scoutos / prex-0.9.0 / usr / lib / libc / stdio / setvbuf.c @ 03e9c04a
History | View | Annotate | Download (2.97 KB)
1 | 03e9c04a | Brad Neuman | /*-
|
---|---|---|---|
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 | } |