1 files changed, 129 insertions, 0 deletions
diff --git a/libio/memstream.c b/libio/memstream.c
new file mode 100644
index 0000000000..b1cefb0959
--- /dev/null
+++ b/libio/memstream.c
@@ -0,0 +1,129 @@
+/* Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "strfile.h"
+#include "libioP.h"
+#include <stdlib.h>
+
+
+struct _IO_FILE_memstream
+{
+  _IO_strfile _sf;
+  char **bufloc;
+  _IO_size_t *sizeloc;
+};
+
+
+static int _IO_mem_sync __P ((_IO_FILE* fp));
+static int _IO_mem_close __P ((_IO_FILE* fp));
+
+
+static const struct _IO_jump_t _IO_mem_jumps =
+{
+  JUMP_INIT_DUMMY,
+  JUMP_INIT (finish, _IO_str_finish),
+  JUMP_INIT (overflow, _IO_str_overflow),
+  JUMP_INIT (underflow, _IO_str_underflow),
+  JUMP_INIT (uflow, _IO_default_uflow),
+  JUMP_INIT (pbackfail, _IO_str_pbackfail),
+  JUMP_INIT (xsputn, _IO_default_xsputn),
+  JUMP_INIT (xsgetn, _IO_default_xsgetn),
+  JUMP_INIT (seekoff, _IO_str_seekoff),
+  JUMP_INIT (seekpos, _IO_default_seekpos),
+  JUMP_INIT (setbuf, _IO_default_setbuf),
+  JUMP_INIT (sync, _IO_mem_sync),
+  JUMP_INIT (doallocate, _IO_default_doallocate),
+  JUMP_INIT (read, _IO_default_read),
+  JUMP_INIT (write, _IO_default_write),
+  JUMP_INIT (seek, _IO_default_seek),
+  JUMP_INIT (close, _IO_mem_close),
+  JUMP_INIT (stat, _IO_default_stat)
+};
+
+/* Open a stream that writes into a malloc'd buffer that is expanded as
+   necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
+   and the number of characters written on fflush or fclose.  */
+_IO_FILE *
+open_memstream (bufloc, sizeloc)
+     char **bufloc;
+     _IO_size_t *sizeloc;
+{
+  struct _IO_FILE_memstream *fp;
+  char *buf;
+
+  fp = (struct _IO_FILE_memstream *)
+    malloc (sizeof (struct _IO_FILE_memstream));
+  if (fp == NULL)
+    return NULL;
+
+  buf = ALLOC_BUF (_IO_BUFSIZ);
+  _IO_init (&fp->_sf._f, 0);
+  _IO_JUMPS (&fp->_sf._f) = &_IO_mem_jumps;
+  _IO_str_init_static (&fp->_sf._f, buf, _IO_BUFSIZ, buf);
+  fp->_sf._f._flags &= ~_IO_USER_BUF;
+  fp->_sf._s._allocate_buffer = (_IO_alloc_type) malloc;
+  fp->_sf._s._free_buffer = (_IO_free_type) free;
+
+  return &fp->_sf._f;
+}
+
+
+static int
+_IO_mem_sync (fp)
+     _IO_FILE* fp;
+{
+  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
+  int res;
+
+  res = _IO_default_sync (fp);
+  if (res < 0)
+    return res;
+
+  if (fp->_IO_write_ptr == fp->_IO_write_end)
+    {
+      _IO_str_overflow (fp, '\0');
+      --fp->_IO_write_ptr;
+    }
+  else
+    *fp->_IO_write_ptr = '\0';
+
+  *mp->bufloc = fp->_IO_buf_base;
+  *mp->sizeloc = _IO_blen (fp);
+
+  return 0;
+}
+
+
+static int _IO_mem_close (fp)
+     _IO_FILE* fp;
+{
+  struct _IO_FILE_memstream *mp = (struct _IO_FILE_memstream *) fp;
+  int res;
+
+  res = _IO_default_close (fp);
+  if (res < 0)
+    return res;
+
+  *mp->bufloc = (char *) realloc (fp->_IO_buf_base, _IO_blen (fp) + 1);
+  if (*mp->bufloc == NULL)
+    return -1;
+  (*mp->bufloc)[_IO_blen (fp)] = '\0';
+  *mp->sizeloc = _IO_blen (fp);
+
+  return 0;
+}