1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 37 #endif /* LIBC_SCCS and not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include "namespace.h" 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <limits.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include "un-namespace.h" 49 #include "local.h" 50 51 /* 52 * Small standard I/O/seek/close functions. 53 */ 54 int 55 __sread(void *cookie, char *buf, int n) 56 { 57 FILE *fp = cookie; 58 59 return(_read(fp->_file, buf, (size_t)n)); 60 } 61 62 int 63 __swrite(void *cookie, char const *buf, int n) 64 { 65 FILE *fp = cookie; 66 67 return (_write(fp->_file, buf, (size_t)n)); 68 } 69 70 fpos_t 71 __sseek(void *cookie, fpos_t offset, int whence) 72 { 73 FILE *fp = cookie; 74 75 return (lseek(fp->_file, (off_t)offset, whence)); 76 } 77 78 int 79 __sclose(void *cookie) 80 { 81 82 return (_close(((FILE *)cookie)->_file)); 83 } 84 85 /* 86 * Higher level wrappers. 87 */ 88 int 89 _sread(FILE *fp, char *buf, int n) 90 { 91 int ret; 92 93 ret = (*fp->_read)(fp->_cookie, buf, n); 94 if (ret > 0) { 95 if (fp->_flags & __SOFF) { 96 if (fp->_offset <= OFF_MAX - ret) 97 fp->_offset += ret; 98 else 99 fp->_flags &= ~__SOFF; 100 } 101 } else if (ret < 0) 102 fp->_flags &= ~__SOFF; 103 return (ret); 104 } 105 106 int 107 _swrite(FILE *fp, char const *buf, int n) 108 { 109 int ret; 110 int serrno; 111 112 if (fp->_flags & __SAPP) { 113 serrno = errno; 114 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && 115 (fp->_flags & __SOPT)) 116 return (-1); 117 errno = serrno; 118 } 119 ret = (*fp->_write)(fp->_cookie, buf, n); 120 /* __SOFF removed even on success in case O_APPEND mode is set. */ 121 if (ret >= 0) { 122 if ((fp->_flags & __SOFF) && !(fp->_flags2 & __S2OAP) && 123 fp->_offset <= OFF_MAX - ret) 124 fp->_offset += ret; 125 else 126 fp->_flags &= ~__SOFF; 127 128 } else if (ret < 0) 129 fp->_flags &= ~__SOFF; 130 return (ret); 131 } 132 133 fpos_t 134 _sseek(FILE *fp, fpos_t offset, int whence) 135 { 136 fpos_t ret; 137 int serrno, errret; 138 139 serrno = errno; 140 errno = 0; 141 ret = (*fp->_seek)(fp->_cookie, offset, whence); 142 errret = errno; 143 if (errno == 0) 144 errno = serrno; 145 /* 146 * Disallow negative seeks per POSIX. 147 * It is needed here to help upper level caller 148 * in the cases it can't detect. 149 */ 150 if (ret < 0) { 151 if (errret == 0) { 152 if (offset != 0 || whence != SEEK_CUR) { 153 if (HASUB(fp)) 154 FREEUB(fp); 155 fp->_p = fp->_bf._base; 156 fp->_r = 0; 157 fp->_flags &= ~__SEOF; 158 } 159 fp->_flags |= __SERR; 160 errno = EINVAL; 161 } else if (errret == ESPIPE) 162 fp->_flags &= ~__SAPP; 163 fp->_flags &= ~__SOFF; 164 ret = -1; 165 } else if (fp->_flags & __SOPT) { 166 fp->_flags |= __SOFF; 167 fp->_offset = ret; 168 } 169 return (ret); 170 } 171 172 void 173 __stdio_cancel_cleanup(void * arg) 174 { 175 176 if (arg != NULL) 177 _funlockfile((FILE *)arg); 178 } 179