114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/* $NetBSD: fgetwln.c,v 1.3 2009/09/24 20:38:53 roy Exp $ */
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/*-
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* Copyright (c) 2002-2004 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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwln.c,v 1.2 2004/08/06 17:00:09 tjr Exp $");
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#else
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__RCSID("$NetBSD: fgetwln.c,v 1.3 2009/09/24 20:38:53 roy Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#include <limits.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 "reentrant.h"
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#include "local.h"
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#ifdef __weak_alias
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__weak_alias(fgetwln,_fgetwln)
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#endif
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/*
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* Expand the line buffer. Return -1 on error.
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#ifdef notdef
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* The `new size' does not account for a terminating '\0',
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* so we add 1 here.
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#endif
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*/
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static int
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__slbexpand(FILE *fp, size_t newsize)
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{
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void *p;
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#ifdef notdef
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++newsize;
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#endif
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_DIAGASSERT(fp != NULL);
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/* fp->_lb._size is an int ..... */
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if (newsize > INT_MAX) {
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errno = EOVERFLOW;
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return (-1);
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}
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if ((size_t)fp->_lb._size >= newsize)
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return (0);
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if ((p = realloc(fp->_lb._base, newsize)) == NULL)
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return (-1);
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fp->_lb._base = p;
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fp->_lb._size = newsize;
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return (0);
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}
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wchar_t *
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fgetwln(FILE * __restrict fp, size_t *lenp)
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{
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wint_t wc;
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size_t len;
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FLOCKFILE(fp);
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_SET_ORIENTATION(fp, 1);
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len = 0;
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while ((wc = __fgetwc_unlock(fp)) != WEOF) {
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#define GROW 512
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if (len * sizeof(wchar_t) >= (size_t)fp->_lb._size &&
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__slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
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goto error;
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*((wchar_t *)(void *)fp->_lb._base + len++) = wc;
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if (wc == L'\n')
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break;
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}
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if (len == 0)
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goto error;
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FUNLOCKFILE(fp);
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*lenp = len;
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return ((wchar_t *)(void *)fp->_lb._base);
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error:
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FUNLOCKFILE(fp);
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*lenp = 0;
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return (NULL);
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}
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