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. 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#if 0 39static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 40#endif 41static const char rcsid[] =
|
42 "$FreeBSD: head/lib/libc/stdio/stdio.c 82735 2001-09-01 11:21:28Z ache $";
|
42 "$FreeBSD: head/lib/libc/stdio/stdio.c 82807 2001-09-02 19:10:10Z ache $"; |
43#endif /* LIBC_SCCS and not lint */ 44 45#include "namespace.h" 46#include <errno.h> 47#include <fcntl.h>
|
48#include <limits.h>
|
48#include <stdio.h> 49#include <unistd.h> 50#include "un-namespace.h" 51#include "local.h" 52 53/* 54 * Small standard I/O/seek/close functions.
|
56 * These maintain the `known seek offset' for seek optimisation.
|
55 */ 56int 57__sread(cookie, buf, n) 58 void *cookie; 59 char *buf; 60 int n; 61{ 62 register FILE *fp = cookie;
|
65 register int ret;
|
63
|
67 ret = _read(fp->_file, buf, (size_t)n);
68 /* if the read succeeded, update the current offset */
69 if (ret >= 0) {
70 if (fp->_flags & __SOFF) {
71 if (fp->_offset > OFF_MAX - ret) {
72 errno = EOVERFLOW;
73 ret = -1;
74 } else {
75 fp->_offset += ret;
76 return (ret);
77 }
78 } else
79 return (ret);
80 }
81 fp->_flags &= ~__SOFF;
82 return (ret);
|
64 return(_read(fp->_file, buf, (size_t)n)); |
65} 66 67int 68__swrite(cookie, buf, n) 69 void *cookie; 70 char const *buf; 71 int n; 72{ 73 register FILE *fp = cookie; 74
|
93 if (fp->_flags & __SAPP)
94 (void) lseek(fp->_file, (off_t)0, SEEK_END);
95 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */
|
75 return (_write(fp->_file, buf, (size_t)n)); 76} 77 78fpos_t 79__sseek(cookie, offset, whence) 80 void *cookie; 81 fpos_t offset; 82 int whence; 83{ 84 register FILE *fp = cookie;
|
106 register off_t ret;
107 int serrno, errret;
|
85
|
109 serrno = errno;
110 errno = 0;
111 ret = lseek(fp->_file, (off_t)offset, whence);
112 errret = errno;
113 if (errno == 0)
114 errno = serrno;
115 /*
116 * Disallow negative seeks per POSIX.
117 * It is needed here to help upper level caller
118 * (fseek) in the cases it can't detect.
119 */
120 if (ret < 0) {
121 if (errret == 0) {
122 fp->_flags |= __SERR;
123 errno = EINVAL;
124 }
125 fp->_flags &= ~__SOFF;
126 ret = -1;
127 } else {
128 fp->_flags |= __SOFF;
129 fp->_offset = ret;
130 }
131 return (ret);
|
86 return (lseek(fp->_file, (off_t)offset, whence)); |
87} 88 89int 90__sclose(cookie) 91 void *cookie; 92{ 93 94 return (_close(((FILE *)cookie)->_file)); 95}
|