* sysdeps/unix/readdir.c: Make sure we don't modify errno when we reached EOF.
[glibc.git] / stdio / newstream.c
blobf792649e6ea2d03f9022181c3bbcb8d67f0d4f34
1 /* Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <stddef.h>
20 #include <stdio.h>
21 #include <stdlib.h>
24 /* Return a new, zeroed, stream.
25 You must set its cookie and io_mode.
26 The first operation will give it a buffer unless you do.
27 It will also give it the default functions unless you set the `seen' flag.
28 Returns NULL if a stream can't be created. */
29 FILE *
30 __newstream (void)
32 register FILE *stream;
34 stream = __stdio_head;
35 while (__validfp (stream))
36 stream = stream->__next;
37 if (stream == NULL)
39 /* None to reuse. */
40 stream = (FILE *) malloc (sizeof (FILE));
41 if (stream == NULL)
42 return NULL;
43 stream->__next = __stdio_head;
44 __stdio_head = stream;
47 __invalidate (stream);
48 stream->__magic = _IOMAGIC;
49 stream->__offset = (fpos_t) -1;
50 stream->__target = (fpos_t) -1;
52 return stream;