| Vishal Bhoj | 82c8071 | 2015-12-15 21:13:33 +0530 | [diff] [blame^] | 1 | /** @file
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| 2 | Implementation of fopen as declared in <stdio.h>.
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| 3 |
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| 4 | Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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| 5 | This program and the accompanying materials are licensed and made available
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| 6 | under the terms and conditions of the BSD License that accompanies this
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| 7 | distribution. The full text of the license may be found at
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| 8 | http://opensource.org/licenses/bsd-license.php.
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| 9 |
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| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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| 12 |
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| 13 | Copyright (c) 1990, 1993
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| 14 | The Regents of the University of California. All rights reserved.
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| 15 |
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| 16 | This code is derived from software contributed to Berkeley by
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| 17 | Chris Torek.
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| 18 |
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| 19 | Redistribution and use in source and binary forms, with or without
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| 20 | modification, are permitted provided that the following conditions
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| 21 | are met:
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| 22 | - Redistributions of source code must retain the above copyright
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| 23 | notice, this list of conditions and the following disclaimer.
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| 24 | - Redistributions in binary form must reproduce the above copyright
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| 25 | notice, this list of conditions and the following disclaimer in the
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| 26 | documentation and/or other materials provided with the distribution.
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| 27 | - Neither the name of the University nor the names of its contributors
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| 28 | may be used to endorse or promote products derived from this software
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| 29 | without specific prior written permission.
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| 30 |
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| 31 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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| 32 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 33 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 34 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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| 35 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 36 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 37 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 38 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 39 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 40 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 41 | POSSIBILITY OF SUCH DAMAGE.
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| 42 |
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| 43 | NetBSD: fopen.c,v 1.12 2003/08/07 16:43:24 agc Exp
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| 44 | fopen.c 8.1 (Berkeley) 6/4/93"
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| 45 | **/
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| 46 | #include <LibConfig.h>
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| 47 | #include <sys/EfiCdefs.h>
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| 48 |
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| 49 | #include <sys/types.h>
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| 50 | #include <sys/stat.h>
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| 51 | #include <assert.h>
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| 52 | #include <fcntl.h>
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| 53 | #include <stdio.h>
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| 54 | #include <errno.h>
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| 55 | #include <unistd.h>
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| 56 | #include "reentrant.h"
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| 57 | #include "local.h"
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| 58 |
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| 59 | FILE *
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| 60 | fopen(const char *file, const char *mode)
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| 61 | {
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| 62 | FILE *fp;
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| 63 | int f;
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| 64 | int flags, oflags;
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| 65 |
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| 66 | _DIAGASSERT(file != NULL);
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| 67 | if ((flags = __sflags(mode, &oflags)) == 0)
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| 68 | return (NULL);
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| 69 | if ((fp = __sfp()) == NULL)
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| 70 | return (NULL);
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| 71 | if ((f = open(file, oflags, DEFFILEMODE)) < 0)
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| 72 | goto release;
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| 73 | if (oflags & O_NONBLOCK) {
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| 74 | struct stat st;
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| 75 | if (fstat(f, &st) == -1) {
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| 76 | int sverrno = errno;
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| 77 | (void)close(f);
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| 78 | errno = sverrno;
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| 79 | goto release;
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| 80 | }
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| 81 | if (!S_ISREG(st.st_mode)) {
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| 82 | (void)close(f);
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| 83 | errno = EFTYPE;
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| 84 | goto release;
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| 85 | }
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| 86 | }
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| 87 | fp->_file = (short)f;
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| 88 | fp->_flags = (unsigned short)flags;
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| 89 | fp->_cookie = fp;
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| 90 | fp->_read = __sread;
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| 91 | fp->_write = __swrite;
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| 92 | fp->_seek = __sseek;
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| 93 | fp->_close = __sclose;
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| 94 |
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| 95 | /*
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| 96 | * When opening in append mode, even though we use O_APPEND,
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| 97 | * we need to seek to the end so that ftell() gets the right
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| 98 | * answer. If the user then alters the seek pointer, or
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| 99 | * the file extends, this will fail, but there is not much
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| 100 | * we can do about this. (We could set __SAPP and check in
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| 101 | * fseek and ftell.)
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| 102 | */
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| 103 | if (oflags & O_APPEND)
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| 104 | (void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
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| 105 | return (fp);
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| 106 | release:
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| 107 | fp->_flags = 0; /* release */
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| 108 | return (NULL);
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| 109 | }
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