extern.h revision 193488 
12736Sdfr/*-
22736Sdfr * Copyright (c) 1991, 1993
32736Sdfr *	The Regents of the University of California.  All rights reserved.
42736Sdfr *
52736Sdfr * 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: head/usr.bin/tail/extern.h 193488 2009-06-05 09:08:53Z brian $
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
45struct mapinfo {
46	off_t	mapoff;
47	off_t	maxoff;
48	size_t	maplen;
49	char	*start;
50	int	fd;
51};
52
53struct file_info {
54	FILE *fp;
55	char *file_name;
56	struct stat st;
57};
58
59typedef struct file_info file_info_t;
60
61enum STYLE { NOTSET = 0, FBYTES, FLINES, RBYTES, RLINES, REVERSE };
62
63void follow(file_info_t *, enum STYLE, off_t);
64void forward(FILE *, const char *, enum STYLE, off_t, struct stat *);
65void reverse(FILE *, const char *, enum STYLE, off_t, struct stat *);
66
67int bytes(FILE *, const char *, off_t);
68int lines(FILE *, const char *, off_t);
69
70void ierr(const char *);
71void oerr(void);
72int mapprint(struct mapinfo *, off_t, off_t);
73int maparound(struct mapinfo *, off_t);
74
75extern int Fflag, fflag, qflag, rflag, rval, no_files;
76