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/* $OpenBSD: fopen.c,v 1.9 2016/09/21 04:38:56 guenther Exp $ */ |
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Chris Torek. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <limits.h> |
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#include <stdio.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include "local.h" |
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FILE * |
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fopen(const char *file, const char *mode) |
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{ |
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FILE *fp; |
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int f; |
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int flags, oflags; |
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✗✓ |
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if ((flags = __sflags(mode, &oflags)) == 0) |
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return (NULL); |
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✗✓ |
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if ((fp = __sfp()) == NULL) |
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return (NULL); |
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✗✓ |
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if ((f = open(file, oflags, DEFFILEMODE)) < 0) { |
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fp->_flags = 0; /* release */ |
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return (NULL); |
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} |
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/* _file is only a short */ |
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✗✓ |
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if (f > SHRT_MAX) { |
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fp->_flags = 0; /* release */ |
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close(f); |
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errno = EMFILE; |
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return (NULL); |
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} |
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fp->_file = f; |
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fp->_flags = flags; |
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fp->_cookie = fp; |
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fp->_read = __sread; |
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fp->_write = __swrite; |
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fp->_seek = __sseek; |
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fp->_close = __sclose; |
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/* |
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* When opening in append mode, even though we use O_APPEND, |
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* we need to seek to the end so that ftell() gets the right |
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* answer. If the user then alters the seek pointer, or |
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* the file extends, this will fail, but there is not much |
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* we can do about this. (We could set __SAPP and check in |
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* fseek and ftell.) |
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*/ |
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✗✓ |
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if (oflags & O_APPEND) |
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(void) __sseek(fp, 0, SEEK_END); |
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return (fp); |
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} |
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DEF_STRONG(fopen); |