newlib-cygwin/newlib/libc/stdio/fgetwc.c

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2008-12-10 Corinna Vinschen <corinna@vinschen.de> Implement basic wide char stdio functionality, based on FreeBSD. * libc/include/stdio.h (__SORD): Define. (__SWID): Define. * libc/include/wchar.h: Add declarations for new wide char functions. (getwc): Define as macro. (getwchar): Ditto. (putwc): Ditto. (putwchar): Ditto. * libc/include/sys/reent.h (struct __sFILE): Add _mbstate member. (struct __sFILE64): Ditto. * libc/stdio/Makefile.am (ELIX_4_SOURCES): Add fgetwc.c, fgetws.c, fputwc.c, fputws.c, fwide.c, getwc.c, getwchar.c, putwc.c, putwchar.c and ungetwc.c. (CHEWOUT_FILES): Add fgetwc.def, fgetws.def, fputwc.def, fputws.def, fwide.def, getwc.def, getwchar.def, putwc.def, putwchar.def and ungetwc.def. Add header dependency rules for the new files. * libc/stdio/Makefile.in: Regenerate. * libc/stdio/fgetwc.c: New file, implementing fgetwc and _fgetwc_r. * libc/stdio/fgetws.c: New file, implementing fgetws and _fgetws_r. * libc/stdio/findfp.c (std): Initialize FILE's _mbstate member. (__sfmoreglue): Ditto. * libc/stdio/fputs.c (_fputs_r): Set stream orientation. * libc/stdio/fputwc.c: New file, implementing fputwc and _fputwc_r. * libc/stdio/fputws.c: New file, implementing fputws and _fputws_r. * libc/stdio/fread.c (_fread_r): Set stream orientation. * libc/stdio/freopen.c (_freopen_r): Reset stream orientation. Reset _mbstate. * libc/stdio/fseek.c (_fseek_r): Reset _mbstate. * libc/stdio/fwide.c: New file, implementing fwide and _fwide_r. * libc/stdio/fwrite.c (_fwrite_r): Set stream orientation. * libc/stdio/getwc.c: New file, implementing getwc and _getwc_r. * libc/stdio/getwchar.c: New file, implementing getwchar and _getwchar_r. * libc/stdio/local.h (ORIENT): New macro. * libc/stdio/puts.c (_puts_r): Set stream orientation. * libc/stdio/putwc.c: New file, implementing putwc and _putwc_r. * libc/stdio/putwchar.c: New file, implementing putwchar and _putwchar_r. * libc/stdio/refill.c (__srefill_r): Set stream orientation. * libc/stdio/stdio.tex: Add documentation for new functions. * libc/stdio/ungetc.c (_ungetc_r): Set stream orientation. * libc/stdio/ungetwc.c: New file, implementing ungetwc and _ungetwc_r. * libc/stdio/vfscanf.c (__SVFSCANF_R): Set stream orientation. * libc/stdio/wbuf.c (__swbuf_r): Ditto.
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/*-
* Copyright (c) 2002-2004 Tim J. Robbins.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
FUNCTION
<<fgetwc>>, <<getwc>>---get a wide character from a file or stream
INDEX
fgetwc
INDEX
_fgetwc_r
INDEX
getwc
INDEX
_getwc_r
ANSI_SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t fgetwc(FILE *<[fp]>);
#include <stdio.h>
#include <wchar.h>
wint_t _fgetwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
#include <stdio.h>
#include <wchar.h>
wint_t getwc(FILE *<[fp]>);
#include <stdio.h>
#include <wchar.h>
wint_t _getwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
TRAD_SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t fgetwc(<[fp]>)
FILE *<[fp]>;
#include <stdio.h>
#include <wchar.h>
wint_t _fgetwc_r(<[ptr]>, <[fp]>)
struct _reent *<[ptr]>;
FILE *<[fp]>;
#include <stdio.h>
#include <wchar.h>
wint_t getwc(<[fp]>)
FILE *<[fp]>;
#include <stdio.h>
#include <wchar.h>
wint_t _getwc_r(<[ptr]>, <[fp]>)
struct _reent *<[ptr]>;
FILE *<[fp]>;
DESCRIPTION
Use <<fgetwc>> to get the next wide character from the file or stream
identified by <[fp]>. As a side effect, <<fgetwc>> advances the file's
current position indicator.
The <<getwc>> function or macro functions identically to <<fgetwc>>. It
may be implemented as a macro, and may evaluate its argument more than
once. There is no reason ever to use it.
<<_fgetwc_r>> and <<_getwc_r>> are simply reentrant versions of
<<fgetwc>> and <<getwc>> that are passed the additional reentrant
structure pointer argument: <[ptr]>.
RETURNS
The next wide character cast to <<wint_t>>), unless there is no more data,
or the host system reports a read error; in either of these situations,
<<fgetwc>> and <<getwc>> return <<WEOF>>.
You can distinguish the two situations that cause an <<EOF>> result by
using the <<ferror>> and <<feof>> functions.
PORTABILITY
C99, POSIX.1-2001
*/
#include <_ansi.h>
#include <reent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "local.h"
static wint_t
_DEFUN(__fgetwc, (ptr, fp),
struct _reent *ptr _AND
register FILE *fp)
{
wchar_t wc;
size_t nconv;
if (fp->_r <= 0 && __srefill_r (ptr, fp))
return (WEOF);
if (MB_CUR_MAX == 1)
{
/* Fast path for single-byte encodings. */
wc = *fp->_p++;
fp->_r--;
return (wc);
}
do
{
nconv = _mbrtowc_r (ptr, &wc, (char *) fp->_p, fp->_r, &fp->_mbstate);
2008-12-10 Corinna Vinschen <corinna@vinschen.de> Implement basic wide char stdio functionality, based on FreeBSD. * libc/include/stdio.h (__SORD): Define. (__SWID): Define. * libc/include/wchar.h: Add declarations for new wide char functions. (getwc): Define as macro. (getwchar): Ditto. (putwc): Ditto. (putwchar): Ditto. * libc/include/sys/reent.h (struct __sFILE): Add _mbstate member. (struct __sFILE64): Ditto. * libc/stdio/Makefile.am (ELIX_4_SOURCES): Add fgetwc.c, fgetws.c, fputwc.c, fputws.c, fwide.c, getwc.c, getwchar.c, putwc.c, putwchar.c and ungetwc.c. (CHEWOUT_FILES): Add fgetwc.def, fgetws.def, fputwc.def, fputws.def, fwide.def, getwc.def, getwchar.def, putwc.def, putwchar.def and ungetwc.def. Add header dependency rules for the new files. * libc/stdio/Makefile.in: Regenerate. * libc/stdio/fgetwc.c: New file, implementing fgetwc and _fgetwc_r. * libc/stdio/fgetws.c: New file, implementing fgetws and _fgetws_r. * libc/stdio/findfp.c (std): Initialize FILE's _mbstate member. (__sfmoreglue): Ditto. * libc/stdio/fputs.c (_fputs_r): Set stream orientation. * libc/stdio/fputwc.c: New file, implementing fputwc and _fputwc_r. * libc/stdio/fputws.c: New file, implementing fputws and _fputws_r. * libc/stdio/fread.c (_fread_r): Set stream orientation. * libc/stdio/freopen.c (_freopen_r): Reset stream orientation. Reset _mbstate. * libc/stdio/fseek.c (_fseek_r): Reset _mbstate. * libc/stdio/fwide.c: New file, implementing fwide and _fwide_r. * libc/stdio/fwrite.c (_fwrite_r): Set stream orientation. * libc/stdio/getwc.c: New file, implementing getwc and _getwc_r. * libc/stdio/getwchar.c: New file, implementing getwchar and _getwchar_r. * libc/stdio/local.h (ORIENT): New macro. * libc/stdio/puts.c (_puts_r): Set stream orientation. * libc/stdio/putwc.c: New file, implementing putwc and _putwc_r. * libc/stdio/putwchar.c: New file, implementing putwchar and _putwchar_r. * libc/stdio/refill.c (__srefill_r): Set stream orientation. * libc/stdio/stdio.tex: Add documentation for new functions. * libc/stdio/ungetc.c (_ungetc_r): Set stream orientation. * libc/stdio/ungetwc.c: New file, implementing ungetwc and _ungetwc_r. * libc/stdio/vfscanf.c (__SVFSCANF_R): Set stream orientation. * libc/stdio/wbuf.c (__swbuf_r): Ditto.
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if (nconv == (size_t)-1)
break;
else if (nconv == (size_t)-2)
continue;
else if (nconv == 0)
{
/*
* Assume that the only valid representation of
* the null wide character is a single null byte.
*/
fp->_p++;
fp->_r--;
return (L'\0');
}
else
{
fp->_p += nconv;
fp->_r -= nconv;
return (wc);
}
}
while (__srefill_r(ptr, fp) == 0);
fp->_flags |= __SERR;
errno = EILSEQ;
return (WEOF);
}
wint_t
_DEFUN(_fgetwc_r, (ptr, fp),
struct _reent *ptr _AND
register FILE *fp)
{
wint_t r;
_flockfile (fp);
ORIENT(fp, 1);
r = __fgetwc (ptr, fp);
_funlockfile (fp);
return r;
}
wint_t
_DEFUN(fgetwc, (fp),
FILE *fp)
{
CHECK_INIT(_REENT, fp);
return _fgetwc_r (_REENT, fp);
}