316 lines
9.7 KiB
C
316 lines
9.7 KiB
C
/* Copyright (C) 1993,1997-1999,2001-2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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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 "strfile.h"
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#include "libioP.h"
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#include <string.h>
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#include <wchar.h>
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#include <stdio_ext.h>
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#if 0
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/* The following definitions are for exposition only.
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They map the terminology used in the ANSI/ISO C++ draft standard
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to the implementation. */
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/* allocated: set when a dynamic array object has been allocated, and
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hence should be freed by the destructor for the strstreambuf object. */
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#define ALLOCATED(FP) ((FP)->_f._IO_buf_base && DYNAMIC(FP))
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/* constant: set when the array object has const elements,
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so the output sequence cannot be written. */
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#define CONSTANT(FP) ((FP)->_f._IO_file_flags & _IO_NO_WRITES)
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/* alsize: the suggested minimum size for a dynamic array object. */
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#define ALSIZE(FP) ??? /* not stored */
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/* palloc: points to the function to call to allocate a dynamic array object.*/
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#define PALLOC(FP) \
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((FP)->_s._allocate_buffer == default_alloc ? 0 : (FP)->_s._allocate_buffer)
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/* pfree: points to the function to call to free a dynamic array object. */
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#define PFREE(FP) \
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((FP)->_s._free_buffer == default_free ? 0 : (FP)->_s._free_buffer)
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#endif
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#ifdef TODO
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/* An "unbounded buffer" is when a buffer is supplied, but with no
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specified length. An example is the buffer argument to sprintf.
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*/
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#endif
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void
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_IO_wstr_init_static (fp, ptr, size, pstart)
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_IO_FILE *fp;
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wchar_t *ptr;
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_IO_size_t size;
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wchar_t *pstart;
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{
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wchar_t *end;
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if (size == 0)
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end = ptr + __wcslen (ptr);
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else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
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end = ptr + size;
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else
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/* Even for misaligned ptr make sure there is integral number of wide
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characters. */
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end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
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INTUSE(_IO_wsetb) (fp, ptr, end, 0);
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fp->_wide_data->_IO_write_base = ptr;
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fp->_wide_data->_IO_read_base = ptr;
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fp->_wide_data->_IO_read_ptr = ptr;
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if (pstart)
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{
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fp->_wide_data->_IO_write_ptr = pstart;
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fp->_wide_data->_IO_write_end = end;
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fp->_wide_data->_IO_read_end = pstart;
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}
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else
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{
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fp->_wide_data->_IO_write_ptr = ptr;
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fp->_wide_data->_IO_write_end = ptr;
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fp->_wide_data->_IO_read_end = end;
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}
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/* A null _allocate_buffer function flags the strfile as being static. */
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(((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
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}
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_IO_wint_t
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_IO_wstr_overflow (fp, c)
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_IO_FILE *fp;
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_IO_wint_t c;
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{
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int flush_only = c == WEOF;
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_IO_size_t pos;
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if (fp->_flags & _IO_NO_WRITES)
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return flush_only ? 0 : WEOF;
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if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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fp->_flags |= _IO_CURRENTLY_PUTTING;
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fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr;
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fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
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}
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pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
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if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
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{
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if (fp->_flags & _IO_USER_BUF) /* not allowed to enlarge */
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return WEOF;
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else
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{
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wchar_t *new_buf;
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wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
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_IO_size_t new_size = 2 * _IO_wblen (fp) + 100;
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new_buf
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= (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
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* sizeof (wchar_t));
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if (new_buf == NULL)
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{
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/* __ferror(fp) = 1; */
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return WEOF;
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}
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if (old_buf)
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{
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__wmemcpy (new_buf, old_buf, _IO_wblen (fp));
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(*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
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/* Make sure _IO_setb won't try to delete _IO_buf_base. */
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fp->_wide_data->_IO_buf_base = NULL;
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}
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INTUSE(_IO_wsetb) (fp, new_buf, new_buf + new_size, 1);
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fp->_wide_data->_IO_read_base =
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new_buf + (fp->_wide_data->_IO_read_base - old_buf);
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fp->_wide_data->_IO_read_ptr =
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new_buf + (fp->_wide_data->_IO_read_ptr - old_buf);
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fp->_wide_data->_IO_read_end =
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new_buf + (fp->_wide_data->_IO_read_end - old_buf);
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fp->_wide_data->_IO_write_ptr =
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new_buf + (fp->_wide_data->_IO_write_ptr - old_buf);
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fp->_wide_data->_IO_write_base = new_buf;
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fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end;
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}
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}
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if (!flush_only)
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*fp->_wide_data->_IO_write_ptr++ = c;
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if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
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fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
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return c;
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}
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_IO_wint_t
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_IO_wstr_underflow (fp)
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_IO_FILE *fp;
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{
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if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
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fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
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if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
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{
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fp->_flags &= ~_IO_CURRENTLY_PUTTING;
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fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr;
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fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end;
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}
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if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
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return *fp->_wide_data->_IO_read_ptr;
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else
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return WEOF;
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}
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/* The size of the valid part of the buffer. */
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_IO_ssize_t
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_IO_wstr_count (fp)
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_IO_FILE *fp;
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{
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return ((fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end
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? fp->_wide_data->_IO_write_ptr : fp->_wide_data->_IO_read_end)
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- fp->_wide_data->_IO_read_base);
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}
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_IO_off64_t
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_IO_wstr_seekoff (fp, offset, dir, mode)
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_IO_FILE *fp;
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_IO_off64_t offset;
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int dir;
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int mode;
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{
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_IO_off64_t new_pos;
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if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
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mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);
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if (mode == 0)
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{
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/* Don't move any pointers. But there is no clear indication what
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mode FP is in. Let's guess. */
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if (fp->_IO_file_flags & _IO_NO_WRITES)
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new_pos = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
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else
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new_pos = (fp->_wide_data->_IO_write_ptr
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- fp->_wide_data->_IO_write_base);
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}
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else
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{
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_IO_ssize_t cur_size = _IO_wstr_count (fp);
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new_pos = EOF;
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/* Move the get pointer, if requested. */
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if (mode & _IOS_INPUT)
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += (fp->_wide_data->_IO_read_ptr
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- fp->_wide_data->_IO_read_base);
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0 || (_IO_ssize_t) offset > cur_size)
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return EOF;
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fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
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+ offset);
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fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base
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+ cur_size);
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new_pos = offset;
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}
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/* Move the put pointer, if requested. */
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if (mode & _IOS_OUTPUT)
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{
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switch (dir)
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{
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case _IO_seek_end:
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offset += cur_size;
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break;
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case _IO_seek_cur:
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offset += (fp->_wide_data->_IO_write_ptr
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- fp->_wide_data->_IO_write_base);
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break;
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default: /* case _IO_seek_set: */
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break;
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}
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if (offset < 0 || (_IO_ssize_t) offset > cur_size)
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return EOF;
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fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
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+ offset);
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new_pos = offset;
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}
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}
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return new_pos;
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}
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_IO_wint_t
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_IO_wstr_pbackfail (fp, c)
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_IO_FILE *fp;
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_IO_wint_t c;
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{
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if ((fp->_flags & _IO_NO_WRITES) && c != WEOF)
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return WEOF;
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return INTUSE(_IO_wdefault_pbackfail) (fp, c);
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}
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void
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_IO_wstr_finish (fp, dummy)
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_IO_FILE *fp;
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int dummy;
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{
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if (fp->_wide_data->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
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(((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
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fp->_wide_data->_IO_buf_base = NULL;
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INTUSE(_IO_wdefault_finish) (fp, 0);
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}
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struct _IO_jump_t _IO_wstr_jumps =
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{
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_wstr_finish),
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JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstr_overflow),
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JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
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JUMP_INIT(uflow, (_IO_underflow_t) INTUSE(_IO_wdefault_uflow)),
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JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
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JUMP_INIT(xsputn, INTUSE(_IO_wdefault_xsputn)),
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JUMP_INIT(xsgetn, INTUSE(_IO_wdefault_xsgetn)),
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JUMP_INIT(seekoff, _IO_wstr_seekoff),
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JUMP_INIT(seekpos, _IO_default_seekpos),
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JUMP_INIT(setbuf, _IO_default_setbuf),
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JUMP_INIT(sync, _IO_default_sync),
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JUMP_INIT(doallocate, INTUSE(_IO_wdefault_doallocate)),
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JUMP_INIT(read, _IO_default_read),
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JUMP_INIT(write, _IO_default_write),
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JUMP_INIT(seek, _IO_default_seek),
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JUMP_INIT(close, _IO_default_close),
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JUMP_INIT(stat, _IO_default_stat),
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JUMP_INIT(showmanyc, _IO_default_showmanyc),
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JUMP_INIT(imbue, _IO_default_imbue)
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};
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