1 | /*-␍␊ |
2 | * Copyright (c) 1990, 1993␍␊ |
3 | *␉The Regents of the University of California. All rights reserved.␍␊ |
4 | *␍␊ |
5 | * This code is derived from software contributed to Berkeley by␍␊ |
6 | * Chris Torek.␍␊ |
7 | *␍␊ |
8 | * Redistribution and use in source and binary forms, with or without␍␊ |
9 | * modification, are permitted provided that the following conditions␍␊ |
10 | * are met:␍␊ |
11 | * 1. Redistributions of source code must retain the above copyright␍␊ |
12 | * notice, this list of conditions and the following disclaimer.␍␊ |
13 | * 2. Redistributions in binary form must reproduce the above copyright␍␊ |
14 | * notice, this list of conditions and the following disclaimer in the␍␊ |
15 | * documentation and/or other materials provided with the distribution.␍␊ |
16 | * 4. Neither the name of the University nor the names of its contributors␍␊ |
17 | * may be used to endorse or promote products derived from this software␍␊ |
18 | * without specific prior written permission.␍␊ |
19 | *␍␊ |
20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND␍␊ |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE␍␊ |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE␍␊ |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE␍␊ |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL␍␊ |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS␍␊ |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)␍␊ |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT␍␊ |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY␍␊ |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF␍␊ |
30 | * SUCH DAMAGE.␍␊ |
31 | */␍␊ |
32 | ␍␊ |
33 | #if defined(LIBC_SCCS) && !defined(lint)␍␊ |
34 | static char sccsid[] = "@(#)wsetup.c␉8.1 (Berkeley) 6/4/93";␍␊ |
35 | #endif /* LIBC_SCCS and not lint */␍␊ |
36 | #include <sys/cdefs.h>␍␊ |
37 | __FBSDID("$FreeBSD: src/lib/libc/stdio/wsetup.c,v 1.11 2009/01/08 06:38:06 das Exp $");␍␊ |
38 | ␍␊ |
39 | #include <errno.h>␍␊ |
40 | #include <stdio.h>␍␊ |
41 | #include <stdlib.h>␍␊ |
42 | #include "local.h"␍␊ |
43 | ␍␊ |
44 | /*␍␊ |
45 | * Various output routines call wsetup to be sure it is safe to write,␍␊ |
46 | * because either _flags does not include __SWR, or _buf is NULL.␍␊ |
47 | * _wsetup returns 0 if OK to write; otherwise, it returns EOF and sets errno.␍␊ |
48 | */␍␊ |
49 | int␍␊ |
50 | __swsetup(fp)␍␊ |
51 | FILE *fp;␍␊ |
52 | {␍␊ |
53 | ␉/* make sure stdio is set up */␍␊ |
54 | ␉if (!__sdidinit)␍␊ |
55 | ␉␉__sinit();␍␊ |
56 | ␍␊ |
57 | ␉/*␍␊ |
58 | ␉ * If we are not writing, we had better be reading and writing.␍␊ |
59 | ␉ */␍␊ |
60 | ␉if ((fp->_flags & __SWR) == 0) {␍␊ |
61 | ␉␉if ((fp->_flags & __SRW) == 0) {␍␊ |
62 | ␉␉␉errno = EBADF;␍␊ |
63 | ␉␉␉fp->_flags |= __SERR;␍␊ |
64 | ␉␉␉return (EOF);␍␊ |
65 | ␉␉}␍␊ |
66 | ␉␉if (fp->_flags & __SRD) {␍␊ |
67 | ␉␉␉/* clobber any ungetc data */␍␊ |
68 | ␉␉␉if (HASUB(fp))␍␊ |
69 | ␉␉␉␉FREEUB(fp);␍␊ |
70 | ␉␉␉fp->_flags &= ~(__SRD|__SEOF);␍␊ |
71 | ␉␉␉fp->_r = 0;␍␊ |
72 | ␉␉␉fp->_p = fp->_bf._base;␍␊ |
73 | ␉␉}␍␊ |
74 | ␉␉fp->_flags |= __SWR;␍␊ |
75 | ␉}␍␊ |
76 | ␍␊ |
77 | ␉/*␍␊ |
78 | ␉ * Make a buffer if necessary, then set _w.␍␊ |
79 | ␉ */␍␊ |
80 | ␉if (fp->_bf._base == NULL)␍␊ |
81 | ␉␉__smakebuf(fp);␍␊ |
82 | ␉if (fp->_flags & __SLBF) {␍␊ |
83 | ␉␉/*␍␊ |
84 | ␉␉ * It is line buffered, so make _lbfsize be -_bufsize␍␊ |
85 | ␉␉ * for the putc() macro. We will change _lbfsize back␍␊ |
86 | ␉␉ * to 0 whenever we turn off __SWR.␍␊ |
87 | ␉␉ */␍␊ |
88 | ␉␉fp->_w = 0;␍␊ |
89 | ␉␉fp->_lbfsize = -fp->_bf._size;␍␊ |
90 | ␉} else␍␊ |
91 | ␉␉fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;␍␊ |
92 | ␉return (0);␍␊ |
93 | }␍␊ |
94 | |