1/*	$OpenBSD: mkswap.c,v 1.19 2021/11/28 19:26:03 deraadt Exp $	*/
2/*	$NetBSD: mkswap.c,v 1.5 1996/08/31 20:58:27 mycroft Exp $	*/
3
4/*
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
12 * All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 *	This product includes software developed by the University of
15 *	California, Lawrence Berkeley Laboratories.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 *    notice, this list of conditions and the following disclaimer in the
24 *    documentation and/or other materials provided with the distribution.
25 * 3. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *	from: @(#)mkswap.c	8.1 (Berkeley) 6/6/93
42 */
43
44#include <sys/types.h>
45
46#include <err.h>
47#include <errno.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52#include "config.h"
53#include "sem.h"
54
55dev_t nodev = (dev_t)-1;
56
57static int mkoneswap(struct config *);
58
59/*
60 * Make the various swap*.c files.  Nothing to do for generic swap.
61 */
62int
63mkswap(void)
64{
65	struct config *cf;
66
67	for (cf = allcf; cf != NULL; cf = cf->cf_next)
68		if (cf->cf_root != NULL && mkoneswap(cf))
69			return (1);
70	return (0);
71}
72
73static char *
74mkdevstr(dev_t d)
75{
76	static char buf[32];
77
78	if (d == nodev)
79		(void)snprintf(buf, sizeof buf, "NODEV");
80	else
81		(void)snprintf(buf, sizeof buf, "makedev(%u, %u)",
82		    major(d), minor(d));
83	return buf;
84}
85
86static int
87mkoneswap(struct config *cf)
88{
89	char fname[200], *mountroot;
90	struct nvlist *nv;
91	FILE *fp;
92
93	(void)snprintf(fname, sizeof fname, "swap%s.c", cf->cf_name);
94	if ((fp = fopen(fname, "w")) == NULL) {
95		warn("cannot write %s", fname);
96		return (1);
97	}
98	if (fputs("\
99#include <sys/param.h>\n\
100#include <sys/conf.h>\n\
101#include <sys/systm.h>\n\n", fp) == EOF)
102		goto wrerror;
103	nv = cf->cf_root;
104	if (fprintf(fp, "dev_t\trootdev = %s;\t/* %s */\n",
105	    mkdevstr(nv->nv_int), nv->nv_str) < 0)
106		goto wrerror;
107	nv = cf->cf_dump;
108	if (fprintf(fp, "dev_t\tdumpdev = %s;\t/* %s */\n",
109	    mkdevstr(nv->nv_int), nv->nv_str) < 0)
110		goto wrerror;
111	if (fputs("\nstruct\tswdevt swdevt[] = {\n", fp) == EOF)
112		goto wrerror;
113	for (nv = cf->cf_swap; nv != NULL; nv = nv->nv_next)
114		if (fprintf(fp, "\t{ %s,\t0 },\t/* %s */\n",
115		    mkdevstr(nv->nv_int), nv->nv_str) < 0)
116			goto wrerror;
117	if (fputs("\t{ NODEV, 0 }\n};\n\n", fp) == EOF)
118		goto wrerror;
119	mountroot =
120	    cf->cf_root->nv_str == s_nfs ? "nfs_mountroot" : "dk_mountroot";
121	if (fprintf(fp, "int (*mountroot)(void) = %s;\n", mountroot) < 0)
122		goto wrerror;
123
124	if (fclose(fp)) {
125		fp = NULL;
126		goto wrerror;
127	}
128	return (0);
129wrerror:
130	warn("error writing %s", fname);
131	if (fp != NULL)
132		(void)fclose(fp);
133	/* (void)unlink(fname); */
134	return (1);
135}
136