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 * @(#)stdio.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/stdio.c,v 1.28 2008/05/05 16:14:02 jhb Exp $ 34 */ 35 36 #include "namespace.h" 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <limits.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 #include "un-namespace.h" 44 #include "local.h" 45 46 /* 47 * Small standard I/O/seek/close functions. 48 */ 49 int 50 __sread(void *cookie, char *buf, int n) 51 { 52 FILE *fp = cookie; 53 54 return(_read(fp->pub._fileno, buf, (size_t)n)); 55 } 56 57 int 58 __swrite(void *cookie, const char *buf, int n) 59 { 60 FILE *fp = cookie; 61 62 return (_write(fp->pub._fileno, buf, (size_t)n)); 63 } 64 65 fpos_t 66 __sseek(void *cookie, fpos_t offset, int whence) 67 { 68 FILE *fp = cookie; 69 70 return (lseek(fp->pub._fileno, (off_t)offset, whence)); 71 } 72 73 int 74 __sclose(void *cookie) 75 { 76 77 return (_close(((FILE *)cookie)->pub._fileno)); 78 } 79 80 /* 81 * Higher level wrappers. 82 */ 83 int 84 _sread(FILE *fp, char *buf, int n) 85 { 86 int ret; 87 88 ret = (*fp->_read)(fp->_cookie, buf, n); 89 if (ret > 0) { 90 if (fp->pub._flags & __SOFF) { 91 if (fp->_offset <= OFF_MAX - ret) 92 fp->_offset += ret; 93 else 94 fp->pub._flags &= ~__SOFF; 95 } 96 } else if (ret < 0) 97 fp->pub._flags &= ~__SOFF; 98 return (ret); 99 } 100 101 int 102 _swrite(FILE *fp, const char *buf, int n) 103 { 104 int ret; 105 int serrno; 106 107 if (fp->pub._flags & __SAPP) { 108 serrno = errno; 109 if (_sseek(fp, (fpos_t)0, SEEK_END) == -1 && 110 (fp->pub._flags & __SOPT)) 111 return (-1); 112 errno = serrno; 113 } 114 ret = (*fp->_write)(fp->_cookie, buf, n); 115 /* __SOFF removed even on success in case O_APPEND mode is set. */ 116 if (ret >= 0) { 117 if ((fp->pub._flags & (__SAPP|__SOFF)) == (__SAPP|__SOFF) && 118 fp->_offset <= OFF_MAX - ret) 119 fp->_offset += ret; 120 else 121 fp->pub._flags &= ~__SOFF; 122 123 } else if (ret < 0) 124 fp->pub._flags &= ~__SOFF; 125 return (ret); 126 } 127 128 fpos_t 129 _sseek(FILE *fp, fpos_t offset, int whence) 130 { 131 fpos_t ret; 132 int serrno, errret; 133 134 serrno = errno; 135 errno = 0; 136 ret = (*fp->_seek)(fp->_cookie, offset, whence); 137 errret = errno; 138 if (errno == 0) 139 errno = serrno; 140 /* 141 * Disallow negative seeks per POSIX. 142 * It is needed here to help upper level caller 143 * in the cases it can't detect. 144 */ 145 if (ret < 0) { 146 if (errret == 0) { 147 if (offset != 0 || whence != SEEK_CUR) { 148 if (HASUB(fp)) 149 FREEUB(fp); 150 fp->pub._p = fp->_bf._base; 151 fp->pub._r = 0; 152 fp->pub._flags &= ~__SEOF; 153 } 154 fp->pub._flags |= __SERR; 155 errno = EINVAL; 156 } else if (errret == ESPIPE) 157 fp->pub._flags &= ~__SAPP; 158 fp->pub._flags &= ~__SOFF; 159 ret = -1; 160 } else if (fp->pub._flags & __SOPT) { 161 fp->pub._flags |= __SOFF; 162 fp->_offset = ret; 163 } 164 return (ret); 165 } 166