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 <stdlib.h> 49 #include <unistd.h> 50 #include "un-namespace.h" 51 #include "local.h" 52 53 /* 54 * Small standard I/O/seek/close functions. 55 */ 56 int 57 __sread(cookie, buf, n) 58 void *cookie; 59 char *buf; 60 int n; 61 { 62 FILE *fp = cookie; 63 64 return(_read(fp->_file, buf, (size_t)n)); 65 } 66 67 int 68 __swrite(cookie, buf, n) 69 void *cookie; 70 char const *buf; 71 int n; 72 { 73 FILE *fp = cookie; 74 75 return (_write(fp->_file, buf, (size_t)n)); 76 } 77 78 fpos_t 79 __sseek(cookie, offset, whence) 80 void *cookie; 81 fpos_t offset; 82 int whence; 83 { 84 FILE *fp = cookie; 85 86 return (lseek(fp->_file, (off_t)offset, whence)); 87 } 88 89 int 90 __sclose(cookie) 91 void *cookie; 92 { 93 94 return (_close(((FILE *)cookie)->_file)); 95 } 96 97 /* 98 * Higher level wrappers. 99 */ 100 int 101 _sread(fp, buf, n) 102 FILE *fp; 103 char *buf; 104 int n; 105 { 106 int ret; 107 108 ret = (*fp->_read)(fp->_cookie, buf, n); 109 if (ret > 0) { 110 if (fp->_flags & __SOFF) { 111 if (fp->_offset <= OFF_MAX - ret) 112 fp->_offset += ret; 113 else 114 fp->_flags &= ~__SOFF; 115 } 116 } else if (ret < 0) 117 fp->_flags &= ~__SOFF; 118 return (ret); 119 } 120 121 int 122 _swrite(fp, buf, n) 123 FILE *fp; 124 char const *buf; 125 int n; 126 { 127 int ret; 128 int serrno; 129 130 if (fp->_flags & __SAPP) { 131 serrno = errno; 132 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && 133 (fp->_flags & __SOPT)) 134 return (-1); 135 errno = serrno; 136 } 137 ret = (*fp->_write)(fp->_cookie, buf, n); 138 /* __SOFF removed even on success in case O_APPEND mode is set. */ 139 if (ret >= 0) { 140 if ((fp->_flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) && 141 fp->_offset <= OFF_MAX - ret) 142 fp->_offset += ret; 143 else 144 fp->_flags &= ~__SOFF; 145 146 } else if (ret < 0) 147 fp->_flags &= ~__SOFF; 148 return (ret); 149 } 150 151 fpos_t 152 _sseek(fp, offset, whence) 153 FILE *fp; 154 fpos_t offset; 155 int whence; 156 { 157 fpos_t ret; 158 int serrno, errret; 159 160 serrno = errno; 161 errno = 0; 162 ret = (*fp->_seek)(fp->_cookie, offset, whence); 163 errret = errno; 164 if (errno == 0) 165 errno = serrno; 166 /* 167 * Disallow negative seeks per POSIX. 168 * It is needed here to help upper level caller 169 * in the cases it can't detect. 170 */ 171 if (ret < 0) { 172 if (errret == 0) { 173 if (offset != 0 || whence != SEEK_CUR) { 174 if (HASUB(fp)) 175 FREEUB(fp); 176 fp->_p = fp->_bf._base; 177 fp->_r = 0; 178 fp->_flags &= ~__SEOF; 179 } 180 fp->_flags |= __SERR; 181 errno = EINVAL; 182 } else if (errret == ESPIPE) 183 fp->_flags &= ~__SAPP; 184 fp->_flags &= ~__SOFF; 185 ret = -1; 186 } else if (fp->_flags & __SOPT) { 187 fp->_flags |= __SOFF; 188 fp->_offset = ret; 189 } 190 return (ret); 191 } 192