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 #include "namespace.h" 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include "un-namespace.h" 43 #include "local.h" 44 45 /* 46 * Small standard I/O/seek/close functions. 47 */ 48 int 49 __sread(void *cookie, char *buf, int n) 50 { 51 FILE *fp = cookie; 52 53 return(_read(fp->_file, buf, (size_t)n)); 54 } 55 56 int 57 __swrite(void *cookie, char const *buf, int n) 58 { 59 FILE *fp = cookie; 60 61 return (_write(fp->_file, buf, (size_t)n)); 62 } 63 64 fpos_t 65 __sseek(void *cookie, fpos_t offset, int whence) 66 { 67 FILE *fp = cookie; 68 69 return (lseek(fp->_file, (off_t)offset, whence)); 70 } 71 72 int 73 __sclose(void *cookie) 74 { 75 76 return (_close(((FILE *)cookie)->_file)); 77 } 78 79 /* 80 * Higher level wrappers. 81 */ 82 int 83 _sread(FILE *fp, char *buf, int n) 84 { 85 int ret; 86 87 ret = (*fp->_read)(fp->_cookie, buf, n); 88 if (ret > 0) { 89 if (fp->_flags & __SOFF) { 90 if (fp->_offset <= OFF_MAX - ret) 91 fp->_offset += ret; 92 else 93 fp->_flags &= ~__SOFF; 94 } 95 } else if (ret < 0) 96 fp->_flags &= ~__SOFF; 97 return (ret); 98 } 99 100 int 101 _swrite(FILE *fp, char const *buf, int n) 102 { 103 int ret; 104 int serrno; 105 106 if (fp->_flags & __SAPP) { 107 serrno = errno; 108 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && 109 (fp->_flags & __SOPT)) 110 return (-1); 111 errno = serrno; 112 } 113 ret = (*fp->_write)(fp->_cookie, buf, n); 114 /* __SOFF removed even on success in case O_APPEND mode is set. */ 115 if (ret >= 0) { 116 if ((fp->_flags & __SOFF) && !(fp->_flags2 & __S2OAP) && 117 fp->_offset <= OFF_MAX - ret) 118 fp->_offset += ret; 119 else 120 fp->_flags &= ~__SOFF; 121 122 } else if (ret < 0) 123 fp->_flags &= ~__SOFF; 124 return (ret); 125 } 126 127 fpos_t 128 _sseek(FILE *fp, fpos_t offset, int whence) 129 { 130 fpos_t ret; 131 int serrno, errret; 132 133 serrno = errno; 134 errno = 0; 135 ret = (*fp->_seek)(fp->_cookie, offset, whence); 136 errret = errno; 137 if (errno == 0) 138 errno = serrno; 139 /* 140 * Disallow negative seeks per POSIX. 141 * It is needed here to help upper level caller 142 * in the cases it can't detect. 143 */ 144 if (ret < 0) { 145 if (errret == 0) { 146 if (offset != 0 || whence != SEEK_CUR) { 147 if (HASUB(fp)) 148 FREEUB(fp); 149 fp->_p = fp->_bf._base; 150 fp->_r = 0; 151 fp->_flags &= ~__SEOF; 152 } 153 fp->_flags |= __SERR; 154 errno = EINVAL; 155 } else if (errret == ESPIPE) 156 fp->_flags &= ~__SAPP; 157 fp->_flags &= ~__SOFF; 158 ret = -1; 159 } else if (fp->_flags & __SOPT) { 160 fp->_flags |= __SOFF; 161 fp->_offset = ret; 162 } 163 return (ret); 164 } 165 166 void 167 __stdio_cancel_cleanup(void * arg) 168 { 169 170 if (arg != NULL) 171 _funlockfile((FILE *)arg); 172 } 173