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bf0d695d | 1 | /* $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */ |
c0c0989a MJ |
2 | /* |
3 | * SPDX-License-Identifier: BSD-3-Clause | |
4 | * | |
5 | * Copyright (C) 1990, 1993 | |
bf0d695d PMF |
6 | * The Regents of the University of California. All rights reserved. |
7 | * | |
8 | * This code is derived from software contributed to Berkeley by | |
9 | * Chris Torek. | |
bf0d695d PMF |
10 | */ |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <assert.h> | |
15 | #include "local.h" | |
16 | ||
17 | /* | |
18 | * Various output routines call wsetup to be sure it is safe to write, | |
19 | * because either _flags does not include __SWR, or _buf is NULL. | |
20 | * _wsetup returns 0 if OK to write, nonzero otherwise. | |
21 | */ | |
22 | int | |
002e1fde | 23 | __swsetup(LTTNG_UST_LFILE *fp) |
bf0d695d PMF |
24 | { |
25 | /* make sure stdio is set up */ | |
26 | // if (!__sdidinit) | |
27 | // __sinit(); | |
28 | ||
29 | /* | |
30 | * If we are not writing, we had better be reading and writing. | |
31 | */ | |
32 | if ((fp->_flags & __SWR) == 0) { | |
33 | if ((fp->_flags & __SRW) == 0) | |
34 | return (EOF); | |
35 | if (fp->_flags & __SRD) { | |
36 | /* clobber any ungetc data */ | |
37 | if (HASUB(fp)) | |
38 | FREEUB(fp); | |
39 | fp->_flags &= ~(__SRD|__SEOF); | |
40 | fp->_r = 0; | |
41 | fp->_p = fp->_bf._base; | |
42 | } | |
43 | fp->_flags |= __SWR; | |
44 | } | |
45 | ||
46 | /* | |
47 | * Make a buffer if necessary, then set _w. | |
48 | */ | |
49 | if (fp->_bf._base == NULL) { | |
50 | // if ((fp->_flags & (__SSTR | __SALC)) == __SSTR) | |
51 | // return (EOF); | |
52 | // __smakebuf(fp); | |
53 | assert(0); | |
54 | } | |
55 | if (fp->_flags & __SLBF) { | |
56 | /* | |
57 | * It is line buffered, so make _lbfsize be -_bufsize | |
58 | * for the putc() macro. We will change _lbfsize back | |
59 | * to 0 whenever we turn off __SWR. | |
60 | */ | |
61 | fp->_w = 0; | |
62 | fp->_lbfsize = -fp->_bf._size; | |
63 | } else | |
64 | fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; | |
65 | return (0); | |
66 | } |