[thirdparty/glibc.git] / libio / libio.h

/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.

   As a special exception, if you link the code in this file with
   files compiled with a GNU compiler to produce an executable,
   that does not cause the resulting executable to be covered by
   the GNU Lesser General Public License.  This exception does not
   however invalidate any other reasons why the executable file
   might be covered by the GNU Lesser General Public License.
   This exception applies to code released by its copyright holders
   in files containing the exception.  */

#ifndef _LIBIO_H
#define _LIBIO_H 1

#ifndef _LIBC
# error "libio.h should only be included when building glibc itself"
#endif
#ifdef _ISOMAC
# error "libio.h should not be included under _ISOMAC"
#endif

#include <stdio.h>

#if defined _IO_MTSAFE_IO && !defined _IO_lock_t_defined
# error "Someone forgot to include stdio-lock.h"
#endif

#define __need_wchar_t
#include <stddef.h>

#include <bits/types/__mbstate_t.h>
#include <bits/types/wint_t.h>
#include <gconv.h>

typedef struct
{
  struct __gconv_step *step;
  struct __gconv_step_data step_data;
} _IO_iconv_t;

#include <shlib-compat.h>

/* _IO_seekoff modes */
#define _IOS_INPUT	1
#define _IOS_OUTPUT	2

/* Magic number and bits for the _flags field.  The magic number is
   mostly vestigial, but preserved for compatibility.  It occupies the
   high 16 bits of _flags; the low 16 bits are actual flag bits.  */

#define _IO_MAGIC         0xFBAD0000 /* Magic number */
#define _IO_MAGIC_MASK    0xFFFF0000
#define _IO_USER_BUF          0x0001 /* Don't deallocate buffer on close. */
#define _IO_UNBUFFERED        0x0002
#define _IO_NO_READS          0x0004 /* Reading not allowed.  */
#define _IO_NO_WRITES         0x0008 /* Writing not allowed.  */
#define _IO_EOF_SEEN          0x0010
#define _IO_ERR_SEEN          0x0020
#define _IO_DELETE_DONT_CLOSE 0x0040 /* Don't call close(_fileno) on close.  */
#define _IO_LINKED            0x0080 /* In the list of all open files.  */
#define _IO_IN_BACKUP         0x0100
#define _IO_LINE_BUF          0x0200
#define _IO_TIED_PUT_GET      0x0400 /* Put and get pointer move in unison.  */
#define _IO_CURRENTLY_PUTTING 0x0800
#define _IO_IS_APPENDING      0x1000
#define _IO_IS_FILEBUF        0x2000
                           /* 0x4000  No longer used, reserved for compat.  */
#define _IO_USER_LOCK         0x8000

/* Bits for the _flags2 field.  */
#define _IO_FLAGS2_MMAP 1
#define _IO_FLAGS2_NOTCANCEL 2
#define _IO_FLAGS2_USER_WBUF 8
#define _IO_FLAGS2_NOCLOSE 32
#define _IO_FLAGS2_CLOEXEC 64
#define _IO_FLAGS2_NEED_LOCK 128

/* _IO_pos_BAD is an off64_t value indicating error, unknown, or EOF.  */
#define _IO_pos_BAD ((off64_t) -1)

/* _IO_pos_adjust adjusts an off64_t by some number of bytes.  */
#define _IO_pos_adjust(pos, delta) ((pos) += (delta))

/* _IO_pos_0 is an off64_t value indicating beginning of file.  */
#define _IO_pos_0 ((off64_t) 0)

struct _IO_jump_t;

/* A streammarker remembers a position in a buffer. */
struct _IO_marker {
  struct _IO_marker *_next;
  FILE *_sbuf;
  /* If _pos >= 0
 it points to _buf->Gbase()+_pos. FIXME comment */
  /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
  int _pos;
};

struct _IO_codecvt
{
  _IO_iconv_t __cd_in;
  _IO_iconv_t __cd_out;
};

/* Extra data for wide character streams.  */
struct _IO_wide_data
{
  wchar_t *_IO_read_ptr;	/* Current read pointer */
  wchar_t *_IO_read_end;	/* End of get area. */
  wchar_t *_IO_read_base;	/* Start of putback+get area. */
  wchar_t *_IO_write_base;	/* Start of put area. */
  wchar_t *_IO_write_ptr;	/* Current put pointer. */
  wchar_t *_IO_write_end;	/* End of put area. */
  wchar_t *_IO_buf_base;	/* Start of reserve area. */
  wchar_t *_IO_buf_end;		/* End of reserve area. */
  /* The following fields are used to support backing up and undo. */
  wchar_t *_IO_save_base;	/* Pointer to start of non-current get area. */
  wchar_t *_IO_backup_base;	/* Pointer to first valid character of
				   backup area */
  wchar_t *_IO_save_end;	/* Pointer to end of non-current get area. */

  __mbstate_t _IO_state;
  __mbstate_t _IO_last_state;
  struct _IO_codecvt _codecvt;

  wchar_t _shortbuf[1];

  const struct _IO_jump_t *_wide_vtable;
};

struct _IO_FILE_plus;

extern struct _IO_FILE_plus _IO_2_1_stdin_;
extern struct _IO_FILE_plus _IO_2_1_stdout_;
extern struct _IO_FILE_plus _IO_2_1_stderr_;

struct _IO_cookie_file;

/* Initialize one of those.  */
extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
			     void *__cookie, cookie_io_functions_t __fns);

extern int __underflow (FILE *);
extern wint_t __wunderflow (FILE *);
extern wint_t __wuflow (FILE *);
extern wint_t __woverflow (FILE *, wint_t);

#define _IO_getc_unlocked(_fp) __getc_unlocked_body (_fp)
#define _IO_peekc_unlocked(_fp)						\
  (__glibc_unlikely ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end)	\
   && __underflow (_fp) == EOF						\
   ? EOF								\
   : *(unsigned char *) (_fp)->_IO_read_ptr)
#define _IO_putc_unlocked(_ch, _fp) __putc_unlocked_body (_ch, _fp)

# define _IO_getwc_unlocked(_fp)					\
  (__glibc_unlikely ((_fp)->_wide_data == NULL				\
		     || ((_fp)->_wide_data->_IO_read_ptr		\
			 >= (_fp)->_wide_data->_IO_read_end))		\
   ? __wuflow (_fp) : (wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
# define _IO_putwc_unlocked(_wch, _fp)					\
  (__glibc_unlikely ((_fp)->_wide_data == NULL				\
		     || ((_fp)->_wide_data->_IO_write_ptr		\
			 >= (_fp)->_wide_data->_IO_write_end))		\
   ? __woverflow (_fp, _wch)						\
   : (wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))

#define _IO_feof_unlocked(_fp) __feof_unlocked_body (_fp)
#define _IO_ferror_unlocked(_fp) __ferror_unlocked_body (_fp)

extern int _IO_getc (FILE *__fp);
extern int _IO_putc (int __c, FILE *__fp);
extern int _IO_feof (FILE *__fp) __THROW;
extern int _IO_ferror (FILE *__fp) __THROW;

extern int _IO_peekc_locked (FILE *__fp);

/* This one is for Emacs. */
#define _IO_PENDING_OUTPUT_COUNT(_fp)	\
	((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)

extern void _IO_flockfile (FILE *) __THROW;
extern void _IO_funlockfile (FILE *) __THROW;
extern int _IO_ftrylockfile (FILE *) __THROW;

#define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
#define _IO_flockfile(_fp) /**/
#define _IO_funlockfile(_fp) ((void) 0)
#define _IO_ftrylockfile(_fp) /**/
#ifndef _IO_cleanup_region_start
#define _IO_cleanup_region_start(_fct, _fp) /**/
#endif
#ifndef _IO_cleanup_region_end
#define _IO_cleanup_region_end(_Doit) /**/
#endif

#define _IO_need_lock(_fp) \
  (((_fp)->_flags2 & _IO_FLAGS2_NEED_LOCK) != 0)

extern int _IO_vfscanf (FILE * __restrict, const char * __restrict,
			__gnuc_va_list, int *__restrict);
extern __ssize_t _IO_padn (FILE *, int, __ssize_t);
extern size_t _IO_sgetn (FILE *, void *, size_t);

extern off64_t _IO_seekoff (FILE *, off64_t, int, int);
extern off64_t _IO_seekpos (FILE *, off64_t, int);

extern void _IO_free_backup_area (FILE *) __THROW;


extern wint_t _IO_getwc (FILE *__fp);
extern wint_t _IO_putwc (wchar_t __wc, FILE *__fp);
extern int _IO_fwide (FILE *__fp, int __mode) __THROW;

#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
#  define _IO_fwide_maybe_incompatible \
  (__glibc_unlikely (&_IO_stdin_used == NULL))
extern const int _IO_stdin_used;
weak_extern (_IO_stdin_used);
#else
# define _IO_fwide_maybe_incompatible (0)
#endif

/* A special optimized version of the function above.  It optimizes the
   case of initializing an unoriented byte stream.  */
#define _IO_fwide(__fp, __mode) \
  ({ int __result = (__mode);						      \
     if (__result < 0 && ! _IO_fwide_maybe_incompatible)		      \
       {								      \
	 if ((__fp)->_mode == 0)					      \
	   /* We know that all we have to do is to set the flag.  */	      \
	   (__fp)->_mode = -1;						      \
	 __result = (__fp)->_mode;					      \
       }								      \
     else if (__builtin_constant_p (__mode) && (__mode) == 0)		      \
       __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;	      \
     else								      \
       __result = _IO_fwide (__fp, __result);				      \
     __result; })

extern __ssize_t _IO_wpadn (FILE *, wint_t, __ssize_t);
extern void _IO_free_wbackup_area (FILE *) __THROW;

#ifdef __LDBL_COMPAT
__LDBL_REDIR_DECL (_IO_vfscanf)
#endif

libc_hidden_proto (__overflow)
libc_hidden_proto (__underflow)
libc_hidden_proto (__uflow)
libc_hidden_proto (__woverflow)
libc_hidden_proto (__wunderflow)
libc_hidden_proto (__wuflow)
libc_hidden_proto (_IO_free_backup_area)
libc_hidden_proto (_IO_free_wbackup_area)
libc_hidden_proto (_IO_padn)
libc_hidden_proto (_IO_putc)
libc_hidden_proto (_IO_sgetn)

#ifdef _IO_MTSAFE_IO
# undef _IO_peekc
# undef _IO_flockfile
# undef _IO_funlockfile
# undef _IO_ftrylockfile

# define _IO_peekc(_fp) _IO_peekc_locked (_fp)
# define _IO_flockfile(_fp) \
  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_lock (*(_fp)->_lock)
# define _IO_funlockfile(_fp) \
  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_unlock (*(_fp)->_lock)
#endif /* _IO_MTSAFE_IO */

#endif /* _LIBIO_H */
Commit	Line	Data
26420023	1	/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
48a8f832	2	This file is part of the GNU C Library.
48a8f832 ZW	3
	4	The GNU C Library is free software; you can redistribute it and/or
	5	modify it under the terms of the GNU Lesser General Public
	6	License as published by the Free Software Foundation; either
	7	version 2.1 of the License, or (at your option) any later version.
	8
	9	The GNU C Library is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public
	15	License along with the GNU C Library; if not, see
5a82c748	16	<https://www.gnu.org/licenses/>.
48a8f832 ZW	17
	18	As a special exception, if you link the code in this file with
	19	files compiled with a GNU compiler to produce an executable,
	20	that does not cause the resulting executable to be covered by
	21	the GNU Lesser General Public License. This exception does not
	22	however invalidate any other reasons why the executable file
	23	might be covered by the GNU Lesser General Public License.
	24	This exception applies to code released by its copyright holders
	25	in files containing the exception. */
	26
6c6c962a ZW	27	#ifndef _LIBIO_H
	28	#define _LIBIO_H 1
	29
	30	#ifndef _LIBC
	31	# error "libio.h should only be included when building glibc itself"
	32	#endif
	33	#ifdef _ISOMAC
	34	# error "libio.h should not be included under _ISOMAC"
	35	#endif
48a8f832	36
a4fea3f2	37	#include <stdio.h>
48a8f832	38
6c6c962a ZW	39	#if defined _IO_MTSAFE_IO && !defined _IO_lock_t_defined
	40	# error "Someone forgot to include stdio-lock.h"
	41	#endif
	42
63fb8f9a ZW	43	#define __need_wchar_t
	44	#include <stddef.h>
	45
	46	#include <bits/types/__mbstate_t.h>
	47	#include <bits/types/wint_t.h>
	48	#include <gconv.h>
	49
70c6e156	50	typedef struct
63fb8f9a	51	{
70c6e156 FW	52	struct __gconv_step *step;
70c6e156 FW	53	struct __gconv_step_data step_data;
63fb8f9a ZW	54	} _IO_iconv_t;
63fb8f9a ZW	55
6c6c962a ZW	56	#include <shlib-compat.h>
6c6c962a ZW	57
df6c012b	58	/* _IO_seekoff modes */
48a8f832 ZW	59	#define _IOS_INPUT 1
48a8f832 ZW	60	#define _IOS_OUTPUT 2
48a8f832	61
df6c012b ZW	62	/* Magic number and bits for the _flags field. The magic number is
	63	mostly vestigial, but preserved for compatibility. It occupies the
	64	high 16 bits of _flags; the low 16 bits are actual flag bits. */
	65
	66	#define _IO_MAGIC 0xFBAD0000 /* Magic number */
	67	#define _IO_MAGIC_MASK 0xFFFF0000
	68	#define _IO_USER_BUF 0x0001 /* Don't deallocate buffer on close. */
	69	#define _IO_UNBUFFERED 0x0002
	70	#define _IO_NO_READS 0x0004 /* Reading not allowed. */
	71	#define _IO_NO_WRITES 0x0008 /* Writing not allowed. */
	72	#define _IO_EOF_SEEN 0x0010
	73	#define _IO_ERR_SEEN 0x0020
	74	#define _IO_DELETE_DONT_CLOSE 0x0040 /* Don't call close(_fileno) on close. */
	75	#define _IO_LINKED 0x0080 /* In the list of all open files. */
	76	#define _IO_IN_BACKUP 0x0100
	77	#define _IO_LINE_BUF 0x0200
	78	#define _IO_TIED_PUT_GET 0x0400 /* Put and get pointer move in unison. */
	79	#define _IO_CURRENTLY_PUTTING 0x0800
	80	#define _IO_IS_APPENDING 0x1000
	81	#define _IO_IS_FILEBUF 0x2000
	82	/* 0x4000 No longer used, reserved for compat. */
	83	#define _IO_USER_LOCK 0x8000
	84
	85	/* Bits for the _flags2 field. */
48a8f832 ZW	86	#define _IO_FLAGS2_MMAP 1
48a8f832 ZW	87	#define _IO_FLAGS2_NOTCANCEL 2
48a8f832	88	#define _IO_FLAGS2_USER_WBUF 8
34957904 ZW	89	#define _IO_FLAGS2_NOCLOSE 32
	90	#define _IO_FLAGS2_CLOEXEC 64
	91	#define _IO_FLAGS2_NEED_LOCK 128
48a8f832	92
30bfee26 ZW	93	/* _IO_pos_BAD is an off64_t value indicating error, unknown, or EOF. */
	94	#define _IO_pos_BAD ((off64_t) -1)
	95
	96	/* _IO_pos_adjust adjusts an off64_t by some number of bytes. */
	97	#define _IO_pos_adjust(pos, delta) ((pos) += (delta))
	98
	99	/* _IO_pos_0 is an off64_t value indicating beginning of file. */
	100	#define _IO_pos_0 ((off64_t) 0)
48a8f832	101
a4fea3f2	102	struct _IO_jump_t;
48a8f832 ZW	103
48a8f832 ZW	104	/* A streammarker remembers a position in a buffer. */
48a8f832 ZW	105	struct _IO_marker {
48a8f832 ZW	106	struct _IO_marker *_next;
9964a145	107	FILE *_sbuf;
48a8f832 ZW	108	/* If _pos >= 0
	109	it points to _buf->Gbase()+_pos. FIXME comment */
	110	/* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
	111	int _pos;
48a8f832 ZW	112	};
48a8f832 ZW	113
48a8f832 ZW	114	struct _IO_codecvt
48a8f832 ZW	115	{
48a8f832 ZW	116	_IO_iconv_t __cd_in;
	117	_IO_iconv_t __cd_out;
	118	};
	119
	120	/* Extra data for wide character streams. */
	121	struct _IO_wide_data
	122	{
	123	wchar_t _IO_read_ptr; / Current read pointer */
	124	wchar_t _IO_read_end; / End of get area. */
	125	wchar_t _IO_read_base; / Start of putback+get area. */
	126	wchar_t _IO_write_base; / Start of put area. */
	127	wchar_t _IO_write_ptr; / Current put pointer. */
	128	wchar_t _IO_write_end; / End of put area. */
	129	wchar_t _IO_buf_base; / Start of reserve area. */
	130	wchar_t _IO_buf_end; / End of reserve area. */
	131	/* The following fields are used to support backing up and undo. */
	132	wchar_t _IO_save_base; / Pointer to start of non-current get area. */
	133	wchar_t _IO_backup_base; / Pointer to first valid character of
	134	backup area */
	135	wchar_t _IO_save_end; / Pointer to end of non-current get area. */
	136
	137	__mbstate_t _IO_state;
	138	__mbstate_t _IO_last_state;
	139	struct _IO_codecvt _codecvt;
	140
	141	wchar_t _shortbuf[1];
	142
	143	const struct _IO_jump_t *_wide_vtable;
	144	};
48a8f832	145
48a8f832 ZW	146	struct _IO_FILE_plus;
	147
	148	extern struct _IO_FILE_plus _IO_2_1_stdin_;
	149	extern struct _IO_FILE_plus _IO_2_1_stdout_;
	150	extern struct _IO_FILE_plus _IO_2_1_stderr_;
48a8f832 ZW	151
	152	struct _IO_cookie_file;
	153
	154	/* Initialize one of those. */
	155	extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
9964a145	156	void *__cookie, cookie_io_functions_t __fns);
48a8f832	157
9964a145 ZW	158	extern int __underflow (FILE *);
	159	extern wint_t __wunderflow (FILE *);
	160	extern wint_t __wuflow (FILE *);
	161	extern wint_t __woverflow (FILE *, wint_t);
48a8f832	162
a4fea3f2	163	#define _IO_getc_unlocked(_fp) __getc_unlocked_body (_fp)
177aad3f ZW	164	#define _IO_peekc_unlocked(_fp) \
	165	(__glibc_unlikely ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end) \
	166	&& __underflow (_fp) == EOF \
	167	? EOF \
	168	: (unsigned char ) (_fp)->_IO_read_ptr)
a4fea3f2	169	#define _IO_putc_unlocked(_ch, _fp) __putc_unlocked_body (_ch, _fp)
48a8f832	170
177aad3f ZW	171	# define _IO_getwc_unlocked(_fp) \
	172	(__glibc_unlikely ((_fp)->_wide_data == NULL \
	173	\|\| ((_fp)->_wide_data->_IO_read_ptr \
	174	>= (_fp)->_wide_data->_IO_read_end)) \
9964a145	175	? __wuflow (_fp) : (wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
177aad3f ZW	176	# define _IO_putwc_unlocked(_wch, _fp) \
	177	(__glibc_unlikely ((_fp)->_wide_data == NULL \
	178	\|\| ((_fp)->_wide_data->_IO_write_ptr \
	179	>= (_fp)->_wide_data->_IO_write_end)) \
48a8f832	180	? __woverflow (_fp, _wch) \
9964a145	181	: (wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))
48a8f832	182
a4fea3f2 ZW	183	#define _IO_feof_unlocked(_fp) __feof_unlocked_body (_fp)
a4fea3f2 ZW	184	#define _IO_ferror_unlocked(_fp) __ferror_unlocked_body (_fp)
48a8f832	185
9964a145 ZW	186	extern int _IO_getc (FILE *__fp);
	187	extern int _IO_putc (int __c, FILE *__fp);
	188	extern int _IO_feof (FILE *__fp) __THROW;
	189	extern int _IO_ferror (FILE *__fp) __THROW;
48a8f832	190
9964a145	191	extern int _IO_peekc_locked (FILE *__fp);
48a8f832 ZW	192
	193	/* This one is for Emacs. */
	194	#define _IO_PENDING_OUTPUT_COUNT(_fp) \
	195	((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
	196
9964a145 ZW	197	extern void _IO_flockfile (FILE *) __THROW;
	198	extern void _IO_funlockfile (FILE *) __THROW;
	199	extern int _IO_ftrylockfile (FILE *) __THROW;
48a8f832 ZW	200
	201	#define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
	202	#define _IO_flockfile(_fp) /**/
05383720	203	#define _IO_funlockfile(_fp) ((void) 0)
48a8f832 ZW	204	#define _IO_ftrylockfile(_fp) /**/
	205	#ifndef _IO_cleanup_region_start
	206	#define _IO_cleanup_region_start(_fct, _fp) /**/
	207	#endif
	208	#ifndef _IO_cleanup_region_end
	209	#define _IO_cleanup_region_end(_Doit) /**/
	210	#endif
	211
	212	#define _IO_need_lock(_fp) \
	213	(((_fp)->_flags2 & _IO_FLAGS2_NEED_LOCK) != 0)
	214
9964a145 ZW	215	extern int _IO_vfscanf (FILE * __restrict, const char * __restrict,
9964a145 ZW	216	__gnuc_va_list, int *__restrict);
9964a145 ZW	217	extern __ssize_t _IO_padn (FILE *, int, __ssize_t);
9964a145 ZW	218	extern size_t _IO_sgetn (FILE , void , size_t);
48a8f832	219
9964a145 ZW	220	extern off64_t _IO_seekoff (FILE *, off64_t, int, int);
9964a145 ZW	221	extern off64_t _IO_seekpos (FILE *, off64_t, int);
48a8f832	222
9964a145	223	extern void _IO_free_backup_area (FILE *) __THROW;
48a8f832	224
6c6c962a	225
9964a145 ZW	226	extern wint_t _IO_getwc (FILE *__fp);
	227	extern wint_t _IO_putwc (wchar_t __wc, FILE *__fp);
	228	extern int _IO_fwide (FILE *__fp, int __mode) __THROW;
6c6c962a	229
6c6c962a ZW	230	#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
6c6c962a ZW	231	# define _IO_fwide_maybe_incompatible \
177aad3f	232	(__glibc_unlikely (&_IO_stdin_used == NULL))
48a8f832 ZW	233	extern const int _IO_stdin_used;
48a8f832 ZW	234	weak_extern (_IO_stdin_used);
6c6c962a ZW	235	#else
	236	# define _IO_fwide_maybe_incompatible (0)
	237	#endif
	238
48a8f832 ZW	239	/* A special optimized version of the function above. It optimizes the
48a8f832 ZW	240	case of initializing an unoriented byte stream. */
6c6c962a	241	#define _IO_fwide(__fp, __mode) \
48a8f832 ZW	242	({ int __result = (__mode); \
	243	if (__result < 0 && ! _IO_fwide_maybe_incompatible) \
	244	{ \
	245	if ((__fp)->_mode == 0) \
	246	/* We know that all we have to do is to set the flag. */ \
	247	(__fp)->_mode = -1; \
	248	__result = (__fp)->_mode; \
	249	} \
	250	else if (__builtin_constant_p (__mode) && (__mode) == 0) \
	251	__result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode; \
	252	else \
	253	__result = _IO_fwide (__fp, __result); \
	254	__result; })
48a8f832	255
9964a145 ZW	256	extern __ssize_t _IO_wpadn (FILE *, wint_t, __ssize_t);
9964a145 ZW	257	extern void _IO_free_wbackup_area (FILE *) __THROW;
48a8f832 ZW	258
48a8f832 ZW	259	#ifdef __LDBL_COMPAT
6c6c962a	260	__LDBL_REDIR_DECL (_IO_vfscanf)
48a8f832 ZW	261	#endif
48a8f832 ZW	262
6c6c962a ZW	263	libc_hidden_proto (__overflow)
	264	libc_hidden_proto (__underflow)
	265	libc_hidden_proto (__uflow)
	266	libc_hidden_proto (__woverflow)
	267	libc_hidden_proto (__wunderflow)
	268	libc_hidden_proto (__wuflow)
	269	libc_hidden_proto (_IO_free_backup_area)
	270	libc_hidden_proto (_IO_free_wbackup_area)
	271	libc_hidden_proto (_IO_padn)
	272	libc_hidden_proto (_IO_putc)
	273	libc_hidden_proto (_IO_sgetn)
6c6c962a ZW	274
	275	#ifdef _IO_MTSAFE_IO
	276	# undef _IO_peekc
	277	# undef _IO_flockfile
	278	# undef _IO_funlockfile
	279	# undef _IO_ftrylockfile
	280
	281	# define _IO_peekc(_fp) _IO_peekc_locked (_fp)
57094e57	282	# define _IO_flockfile(_fp) \
6c6c962a	283	if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_lock (*(_fp)->_lock)
57094e57	284	# define _IO_funlockfile(_fp) \
6c6c962a	285	if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_lock_unlock (*(_fp)->_lock)
6c6c962a ZW	286	#endif /* _IO_MTSAFE_IO */
6c6c962a ZW	287
6c6c962a	288	#endif /* _LIBIO_H */