libio/wmemstream.c

   1 /* Copyright (C) 1995-97,99,2000,2002-2004,2006 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include "libioP.h"
  20 #include "strfile.h"
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <wchar.h>
  24
  25
  26 struct _IO_FILE_wmemstream
  27 {
  28   _IO_strfile _sf;
  29   wchar_t **bufloc;
  30   _IO_size_t *sizeloc;
  31 };
  32
  33
  34 static int _IO_wmem_sync (_IO_FILE* fp) __THROW;
  35 static void _IO_wmem_finish (_IO_FILE* fp, int) __THROW;
  36
  37
  38 static const struct _IO_jump_t _IO_wmem_jumps =
  39 {
  40   JUMP_INIT_DUMMY,
  41   JUMP_INIT (finish, _IO_wmem_finish),
  42   JUMP_INIT (overflow, (_IO_overflow_t) _IO_wstr_overflow),
  43   JUMP_INIT (underflow, (_IO_underflow_t) _IO_wstr_underflow),
  44   JUMP_INIT (uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
  45   JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
  46   JUMP_INIT (xsputn, INTUSE(_IO_wdefault_xsputn)),
  47   JUMP_INIT (xsgetn, INTUSE(_IO_wdefault_xsgetn)),
  48   JUMP_INIT (seekoff, _IO_wstr_seekoff),
  49   JUMP_INIT (seekpos, _IO_default_seekpos),
  50   JUMP_INIT (setbuf, _IO_default_setbuf),
  51   JUMP_INIT (sync, _IO_wmem_sync),
  52   JUMP_INIT (doallocate, INTUSE(_IO_wdefault_doallocate)),
  53   JUMP_INIT (read, _IO_default_read),
  54   JUMP_INIT (write, _IO_default_write),
  55   JUMP_INIT (seek, _IO_default_seek),
  56   JUMP_INIT (close, _IO_default_close),
  57   JUMP_INIT (stat, _IO_default_stat),
  58   JUMP_INIT (showmanyc, _IO_default_showmanyc),
  59   JUMP_INIT (imbue, _IO_default_imbue)
  60 };
  61
  62 /* Open a stream that writes into a malloc'd buffer that is expanded as
  63    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
  64    and the number of characters written on fflush or fclose.  */
  65 _IO_FILE *
  66 open_wmemstream (bufloc, sizeloc)
  67      wchar_t **bufloc;
  68      _IO_size_t *sizeloc;
  69 {
  70   struct locked_FILE
  71   {
  72     struct _IO_FILE_wmemstream fp;
  73 #ifdef _IO_MTSAFE_IO
  74     _IO_lock_t lock;
  75 #endif
  76     struct _IO_wide_data wd;
  77   } *new_f;
  78   wchar_t *buf;
  79
  80   new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
  81   if (new_f == NULL)
  82     return NULL;
  83 #ifdef _IO_MTSAFE_IO
  84   new_f->fp._sf._sbf._f._lock = &new_f->lock;
  85 #endif
  86
  87   buf = calloc (1, _IO_BUFSIZ);
  88   if (buf == NULL)
  89     return NULL;
  90
  91   _IO_no_init (&new_f->fp._sf._sbf._f, 0, 0, &new_f->wd, &_IO_wmem_jumps);
  92   _IO_fwide (&new_f->fp._sf._sbf._f, 1);
  93   _IO_wstr_init_static (&new_f->fp._sf._sbf._f, buf,
  94                         _IO_BUFSIZ / sizeof (wchar_t), buf);
  95   new_f->fp._sf._sbf._f._flags2 &= ~_IO_FLAGS2_USER_WBUF;
  96   new_f->fp._sf._s._allocate_buffer = (_IO_alloc_type) malloc;
  97   new_f->fp._sf._s._free_buffer = (_IO_free_type) free;
  98
  99   new_f->fp.bufloc = bufloc;
 100   new_f->fp.sizeloc = sizeloc;
 101
 102   return (_IO_FILE *) &new_f->fp._sf._sbf;
 103 }
 104
 105
 106 static int
 107 _IO_wmem_sync (fp)
 108      _IO_FILE* fp;
 109 {
 110   struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
 111
 112   if (fp->_wide_data->_IO_write_ptr == fp->_wide_data->_IO_write_end)
 113     {
 114       _IO_wstr_overflow (fp, '\0');
 115       --fp->_wide_data->_IO_write_ptr;
 116     }
 117   else
 118     *fp->_wide_data->_IO_write_ptr = '\0';
 119
 120   *mp->bufloc = fp->_wide_data->_IO_write_base;
 121   *mp->sizeloc = (fp->_wide_data->_IO_write_ptr
 122                   - fp->_wide_data->_IO_write_base);
 123
 124   return 0;
 125 }
 126
 127
 128 static void
 129 _IO_wmem_finish (fp, dummy)
 130      _IO_FILE* fp;
 131      int dummy;
 132 {
 133   struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
 134
 135   *mp->bufloc = (wchar_t *) realloc (fp->_wide_data->_IO_write_base,
 136                                      (fp->_wide_data->_IO_write_ptr
 137                                       - fp->_wide_data->_IO_write_base + 1)
 138                                      * sizeof (wchar_t));
 139   if (*mp->bufloc != NULL)
 140     {
 141       size_t len = (fp->_wide_data->_IO_write_ptr
 142                     - fp->_wide_data->_IO_write_base);
 143       (*mp->bufloc)[len] = '\0';
 144       *mp->sizeloc = len;
 145
 146       fp->_wide_data->_IO_buf_base = NULL;
 147     }
 148
 149   _IO_wstr_finish (fp, 0);
 150 }