Commit | Line | Data |
---|---|---|
8f953e65 CP |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * 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. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #if defined(LIBC_SCCS) && !defined(lint) | |
38 | /*static char *sccsid = "from: @(#)stdio.c 5.3 (Berkeley) 2/24/91";*/ | |
39 | static char *rcsid = "$Id: stdio.c,v 1.15 1994/01/27 06:12:21 proven Exp $"; | |
40 | #endif /* LIBC_SCCS and not lint */ | |
41 | ||
42 | #include <pthread.h> | |
43 | #include <fcntl.h> | |
44 | #include <unistd.h> | |
45 | #include <stdio.h> | |
46 | #include "local.h" | |
47 | ||
48 | /* | |
49 | * Small standard I/O/seek/close functions. | |
50 | * These maintain the `known seek offset' for seek optimisation. | |
51 | */ | |
52 | int __sread(FILE *fp, char *buf, int n) | |
53 | { | |
54 | register int ret; | |
55 | ||
56 | /* if the read succeeded, update the current offset */ | |
57 | if ((ret = fd_table[fp->_file]->ops->read(fd_table[fp->_file]->fd, | |
58 | fd_table[fp->_file]->flags, buf, n)) >= 0) { | |
59 | fp->_offset += ret; | |
60 | } else { | |
61 | fp->_flags &= ~__SOFF; /* paranoia */ | |
62 | } | |
63 | return (ret); | |
64 | } | |
65 | ||
66 | int __swrite(FILE *fp, const char *buf, int n) | |
67 | { | |
68 | if (fp->_flags & __SAPP) | |
69 | (void) lseek(fp->_file, (off_t)0, SEEK_END); | |
70 | fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ | |
71 | return(fd_table[fp->_file]->ops->write(fd_table[fp->_file]->fd, | |
72 | fd_table[fp->_file]->flags, buf, n)); | |
73 | } | |
74 | ||
75 | fpos_t __sseek(FILE *fp, fpos_t offset, int whence) | |
76 | { | |
77 | register off_t ret; | |
78 | ||
79 | ret = lseek(fp->_file, (off_t)offset, whence); | |
80 | if (ret == -1L) | |
81 | fp->_flags &= ~__SOFF; | |
82 | else { | |
83 | fp->_flags |= __SOFF; | |
84 | fp->_offset = ret; | |
85 | } | |
86 | return (ret); | |
87 | } | |
88 | ||
89 | int __sclose(FILE *fp) | |
90 | { | |
91 | return (close(fp->_file)); | |
92 | } |