src/system/libroot/posix/stdio/local.h

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  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
  37 /*
  38  * Information local to this implementation of stdio,
  39  * in particular, macros and private variables.
  40  */
  41
  42 int      __sflush (FILE *);
  43 FILE    *__sfp (void);
  44 int          __srefill (FILE *);
  45 int          __sread (void *, char *, int);
  46 int      __swrite (void *, char const *, int);
  47 fpos_t   __sseek (void *, fpos_t, int);
  48 int      __sclose (void *);
  49 void     __sinit (void);
  50 void     _cleanup (void);
  51 void     (*_IO_cleanup) (void);
  52 void     __smakebuf (FILE *);
  53 int      __swhatbuf (FILE *, size_t *, int *);
  54 int      _fwalk (int (*)(FILE *));
  55 int      __swsetup (FILE *);
  56 int      __sflags (const char *, int *);
  57
  58 extern int __sdidinit;
  59
  60 /*
  61  * Return true if the given FILE cannot be written now.
  62  */
  63 #define cantwrite(fp) \
  64         ((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
  65          __swsetup(fp))
  66
  67 /*
  68  * Test whether the given stdio file has an active ungetc buffer;
  69  * release such a buffer, without restoring ordinary unread data.
  70  */
  71 #define HASUB(fp) ((fp)->_ub._base != NULL)
  72 #define FREEUB(fp) { \
  73         if ((fp)->_ub._base != (fp)->_ubuf) \
  74                 free((char *)(fp)->_ub._base); \
  75         (fp)->_ub._base = NULL; \
  76 }
  77
  78 /*
  79  * test for an fgetln() buffer.
  80  */
  81 #define HASLB(fp) ((fp)->_lb._base != NULL)
  82 #define FREELB(fp) { \
  83         free((char *)(fp)->_lb._base); \
  84         (fp)->_lb._base = NULL; \
  85 }