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glibc  2.9
Functions
wstrops.c File Reference
#include <assert.h>
#include "strfile.h"
#include "libioP.h"
#include <string.h>
#include <wchar.h>
#include <stdio_ext.h>

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Functions

void _IO_wstr_init_static (_IO_FILE *fp, wchar_t *ptr, _IO_size_t size, wchar_t *pstart)
_IO_wint_t _IO_wstr_overflow (_IO_FILE *fp, _IO_wint_t c)
_IO_wint_t _IO_wstr_underflow (_IO_FILE *fp)
_IO_ssize_t _IO_wstr_count (_IO_FILE *fp)
static int enlarge_userbuf (_IO_FILE *fp, _IO_off64_t offset, int reading)
_IO_off64_t _IO_wstr_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode)
_IO_wint_t _IO_wstr_pbackfail (_IO_FILE *fp, _IO_wint_t c)
void _IO_wstr_finish (_IO_FILE *fp, int dummy)

Function Documentation

Definition at line 163 of file wstrops.c.

{
  struct _IO_wide_data *wd = fp->_wide_data;

  return ((wd->_IO_write_ptr > wd->_IO_read_end
          ? wd->_IO_write_ptr : wd->_IO_read_end)
         - wd->_IO_read_base);
}

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void _IO_wstr_finish ( _IO_FILE fp,
int  dummy 
)

Definition at line 334 of file wstrops.c.

{
  if (fp->_wide_data->_IO_buf_base && !(fp->_flags2 & _IO_FLAGS2_USER_WBUF))
    (((_IO_strfile *) fp)->_s._free_buffer) (fp->_wide_data->_IO_buf_base);
  fp->_wide_data->_IO_buf_base = NULL;

  INTUSE(_IO_wdefault_finish) (fp, 0);
}

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void _IO_wstr_init_static ( _IO_FILE fp,
wchar_t *  ptr,
_IO_size_t  size,
wchar_t *  pstart 
)

Definition at line 36 of file wstrops.c.

{
  wchar_t *end;

  if (size == 0)
    end = ptr + __wcslen (ptr);
  else if ((_IO_size_t) ptr + size * sizeof (wchar_t) > (_IO_size_t) ptr)
    end = ptr + size;
  else
    /* Even for misaligned ptr make sure there is integral number of wide
       characters.  */
    end = ptr + (-1 - (_IO_size_t) ptr) / sizeof (wchar_t);
  INTUSE(_IO_wsetb) (fp, ptr, end, 0);

  fp->_wide_data->_IO_write_base = ptr;
  fp->_wide_data->_IO_read_base = ptr;
  fp->_wide_data->_IO_read_ptr = ptr;
  if (pstart)
    {
      fp->_wide_data->_IO_write_ptr = pstart;
      fp->_wide_data->_IO_write_end = end;
      fp->_wide_data->_IO_read_end = pstart;
    }
  else
    {
      fp->_wide_data->_IO_write_ptr = ptr;
      fp->_wide_data->_IO_write_end = ptr;
      fp->_wide_data->_IO_read_end = end;
    }
  /* A null _allocate_buffer function flags the strfile as being static. */
  (((_IO_strfile *) fp)->_s._allocate_buffer) = (_IO_alloc_type)0;
}

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Definition at line 74 of file wstrops.c.

{
  int flush_only = c == WEOF;
  _IO_size_t pos;
  if (fp->_flags & _IO_NO_WRITES)
      return flush_only ? 0 : WEOF;
  if ((fp->_flags & _IO_TIED_PUT_GET) && !(fp->_flags & _IO_CURRENTLY_PUTTING))
    {
      fp->_flags |= _IO_CURRENTLY_PUTTING;
      fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_read_ptr;
      fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end;
    }
  pos = fp->_wide_data->_IO_write_ptr - fp->_wide_data->_IO_write_base;
  if (pos >= (_IO_size_t) (_IO_wblen (fp) + flush_only))
    {
      if (fp->_flags2 & _IO_FLAGS2_USER_WBUF) /* not allowed to enlarge */
       return WEOF;
      else
       {
         wchar_t *new_buf;
         wchar_t *old_buf = fp->_wide_data->_IO_buf_base;
         size_t old_wblen = _IO_wblen (fp);
         _IO_size_t new_size = 2 * old_wblen + 100;
         if (new_size < old_wblen)
           return EOF;
         new_buf
           = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (new_size
                                                               * sizeof (wchar_t));
         if (new_buf == NULL)
           {
             /*        __ferror(fp) = 1; */
             return WEOF;
           }
         if (old_buf)
           {
             __wmemcpy (new_buf, old_buf, old_wblen);
             (*((_IO_strfile *) fp)->_s._free_buffer) (old_buf);
             /* Make sure _IO_setb won't try to delete _IO_buf_base. */
             fp->_wide_data->_IO_buf_base = NULL;
           }

         wmemset (new_buf + old_wblen, L'\0', new_size - old_wblen);

         INTUSE(_IO_wsetb) (fp, new_buf, new_buf + new_size, 1);
         fp->_wide_data->_IO_read_base =
           new_buf + (fp->_wide_data->_IO_read_base - old_buf);
         fp->_wide_data->_IO_read_ptr =
           new_buf + (fp->_wide_data->_IO_read_ptr - old_buf);
         fp->_wide_data->_IO_read_end =
           new_buf + (fp->_wide_data->_IO_read_end - old_buf);
         fp->_wide_data->_IO_write_ptr =
           new_buf + (fp->_wide_data->_IO_write_ptr - old_buf);

         fp->_wide_data->_IO_write_base = new_buf;
         fp->_wide_data->_IO_write_end = fp->_wide_data->_IO_buf_end;
       }
    }

  if (!flush_only)
    *fp->_wide_data->_IO_write_ptr++ = c;
  if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
    fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
  return c;
}

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Definition at line 324 of file wstrops.c.

{
  if ((fp->_flags & _IO_NO_WRITES) && c != WEOF)
    return WEOF;
  return INTUSE(_IO_wdefault_pbackfail) (fp, c);
}

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_IO_off64_t _IO_wstr_seekoff ( _IO_FILE fp,
_IO_off64_t  offset,
int  dir,
int  mode 
)

Definition at line 242 of file wstrops.c.

{
  _IO_off64_t new_pos;

  if (mode == 0 && (fp->_flags & _IO_TIED_PUT_GET))
    mode = (fp->_flags & _IO_CURRENTLY_PUTTING ? _IOS_OUTPUT : _IOS_INPUT);

  if (mode == 0)
    {
      /* Don't move any pointers. But there is no clear indication what
        mode FP is in. Let's guess. */
      if (fp->_IO_file_flags & _IO_NO_WRITES)
        new_pos = fp->_wide_data->_IO_read_ptr - fp->_wide_data->_IO_read_base;
      else
        new_pos = (fp->_wide_data->_IO_write_ptr
                 - fp->_wide_data->_IO_write_base);
    }
  else
    {
      _IO_ssize_t cur_size = _IO_wstr_count (fp);
      new_pos = EOF;

      /* Move the get pointer, if requested. */
      if (mode & _IOS_INPUT)
       {
         switch (dir)
           {
           case _IO_seek_end:
             offset += cur_size;
             break;
           case _IO_seek_cur:
             offset += (fp->_wide_data->_IO_read_ptr
                      - fp->_wide_data->_IO_read_base);
             break;
           default: /* case _IO_seek_set: */
             break;
           }
         if (offset < 0)
           return EOF;
         if ((_IO_ssize_t) offset > cur_size
             && enlarge_userbuf (fp, offset, 1) != 0)
           return EOF;
         fp->_wide_data->_IO_read_ptr = (fp->_wide_data->_IO_read_base
                                     + offset);
         fp->_wide_data->_IO_read_end = (fp->_wide_data->_IO_read_base
                                     + cur_size);
         new_pos = offset;
       }

      /* Move the put pointer, if requested. */
      if (mode & _IOS_OUTPUT)
       {
         switch (dir)
           {
           case _IO_seek_end:
             offset += cur_size;
             break;
           case _IO_seek_cur:
             offset += (fp->_wide_data->_IO_write_ptr
                      - fp->_wide_data->_IO_write_base);
             break;
           default: /* case _IO_seek_set: */
             break;
           }
         if (offset < 0)
           return EOF;
         if ((_IO_ssize_t) offset > cur_size
             && enlarge_userbuf (fp, offset, 0) != 0)
           return EOF;
         fp->_wide_data->_IO_write_ptr = (fp->_wide_data->_IO_write_base
                                      + offset);
         new_pos = offset;
       }
    }
  return new_pos;
}

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Definition at line 143 of file wstrops.c.

{
  if (fp->_wide_data->_IO_write_ptr > fp->_wide_data->_IO_read_end)
    fp->_wide_data->_IO_read_end = fp->_wide_data->_IO_write_ptr;
  if ((fp->_flags & _IO_TIED_PUT_GET) && (fp->_flags & _IO_CURRENTLY_PUTTING))
    {
      fp->_flags &= ~_IO_CURRENTLY_PUTTING;
      fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_write_ptr;
      fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_end;
    }
  if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
    return *fp->_wide_data->_IO_read_ptr;
  else
    return WEOF;
}
static int enlarge_userbuf ( _IO_FILE fp,
_IO_off64_t  offset,
int  reading 
) [static]

Definition at line 175 of file wstrops.c.

{
  if ((_IO_ssize_t) offset <= _IO_blen (fp))
    return 0;

  struct _IO_wide_data *wd = fp->_wide_data;

  _IO_ssize_t oldend = wd->_IO_write_end - wd->_IO_write_base;

  /* Try to enlarge the buffer.  */
  if (fp->_flags2 & _IO_FLAGS2_USER_WBUF)
    /* User-provided buffer.  */
    return 1;

  _IO_size_t newsize = offset + 100;
  wchar_t *oldbuf = wd->_IO_buf_base;
  wchar_t *newbuf
    = (wchar_t *) (*((_IO_strfile *) fp)->_s._allocate_buffer) (newsize
                                                        * sizeof (wchar_t));
  if (newbuf == NULL)
    return 1;

  if (oldbuf != NULL)
    {
      __wmemcpy (newbuf, oldbuf, _IO_wblen (fp));
      (*((_IO_strfile *) fp)->_s._free_buffer) (oldbuf);
      /* Make sure _IO_setb won't try to delete
        _IO_buf_base. */
      wd->_IO_buf_base = NULL;
    }

  INTUSE(_IO_wsetb) (fp, newbuf, newbuf + newsize, 1);

  if (reading)
    {
      wd->_IO_write_base = newbuf + (wd->_IO_write_base - oldbuf);
      wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);
      wd->_IO_write_end = newbuf + (wd->_IO_write_end - oldbuf);
      wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);

      wd->_IO_read_base = newbuf;
      wd->_IO_read_end = wd->_IO_buf_end;
    }
  else
    {
      wd->_IO_read_base = newbuf + (wd->_IO_read_base - oldbuf);
      wd->_IO_read_ptr = newbuf + (wd->_IO_read_ptr - oldbuf);
      wd->_IO_read_end = newbuf + (wd->_IO_read_end - oldbuf);
      wd->_IO_write_ptr = newbuf + (wd->_IO_write_ptr - oldbuf);

      wd->_IO_write_base = newbuf;
      wd->_IO_write_end = wd->_IO_buf_end;
    }

  /* Clear the area between the last write position and th
     new position.  */
  assert (offset >= oldend);
  if (reading)
    wmemset (wd->_IO_read_base + oldend, L'\0', offset - oldend);
  else
    wmemset (wd->_IO_write_base + oldend, L'\0', offset - oldend);

  return 0;
}

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