stdio/local.h

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1990, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Chris Torek.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 /*
  59  * Information local to this implementation of stdio,
  60  * in particular, macros and private variables.
  61  */
  62
  63 extern int      __sflush __P((FILE *));
  64 extern FILE     *__sfp __P((void));
  65 extern int      __srefill __P((FILE *));
  66 extern int      __sread __P((void *, char *, int));
  67 extern int      __swrite __P((void *, char const *, int));
  68 extern fpos_t   __sseek __P((void *, fpos_t, int));
  69 extern int      __sclose __P((void *));
  70 extern void     __sinit __P((void));
  71 extern void     _cleanup __P((void));
  72 extern void     (*__cleanup) __P((void));
  73 extern void     __smakebuf __P((FILE *));
  74 extern int      __swhatbuf __P((FILE *, size_t *, int *));
  75 extern int      _fwalk __P((int (*)(FILE *)));
  76 extern int      __swsetup __P((FILE *));
  77 extern int      __sflags __P((const char *, int *));
  78
  79 extern int __sdidinit;
  80 extern void (*__cleanup) __P((void));
  81
  82 /*
  83  * Return true iff the given FILE cannot be written now.
  84  */
  85 #define cantwrite(fp) \
  86         ((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
  87          __swsetup(fp))
  88
  89 /*
  90  * Test whether the given stdio file has an active ungetc buffer;
  91  * release such a buffer, without restoring ordinary unread data.
  92  */
  93 #define HASUB(fp) ((fp)->_ub._base != NULL)
  94 #define FREEUB(fp) { \
  95         if ((fp)->_ub._base != (fp)->_ubuf) \
  96                 free((char *)(fp)->_ub._base); \
  97         (fp)->_ub._base = NULL; \
  98 }
  99
 100 /*
 101  * test for an fgetln() buffer.
 102  */
 103 #define HASLB(fp) ((fp)->_lb._base != NULL)
 104 #define FREELB(fp) { \
 105         free((char *)(fp)->_lb._base); \
 106         (fp)->_lb._base = NULL; \
 107 }