EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

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

/*-\r
 * Copyright (c)2001 Citrus Project,\r
 * All rights reserved.\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
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
 * $Citrus$\r
\r
  NetBSD: ungetwc.c,v 1.3 2005/06/12 05:21:27 lukem Exp\r
 */\r
#include  <LibConfig.h>\r
#include  <sys/EfiCdefs.h>\r
\r
#include  <assert.h>\r
#include  <errno.h>\r
#include  <stdio.h>\r
#include  <wchar.h>\r
#include  "reentrant.h"\r
#include  "local.h"\r
\r
wint_t\r
ungetwc(wint_t wc, FILE *fp)\r
{\r
  struct wchar_io_data *wcio;\r
\r
  _DIAGASSERT(fp);\r
\r
  if (wc == WEOF)\r
    return WEOF;\r
\r
  FLOCKFILE(fp);\r
  _SET_ORIENTATION(fp, 1);\r
  /*\r
   * XXX since we have no way to transform a wchar string to\r
   * a char string in reverse order, we can't use ungetc.\r
   */\r
  /* XXX should we flush ungetc buffer? */\r
\r
  wcio = WCIO_GET(fp);\r
  if (wcio == 0) {\r
    FUNLOCKFILE(fp);\r
    errno = ENOMEM; /* XXX */\r
    return WEOF;\r
  }\r
\r
  if (wcio->wcio_ungetwc_inbuf >= WCIO_UNGETWC_BUFSIZE) {\r
    FUNLOCKFILE(fp);\r
    return WEOF;\r
  }\r
\r
  wcio->wcio_ungetwc_buf[wcio->wcio_ungetwc_inbuf++] = (wchar_t)wc;\r
  __sclearerr(fp);\r
  FUNLOCKFILE(fp);\r
\r
  return wc;\r
}\r