1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Edward Sze-Tyan Wang.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34
35__FBSDID("$FreeBSD$");
36
37#ifndef lint
38static const char sccsid[] = "@(#)misc.c	8.1 (Berkeley) 6/6/93";
39#endif
40
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <sys/mman.h>
44
45#include <err.h>
46#include <errno.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <unistd.h>
51
52#include "extern.h"
53
54void
55ierr(const char *fname)
56{
57	warn("%s", fname);
58	rval = 1;
59}
60
61void
62oerr(void)
63{
64	err(1, "stdout");
65}
66
67/*
68 * Print `len' bytes from the file associated with `mip', starting at
69 * absolute file offset `startoff'. May move map window.
70 */
71int
72mapprint(struct mapinfo *mip, off_t startoff, off_t len)
73{
74	int n;
75
76	while (len > 0) {
77		if (startoff < mip->mapoff || startoff >= mip->mapoff +
78		    (off_t)mip->maplen) {
79			if (maparound(mip, startoff) != 0)
80				return (1);
81		}
82		n = (mip->mapoff + mip->maplen) - startoff;
83		if (n > len)
84			n = len;
85		WR(mip->start + (startoff - mip->mapoff), n);
86		startoff += n;
87		len -= n;
88	}
89	return (0);
90}
91
92/*
93 * Move the map window so that it contains the byte at absolute file
94 * offset `offset'. The start of the map window will be TAILMAPLEN
95 * aligned.
96 */
97int
98maparound(struct mapinfo *mip, off_t offset)
99{
100
101	if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0)
102		return (1);
103
104	mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1);
105	mip->maplen = TAILMAPLEN;
106	if ((off_t)mip->maplen > mip->maxoff - mip->mapoff)
107		mip->maplen = mip->maxoff - mip->mapoff;
108	if (mip->maplen <= 0)
109		abort();
110	if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED,
111	     mip->fd, mip->mapoff)) == MAP_FAILED)
112		return (1);
113
114	return (0);
115}
116
117/*
118 * Print the file name without stdio buffering.
119 */
120void
121printfn(const char *fn, int print_nl)
122{
123
124	if (print_nl)
125		WR("\n", 1);
126	WR("==> ", 4);
127	WR(fn, strlen(fn));
128	WR(" <==\n", 5);
129}
130