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 * This code is derived from software contributed to Berkeley by
8 * Edward Sze-Tyan Wang.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35
36 #ifndef lint
37 static const char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93";
38 #endif
39
40 #include <sys/types.h>
41 #include <sys/stat.h>
42 #include <sys/mman.h>
43
44 #include <err.h>
45 #include <errno.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #include <libcasper.h>
52 #include <casper/cap_fileargs.h>
53
54 #include "extern.h"
55
56 void
ierr(const char * fname)57 ierr(const char *fname)
58 {
59 warn("%s", fname);
60 rval = 1;
61 }
62
63 void
oerr(void)64 oerr(void)
65 {
66 err(1, "stdout");
67 }
68
69 /*
70 * Print `len' bytes from the file associated with `mip', starting at
71 * absolute file offset `startoff'. May move map window.
72 */
73 int
mapprint(struct mapinfo * mip,off_t startoff,off_t len)74 mapprint(struct mapinfo *mip, off_t startoff, off_t len)
75 {
76 int n;
77
78 while (len > 0) {
79 if (startoff < mip->mapoff || startoff >= mip->mapoff +
80 (off_t)mip->maplen) {
81 if (maparound(mip, startoff) != 0)
82 return (1);
83 }
84 n = (mip->mapoff + mip->maplen) - startoff;
85 if (n > len)
86 n = len;
87 WR(mip->start + (startoff - mip->mapoff), n);
88 startoff += n;
89 len -= n;
90 }
91 return (0);
92 }
93
94 /*
95 * Move the map window so that it contains the byte at absolute file
96 * offset `offset'. The start of the map window will be TAILMAPLEN
97 * aligned.
98 */
99 int
maparound(struct mapinfo * mip,off_t offset)100 maparound(struct mapinfo *mip, off_t offset)
101 {
102
103 if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0)
104 return (1);
105
106 mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1);
107 mip->maplen = TAILMAPLEN;
108 if ((off_t)mip->maplen > mip->maxoff - mip->mapoff)
109 mip->maplen = mip->maxoff - mip->mapoff;
110 if (mip->maplen <= 0)
111 abort();
112 if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED,
113 mip->fd, mip->mapoff)) == MAP_FAILED)
114 return (1);
115
116 return (0);
117 }
118
119 /*
120 * Print the file name without stdio buffering.
121 */
122 void
printfn(const char * fn,int print_nl)123 printfn(const char *fn, int print_nl)
124 {
125
126 if (print_nl)
127 WR("\n", 1);
128 WR("==> ", 4);
129 WR(fn, strlen(fn));
130 WR(" <==\n", 5);
131 }
132