1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002-2004 Tim J. Robbins. 5 * All rights reserved. 6 * 7 * Copyright (c) 2011 The FreeBSD Foundation 8 * All rights reserved. 9 * Portions of this software were developed by David Chisnall 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "namespace.h" 38 #include <errno.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <wchar.h> 42 #include "un-namespace.h" 43 #include "libc_private.h" 44 #include "local.h" 45 #include "mblocal.h" 46 47 wchar_t * 48 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale) 49 { 50 int sret; 51 wchar_t *wsp, *ret; 52 size_t nconv; 53 const char *src; 54 unsigned char *nl; 55 FIX_LOCALE(locale); 56 struct xlocale_ctype *l = XLOCALE_CTYPE(locale); 57 58 FLOCKFILE_CANCELSAFE(fp); 59 ORIENT(fp, 1); 60 61 if (n <= 0) { 62 fp->_flags |= __SERR; 63 errno = EINVAL; 64 goto error; 65 } 66 67 wsp = ws; 68 if (n == 1) 69 goto ok; 70 71 if (fp->_r <= 0 && __srefill(fp)) 72 /* EOF or ferror */ 73 goto error; 74 75 sret = 0; 76 do { 77 src = fp->_p; 78 nl = memchr(fp->_p, '\n', fp->_r); 79 nconv = l->__mbsnrtowcs(wsp, &src, 80 nl != NULL ? (nl - fp->_p + 1) : fp->_r, 81 n - 1, &fp->_mbstate); 82 if (nconv == (size_t)-1) { 83 /* Conversion error */ 84 fp->_flags |= __SERR; 85 goto error; 86 } 87 if (src == NULL) { 88 /* 89 * We hit a null byte. Increment the character count, 90 * since mbsnrtowcs()'s return value doesn't include 91 * the terminating null, then resume conversion 92 * after the null. 93 */ 94 nconv++; 95 src = memchr(fp->_p, '\0', fp->_r); 96 src++; 97 } 98 fp->_r -= (unsigned char *)src - fp->_p; 99 fp->_p = (unsigned char *)src; 100 n -= nconv; 101 wsp += nconv; 102 } while ((wsp == ws || wsp[-1] != L'\n') && n > 1 && (fp->_r > 0 || 103 (sret = __srefill(fp)) == 0)); 104 if (sret && !__sfeof(fp)) 105 /* ferror */ 106 goto error; 107 if (!l->__mbsinit(&fp->_mbstate)) { 108 /* Incomplete character */ 109 fp->_flags |= __SERR; 110 errno = EILSEQ; 111 goto error; 112 } 113 if (wsp == ws) 114 /* EOF */ 115 goto error; 116 ok: 117 *wsp = L'\0'; 118 ret = ws; 119 end: 120 FUNLOCKFILE_CANCELSAFE(); 121 return (ret); 122 123 error: 124 ret = NULL; 125 goto end; 126 } 127 128 wchar_t * 129 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp) 130 { 131 return fgetws_l(ws, n, fp, __get_locale()); 132 } 133