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wmii/fs.c

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/* (C)opyright MMVI Kris Maglione <fbsdaemon at gmail dot com>
* See LICENSE file for license details.
*/
#include "wmii.h"
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/* Datatypes: */
/**************/
typedef struct Dirtab Dirtab;
struct Dirtab {
char *name;
uchar qtype;
uint type;
uint perm;
};
typedef struct FidLink FidLink;
struct FidLink {
FidLink *next;
Fid *fid;
};
typedef struct FileId FileId;
struct FileId {
FileId *next;
union {
void *ref;
char *buf;
Bar *bar;
Bar **bar_p;
View *view;
Client *client;
Ruleset *rule;
BlitzColor *col;
} content;
uint id;
uint index;
Dirtab tab;
ushort nref;
};
/* Constants */
/*************/
enum { /* Dirs */
FsRoot, FsDClient, FsDClients, FsDBars,
FsDTag, FsDTags,
/* Files */
FsFBar, FsFCctl, FsFColRules,
FsFCtags, FsFEvent, FsFKeys, FsFRctl,
FsFTagRules, FsFTctl, FsFTindex,
FsFprops
};
/* Error messages */
static char
Enoperm[] = "permission denied",
Enofile[] = "file not found",
Ebadvalue[] = "bad value",
Einterrupted[] = "interrupted",
Ebadcmd[] = "bad command";
/* Macros */
#define QID(t, i) (((vlong)((t)&0xFF)<<32)|((i)&0xFFFFFFFF))
/* Global Vars */
/***************/
FileId *free_fileid = nil;
P9Req *pending_event_reads = nil;
FidLink *pending_event_fids;
P9Srv p9srv = {
.open= fs_open,
.walk= fs_walk,
.read= fs_read,
.stat= fs_stat,
.write= fs_write,
.clunk= fs_clunk,
.flush= fs_flush,
.attach=fs_attach,
.create=fs_create,
.remove=fs_remove,
.freefid=fs_freefid
};
/* ad-hoc file tree. Empty names ("") indicate dynamic entries to be filled
* in by lookup_file */
static Dirtab
dirtab_root[]= {{".", P9QTDIR, FsRoot, 0500|P9DMDIR },
{"rbar", P9QTDIR, FsDBars, 0700|P9DMDIR },
{"lbar", P9QTDIR, FsDBars, 0700|P9DMDIR },
{"client", P9QTDIR, FsDClients, 0500|P9DMDIR },
{"tag", P9QTDIR, FsDTags, 0500|P9DMDIR },
{"ctl", P9QTAPPEND, FsFRctl, 0600|P9DMAPPEND },
{"colrules", P9QTFILE, FsFColRules, 0600 },
{"event", P9QTFILE, FsFEvent, 0600 },
{"keys", P9QTFILE, FsFKeys, 0600 },
{"tagrules", P9QTFILE, FsFTagRules, 0600 },
{nil}},
dirtab_clients[]={{".", P9QTDIR, FsDClients, 0500|P9DMDIR },
{"", P9QTDIR, FsDClient, 0500|P9DMDIR },
{nil}},
dirtab_client[]= {{".", P9QTDIR, FsDClient, 0500|P9DMDIR },
{"ctl", P9QTAPPEND, FsFCctl, 0600|P9DMAPPEND },
{"tags", P9QTFILE, FsFCtags, 0600 },
{"props", P9QTFILE, FsFprops, 0400 },
{nil}},
dirtab_bars[]= {{".", P9QTDIR, FsDBars, 0700|P9DMDIR },
{"", P9QTFILE, FsFBar, 0600 },
{nil}},
dirtab_tags[]= {{".", P9QTDIR, FsDTags, 0500|P9DMDIR },
{"", P9QTDIR, FsDTag, 0500|P9DMDIR },
{nil}},
dirtab_tag[]= {{".", P9QTDIR, FsDTag, 0500|P9DMDIR },
{"ctl", P9QTAPPEND, FsFTctl, 0600|P9DMAPPEND },
{"index", P9QTFILE, FsFTindex, 0400 },
{nil}};
/* Writing the lists separately and using an array of their references
* removes the need for casting and allows for C90 conformance,
* since otherwise we would need to use compound literals */
static Dirtab *dirtab[] = {
[FsRoot] = dirtab_root,
[FsDBars] = dirtab_bars,
[FsDClients] = dirtab_clients,
[FsDClient] = dirtab_client,
[FsDTags] = dirtab_tags,
[FsDTag] = dirtab_tag,
};
/* Utility Functions */
/*********************/
/* get_file/free_file save and reuse old FileId structs
* since so many of them are needed for so many
* purposes */
static FileId *
get_file() {
FileId *temp;
if(!free_fileid) {
uint i = 15;
temp = ixp_emallocz(sizeof(FileId) * i);
for(; i; i--) {
temp->next = free_fileid;
free_fileid = temp++;
}
}
temp = free_fileid;
free_fileid = temp->next;
temp->nref = 1;
temp->next = nil;
return temp;
}
static void
free_file(FileId *f) {
if(--f->nref)
return;
free(f->tab.name);
f->next = free_fileid;
free_fileid = f;
}
/* This function's name belies it's true purpose. It increases
* the reference counts of the FileId list */
static void
clone_files(FileId *f) {
for(; f; f=f->next)
assert(f->nref++);
}
/* This should be moved to libixp */
static void
write_buf(P9Req *r, void *buf, uint len) {
if(r->ifcall.offset >= len)
return;
len -= r->ifcall.offset;
if(len > r->ifcall.count)
len = r->ifcall.count;
r->ofcall.data = ixp_emalloc(len);
memcpy(r->ofcall.data, buf + r->ifcall.offset, len);
r->ofcall.count = len;
}
/* This should be moved to libixp */
void
write_to_buf(P9Req *r, void *buf, uint *len, uint max) {
uint offset, count;
offset = (r->fid->omode&P9OAPPEND) ? *len : r->ifcall.offset;
if(offset > *len || r->ifcall.count == 0) {
r->ofcall.count = 0;
return;
}
count = r->ifcall.count;
if(max && (count > max - offset))
count = max - offset;
*len = offset + count;
if(max == 0) {
*(void **)buf = ixp_erealloc(*(void **)buf, *len + 1);
buf = *(void **)buf;
}
memcpy(buf + offset, r->ifcall.data, count);
r->ofcall.count = count;
((char *)buf)[offset+count] = '\0';
}
/* This should be moved to libixp */
void
data_to_cstring(P9Req *r) {
uint i;
i = r->ifcall.count;
if(!i || r->ifcall.data[i - 1] != '\n')
r->ifcall.data = ixp_erealloc(r->ifcall.data, ++i);
assert(r->ifcall.data);
r->ifcall.data[i - 1] = '\0';
}
char *
message_root(char *message)
{
uint n;
if(!strchr(message, ' ')) {
snprintf(buffer, BUFFER_SIZE, "%s ", message);
message = buffer;
}
if(!strncmp(message, "quit ", 5))
srv.running = 0;
else if(!strncmp(message, "view ", 5))
select_view(&message[5]);
else if(!strncmp(message, "focuscolors ", 12)) {
message += 12;
n = strlen(message);
return parse_colors(&message, (int *)&n, &def.focuscolor);
}
else if(!strncmp(message, "selcolors ", 10)) {
message += 10;
n = strlen(message);
return parse_colors(&message, (int *)&n, &def.selcolor);
}
else if(!strncmp(message, "normcolors ", 11)) {
message += 11;
n = strlen(message);
return parse_colors(&message, (int *)&n, &def.normcolor);
}
else if(!strncmp(message, "font ", 5)) {
message += 5;
free(def.font.fontstr);
def.font.fontstr = ixp_estrdup(message);
loadfont(&blz, &def.font);
resize_bar(screen);
}
else if(!strncmp(message, "border ", 7)) {
message += 7;
n = (uint)strtol(message, &message, 10);
if(*message)
return Ebadvalue;
def.border = n;
}
else if(!strncmp(message, "grabmod ", 8)) {
message += 8;
ulong mod;
mod = mod_key_of_str(message);
if(!(mod & (Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask)))
return Ebadvalue;
strncpy(def.grabmod, message, sizeof(def.grabmod));
def.mod = mod;
if(view)
restack_view(screen->sel);
}
else
return Ebadcmd;
return nil;
}
char *
read_root_ctl() {
uint i = 0;
if(screen->sel)
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "view %s\n", screen->sel->name);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "focuscolors %s\n", def.focuscolor.colstr);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "selcolors %s\n", def.selcolor.colstr);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "normcolors %s\n", def.normcolor.colstr);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "font %s\n", def.font.fontstr);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "grabmod %s\n", def.grabmod);
i += snprintf(&buffer[i], (BUFFER_SIZE - i), "border %d\n", def.border);
return buffer;
}
void
respond_event(P9Req *r) {
FileId *f = r->fid->aux;
if(f->content.buf) {
r->ofcall.data = (void *)f->content.buf;
r->ofcall.count = strlen(f->content.buf);
respond(r, nil);
f->content.buf = nil;
}else{
r->aux = pending_event_reads;
pending_event_reads = r;
}
}
void
write_event(char *format, ...) {
uint len, slen;
va_list ap;
FidLink *f;
FileId *fi;
P9Req *aux;
va_start(ap, format);
vsnprintf(buffer, BUFFER_SIZE, format, ap);
va_end(ap);
if(!(len = strlen(buffer)))
return;
for(f=pending_event_fids; f; f=f->next) {
fi = f->fid->aux;
slen = fi->content.buf ? strlen(fi->content.buf) : 0;
fi->content.buf = (char *) ixp_erealloc(fi->content.buf, slen + len + 1);
(fi->content.buf)[slen] = '\0';
strcat(fi->content.buf, buffer);
}
while((aux = pending_event_reads)) {
pending_event_reads = pending_event_reads->aux;
respond_event(aux);
}
}
static void
dostat(Stat *s, uint len, FileId *f) {
s->type = 0;
s->dev = 0;
s->qid.path = QID(f->tab.type, f->id);
s->qid.version = 0;
s->qid.type = f->tab.qtype;
s->mode = f->tab.perm;
s->atime = time(nil);
s->mtime = time(nil);
s->length = len;
s->name = f->tab.name;
s->uid = user;
s->gid = user;
s->muid = user;
}
/* lookup_file */
/***************/
/* All lookups and directory organization should be performed through
* lookup_file, mostly through the dirtabs[] tree. */
static FileId *
lookup_file(FileId *parent, char *name)
{
FileId *ret, *file, **last;
Dirtab *dir;
Client *c;
View *v;
Bar *b;
uint id;
if(!(parent->tab.perm & P9DMDIR))
return nil;
dir = dirtab[parent->tab.type];
last = &ret;
ret = nil;
for(; dir->name; dir++) {
/* Dynamic dirs */
if(!*dir->name) { /* strlen(dir->name) == 0 */
switch(parent->tab.type) {
case FsDClients:
if(!name || !strncmp(name, "sel", 4)) {
if((c = sel_client())) {
file = get_file();
*last = file;
last = &file->next;
file->content.client = c;
file->id = c->win;
file->index = c->win;
file->tab = *dir;
file->tab.name = ixp_estrdup("sel");
}if(name) goto LastItem;
}
if(name) {
id = (uint)strtol(name, &name, 16);
if(*name) goto NextItem;
}
for(c=client; c; c=c->next) {
if(!name || c->win == id) {
file = get_file();
*last = file;
last = &file->next;
file->content.client = c;
file->id = c->win;
file->tab = *dir;
file->tab.name = ixp_emallocz(16);
snprintf(file->tab.name, 16, "0x%x", (uint)c->win);
if(name) goto LastItem;
}
}
break;
case FsDTags:
if(!name || !strncmp(name, "sel", 4)) {
if(screen->sel) {
file = get_file();
*last = file;
last = &file->next;
file->content.view = screen->sel;
file->id = screen->sel->id;
file->tab = *dir;
file->tab.name = ixp_estrdup("sel");
}if(name) goto LastItem;
}
for(v=view; v; v=v->next) {
if(!name || !strcmp(name, v->name)) {
file = get_file();
*last = file;
last = &file->next;
file->content.view = v;
file->id = v->id;
file->tab = *dir;
file->tab.name = ixp_estrdup(v->name);
if(name) goto LastItem;
}
}
break;
case FsDBars:
for(b=*parent->content.bar_p; b; b=b->next) {
if(!name || !strcmp(name, b->name)) {
file = get_file();
*last = file;
last = &file->next;
file->content.bar = b;
file->id = b->id;
file->tab = *dir;
file->tab.name = ixp_estrdup(b->name);
if(name) goto LastItem;
}
}
break;
}
}else /* Static dirs */
if(!name || !strcmp(name, dir->name)) {
file = get_file();
*last = file;
last = &file->next;
file->id = 0;
file->content.ref = parent->content.ref;
file->index = parent->index;
file->tab = *dir;
file->tab.name = ixp_estrdup(file->tab.name);
/* Special considerations: */
switch(file->tab.type) {
case FsDBars:
if(!strncmp(file->tab.name, "lbar", 5))
file->content.bar_p = &screen[0].lbar;
else
file->content.bar_p = &screen[0].rbar;
break;
case FsFColRules:
file->content.rule = &def.colrules;
break;
case FsFTagRules:
file->content.rule = &def.tagrules;
break;
}
if(name) goto LastItem;
}
NextItem:
continue;
}
LastItem:
*last = nil;
return ret;
}
/* Service Functions */
/*********************/
void
fs_attach(P9Req *r) {
FileId *f = get_file();
f->tab = dirtab[FsRoot][0];
f->tab.name = ixp_estrdup("/");
f->content.ref = nil; /* shut up valgrind */
r->fid->aux = f;
r->fid->qid.type = f->tab.qtype;
r->fid->qid.path = QID(f->tab.type, 0);
r->ofcall.qid = r->fid->qid;
respond(r, nil);
}
void
fs_walk(P9Req *r) {
FileId *f, *nf;
int i;
f = r->fid->aux;
clone_files(f);
for(i=0; i < r->ifcall.nwname; i++) {
if(!strncmp(r->ifcall.wname[i], "..", 3)) {
if(f->next) {
nf=f;
f=f->next;
free_file(nf);
}
}else{
nf = lookup_file(f, r->ifcall.wname[i]);
if(!nf)
break;
assert(!nf->next);
if(strncmp(r->ifcall.wname[i], ".", 2)) {
nf->next = f;
f = nf;
}
}
r->ofcall.wqid[i].type = f->tab.qtype;
r->ofcall.wqid[i].path = QID(f->tab.type, f->id);
}
/* There should be a way to do this on freefid() */
if(i < r->ifcall.nwname) {
while((nf = f)) {
f=f->next;
free_file(nf);
}
respond(r, Enofile);
return;
}
/* Remove refs for r->fid if no new fid */
/* If Fids were ref counted, this could be
* done in their decref function */
if(r->ifcall.fid == r->ifcall.newfid) {
nf=r->fid->aux;
r->fid->aux = f;
while((nf = f)) {
f=f->next;
free_file(nf);
}
}
r->newfid->aux = f;
r->ofcall.nwqid = i;
respond(r, nil);
}
uint
fs_size(FileId *f) {
switch(f->tab.type) {
default:
return 0;
case FsFColRules:
case FsFTagRules:
return f->content.rule->size;
case FsFKeys:
return def.keyssz;
case FsFCtags:
return strlen(f->content.client->tags);
case FsFprops:
return strlen(f->content.client->props);
}
}
void
fs_stat(P9Req *r) {
Stat s;
int size;
uchar *buf;
dostat(&s, fs_size(r->fid->aux), r->fid->aux);
r->ofcall.nstat = size = ixp_sizeof_stat(&s);
buf = ixp_emallocz(size);
r->ofcall.stat = buf;
ixp_pack_stat(&buf, &size, &s);
respond(r, nil);
}
void
fs_read(P9Req *r) {
char *buf;
FileId *f, *tf;
int n, offset;
int size;
offset = 0;
f = r->fid->aux;
if(f->tab.perm & P9DMDIR && f->tab.perm & 0400) {
Stat s;
offset = 0;
size = r->ifcall.count;
buf = ixp_emallocz(size);
r->ofcall.data = buf;
tf = f = lookup_file(f, nil);
/* Note: f->tab.name == "." so we skip it */
for(f=f->next; f; f=f->next) {
dostat(&s, fs_size(f), f);
n = ixp_sizeof_stat(&s);
if(offset >= r->ifcall.offset) {
if(size < n)
break;
ixp_pack_stat((uchar **)&buf, &size, &s);
}
offset += n;
}
while((f = tf)) {
tf=tf->next;
free_file(f);
}
r->ofcall.count = r->ifcall.count - size;
respond(r, nil);
return;
}
else{
switch(f->tab.type) {
case FsFprops:
write_buf(r, (void *)f->content.client->props, strlen(f->content.client->props));
respond(r, nil);
return;
case FsFColRules:
case FsFTagRules:
write_buf(r, (void *)f->content.rule->string, f->content.rule->size);
respond(r, nil);
return;
case FsFKeys:
write_buf(r, (void *)def.keys, def.keyssz);
respond(r, nil);
return;
case FsFCtags:
write_buf(r, (void *)f->content.client->tags, strlen(f->content.client->tags));
respond(r, nil);
return;
case FsFTctl:
write_buf(r, (void *)f->content.view->name, strlen(f->content.view->name));
respond(r, nil);
return;
case FsFBar:
write_buf(r, (void *)f->content.bar->buf, strlen(f->content.bar->buf));
respond(r, nil);
return;
case FsFRctl:
buf = read_root_ctl();
write_buf(r, buf, strlen(buf));
respond(r, nil);
return;
case FsFCctl:
if(r->ifcall.offset) {
respond(r, nil);
return;
}
r->ofcall.data = ixp_emallocz(16);
n = snprintf(r->ofcall.data, 16, "0x%x", (uint)f->index);
assert(n >= 0);
r->ofcall.count = n;
respond(r, nil);
return;
case FsFTindex:
buf = (char *)view_index(f->content.view);
n = strlen(buf);
write_buf(r, (void *)buf, n);
respond(r, nil);
return;
case FsFEvent:
respond_event(r);
return;
}
}
/* This is an assert because it should this should not be called if
* the file is not open for reading. */
assert(!"Read called on an unreadable file");
}
/* This function needs to be seriously cleaned up */
void
fs_write(P9Req *r) {
FileId *f;
char *errstr = nil;
uint i;
if(r->ifcall.count == 0) {
respond(r, nil);
return;
}
f = r->fid->aux;
switch(f->tab.type) {
case FsFColRules:
case FsFTagRules:
write_to_buf(r, &f->content.rule->string, &f->content.rule->size, 0);
respond(r, nil);
return;
case FsFKeys:
write_to_buf(r, &def.keys, &def.keyssz, 0);
respond(r, nil);
return;
case FsFCtags:
data_to_cstring(r);
apply_tags(f->content.client, r->ifcall.data);
r->ofcall.count = r->ifcall.count;
respond(r, nil);
return;
case FsFBar:
/* XXX: This should validate after each write */
i = strlen(f->content.bar->buf);
write_to_buf(r, &f->content.bar->buf, &i, 279);
r->ofcall.count = i - r->ifcall.offset;
respond(r, nil);
return;
case FsFCctl:
data_to_cstring(r);
if((errstr = message_client(f->content.client, r->ifcall.data))) {
respond(r, errstr);
return;
}
r->ofcall.count = r->ifcall.count;
respond(r, nil);
return;
case FsFTctl:
data_to_cstring(r);
if((errstr = message_view(f->content.view, r->ifcall.data))) {
respond(r, errstr);
return;
}
r->ofcall.count = r->ifcall.count;
respond(r, nil);
return;
case FsFRctl:
data_to_cstring(r);
{ uint n;
char *toks[32];
n = ixp_tokenize(toks, 32, r->ifcall.data, '\n');
for(i = 0; i < n; i++) {
if(errstr)
message_root(toks[i]);
else
errstr = message_root(toks[i]);
}
}
if(errstr) {
respond(r, errstr);
return;
}
r->ofcall.count = r->ifcall.count;
respond(r, nil);
return;
case FsFEvent:
if(r->ifcall.data[r->ifcall.count-1] == '\n')
write_event("%.*s", r->ifcall.count, r->ifcall.data);
else
write_event("%.*s\n", r->ifcall.count, r->ifcall.data);
r->ofcall.count = r->ifcall.count;
respond(r, nil);
return;
}
/* This is an assert because it should this should not be called if
* the file is not open for writing. */
assert(!"Write called on an unwritable file");
}
void
fs_open(P9Req *r) {
FidLink *fl;
FileId *f = r->fid->aux;
switch(f->tab.type) {
case FsFEvent:
fl = ixp_emallocz(sizeof(FidLink));
fl->fid = r->fid;
fl->next = pending_event_fids;
pending_event_fids = fl;
break;
}
if((r->ifcall.mode&3) == P9OEXEC) {
respond(r, Enoperm);
return;
}
if((r->ifcall.mode&3) != P9OREAD && !(f->tab.perm & 0200)) {
respond(r, Enoperm);
return;
}
if((r->ifcall.mode&3) != P9OWRITE && !(f->tab.perm & 0400)) {
respond(r, Enoperm);
return;
}
if((r->ifcall.mode&~(3|P9OAPPEND|P9OTRUNC))) {
respond(r, Enoperm);
return;
}
respond(r, nil);
}
void
fs_create(P9Req *r) {
FileId *f = r->fid->aux;
switch(f->tab.type) {
default:
/* XXX: This should be taken care of by the library */
respond(r, Enoperm);
return;
case FsDBars:
if(!strlen(r->ifcall.name)) {
respond(r, Ebadvalue);
return;
}
create_bar(f->content.bar_p, r->ifcall.name);
f = lookup_file(f, r->ifcall.name);
if(!f) {
respond(r, Enofile);
return;
}
r->ofcall.qid.type = f->tab.qtype;
r->ofcall.qid.path = QID(f->tab.type, f->id);
f->next = r->fid->aux;
r->fid->aux = f;
respond(r, nil);
break;
}
}
void
fs_remove(P9Req *r) {
FileId *f = r->fid->aux;
switch(f->tab.type) {
default:
/* XXX: This should be taken care of by the library */
respond(r, Enoperm);
return;
case FsFBar:
destroy_bar(f->next->content.bar_p, f->content.bar);
draw_bar(screen);
respond(r, nil);
break;
}
}
void
fs_clunk(P9Req *r) {
Client *c;
FidLink **fl, *ft;
char *buf;
int i;
FileId *f = r->fid->aux;
switch(f->tab.type) {
case FsFColRules:
update_rules(&f->content.rule->rule, f->content.rule->string);
break;
case FsFTagRules:
update_rules(&f->content.rule->rule, f->content.rule->string);
for(c=client; c; c=c->next)
apply_rules(c);
update_views();
break;
case FsFKeys:
update_keys();
break;
case FsFBar:
buf = f->content.bar->buf;
i = strlen(f->content.bar->buf);
parse_colors(&buf, &i, &f->content.bar->brush.color);
while(i > 0 && buf[i - 1] == '\n')
buf[--i] = '\0';
strncpy(f->content.bar->text, buf, sizeof(f->content.bar->text));
draw_bar(screen);
break;
case FsFEvent:
for(fl=&pending_event_fids; *fl; fl=&(*fl)->next)
if((*fl)->fid == r->fid) {
ft = *fl;
*fl = (*fl)->next;
f = ft->fid->aux;
free(f->content.buf);
free(ft);
break;
}
break;
}
respond(r, nil);
}
void
fs_flush(P9Req *r) {
P9Req **t;
for(t=&pending_event_reads; *t; t=(P9Req **)&(*t)->aux)
if(*t == r->oldreq) {
*t = (*t)->aux;
respond(r->oldreq, Einterrupted);
break;
}
respond(r, nil);
}
void
fs_freefid(Fid *f) {
FileId *id, *tid;
for(id=f->aux; id; id = tid) {
tid = id->next;
free_file(id);
}
}
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