OpenBSD-4.6/usr.sbin/config/sem.c
/* $OpenBSD: sem.c,v 1.31 2008/03/24 21:35:03 maja Exp $ */
/* $NetBSD: sem.c,v 1.10 1996/11/11 23:40:11 gwr 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
*/
#include <sys/param.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include "config.h"
#include "sem.h"
/*
* config semantics.
*/
#define NAMESIZE 100 /* local name buffers */
const char *s_generic;
const char *s_nfs;
static struct hashtab *attrtab; /* for attribute lookup */
static struct hashtab *cfhashtab; /* for config lookup */
static struct hashtab *devitab; /* etc */
static struct attr errattr;
static struct devbase errdev;
static struct deva errdeva;
static struct devbase **nextbase;
static struct deva **nextdeva;
static struct config **nextcf;
static struct devi **nextdevi;
static struct devi **nextpseudo;
static int has_errobj(struct nvlist *, void *);
static struct nvlist *addtoattr(struct nvlist *, struct devbase *);
static int exclude(struct nvlist *, const char *, const char *);
static int resolve(struct nvlist **, const char *, const char *,
struct nvlist *, int);
static int lresolve(struct nvlist **, const char *, const char *,
struct nvlist *, int);
static struct devi *newdevi(const char *, int, struct devbase *d);
static struct devi *getdevi(const char *);
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 int onlist(struct nvlist *, void *);
static const char **fixloc(const char *, struct attr *, struct nvlist *);
void
initsem(void)
{
attrtab = ht_new();
errattr.a_name = "<internal>";
allbases = NULL;
nextbase = &allbases;
alldevas = NULL;
nextdeva = &alldevas;
cfhashtab = ht_new();
allcf = NULL;
nextcf = &allcf;
devitab = ht_new();
alldevi = NULL;
nextdevi = &alldevi;
errdev.d_name = "<internal>";
allpseudo = NULL;
nextpseudo = &allpseudo;
s_generic = intern("generic");
s_nfs = intern("nfs");
}
/* Name of include file just ended (set in scan.l) */
extern const char *lastfile;
void
enddefs(void)
{
struct devbase *dev;
for (dev = allbases; dev != NULL; dev = dev->d_next) {
if (!dev->d_isdef) {
(void)fprintf(stderr,
"%s: device `%s' used but not defined\n",
lastfile, dev->d_name);
errors++;
continue;
}
}
if (errors) {
(void)fprintf(stderr, "*** Stop.\n");
exit(1);
}
}
void
setdefmaxusers(int min, int def, int max)
{
if (min < 1 || min > def || def > max)
error("maxusers must have 1 <= min <= default <= max");
else {
minmaxusers = min;
defmaxusers = def;
maxmaxusers = max;
}
}
void
setmaxusers(int n)
{
if (maxusers != 0) {
warnx("warning: duplicate maxusers parameter, will use latest definition (%d)", n);
}
maxusers = n;
if (n < minmaxusers) {
warnx("warning: minimum of %d maxusers assumed", minmaxusers);
maxusers = minmaxusers;
} else if (n > maxmaxusers) {
warnx("warning: maxusers (%d) > %d", n, maxmaxusers);
}
}
/*
* Define an attribute, optionally with an interface (a locator list).
* Since an empty locator list is logically different from "no interface",
* all locator lists include a dummy head node, which we discard here.
*/
int
defattr(const char *name, struct nvlist *locs)
{
struct attr *a;
struct nvlist *nv;
int len;
a = emalloc(sizeof *a);
if (ht_insert(attrtab, name, a)) {
free(a);
error("attribute `%s' already defined", name);
nvfreel(locs);
return (1);
}
a->a_name = name;
if (locs != NULL) {
a->a_iattr = 1;
a->a_locs = locs->nv_next;
nvfree(locs);
} else {
a->a_iattr = 0;
a->a_locs = NULL;
}
len = 0;
for (nv = a->a_locs; nv != NULL; nv = nv->nv_next)
len++;
a->a_loclen = len;
a->a_devs = NULL;
a->a_refs = NULL;
return (0);
}
/*
* Return true if the given `error object' is embedded in the given
* pointer list.
*/
static int
has_errobj(struct nvlist *nv, void *obj)
{
for (; nv != NULL; nv = nv->nv_next)
if (nv->nv_ptr == obj)
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, int ispseudo, struct nvlist *loclist,
struct nvlist *attrs)
{
struct nvlist *nv;
struct attr *a;
if (dev == &errdev)
goto bad;
if (dev->d_isdef) {
error("redefinition of `%s'", dev->d_name);
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) {
nv = loclist;
loclist = NULL; /* defattr disposes of them for us */
if (defattr(dev->d_name, nv))
goto bad;
attrs = newnv(dev->d_name, NULL, getattr(dev->d_name), 0,
attrs);
}
/* Committed! Set up fields. */
dev->d_ispseudo = ispseudo;
dev->d_attrs = attrs;
/*
* For each interface attribute this device refers to, add this
* device to its reference list. This makes, e.g., finding all
* "scsi"s easier.
*/
for (nv = attrs; nv != NULL; nv = nv->nv_next) {
a = nv->nv_ptr;
if (a->a_iattr)
a->a_refs = addtoattr(a->a_refs, dev);
}
return;
bad:
nvfreel(loclist);
nvfreel(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(char *name)
{
u_char *p;
struct devbase *dev;
p = (u_char *)name;
if (!isalpha(*p))
goto badname;
while (*++p) {
if (!isalnum(*p) && *p != '_')
goto badname;
}
if (isdigit(*--p)) {
badname:
error("bad device base name `%s'", name);
return (&errdev);
}
dev = ht_lookup(devbasetab, name);
if (dev == NULL) {
dev = emalloc(sizeof *dev);
dev->d_name = name;
dev->d_next = NULL;
dev->d_isdef = 0;
dev->d_major = NODEV;
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;
*nextbase = dev;
nextbase = &dev->d_next;
if (ht_insert(devbasetab, name, dev))
panic("getdevbase(%s)", 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 nvlist *attrs)
{
struct nvlist *nv;
struct attr *a;
struct deva *da;
if (dev == &errdev)
goto bad;
if (deva == NULL)
deva = getdevattach(dev->d_name);
if (deva == &errdeva)
goto bad;
if (!dev->d_isdef) {
error("attaching undefined device `%s'", dev->d_name);
goto bad;
}
if (deva->d_isdef) {
error("redefinition of `%s'", deva->d_name);
goto bad;
}
if (dev->d_ispseudo) {
error("pseudo-devices can't attach");
goto bad;
}
deva->d_isdef = 1;
if (has_errobj(attrs, &errattr))
goto bad;
for (nv = attrs; nv != NULL; nv = nv->nv_next) {
a = nv->nv_ptr;
if (a == &errattr)
continue; /* already complained */
if (a->a_iattr)
error("`%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;
/*
* 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 */
/*
* Make sure that an attachment spec doesn't
* already say how to attach to this attribute.
*/
for (da = dev->d_ahead; da != NULL; da = da->d_bsame)
if (onlist(da->d_atlist, a))
error("attach at `%s' already done by `%s'",
a ? a->a_name : "root", da->d_name);
if (a == NULL)
continue; /* at root; don't add */
if (!a->a_iattr)
error("%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);
nvfreel(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)
{
u_char *p;
struct deva *deva;
p = (u_char *)name;
if (!isalpha(*p))
goto badname;
while (*++p) {
if (!isalnum(*p) && *p != '_')
goto badname;
}
if (isdigit(*--p)) {
badname:
error("bad device attachment name `%s'", name);
return (&errdeva);
}
deva = ht_lookup(devatab, name);
if (deva == NULL) {
deva = emalloc(sizeof *deva);
deva->d_name = name;
deva->d_next = NULL;
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;
*nextdeva = deva;
nextdeva = &deva->d_next;
if (ht_insert(devatab, name, deva))
panic("getdeva(%s)", name);
}
return (deva);
}
/*
* Look up an attribute.
*/
struct attr *
getattr(const char *name)
{
struct attr *a;
if ((a = ht_lookup(attrtab, name)) == NULL) {
error("undefined attribute `%s'", name);
a = &errattr;
}
return (a);
}
/*
* Set the major device number for a device, so that it can be used
* as a root/swap/dumps "on" device in a configuration.
*/
void
setmajor(struct devbase *d, int n)
{
if (d != &errdev && d->d_major != NODEV)
error("device `%s' is already major %d",
d->d_name, d->d_major);
else
d->d_major = n;
}
#define ABS(x) ((x) < 0 ? -(x) : (x))
static int
exclude(struct nvlist *nv, const char *name, const char *what)
{
if (nv != NULL) {
error("%s: swap generic must not specify %s", name, what);
return (1);
}
return (0);
}
/*
* 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;
int maj, min, l;
int unit;
char buf[NAMESIZE];
part -= 'a';
if ((part >= maxpartitions) || (part < 0))
panic("resolve");
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 (dflt->nv_int != NODEV) {
maj = major(dflt->nv_int);
min = (minor(dflt->nv_int) / maxpartitions) + part;
d = makedev(maj, min);
}
*nvp = nv = newnv(NULL, NULL, NULL, d, NULL);
}
if (nv->nv_int != NODEV) {
/*
* By the numbers. Find the appropriate major number
* to make a name.
*/
maj = major(nv->nv_int);
min = minor(nv->nv_int);
for (dev = allbases; dev != NULL; dev = dev->d_next)
if (dev->d_major == maj)
break;
if (dev == NULL)
(void)snprintf(buf, sizeof buf, "<%d/%d>",
maj, min);
else
(void)snprintf(buf, sizeof buf, "%s%d%c",
dev->d_name, min / maxpartitions,
(min % maxpartitions) + 'a');
nv->nv_str = intern(buf);
return (0);
}
if (nv->nv_str == NULL || nv->nv_str == s_nfs)
/*
* NFS spec. Leave as NODEV.
*/
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(cp[-1])) {
l--;
part = *cp - 'a';
}
cp = nv->nv_str;
if (split(cp, l, buf, sizeof buf, &unit)) {
error("%s: invalid %s device name `%s'", name, what, cp);
return (1);
}
dev = ht_lookup(devbasetab, intern(buf));
if (dev == NULL || dev->d_major == NODEV) {
error("%s: can't make %s device from `%s'",
name, what, nv->nv_str);
return (1);
}
nv->nv_name = dev->d_name;
nv->nv_int = makedev(dev->d_major, unit * maxpartitions + part);
return (0);
}
static int
lresolve(struct nvlist **nvp, const char *name, const char *what,
struct nvlist *dflt, int part)
{
int err;
while ((err = resolve(nvp, name, what, dflt, part)) == 0 &&
(*nvp)->nv_next != NULL)
nvp = &(*nvp)->nv_next;
return (err);
}
/*
* Add a completed configuration to the list.
*/
void
addconf(struct config *cf0)
{
struct config *cf;
struct nvlist *nv;
const char *name;
name = cf0->cf_name;
cf = emalloc(sizeof *cf);
if (ht_insert(cfhashtab, name, cf)) {
error("configuration `%s' already defined", name);
free(cf);
goto bad;
}
*cf = *cf0;
/*
* Look for "swap generic".
*/
for (nv = cf->cf_swap; nv != NULL; nv = nv->nv_next)
if (nv->nv_str == s_generic)
break;
if (nv != NULL) {
/*
* Make sure no root or dump device specified, and no
* other swap devices. Note single | here (check all).
*/
nv = cf->cf_swap;
if (exclude(cf->cf_root, name, "root device") |
exclude(nv->nv_next, name, "additional swap devices") |
exclude(cf->cf_dump, name, "dump device"))
goto bad;
} else {
nv = cf->cf_root;
if (nv == NULL) {
error("%s: no root device specified", name);
goto bad;
}
if (resolve(&cf->cf_root, name, "root", nv, 'a') |
lresolve(&cf->cf_swap, name, "swap", nv, 'b') |
resolve(&cf->cf_dump, name, "dumps", nv, 'b'))
goto bad;
}
*nextcf = cf;
nextcf = &cf->cf_next;
return;
bad:
nvfreel(cf0->cf_root);
nvfreel(cf0->cf_swap);
nvfreel(cf0->cf_dump);
}
void
setconf(struct nvlist **npp, const char *what, struct nvlist *v)
{
if (*npp != NULL) {
error("duplicate %s specification", what);
nvfreel(v);
} else
*npp = v;
}
static struct devi *
newdevi(const char *name, int unit, struct devbase *d)
{
struct devi *i;
i = emalloc(sizeof *i);
i->i_name = name;
i->i_unit = unit;
i->i_base = d;
i->i_next = NULL;
i->i_bsame = NULL;
i->i_asame = NULL;
i->i_alias = NULL;
i->i_at = NULL;
i->i_atattr = NULL;
i->i_atdev = NULL;
i->i_atdeva = NULL;
i->i_locs = NULL;
i->i_cfflags = 0;
i->i_cfindex = -1;
i->i_lineno = currentline();
if (unit >= d->d_umax)
d->d_umax = unit + 1;
return (i);
}
/*
* Enable an already declared but disabled device.
*/
void
enabledev(const char *name, const char *at)
{
struct devbase *ib, *ab;
char atbuf[NAMESIZE];
struct attr *attr;
struct nvlist *nv;
struct devi *i;
const char *cp;
int atunit;
i = ht_lookup(devitab, name);
if (i == NULL) {
error("invalid device `%s'", name);
return;
}
ib = i->i_base;
if (split(at, strlen(at), atbuf, sizeof atbuf, &atunit)) {
error("invalid attachment name `%s'", at);
return;
}
cp = intern(atbuf);
ab = ht_lookup(devbasetab, cp);
if (ab == NULL) {
error("invalid attachment device `%s'", cp);
return;
}
for (nv = ab->d_attrs; nv != NULL; nv = nv->nv_next) {
attr = nv->nv_ptr;
if (onlist(attr->a_devs, ib))
goto foundattachment;
}
error("%s's cannot attach to %s's", ib->d_name, atbuf);
return;
foundattachment:
while (i && i->i_atdev != ab)
i = i->i_alias;
if (i == NULL) {
error("%s at %s not found", name, at);
return;
} else
i->i_disable = 0; /* Enable */
}
/*
* 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 nvlist *loclist, int flags,
int disable)
{
struct devi *i; /* the new instance */
struct attr *attr; /* attribute that allows attach */
struct devbase *ib; /* i->i_base */
struct devbase *ab; /* not NULL => at another dev */
struct nvlist *nv;
struct deva *iba; /* devbase attachment used */
const char *cp;
int atunit;
char atbuf[NAMESIZE];
int hit;
ab = NULL;
iba = NULL;
if (at == NULL) {
/* "at root" */
if ((i = getdevi(name)) == NULL)
goto bad;
/*
* Must warn about i_unit > 0 later, after taking care of
* the STAR cases (we could do non-star's here but why
* bother?). Make sure this device can be at root.
*/
ib = i->i_base;
hit = 0;
for (iba = ib->d_ahead; iba != NULL; iba = iba->d_bsame)
if (onlist(iba->d_atlist, NULL)) {
hit = 1;
break;
}
if (!hit) {
error("%s's cannot attach to the root", ib->d_name);
goto bad;
}
attr = &errattr; /* a convenient "empty" attr */
} else {
if (split(at, strlen(at), atbuf, sizeof atbuf, &atunit)) {
error("invalid attachment name `%s'", at);
/* (void)getdevi(name); -- ??? */
goto bad;
}
if ((i = getdevi(name)) == NULL)
goto bad;
ib = i->i_base;
cp = intern(atbuf);
/*
* 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.
*/
/* 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))
goto findattachment;
/*
* 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) {
error("%s at %s: `%s' unknown",
name, at, atbuf);
goto bad;
}
/*
* See if the named parent carries an attribute
* that allows it to supervise device ib.
*/
for (nv = ab->d_attrs; nv != NULL; nv = nv->nv_next) {
attr = nv->nv_ptr;
if (onlist(attr->a_devs, ib))
goto findattachment;
}
error("%s's cannot attach to %s's", ib->d_name, atbuf);
goto bad;
findattachment:
/* find out which attachment it uses */
hit = 0;
for (iba = ib->d_ahead; iba != NULL; iba = iba->d_bsame)
if (onlist(iba->d_atlist, attr)) {
hit = 1;
break;
}
if (!hit)
panic("adddev: can't figure out attachment");
}
if ((i->i_locs = fixloc(name, attr, loclist)) == NULL)
goto bad;
i->i_at = at;
i->i_atattr = attr;
i->i_atdev = ab;
i->i_atdeva = iba;
i->i_atunit = atunit;
i->i_cfflags = flags;
i->i_disable = disable;
*iba->d_ipp = i;
iba->d_ipp = &i->i_asame;
selectbase(ib, iba);
/* all done, fall into ... */
bad:
nvfreel(loclist);
return;
}
void
addpseudo(const char *name, int number, int disable)
{
struct devbase *d;
struct devi *i;
d = ht_lookup(devbasetab, name);
if (d == NULL) {
error("undefined pseudo-device %s", name);
return;
}
if (!d->d_ispseudo) {
error("%s is a real device, not a pseudo-device", name);
return;
}
if (ht_lookup(devitab, name) != NULL) {
warnx("warning: duplicate definition of `%s', will use latest definition", name);
d->d_umax = number;
return;
}
i = newdevi(name, number - 1, d); /* foo 16 => "foo0..foo15" */
if (ht_insert(devitab, name, i))
panic("addpseudo(%s)", name);
i->i_disable = disable;
selectbase(d, NULL);
*nextpseudo = i;
nextpseudo = &i->i_next;
npseudo++;
}
/*
* 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)) {
error("invalid device name `%s'", name);
return (NULL);
}
d = ht_lookup(devbasetab, intern(base));
if (d == NULL) {
error("%s: unknown device `%s'", name, base);
return (NULL);
}
if (d->d_ispseudo) {
error("%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("getdevi(%s)", name);
*d->d_ipp = i;
d->d_ipp = &i->i_bsame;
} else {
while (firsti->i_alias)
firsti = firsti->i_alias;
firsti->i_alias = i;
}
*nextdevi = i;
nextdevi = &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)) {
error("device name `%s%c' too long", name, c);
len = sizeof(buf) - 2;
}
bcopy(name, buf, len);
buf[len] = 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(*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(cp[-1]))
l--, cp--;
*aunit = atoi(cp);
}
bcopy(name, base, l);
base[l] = 0;
return (0);
}
/*
* 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 nvlist *nv;
(void)ht_insert(selecttab, d->d_name, (char *)d->d_name);
for (nv = d->d_attrs; nv != NULL; nv = nv->nv_next) {
a = nv->nv_ptr;
(void)ht_insert(selecttab, a->a_name, (char *)a->a_name);
}
if (da != NULL) {
(void)ht_insert(selecttab, da->d_name, (char *)da->d_name);
for (nv = da->d_attrs; nv != NULL; nv = nv->nv_next) {
a = nv->nv_ptr;
(void)ht_insert(selecttab, a->a_name,
(char *)a->a_name);
}
}
}
/*
* Is the given pointer on the given list of pointers?
*/
static 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)
{
int l;
l = strlen(name);
bcopy(name, p, 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 nvlist *got)
{
struct nvlist *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((attr->a_loclen + 1) * sizeof(const char *));
for (n = got; n != NULL; n = n->nv_next)
n->nv_int = -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->nv_next, ord++) {
for (n = got; n != NULL; n = n->nv_next) {
if (n->nv_name == m->nv_name) {
n->nv_int = ord;
break;
}
}
if (n == NULL && m->nv_int == 0) {
nmissing++;
mp = extend(mp, m->nv_name);
}
lp[ord] = m->nv_str;
}
if (ord != attr->a_loclen)
panic("fixloc");
lp[ord] = NULL;
nextra = 0;
ep = extra;
nnodefault = 0;
ndp = nodefault;
for (n = got; n != NULL; n = n->nv_next) {
if (n->nv_int >= 0) {
if (n->nv_str != NULL)
lp[n->nv_int] = n->nv_str;
else if (lp[n->nv_int] == NULL) {
nnodefault++;
ndp = extend(ndp, n->nv_name);
}
} else {
nextra++;
ep = extend(ep, n->nv_name);
}
}
if (nextra) {
ep[-2] = 0; /* kill ", " */
error("%s: extraneous locator%s: %s",
name, nextra > 1 ? "s" : "", extra);
}
if (nmissing) {
mp[-2] = 0;
error("%s: must specify %s", name, missing);
}
if (nnodefault) {
ndp[-2] = 0;
error("%s: cannot wildcard %s", name, nodefault);
}
if (nmissing || nnodefault) {
free(lp);
lp = NULL;
}
return (lp);
}