lib/libc/stdio/local.h

   1 /*      $NetBSD: local.h,v 1.38 2014/06/18 17:47:58 christos 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(FILE *);
  50 extern FILE     *__sfp(void);
  51 extern void     __sfpinit(FILE *);
  52 extern int      __srefill(FILE *);
  53 extern ssize_t  __sread(void *, void *, size_t);
  54 extern ssize_t  __swrite(void *, const void *, size_t);
  55 extern off_t    __sseek(void *, off_t, int);
  56 extern int      __sclose(void *);
  57 extern void     __sinit(void);
  58 extern void     _cleanup(void);
  59 extern void     (*__cleanup)(void);
  60 extern void     __smakebuf(FILE *);
  61 extern int      __swhatbuf(FILE *, size_t *, int *);
  62 extern int      _fwalk(int (*)(FILE *));
  63 extern char    *_mktemp(char *);
  64 extern int      __swsetup(FILE *);
  65 extern int      __sflags(const char *, int *);
  66 extern int      __svfscanf(FILE * __restrict, const char * __restrict,
  67     va_list) __scanflike(2, 0);
  68 extern int      __svfscanf_l(FILE * __restrict, locale_t,
  69     const char * __restrict, va_list) __scanflike(3, 0);
  70 extern int      __svfscanf_unlocked_l(FILE * __restrict, locale_t,
  71     const char * __restrict, va_list) __scanflike(3, 0);
  72 extern int      __vfprintf_unlocked_l(FILE * __restrict, locale_t,
  73     const char * __restrict, va_list) __printflike(3, 0);
  74
  75
  76 extern int      __sdidinit;
  77
  78 extern wint_t   __fgetwc_unlock(FILE *);
  79 extern wint_t   __fputwc_unlock(wchar_t, FILE *);
  80
  81 extern ssize_t  __getdelim(char **__restrict, size_t *__restrict, int,
  82     FILE *__restrict);
  83 extern char     *__fgetstr(FILE * __restrict, size_t * __restrict, int);
  84 extern int       __vfwprintf_unlocked_l(FILE *, locale_t, const wchar_t *, va_list);
  85 extern int       __vfwscanf_unlocked_l(FILE * __restrict, locale_t,
  86     const wchar_t * __restrict, va_list);
  87
  88 /*
  89  * Return true iff the given FILE cannot be written now.
  90  */
  91 #define cantwrite(fp) \
  92         ((((fp)->_flags & __SWR) == 0 || (fp)->_bf._base == NULL) && \
  93          __swsetup(fp))
  94
  95 /*
  96  * Test whether the given stdio file has an active ungetc buffer;
  97  * release such a buffer, without restoring ordinary unread data.
  98  */
  99 #define HASUB(fp) (_UB(fp)._base != NULL)
 100 #define FREEUB(fp) { \
 101         if (_UB(fp)._base != (fp)->_ubuf) \
 102                 free((char *)_UB(fp)._base); \
 103         _UB(fp)._base = NULL; \
 104 }
 105
 106 /*
 107  * test for an fgetln() buffer.
 108  */
 109 #define FREELB(fp) { \
 110         free(_EXT(fp)->_fgetstr_buf); \
 111         _EXT(fp)->_fgetstr_buf = NULL; \
 112         _EXT(fp)->_fgetstr_len = 0; \
 113 }
 114
 115 extern void __flockfile_internal(FILE *, int);
 116 extern void __funlockfile_internal(FILE *, int);
 117
 118 extern char *__gets(char *);
 119
 120 /*
 121  * Detect if the current file position fits in a long int.
 122  */
 123
 124 static __inline bool
 125 __long_overflow(off_t pos)
 126 {
 127         return (pos < LONG_MIN) || (pos > LONG_MAX);
 128 }