1 /** @file 2 Small standard I/O/seek/close functions. 3 These maintain the `known seek offset' for seek optimisation. 4 5 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 6 This program and the accompanying materials are licensed and made available 7 under the terms and conditions of the BSD License that accompanies this 8 distribution. The full text of the license may be found at 9 http://opensource.org/licenses/bsd-license. 10 11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 13 14 Copyright (c) 1990, 1993 15 The Regents of the University of California. All rights reserved. 16 17 This code is derived from software contributed to Berkeley by 18 Chris Torek. 19 20 Redistribution and use in source and binary forms, with or without 21 modification, are permitted provided that the following conditions 22 are met: 23 - Redistributions of source code must retain the above copyright 24 notice, this list of conditions and the following disclaimer. 25 - Redistributions in binary form must reproduce the above copyright 26 notice, this list of conditions and the following disclaimer in the 27 documentation and/or other materials provided with the distribution. 28 - Neither the name of the University nor the names of its contributors 29 may be used to endorse or promote products derived from this software 30 without specific prior written permission. 31 32 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 33 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE 36 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 37 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 38 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 39 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 40 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 41 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 POSSIBILITY OF SUCH DAMAGE. 43 44 NetBSD: stdio.c,v 1.13 2003/08/07 16:43:33 agc Exp 45 stdio.c 8.1 (Berkeley) 6/4/93 46 **/ 47 #include <LibConfig.h> 48 49 #include "namespace.h" 50 51 #include <assert.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <stdio.h> 55 #include <unistd.h> 56 57 #include "reentrant.h" 58 #include "local.h" 59 60 int 61 __sread(void *cookie, char *buf, int n) 62 { 63 FILE *fp = cookie; 64 int ret; 65 66 _DIAGASSERT(fp != NULL); 67 _DIAGASSERT(buf != NULL); 68 if(fp == NULL) { 69 errno = EINVAL; 70 return (EOF); 71 } 72 73 ret = (int)read(fp->_file, buf, (size_t)n); 74 /* if the read succeeded, update the current offset */ 75 if (ret >= 0) 76 fp->_offset += ret; 77 else 78 fp->_flags &= ~__SOFF; /* paranoia */ 79 return (ret); 80 } 81 82 int 83 __swrite(void *cookie, char const *buf, int n) 84 { 85 FILE *fp = cookie; 86 87 _DIAGASSERT(cookie != NULL); 88 _DIAGASSERT(buf != NULL); 89 if(fp == NULL) { 90 errno = EINVAL; 91 return (EOF); 92 } 93 94 if (fp->_flags & __SAPP) 95 (void) lseek(fp->_file, (off_t)0, SEEK_END); 96 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 97 return (int)(write(fp->_file, (char *)buf, (size_t)n)); 98 } 99 100 fpos_t 101 __sseek(void *cookie, fpos_t offset, int whence) 102 { 103 FILE *fp = cookie; 104 off_t ret; 105 106 _DIAGASSERT(fp != NULL); 107 if(fp == NULL) { 108 errno = EINVAL; 109 return (EOF); 110 } 111 112 ret = lseek(fp->_file, (off_t)offset, whence); 113 if (ret == -1L) 114 fp->_flags &= ~__SOFF; 115 else { 116 fp->_flags |= __SOFF; 117 fp->_offset = ret; 118 } 119 return (ret); 120 } 121 122 int 123 __sclose(void *cookie) 124 { 125 126 _DIAGASSERT(cookie != NULL); 127 if(cookie == NULL) { 128 errno = EINVAL; 129 return (EOF); 130 } 131 132 return (close(((FILE *)cookie)->_file)); 133 } 134
