usr/src/lib/libc/port/locale/fgetws.c

   1 /*
   2  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2002-2004 Tim J. Robbins.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include "lint.h"
  29 #include "mse_int.h"
  30 #include "file64.h"
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <wchar.h>
  35 #include "mblocal.h"
  36 #include "mse.h"
  37 #include "stdiom.h"
  38 #include "libc.h"
  39
  40 /*
  41  * FreeBSD implementation here included a full version that tried to be more
  42  * efficient with memory strings.  However, for simplicity's sake, we are
  43  * going to just use fgetwc().
  44  */
  45
  46 wchar_t *
  47 _fgetws_impl(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp)
  48 {
  49         wint_t wc;
  50         wchar_t *wsp;
  51         rmutex_t *lk;
  52
  53         FLOCKFILE(lk, fp);
  54         if (GET_NO_MODE(fp))
  55                 _setorientation(fp, _WC_MODE);
  56
  57         if (n <= 0) {
  58                 errno = EINVAL;
  59                 FUNLOCKFILE(lk);
  60                 return (NULL);
  61         }
  62
  63         wsp = ws;
  64         while (--n) {
  65                 wc = _fgetwc_unlocked(fp);
  66                 if (wc == EOF) {
  67                         /*
  68                          * This can happen because of an EOF on
  69                          * the stream, or because of a decoding error.
  70                          * Its up to the caller to check errno.
  71                          */
  72                         if (wsp == ws) {
  73                                 /* EOF with no data read */
  74                                 FUNLOCKFILE(lk);
  75                                 return (NULL);
  76                         }
  77                         break;
  78                 }
  79                 *wsp++ = wc;
  80
  81                 if (wc == L'\n')
  82                         break;
  83         }
  84         *wsp = 0;
  85         FUNLOCKFILE(lk);
  86         return (ws);
  87 }
  88
  89 wchar_t *
  90 fgetws(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp)
  91 {
  92         return (_fgetws_impl(ws, n, fp));
  93 }
  94
  95 wchar_t *
  96 getws(wchar_t *ws)
  97 {
  98         wint_t wc;
  99         wchar_t *wsp;
 100         rmutex_t *lk;
 101
 102         FLOCKFILE(lk, stdin);
 103
 104         wsp = ws;
 105         for (;;) {
 106                 wc = _fgetwc_unlocked(stdin);
 107                 if (wc == EOF) {
 108                         /*
 109                          * This can happen because of an EOF on
 110                          * the stream, or because of a decoding error.
 111                          * Its up to the caller to check errno.
 112                          */
 113                         if (wsp == ws) {
 114                                 /* EOF with no data read */
 115                                 FUNLOCKFILE(lk);
 116                                 return (NULL);
 117                         }
 118                         break;
 119                 }
 120                 *wsp++ = wc;
 121
 122                 if (wc == L'\n')
 123                         break;
 124         }
 125         *wsp = 0;
 126         FUNLOCKFILE(lk);
 127         return (ws);
 128 }