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