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local.h revision 1.4 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Chris Torek.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	from: @(#)local.h	5.3 (Berkeley) 5/6/93
     37  *	$Id: local.h,v 1.4 1994/01/04 05:38:22 cgd Exp $
     38  */
     39 
     40 /*
     41  * Information local to this implementation of stdio,
     42  * in particular, macros and private variables.
     43  */
     44 
     45 int	__sflush __P((FILE *));
     46 FILE	*__sfp __P((void));
     47 int	__srefill __P((FILE *));
     48 int	__sread __P((void *, char *, int));
     49 int	__swrite __P((void *, char const *, int));
     50 fpos_t	__sseek __P((void *, fpos_t, int));
     51 int	__sclose __P((void *));
     52 void	__sinit __P((void));
     53 void	_cleanup __P((void));
     54 void	(*__cleanup) __P((void));
     55 void	__smakebuf __P((FILE *));
     56 int	__swhatbuf __P((FILE *, size_t *, int *));
     57 int	_fwalk __P((int (*)(FILE *)));
     58 int	__swsetup __P((FILE *));
     59 int	__sflags __P((const char *, int *));
     60 
     61 extern int __sdidinit;
     62 
     63 /*
     64  * Return true iff the given FILE cannot be written now.
     65  */
     66 #define	cantwrite(fp) \
     67 	((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
     68 	 __swsetup(fp))
     69 
     70 /*
     71  * Test whether the given stdio file has an active ungetc buffer;
     72  * release such a buffer, without restoring ordinary unread data.
     73  */
     74 #define	HASUB(fp) ((fp)->_ub._base != NULL)
     75 #define	FREEUB(fp) { \
     76 	if ((fp)->_ub._base != (fp)->_ubuf) \
     77 		free((char *)(fp)->_ub._base); \
     78 	(fp)->_ub._base = NULL; \
     79 }
     80 
     81 /*
     82  * test for an fgetln() buffer.
     83  */
     84 #define	HASLB(fp) ((fp)->_lb._base != NULL)
     85 #define	FREELB(fp) { \
     86 	free((char *)(fp)->_lb._base); \
     87 	(fp)->_lb._base = NULL; \
     88 }
     89