/*      $NetBSD: mkdevsw.c,v 1.16 2025/01/07 14:21:11 joe Exp $ */

/*
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by MAEKAWA Masahide ([email protected]).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: mkdevsw.c,v 1.16 2025/01/07 14:21:11 joe Exp $");

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>

#include "defs.h"

static void emitconv(FILE *);
static void emitdev(FILE *);
static void emitdevm(FILE *);
static void emitheader(FILE *);

int
mkdevsw(void)
{
       FILE *fp;

       if ((fp = fopen("devsw.c.tmp", "w")) == NULL) {
               warn("cannot create devsw.c");
               return (1);
       }

       emitheader(fp);
       emitdevm(fp);
       emitconv(fp);
       emitdev(fp);

       fflush(fp);
       if (ferror(fp)) {
               warn("error writing devsw.c");
               fclose(fp);
               return 1;
       }

       (void)fclose(fp);

       if (moveifchanged("devsw.c.tmp", "devsw.c") != 0) {
               warn("error renaming devsw.c");
               return (1);
       }

       return (0);
}

static void
emitheader(FILE *fp)
{
       autogen_comment(fp, "devsw.c");

       fputs("#include <sys/param.h>\n"
                 "#include <sys/conf.h>\n", fp);
}

static void
dentry(FILE *fp, struct hashtab *t, devmajor_t i, char p)
{
       const struct devm *dm;
       char mstr[16];

       (void)snprintf(mstr, sizeof(mstr), "%d", i);
       if ((dm = ht_lookup(t, intern(mstr))) == NULL)
               return;

       fprintf(fp, "extern const struct %cdevsw %s_%cdevsw;\n",
           p, dm->dm_name, p);
}

static void
pentry(FILE *fp, struct hashtab *t, devmajor_t i, char p)
{
       const struct devm *dm;
       char mstr[16];

       (void)snprintf(mstr, sizeof(mstr), "%d", i);
       dm = ht_lookup(t, intern(mstr));

       if (dm)
               fprintf(fp, "\t&%s_%cdevsw", dm->dm_name, p);
       else
               fputs("\tNULL", fp);

       fprintf(fp, ",\t// %3d\n", i);
}

/*
* Emit device switch table for character/block device.
*/
static void
emitdevm(FILE *fp)
{
       devmajor_t i;

       fputs("\n/* device switch table for block device */\n", fp);

       for (i = 0; i <= maxbdevm ; i++)
               dentry(fp, bdevmtab, i, 'b');

       fputs("\nconst struct bdevsw *bdevsw0[] = {\n", fp);

       for (i = 0; i <= maxbdevm; i++)
               pentry(fp, bdevmtab, i, 'b');

       fputs("};\n\nconst struct bdevsw **bdevsw = bdevsw0;\n", fp);

       fputs("const int sys_bdevsws = __arraycount(bdevsw0);\n"
                 "int max_bdevsws = __arraycount(bdevsw0);\n", fp);

       fputs("\n/* device switch table for character device */\n", fp);

       for (i = 0; i <= maxcdevm; i++)
               dentry(fp, cdevmtab, i, 'c');

       fputs("\nconst struct cdevsw *cdevsw0[] = {\n", fp);

       for (i = 0; i <= maxcdevm; i++)
               pentry(fp, cdevmtab, i, 'c');

       fputs("};\n\nconst struct cdevsw **cdevsw = cdevsw0;\n", fp);

       fputs("const int sys_cdevsws = __arraycount(cdevsw0);\n"
                 "int max_cdevsws = __arraycount(cdevsw0);\n", fp);
}

/*
* Emit device major conversion table.
*/
static void
emitconv(FILE *fp)
{
       struct devm *dm;

       fputs("\n/* device conversion table */\n"
                 "struct devsw_conv devsw_conv0[] = {\n", fp);
       TAILQ_FOREACH(dm, &alldevms, dm_next) {
               if (version < 20100430) {
                       /* Emit compatible structure */
                       fprintf(fp, "\t{ \"%s\", %d, %d },\n", dm->dm_name,
                           dm->dm_bmajor, dm->dm_cmajor);
                       continue;
               }
               struct nvlist *nv;
               const char *d_class, *d_flags = "0";
               int d_vec[2] = { 0, 0 };
               int i = 0;

               /*
                * "parse" info.  currently the rules are simple:
                *  1) first entry defines class
                *  2) next ones without n_str are d_vectdim
                *  3) next one with n_str is d_flags
                *  4) EOL
                */
               nv = dm->dm_devnodes;
               d_class = nv->nv_str;
               while ((nv = nv->nv_next) != NULL) {
                       if (i > 2)
                               panic("invalid devnode definition");
                       if (nv->nv_str) {
                               d_flags = nv->nv_str;
                               break;
                       }
                       if (nv->nv_num > INT_MAX || nv->nv_num < INT_MIN)
                               panic("out of range devnode definition");
                       d_vec[i++] = (int)nv->nv_num;
               }

               fprintf(fp, "\t{ \"%s\", %d, %d, %s, %s, { %d, %d }},\n",
                           dm->dm_name, dm->dm_bmajor, dm->dm_cmajor,
                           d_class, d_flags, d_vec[0], d_vec[1]);

       }
       fputs("};\n\n"
                 "struct devsw_conv *devsw_conv = devsw_conv0;\n"
                 "int max_devsw_convs = __arraycount(devsw_conv0);\n",
                 fp);
}

/*
* Emit specific device major informations.
*/
static void
emitdev(FILE *fp)
{
       struct devm *dm;
       char mstr[16];

       fputs("\n", fp);

       (void)strlcpy(mstr, "swap", sizeof(mstr));
       if ((dm = ht_lookup(bdevmtab, intern(mstr))) != NULL) {
               fprintf(fp, "const dev_t swapdev = makedev(%d, 0);\n",
                           dm->dm_bmajor);
       }

       (void)strlcpy(mstr, "mem", sizeof(mstr));
       if ((dm = ht_lookup(cdevmtab, intern(mstr))) == NULL)
               panic("memory device is not configured");
       fprintf(fp, "const dev_t zerodev = makedev(%d, DEV_ZERO);\n",
                   dm->dm_cmajor);

       fputs("\n/* mem_no is only used in iskmemdev() */\n", fp);
       fprintf(fp, "const int mem_no = %d;\n", dm->dm_cmajor);
}

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