stdio/ungetwc-fbsd.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 1.9 2004/07/20 08:27:27 tjr Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include "namespace.h"
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <wchar.h>
  37 #include "un-namespace.h"
  38 #include "libc_private.h"
  39 #include "local.h"
  40 #include "mblocal.h"
  41
  42 /*
  43  * Non-MT-safe version.
  44  */
  45 wint_t
  46 __ungetwc(wint_t wc, FILE *fp, locale_t loc)
  47 {
  48         char buf[MB_LEN_MAX];
  49         size_t len;
  50
  51         if (wc == WEOF)
  52                 return (WEOF);
  53         if ((len = loc->__lc_ctype->__wcrtomb(buf, wc, &fp->_extra->mbstate, loc)) == (size_t)-1) {
  54                 fp->_flags |= __SERR;
  55                 return (WEOF);
  56         }
  57         while (len-- != 0)
  58                 if (__ungetc((unsigned char)buf[len], fp) == EOF)
  59                         return (WEOF);
  60
  61         return (wc);
  62 }
  63
  64 /*
  65  * MT-safe version.
  66  */
  67 wint_t
  68 ungetwc(wint_t wc, FILE *fp)
  69 {
  70         wint_t r;
  71
  72         FLOCKFILE(fp);
  73         ORIENT(fp, 1);
  74         r = __ungetwc(wc, fp, __current_locale());
  75         FUNLOCKFILE(fp);
  76
  77         return (r);
  78 }
  79
  80 wint_t
  81 ungetwc_l(wint_t wc, FILE *fp, locale_t loc)
  82 {
  83         wint_t r;
  84
  85         NORMALIZE_LOCALE(loc);
  86         FLOCKFILE(fp);
  87         ORIENT(fp, 1);
  88         r = __ungetwc(wc, fp, loc);
  89         FUNLOCKFILE(fp);
  90
  91         return (r);
  92 }