Annotation of prex-old/usr/lib/libc/stdio/setvbuf.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: * Set one of the three kinds of buffering, optionally including
39: * a buffer.
40: */
41: int
42: setvbuf(fp, buf, mode, size)
43: FILE *fp;
44: char *buf;
45: int mode;
46: size_t size;
47: {
48: int ret, flags;
49: /* int ttyflag; */
50:
51: /*
52: * Verify arguments. The `int' limit on `size' is due to this
53: * particular implementation. Note, buf and size are ignored
54: * when setting _IONBF.
55: */
56: if (mode != _IONBF)
57: if ((mode != _IOFBF && mode != _IOLBF) || (int)size < 0)
58: return (EOF);
59:
60: /*
61: * Write current buffer, if any. Discard unread input (including
62: * ungetc data), cancel line buffering, and free old buffer if
63: * malloc()ed. We also clear any eof condition, as if this were
64: * a seek.
65: */
66: ret = 0;
67: (void)__sflush(fp);
68: if (HASUB(fp))
69: FREEUB(fp);
70: fp->_r = 0;
71: flags = fp->_flags;
72: if (buf != NULL && (flags & __SMBF))
73: free((void *)fp->_bf._base);
74: flags &= ~(__SLBF | __SNBF | __SMBF | __SEOF);
75:
76: /*
77: * Fix up the FILE fields, and set __cleanup for output flush on
78: * exit (since we are buffered in some way).
79: */
80: if (mode == _IOLBF)
81: flags |= __SLBF;
82: fp->_flags = flags;
83:
84: /*
85: * If buffer is NULL, we change only buffering mode.
86: */
87: if (buf == NULL)
88: return 0;
89:
90: fp->_bf._base = fp->_p = (unsigned char *)buf;
91: fp->_bf._size = size;
92: fp->_w = 0;
93: __cleanup = _cleanup;
94:
95: return (ret);
96: }
CVSweb