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local.h revision 1.30 
      1 /*	$NetBSD: local.h,v 1.30 2011/07/17 20:54:34 joerg 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 __P((FILE *));
     50 extern FILE	*__sfp __P((void));
     51 extern void	__sfpinit __P((FILE *));
     52 extern int	__srefill __P((FILE *));
     53 extern int	__sread __P((void *, char *, int));
     54 extern int	__swrite __P((void *, char const *, int));
     55 extern fpos_t	__sseek __P((void *, fpos_t, int));
     56 extern int	__sclose __P((void *));
     57 extern void	__sinit __P((void));
     58 extern void	_cleanup __P((void));
     59 extern void	(*__cleanup) __P((void));
     60 extern void	__smakebuf __P((FILE *));
     61 extern int	__swhatbuf __P((FILE *, size_t *, int *));
     62 extern int	_fwalk __P((int (*)(FILE *)));
     63 extern char	*_mktemp __P((char *));
     64 extern int	__swsetup __P((FILE *));
     65 extern int	__sflags __P((const char *, int *));
     66 extern int	__svfscanf __P((FILE * __restrict, const char * __restrict,
     67 		    va_list))
     68 		    __attribute__((__format__(__scanf__, 2, 0)));
     69 extern int	__svfscanf_unlocked __P((FILE * __restrict, const char * __restrict,
     70 		    va_list))
     71 		    __attribute__((__format__(__scanf__, 2, 0)));
     72 extern int	__vfprintf_unlocked __P((FILE * __restrict, const char * __restrict,
     73 		    va_list));
     74 
     75 
     76 extern int	__sdidinit;
     77 
     78 extern int	__gettemp __P((char *, int *, int));
     79 
     80 extern wint_t	__fgetwc_unlock __P((FILE *));
     81 extern wint_t	__fputwc_unlock __P((wchar_t, FILE *));
     82 
     83 extern ssize_t	__getdelim(char **__restrict, size_t *__restrict, int,
     84     FILE *__restrict);
     85 extern char	*__fgetstr __P((FILE * __restrict, size_t * __restrict, int));
     86 extern int 	 __vfwprintf_unlocked __P((FILE *, const wchar_t *,
     87     va_list));
     88 extern int	 __vfwscanf_unlocked __P((FILE * __restrict,
     89     const wchar_t * __restrict, va_list));
     90 
     91 /*
     92  * Return true iff the given FILE cannot be written now.
     93  */
     94 #define	cantwrite(fp) \
     95 	((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
     96 	 __swsetup(fp))
     97 
     98 /*
     99  * Test whether the given stdio file has an active ungetc buffer;
    100  * release such a buffer, without restoring ordinary unread data.
    101  */
    102 #define	HASUB(fp) (_UB(fp)._base != NULL)
    103 #define	FREEUB(fp) { \
    104 	if (_UB(fp)._base != (fp)->_ubuf) \
    105 		free((char *)_UB(fp)._base); \
    106 	_UB(fp)._base = NULL; \
    107 }
    108 
    109 /*
    110  * test for an fgetln() buffer.
    111  */
    112 #define	FREELB(fp) { \
    113 	free(_EXT(fp)->_fgetstr_buf); \
    114 	_EXT(fp)->_fgetstr_buf = NULL; \
    115 	_EXT(fp)->_fgetstr_len = 0; \
    116 }
    117 
    118 extern void __flockfile_internal __P((FILE *, int));
    119 extern void __funlockfile_internal __P((FILE *, int));
    120 
    121 /*
    122  * Detect if the current file position fits in a long int.
    123  */
    124 
    125 static __inline bool
    126 __fpos_overflow(fpos_t pos)
    127 {
    128   return (pos < LONG_MIN) || (pos > LONG_MAX);
    129 }
    130