Annotation of prex/usr/lib/libc/stdio/wsetup.c, Revision 1.1.1.1
1.1 nbrk 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: * 3. 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: #include <stdio.h>
34: #include <stdlib.h>
35: #include "local.h"
36:
37:
38: /*
39: * Various output routines call wsetup to be sure it is safe to write,
40: * because either _flags does not include __SWR, or _buf is NULL.
41: * _wsetup returns 0 if OK to write, nonzero otherwise.
42: */
43: int
44: __swsetup(fp)
45: FILE *fp;
46: {
47: /* make sure stdio is set up */
48: if (!__sdidinit)
49: __sinit();
50:
51: /*
52: * If we are not writing, we had better be reading and writing.
53: */
54: if ((fp->_flags & __SWR) == 0) {
55: if ((fp->_flags & __SRW) == 0)
56: return (EOF);
57: if (fp->_flags & __SRD) {
58: /* clobber any ungetc data */
59: if (HASUB(fp))
60: FREEUB(fp);
61: fp->_flags &= ~(__SRD|__SEOF);
62: fp->_r = 0;
63: fp->_p = fp->_bf._base;
64: }
65: fp->_flags |= __SWR;
66: }
67:
68: /*
69: * Make a buffer if necessary, then set _w.
70: */
71: if (fp->_bf._base == NULL)
72: __smakebuf(fp);
73:
74: fp->_w = fp->_flags & (__SNBF|__SLBF) ? 0 : fp->_bf._size;
75: return (0);
76: }
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