1 /* $NetBSD: fopen.c,v 1.4 1995/02/02 02:09:23 jtc Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #if defined(LIBC_SCCS) && !defined(lint) 40 #if 0 41 static char sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93"; 42 #endif 43 static char rcsid[] = "$NetBSD: fopen.c,v 1.4 1995/02/02 02:09:23 jtc Exp $"; 44 #endif /* LIBC_SCCS and not lint */ 45 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 #include <fcntl.h> 49 #include <stdio.h> 50 #include <errno.h> 51 #include "local.h" 52 53 FILE * 54 fopen(file, mode) 55 const char *file; 56 const char *mode; 57 { 58 register FILE *fp; 59 register 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->_cookie = fp; 73 fp->_read = __sread; 74 fp->_write = __swrite; 75 fp->_seek = __sseek; 76 fp->_close = __sclose; 77 78 /* 79 * When opening in append mode, even though we use O_APPEND, 80 * we need to seek to the end so that ftell() gets the right 81 * answer. If the user then alters the seek pointer, or 82 * the file extends, this will fail, but there is not much 83 * we can do about this. (We could set __SAPP and check in 84 * fseek and ftell.) 85 */ 86 if (oflags & O_APPEND) 87 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 88 return (fp); 89 } 90