177 lines
4.4 KiB
C
177 lines
4.4 KiB
C
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/***
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*fgetwc.c - get a wide character from a stream
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*
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* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines fgetwc() - read a wide character from a stream
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*
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*Revision History:
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* 04-26-93 CFW Module created.
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* 04-30-93 CFW Bring wide char support from fgetc.c.
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* 05-03-93 CFW Add getwc function.
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* 05-10-93 CFW Optimize, fix error handling.
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* 06-02-93 CFW Wide get/put use wint_t.
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* 09-14-93 CFW Fix EOF cast bug.
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* 09-15-93 CFW Use ANSI conformant "__" names.
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* 10-01-93 CFW Test only for TEXT.
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* 10-22-93 CFW Test for invalid MB chars using global preset flag.
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* 10-28-93 CFW Test for both IOSTRG and TEXT.
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* 02-07-94 CFW POSIXify.
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* 08-31-94 CFW Fix for "C" locale, call mbtowc().
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* 09-06-94 CFW Replace MTHREAD with _MT.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 03-07-95 GJF _[un]lock_str macros now take FILE * arg.
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* 06-12-95 GJF Replaced _osfile[] with _osfile() (macro referencing
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* field in ioinfo struct).
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* 07-28-95 GJF Replaced _osfile() with _osfile_safe().
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* 04-18-97 JWM Explicit cast added to avoid new C4242 warnings.
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* 02-27-98 GJF Exception-safe locking.
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#include <cruntime.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <dbgint.h>
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#include <file2.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <msdos.h>
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#include <errno.h>
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#include <wchar.h>
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#include <tchar.h>
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#include <setlocal.h>
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#ifdef _MT /* multi-thread; define both fgetwc and _getwc_lk */
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/***
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*wint_t fgetwc(stream) - read a wide character from a stream
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*
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*Purpose:
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* reads a wide character from the given stream
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*
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*Entry:
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* FILE *stream - stream to read wide character from
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*
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*Exit:
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* returns the wide character read
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* returns WEOF if at end of file or error occurred
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*
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*Exceptions:
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*
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*******************************************************************************/
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wint_t __cdecl fgetwc (
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REG1 FILE *stream
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)
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{
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wint_t retval;
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_ASSERTE(stream != NULL);
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#ifdef _MT
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_lock_str(stream);
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__try {
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#endif
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retval = _getwc_lk(stream);
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#ifdef _MT
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}
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__finally {
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_unlock_str(stream);
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}
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#endif
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return(retval);
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}
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/***
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*_getwc_lk() - getwc() core routine (locked version)
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*
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*Purpose:
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* Core getwc() routine; assumes stream is already locked.
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*
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* [See getwc() above for more info.]
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*
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*Entry: [See getwc()]
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*
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*Exit: [See getwc()]
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*
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*Exceptions:
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*
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*******************************************************************************/
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wint_t __cdecl _getwc_lk (
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REG1 FILE *stream
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)
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{
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#else /* non multi-thread; just define fgetwc */
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wint_t __cdecl fgetwc (
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REG1 FILE *stream
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)
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{
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#endif /* rejoin common code */
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#ifndef _NTSUBSET_
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if (!(stream->_flag & _IOSTRG) && (_osfile_safe(_fileno(stream)) &
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FTEXT))
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{
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int size = 1;
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int ch;
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char mbc[4];
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wchar_t wch;
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/* text (multi-byte) mode */
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if ((ch = _getc_lk(stream)) == EOF)
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return WEOF;
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mbc[0] = (char)ch;
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if (isleadbyte((unsigned char)mbc[0]))
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{
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if ((ch = _getc_lk(stream)) == EOF)
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{
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ungetc(mbc[0], stream);
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return WEOF;
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}
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mbc[1] = (char)ch;
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size = 2;
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}
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if (mbtowc(&wch, mbc, size) == -1)
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{
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/*
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* Conversion failed! Set errno and return
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* failure.
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*/
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errno = EILSEQ;
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return WEOF;
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}
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return wch;
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}
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#endif
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/* binary (Unicode) mode */
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if ((stream->_cnt -= sizeof(wchar_t)) >= 0)
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return *((wchar_t *)(stream->_ptr))++;
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else
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return (wint_t) _filwbuf(stream);
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}
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#undef getwc
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wint_t __cdecl getwc (
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FILE *stream
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)
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{
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return fgetwc(stream);
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}
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#endif /* _POSIX_ */
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