Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Stdio / wsetup.c

/*  $NetBSD: wsetup.c,v 1.11 2003/08/07 16:43:35 agc Exp $  */\r
\r
/*-\r
 * Copyright (c) 1990, 1993\r
 *  The Regents of the University of California.  All rights reserved.\r
 *\r
 * This code is derived from software contributed to Berkeley by\r
 * Chris Torek.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 */\r
#include  <LibConfig.h>\r
#include <sys/EfiCdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
#if 0\r
static char sccsid[] = "@(#)wsetup.c  8.1 (Berkeley) 6/4/93";\r
#else\r
__RCSID("$NetBSD: wsetup.c,v 1.11 2003/08/07 16:43:35 agc Exp $");\r
#endif\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include <assert.h>\r
#include <errno.h>\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include "reentrant.h"\r
#include "local.h"\r
\r
/*\r
 * Various output routines call wsetup to be sure it is safe to write,\r
 * because either _flags does not include __SWR, or _buf is NULL.\r
 * _wsetup returns 0 if OK to write, nonzero otherwise.\r
 */\r
int\r
__swsetup(FILE *fp)\r
{\r
\r
  _DIAGASSERT(fp != NULL);\r
\r
  /* make sure stdio is set up */\r
  if (!__sdidinit)\r
    __sinit();\r
\r
  /*\r
   * If we are not writing, we had better be reading and writing.\r
   */\r
  if ((fp->_flags & __SWR) == 0) {\r
    if ((fp->_flags & __SRW) == 0)\r
      return (EOF);\r
    if (fp->_flags & __SRD) {\r
      /* clobber any ungetc data */\r
      if (HASUB(fp))\r
        FREEUB(fp);\r
      fp->_flags &= ~(__SRD|__SEOF);\r
      fp->_r = 0;\r
      fp->_p = fp->_bf._base;\r
    }\r
    fp->_flags |= __SWR;\r
  }\r
\r
  /*\r
   * Make a buffer if necessary, then set _w.\r
   */\r
  if (fp->_bf._base == NULL)\r
    __smakebuf(fp);\r
  if (fp->_flags & __SLBF) {\r
    /*\r
     * It is line buffered, so make _lbfsize be -_bufsize\r
     * for the putc() macro.  We will change _lbfsize back\r
     * to 0 whenever we turn off __SWR.\r
     */\r
    fp->_w = 0;\r
    fp->_lbfsize = -fp->_bf._size;\r
  } else\r
    fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;\r
  return (0);\r
}\r