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 * 4. 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 * @(#)fopen.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/fopen.c,v 1.14 2008/04/22 17:03:32 jhb Exp $ 34 * $DragonFly: src/lib/libc/stdio/fopen.c,v 1.6 2005/11/20 11:07:30 swildner Exp $ 35 */ 36 37 #include "namespace.h" 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <errno.h> 43 #include "un-namespace.h" 44 45 #include "local.h" 46 #include "priv_stdio.h" 47 48 FILE * 49 fopen(const char * __restrict file, const char * __restrict mode) 50 { 51 FILE *fp; 52 int f; 53 int flags, oflags; 54 55 if ((flags = __sflags(mode, &oflags)) == 0) 56 return (NULL); 57 if ((fp = __sfp()) == NULL) 58 return (NULL); 59 if ((f = _open(file, oflags, DEFFILEMODE)) < 0) { 60 fp->pub._flags = 0; /* release */ 61 return (NULL); 62 } 63 fp->pub._fileno = f; 64 fp->pub._flags = flags; 65 fp->_cookie = fp; 66 fp->_read = __sread; 67 fp->_write = __swrite; 68 fp->_seek = __sseek; 69 fp->_close = __sclose; 70 /* 71 * When opening in append mode, even though we use O_APPEND, 72 * we need to seek to the end so that ftell() gets the right 73 * answer. If the user then alters the seek pointer, or 74 * the file extends, this will fail, but there is not much 75 * we can do about this. (We could set __SAPP and check in 76 * fseek and ftell.) 77 */ 78 if (oflags & O_APPEND) 79 _sseek(fp, (fpos_t)0, SEEK_END); 80 return (fp); 81 } 82