stdio/FreeBSD/fgetws.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/fgetws.c,v 1.8 2009/11/25 04:45:45 wollman Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include "namespace.h"
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <string.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 wchar_t *
  43 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t loc)
  44 {
  45         wchar_t *wsp;
  46         size_t nconv;
  47         const char *src;
  48         unsigned char *nl;
  49         struct __xlocale_st_runelocale *rl;
  50         size_t (*__mbsnrtowcs)(wchar_t * __restrict, const char ** __restrict, size_t, size_t, __darwin_mbstate_t * __restrict, locale_t);
  51
  52         NORMALIZE_LOCALE(loc);
  53         rl = loc->__lc_ctype;
  54         __mbsnrtowcs = rl->__mbsnrtowcs;
  55         FLOCKFILE(fp);
  56         ORIENT(fp, 1);
  57
  58         if (n <= 0) {
  59                 errno = EINVAL;
  60                 goto error;
  61         }
  62
  63         if (fp->_r <= 0 && __srefill(fp))
  64                 /* EOF */
  65                 goto error;
  66         wsp = ws;
  67         do {
  68                 src = (const char *)fp->_p;
  69                 nl = memchr(fp->_p, '\n', fp->_r);
  70                 nconv = __mbsnrtowcs(wsp, &src,
  71                     nl != NULL ? (nl - fp->_p + 1) : fp->_r,
  72                     n - 1, &fp->_mbstate, loc);
  73                 if (nconv == (size_t)-1)
  74                         /* Conversion error */
  75                         goto error;
  76                 if (src == NULL) {
  77                         /*
  78                          * We hit a null byte. Increment the character count,
  79                          * since mbsnrtowcs()'s return value doesn't include
  80                          * the terminating null, then resume conversion
  81                          * after the null.
  82                          */
  83                         nconv++;
  84                         src = memchr(fp->_p, '\0', fp->_r);
  85                         src++;
  86                 }
  87                 fp->_r -= (unsigned char *)src - fp->_p;
  88                 fp->_p = (unsigned char *)src;
  89                 n -= nconv;
  90                 wsp += nconv;
  91         } while (wsp[-1] != L'\n' && n > 1 && (fp->_r > 0 ||
  92             __srefill(fp) == 0));
  93         if (wsp == ws)
  94                 /* EOF */
  95                 goto error;
  96         if (!rl->__mbsinit(&fp->_mbstate, loc))
  97                 /* Incomplete character */
  98                 goto error;
  99         *wsp = L'\0';
 100         FUNLOCKFILE(fp);
 101
 102         return (ws);
 103
 104 error:
 105         FUNLOCKFILE(fp);
 106         return (NULL);
 107 }
 108
 109 wchar_t *
 110 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
 111 {
 112         return fgetws_l(ws, n, fp, __current_locale());
 113 }