* Copyright (c) 1992, 1993

/* $NetBSD: sem.c,v 1.87 2025/01/07 14:21:11 joe Exp $ */

/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratories.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: @(#)sem.c 8.1 (Berkeley) 6/6/93
*/

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

#include <sys/cdefs.h>
__RCSID("$NetBSD: sem.c,v 1.87 2025/01/07 14:21:11 joe Exp $");

#include <sys/param.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <util.h>
#include "defs.h"
#include "sem.h"

/*
* config semantics.
*/

#define NAMESIZE 100 /* local name buffers */

const char *s_ifnet; /* magic attribute */
const char *s_qmark;
const char *s_none;

static struct hashtab *cfhashtab; /* for config lookup */
struct hashtab *devitab; /* etc */
struct attr allattr;
size_t nattrs;

static struct attr errattr;
static struct devbase errdev;
static struct deva errdeva;

static int has_errobj(struct attrlist *, struct attr *);
static struct nvlist *addtoattr(struct nvlist *, struct devbase *);
static int resolve(struct nvlist **, const char *, const char *,
struct nvlist *, int);
static struct pspec *getpspec(struct attr *, struct devbase *, int, int);
static struct devi *newdevi(const char *, int, struct devbase *d);
static struct devi *getdevi(const char *);
static void remove_devi(struct devi *);
static const char *concat(const char *, int);
static char *extend(char *, const char *);
static int split(const char *, size_t, char *, size_t, int *);
static void selectbase(struct devbase *, struct deva *);
static const char **fixloc(const char *, struct attr *, struct loclist *);
static const char *makedevstr(devmajor_t, devminor_t);
static const char *major2name(devmajor_t);
static devmajor_t dev2major(struct devbase *);

extern const char *yyfile;
extern int vflag;

#define V_ATTRIBUTE 0
#define V_DEVICE 1
struct vtype {
int type;
struct attr *attr;
void *value;
};

static struct nvlist *
makedevstack(struct devbase *d)
{
struct devi *firsti, *i;
struct nvlist *stack = NULL;

for (firsti = d->d_ihead; firsti != NULL; firsti = firsti->i_bsame)
for (i = firsti; i != NULL; i = i->i_alias)
stack = newnv(NULL, NULL, i, 0, stack);
return stack;
}

static void
devcleanup(struct nvlist *stack)
{
struct nvlist *nv;
for (nv = stack; nv != NULL; nv = nv->nv_next)
remove_devi(nv->nv_ptr);
nvfreel(stack);
}

static void *
addvalue(int type, struct attr *a, void *value)
{
struct vtype *vt = emalloc(sizeof(*vt));
vt->type = type;
vt->attr = a;
vt->value = value;
return vt;
}

void
initsem(void)
{

attrtab = ht_new();
attrdeptab = ht_new();

allattr.a_name = "netbsd";
TAILQ_INIT(&allattr.a_files);
(void)ht_insert(attrtab, allattr.a_name, &allattr);
selectattr(&allattr);

errattr.a_name = "<internal>";

TAILQ_INIT(&allbases);

TAILQ_INIT(&alldevas);

TAILQ_INIT(&allpspecs);

cfhashtab = ht_new();
TAILQ_INIT(&allcf);

TAILQ_INIT(&alldevi);
errdev.d_name = "<internal>";

TAILQ_INIT(&allpseudo);

TAILQ_INIT(&alldevms);

s_ifnet = intern("ifnet");
s_qmark = intern("?");
s_none = intern("none");
}

/* Name of include file just ended (set in scan.l) */
extern const char *lastfile;

static struct attr *
finddep(struct attr *a, const char *name)
{
struct attrlist *al;

for (al = a->a_deps; al != NULL; al = al->al_next) {
struct attr *this = al->al_this;
if (strcmp(this->a_name, name) == 0)
return this;
}
return NULL;
}

static void
mergedeps(const char *dname, const char *name)
{
struct attr *a, *newa;

CFGDBG(4, "merging attr `%s' to devbase `%s'", name, dname);
a = refattr(dname);
if (finddep(a, name) == NULL) {
newa = refattr(name);
a->a_deps = attrlist_cons(a->a_deps, newa);
CFGDBG(3, "attr `%s' merged to attr `%s'", newa->a_name,
a->a_name);
}
}

static void
fixdev(struct devbase *dev)
{
struct attrlist *al;
struct attr *devattr, *a;

devattr = refattr(dev->d_name);
if (devattr->a_devclass)
panic("%s: dev %s is devclass!", __func__, devattr->a_name);

CFGDBG(4, "fixing devbase `%s'", dev->d_name);
for (al = dev->d_attrs; al != NULL; al = al->al_next) {
a = al->al_this;
CFGDBG(4, "fixing devbase `%s' attr `%s'", dev->d_name,
a->a_name);
if (a->a_iattr) {
a->a_refs = addtoattr(a->a_refs, dev);
CFGDBG(3, "device `%s' has iattr `%s'", dev->d_name,
a->a_name);
} else if (a->a_devclass != NULL) {
if (dev->d_classattr != NULL && dev->d_classattr != a) {
cfgwarn("device `%s' has multiple classes "
"(`%s' and `%s')",
dev->d_name, dev->d_classattr->a_name,
a->a_name);
}
if (dev->d_classattr == NULL) {
dev->d_classattr = a;
CFGDBG(3, "device `%s' is devclass `%s'",
dev->d_name, a->a_name);
}
} else {
if (strcmp(dev->d_name, a->a_name) != 0) {
mergedeps(dev->d_name, a->a_name);
}
}
}
}

void
enddefs(void)
{
struct devbase *dev;

yyfile = "enddefs";

TAILQ_FOREACH(dev, &allbases, d_next) {
if (!dev->d_isdef) {
(void)fprintf(stderr,
"%s: device `%s' used but not defined\n",
lastfile, dev->d_name);
errors++;
continue;
}
fixdev(dev);
}
if (errors) {
(void)fprintf(stderr, "*** Stop.\n");
exit(1);
}
}

void
setdefmaxusers(int min, int def, int max)
{

if (min < 1 || min > def || def > max)
cfgerror("maxusers must have 1 <= min (%d) <= default (%d) "
"<= max (%d)", min, def, max);
else {
minmaxusers = min;
defmaxusers = def;
maxmaxusers = max;
}
}

static const char *maxusers_srcfile;
static u_short maxusers_srcline;

void
setmaxusers(int n)
{

if (maxusers == n) {
cfgerror("duplicate maxusers parameter at %s:%hu",
maxusers_srcfile, maxusers_srcline);
return;
}
if (vflag && maxusers != 0)
cfgwarn("warning: maxusers already defined at %s:%hu",
maxusers_srcfile, maxusers_srcline);
maxusers = n;
maxusers_srcfile = yyfile;
maxusers_srcline = currentline();
if (n < minmaxusers) {
cfgerror("warning: minimum of %d maxusers assumed",
minmaxusers);
errors--; /* take it away */
maxusers = minmaxusers;
} else if (n > maxmaxusers) {
cfgerror("warning: maxusers (%d) > %d", n, maxmaxusers);
errors--;
}
}

void
setident(const char *i)
{

if (i)
ident = intern(i);
else
ident = NULL;
}

/*
* Define an attribute, optionally with an interface (a locator list)
* and a set of attribute-dependencies.
*
* Attribute dependencies MAY NOT be interface attributes.
*
* Since an empty locator list is logically different from "no interface",
* all locator lists include a dummy head node, which we discard here.
*/
int
defattr0(const char *name, struct loclist *locs, struct attrlist *deps,
int devclass)
{

if (locs != NULL)
return defiattr(name, locs, deps, devclass);
else if (devclass)
return defdevclass(name, locs, deps, devclass);
else
return defattr(name, locs, deps, devclass);
}

int
defattr(const char *name, struct loclist *locs, struct attrlist *deps,
int devclass)
{
struct attr *a, *dep;
struct attrlist *al;

if (getrefattr(name, &a)) {
cfgerror("attribute `%s' already defined at %s:%hu", name,
a->a_where.w_srcfile, a->a_where.w_srcline);
loclist_destroy(locs);
return (1);
}
if (a == NULL)
a = mkattr(name);

/*
* If this attribute depends on any others, make sure none of
* the dependencies are interface attributes.
*/
for (al = deps; al != NULL; al = al->al_next) {
dep = al->al_this;
if (dep->a_iattr) {
cfgerror("`%s' dependency `%s' is an interface "
"attribute", name, dep->a_name);
return (1);
}
(void)ht_insert2(attrdeptab, name, dep->a_name,
addvalue(V_ATTRIBUTE, a, dep));
CFGDBG(2, "attr `%s' depends on attr `%s'", name, dep->a_name);
}

a->a_deps = deps;
expandattr(a, NULL);
CFGDBG(3, "attr `%s' defined", a->a_name);

return (0);
}

struct attr *
mkattr(const char *name)
{
struct attr *a;

a = ecalloc(1, sizeof *a);
if (ht_insert(attrtab, name, a)) {
free(a);
return NULL;
}
a->a_name = name;
a->a_where.w_srcfile = yyfile;
a->a_where.w_srcline = currentline();
TAILQ_INIT(&a->a_files);
CFGDBG(3, "attr `%s' allocated", name);

return a;
}

/* "interface attribute" initialization */
int
defiattr(const char *name, struct loclist *locs, struct attrlist *deps,
int devclass)
{
struct attr *a;
int len;
struct loclist *ll;

if (devclass)
panic("%s: %s has both locators and devclass", __func__, name);

if (defattr(name, locs, deps, devclass) != 0)
return (1);

a = getattr(name);
a->a_iattr = 1;
/* unwrap */
a->a_locs = locs->ll_next;
locs->ll_next = NULL;
loclist_destroy(locs);
len = 0;
for (ll = a->a_locs; ll != NULL; ll = ll->ll_next)
len++;
a->a_loclen = len;
if (deps)
CFGDBG(2, "attr `%s' iface with deps", a->a_name);
return (0);
}

/* "device class" initialization */
int
defdevclass(const char *name, struct loclist *locs, struct attrlist *deps,
int devclass)
{
struct attr *a;
char classenum[256], *cp;
int errored = 0;

if (deps)
panic("%s: %s has both dependencies and devclass", __func__,
name);

if (defattr(name, locs, deps, devclass) != 0)
return (1);

a = getattr(name);
(void)snprintf(classenum, sizeof(classenum), "DV_%s", name);
for (cp = classenum + 3; *cp; cp++) {
if (!errored && (!isalnum((unsigned char)*cp) ||
(isalpha((unsigned char)*cp)
&& !islower((unsigned char)*cp)))) {
cfgerror("device class names must be "
"lower-case alphanumeric characters");
errored = 1;
}
*cp = (char)toupper((unsigned char)*cp);
}
a->a_devclass = intern(classenum);

return (0);
}

/*
* Return true if the given `error object' is embedded in the given
* pointer list.
*/
static int
has_errobj(struct attrlist *al, struct attr *obj)
{

for (; al != NULL; al = al->al_next)
if (al->al_this == obj)
return (1);
return (0);
}

/*
* Return true if the given attribute is embedded in the given
* pointer list.
*/
int
has_attr(struct attrlist *al, const char *attr)
{
struct attr *a;

if ((a = getattr(attr)) == NULL)
return (0);

for (; al != NULL; al = al->al_next)
if (al->al_this == a)
return (1);
return (0);
}

/*
* Add a device base to a list in an attribute (actually, to any list).
* Note that this does not check for duplicates, and does reverse the
* list order, but no one cares anyway.
*/
static struct nvlist *
addtoattr(struct nvlist *l, struct devbase *dev)
{
struct nvlist *n;

n = newnv(NULL, NULL, dev, 0, l);
return (n);
}

/*
* Define a device. This may (or may not) also define an interface
* attribute and/or refer to existing attributes.
*/
void
defdev(struct devbase *dev, struct loclist *loclist, struct attrlist *attrs,
int ispseudo)
{
struct loclist *ll;
struct attrlist *al;

if (dev == &errdev)
goto bad;
if (dev->d_isdef) {
cfgerror("redefinition of `%s' (previously defined at %s:%d)",
dev->d_name, dev->d_where.w_srcfile, dev->d_where.w_srcline);
goto bad;
}

dev->d_isdef = 1;
if (has_errobj(attrs, &errattr))
goto bad;

/*
* Handle implicit attribute definition from locator list. Do
* this before scanning the `at' list so that we can have, e.g.:
* device foo at other, foo { slot = -1 }
* (where you can plug in a foo-bus extender to a foo-bus).
*/
if (loclist != NULL) {
ll = loclist;
loclist = NULL; /* defattr disposes of them for us */
if (defiattr(dev->d_name, ll, NULL, 0))
goto bad;
attrs = attrlist_cons(attrs, getattr(dev->d_name));
/* This used to be stored but was never used */
/* attrs->al_name = dev->d_name; */
}

/*
* Pseudo-devices can have children. Consider them as
* attaching at root.
*/
if (ispseudo) {
for (al = attrs; al != NULL; al = al->al_next)
if (al->al_this->a_iattr)
break;
if (al != NULL) {
if (ispseudo < 2) {
if (version >= 20080610)
cfgerror("interface attribute on "
"non-device pseudo `%s'", dev->d_name);
else {
ispseudo = 2;
}
}
ht_insert(devroottab, dev->d_name, dev);
}
}

/* Committed! Set up fields. */
dev->d_ispseudo = ispseudo;
dev->d_attrs = attrs;
dev->d_classattr = NULL; /* for now */
CFGDBG(3, "dev `%s' defined", dev->d_name);

/*
* Implicit attribute definition for device.
*/
refattr(dev->d_name);

/*
* For each interface attribute this device refers to, add this
* device to its reference list. This makes, e.g., finding all
* "scsi"s easier.
*
* While looking through the attributes, set up the device
* class if any are devclass attributes (and error out if the
* device has two classes).
*/
for (al = attrs; al != NULL; al = al->al_next) {
/*
* Implicit attribute definition for device dependencies.
*/
refattr(al->al_this->a_name);
(void)ht_insert2(attrdeptab, dev->d_name, al->al_this->a_name,
addvalue(V_DEVICE, al->al_this, dev));
CFGDBG(2, "device `%s' depends on attr `%s'", dev->d_name,
al->al_this->a_name);
}
return;
bad:
loclist_destroy(loclist);
attrlist_destroyall(attrs);
}

/*
* Look up a devbase. Also makes sure it is a reasonable name,
* i.e., does not end in a digit or contain special characters.
*/
struct devbase *
getdevbase(const char *name)
{
const u_char *p;
struct devbase *dev;

p = (const u_char *)name;
if (!isalpha(*p))
goto badname;
while (*++p) {
if (!isalnum(*p) && *p != '_')
goto badname;
}
if (isdigit(*--p)) {
badname:
cfgerror("bad device base name `%s'", name);
return (&errdev);
}
dev = ht_lookup(devbasetab, name);
if (dev == NULL) {
dev = ecalloc(1, sizeof *dev);
dev->d_name = name;
dev->d_isdef = 0;
dev->d_major = NODEVMAJOR;
dev->d_attrs = NULL;
dev->d_ihead = NULL;
dev->d_ipp = &dev->d_ihead;
dev->d_ahead = NULL;
dev->d_app = &dev->d_ahead;
dev->d_umax = 0;
dev->d_where.w_srcfile = yyfile;
dev->d_where.w_srcline = currentline();
TAILQ_INSERT_TAIL(&allbases, dev, d_next);
if (ht_insert(devbasetab, name, dev))
panic("%s: Can't insert %s", __func__, name);
CFGDBG(3, "devbase defined `%s'", dev->d_name);
}
return (dev);
}

/*
* Define some of a device's allowable parent attachments.
* There may be a list of (plain) attributes.
*/
void
defdevattach(struct deva *deva, struct devbase *dev, struct nvlist *atlist,
struct attrlist *attrs)
{
struct nvlist *nv;
struct attrlist *al;
struct attr *a;

if (dev == &errdev)
goto bad;
if (deva == NULL)
deva = getdevattach(dev->d_name);
if (deva == &errdeva)
goto bad;
if (!dev->d_isdef) {
cfgerror("attaching undefined device `%s'", dev->d_name);
goto bad;
}
if (deva->d_isdef) {
cfgerror("redefinition of `%s' (previously defined at %s:%d)",
deva->d_name, deva->d_where.w_srcfile, deva->d_where.w_srcline);
goto bad;
}
if (dev->d_ispseudo) {
cfgerror("pseudo-devices can't attach");
goto bad;
}

deva->d_isdef = 1;
if (has_errobj(attrs, &errattr))
goto bad;
for (al = attrs; al != NULL; al = al->al_next) {
a = al->al_this;
if (a == &errattr)
continue; /* already complained */
if (a->a_iattr || a->a_devclass != NULL)
cfgerror("`%s' is not a plain attribute", a->a_name);
}

/* Committed! Set up fields. */
deva->d_attrs = attrs;
deva->d_atlist = atlist;
deva->d_devbase = dev;
CFGDBG(3, "deva `%s' defined", deva->d_name);

/*
* Implicit attribute definition for device attachment.
*/
refattr(deva->d_name);

/*
* Turn the `at' list into interface attributes (map each
* nv_name to an attribute, or to NULL for root), and add
* this device to those attributes, so that children can
* be listed at this particular device if they are supported
* by that attribute.
*/
for (nv = atlist; nv != NULL; nv = nv->nv_next) {
if (nv->nv_name == NULL)
nv->nv_ptr = a = NULL; /* at root */
else
nv->nv_ptr = a = getattr(nv->nv_name);
if (a == &errattr)
continue; /* already complained */

#if 0
/*
* Make sure that an attachment spec doesn't
* already say how to attach to this attribute.
*/
for (struct deva *da = dev->d_ahead; da; da = da->d_bsame)
if (onlist(da->d_atlist, a))
cfgerror("attach at `%s' already done by `%s'",
a ? a->a_name : "root", da->d_name);
#endif

if (a == NULL) {
ht_insert(devroottab, dev->d_name, dev);
continue; /* at root; don't add */
}
if (!a->a_iattr)
cfgerror("%s cannot be at plain attribute `%s'",
dev->d_name, a->a_name);
else
a->a_devs = addtoattr(a->a_devs, dev);
}

/* attach to parent */
*dev->d_app = deva;
dev->d_app = &deva->d_bsame;
return;
bad:
nvfreel(atlist);
attrlist_destroyall(attrs);
}

/*
* Look up a device attachment. Also makes sure it is a reasonable
* name, i.e., does not contain digits or special characters.
*/
struct deva *
getdevattach(const char *name)
{
const u_char *p;
struct deva *deva;

p = (const u_char *)name;
if (!isalpha(*p))
goto badname;
while (*++p) {
if (!isalnum(*p) && *p != '_')
goto badname;
}
if (isdigit(*--p)) {
badname:
cfgerror("bad device attachment name `%s'", name);
return (&errdeva);
}
deva = ht_lookup(devatab, name);
if (deva == NULL) {
deva = ecalloc(1, sizeof *deva);
deva->d_name = name;
deva->d_bsame = NULL;
deva->d_isdef = 0;
deva->d_devbase = NULL;
deva->d_atlist = NULL;
deva->d_attrs = NULL;
deva->d_ihead = NULL;
deva->d_ipp = &deva->d_ihead;
deva->d_where.w_srcfile = yyfile;
deva->d_where.w_srcline = currentline();
TAILQ_INSERT_TAIL(&alldevas, deva, d_next);
if (ht_insert(devatab, name, deva))
panic("%s: Can't insert %s", __func__, name);
}
return (deva);
}

/*
* Look up an attribute.
*/
struct attr *
getattr(const char *name)
{
struct attr *a;

if ((a = ht_lookup(attrtab, name)) == NULL) {
cfgerror("undefined attribute `%s'", name);
a = &errattr;
}
return (a);
}

/*
* Implicit attribute definition.
*/
struct attr *
refattr(const char *name)
{
struct attr *a;

if ((a = ht_lookup(attrtab, name)) == NULL)
a = mkattr(name);
return a;
}

int
getrefattr(const char *name, struct attr **ra)
{
struct attr *a;

a = ht_lookup(attrtab, name);
if (a == NULL) {
*ra = NULL;
return (0);
}
/*
* Check if the existing attr is only referenced, not really defined.
*/
*ra = a;
if (a->a_deps == NULL &&
a->a_iattr == 0 &&
a->a_devclass == 0) {
return (0);
}
return (1);
}

/*
* Recursively expand an attribute and its dependencies, checking for
* cycles, and invoking a callback for each attribute found.
*/
void
expandattr(struct attr *a, void (*callback)(struct attr *))
{
struct attrlist *al;
struct attr *dep;

if (a->a_expanding) {
cfgerror("circular dependency on attribute `%s'", a->a_name);
return;
}

a->a_expanding = 1;

/* First expand all of this attribute's dependencies. */
for (al = a->a_deps; al != NULL; al = al->al_next) {
dep = al->al_this;
expandattr(dep, callback);
}

/* ...and now invoke the callback for ourself. */
if (callback != NULL)
(*callback)(a);

a->a_expanding = 0;
}

/*
* Set the major device number for a device, so that it can be used
* as a root/dumps "on" device in a configuration.
*/
void
setmajor(struct devbase *d, devmajor_t n)
{

if (d != &errdev && d->d_major != NODEVMAJOR)
cfgerror("device `%s' is already major %d",
d->d_name, d->d_major);
else
d->d_major = n;
}

const char *
major2name(devmajor_t maj)
{
struct devbase *dev;
struct devm *dm;

if (!do_devsw) {
TAILQ_FOREACH(dev, &allbases, d_next) {
if (dev->d_major == maj)
return (dev->d_name);
}
} else {
TAILQ_FOREACH(dm, &alldevms, dm_next) {
if (dm->dm_bmajor == maj)
return (dm->dm_name);
}
}
return (NULL);
}

devmajor_t
dev2major(struct devbase *dev)
{
struct devm *dm;

if (!do_devsw)
return (dev->d_major);

TAILQ_FOREACH(dm, &alldevms, dm_next) {
if (strcmp(dm->dm_name, dev->d_name) == 0)
return (dm->dm_bmajor);
}
return (NODEVMAJOR);
}

/*
* Make a string description of the device at maj/min.
*/
static const char *
makedevstr(devmajor_t maj, devminor_t min)
{
const char *devicename;
char buf[32];

devicename = major2name(maj);
if (devicename == NULL)
(void)snprintf(buf, sizeof(buf), "<%d/%d>", maj, min);
else
(void)snprintf(buf, sizeof(buf), "%s%d%c", devicename,
min / maxpartitions, (min % maxpartitions) + 'a');

return (intern(buf));
}

/*
* Map things like "ra0b" => makedev(major("ra"), 0*maxpartitions + 'b'-'a').
* Handle the case where the device number is given but there is no
* corresponding name, and map NULL to the default.
*/
static int
resolve(struct nvlist **nvp, const char *name, const char *what,
struct nvlist *dflt, int part)
{
struct nvlist *nv;
struct devbase *dev;
const char *cp;
devmajor_t maj;
devminor_t min;
size_t l;
int unit;
char buf[NAMESIZE];

if ((part -= 'a') >= maxpartitions || part < 0)
panic("%s: Bad partition %c", __func__, part);
if ((nv = *nvp) == NULL) {
dev_t d = NODEV;
/*
* Apply default. Easiest to do this by number.
* Make sure to retain NODEVness, if this is dflt's disposition.
*/
if ((dev_t)dflt->nv_num != NODEV) {
maj = major(dflt->nv_num);
min = ((minor(dflt->nv_num) / maxpartitions) *
maxpartitions) + part;
d = makedev(maj, min);
cp = makedevstr(maj, min);
} else
cp = NULL;
*nvp = nv = newnv(NULL, cp, NULL, (long long)d, NULL);
}
if ((dev_t)nv->nv_num != NODEV) {
/*
* By the numbers. Find the appropriate major number
* to make a name.
*/
maj = major(nv->nv_num);
min = minor(nv->nv_num);
nv->nv_str = makedevstr(maj, min);
return (0);
}

if (nv->nv_str == NULL || nv->nv_str == s_qmark)
/*
* Wildcarded or unspecified; leave it as NODEV.
*/
return (0);

if (nv->nv_ptr != NULL && strcmp(nv->nv_ptr, "spec") == 0)
/*
* spec string, interpreted by kernel
*/
return (0);

/*
* The normal case: things like "ra2b". Check for partition
* suffix, remove it if there, and split into name ("ra") and
* unit (2).
*/
l = strlen(nv->nv_str);
cp = &nv->nv_str[l];
if (l > 1 && *--cp >= 'a' && *cp < 'a' + maxpartitions &&
isdigit((unsigned char)cp[-1])) {
l--;
part = *cp - 'a';
}
cp = nv->nv_str;
if (split(cp, l, buf, sizeof buf, &unit)) {
cfgerror("%s: invalid %s device name `%s'", name, what, cp);
return (1);
}
dev = ht_lookup(devbasetab, intern(buf));
if (dev == NULL) {
cfgerror("%s: device `%s' does not exist", name, buf);
return (1);
}

/*
* Check for the magic network interface attribute, and
* don't bother making a device number.
*/
if (has_attr(dev->d_attrs, s_ifnet)) {
nv->nv_num = (long long)NODEV;
nv->nv_ifunit = unit; /* XXX XXX XXX */
} else {
maj = dev2major(dev);
if (maj == NODEVMAJOR) {
cfgerror("%s: can't make %s device from `%s'",
name, what, nv->nv_str);
return (1);
}
nv->nv_num = (long long)makedev(maj, unit * maxpartitions + part);
}

nv->nv_name = dev->d_name;
return (0);
}

/*
* Add a completed configuration to the list.
*/
void
addconf(struct config *cf0)
{
struct config *cf;
const char *name;

name = cf0->cf_name;
if ((cf = ht_lookup(cfhashtab, name)) != NULL) {
cfgerror("configuration `%s' already defined %s:%hu", name,
cf->cf_where.w_srcfile, cf->cf_where.w_srcline);
goto bad;
}
cf = ecalloc(1, sizeof *cf);
if (ht_insert(cfhashtab, name, cf)) {
free(cf);
}
*cf = *cf0;
cf->cf_where.w_srcfile = yyfile;
cf->cf_where.w_srcline = currentline();

/*
* Resolve the root device.
*/
if (cf->cf_root == NULL) {
cfgerror("%s: no root device specified", name);
goto bad;
}
if (cf->cf_root && cf->cf_root->nv_str != s_qmark) {
struct nvlist *nv;
nv = cf->cf_root;
if (resolve(&cf->cf_root, name, "root", nv, 'a'))
goto bad;
}

/*
* Resolve the dump device.
*/
if (cf->cf_dump == NULL || cf->cf_dump->nv_str == s_qmark) {
/*
* Wildcarded dump device is equivalent to unspecified.
*/
cf->cf_dump = NULL;
} else if (cf->cf_dump->nv_str == s_none) {
/*
* Operator has requested that no dump device should be
* configured; do nothing.
*/
} else {
if (resolve(&cf->cf_dump, name, "dumps", cf->cf_dump, 'b'))
goto bad;
}

/* Wildcarded fstype is `unspecified'. */
if (cf->cf_fstype == s_qmark)
cf->cf_fstype = NULL;

TAILQ_INSERT_TAIL(&allcf, cf, cf_next);
return;
bad:
nvfreel(cf0->cf_root);
nvfreel(cf0->cf_dump);
}

void
setconf(struct nvlist **npp, const char *what, struct nvlist *v)
{

if (*npp != NULL) {
cfgerror("duplicate %s specification", what);
nvfreel(v);
} else
*npp = v;
}

void
delconf(const char *name, int nowarn)
{
struct config *cf;

CFGDBG(5, "deselecting config `%s'", name);
if (ht_lookup(cfhashtab, name) == NULL) {
if (!nowarn)
cfgerror("configuration `%s' undefined", name);
return;
}
(void)ht_remove(cfhashtab, name);

TAILQ_FOREACH(cf, &allcf, cf_next)
if (!strcmp(cf->cf_name, name))
break;
if (cf == NULL)
panic("%s: lost configuration for %s", __func__, name);

TAILQ_REMOVE(&allcf, cf, cf_next);
}

void
setfstype(const char **fstp, const char *v)
{

if (*fstp != NULL) {
cfgerror("multiple fstype specifications");
return;
}

if (v != s_qmark && OPT_FSOPT(v)) {
cfgerror("\"%s\" is not a configured file system", v);
return;
}

*fstp = v;
}

static struct devi *
newdevi(const char *name, int unit, struct devbase *d)
{
struct devi *i;

i = ecalloc(1, sizeof *i);
i->i_name = name;
i->i_unit = unit;
i->i_base = d;
i->i_bsame = NULL;
i->i_asame = NULL;
i->i_alias = NULL;
i->i_at = NULL;
i->i_pspec = NULL;
i->i_atdeva = NULL;
i->i_locs = NULL;
i->i_cfflags = 0;
i->i_where.w_srcline = currentline();
i->i_where.w_srcfile = yyfile;
i->i_active = DEVI_ORPHAN; /* Proper analysis comes later */
i->i_level = devilevel;
i->i_pseudoroot = 0;
i->i_where.w_srcfile = yyfile;
i->i_where.w_srcline = currentline();
if (unit >= d->d_umax)
d->d_umax = unit + 1;
return (i);
}

static struct attr *
finddevattr(const char *name, const char *at, struct devbase *ib,
struct devbase **ab, int *atunit)
{
const char *cp;
char atbuf[NAMESIZE];
struct attrlist *al;
struct attr *attr;

if (at == NULL) {
*ab = NULL;
*atunit = -1;
return &errattr; /* a convenient "empty" attr */
}
if (split(at, strlen(at), atbuf, sizeof atbuf, atunit)) {
cfgerror("invalid attachment name `%s'", at);
/* (void)getdevi(name); -- ??? */
return NULL;
}

/*
* Devices can attach to two types of things: Attributes,
* and other devices (which have the appropriate attributes
* to allow attachment).
*
* (1) If we're attached to an attribute, then we don't need
* look at the parent base device to see what attributes
* it has, and make sure that we can attach to them.
*
* (2) If we're attached to a real device (i.e. named in
* the config file), we want to remember that so that
* at cross-check time, if the device we're attached to
* is missing but other devices which also provide the
* attribute are present, we don't get a false "OK."
*
* (3) If the thing we're attached to is an attribute
* but is actually named in the config file, we still
* have to remember its devbase.
*/
cp = intern(atbuf);

/* Figure out parent's devbase, to satisfy case (3). */
*ab = ht_lookup(devbasetab, cp);

/* Find out if it's an attribute. */
attr = ht_lookup(attrtab, cp);

/* Make sure we're _really_ attached to the attr. Case (1). */
if (attr != NULL && onlist(attr->a_devs, ib))
return attr;

/*
* Else a real device, and not just an attribute. Case (2).
*
* Have to work a bit harder to see whether we have
* something like "tg0 at esp0" (where esp is merely
* not an attribute) or "tg0 at nonesuch0" (where
* nonesuch is not even a device).
*/
if (*ab == NULL) {
cfgerror("%s at %s: `%s' unknown", name, at, atbuf);
return NULL;
}

/*
* See if the named parent carries an attribute
* that allows it to supervise device ib.
*/
for (al = (*ab)->d_attrs; al != NULL; al = al->al_next) {
attr = al->al_this;
if (onlist(attr->a_devs, ib))
return attr;
}
cfgerror("`%s' cannot attach to `%s'", ib->d_name, atbuf);
return NULL;
}

/*
* Add the named device as attaching to the named attribute (or perhaps
* another device instead) plus unit number.
*/
void
adddev(const char *name, const char *at, struct loclist *loclist, int flags)
{
struct devi *i; /* the new instance */
struct pspec *p; /* and its pspec */
struct attr *attr; /* attribute that allows attach */
struct devbase *ib; /* i->i_base */
struct devbase *ab; /* not NULL => at another dev */
struct deva *iba; /* devbase attachment used */
struct deva *lastiba;
int atunit, first;

lastiba = NULL;
if ((i = getdevi(name)) == NULL)
goto bad;
ib = i->i_base;
attr = finddevattr(name, at, ib, &ab, &atunit);
if (attr == NULL) {
i->i_active = DEVI_BROKEN;
goto bad;
}

for (lastiba = ib->d_ahead; lastiba; lastiba = iba->d_bsame) {
for (iba = lastiba; iba != NULL; iba = iba->d_bsame)
if (onlist(iba->d_atlist,
attr == &errattr ? NULL : attr))
break;

first = lastiba == ib->d_ahead;
if (iba == NULL) {
if (!first)
goto bad;
if (attr != &errattr) {
panic("%s: can't figure out attachment",
__func__);
} else {
cfgerror("`%s' cannot attach to the root",
ib->d_name);
i->i_active = DEVI_BROKEN;
}
}
// get a new one if it is not the first time
if (!first && (i = getdevi(name)) == NULL)
goto bad;

if (attr != &errattr) {
/*
* Find the parent spec. If a matching one has not
* yet been created, create one.
*
* XXX: This creates multiple pspecs that look the
* same in the config file and could be merged.
*/
p = getpspec(attr, ab, atunit, first);
p->p_devs = newnv(NULL, NULL, i, 0, p->p_devs);
} else
p = NULL;

if ((i->i_locs = fixloc(name, attr, loclist)) == NULL) {
i->i_active = DEVI_BROKEN;
goto bad;
}
i->i_at = at;
i->i_pspec = p;
i->i_atdeva = iba;
i->i_cfflags = flags;
CFGDBG(3, "devi `%s' at '%s' added", i->i_name, iba->d_name);

*iba->d_ipp = i;
iba->d_ipp = &i->i_asame;
}

/* all done, fall into ... */
bad:
loclist_destroy(loclist);
return;
}

void
deldevi(const char *name, const char *at, int nowarn)
{
struct devi *firsti, *i;
struct devbase *d;
int unit;
char base[NAMESIZE];

CFGDBG(5, "deselecting devi `%s'", name);
if (split(name, strlen(name), base, sizeof base, &unit)) {
if (!nowarn) {
cfgerror("invalid device name `%s'", name);
return;
}
}
d = ht_lookup(devbasetab, intern(base));
if (d == NULL) {
if (!nowarn)
cfgerror("%s: unknown device `%s'", name, base);
return;
}
if (d->d_ispseudo) {
cfgerror("%s: %s is a pseudo-device", name, base);
return;
}
if ((firsti = ht_lookup(devitab, name)) == NULL) {
cfgerror("`%s' not defined", name);
return;
}
if (at == NULL && firsti->i_at == NULL) {
/* 'at root' */
remove_devi(firsti);
return;
} else if (at != NULL)
for (i = firsti; i != NULL; i = i->i_alias)
if (i->i_active != DEVI_BROKEN &&
strcmp(at, i->i_at) == 0) {
remove_devi(i);
return;
}
cfgerror("`%s' at `%s' not found", name, at ? at : "root");
}

static void
remove_pspec(struct devi *i)
{
struct pspec *p = i->i_pspec;
struct nvlist *nv, *onv;

if (p == NULL)
return;

/* Double-linked nvlist anyone? */
for (nv = p->p_devs; nv->nv_next != NULL; nv = nv->nv_next) {
if (nv->nv_next && nv->nv_next->nv_ptr == i) {
onv = nv->nv_next;
nv->nv_next = onv->nv_next;
nvfree(onv);
break;
}
if (nv->nv_ptr == i) {
/* nv is p->p_devs in that case */
p->p_devs = nv->nv_next;
nvfree(nv);
break;
}
}
if (p->p_devs == NULL)
TAILQ_REMOVE(&allpspecs, p, p_list);
}

static void
remove_devi(struct devi *i)
{
struct devbase *d = i->i_base;
struct devi *f, *j, **ppi;
struct deva *iba;

CFGDBG(5, "removing devi `%s'", i->i_name);
f = ht_lookup(devitab, i->i_name);
if (f == NULL)
panic("%s: instance %s disappeared from devitab", __func__,
i->i_name);

if (i->i_active == DEVI_BROKEN) {
cfgerror("not removing broken instance `%s'", i->i_name);
return;
}

/*
* We have the device instance, i.
* We have to:
* - delete the alias
*
* If the devi was an alias of an already listed devi, all is
* good we don't have to do more.
* If it was the first alias, we have to replace i's entry in
* d's list by its first alias.
* If it was the only entry, we must remove i's entry from d's
* list.
*/
if (i != f) {
for (j = f; j->i_alias != i; j = j->i_alias)
continue;
j->i_alias = i->i_alias;
} else {
if (i->i_alias == NULL) {
/* No alias, must unlink the entry from devitab */
ht_remove(devitab, i->i_name);
j = i->i_bsame;
} else {
/* Or have the first alias replace i in d's list */
i->i_alias->i_bsame = i->i_bsame;
j = i->i_alias;
if (i == f)
ht_replace(devitab, i->i_name, i->i_alias);
}

/*
* - remove/replace the instance from the devbase's list
*
* A double-linked list would make this much easier. Oh, well,
* what is done is done.
*/
for (ppi = &d->d_ihead;
*ppi != NULL && *ppi != i && (*ppi)->i_bsame != i;
ppi = &(*ppi)->i_bsame)
continue;
if (*ppi == NULL)
panic("%s: dev (%s) doesn't list the devi (%s at %s)",
__func__, d->d_name, i->i_name, i->i_at);
f = *ppi;
if (f == i)
/* That implies d->d_ihead == i */
*ppi = j;
else
(*ppi)->i_bsame = j;
if (d->d_ipp == &i->i_bsame) {
if (i->i_alias == NULL) {
if (f == i)
d->d_ipp = &d->d_ihead;
else
d->d_ipp = &f->i_bsame;
} else
d->d_ipp = &i->i_alias->i_bsame;
}
}
/*
* - delete the attachment instance
*/
iba = i->i_atdeva;
for (ppi = &iba->d_ihead;
*ppi != NULL && *ppi != i && (*ppi)->i_asame != i;
ppi = &(*ppi)->i_asame)
continue;
if (*ppi == NULL)
panic("%s: deva (%s) doesn't list the devi (%s)", __func__,
iba->d_name, i->i_name);
f = *ppi;
if (f == i)
/* That implies iba->d_ihead == i */
*ppi = i->i_asame;
else
(*ppi)->i_asame = i->i_asame;
if (iba->d_ipp == &i->i_asame) {
if (f == i)
iba->d_ipp = &iba->d_ihead;
else
iba->d_ipp = &f->i_asame;
}
/*
* - delete the pspec
*/
remove_pspec(i);

/*
* - delete the alldevi entry
*/
TAILQ_REMOVE(&alldevi, i, i_next);
ndevi--;
/*
* Put it in deaddevitab
*
* Each time a devi is removed, devilevel is increased so that later on
* it is possible to tell if an instance was added before or after the
* removal of its parent.
*
* For active instances, i_level contains the number of devi removed so
* far, and for dead devis, it contains its index.
*/
i->i_level = devilevel++;
i->i_alias = NULL;
f = ht_lookup(deaddevitab, i->i_name);
if (f == NULL) {
if (ht_insert(deaddevitab, i->i_name, i))
panic("%s: can't add %s to deaddevitab", __func__,
i->i_name);
} else {
for (j = f; j->i_alias != NULL; j = j->i_alias)
continue;
j->i_alias = i;
}
/*
* - reconstruct d->d_umax
*/
d->d_umax = 0;
for (i = d->d_ihead; i != NULL; i = i->i_bsame)
if (i->i_unit >= d->d_umax)
d->d_umax = i->i_unit + 1;
}

void
deldeva(const char *at, int nowarn)
{
int unit;
const char *cp;
struct devbase *d, *ad;
struct devi *i, *j;
struct attr *a;
struct pspec *p;
struct nvlist *nv, *stack = NULL;

if (at == NULL) {
TAILQ_FOREACH(i, &alldevi, i_next)
if (i->i_at == NULL)
stack = newnv(NULL, NULL, i, 0, stack);
} else {
size_t l;

CFGDBG(5, "deselecting deva `%s'", at);
if (at[0] == '\0')
goto out;

l = strlen(at) - 1;
if (at[l] == '?' || isdigit((unsigned char)at[l])) {
char base[NAMESIZE];

if (split(at, l+1, base, sizeof base, &unit)) {
out:
cfgerror("invalid attachment name `%s'", at);
return;
}
cp = intern(base);
} else {
cp = intern(at);
unit = STAR;
}

ad = ht_lookup(devbasetab, cp);
a = ht_lookup(attrtab, cp);
if (a == NULL) {
cfgerror("unknown attachment attribute or device `%s'",
cp);
return;
}
if (!a->a_iattr) {
cfgerror("plain attribute `%s' cannot have children",
a->a_name);
return;
}

/*
* remove_devi() makes changes to the devbase's list and the
* alias list, * so the actual deletion of the instances must
* be delayed.
*/
for (nv = a->a_devs; nv != NULL; nv = nv->nv_next) {
d = nv->nv_ptr;
for (i = d->d_ihead; i != NULL; i = i->i_bsame)
for (j = i; j != NULL; j = j->i_alias) {
/* Ignore devices at root */
if (j->i_at == NULL)
continue;
p = j->i_pspec;
/*
* There are three cases:
*
* 1. unit is not STAR. Consider 'at'
* to be explicit, even if it
* references an interface
* attribute.
*
* 2. unit is STAR and 'at' references
* a real device. Look for pspec
* that have a matching p_atdev
* field.
*
* 3. unit is STAR and 'at' references
* an interface attribute. Look
* for pspec that have a matching
* p_iattr field.
*/
if ((unit != STAR && /* Case */
!strcmp(j->i_at, at)) || /* 1 */
(unit == STAR &&
((ad != NULL && /* Case */
p->p_atdev == ad) || /* 2 */
(ad == NULL && /* Case */
p->p_iattr == a)))) /* 3 */
stack = newnv(NULL, NULL, j, 0,
stack);
}
}
}

devcleanup(stack);
}

void
deldev(const char *name, int nowarn)
{
size_t l;
struct devi *firsti, *i;
struct nvlist *stack = NULL;

CFGDBG(5, "deselecting dev `%s'", name);
if (name[0] == '\0')
goto out;

l = strlen(name) - 1;
if (name[l] == '*' || isdigit((unsigned char)name[l])) {
/* `no mydev0' or `no mydev*' */
firsti = ht_lookup(devitab, name);
if (firsti == NULL) {
out:
if (!nowarn)
cfgerror("unknown instance %s", name);
return;
}
for (i = firsti; i != NULL; i = i->i_alias)
stack = newnv(NULL, NULL, i, 0, stack);
} else {
struct devbase *d = ht_lookup(devbasetab, name);

if (d == NULL) {
cfgerror("unknown device %s", name);
return;
}
if (d->d_ispseudo) {
cfgerror("%s is a pseudo-device; "
"use \"no pseudo-device %s\" instead", name,
name);
return;
}
stack = makedevstack(d);
}

devcleanup(stack);
}

/*
* Insert given device "name" into devroottab. In case "name"
* designates a pure interface attribute, create a fake device
* instance for the attribute and insert that into the roottab
* (this scheme avoids mucking around with the orphanage analysis).
*/
void
addpseudoroot(const char *name)
{
char buf[NAMESIZE];
int unit;
struct attr *attr;
struct devi *i;
struct deva *iba;
struct devbase *ib;

if (split(name, strlen(name), buf, sizeof(buf), &unit)) {
cfgerror("invalid pseudo-root name `%s'", name);
return;
}

/*
* Prefer device because devices with locators define an
* implicit interface attribute. However, if a device is
* not available, try to attach to the interface attribute.
* This makes sure adddev() doesn't get confused when we
* are really attaching to a device (alternatively we maybe
* could specify a non-NULL atlist to defdevattach() below).
*/
ib = ht_lookup(devbasetab, intern(buf));
if (ib == NULL) {
struct devbase *fakedev;
char fakename[NAMESIZE];

attr = ht_lookup(attrtab, intern(buf));
if (!(attr && attr->a_iattr)) {
cfgerror("pseudo-root `%s' not available", name);
return;
}

/*
* here we cheat a bit: create a fake devbase with the
* interface attribute and instantiate it. quick, cheap,
* dirty & bad for you, much like the stuff in the fridge.
* and, it works, since the pseudoroot device is not included
* in ioconf, just used by config to make sure we start from
* the right place.
*/
snprintf(fakename, sizeof(fakename), "%s_devattrs", buf);
fakedev = getdevbase(intern(fakename));
fakedev->d_isdef = 1;
fakedev->d_ispseudo = 0;
fakedev->d_attrs = attrlist_cons(NULL, attr);
defdevattach(NULL, fakedev, NULL, NULL);

if (unit == STAR)
snprintf(buf, sizeof(buf), "%s*", fakename);
else
snprintf(buf, sizeof(buf), "%s%d", fakename, unit);
name = buf;
}

/* ok, everything should be set up, so instantiate a fake device */
i = getdevi(name);
if (i == NULL)
panic("%s: device `%s' expected to be present", __func__,
name);
ib = i->i_base;
iba = ib->d_ahead;

i->i_atdeva = iba;
i->i_cfflags = 0;
i->i_locs = fixloc(name, &errattr, NULL);
i->i_pseudoroot = 1;
i->i_active = DEVI_ORPHAN; /* set active by kill_orphans() */

*iba->d_ipp = i;
iba->d_ipp = &i->i_asame;

ht_insert(devroottab, ib->d_name, ib);
}

static void
deldevbase(struct devbase *d)
{
struct devi *i;
const char *name = d->d_name;

if (!d->d_ispseudo) {
devcleanup(makedevstack(d));
return;
}

if ((i = ht_lookup(devitab, name)) == NULL)
return;

d->d_umax = 0; /* clear neads-count entries */
d->d_ihead = NULL; /* make sure it won't be considered active */
TAILQ_REMOVE(&allpseudo, i, i_next);
if (ht_remove(devitab, name))
panic("%s: Can't remove %s from devitab", __func__, name);
if (ht_insert(deaddevitab, name, i))
panic("%s: Can't add %s to deaddevitab", __func__, name);
}

void
addpseudo(const char *name, int number)
{
struct devbase *d;
struct devi *i;

d = ht_lookup(devbasetab, name);
if (d == NULL) {
cfgerror("undefined pseudo-device %s", name);
return;
}
if (!d->d_ispseudo) {
cfgerror("%s is a real device, not a pseudo-device", name);
return;
}
if ((i = ht_lookup(devitab, name)) != NULL) {
cfgerror("`%s' already defined at %s:%hu", name,
i->i_where.w_srcfile, i->i_where.w_srcline);
return;
}
i = newdevi(name, number - 1, d); /* foo 16 => "foo0..foo15" */
if (ht_insert(devitab, name, i))
panic("%s: %s", __func__, name);
/* Useful to retrieve the instance from the devbase */
d->d_ihead = i;
i->i_active = DEVI_ACTIVE;
TAILQ_INSERT_TAIL(&allpseudo, i, i_next);
}

void
delpseudo(const char *name, int nowarn)
{
struct devbase *d;

CFGDBG(5, "deselecting pseudo `%s'", name);
d = ht_lookup(devbasetab, name);
if (d == NULL) {
if (!nowarn)
cfgerror("undefined pseudo-device %s", name);
return;
}
if (!d->d_ispseudo) {
cfgerror("%s is a real device, not a pseudo-device", name);
return;
}
deldevbase(d);
}

void
adddevm(const char *name, devmajor_t cmajor, devmajor_t bmajor,
struct condexpr *cond, struct nvlist *nv_nodes)
{
struct devm *dm;

if (cmajor != NODEVMAJOR && (cmajor < 0 || cmajor >= 4096)) {
cfgerror("character major %d is invalid", cmajor);
condexpr_destroy(cond);
nvfreel(nv_nodes);
return;
}

if (bmajor != NODEVMAJOR && (bmajor < 0 || bmajor >= 4096)) {
cfgerror("block major %d is invalid", bmajor);
condexpr_destroy(cond);
nvfreel(nv_nodes);
return;
}
if (cmajor == NODEVMAJOR && bmajor == NODEVMAJOR) {
cfgerror("both character/block majors are not specified");
condexpr_destroy(cond);
nvfreel(nv_nodes);
return;
}

dm = ecalloc(1, sizeof(*dm));
dm->dm_where.w_srcfile = yyfile;
dm->dm_where.w_srcline = currentline();
dm->dm_name = name;
dm->dm_cmajor = cmajor;
dm->dm_bmajor = bmajor;
dm->dm_opts = cond;
dm->dm_devnodes = nv_nodes;

TAILQ_INSERT_TAIL(&alldevms, dm, dm_next);

maxcdevm = MAX(maxcdevm, dm->dm_cmajor);
maxbdevm = MAX(maxbdevm, dm->dm_bmajor);
}

int
fixdevis(void)
{
const char *msg;
struct devi *i;
struct pspec *p;
int error = 0;

TAILQ_FOREACH(i, &alldevi, i_next) {
CFGDBG(3, "fixing devis `%s'", i->i_name);
if (i->i_active == DEVI_ACTIVE)
selectbase(i->i_base, i->i_atdeva);
else if (i->i_active == DEVI_ORPHAN) {
/*
* At this point, we can't have instances for which
* i_at or i_pspec are NULL.
*/
++error;
p = i->i_pspec;
msg = p == NULL ? "no parent" :
(p->p_atunit == WILD ? "nothing matching" : "no");
cfgxerror(i->i_where.w_srcfile, i->i_where.w_srcline,
"`%s at %s' is orphaned (%s `%s' found)",
i->i_name, i->i_at, msg, i->i_at);
} else if (vflag && i->i_active == DEVI_IGNORED)
cfgxwarn(i->i_where.w_srcfile, i->i_where.w_srcline, "ignoring "
"explicitly orphaned instance `%s at %s'",
i->i_name, i->i_at);
}

if (error)
return error;

TAILQ_FOREACH(i, &allpseudo, i_next)
if (i->i_active == DEVI_ACTIVE)
selectbase(i->i_base, NULL);
return 0;
}

/*
* Look up a parent spec, creating a new one if it does not exist.
*/
static struct pspec *
getpspec(struct attr *attr, struct devbase *ab, int atunit, int first)
{
struct pspec *p;
int inst = npspecs;
int ref = 1;

TAILQ_FOREACH(p, &allpspecs, p_list) {
if (p->p_iattr == attr && p->p_atdev == ab &&
p->p_atunit == atunit) {
p->p_ref++;
if (first)
return p;
else {
inst = p->p_inst;
ref = p->p_ref;
}

}
}

p = ecalloc(1, sizeof(*p));

p->p_iattr = attr;
p->p_atdev = ab;
p->p_atunit = atunit;
p->p_inst = inst;
if (inst == npspecs)
npspecs++;
p->p_active = 0;
p->p_ref = ref;

TAILQ_INSERT_TAIL(&allpspecs, p, p_list);

return (p);
}

/*
* Define a new instance of a specific device.
*/
static struct devi *
getdevi(const char *name)
{
struct devi *i, *firsti;
struct devbase *d;
int unit;
char base[NAMESIZE];

if (split(name, strlen(name), base, sizeof base, &unit)) {
cfgerror("invalid device name `%s'", name);
return (NULL);
}
d = ht_lookup(devbasetab, intern(base));
if (d == NULL) {
cfgerror("%s: unknown device `%s'", name, base);
return (NULL);
}
if (d->d_ispseudo) {
cfgerror("%s: %s is a pseudo-device", name, base);
return (NULL);
}
firsti = ht_lookup(devitab, name);
i = newdevi(name, unit, d);
if (firsti == NULL) {
if (ht_insert(devitab, name, i))
panic("%s: %s", __func__, name);
*d->d_ipp = i;
d->d_ipp = &i->i_bsame;
} else {
while (firsti->i_alias)
firsti = firsti->i_alias;
firsti->i_alias = i;
}
TAILQ_INSERT_TAIL(&alldevi, i, i_next);
ndevi++;
return (i);
}

static const char *
concat(const char *name, int c)
{
size_t len;
char buf[NAMESIZE];

len = strlen(name);
if (len + 2 > sizeof(buf)) {
cfgerror("device name `%s%c' too long", name, c);
len = sizeof(buf) - 2;
}
memmove(buf, name, len);
buf[len] = (char)c;
buf[len + 1] = '\0';
return (intern(buf));
}

const char *
starref(const char *name)
{

return (concat(name, '*'));
}

const char *
wildref(const char *name)
{

return (concat(name, '?'));
}

/*
* Split a name like "foo0" into base name (foo) and unit number (0).
* Return 0 on success. To make this useful for names like "foo0a",
* the length of the "foo0" part is one of the arguments.
*/
static int
split(const char *name, size_t nlen, char *base, size_t bsize, int *aunit)
{
const char *cp;
int c;
size_t l;

l = nlen;
if (l < 2 || l >= bsize || isdigit((unsigned char)*name))
return (1);
c = (u_char)name[--l];
if (!isdigit(c)) {
if (c == '*')
*aunit = STAR;
else if (c == '?')
*aunit = WILD;
else
return (1);
} else {
cp = &name[l];
while (isdigit((unsigned char)cp[-1]))
l--, cp--;
*aunit = atoi(cp);
}
memmove(base, name, l);
base[l] = 0;
return (0);
}

void
addattr(const char *name)
{
struct attr *a;

a = refattr(name);
selectattr(a);
}

void
delattr(const char *name, int nowarn)
{
struct attr *a;

a = refattr(name);
deselectattr(a);
}

void
selectattr(struct attr *a)
{
struct attrlist *al;
struct attr *dep;

CFGDBG(5, "selecting attr `%s'", a->a_name);
for (al = a->a_deps; al != NULL; al = al->al_next) {
dep = al->al_this;
selectattr(dep);
}
if (ht_insert(selecttab, a->a_name, __UNCONST(a->a_name)) == 0)
nattrs++;
CFGDBG(3, "attr selected `%s'", a->a_name);
}

static int
deselectattrcb2(const char *name1, const char *name2, void *v, void *arg)
{
struct attr *a = arg;
const char *name = a->a_name;
struct vtype *vt = v;

if (strcmp(name, name2) == 0) {
delattr(name1, 0);
return 0;
}

if (!vt->attr->a_deselected)
return 0;

switch (vt->type) {
case V_ATTRIBUTE:
#ifdef notyet
// XXX: Loops
deselectattr(vt->value);
#endif
break;
case V_DEVICE:
CFGDBG(5, "removing device `%s' with attr `%s' because attr `%s'"
" is deselected", name1, name2, name);
deldevbase(vt->value);
break;
default:
abort();
}
return 0;
}

void
deselectattr(struct attr *a)
{
CFGDBG(5, "deselecting attr `%s'", a->a_name);
a->a_deselected = 1;
ht_enumerate2(attrdeptab, deselectattrcb2, a);
if (ht_remove(selecttab, a->a_name) == 0)
nattrs--;
CFGDBG(3, "attr deselected `%s'", a->a_name);
}

static int
dumpattrdepcb2(const char *name1, const char *name2, void *v, void *arg)
{

CFGDBG(3, "attr `%s' depends on attr `%s'", name1, name2);
return 0;
}

void
dependattrs(void)
{

ht_enumerate2(attrdeptab, dumpattrdepcb2, NULL);
}

/*
* We have an instance of the base foo, so select it and all its
* attributes for "optional foo".
*/
static void
selectbase(struct devbase *d, struct deva *da)
{
struct attr *a;
struct attrlist *al;

(void)ht_insert(selecttab, d->d_name, __UNCONST(d->d_name));
CFGDBG(3, "devbase selected `%s'", d->d_name);
CFGDBG(5, "selecting dependencies of devbase `%s'", d->d_name);
for (al = d->d_attrs; al != NULL; al = al->al_next) {
a = al->al_this;
expandattr(a, selectattr);
}

struct attr *devattr;
devattr = refattr(d->d_name);
expandattr(devattr, selectattr);

if (da != NULL) {
(void)ht_insert(selecttab, da->d_name, __UNCONST(da->d_name));
CFGDBG(3, "devattr selected `%s'", da->d_name);
for (al = da->d_attrs; al != NULL; al = al->al_next) {
a = al->al_this;
expandattr(a, selectattr);
}
}

fixdev(d);
}

/*
* Is the given pointer on the given list of pointers?
*/
int
onlist(struct nvlist *nv, void *ptr)
{
for (; nv != NULL; nv = nv->nv_next)
if (nv->nv_ptr == ptr)
return (1);
return (0);
}

static char *
extend(char *p, const char *name)
{
size_t l;

l = strlen(name);
memmove(p, name, l);
p += l;
*p++ = ',';
*p++ = ' ';
return (p);
}

/*
* Check that we got all required locators, and default any that are
* given as "?" and have defaults. Return 0 on success.
*/
static const char **
fixloc(const char *name, struct attr *attr, struct loclist *got)
{
struct loclist *m, *n;
int ord;
const char **lp;
int nmissing, nextra, nnodefault;
char *mp, *ep, *ndp;
char missing[1000], extra[1000], nodefault[1000];
static const char *nullvec[1];

/*
* Look for all required locators, and number the given ones
* according to the required order. While we are numbering,
* set default values for defaulted locators.
*/
if (attr->a_loclen == 0) /* e.g., "at root" */
lp = nullvec;
else
lp = emalloc((size_t)(attr->a_loclen + 1) * sizeof(const char *));
for (n = got; n != NULL; n = n->ll_next)
n->ll_num = -1;
nmissing = 0;
mp = missing;
/* yes, this is O(mn), but m and n should be small */
for (ord = 0, m = attr->a_locs; m != NULL; m = m->ll_next, ord++) {
for (n = got; n != NULL; n = n->ll_next) {
if (n->ll_name == m->ll_name) {
n->ll_num = ord;
break;
}
}
if (n == NULL && m->ll_num == 0) {
nmissing++;
mp = extend(mp, m->ll_name);
}
lp[ord] = m->ll_string;
}
if (ord != attr->a_loclen)
panic("%s: bad length", __func__);
lp[ord] = NULL;
nextra = 0;
ep = extra;
nnodefault = 0;
ndp = nodefault;
for (n = got; n != NULL; n = n->ll_next) {
if (n->ll_num >= 0) {
if (n->ll_string != NULL)
lp[n->ll_num] = n->ll_string;
else if (lp[n->ll_num] == NULL) {
nnodefault++;
ndp = extend(ndp, n->ll_name);
}
} else {
nextra++;
ep = extend(ep, n->ll_name);
}
}
if (nextra) {
ep[-2] = 0; /* kill ", " */
cfgerror("%s: extraneous locator%s: %s",
name, nextra > 1 ? "s" : "", extra);
}
if (nmissing) {
mp[-2] = 0;
cfgerror("%s: must specify %s", name, missing);
}
if (nnodefault) {
ndp[-2] = 0;
cfgerror("%s: cannot wildcard %s", name, nodefault);
}
if (nmissing || nnodefault) {
free(lp);
lp = NULL;
}
return (lp);
}

void
setversion(int newver)
{
if (newver > CONFIG_VERSION)
cfgerror("your sources require a newer version of config(1) "
"-- please rebuild it.");
else if (newver < CONFIG_MINVERSION)
cfgerror("your sources are out of date -- please update.");
else
version = newver;
}