cc->__cd_out.__cd.__data[0].__trans = &libio_translit; + } +#else +# ifdef _GLIBCPP_USE_WCHAR_T + { + /* Determine internal and external character sets. + XXX For now we make our life easy: we assume a fixed internal + encoding (as most sane systems have; hi HP/UX!). If somebody + cares about systems which changing internal charsets they + should come up with a solution for the determination of the + currently used internal character set. */ +#if 0 + const char *internal_ccs = _G_INTERNAL_CCS; + const char *external_ccs = nl_langinfo(CODESET); + + if (external_ccs == NULL) + external_ccs = "ISO-8859-1"; + + cc->__cd_in = iconv_open (internal_ccs, external_ccs); + if (cc->__cd_in != (iconv_t) -1) + cc->__cd_out = iconv_open (external_ccs, internal_ccs); +#endif + } +# else +# error "somehow determine this from LC_CTYPE" +# endif +#endif + + /* From now on use the wide character callback functions. */ + ((struct _IO_FILE_plus *) fp)->vtable = fp->_wide_data->_wide_vtable; +#else /* !defined(_GLIBCPP_USE_WCHAR_T) */ + mode = fp->_mode; +#endif /* !defined(_GLIBCPP_USE_WCHAR_T) */ + } + + /* Set the mode now. */ + fp->_mode = mode; + + return mode; +} + +#ifdef weak_alias +weak_alias (_IO_fwide, fwide) +#endif + +#ifdef _GLIBCPP_USE_WCHAR_T + +static enum __codecvt_result +do_out (struct _IO_codecvt *codecvt, __c_mbstate_t *statep, + const wchar_t *from_start, const wchar_t *from_end, + const wchar_t **from_stop, char *to_start, char *to_end, + char **to_stop) +{ + enum __codecvt_result result; + +#ifdef _LIBC + struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps; + int status; + size_t dummy; + const unsigned char *from_start_copy = (unsigned char *) from_start; + + codecvt->__cd_out.__cd.__data[0].__outbuf = to_start; + codecvt->__cd_out.__cd.__data[0].__outbufend = to_end; + codecvt->__cd_out.__cd.__data[0].__statep = statep; + + status = DL_CALL_FCT (gs->__fct, + (gs, codecvt->__cd_out.__cd.__data, &from_start_copy, + (const unsigned char *) from_end, NULL, + &dummy, 0, 0)); + + *from_stop = (wchar_t *) from_start_copy; + *to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf; + + switch (status) + { + case __GCONV_OK: + case __GCONV_EMPTY_INPUT: + result = __codecvt_ok; + break; + + case __GCONV_FULL_OUTPUT: + case __GCONV_INCOMPLETE_INPUT: + result = __codecvt_partial; + break; + + default: + result = __codecvt_error; + break; + } +#else +# ifdef _GLIBCPP_USE_WCHAR_T + size_t res; + const char *from_start_copy = (const char *) from_start; + size_t from_len = from_end - from_start; + char *to_start_copy = to_start; + size_t to_len = to_end - to_start; + res = iconv (codecvt->__cd_out, &from_start_copy, &from_len, + &to_start_copy, &to_len); + + if (res == 0 || from_len == 0) + result = __codecvt_ok; + else if (to_len < codecvt->__codecvt_do_max_length (codecvt)) + result = __codecvt_partial; + else + result = __codecvt_error; + +# else + /* Decide what to do. */ + result = __codecvt_error; +# endif +#endif + + return result; +} + + +static enum __codecvt_result +do_unshift (struct _IO_codecvt *codecvt, __c_mbstate_t *statep, + char *to_start, char *to_end, char **to_stop) +{ + enum __codecvt_result result; + +#ifdef _LIBC + struct __gconv_step *gs = codecvt->__cd_out.__cd.__steps; + int status; + size_t dummy; + + codecvt->__cd_out.__cd.__data[0].__outbuf = to_start; + codecvt->__cd_out.__cd.__data[0].__outbufend = to_end; + codecvt->__cd_out.__cd.__data[0].__statep = statep; + + status = DL_CALL_FCT (gs->__fct, + (gs, codecvt->__cd_out.__cd.__data, NULL, NULL, + NULL, &dummy, 1, 0)); + + *to_stop = codecvt->__cd_out.__cd.__data[0].__outbuf; + + switch (status) + { + case __GCONV_OK: + case __GCONV_EMPTY_INPUT: + result = __codecvt_ok; + break; + + case __GCONV_FULL_OUTPUT: + case __GCONV_INCOMPLETE_INPUT: + result = __codecvt_partial; + break; + + default: + result = __codecvt_error; + break; + } +#else +# ifdef _GLIBCPP_USE_WCHAR_T + size_t res; + char *to_start_copy = (char *) to_start; + size_t to_len = to_end - to_start; + + res = iconv (codecvt->__cd_out, NULL, NULL, &to_start_copy, &to_len); + + if (res == 0) + result = __codecvt_ok; + else if (to_len < codecvt->__codecvt_do_max_length (codecvt)) + result = __codecvt_partial; + else + result = __codecvt_error; +# else + /* Decide what to do. */ + result = __codecvt_error; +# endif +#endif + + return result; +} + + +static enum __codecvt_result +do_in (struct _IO_codecvt *codecvt, __c_mbstate_t *statep, + const char *from_start, const char *from_end, const char **from_stop, + wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop) +{ + enum __codecvt_result result; + +#ifdef _LIBC + struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps; + int status; + size_t dummy; + const unsigned char *from_start_copy = (unsigned char *) from_start; + + codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_start; + codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) to_end; + codecvt->__cd_in.__cd.__data[0].__statep = statep; + + status = DL_CALL_FCT (gs->__fct, + (gs, codecvt->__cd_in.__cd.__data, &from_start_copy, + from_end, NULL, &dummy, 0, 0)); + + *from_stop = from_start_copy; + *to_stop = (wchar_t *) codecvt->__cd_in.__cd.__data[0].__outbuf; + + switch (status) + { + case __GCONV_OK: + case __GCONV_EMPTY_INPUT: + result = __codecvt_ok; + break; + + case __GCONV_FULL_OUTPUT: + case __GCONV_INCOMPLETE_INPUT: + result = __codecvt_partial; + break; + + default: + result = __codecvt_error; + break; + } +#else +# ifdef _GLIBCPP_USE_WCHAR_T + size_t res; + const char *from_start_copy = (const char *) from_start; + size_t from_len = from_end - from_start; + char *to_start_copy = (char *) from_start; + size_t to_len = to_end - to_start; + + res = iconv (codecvt->__cd_in, &from_start_copy, &from_len, + &to_start_copy, &to_len); + + if (res == 0) + result = __codecvt_ok; + else if (to_len == 0) + result = __codecvt_partial; + else if (from_len < codecvt->__codecvt_do_max_length (codecvt)) + result = __codecvt_partial; + else + result = __codecvt_error; +# else + /* Decide what to do. */ + result = __codecvt_error; +# endif +#endif + + return result; +} + + +static int +do_encoding (struct _IO_codecvt *codecvt) +{ +#ifdef _LIBC + /* See whether the encoding is stateful. */ + if (codecvt->__cd_in.__cd.__steps[0].__stateful) + return -1; + /* Fortunately not. Now determine the input bytes for the conversion + necessary for each wide character. */ + if (codecvt->__cd_in.__cd.__steps[0].__min_needed_from + != codecvt->__cd_in.__cd.__steps[0].__max_needed_from) + /* Not a constant value. */ + return 0; + + return codecvt->__cd_in.__cd.__steps[0].__min_needed_from; +#else + /* Worst case scenario. */ + return -1; +#endif +} + + +static int +do_always_noconv (struct _IO_codecvt *codecvt) +{ + return 0; +} + + +static int +do_length (struct _IO_codecvt *codecvt, __c_mbstate_t *statep, + const char *from_start, const char *from_end, _IO_size_t max) +{ + int result; +#ifdef _LIBC + const unsigned char *cp = (const unsigned char *) from_start; + wchar_t to_buf[max]; + struct __gconv_step *gs = codecvt->__cd_in.__cd.__steps; + int status; + size_t dummy; + + codecvt->__cd_in.__cd.__data[0].__outbuf = (char *) to_buf; + codecvt->__cd_in.__cd.__data[0].__outbufend = (char *) &to_buf[max]; + codecvt->__cd_in.__cd.__data[0].__statep = statep; + + status = DL_CALL_FCT (gs->__fct, + (gs, codecvt->__cd_in.__cd.__data, &cp, 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 +} + +#endif /* defined(_GLIBCPP_USE_WCHAR_T) */ |