author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Wed, 13 Oct 2010 16:27:53 +0300 | |
branch | RCL_3 |
changeset 75 | 254b651f304e |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
0
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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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* 4. 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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* © Portions copyright (c) 2005 - 2006 Nokia Corporation. All rights reserved. |
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*/ |
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|
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#if defined(LIBC_SCCS) && !defined(lint) |
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static char sccsid[] = "@(#)freopen.c 8.1 (Berkeley) 6/4/93"; |
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#endif /* LIBC_SCCS and not lint */ |
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#include <sys/cdefs.h> |
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#ifndef __SYMBIAN32__ |
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__FBSDID("$FreeBSD: src/lib/libc/stdio/freopen.c,v 1.13 2004/05/22 15:19:41 tjr Exp $"); |
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#endif |
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#include "namespace.h" |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <wchar.h> |
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#ifndef DEFFILEMODE |
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#define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH) |
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#endif |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "un-namespace.h" |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include "libc_private.h" |
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#include "local.h" |
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#include "common_def.h" |
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#if (defined(__SYMBIAN32__) && (defined(__WINSCW__) || defined(__WINS__))) |
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#include "libc_wsd_defs.h" |
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#endif |
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#ifdef EMULATOR |
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int *GET_WSD_VAR_NAME(__sdidinit, g)(); |
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#define __sdidinit (*GET_WSD_VAR_NAME(__sdidinit, g)()) |
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#endif //EMULATOR |
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/* |
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Re-direct an existing, open (probably) file to some other file. |
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ANSI is written such that the original file gets closed if at |
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all possible, no matter what. |
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*/ |
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|
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EXPORT_C FILE * wfreopen(const wchar_t * file, const wchar_t * mode, FILE *fp) |
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{ |
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int f; |
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int dflags, flags, isopen, oflags, sverrno, wantfd; |
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char destmode[4]; |
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size_t siz; |
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|
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destmode[0] = '\0'; |
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if(mode==NULL) |
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{ |
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errno = EINVAL; |
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(void) fclose(fp); |
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return (NULL); |
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} |
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siz = wcstombs(destmode, mode, 4); |
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|
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|
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if ((flags = __sflags(destmode, &oflags)) == 0) { |
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(void) fclose(fp); |
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return (NULL); |
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} |
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|
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FLOCKFILE(fp); |
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if (!__sdidinit) |
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__sinit(); |
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|
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/* |
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* If the filename is a NULL pointer, the caller is asking us to |
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* re-open the same file with a different mode. We allow this only |
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* if the modes are compatible. |
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102 |
*/ |
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|
103 |
if (file == NULL) { |
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|
104 |
/* See comment below regarding freopen() of closed files. */ |
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|
105 |
if (fp->_flags == 0) { |
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|
106 |
FUNLOCKFILE(fp); |
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107 |
errno = EINVAL; |
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108 |
return (NULL); |
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109 |
} |
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110 |
if ((dflags = _fcntl(fp->_file, F_GETFL)) < 0) { |
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|
111 |
sverrno = errno; |
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112 |
fclose(fp); |
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113 |
FUNLOCKFILE(fp); |
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114 |
errno = sverrno; |
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115 |
return (NULL); |
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116 |
} |
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117 |
if ((dflags & O_ACCMODE) != O_RDWR && (dflags & O_ACCMODE) != |
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118 |
(oflags & O_ACCMODE)) { |
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119 |
fclose(fp); |
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120 |
FUNLOCKFILE(fp); |
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121 |
errno = EINVAL; |
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122 |
return (NULL); |
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123 |
} |
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124 |
if ((oflags ^ dflags) & O_APPEND) { |
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125 |
dflags &= ~O_APPEND; |
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126 |
dflags |= oflags & O_APPEND; |
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127 |
if (_fcntl(fp->_file, F_SETFL, dflags) < 0) { |
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128 |
sverrno = errno; |
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129 |
fclose(fp); |
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130 |
FUNLOCKFILE(fp); |
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131 |
errno = sverrno; |
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132 |
return (NULL); |
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133 |
} |
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134 |
} |
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135 |
if (oflags & O_TRUNC) |
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136 |
ftruncate(fp->_file, 0); |
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137 |
if (_fseeko(fp, 0, oflags & O_APPEND ? SEEK_END : SEEK_SET, |
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|
138 |
0) < 0 && errno != ESPIPE) { |
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|
139 |
sverrno = errno; |
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140 |
fclose(fp); |
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141 |
FUNLOCKFILE(fp); |
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142 |
errno = sverrno; |
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143 |
return (NULL); |
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144 |
} |
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145 |
f = fp->_file; |
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146 |
isopen = 0; |
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147 |
wantfd = -1; |
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148 |
|
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149 |
} |
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150 |
else |
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151 |
{ |
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152 |
/* |
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153 |
* There are actually programs that depend on being able to "freopen" |
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154 |
* descriptors that weren't originally open. Keep this from breaking. |
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155 |
* Remember whether the stream was open to begin with, and which file |
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156 |
* descriptor (if any) was associated with it. If it was attached to |
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157 |
* a descriptor, defer closing it; freopen("/dev/stdin", "r", stdin) |
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158 |
* should work. This is unnecessary if it was not a Unix file. |
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159 |
*/ |
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160 |
if (fp->_flags == 0) { |
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161 |
fp->_flags = __SEOF; /* hold on to it */ |
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162 |
isopen = 0; |
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163 |
wantfd = -1; |
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164 |
} |
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165 |
else { |
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166 |
/* flush the stream; ANSI doesn't require this. */ |
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167 |
if (fp->_flags & __SWR) |
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168 |
(void) __sflush(fp); |
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169 |
/* if close is NULL, closing is a no-op, hence pointless */ |
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170 |
isopen = fp->_close != NULL; |
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171 |
if ((wantfd = fp->_file) < 0 && isopen) { |
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172 |
(void) (*fp->_close)(fp->_cookie); |
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173 |
isopen = 0; |
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174 |
} |
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175 |
} |
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176 |
/* Get a new descriptor to refer to the new file. */ |
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177 |
f = wopen(file, oflags, DEFFILEMODE); |
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178 |
if (f < 0 && isopen) { |
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179 |
/* If out of fd's close the old one and try again. */ |
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180 |
if (errno == ENFILE || errno == EMFILE) { |
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181 |
(void) (*fp->_close)(fp->_cookie); |
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182 |
isopen = 0; |
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183 |
f = wopen(file, oflags, DEFFILEMODE); |
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184 |
} |
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185 |
} |
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186 |
sverrno = errno; |
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187 |
} |
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188 |
|
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189 |
/* |
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190 |
* Finish closing fp. Even if the open succeeded above, we cannot |
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191 |
* keep fp->_base: it may be the wrong size. This loses the effect |
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192 |
* of any setbuffer calls, but stdio has always done this before. |
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193 |
*/ |
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194 |
if (isopen) |
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195 |
(void) (*fp->_close)(fp->_cookie); |
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196 |
if (fp->_flags & __SMBF) |
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197 |
{ |
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198 |
#ifdef __SYMBIAN32__ |
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199 |
BackendFree((char *)fp->_bf._base); |
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200 |
#else |
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201 |
free((char *)fp->_bf._base); |
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202 |
#endif//__SYMBIAN32__ |
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203 |
} |
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204 |
|
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205 |
fp->_w = 0; |
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206 |
fp->_r = 0; |
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fp->_p = NULL; |
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fp->_bf._base = NULL; |
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fp->_bf._size = 0; |
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fp->_lbfsize = 0; |
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if (HASUB(fp)) |
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FREEUB(fp); |
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fp->_ub._size = 0; |
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if (HASLB(fp)) |
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FREELB(fp); |
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fp->_lb._size = 0; |
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fp->_extra->orientation = 0; |
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memset(&fp->_extra->mbstate, 0, sizeof(mbstate_t)); |
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|
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if (f < 0) { /* did not get it after all */ |
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fp->_flags = 0; /* set it free */ |
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errno = sverrno; /* restore in case _close clobbered */ |
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FUNLOCKFILE(fp); |
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return (NULL); |
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} |
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#ifndef __SYMBIAN32__ |
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/* |
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* If reopening something that was open before on a real file, try |
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* to maintain the descriptor. Various C library routines (perror) |
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* assume stderr is always fd STDERR_FILENO, even if being freopen'd. |
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*/ |
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if (wantfd >= 0 && f != wantfd) { |
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if (dup2(f, wantfd) >= 0) { |
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(void)_close(f); |
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f = wantfd; |
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} |
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} |
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#else |
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if (wantfd >= 0 && f > wantfd){ |
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if (dup2(f, wantfd) >= 0) { |
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(void)_close(f); |
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f = wantfd; |
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} |
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} |
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#endif |
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|
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fp->_flags = flags; |
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fp->_file = f; |
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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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#ifdef __SYMBIAN32__ |
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if (oflags & O_TEXT) { |
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fp->_extra->fmode = 't'; |
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} |
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else { |
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fp->_extra->fmode = 'b'; |
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} |
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#endif |
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FUNLOCKFILE(fp); |
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return (fp); |
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} |