xref: /freebsd/usr.bin/tail/extern.h (revision 87569f75a91f298c52a71823c04d41cf53c88889)
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   * $FreeBSD$
36   */
37  
38  #define	WR(p, size) do { \
39  	if (write(STDOUT_FILENO, p, size) != (ssize_t)size) \
40  		oerr(); \
41  	} while(0)
42  
43  #define TAILMAPLEN (4<<20)
44  
45  struct mapinfo {
46  	off_t	mapoff;
47  	off_t	maxoff;
48  	size_t	maplen;
49  	char	*start;
50  	int	fd;
51  };
52  
53  struct file_info {
54  	FILE *fp;
55  	char *file_name;
56  	struct stat st;
57  };
58  
59  typedef struct file_info file_info_t;
60  
61  enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE };
62  
63  void follow(file_info_t *, enum STYLE, off_t);
64  void forward(FILE *, enum STYLE, off_t, struct stat *);
65  void reverse(FILE *, enum STYLE, off_t, struct stat *);
66  
67  int bytes(FILE *, off_t);
68  int lines(FILE *, off_t);
69  
70  void ierr(void);
71  void oerr(void);
72  int mapprint(struct mapinfo *, off_t, off_t);
73  int maparound(struct mapinfo *, off_t);
74  
75  extern int Fflag, fflag, rflag, rval, no_files;
76  extern const char *fname;
77