1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/stand/common/misc.c 332154 2018-04-06 21:37:25Z kevans $");
29
30#include <string.h>
31#include <stand.h>
32#include <bootstrap.h>
33
34/*
35 * Concatenate the (argc) elements of (argv) into a single string, and return
36 * a copy of same.
37 */
38char *
39unargv(int argc, char *argv[])
40{
41    size_t	hlong;
42    int		i;
43    char	*cp;
44
45    for (i = 0, hlong = 0; i < argc; i++)
46	hlong += strlen(argv[i]) + 2;
47
48    if(hlong == 0)
49	return(NULL);
50
51    cp = malloc(hlong);
52    cp[0] = 0;
53    for (i = 0; i < argc; i++) {
54	strcat(cp, argv[i]);
55	if (i < (argc - 1))
56	  strcat(cp, " ");
57    }
58
59    return(cp);
60}
61
62/*
63 * Get the length of a string in kernel space
64 */
65size_t
66strlenout(vm_offset_t src)
67{
68    char	c;
69    size_t	len;
70
71    for (len = 0; ; len++) {
72	archsw.arch_copyout(src++, &c, 1);
73	if (c == 0)
74	    break;
75    }
76    return(len);
77}
78
79/*
80 * Make a duplicate copy of a string in kernel space
81 */
82char *
83strdupout(vm_offset_t str)
84{
85    char	*result, *cp;
86
87    result = malloc(strlenout(str) + 1);
88    for (cp = result; ;cp++) {
89	archsw.arch_copyout(str++, cp, 1);
90	if (*cp == 0)
91	    break;
92    }
93    return(result);
94}
95
96/* Zero a region in kernel space. */
97void
98kern_bzero(vm_offset_t dest, size_t len)
99{
100	char buf[256];
101	size_t chunk, resid;
102
103	bzero(buf, sizeof(buf));
104	resid = len;
105	while (resid > 0) {
106		chunk = min(sizeof(buf), resid);
107		archsw.arch_copyin(buf, dest, chunk);
108		resid -= chunk;
109		dest += chunk;
110	}
111}
112
113/*
114 * Read the specified part of a file to kernel space.  Unlike regular
115 * pread, the file pointer is advanced to the end of the read data,
116 * and it just returns 0 if successful.
117 */
118int
119kern_pread(int fd, vm_offset_t dest, size_t len, off_t off)
120{
121
122	if (lseek(fd, off, SEEK_SET) == -1) {
123#ifdef DEBUG
124		printf("\nlseek failed\n");
125#endif
126		return (-1);
127	}
128	if ((size_t)archsw.arch_readin(fd, dest, len) != len) {
129#ifdef DEBUG
130		printf("\nreadin failed\n");
131#endif
132		return (-1);
133	}
134	return (0);
135}
136
137/*
138 * Read the specified part of a file to a malloced buffer.  The file
139 * pointer is advanced to the end of the read data.
140 */
141/* coverity[ -tainted_data_return ] */
142void *
143alloc_pread(int fd, off_t off, size_t len)
144{
145	void *buf;
146
147	buf = malloc(len);
148	if (buf == NULL) {
149#ifdef DEBUG
150		printf("\nmalloc(%d) failed\n", (int)len);
151#endif
152		return (NULL);
153	}
154	if (lseek(fd, off, SEEK_SET) == -1) {
155#ifdef DEBUG
156		printf("\nlseek failed\n");
157#endif
158		free(buf);
159		return (NULL);
160	}
161	if ((size_t)read(fd, buf, len) != len) {
162#ifdef DEBUG
163		printf("\nread failed\n");
164#endif
165		free(buf);
166		return (NULL);
167	}
168	return (buf);
169}
170
171/*
172 * Display a region in traditional hexdump format.
173 */
174void
175hexdump(caddr_t region, size_t len)
176{
177    caddr_t	line;
178    int		x, c;
179    char	lbuf[80];
180#define emit(fmt, args...)	{sprintf(lbuf, fmt , ## args); pager_output(lbuf);}
181
182    pager_open();
183    for (line = region; line < (region + len); line += 16) {
184	emit("%08lx  ", (long) line);
185
186	for (x = 0; x < 16; x++) {
187	    if ((line + x) < (region + len)) {
188		emit("%02x ", *(uint8_t *)(line + x));
189	    } else {
190		emit("-- ");
191	    }
192	    if (x == 7)
193		emit(" ");
194	}
195	emit(" |");
196	for (x = 0; x < 16; x++) {
197	    if ((line + x) < (region + len)) {
198		c = *(uint8_t *)(line + x);
199		if ((c < ' ') || (c > '~'))	/* !isprint(c) */
200		    c = '.';
201		emit("%c", c);
202	    } else {
203		emit(" ");
204	    }
205	}
206	emit("|\n");
207    }
208    pager_close();
209}
210
211void
212dev_cleanup(void)
213{
214    int		i;
215
216    /* Call cleanup routines */
217    for (i = 0; devsw[i] != NULL; ++i)
218	if (devsw[i]->dv_cleanup != NULL)
219	    (devsw[i]->dv_cleanup)();
220}
221