libstdc++-v3/config/c_io_libio_codecvt.c

   1 /* Copyright (C) 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3
   4    This library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License as
   6    published by the Free Software Foundation; either version 2, or (at
   7    your option) any later version.
   8
   9    This library is distributed in the hope that it will be useful, but
  10    WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this library; see the file COPYING.  If not, write to
  16    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  17    MA 02111-1307, USA.
  18
  19    As a special exception, if you link this library with files
  20    compiled with a GNU compiler to produce an executable, this does
  21    not cause the resulting executable to be covered by the GNU General
  22    Public License.  This exception does not however invalidate any
  23    other reasons why the executable file might be covered by the GNU
  24    General Public License.  */
  25
  26 /* Slightly modified from glibc/libio/iofwide.c */
  27
  28 #include <libio.h>
  29
  30
  31 /* Prototypes of libio's codecvt functions.  */
  32 static enum __codecvt_result
  33 do_out(struct _IO_codecvt *codecvt, __mbstate_t *statep,
  34        const wchar_t *from_start, const wchar_t *from_end,
  35        const wchar_t **from_stop, char *to_start, char *to_end,
  36        char **to_stop);
  37
  38 static enum __codecvt_result
  39 do_unshift(struct _IO_codecvt *codecvt, __mbstate_t *statep, char *to_start,
  40            char *to_end, char **to_stop);
  41
  42 static enum __codecvt_result
  43 do_in(struct _IO_codecvt *codecvt, __mbstate_t *statep,
  44       const char *from_start, const char *from_end, const char **from_stop,
  45       wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop);
  46
  47 static int
  48 do_encoding(struct _IO_codecvt *codecvt);
  49
  50 static int
  51 do_length(struct _IO_codecvt *codecvt, __mbstate_t *statep,
  52           const char *from_start, const char *from_end, _IO_size_t max);
  53
  54 static int
  55 do_max_length(struct _IO_codecvt *codecvt);
  56
  57 static int
  58 do_always_noconv(struct _IO_codecvt *codecvt);
  59
  60
  61 /* The functions used in `codecvt' for libio are always the same.  */
  62 struct _IO_codecvt __c_libio_codecvt =
  63 {
  64   .__codecvt_destr = NULL,              /* Destructor, never used.  */
  65   .__codecvt_do_out = do_out,
  66   .__codecvt_do_unshift = do_unshift,
  67   .__codecvt_do_in = do_in,
  68   .__codecvt_do_encoding = do_encoding,
  69   .__codecvt_do_always_noconv = do_always_noconv,
  70   .__codecvt_do_length = do_length,
  71   .__codecvt_do_max_length = do_max_length
  72 };
  73
  74 static enum __codecvt_result
  75 do_out(struct _IO_codecvt *codecvt, __mbstate_t *statep,
  76        const wchar_t *from_start, const wchar_t *from_end,
  77        const wchar_t **from_stop, char *to_start, char *to_end,
  78        char **to_stop)
  79 {
  80   enum __codecvt_result res = __codecvt_ok;
  81
  82   while (from_start < from_end)
  83     {
  84       if (to_start >= to_end)
  85         {
  86           res = __codecvt_partial;
  87           break;
  88         }
  89       *to_start++ = (char) *from_start++;
  90     }
  91
  92   *from_stop = from_start;
  93   *to_stop = to_start;
  94
  95   return res;
  96 }
  97
  98
  99 static enum __codecvt_result
 100 do_unshift(struct _IO_codecvt *codecvt, __mbstate_t *statep,
 101            char *to_start, char *to_end, char **to_stop)
 102 {
 103   *to_stop = to_start;
 104   return __codecvt_ok;
 105 }
 106
 107
 108 static enum __codecvt_result
 109 do_in(struct _IO_codecvt *codecvt, __mbstate_t *statep,
 110       const char *from_start, const char *from_end, const char **from_stop,
 111       wchar_t *to_start, wchar_t *to_end, wchar_t **to_stop)
 112 {
 113   enum __codecvt_result res = __codecvt_ok;
 114
 115   while (from_start < from_end)
 116     {
 117       if (to_start >= to_end)
 118         {
 119           res = __codecvt_partial;
 120           break;
 121         }
 122       *to_start++ = (wchar_t) *from_start++;
 123     }
 124
 125   *from_stop = from_start;
 126   *to_stop = to_start;
 127
 128   return res;
 129 }
 130
 131
 132 static int
 133 do_encoding(struct _IO_codecvt *codecvt)
 134 { return 1; }
 135
 136
 137 static int
 138 do_always_noconv(struct _IO_codecvt *codecvt)
 139 { return 0; }
 140
 141
 142 static int
 143 do_length(struct _IO_codecvt *codecvt, __mbstate_t *statep,
 144           const char *from_start, const char *from_end, _IO_size_t max)
 145 { return from_end - from_start; }
 146
 147
 148 static int
 149 do_max_length(struct _IO_codecvt *codecvt)
 150 { return 1; }