1 /* $NetBSD: stdio.c,v 1.20 2012/03/20 01:42:59 christos Exp $ */ 2 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 <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: stdio.c,v 1.20 2012/03/20 01:42:59 christos Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 46 #include <assert.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <stdio.h> 50 #include <unistd.h> 51 52 #include "reentrant.h" 53 #include "local.h" 54 55 /* 56 * Small standard I/O/seek/close functions. 57 * These maintain the `known seek offset' for seek optimisation. 58 */ 59 int 60 __sread(void *cookie, char *buf, int n) 61 { 62 FILE *fp = cookie; 63 ssize_t ret; 64 65 _DIAGASSERT(fp != NULL); 66 _DIAGASSERT(buf != NULL); 67 68 ret = read(__sfileno(fp), buf, (size_t)n); 69 /* if the read succeeded, update the current offset */ 70 if (ret >= 0) 71 fp->_offset += ret; 72 else 73 fp->_flags &= ~__SOFF; /* paranoia */ 74 75 return (int)ret; 76 } 77 78 int 79 __swrite(void *cookie, char const *buf, int n) 80 { 81 FILE *fp = cookie; 82 83 _DIAGASSERT(cookie != NULL); 84 _DIAGASSERT(buf != NULL); 85 86 if (fp->_flags & __SAPP) 87 (void) lseek(__sfileno(fp), (off_t)0, SEEK_END); 88 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 89 return (int)write(__sfileno(fp), buf, (size_t)n); 90 } 91 92 off_t 93 __sseek(void *cookie, off_t offset, int whence) 94 { 95 FILE *fp = cookie; 96 off_t ret; 97 98 _DIAGASSERT(fp != NULL); 99 100 ret = lseek(__sfileno(fp), offset, whence); 101 if (ret == -1L) 102 fp->_flags &= ~__SOFF; 103 else { 104 fp->_flags |= __SOFF; 105 fp->_offset = ret; 106 } 107 return ret; 108 } 109 110 int 111 __sclose(void *cookie) 112 { 113 114 _DIAGASSERT(cookie != NULL); 115 116 return close(__sfileno((FILE *)cookie)); 117 } 118