genericopenlibs/cstdlib/LSTDIO/FDOPEN.C
changeset 0 e4d67989cc36
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/genericopenlibs/cstdlib/LSTDIO/FDOPEN.C	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,144 @@
+/*
+* Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:
+* FUNCTION
+* <<fdopen>>---turn open file into a stream
+* INDEX
+* fdopen
+* INDEX
+* _fdopen_r
+* ANSI_SYNOPSIS
+* #include <stdio.h>
+* FILE *fdopen(int <[fd]>, const char *<[mode]>);
+* FILE *_fdopen_r(void *<[reent]>,
+* int <[fd]>, const char *<[mode]>);
+* TRAD_SYNOPSIS
+* #include <stdio.h>
+* FILE *fdopen(<[fd]>, <[mode]>)
+* int <[fd]>;
+* char *<[mode]>;
+* FILE *_fdopen_r(<[reent]>, <[fd]>, <[mode]>)
+* char *<[reent]>;
+* int <[fd]>;
+* char *<[mode]>);
+* <<fdopen>> produces a file descriptor of type <<FILE *>>, from a
+* descriptor for an already-open file (returned, for example, by the
+* system subroutine <<open>> rather than by <<fopen>>).
+* The <[mode]> argument has the same meanings as in <<fopen>>.
+* RETURNS
+* File pointer or <<NULL>>, as for <<fopen>>.
+* PORTABILITY
+* <<fdopen>> is ANSI.
+* 
+*
+*/
+
+
+
+#include <sys/types.h>
+
+#include <stdlib_r.h>
+#include <stdio_r.h>
+#include <errno.h>
+#include "LOCAL.H"
+
+
+#define MaxFullName 255
+/**
+A reentrant version of fdopen().
+*/
+EXPORT_C FILE * _fdopen_r (struct _reent *ptr, int fd, const char *mode)
+	{
+	wchar_t _wmode[MaxFullName+1];
+
+	if (-1 != mbstowcs(_wmode, mode, MaxFullName))
+		return _wfdopen_r(ptr, fd, _wmode);
+
+	ptr->_errno = EILSEQ;
+	return NULL;
+
+	}
+/**
+A reentrant version of wfdopen().
+*/
+EXPORT_C FILE * _wfdopen_r (struct _reent *ptr, int fd, const wchar_t *mode)
+{
+  register FILE *fp;
+  int flags, oflags;
+
+  if ((flags = __sflags (ptr, mode, &oflags)) == 0)
+    return 0;
+
+  /* make sure the mode the user wants is a subset of the actual mode */
+#ifdef F_GETFL
+  if ((fdflags = _fcntl (fd, F_GETFL, 0)) < 0)
+    return 0;
+  fdmode = fdflags & O_ACCMODE;
+  if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE)))
+    {
+      ptr->_errno = EBADF;
+      return 0;
+    }
+#endif
+
+  if ((fp = __sfp (ptr)) == 0)
+    return 0;
+  fp->_flags = (short)flags;
+  /*
+   * If opened for appending, but underlying descriptor
+   * does not have O_APPEND bit set, assert __SAPP so that
+   * __swrite() will lseek to end before each write.
+   */
+#ifdef F_GETFL
+  if ((oflags & O_APPEND) && !(fdflags & O_APPEND))
+#endif
+    fp->_flags |= __SAPP;
+  fp->_file = (short)fd;
+  fp->_cookie = (void*) fp;
+
+#undef _read
+#undef _write
+#undef _seek
+#undef _close
+
+  fp->_read = __sread;
+  fp->_write = __swrite;
+  fp->_seek = __sseek;
+  fp->_close = __sclose;
+  return fp;
+}
+
+#ifndef _REENT_ONLY
+/**
+This function associates a stream with an open file descriptor. 
+A stream is a pointer to a FILE structure that contains information about a file.
+A stream permits user-controlled buffering and formatted input and output.
+@return a FILE pointer to the control block for the new stream.
+@param fd The open file descriptor on which to open a stream.
+@param mode The access mode for the stream. 
+*/
+EXPORT_C FILE * fdopen (int fd, const char *mode)
+{
+  return _fdopen_r (_REENT, fd, mode);
+}
+
+/**
+A wide-character version of fdopen()
+*/
+EXPORT_C FILE * wfdopen (int fd, const wchar_t *mode)
+{
+  return _wfdopen_r (_REENT, fd, mode);
+}
+
+#endif