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().  We also do the stream orientation thing for
  44  * XPG5 if we need to.
  45  */
  46
  47 wchar_t *
  48 _fgetws_impl(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp,
  49     int orient)
  50 {
  51         wint_t wc;
  52         wchar_t *wsp;
  53         rmutex_t *lk;
  54
  55         FLOCKFILE(lk, fp);
  56         if (orient && GET_NO_MODE(fp))
  57                 _setorientation(fp, _WC_MODE);
  58
  59         if (n <= 0) {
  60                 errno = EINVAL;
  61                 FUNLOCKFILE(lk);
  62                 return (NULL);
  63         }
  64
  65         wsp = ws;
  66         while (--n) {
  67                 wc = _fgetwc_unlocked(fp);
  68                 if (wc == EOF) {
  69                         /*
  70                          * This can happen because of an EOF on
  71                          * the stream, or because of a decoding error.
  72                          * Its up to the caller to check errno.
  73                          */
  74                         if (wsp == ws) {
  75                                 /* EOF with no data read */
  76                                 FUNLOCKFILE(lk);
  77                                 return (NULL);
  78                         }
  79                         break;
  80                 }
  81                 *wsp++ = wc;
  82
  83                 if (wc == L'\n')
  84                         break;
  85         }
  86         *wsp = 0;
  87         FUNLOCKFILE(lk);
  88         return (ws);
  89 }
  90
  91 wchar_t *
  92 fgetws(wchar_t *_RESTRICT_KYWD ws, int n, FILE *_RESTRICT_KYWD fp)
  93 {
  94         return (_fgetws_impl(ws, n, fp, 0));
  95 }
  96
  97 wchar_t *
  98 __fgetws_xpg5(wchar_t *ws, int n, FILE *fp)
  99 {
 100         return (_fgetws_impl(ws, n, fp, 1));
 101 }
 102
 103 wchar_t *
 104 getws(wchar_t *ws)
 105 {
 106         wint_t wc;
 107         wchar_t *wsp;
 108         rmutex_t *lk;
 109
 110         FLOCKFILE(lk, stdin);
 111
 112         wsp = ws;
 113         for (;;) {
 114                 wc = _fgetwc_unlocked(stdin);
 115                 if (wc == EOF) {
 116                         /*
 117                          * This can happen because of an EOF on
 118                          * the stream, or because of a decoding error.
 119                          * Its up to the caller to check errno.
 120                          */
 121                         if (wsp == ws) {
 122                                 /* EOF with no data read */
 123                                 FUNLOCKFILE(lk);
 124                                 return (NULL);
 125                         }
 126                         break;
 127                 }
 128                 *wsp++ = wc;
 129
 130                 if (wc == L'\n')
 131                         break;
 132         }
 133         *wsp = 0;
 134         FUNLOCKFILE(lk);
 135         return (ws);
 136 }