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      1 /*	$NetBSD: local.h,v 1.38 2014/06/18 17:47:58 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)local.h	8.3 (Berkeley) 7/3/94
     35  */
     36 
     37 #include "wcio.h"
     38 #include "fileext.h"
     39 
     40 #include <limits.h>
     41 #include <stdarg.h>
     42 #include <stdbool.h>
     43 
     44 /*
     45  * Information local to this implementation of stdio,
     46  * in particular, macros and private variables.
     47  */
     48 
     49 extern int	__sflush(FILE *);
     50 extern FILE	*__sfp(void);
     51 extern void	__sfpinit(FILE *);
     52 extern int	__srefill(FILE *);
     53 extern ssize_t	__sread(void *, void *, size_t);
     54 extern ssize_t	__swrite(void *, const void *, size_t);
     55 extern off_t	__sseek(void *, off_t, int);
     56 extern int	__sclose(void *);
     57 extern void	__sinit(void);
     58 extern void	_cleanup(void);
     59 extern void	(*__cleanup)(void);
     60 extern void	__smakebuf(FILE *);
     61 extern int	__swhatbuf(FILE *, size_t *, int *);
     62 extern int	_fwalk(int (*)(FILE *));
     63 extern char    *_mktemp(char *);
     64 extern int	__swsetup(FILE *);
     65 extern int	__sflags(const char *, int *);
     66 extern int	__svfscanf(FILE * __restrict, const char * __restrict,
     67     va_list) __scanflike(2, 0);
     68 extern int	__svfscanf_l(FILE * __restrict, locale_t,
     69     const char * __restrict, va_list) __scanflike(3, 0);
     70 extern int	__svfscanf_unlocked_l(FILE * __restrict, locale_t,
     71     const char * __restrict, va_list) __scanflike(3, 0);
     72 extern int	__vfprintf_unlocked_l(FILE * __restrict, locale_t,
     73     const char * __restrict, va_list) __printflike(3, 0);
     74 
     75 
     76 extern int	__sdidinit;
     77 
     78 extern wint_t	__fgetwc_unlock(FILE *);
     79 extern wint_t	__fputwc_unlock(wchar_t, FILE *);
     80 
     81 extern ssize_t	__getdelim(char **__restrict, size_t *__restrict, int,
     82     FILE *__restrict);
     83 extern char	*__fgetstr(FILE * __restrict, size_t * __restrict, int);
     84 extern int 	 __vfwprintf_unlocked_l(FILE *, locale_t, const wchar_t *, va_list);
     85 extern int	 __vfwscanf_unlocked_l(FILE * __restrict, locale_t,
     86     const wchar_t * __restrict, va_list);
     87 
     88 /*
     89  * Return true iff the given FILE cannot be written now.
     90  */
     91 #define	cantwrite(fp) \
     92 	((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
     93 	 __swsetup(fp))
     94 
     95 /*
     96  * Test whether the given stdio file has an active ungetc buffer;
     97  * release such a buffer, without restoring ordinary unread data.
     98  */
     99 #define	HASUB(fp) (_UB(fp)._base != NULL)
    100 #define	FREEUB(fp) { \
    101 	if (_UB(fp)._base != (fp)->_ubuf) \
    102 		free((char *)_UB(fp)._base); \
    103 	_UB(fp)._base = NULL; \
    104 }
    105 
    106 /*
    107  * test for an fgetln() buffer.
    108  */
    109 #define	FREELB(fp) { \
    110 	free(_EXT(fp)->_fgetstr_buf); \
    111 	_EXT(fp)->_fgetstr_buf = NULL; \
    112 	_EXT(fp)->_fgetstr_len = 0; \
    113 }
    114 
    115 extern void __flockfile_internal(FILE *, int);
    116 extern void __funlockfile_internal(FILE *, int);
    117 
    118 extern char *__gets(char *);
    119 
    120 /*
    121  * Detect if the current file position fits in a long int.
    122  */
    123 
    124 static __inline bool
    125 __long_overflow(off_t pos)
    126 {
    127 	return (pos < LONG_MIN) || (pos > LONG_MAX);
    128 }
    129