xref: /freebsd/stand/common/misc.c (revision 814bd1ed438f7dfc5bedcb1f3e772a46fe7026bb)
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("$FreeBSD$");
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  */
38 char *
39 unargv(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  */
65 size_t
66 strlenout(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  */
82 char *
83 strdupout(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. */
97 void
98 kern_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  */
118 int
119 kern_pread(readin_handle_t fd, vm_offset_t dest, size_t len, off_t off)
120 {
121 
122 	if (VECTX_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 ] */
142 void *
143 alloc_pread(readin_handle_t 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 		errno = ENOMEM;
153 		return (NULL);
154 	}
155 	if (VECTX_LSEEK(fd, off, SEEK_SET) == -1) {
156 #ifdef DEBUG
157 		printf("\nlseek failed\n");
158 #endif
159 		free(buf);
160 		return (NULL);
161 	}
162 	if ((size_t)VECTX_READ(fd, buf, len) != len) {
163 #ifdef DEBUG
164 		printf("\nread failed\n");
165 #endif
166 		free(buf);
167 		return (NULL);
168 	}
169 	return (buf);
170 }
171 
172 void
173 dev_cleanup(void)
174 {
175     int		i;
176 
177     /* Call cleanup routines */
178     for (i = 0; devsw[i] != NULL; ++i)
179 	if (devsw[i]->dv_cleanup != NULL)
180 	    (devsw[i]->dv_cleanup)();
181 }
182 
183 /*
184  * mount new rootfs and unmount old, set "currdev" environment variable.
185  */
186 int mount_currdev(struct env_var *ev, int flags, const void *value)
187 {
188 	int rv;
189 
190 	/* mount new rootfs */
191 	rv = mount(value, "/", 0, NULL);
192 	if (rv == 0) {
193 		/*
194 		 * Note we unmount any previously mounted fs only after
195 		 * successfully mounting the new because we do not want to
196 		 * end up with unmounted rootfs.
197 		 */
198 		if (ev->ev_value != NULL)
199 			unmount(ev->ev_value, 0);
200 		env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
201 	}
202 	return (rv);
203 }
204