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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)extern.h    8.1 (Berkeley) 6/6/93
  30  *
  31  * $FreeBSD: src/usr.bin/tail/extern.h,v 1.4.6.2 2001/12/19 20:29:29 iedowse Exp $
  32  */
  33
  34 #define WR(p, size) do { \
  35         if (write(STDOUT_FILENO, p, size) != size) \
  36                 oerr(); \
  37         } while(0)
  38
  39 #define TAILMAPLEN (4<<20)
  40
  41 struct mapinfo {
  42         off_t   mapoff;
  43         off_t   maxoff;
  44         size_t  maplen;
  45         char    *start;
  46         int     fd;
  47 };
  48
  49 struct file_info {
  50         FILE    *fp;
  51         char    *file_name;
  52         struct stat st;
  53 };
  54
  55 typedef struct file_info file_info_t;
  56
  57 enum STYLE { FBYTES, FLINES, RBYTES, RLINES, REVERSE };
  58
  59 void follow(file_info_t *, enum STYLE, off_t);
  60 void forward(FILE *, enum STYLE, off_t, struct stat *);
  61 void reverse(FILE *, enum STYLE, off_t, struct stat *);
  62
  63 int display_bytes(FILE *, off_t);
  64 int display_lines(FILE *, off_t);
  65
  66 void ierr(void);
  67 void oerr(void) __dead2;
  68 int mapprint(struct mapinfo *, off_t, off_t);
  69 int maparound(struct mapinfo *, off_t);
  70 void showfilename(int, const char *);
  71
  72 extern int Fflag, fflag, qflag, rflag, vflag, rval, no_files;
  73 extern const char *fname;