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 1.5 2005/01/31 22:29:40 dillon Exp $ 39 */ 40 41 #include "namespace.h" 42 #include <fcntl.h> 43 #include <unistd.h> 44 #include <stdio.h> 45 #include "un-namespace.h" 46 #include "local.h" 47 48 /* 49 * Small standard I/O/seek/close functions. 50 * These maintain the `known seek offset' for seek optimisation. 51 */ 52 int 53 __sread(void *cookie, char *buf, int n) 54 { 55 FILE *fp = cookie; 56 int ret; 57 58 ret = _read(fp->_file, buf, (size_t)n); 59 /* if the read succeeded, update the current offset */ 60 if (ret >= 0) 61 fp->_offset += ret; 62 else 63 fp->_flags &= ~__SOFF; /* paranoia */ 64 return (ret); 65 } 66 67 int 68 __swrite(void *cookie, char const *buf, int n) 69 { 70 FILE *fp = cookie; 71 72 if (fp->_flags & __SAPP) 73 (void) lseek(fp->_file, (off_t)0, SEEK_END); 74 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 75 return (_write(fp->_file, buf, (size_t)n)); 76 } 77 78 fpos_t 79 __sseek(void *cookie, fpos_t offset, int whence) 80 { 81 FILE *fp = cookie; 82 off_t ret; 83 84 ret = lseek(fp->_file, (off_t)offset, whence); 85 if (ret == -1) 86 fp->_flags &= ~__SOFF; 87 else { 88 fp->_flags |= __SOFF; 89 fp->_offset = ret; 90 } 91 return (ret); 92 } 93 94 int 95 __sclose(void *cookie) 96 { 97 98 return (_close(((FILE *)cookie)->_file)); 99 } 100