stdio/FreeBSD/ungetwc.c

   1 /*-
   2  * Copyright (c) 2002-2004 Tim J. Robbins.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/stdio/ungetwc.c,v 1.11 2008/04/17 22:17:54 jhb Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include "namespace.h"
  33 #include <errno.h>
  34 #include <limits.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <wchar.h>
  38 #include "un-namespace.h"
  39 #include "libc_private.h"
  40 #include "local.h"
  41 #include "mblocal.h"
  42
  43 /*
  44  * Non-MT-safe version.
  45  */
  46 wint_t
  47 __ungetwc(wint_t wc, FILE *fp, locale_t loc)
  48 {
  49         char buf[MB_LEN_MAX];
  50         size_t len;
  51
  52         if (wc == WEOF)
  53                 return (WEOF);
  54         if ((len = loc->__lc_ctype->__wcrtomb(buf, wc, &fp->_mbstate, loc)) == (size_t)-1) {
  55                 fp->_flags |= __SERR;
  56                 return (WEOF);
  57         }
  58         while (len-- != 0)
  59                 if (__ungetc((unsigned char)buf[len], fp) == EOF)
  60                         return (WEOF);
  61
  62         return (wc);
  63 }
  64
  65 /*
  66  * MT-safe version.
  67  */
  68 wint_t
  69 ungetwc(wint_t wc, FILE *fp)
  70 {
  71         wint_t r;
  72
  73         FLOCKFILE(fp);
  74         ORIENT(fp, 1);
  75         r = __ungetwc(wc, fp, __current_locale());
  76         FUNLOCKFILE(fp);
  77
  78         return (r);
  79 }
  80
  81 wint_t
  82 ungetwc_l(wint_t wc, FILE *fp, locale_t loc)
  83 {
  84         wint_t r;
  85
  86         NORMALIZE_LOCALE(loc);
  87         FLOCKFILE(fp);
  88         ORIENT(fp, 1);
  89         r = __ungetwc(wc, fp, loc);
  90         FUNLOCKFILE(fp);
  91
  92         return (r);
  93 }