extern "C" wint_t __cdecl _ungetwc_nolock(wint_t const c, FILE* const public_stream)
{
__crt_stdio_stream const stream(public_stream);
// Ungetting WEOF is expressly forbidden:
if (c == WEOF)
return WEOF;
// To unget, the stream must currently be in read mode, _or_ it must be open
// for update (read and write) and must not _currently_ be in write mode:
bool const is_in_read_mode = stream.has_all_of(_IOREAD);
bool const is_in_update_mode = stream.has_all_of(_IOUPDATE);
bool const is_in_write_mode = stream.has_all_of(_IOWRITE);
if (!is_in_read_mode && !(is_in_update_mode && !is_in_write_mode))
return WEOF;
// If the stream is currently unbuffered, buffer it:
if (stream->_base == nullptr)
__acrt_stdio_allocate_buffer_nolock(stream.public_stream());
// If the stream is file-backed and is open in text mode, we need to perform
// text mode translations:
if (!stream.is_string_backed() && (_osfile_safe(_fileno(stream.public_stream())) & FTEXT) != 0)
{
return ungetwc_text_mode_nolock(c, stream);
}
// Otherwise, the stream is string-backed or is a file-backed file open in
// binary mode; we can simply push the character back into the stream:
return ungetwc_binary_mode_nolock(c, stream);
}
int __cdecl _filwbuf (
FILE *str
)
{
REG1 FILE *stream;
_ASSERTE(str != NULL);
/* Init pointer to _iob2 entry. */
stream = str;
if (!inuse(stream) || stream->_flag & _IOSTRG)
return(WEOF);
if (stream->_flag & _IOWRT) {
stream->_flag |= _IOERR;
return(WEOF);
}
stream->_flag |= _IOREAD;
/* Get a buffer, if necessary. */
if (!anybuf(stream))
_getbuf(stream);
else
stream->_ptr = stream->_base;
stream->_cnt = _read(_fileno(stream), stream->_base, stream->_bufsiz);
if ((stream->_cnt == 0) || (stream->_cnt == 1) || stream->_cnt == -1) {
stream->_flag |= stream->_cnt ? _IOERR : _IOEOF;
stream->_cnt = 0;
return(WEOF);
}
if ( !(stream->_flag & (_IOWRT|_IORW)) &&
((_osfile_safe(_fileno(stream)) & (FTEXT|FEOFLAG)) ==
(FTEXT|FEOFLAG)) )
stream->_flag |= _IOCTRLZ;
/* Check for small _bufsiz (_SMALL_BUFSIZ). If it is small and
if it is our buffer, then this must be the first _filbuf after
an fseek on a read-access-only stream. Restore _bufsiz to its
larger value (_INTERNAL_BUFSIZ) so that the next _filbuf call,
if one is made, will fill the whole buffer. */
if ( (stream->_bufsiz == _SMALL_BUFSIZ) && (stream->_flag &
_IOMYBUF) && !(stream->_flag & _IOSETVBUF) )
{
stream->_bufsiz = _INTERNAL_BUFSIZ;
}
stream->_cnt -= sizeof(wchar_t);
return (0xffff & *((wchar_t *)(stream->_ptr))++);
}
static int __cdecl common_refill_and_read_nolock(__crt_stdio_stream const stream) throw()
{
typedef __acrt_stdio_char_traits<Character> stdio_traits;
_VALIDATE_RETURN(stream.valid(), EINVAL, stdio_traits::eof);
if (!stream.is_in_use() || stream.is_string_backed())
return stdio_traits::eof;
if (stream.has_all_of(_IOWRITE))
{
stream.set_flags(_IOERROR);
return stdio_traits::eof;
}
stream.set_flags(_IOREAD);
// Get a buffer, if necessary:
if (!stream.has_any_buffer())
__acrt_stdio_allocate_buffer_nolock(stream.public_stream());
auto const context = get_context_nolock(stream, Character());
stream->_ptr = stream->_base;
stream->_cnt = _read(_fileno(stream.public_stream()), stream->_base, stream->_bufsiz);
if (!is_buffer_valid_nolock(stream, Character()))
{
stream.set_flags(stream->_cnt != 0 ? _IOERROR : _IOEOF);
stream->_cnt = 0;
return stdio_traits::eof;
}
if (!stream.has_any_of(_IOWRITE | _IOUPDATE) &&
((_osfile_safe(_fileno(stream.public_stream())) & (FTEXT | FEOFLAG)) == (FTEXT | FEOFLAG)))
{
stream.set_flags(_IOCTRLZ);
}
// Check for small _bufsiz (_SMALL_BUFSIZ). If it is small and if it is our
// buffer, then this must be the first call to this function after an fseek
// on a read-access-only stream. Restore _bufsiz to its larger value
// (_INTERNAL_BUFSIZ) so that the next call to this function, if one is made,
// will fill the whole buffer.
if (stream->_bufsiz == _SMALL_BUFSIZ &&
stream.has_crt_buffer() &&
!stream.has_all_of(_IOBUFFER_SETVBUF))
{
stream->_bufsiz = _INTERNAL_BUFSIZ;
}
return read_character_nolock(stream, context, Character());
}
void __cdecl rewind (
FILE *str
)
{
REG1 FILE *stream;
REG2 int fd;
_VALIDATE_RETURN_VOID( (str != NULL), EINVAL);
/* Init stream pointer */
stream = str;
fd = _fileno(stream);
/* Lock the file */
_lock_str(stream);
__try {
/* Flush the stream */
_flush(stream);
/* Clear errors */
stream->_flag &= ~(_IOERR|_IOEOF);
_osfile_safe(fd) &= ~(FEOFLAG);
/* Set flags */
/* [note: _flush set _cnt=0 and _ptr=_base] */
if (stream->_flag & _IORW)
stream->_flag &= ~(_IOREAD|_IOWRT);
/* Position to beginning of file */
if(_lseek(fd,0L,0)==-1)
{
stream->_flag |= _IOERR;
}
}
__finally {
/* unlock stream */
_unlock_str(stream);
}
}
wint_t __cdecl fputwc (
wint_t ch,
FILE *str
)
{
#endif /* _MT */
if (!(str->_flag & _IOSTRG) && (_osfile_safe(_fileno(str)) & FTEXT))
{
int size;
char mbc[4];
/* text (multi-byte) mode */
if ((size = wctomb(mbc, ch)) == -1)
{
/*
* Conversion failed! Set errno and return
* failure.
*/
errno = EILSEQ;
return WEOF;
}
else if ( size == 1 )
{
if ( _putc_lk(mbc[0], str) == EOF )
return WEOF;
return (wint_t)(0xffff & ch);
}
else { /* size == 2 */
if ( (_putc_lk(mbc[0], str) == EOF) ||
(_putc_lk(mbc[1], str) == EOF) )
return WEOF;
return (wint_t)(0xffff & ch);
}
}
/* binary (Unicode) mode */
if ( (str->_cnt -= sizeof(wchar_t)) >= 0 )
return (wint_t) (0xffff & (*((wchar_t *)(str->_ptr))++ = (wchar_t)ch));
else
return (wint_t) _flswbuf(ch, str);
}
void __cdecl clearerr (
FILE *stream
)
{
_ASSERTE(stream != NULL);
_lock_str(stream);
/* Clear stdio level flags */
stream->_flag &= ~(_IOERR|_IOEOF);
/* Clear lowio level flags */
#ifdef _WIN32
_osfile_safe(_fileno(stream)) &= ~(FEOFLAG);
#else /* _WIN32 */
_osfile[_fileno(stream)] &= ~(FEOFLAG);
#endif /* _WIN32 */
_unlock_str(stream);
}
int __cdecl _filwbuf (
FILE *str
)
#endif /* _UNICODE */
{
REG1 FILE *stream=NULL;
/* In safecrt, we assume we always have a buffer */
_VALIDATE_RETURN(str != NULL, EINVAL, _TEOF);
/* Init pointer to _iob2 entry. */
stream = str;
if (!inuse(stream) || stream->_flag & _IOSTRG)
return(_TEOF);
if (stream->_flag & _IOWRT) {
stream->_flag |= _IOERR;
return(_TEOF);
}
stream->_flag |= _IOREAD;
/* Get a buffer, if necessary. */
if (!anybuf(stream))
{
#ifndef _SAFECRT_IMPL
_getbuf(stream);
#else /* _SAFECRT_IMPL */
/* In safecrt, we assume we always have a buffer */
_VALIDATE_RETURN(FALSE, EINVAL, _TEOF);
#endif /* _SAFECRT_IMPL */
}
else
{
stream->_ptr = stream->_base;
}
stream->_cnt = _read(_fileno(stream), stream->_base, stream->_bufsiz);
#ifndef _UNICODE
if ((stream->_cnt == 0) || (stream->_cnt == -1)) {
#else /* _UNICODE */
if ((stream->_cnt == 0) || (stream->_cnt == 1) || stream->_cnt == -1) {
#endif /* _UNICODE */
stream->_flag |= stream->_cnt ? _IOERR : _IOEOF;
stream->_cnt = 0;
return(_TEOF);
}
if ( !(stream->_flag & (_IOWRT|_IORW)) &&
((_osfile_safe(_fileno(stream)) & (FTEXT|FEOFLAG)) ==
(FTEXT|FEOFLAG)) )
stream->_flag |= _IOCTRLZ;
/* Check for small _bufsiz (_SMALL_BUFSIZ). If it is small and
if it is our buffer, then this must be the first _filbuf after
an fseek on a read-access-only stream. Restore _bufsiz to its
larger value (_INTERNAL_BUFSIZ) so that the next _filbuf call,
if one is made, will fill the whole buffer. */
if ( (stream->_bufsiz == _SMALL_BUFSIZ) && (stream->_flag &
_IOMYBUF) && !(stream->_flag & _IOSETVBUF) )
{
stream->_bufsiz = _INTERNAL_BUFSIZ;
}
#ifndef _UNICODE
stream->_cnt--;
return(0xff & *stream->_ptr++);
#else /* _UNICODE */
stream->_cnt -= sizeof(wchar_t);
return (0xffff & *((wchar_t *)(stream->_ptr))++);
#endif /* _UNICODE */
}
int __cdecl _flswbuf (
int ch,
FILE *str
)
#endif /* _UNICODE */
{
REG1 FILE *stream;
REG2 int charcount;
REG3 int written;
int fh;
_ASSERTE(str != NULL);
/* Init file handle and pointers */
stream = str;
fh = _fileno(stream);
if (!(stream->_flag & (_IOWRT|_IORW))) {
errno = EBADF;
stream->_flag |= _IOERR;
return(_TEOF);
} else if ((stream->_flag & _IOSTRG)) {
errno = ERANGE;
stream->_flag |= _IOERR;
return(_TEOF);
}
/* Check that _IOREAD is not set or, if it is, then so is _IOEOF. Note
that _IOREAD and IOEOF both being set implies switching from read to
write at end-of-file, which is allowed by ANSI. Note that resetting
the _cnt and _ptr fields amounts to doing an fflush() on the stream
in this case. Note also that the _cnt field has to be reset to 0 for
the error path as well (i.e., _IOREAD set but _IOEOF not set) as
well as the non-error path. */
if (stream->_flag & _IOREAD) {
stream->_cnt = 0;
if (stream->_flag & _IOEOF) {
stream->_ptr = stream->_base;
stream->_flag &= ~_IOREAD;
}
else {
stream->_flag |= _IOERR;
return(_TEOF);
}
}
stream->_flag |= _IOWRT;
stream->_flag &= ~_IOEOF;
written = charcount = stream->_cnt = 0;
/* Get a buffer for this stream, if necessary. */
if (!anybuf(stream)) {
/* Do NOT get a buffer if (1) stream is stdout/stderr, and
(2) stream is NOT a tty.
[If stdout/stderr is a tty, we do NOT set up single char
buffering. This is so that later temporary buffering will
not be thwarted by the _IONBF bit being set (see
_stbuf/_ftbuf usage).]
*/
if (!( ((stream==stdout) || (stream==stderr))
&& (_isatty(fh)) ))
_getbuf(stream);
} /* end !anybuf() */
/* If big buffer is assigned to stream... */
if (bigbuf(stream)) {
_ASSERTE(("inconsistent IOB fields", stream->_ptr - stream->_base >= 0));
charcount = (int)(stream->_ptr - stream->_base);
stream->_ptr = stream->_base + sizeof(TCHAR);
stream->_cnt = stream->_bufsiz - (int)sizeof(TCHAR);
if (charcount > 0)
written = _write(fh, stream->_base, charcount);
else
if (_osfile_safe(fh) & FAPPEND)
{
if( _lseeki64(fh,0L,SEEK_END)==-1)
{
stream->_flag |= _IOERR;
return(_TEOF);
}
}
#ifndef _UNICODE
*stream->_base = (char)ch;
#else /* _UNICODE */
*(wchar_t *)(stream->_base) = (wchar_t)(ch & 0xffff);
#endif /* _UNICODE */
}
/* Perform single character output (either _IONBF or no buffering) */
else {
charcount = sizeof(TCHAR);
#ifndef _UNICODE
written = _write(fh, &ch, charcount);
#else /* _UNICODE */
{
char mbc[4];
*(wchar_t *)mbc = (wchar_t)(ch & 0xffff);
written = _write(fh, mbc, charcount);
}
#endif /* _UNICODE */
}
/* See if the _write() was successful. */
if (written != charcount) {
stream->_flag |= _IOERR;
return(_TEOF);
}
#ifndef _UNICODE
return(ch & 0xff);
#else /* _UNICODE */
return(ch & 0xffff);
#endif /* _UNICODE */
}
wint_t __cdecl ungetwc (
wint_t ch,
FILE *str
)
{
#endif /* _MT */
_ASSERTE(str != NULL);
/*
* Requirements for success:
*
* 1. Character to be pushed back on the stream must not be WEOF.
*
* 2. The stream must currently be in read mode, or must be open for
* update (i.e., read/write) and must NOT currently be in write
* mode.
*/
if ( (ch != WEOF) &&
( (str->_flag & _IOREAD) || ((str->_flag & _IORW) &&
!(str->_flag & _IOWRT))
)
)
{
/* If stream is unbuffered, get one. */
if (str->_base == NULL)
_getbuf(str);
if (!(str->_flag & _IOSTRG) && (_osfile_safe(_fileno(str)) &
FTEXT))
{
/*
* Text mode, sigh... Convert the wc to a mbc.
*/
int size;
char mbc[4];
if ((size = wctomb(mbc, ch)) == -1)
{
/*
* Conversion failed! Set errno and return
* failure.
*/
errno = EILSEQ;
return WEOF;
}
/* we know _base != NULL; since file is buffered */
if (str->_ptr == str->_base)
{
if (str->_cnt)
/* my back is against the wall; i've already done
* ungetwc, and there's no room for this one
*/
return WEOF;
str->_ptr += size;
}
if ( size == 1 )
{
*--str->_ptr = mbc[0];
}
else /* size == 2 */
{
*--str->_ptr = mbc[1];
*--str->_ptr = mbc[0];
}
str->_cnt += size;
str->_flag &= ~_IOEOF;
str->_flag |= _IOREAD; /* may already be set */
return (wint_t) (0x0ffff & ch);
}
/*
* Binary mode - push back the wide char.
*/
/* we know _base != NULL; since file is buffered */
if (str->_ptr == str->_base)
{
if (str->_cnt)
/* my back is against the wall; i've already done
* ungetc, and there's no room for this one
*/
return WEOF;
str->_ptr += sizeof(wchar_t);
}
str->_cnt += sizeof(wchar_t);
str->_flag &= ~_IOEOF;
str->_flag |= _IOREAD; /* may already be set */
return (wint_t) (*--((wchar_t *)(str->_ptr)) = (wchar_t)(ch & 0xffff));
}
return WEOF;
}
int __cdecl _filwbuf (
FILE *str
)
#endif /* _UNICODE */
{
#ifdef _NTSUBSET_
return(_TEOF);
#else /* ndef _NTSUBSET_ */
REG1 FILE *stream;
_ASSERTE(str != NULL);
/* Init pointer to _iob2 entry. */
stream = str;
if (!inuse(stream) || stream->_flag & _IOSTRG)
return(_TEOF);
if (stream->_flag & _IOWRT) {
#ifdef _POSIX_
errno = EBADF;
#endif
stream->_flag |= _IOERR;
return(_TEOF);
}
stream->_flag |= _IOREAD;
/* Get a buffer, if necessary. */
if (!anybuf(stream))
_getbuf(stream);
else
stream->_ptr = stream->_base;
#ifdef _POSIX_
stream->_cnt = read(fileno(stream), stream->_base, stream->_bufsiz);
#else
stream->_cnt = _read(_fileno(stream), stream->_base, stream->_bufsiz);
#endif
#ifndef _UNICODE
if ((stream->_cnt == 0) || (stream->_cnt == -1)) {
#else /* _UNICODE */
if ((stream->_cnt == 0) || (stream->_cnt == 1) || stream->_cnt == -1) {
#endif /* _UNICODE */
stream->_flag |= stream->_cnt ? _IOERR : _IOEOF;
stream->_cnt = 0;
return(_TEOF);
}
#ifndef _POSIX_
if ( !(stream->_flag & (_IOWRT|_IORW)) &&
((_osfile_safe(_fileno(stream)) & (FTEXT|FEOFLAG)) ==
(FTEXT|FEOFLAG)) )
stream->_flag |= _IOCTRLZ;
#endif
/* Check for small _bufsiz (_SMALL_BUFSIZ). If it is small and
if it is our buffer, then this must be the first _filbuf after
an fseek on a read-access-only stream. Restore _bufsiz to its
larger value (_INTERNAL_BUFSIZ) so that the next _filbuf call,
if one is made, will fill the whole buffer. */
if ( (stream->_bufsiz == _SMALL_BUFSIZ) && (stream->_flag &
_IOMYBUF) && !(stream->_flag & _IOSETVBUF) )
{
stream->_bufsiz = _INTERNAL_BUFSIZ;
}
#ifndef _UNICODE
stream->_cnt--;
return(0xff & *stream->_ptr++);
#else /* _UNICODE */
stream->_cnt -= sizeof(wchar_t);
return (0xffff & *((wchar_t *)(stream->_ptr))++);
#endif /* _UNICODE */
#endif /* _NTSUBSET_ */
}
#else /* ndef _WIN32 */
#if defined(_M_MPPC) || defined(_M_M68K)
#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <io.h>
#include <dbgint.h>
#include <malloc.h>
#include <internal.h>
#include <msdos.h>
/***
*int _filbuf(stream) - fill buffer and get first character
*
*Purpose:
* get a buffer if the file doesn't have one, read into it, return first
* char. try to get a buffer, if a user buffer is not assigned. called
* only from getc; intended for use only within library. assume no input
* stream is to remain unbuffered when memory is available unless it is
* marked _IONBF. at worst, give it a single char buffer. the need for a
* buffer, no matter how small, becomes evident when we consider the
* ungetc's necessary in scanf
*
*Entry:
* FILE *stream - stream to read from
*
*Exit:
* returns first character from buffer (next character to be read)
* returns EOF if the FILE is actually a string, or not open for reading,
* or if open for writing or if no more chars to read.
* all fields in FILE structure may be changed except _file.
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _filbuf (
FILE *str
)
{
REG1 FILE *stream;
_ASSERTE(str != NULL);
/* Init pointer to _iob2 entry. */
stream = str;
if (!inuse(stream) || stream->_flag & _IOSTRG)
return(EOF);
if (stream->_flag & _IOWRT) {
stream->_flag |= _IOERR;
return(EOF);
}
stream->_flag |= _IOREAD;
/* Get a buffer, if necessary. */
if (!anybuf(stream))
_getbuf(stream);
else
stream->_ptr = stream->_base;
stream->_cnt = _read(_fileno(stream), stream->_base, stream->_bufsiz);
if ((stream->_cnt == 0) || (stream->_cnt == -1)) {
stream->_flag |= stream->_cnt ? _IOERR : _IOEOF;
stream->_cnt = 0;
return(EOF);
}
if ( !(stream->_flag & (_IOWRT|_IORW)) &&
((_osfile[_fileno(stream)] & (FTEXT|FEOFLAG)) == (FTEXT|FEOFLAG)) )
stream->_flag |= _IOCTRLZ;
stream->_cnt--;
return(0xff & *stream->_ptr++);
}
extern "C" wint_t __cdecl _fgetwc_nolock(FILE* const public_stream)
{
__crt_stdio_stream const stream(public_stream);
// If the stream is backed by a real file and is open in a Unicode text mode,
// we need to read two bytes (note that we read two bytes for both UTF-8 and
// UTF-16 backed streams, since lowio translates UTF-8 to UTF-16 when we read.
if (!stream.is_string_backed() &&
_textmode_safe(_fileno(stream.public_stream())) != __crt_lowio_text_mode::ansi)
{
wchar_t wc;
// Compose the wide character by reading byte-by-byte from the stream:
char* const wc_first = reinterpret_cast<char*>(&wc);
char* const wc_last = wc_first + sizeof(wc);
for (char* it = wc_first; it != wc_last; ++it)
{
int const c = _getc_nolock(stream.public_stream());
if (c == EOF)
return WEOF;
*it = static_cast<char>(c);
}
return wc;
}
if (!stream.is_string_backed() &&
(_osfile_safe(_fileno(stream.public_stream())) & FTEXT))
{
int size = 1;
int ch;
char mbc[4];
wchar_t wch;
/* text (multi-byte) mode */
if ((ch = _getc_nolock(stream.public_stream())) == EOF)
return WEOF;
mbc[0] = static_cast<char>(ch);
if (isleadbyte(static_cast<unsigned char>(mbc[0])))
{
if ((ch = _getc_nolock(stream.public_stream())) == EOF)
{
ungetc(mbc[0], stream.public_stream());
return WEOF;
}
mbc[1] = static_cast<char>(ch);
size = 2;
}
if (mbtowc(&wch, mbc, size) == -1)
{
// Conversion failed! Set errno and return failure:
errno = EILSEQ;
return WEOF;
}
return wch;
}
// binary (Unicode) mode
if (stream->_cnt >= static_cast<int>(sizeof(wchar_t)))
{
stream->_cnt -= static_cast<int>(sizeof(wchar_t));
return *reinterpret_cast<wchar_t*&>(stream->_ptr)++;
}
else
{
return static_cast<wint_t>(__acrt_stdio_refill_and_read_wide_nolock(stream.public_stream()));
}
}
