usr.bin/tail/extern.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)extern.h    8.1 (Berkeley) 6/6/93
  34  *
  35  * $FreeBSD: src/usr.bin/tail/extern.h,v 1.4.6.2 2001/12/19 20:29:29 iedowse Exp $
  36  * $DragonFly: src/usr.bin/tail/extern.h,v 1.6 2005/03/01 21:37:33 cpressey Exp $
  37  */
  38
  39 #define WR(p, size) do { \
  40         if (write(STDOUT_FILENO, p, size) != size) \
  41                 oerr(); \
  42         } while(0)
  43
  44 #define TAILMAPLEN (4<<20)
  45
  46 struct mapinfo {
  47         off_t   mapoff;
  48         off_t   maxoff;
  49         size_t  maplen;
  50         char    *start;
  51         int     fd;
  52 };
  53
  54 struct file_info {
  55         FILE    *fp;
  56         char    *file_name;
  57         struct stat st;
  58 };
  59
  60 typedef struct file_info file_info_t;
  61
  62 enum STYLE { FBYTES, FLINES, RBYTES, RLINES, REVERSE };
  63
  64 void follow(file_info_t *, enum STYLE, off_t);
  65 void forward(FILE *, enum STYLE, off_t, struct stat *);
  66 void reverse(FILE *, enum STYLE, off_t, struct stat *);
  67
  68 int display_bytes(FILE *, off_t);
  69 int display_lines(FILE *, off_t);
  70
  71 void ierr(void);
  72 void oerr(void);
  73 int mapprint(struct mapinfo *, off_t, off_t);
  74 int maparound(struct mapinfo *, off_t);
  75 void showfilename(int, const char *);
  76
  77 extern int Fflag, fflag, rflag, rval, no_files;
  78 extern const char *fname;