fopen.c revision 82807
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 * $FreeBSD: head/lib/libc/stdio/fopen.c 82807 2001-09-02 19:10:10Z ache $ 37 */ 38 39#if defined(LIBC_SCCS) && !defined(lint) 40static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; 41#endif /* LIBC_SCCS and not lint */ 42 43#include "namespace.h" 44#include <sys/types.h> 45#include <sys/stat.h> 46#include <fcntl.h> 47#include <stdio.h> 48#include <errno.h> 49#include "un-namespace.h" 50 51#include "local.h" 52 53FILE * 54fopen(file, mode) 55 const char *file; 56 const char *mode; 57{ 58 FILE *fp; 59 int f; 60 int flags, oflags; 61 62 if ((flags = __sflags(mode, &oflags)) == 0) 63 return (NULL); 64 if ((fp = __sfp()) == NULL) 65 return (NULL); 66 if ((f = _open(file, oflags, DEFFILEMODE)) < 0) { 67 fp->_flags = 0; /* release */ 68 return (NULL); 69 } 70 fp->_file = f; 71 fp->_flags = flags; 72 fp->_flags |= __SOFF; 73 fp->_offset = 0; 74 fp->_cookie = fp; 75 fp->_read = __sread; 76 fp->_write = __swrite; 77 fp->_seek = __sseek; 78 fp->_close = __sclose; 79 /* 80 * When opening in append mode, even though we use O_APPEND, 81 * we need to seek to the end so that ftell() gets the right 82 * answer. If the user then alters the seek pointer, or 83 * the file extends, this will fail, but there is not much 84 * we can do about this. (We could set __SAPP and check in 85 * fseek and ftell.) 86 */ 87 if (oflags & O_APPEND) 88 (void)_sseek(fp, (fpos_t)0, SEEK_END); 89 return (fp); 90} 91