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#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)makebuf.c 8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
| 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#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)makebuf.c 8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
|
37__FBSDID("$FreeBSD: head/lib/libc/stdio/makebuf.c 249808 2013-04-23 13:33:13Z emaste $");
| 37__FBSDID("$FreeBSD: head/lib/libc/stdio/makebuf.c 249810 2013-04-23 14:36:44Z emaste $");
|
38
39#include "namespace.h"
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <unistd.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include "un-namespace.h"
46
47#include "libc_private.h"
48#include "local.h"
49
50/*
51 * Allocate a file buffer, or switch to unbuffered I/O.
52 * Per the ANSI C standard, ALL tty devices default to line buffered.
53 *
54 * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
55 * optimisation) right after the _fstat() that finds the buffer size.
56 */
57void
| 38
39#include "namespace.h"
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <unistd.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include "un-namespace.h"
46
47#include "libc_private.h"
48#include "local.h"
49
50/*
51 * Allocate a file buffer, or switch to unbuffered I/O.
52 * Per the ANSI C standard, ALL tty devices default to line buffered.
53 *
54 * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
55 * optimisation) right after the _fstat() that finds the buffer size.
56 */
57void
|
58__smakebuf(fp)
59 FILE *fp;
| 58__smakebuf(FILE *fp)
|
60{
61 void *p;
62 int flags;
63 size_t size;
64 int couldbetty;
65
66 if (fp->_flags & __SNBF) {
67 fp->_bf._base = fp->_p = fp->_nbuf;
68 fp->_bf._size = 1;
69 return;
70 }
71 flags = __swhatbuf(fp, &size, &couldbetty);
72 if ((p = malloc(size)) == NULL) {
73 fp->_flags |= __SNBF;
74 fp->_bf._base = fp->_p = fp->_nbuf;
75 fp->_bf._size = 1;
76 return;
77 }
78 __cleanup = _cleanup;
79 flags |= __SMBF;
80 fp->_bf._base = fp->_p = p;
81 fp->_bf._size = size;
82 if (couldbetty && isatty(fp->_file))
83 flags |= __SLBF;
84 fp->_flags |= flags;
85}
86
87/*
88 * Internal routine to determine `proper' buffering for a file.
89 */
90int
| 59{
60 void *p;
61 int flags;
62 size_t size;
63 int couldbetty;
64
65 if (fp->_flags & __SNBF) {
66 fp->_bf._base = fp->_p = fp->_nbuf;
67 fp->_bf._size = 1;
68 return;
69 }
70 flags = __swhatbuf(fp, &size, &couldbetty);
71 if ((p = malloc(size)) == NULL) {
72 fp->_flags |= __SNBF;
73 fp->_bf._base = fp->_p = fp->_nbuf;
74 fp->_bf._size = 1;
75 return;
76 }
77 __cleanup = _cleanup;
78 flags |= __SMBF;
79 fp->_bf._base = fp->_p = p;
80 fp->_bf._size = size;
81 if (couldbetty && isatty(fp->_file))
82 flags |= __SLBF;
83 fp->_flags |= flags;
84}
85
86/*
87 * Internal routine to determine `proper' buffering for a file.
88 */
89int
|
91__swhatbuf(fp, bufsize, couldbetty)
92 FILE *fp;
93 size_t *bufsize;
94 int *couldbetty;
| 90__swhatbuf(FILE *fp, size_t *bufsize, int *couldbetty)
|
95{
96 struct stat st;
97
98 if (fp->_file < 0 || _fstat(fp->_file, &st) < 0) {
99 *couldbetty = 0;
100 *bufsize = BUFSIZ;
101 return (__SNPT);
102 }
103
104 /* could be a tty iff it is a character device */
105 *couldbetty = (st.st_mode & S_IFMT) == S_IFCHR;
106 if (st.st_blksize <= 0) {
107 *bufsize = BUFSIZ;
108 return (__SNPT);
109 }
110
111 /*
112 * Optimise fseek() only if it is a regular file. (The test for
113 * __sseek is mainly paranoia.) It is safe to set _blksize
114 * unconditionally; it will only be used if __SOPT is also set.
115 */
116 *bufsize = st.st_blksize;
117 fp->_blksize = st.st_blksize;
118 return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
119 __SOPT : __SNPT);
120}
| 91{
92 struct stat st;
93
94 if (fp->_file < 0 || _fstat(fp->_file, &st) < 0) {
95 *couldbetty = 0;
96 *bufsize = BUFSIZ;
97 return (__SNPT);
98 }
99
100 /* could be a tty iff it is a character device */
101 *couldbetty = (st.st_mode & S_IFMT) == S_IFCHR;
102 if (st.st_blksize <= 0) {
103 *bufsize = BUFSIZ;
104 return (__SNPT);
105 }
106
107 /*
108 * Optimise fseek() only if it is a regular file. (The test for
109 * __sseek is mainly paranoia.) It is safe to set _blksize
110 * unconditionally; it will only be used if __SOPT is also set.
111 */
112 *bufsize = st.st_blksize;
113 fp->_blksize = st.st_blksize;
114 return ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek ?
115 __SOPT : __SNPT);
116}
|