1 /*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: head/lib/libc/stdio/fgetws.c 227753 2011-11-20 14:45:42Z theraven $ 32 */ 33 34 35 #include "namespace.h" 36 #include <errno.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <wchar.h> 40 #include "un-namespace.h" 41 #include "libc_private.h" 42 #include "local.h" 43 #include "mblocal.h" 44 45 wchar_t * 46 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale) 47 { 48 struct wchar_io_data *wcio; 49 mbstate_t *st; 50 wchar_t *wsp; 51 size_t nconv; 52 const char *src; 53 unsigned char *nl; 54 FIX_LOCALE(locale); 55 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 56 57 FLOCKFILE(fp); 58 ORIENT(fp, 1); 59 wcio = WCIO_GET(fp); 60 if (wcio == NULL) { 61 errno = ENOMEM; 62 goto error; 63 } 64 65 if (n <= 0) { 66 errno = EINVAL; 67 goto error; 68 } 69 70 wcio->wcio_ungetwc_inbuf = 0; 71 st = &wcio->wcio_mbstate_out; 72 73 if (fp->pub._r <= 0 && __srefill(fp)) 74 /* EOF */ 75 goto error; 76 wsp = ws; 77 do { 78 src = fp->pub._p; 79 nl = memchr(fp->pub._p, '\n', fp->pub._r); 80 nconv = l->__mbsnrtowcs(wsp, &src, 81 nl != NULL ? (nl - fp->pub._p + 1) : 82 fp->pub._r, n - 1, st); 83 if (nconv == (size_t)-1) 84 /* Conversion error */ 85 goto error; 86 if (src == NULL) { 87 /* 88 * We hit a null byte. Increment the character count, 89 * since mbsnrtowcs()'s return value doesn't include 90 * the terminating null, then resume conversion 91 * after the null. 92 */ 93 nconv++; 94 src = memchr(fp->pub._p, '\0', fp->pub._r); 95 src++; 96 } 97 fp->pub._r -= (unsigned char *)src - fp->pub._p; 98 fp->pub._p = (unsigned char *)src; 99 n -= nconv; 100 wsp += nconv; 101 } while (wsp[-1] != L'\n' && n > 1 && (fp->pub._r > 0 || 102 __srefill(fp) == 0)); 103 if (wsp == ws) 104 /* EOF */ 105 goto error; 106 if (!l->__mbsinit(st)) 107 /* Incomplete character */ 108 goto error; 109 *wsp = L'\0'; 110 FUNLOCKFILE(fp); 111 112 return (ws); 113 114 error: 115 FUNLOCKFILE(fp); 116 return (NULL); 117 } 118 wchar_t * 119 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp) 120 { 121 return fgetws_l(ws, n, fp, __get_locale()); 122 } 123