From: qwx@sciops.net
To: 9front@9front.org
Subject: Re: [9front] delete in page(1)
Date: Fri, 31 Dec 2021 03:22:28 +0200 [thread overview]
Message-ID: <5628D0A34F0089B1D3753D6886A1ECFF@wopr.sciops.net> (raw)
In-Reply-To: <B898A3370CCC5475FB2E3F4057570468@prosimetrum.com>
diff 855cf4326f5a07d7142c2d8918f5fa856d912b85 uncommitted
--- a//sys/src/cmd/page.c
+++ b//sys/src/cmd/page.c
@@ -74,6 +74,7 @@
Czerox,
Cwrite,
Cext,
+ Cdel,
Cdummy2,
Cquit,
};
@@ -98,6 +99,7 @@
[Czerox] "zerox", 'z', 0, 0,
[Cwrite] "write", 'w', 0, 0,
[Cext] "ext", 'x', 0, 0,
+ [Cdel] "del", 'd', 0, 0,
[Cdummy2] "", 0, 0, 0,
[Cquit] "quit", 'q', Kdel, Keof,
};
@@ -134,6 +136,7 @@
void showpage(Page *);
void drawpage(Page *);
Point pagesize(Page *);
+void drawlock(int);
Page*
addpage(Page *up, char *name, int (*popen)(Page *), void *pdata, int fd)
@@ -986,6 +989,54 @@
}
}
+/* page entries are never freed, there's no point
+ * and would break everything */
+Page*
+delpage(Page *p)
+{
+ Page *t, *q;
+
+ if(p == nil)
+ return nil;
+ /* to remove(2) subpages in documents makes no sense, and just
+ * removing a subentry doesn't seem like a feature worth the bother */
+ if(p->up != root)
+ return p;
+ if(p->fd >= 0)
+ close(p->fd);
+ p->fd = -1;
+ if(remove(p->name) < 0){
+ fprint(2, "remove %s: %r", p->name);
+ return p;
+ }
+ qlock(&pagelock);
+ for(t = p->down; t != nil && t->up != root; t = q){
+ qlock(t);
+ drawlock(0);
+ unloadpage(t);
+ drawlock(1);
+ free(t->name);
+ free(t->data);
+ t->name = t->data = nil;
+ q = nextpage(t);
+ qunlock(t);
+ }
+ drawlock(0);
+ unloadpage(p);
+ drawlock(1);
+ free(p->name);
+ free(p->data);
+ p->name = p->data = nil;
+ if(root->down != p){
+ t = prevpage(p);
+ t->next = p->next;
+ }else
+ root->down = p->next;
+ qunlock(&pagelock);
+ qunlock(p);
+ return p->next != nil ? p->next : t;
+}
+
/*
* A draw operation that touches only the area contained in bot but not in top.
* mp and sp get aligned with bot.min.
@@ -1461,6 +1512,7 @@
char buf[NPATH], *s;
Point o;
int fd;
+ Page *p;
switch(i){
case Corigsize:
@@ -1545,6 +1597,19 @@
break;
case Csnarf:
writeaddr(current, "/dev/snarf");
+ break;
+ case Cdel:
+ if(current == nil || !canqlock(current))
+ break;
+ if((p = delpage(current)) == current){
+ qunlock(current);
+ break;
+ }
+ current = p;
+ if(current == nil)
+ break;
+ forward = 1;
+ showpage(current);
break;
case Cnext:
forward = 1;
next prev parent reply other threads:[~2021-12-31 1:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-30 23:15 qwx
2021-12-31 0:48 ` umbraticus
2021-12-31 1:09 ` qwx
2021-12-31 1:22 ` qwx [this message]
2021-12-31 2:05 ` umbraticus
2021-12-31 19:10 ` qwx
2022-01-01 10:42 ` umbraticus
2022-01-02 0:20 ` qwx
2022-01-02 1:19 ` umbraticus
[not found] <E7A7795549A08A34B4881C447544CF63@wopr.sciops.net>
2022-01-21 8:10 ` umbraticus
2022-01-23 1:06 ` qwx
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