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 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "namespace.h" 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <limits.h> 47 #include <stdio.h> 48 #include <unistd.h> 49 #include "un-namespace.h" 50 #include "local.h" 51 52 /* 53 * Small standard I/O/seek/close functions. 54 */ 55 int 56 __sread(cookie, buf, n) 57 void *cookie; 58 char *buf; 59 int n; 60 { 61 FILE *fp = cookie; 62 63 return(_read(fp->_file, buf, (size_t)n)); 64 } 65 66 int 67 __swrite(cookie, buf, n) 68 void *cookie; 69 char const *buf; 70 int n; 71 { 72 FILE *fp = cookie; 73 74 return (_write(fp->_file, buf, (size_t)n)); 75 } 76 77 fpos_t 78 __sseek(cookie, offset, whence) 79 void *cookie; 80 fpos_t offset; 81 int whence; 82 { 83 FILE *fp = cookie; 84 85 return (lseek(fp->_file, (off_t)offset, whence)); 86 } 87 88 int 89 __sclose(cookie) 90 void *cookie; 91 { 92 93 return (_close(((FILE *)cookie)->_file)); 94 } 95 96 /* 97 * Higher level wrappers. 98 */ 99 int 100 _sread(fp, buf, n) 101 FILE *fp; 102 char *buf; 103 int n; 104 { 105 int ret; 106 107 ret = (*fp->_read)(fp->_cookie, buf, n); 108 if (ret > 0) { 109 if (fp->_flags & __SOFF) { 110 if (fp->_offset <= OFF_MAX - ret) 111 fp->_offset += ret; 112 else 113 fp->_flags &= ~__SOFF; 114 } 115 } else if (ret < 0) 116 fp->_flags &= ~__SOFF; 117 return (ret); 118 } 119 120 int 121 _swrite(fp, buf, n) 122 FILE *fp; 123 char const *buf; 124 int n; 125 { 126 int ret; 127 int serrno; 128 129 if (fp->_flags & __SAPP) { 130 serrno = errno; 131 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && 132 (fp->_flags & __SOPT)) 133 return (-1); 134 errno = serrno; 135 } 136 ret = (*fp->_write)(fp->_cookie, buf, n); 137 /* __SOFF removed even on success in case O_APPEND mode is set. */ 138 if (ret >= 0) { 139 if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) && 140 fp->_offset <= OFF_MAX - ret) 141 fp->_offset += ret; 142 else 143 fp->_flags &= ~__SOFF; 144 145 } else if (ret < 0) 146 fp->_flags &= ~__SOFF; 147 return (ret); 148 } 149 150 fpos_t 151 _sseek(fp, offset, whence) 152 FILE *fp; 153 fpos_t offset; 154 int whence; 155 { 156 fpos_t ret; 157 int serrno, errret; 158 159 serrno = errno; 160 errno = 0; 161 ret = (*fp->_seek)(fp->_cookie, offset, whence); 162 errret = errno; 163 if (errno == 0) 164 errno = serrno; 165 /* 166 * Disallow negative seeks per POSIX. 167 * It is needed here to help upper level caller 168 * in the cases it can't detect. 169 */ 170 if (ret < 0) { 171 if (errret == 0) { 172 if (offset != 0 || whence != SEEK_CUR) { 173 if (HASUB(fp)) 174 FREEUB(fp); 175 fp->_p = fp->_bf._base; 176 fp->_r = 0; 177 fp->_flags &= ~__SEOF; 178 } 179 fp->_flags |= __SERR; 180 errno = EINVAL; 181 } else if (errret == ESPIPE) 182 fp->_flags &= ~__SAPP; 183 fp->_flags &= ~__SOFF; 184 ret = -1; 185 } else if (fp->_flags & __SOPT) { 186 fp->_flags |= __SOFF; 187 fp->_offset = ret; 188 } 189 return (ret); 190 } 191