1 files changed, 837 insertions, 0 deletions
diff --git a/libio/genops.c b/libio/genops.c
new file mode 100644
index 0000000000..7eb2d43ee1
--- /dev/null
+++ b/libio/genops.c
@@ -0,0 +1,837 @@
+/* 
+Copyright (C) 1993, 1995 Free Software Foundation
+
+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. */
+
+/* Generic or default I/O operations. */
+
+#include "libioP.h"
+#ifdef __STDC__
+#include <stdlib.h>
+#endif
+#include <string.h>
+
+void
+DEFUN(_IO_un_link, (fp),
+      _IO_FILE *fp)
+{
+  if (fp->_flags & _IO_LINKED) {
+    _IO_FILE **f;
+    for (f = &_IO_list_all; *f != NULL; f = &(*f)->_chain) {
+      if (*f == fp) {
+	*f = fp->_chain;
+	break;
+      }
+    }
+    fp->_flags &= ~_IO_LINKED;
+  }
+}
+
+void
+DEFUN(_IO_link_in, (fp),
+      _IO_FILE *fp)
+{
+    if ((fp->_flags & _IO_LINKED) == 0) {
+	fp->_flags |= _IO_LINKED;
+	fp->_chain = _IO_list_all;
+	_IO_list_all = fp;
+    }
+}
+
+/* Return minimum _pos markers
+   Assumes the current get area is the main get area. */
+
+_IO_size_t
+DEFUN(_IO_least_marker, (fp),
+      register _IO_FILE *fp)
+{
+  _IO_ssize_t least_so_far = fp->_IO_read_end - fp->_IO_read_base;
+  register struct _IO_marker *mark;
+  for (mark = fp->_markers; mark != NULL; mark = mark->_next)
+    if (mark->_pos < least_so_far)
+      least_so_far = mark->_pos;
+  return least_so_far;
+}
+
+/* Switch current get area from backup buffer to (start of) main get area. */
+
+void
+DEFUN(_IO_switch_to_main_get_area, (fp),
+      _IO_FILE *fp)
+{
+  char *tmp;
+  fp->_flags &= ~_IO_IN_BACKUP;
+  /* Swap _IO_read_end and _IO_save_end. */
+  tmp = fp->_IO_read_end; fp->_IO_read_end= fp->_IO_save_end; fp->_IO_save_end= tmp;
+  /* Swap _IO_read_base and _IO_save_base. */
+  tmp = fp->_IO_read_base; fp->_IO_read_base = fp->_IO_save_base; fp->_IO_save_base = tmp;
+  fp->_IO_read_ptr = fp->_IO_read_base;
+}
+
+/* Switch current get area from main get area to (end of) backup area. */
+
+void
+DEFUN(_IO_switch_to_backup_area, (fp),
+     register _IO_FILE *fp)
+{
+  char *tmp;
+  fp->_flags |= _IO_IN_BACKUP;
+  /* Swap _IO_read_end and _IO_save_end. */
+  tmp = fp->_IO_read_end; fp->_IO_read_end = fp->_IO_save_end; fp->_IO_save_end = tmp;
+  /* Swap _gbase and _IO_save_base. */
+  tmp = fp->_IO_read_base; fp->_IO_read_base = fp->_IO_save_base; fp->_IO_save_base = tmp;
+  fp->_IO_read_ptr = fp->_IO_read_end;
+}
+
+int
+DEFUN(_IO_switch_to_get_mode, (fp),
+     register _IO_FILE *fp)
+{
+  if (fp->_IO_write_ptr > fp->_IO_write_base)
+    if (_IO_OVERFLOW (fp, EOF) == EOF)
+      return EOF;
+  if (_IO_in_backup(fp))
+    fp->_IO_read_base = fp->_IO_backup_base;
+  else
+    {
+      fp->_IO_read_base = fp->_IO_buf_base;
+      if (fp->_IO_write_ptr > fp->_IO_read_end)
+	fp->_IO_read_end = fp->_IO_write_ptr;
+    }
+  fp->_IO_read_ptr = fp->_IO_write_ptr;
+
+  fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = fp->_IO_read_ptr;
+
+  fp->_flags &= ~_IO_CURRENTLY_PUTTING;
+  return 0;
+}
+
+void
+DEFUN(_IO_free_backup_area, (fp),
+     register _IO_FILE *fp)
+{
+  if (_IO_in_backup (fp))
+    _IO_switch_to_main_get_area(fp);  /* Just in case. */
+  free (fp->_IO_save_base);
+  fp->_IO_save_base = NULL;
+  fp->_IO_save_end = NULL;
+  fp->_IO_backup_base = NULL;
+}
+
+#if 0
+int
+DEFUN(_IO_switch_to_put_mode, (fp),
+      register _IO_FILE *fp)
+{
+  fp->_IO_write_base = fp->_IO_read_ptr;
+  fp->_IO_write_ptr = fp->_IO_read_ptr;
+  /* Following is wrong if line- or un-buffered? */
+  fp->_IO_write_end = fp->_flags & _IO_IN_BACKUP ? fp->_IO_read_end : fp->_IO_buf_end;
+
+  fp->_IO_read_ptr = fp->_IO_read_end;
+  fp->_IO_read_base = fp->_IO_read_end;
+
+  fp->_flags |= _IO_CURRENTLY_PUTTING;
+  return 0;
+}
+#endif
+
+int
+DEFUN(__overflow, (f, ch),
+      _IO_FILE *f AND int ch)
+{
+  return _IO_OVERFLOW (f, ch);
+}
+
+static int
+DEFUN(save_for_backup, (fp),
+      _IO_FILE *fp)
+{
+  /* Append [_IO_read_base.._IO_read_end] to backup area. */
+  int least_mark = _IO_least_marker(fp);
+  /* needed_size is how much space we need in the backup area. */
+  int needed_size = (fp->_IO_read_end - fp->_IO_read_base) - least_mark;
+  int current_Bsize = fp->_IO_save_end - fp->_IO_save_base;
+  int avail; /* Extra space available for future expansion. */
+  int delta;
+  struct _IO_marker *mark;
+  if (needed_size > current_Bsize)
+    {
+      char *new_buffer;
+      avail = 100;
+      new_buffer = (char*)malloc(avail+needed_size);
+      if (new_buffer == NULL)
+	return EOF;		/* FIXME */
+      if (least_mark < 0)
+	{
+	  memcpy(new_buffer + avail,
+		 fp->_IO_save_end + least_mark,
+		 -least_mark);
+	  memcpy(new_buffer +avail - least_mark,
+		 fp->_IO_read_base,
+		 fp->_IO_read_end - fp->_IO_read_base);
+	}
+      else
+	memcpy(new_buffer + avail,
+	       fp->_IO_read_base + least_mark,
+	       needed_size);
+      if (fp->_IO_save_base)
+	free (fp->_IO_save_base);
+      fp->_IO_save_base = new_buffer;
+      fp->_IO_save_end = new_buffer + avail + needed_size;
+    }
+  else
+    {
+      avail = current_Bsize - needed_size;
+      if (least_mark < 0)
+	{
+	  memmove(fp->_IO_save_base + avail,
+		  fp->_IO_save_end + least_mark,
+		  -least_mark);
+	  memcpy(fp->_IO_save_base + avail - least_mark,
+		 fp->_IO_read_base,
+		 fp->_IO_read_end - fp->_IO_read_base);
+	}
+      else if (needed_size > 0)
+	memcpy(fp->_IO_save_base + avail,
+	       fp->_IO_read_base + least_mark,
+	       needed_size);
+    }
+  /* FIXME: Dubious arithmetic if pointers are NULL */
+  fp->_IO_backup_base = fp->_IO_save_base + avail;
+  /* Adjust all the streammarkers. */
+  delta = fp->_IO_read_end - fp->_IO_read_base;
+  for (mark = fp->_markers; mark != NULL; mark = mark->_next)
+    mark->_pos -= delta;
+  return 0;
+}
+
+int
+DEFUN(__underflow, (fp),
+      _IO_FILE *fp)
+{
+  if (_IO_in_put_mode(fp))
+    if (_IO_switch_to_get_mode(fp) == EOF) return EOF;
+  if (fp->_IO_read_ptr < fp->_IO_read_end)
+    return *(unsigned char*)fp->_IO_read_ptr;
+  if (_IO_in_backup(fp))
+    {
+      _IO_switch_to_main_get_area(fp);
+      if (fp->_IO_read_ptr < fp->_IO_read_end)
+	return *fp->_IO_read_ptr;
+    }
+  if (_IO_have_markers(fp))
+    {
+      if (save_for_backup (fp))
+	return EOF;
+    }
+  else if (_IO_have_backup(fp))
+    _IO_free_backup_area(fp);
+  return _IO_UNDERFLOW (fp);
+}
+
+int
+DEFUN(__uflow, (fp),
+     _IO_FILE *fp)
+{
+  if (_IO_in_put_mode(fp))
+    if (_IO_switch_to_get_mode(fp) == EOF) return EOF;
+  if (fp->_IO_read_ptr < fp->_IO_read_end)
+    return *(unsigned char*)fp->_IO_read_ptr++;
+  if (_IO_in_backup(fp))
+    {
+      _IO_switch_to_main_get_area(fp);
+      if (fp->_IO_read_ptr < fp->_IO_read_end)
+	return *fp->_IO_read_ptr++;
+    }
+  if (_IO_have_markers(fp))
+    {
+      if (save_for_backup (fp))
+	return EOF;
+    }
+  else if (_IO_have_backup(fp))
+    _IO_free_backup_area(fp);
+  return _IO_UFLOW (fp);
+}
+
+void
+DEFUN(_IO_setb, (f, b, eb, a),
+      _IO_FILE *f AND char *b AND char *eb AND int a)
+{
+  if (f->_IO_buf_base && !(f->_flags & _IO_USER_BUF))
+    FREE_BUF(f->_IO_buf_base);
+  f->_IO_buf_base = b;
+  f->_IO_buf_end = eb;
+  if (a)
+    f->_flags &= ~_IO_USER_BUF;
+  else
+    f->_flags |= _IO_USER_BUF;
+}
+
+void
+DEFUN(_IO_doallocbuf, (fp),
+      register _IO_FILE *fp)
+{
+  if (fp->_IO_buf_base)
+    return;
+  if (!(fp->_flags & _IO_UNBUFFERED))
+    if (_IO_DOALLOCATE (fp) != EOF)
+      return;
+  _IO_setb(fp, fp->_shortbuf, fp->_shortbuf+1, 0);
+}
+
+int
+DEFUN(_IO_default_underflow, (fp),
+      _IO_FILE *fp)
+{
+  return EOF;
+}
+
+int
+DEFUN(_IO_default_uflow, (fp),
+      _IO_FILE *fp)
+{
+  int ch = _IO_UNDERFLOW (fp);
+  if (ch == EOF)
+    return EOF;
+  return *(unsigned char*)fp->_IO_read_ptr++;
+}
+
+_IO_size_t
+DEFUN(_IO_default_xsputn, (f, data, n),
+      register _IO_FILE *f AND const void *data AND _IO_size_t n)
+{
+  register const char *s = (char*) data;
+  register _IO_size_t more = n;
+  if (more <= 0)
+    return 0;
+  for (;;)
+    {
+      _IO_ssize_t count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */
+      if (count > 0)
+	{
+	  if (count > more)
+	    count = more;
+	  if (count > 20)
+	    {
+	      memcpy(f->_IO_write_ptr, s, count);
+	      s += count;
+	      f->_IO_write_ptr += count;
+            }
+	  else if (count <= 0)
+	    count = 0;
+	  else
+	    {
+	      register char *p = f->_IO_write_ptr;
+	      register _IO_ssize_t i;
+	      for (i = count; --i >= 0; ) *p++ = *s++;
+	      f->_IO_write_ptr = p;
+            }
+	  more -= count;
+        }
+      if (more == 0 || __overflow(f, (unsigned char)*s++) == EOF)
+	break;
+      more--;
+    }
+  return n - more;
+}
+
+_IO_size_t
+DEFUN(_IO_sgetn, (fp, data, n),
+      _IO_FILE *fp AND void *data AND _IO_size_t n)
+{
+  /* FIXME handle putback buffer here! */
+  return _IO_XSGETN (fp, data, n);
+}
+
+_IO_size_t
+DEFUN(_IO_default_xsgetn, (fp, data, n),
+      _IO_FILE *fp AND void *data AND _IO_size_t n)
+{
+  register _IO_size_t more = n;
+  register char *s = (char*) data;
+  for (;;)
+    {
+      _IO_ssize_t count = fp->_IO_read_end - fp->_IO_read_ptr; /* Data available. */
+      if (count > 0)
+	{
+	  if (count > more)
+	    count = more;
+	  if (count > 20)
+	    {
+	      memcpy(s, fp->_IO_read_ptr, count);
+	      s += count;
+	      fp->_IO_read_ptr += count;
+	    }
+	  else if (count <= 0)
+	    count = 0;
+	  else
+	    {
+	      register char *p = fp->_IO_read_ptr;
+	      register int i = (int)count;
+	      while (--i >= 0) *s++ = *p++;
+	      fp->_IO_read_ptr = p;
+            }
+            more -= count;
+        }
+      if (more == 0 || __underflow(fp) == EOF)
+	break;
+    }
+  return n - more;
+}
+
+int
+DEFUN(_IO_sync, (fp),
+      register _IO_FILE *fp)
+{
+  return 0;
+}
+
+_IO_FILE*
+DEFUN(_IO_default_setbuf, (fp, p, len),
+      register _IO_FILE *fp AND char* p AND _IO_ssize_t len)
+{
+    if (_IO_SYNC (fp) == EOF)
+	return NULL;
+    if (p == NULL || len == 0)
+      {
+	fp->_flags |= _IO_UNBUFFERED;
+	_IO_setb(fp, fp->_shortbuf, fp->_shortbuf+1, 0);
+      }
+    else
+      {
+	fp->_flags &= ~_IO_UNBUFFERED;
+	_IO_setb(fp, p, p+len, 0);
+      }
+    fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0;
+    fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0;
+    return fp;
+}
+
+_IO_pos_t
+DEFUN(_IO_default_seekpos, (fp, pos, mode),
+      _IO_FILE *fp AND _IO_pos_t pos AND int mode)
+{
+  return _IO_SEEKOFF (fp, _IO_pos_as_off(pos), 0, mode);
+}
+
+int
+DEFUN(_IO_default_doallocate, (fp),
+      _IO_FILE *fp)
+{
+  char *buf = ALLOC_BUF(_IO_BUFSIZ);
+  if (buf == NULL)
+    return EOF;
+  _IO_setb(fp, buf, buf+_IO_BUFSIZ, 1);
+  return 1;
+}
+
+void
+DEFUN(_IO_init, (fp, flags),
+      register _IO_FILE *fp AND int flags)
+{
+  fp->_flags = _IO_MAGIC|flags;
+  fp->_IO_buf_base = NULL;
+  fp->_IO_buf_end = NULL;
+  fp->_IO_read_base = NULL;
+  fp->_IO_read_ptr = NULL;
+  fp->_IO_read_end = NULL;
+  fp->_IO_write_base = NULL;
+  fp->_IO_write_ptr = NULL;
+  fp->_IO_write_end = NULL;
+  fp->_chain = NULL; /* Not necessary. */
+
+  fp->_IO_save_base = NULL;
+  fp->_IO_backup_base = NULL;
+  fp->_IO_save_end = NULL;
+  fp->_markers = NULL;
+  fp->_cur_column = 0;
+}
+
+int
+DEFUN(_IO_default_sync, (fp),
+      _IO_FILE *fp)
+{
+  return 0;
+}
+
+/* The way the C++ classes are mapped into the C functions in the
+   current implementation, this function can get called twice! */
+
+void
+DEFUN(_IO_default_finish, (fp),
+      _IO_FILE *fp)
+{
+  struct _IO_marker *mark;
+  if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
+    {
+      FREE_BUF(fp->_IO_buf_base);
+      fp->_IO_buf_base = fp->_IO_buf_end = NULL;
+    }
+
+  for (mark = fp->_markers; mark != NULL; mark = mark->_next)
+    mark->_sbuf = NULL;
+
+  if (fp->_IO_save_base)
+    {
+      free (fp->_IO_save_base);
+      fp->_IO_save_base = NULL;
+    }
+
+  _IO_un_link(fp);
+}
+
+_IO_pos_t
+DEFUN(_IO_default_seekoff, (fp, offset, dir, mode),
+      register _IO_FILE *fp AND _IO_off_t offset AND int dir AND int mode)
+{
+    return _IO_pos_BAD;
+}
+
+int
+DEFUN(_IO_sputbackc, (fp, c),
+      register _IO_FILE *fp AND int c)
+{
+  if (fp->_IO_read_ptr > fp->_IO_read_base
+      && (unsigned char)fp->_IO_read_ptr[-1] == (unsigned char)c)
+    {
+      fp->_IO_read_ptr--;
+      return (unsigned char)c;
+    }
+  return _IO_PBACKFAIL (fp, c);
+}
+
+int
+DEFUN(_IO_sungetc, (fp),
+      register _IO_FILE *fp)
+{
+  if (fp->_IO_read_ptr > fp->_IO_read_base)
+    {
+      fp->_IO_read_ptr--;
+      return (unsigned char)*fp->_IO_read_ptr;
+    }
+  else
+    return _IO_PBACKFAIL (fp, EOF);
+}
+
+#if 0 /* Work in progress */
+void
+DEFUN(_IO_set_column, (fp, c),
+      register _IO_FILE *fp AND int c)
+{
+  if (c == -1)
+    fp->_column = -1;
+  else
+    fp->_column = c - (fp->_IO_write_ptr - fp->_IO_write_base);
+}
+#else
+int
+DEFUN(_IO_set_column, (fp, i),
+      register _IO_FILE *fp AND int i)
+{
+  fp->_cur_column = i+1;
+  return 0;
+}
+#endif
+
+
+unsigned
+DEFUN(_IO_adjust_column, (start, line, count),
+      unsigned start AND const char *line AND int count)
+{
+  register const char *ptr = line + count;
+  while (ptr > line)
+    if (*--ptr == '\n')
+      return line + count - ptr - 1;
+  return start + count;
+}
+
+int
+DEFUN(_IO_get_column, (fp),
+      register _IO_FILE *fp)
+{
+  if (fp->_cur_column) 
+    return _IO_adjust_column(fp->_cur_column - 1,
+			      fp->_IO_write_base,
+			      fp->_IO_write_ptr - fp->_IO_write_base);
+  return -1;
+}
+
+int
+DEFUN_VOID(_IO_flush_all)
+{
+  int result = 0;
+  _IO_FILE *fp;
+  for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
+    if (fp->_IO_write_ptr > fp->_IO_write_base
+	&& _IO_OVERFLOW (fp, EOF) == EOF)
+      result = EOF;
+  return result;
+}
+
+void
+DEFUN_VOID(_IO_flush_all_linebuffered)
+{
+  _IO_FILE *fp;
+  for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
+    if (fp->_flags & _IO_LINE_BUF)
+      _IO_OVERFLOW (fp, EOF);
+}
+
+void
+DEFUN_VOID(_IO_unbuffer_all)
+{
+  _IO_FILE *fp;
+  for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
+    if (! (fp->_flags & _IO_UNBUFFERED))
+      _IO_SETBUF (fp, NULL, 0);
+}
+
+void
+DEFUN_VOID(_IO_cleanup)
+{
+  _IO_flush_all ();
+
+  /* We currently don't have a reliable mechanism for making sure that
+     C++ static destructors are executed in the correct order.
+     So it is possible that other static destructord might want to
+     write to cout - and they're supposed to be able to do so.
+
+     The following will make the standard streambufs be unbuffered, 
+     which forces any output from late destructors to be written out. */
+  _IO_unbuffer_all ();
+}
+
+void
+DEFUN(_IO_init_marker, (marker, fp),
+      struct _IO_marker *marker AND _IO_FILE *fp)
+{
+  marker->_sbuf = fp;
+  if (_IO_in_put_mode(fp))
+    _IO_switch_to_get_mode(fp);
+  if (_IO_in_backup(fp))
+    marker->_pos = fp->_IO_read_ptr - fp->_IO_read_end;
+  else
+    marker->_pos = fp->_IO_read_ptr - fp->_IO_read_base;
+  
+  /* Should perhaps sort the chain? */
+  marker->_next = fp->_markers;
+  fp->_markers = marker;
+}
+
+void
+DEFUN(_IO_remove_marker, (marker),
+      register struct _IO_marker *marker)
+{
+  /* Unlink from sb's chain. */
+  register struct _IO_marker **ptr = &marker->_sbuf->_markers;
+  for (; ; ptr = &(*ptr)->_next)
+    {
+      if (*ptr == NULL)
+	break;
+      else if (*ptr == marker)
+	{
+	  *ptr = marker->_next;
+	  return;
+	}
+    }
+#if 0
+    if _sbuf has a backup area that is no longer needed, should we delete
+    it now, or wait until the next underflow?
+#endif
+}
+
+#define BAD_DELTA EOF
+
+int
+DEFUN(_IO_marker_difference, (mark1, mark2),
+      struct _IO_marker *mark1 AND struct _IO_marker *mark2)
+{
+  return mark1->_pos - mark2->_pos;
+}
+
+/* Return difference between MARK and current posistion of MARK's stream. */
+int
+DEFUN(_IO_marker_delta, (mark),
+      struct _IO_marker *mark)
+{
+  int cur_pos;
+  if (mark->_sbuf == NULL)
+    return BAD_DELTA;
+  if (_IO_in_backup(mark->_sbuf))
+    cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_end;
+  else
+    cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_base;
+  return mark->_pos - cur_pos;
+}
+
+int
+DEFUN(_IO_seekmark, (fp, mark, delta),
+      _IO_FILE *fp AND struct _IO_marker *mark AND int delta)
+{
+  if (mark->_sbuf != fp)
+    return EOF;
+ if (mark->_pos >= 0)
+    {
+      if (_IO_in_backup(fp))
+	_IO_switch_to_main_get_area(fp);
+      fp->_IO_read_ptr = fp->_IO_read_base + mark->_pos;
+    }
+  else
+    {
+      if (!_IO_in_backup(fp))
+	_IO_switch_to_backup_area(fp);
+      fp->_IO_read_ptr = fp->_IO_read_end + mark->_pos;
+    }
+  return 0;
+}
+
+void
+DEFUN(_IO_unsave_markers, (fp),
+     register _IO_FILE *fp)
+{
+  register struct _IO_marker *mark = fp->_markers;
+  if (mark)
+    {
+#ifdef TODO
+      streampos offset = seekoff(0, ios::cur, ios::in);
+      if (offset != EOF)
+	{
+	  offset += eGptr() - Gbase();
+	  for ( ; mark != NULL; mark = mark->_next)
+	    mark->set_streampos(mark->_pos + offset);
+	}
+    else
+      {
+	for ( ; mark != NULL; mark = mark->_next)
+	  mark->set_streampos(EOF);
+      }
+#endif
+      fp->_markers = 0;
+    }
+
+  if (_IO_have_backup(fp))
+    _IO_free_backup_area(fp);
+}
+
+int
+DEFUN(_IO_nobackup_pbackfail, (fp, c),
+     register _IO_FILE *fp AND int c)
+{
+  if (fp->_IO_read_ptr > fp->_IO_read_base)
+	fp->_IO_read_ptr--;
+  if (c != EOF && *fp->_IO_read_ptr != c)
+      *fp->_IO_read_ptr = c;
+  return (unsigned char)c;
+}
+
+int
+DEFUN(_IO_default_pbackfail, (fp, c),
+      register _IO_FILE *fp AND int c)
+{
+  if (fp->_IO_read_ptr <= fp->_IO_read_base)
+      {
+	/* Need to handle a filebuf in write mode (switch to read mode). FIXME!*/
+	if (_IO_have_backup(fp) && !_IO_in_backup(fp))
+	  _IO_switch_to_backup_area(fp);
+	
+	if (!_IO_have_backup(fp))
+	  {
+	    /* No backup buffer: allocate one. */
+	    /* Use nshort buffer, if unused? (probably not)  FIXME */
+	    int backup_size = 128;
+	    char *bbuf = (char*)malloc(backup_size);
+	    if (bbuf == NULL)
+	      return EOF;
+	    fp->_IO_save_base = bbuf;
+	    fp->_IO_save_end = fp->_IO_save_base + backup_size;
+	    fp->_IO_backup_base = fp->_IO_save_end;
+	    _IO_switch_to_backup_area(fp);
+	  }
+	else if (fp->_IO_read_ptr <= fp->_IO_read_base)
+	  {
+	    /* Increase size of existing backup buffer. */
+	    _IO_size_t new_size;
+	    _IO_size_t old_size = fp->_IO_read_end - fp->_IO_read_base;
+	    char *new_buf;
+	    new_size = 2 * old_size;
+	    new_buf = (char*)malloc(new_size);
+	    if (new_buf == NULL)
+	      return EOF;
+	    memcpy(new_buf+(new_size-old_size), fp->_IO_read_base, old_size);
+	    free (fp->_IO_read_base);
+	    _IO_setg(fp,
+		     new_buf, new_buf+(new_size-old_size), new_buf+new_size);
+	    fp->_IO_backup_base = fp->_IO_read_ptr;
+	  }
+      }
+  fp->_IO_read_ptr--;
+  if (c != EOF && *fp->_IO_read_ptr != c)
+    *fp->_IO_read_ptr = c;
+  return (unsigned char)*fp->_IO_read_ptr;
+}
+
+_IO_pos_t
+DEFUN(_IO_default_seek, (fp, offset, dir),
+      _IO_FILE *fp AND _IO_off_t offset AND int dir)
+{
+  return _IO_pos_BAD;
+}
+
+int
+DEFUN(_IO_default_stat, (fp, st),
+      _IO_FILE *fp AND void* st)
+{
+  return EOF;
+}
+
+_IO_ssize_t
+DEFUN(_IO_default_read, (fp, data, n),
+      register _IO_FILE* fp AND void* data AND _IO_ssize_t n)
+{
+  return -1;
+}
+
+_IO_ssize_t
+DEFUN(_IO_default_write, (fp, data, n),
+      register _IO_FILE* fp AND const void* data AND _IO_ssize_t n)
+{
+  return 0;
+}
+
+
+#ifdef TODO
+#if defined(linux)
+#define IO_CLEANUP ;
+#endif
+
+#ifdef IO_CLEANUP
+  IO_CLEANUP
+#else
+struct __io_defs {
+    __io_defs() { }
+    ~__io_defs() { _IO_cleanup(); }
+};   
+__io_defs io_defs__;
+#endif
+
+#endif /* TODO */