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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)stdio.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/stdio/stdio.c,v 1.9 2000/01/27 23:06:46 jasone Exp $ 38 * $DragonFly: src/lib/libc/stdio/stdio.c,v 1.4 2004/06/07 20:35:41 hmp Exp $ 39 */ 40 41 #include <fcntl.h> 42 #include <unistd.h> 43 #include <stdio.h> 44 #include "local.h" 45 46 /* 47 * Small standard I/O/seek/close functions. 48 * These maintain the `known seek offset' for seek optimisation. 49 */ 50 int 51 __sread(void *cookie, char *buf, int n) 52 { 53 FILE *fp = cookie; 54 int ret; 55 56 ret = _read(fp->_file, buf, (size_t)n); 57 /* if the read succeeded, update the current offset */ 58 if (ret >= 0) 59 fp->_offset += ret; 60 else 61 fp->_flags &= ~__SOFF; /* paranoia */ 62 return (ret); 63 } 64 65 int 66 __swrite(void *cookie, char const *buf, int n) 67 { 68 FILE *fp = cookie; 69 70 if (fp->_flags & __SAPP) 71 (void) lseek(fp->_file, (off_t)0, SEEK_END); 72 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 73 return (_write(fp->_file, buf, (size_t)n)); 74 } 75 76 fpos_t 77 __sseek(void *cookie, fpos_t offset, int whence) 78 { 79 FILE *fp = cookie; 80 off_t ret; 81 82 ret = lseek(fp->_file, (off_t)offset, whence); 83 if (ret == -1) 84 fp->_flags &= ~__SOFF; 85 else { 86 fp->_flags |= __SOFF; 87 fp->_offset = ret; 88 } 89 return (ret); 90 } 91 92 int 93 __sclose(void *cookie) 94 { 95 96 return (_close(((FILE *)cookie)->_file)); 97 } 98