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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [fgetwc.c] - Rev 540
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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); 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; __sfp_lock_acquire (); _flockfile (fp); ORIENT(fp, 1); r = __fgetwc (ptr, fp); _funlockfile (fp); __sfp_lock_release (); return r; } wint_t _DEFUN(fgetwc, (fp), FILE *fp) { CHECK_INIT(_REENT, fp); return _fgetwc_r (_REENT, fp); }
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