1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#define	WR(p, size) do { \
33	ssize_t res; \
34	res = write(STDOUT_FILENO, p, size); \
35	if (res != (ssize_t)size) { \
36		if (res == -1) \
37			oerr(); \
38		else \
39			errx(1, "stdout"); \
40	} \
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	const 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);
74void printfn(const char *, int);
75
76extern int Fflag, fflag, qflag, rflag, rval, no_files, vflag;
77extern fileargs_t *fa;
78