a27a4b3690
mbstate_t object that they ignore. The zeroing is fairly expensive, and it will never be necessary in these functions; when we support state-dependent encodings, we will pass in a pointer to the file's mbstate_t object, and only zero it at the time the file gets opened.
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*-
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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "local.h"
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static __inline wint_t __fgetwc_nbf(FILE *);
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/*
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* Non-MT-safe version.
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*/
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wint_t
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__fgetwc(FILE *fp)
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{
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wint_t wc;
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if (MB_CUR_MAX == 1) {
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/*
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* Assume we're using a single-byte locale. A safer test
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* might be to check _CurrentRuneLocale->encoding.
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*/
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wc = (wint_t)__sgetc(fp);
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} else
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wc = __fgetwc_nbf(fp);
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return (wc);
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}
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/*
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* MT-safe version.
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*/
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wint_t
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fgetwc(FILE *fp)
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{
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wint_t r;
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FLOCKFILE(fp);
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ORIENT(fp, 1);
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r = __fgetwc(fp);
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FUNLOCKFILE(fp);
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return (r);
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}
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static __inline wint_t
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__fgetwc_nbf(FILE *fp)
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{
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char buf[MB_LEN_MAX];
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size_t n, nconv;
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int c;
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wchar_t wc;
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n = 0;
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while (n < MB_CUR_MAX) {
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if ((c = __sgetc(fp)) == EOF) {
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if (n == 0)
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return (WEOF);
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break;
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}
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buf[n++] = (char)c;
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nconv = mbrtowc(&wc, buf, n, NULL);
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if (nconv == n)
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return (wc);
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else if (nconv == 0)
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return (L'\0');
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else if (nconv == (size_t)-1)
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break;
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}
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while (n-- != 0)
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__ungetc((unsigned char)buf[n], fp);
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errno = EILSEQ;
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fp->_flags |= __SERR;
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return (WEOF);
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}
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