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