lib/libc/stdio/local.h

   1 /*      $NetBSD: local.h,v 1.29 2010/10/24 17:44:32 tron 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 <stdbool.h>
  42
  43 /*
  44  * Information local to this implementation of stdio,
  45  * in particular, macros and private variables.
  46  */
  47
  48 extern int      __sflush __P((FILE *));
  49 extern FILE     *__sfp __P((void));
  50 extern void     __sfpinit __P((FILE *));
  51 extern int      __srefill __P((FILE *));
  52 extern int      __sread __P((void *, char *, int));
  53 extern int      __swrite __P((void *, char const *, int));
  54 extern fpos_t   __sseek __P((void *, fpos_t, int));
  55 extern int      __sclose __P((void *));
  56 extern void     __sinit __P((void));
  57 extern void     _cleanup __P((void));
  58 extern void     (*__cleanup) __P((void));
  59 extern void     __smakebuf __P((FILE *));
  60 extern int      __swhatbuf __P((FILE *, size_t *, int *));
  61 extern int      _fwalk __P((int (*)(FILE *)));
  62 extern char     *_mktemp __P((char *));
  63 extern int      __swsetup __P((FILE *));
  64 extern int      __sflags __P((const char *, int *));
  65 extern int      __svfscanf __P((FILE * __restrict, const char * __restrict,
  66                     _BSD_VA_LIST_))
  67                     __attribute__((__format__(__scanf__, 2, 0)));
  68 extern int      __svfscanf_unlocked __P((FILE * __restrict, const char * __restrict,
  69                     _BSD_VA_LIST_))
  70                     __attribute__((__format__(__scanf__, 2, 0)));
  71 extern int      __vfprintf_unlocked __P((FILE * __restrict, const char * __restrict,
  72                     _BSD_VA_LIST_));
  73
  74
  75 extern int      __sdidinit;
  76
  77 extern int      __gettemp __P((char *, int *, int));
  78
  79 extern wint_t   __fgetwc_unlock __P((FILE *));
  80 extern wint_t   __fputwc_unlock __P((wchar_t, FILE *));
  81
  82 extern ssize_t  __getdelim(char **__restrict, size_t *__restrict, int,
  83     FILE *__restrict);
  84 extern char     *__fgetstr __P((FILE * __restrict, size_t * __restrict, int));
  85 extern int       __vfwprintf_unlocked __P((FILE *, const wchar_t *,
  86     _BSD_VA_LIST_));
  87 extern int       __vfwscanf_unlocked __P((FILE * __restrict,
  88     const wchar_t * __restrict, _BSD_VA_LIST_));
  89
  90 /*
  91  * Return true iff the given FILE cannot be written now.
  92  */
  93 #define cantwrite(fp) \
  94         ((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
  95          __swsetup(fp))
  96
  97 /*
  98  * Test whether the given stdio file has an active ungetc buffer;
  99  * release such a buffer, without restoring ordinary unread data.
 100  */
 101 #define HASUB(fp) (_UB(fp)._base != NULL)
 102 #define FREEUB(fp) { \
 103         if (_UB(fp)._base != (fp)->_ubuf) \
 104                 free((char *)_UB(fp)._base); \
 105         _UB(fp)._base = NULL; \
 106 }
 107
 108 /*
 109  * test for an fgetln() buffer.
 110  */
 111 #define FREELB(fp) { \
 112         free(_EXT(fp)->_fgetstr_buf); \
 113         _EXT(fp)->_fgetstr_buf = NULL; \
 114         _EXT(fp)->_fgetstr_len = 0; \
 115 }
 116
 117 extern void __flockfile_internal __P((FILE *, int));
 118 extern void __funlockfile_internal __P((FILE *, int));
 119
 120 /*
 121  * Detect if the current file position fits in a long int.
 122  */
 123
 124 static __inline bool
 125 __fpos_overflow(fpos_t pos)
 126 {
 127   return (pos < LONG_MIN) || (pos > LONG_MAX);
 128 }