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. 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 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char rcsid[] = "$OpenBSD: fopen.c,v 1.4 2004/09/28 18:12:44 otto Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <fcntl.h> 40 #include <stdio.h> 41 #include <errno.h> 42 #include "local.h" 43 44 FILE * 45 fopen(const char *file, const char *mode) 46 { 47 FILE *fp; 48 int f; 49 int flags, oflags; 50 51 if ((flags = __sflags(mode, &oflags)) == 0) 52 return (NULL); 53 if ((fp = __sfp()) == NULL) 54 return (NULL); 55 if ((f = open(file, oflags, DEFFILEMODE)) < 0) { 56 fp->_flags = 0; /* release */ 57 return (NULL); 58 } 59 fp->_file = f; 60 fp->_flags = flags; 61 fp->_cookie = fp; 62 fp->_read = __sread; 63 fp->_write = __swrite; 64 fp->_seek = __sseek; 65 fp->_close = __sclose; 66 67 /* 68 * When opening in append mode, even though we use O_APPEND, 69 * we need to seek to the end so that ftell() gets the right 70 * answer. If the user then alters the seek pointer, or 71 * the file extends, this will fail, but there is not much 72 * we can do about this. (We could set __SAPP and check in 73 * fseek and ftell.) 74 */ 75 if (oflags & O_APPEND) 76 (void) __sseek((void *)fp, (fpos_t)0, SEEK_END); 77 return (fp); 78 } 79