shithub: riscv

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rio: implement writable and truncatable /dev/text

--- a/sys/src/cmd/rio/dat.h

+++ b/sys/src/cmd/rio/dat.h

@@ -68,6 +68,7 @@

 	Rawoff,

 	Holdon,

 	Holdoff,

+	Truncate,

 	Deleted,

 	Exited,

 };

--- a/sys/src/cmd/rio/fsys.c

+++ b/sys/src/cmd/rio/fsys.c

@@ -32,7 +32,7 @@

 	{ "mouse",	QTFILE,	Qmouse,		0600 },

 	{ "screen",		QTFILE,	Qscreen,		0400 },

 	{ "snarf",		QTFILE,	Qsnarf,		0600 },

-	{ "text",		QTFILE,	Qtext,		0400 },

+	{ "text",		QTFILE,	Qtext,		0600 },

 	{ "wdir",		QTFILE,	Qwdir,		0600 },

 	{ "wctl",		QTFILE,	Qwctl,		0600 },

 	{ "window",	QTFILE,	Qwindow,		0400 },

@@ -494,12 +494,14 @@

 	Fcall t;

 	int m;

-	/* can't truncate anything, so just disregard */

-	x->mode &= ~(OTRUNC|OCEXEC);

+	/* can't truncate anything but Qtext, so just disregard */

+	if(FILE(f->qid) != Qtext)

+		x->mode &= ~OTRUNC;

+	x->mode &= ~OCEXEC;

 	/* can't execute or remove anything */

 	if(x->mode==OEXEC || (x->mode&ORCLOSE))

 		goto Deny;

-	switch(x->mode){

+	switch(x->mode & ~OTRUNC){

 	default:

 		goto Deny;

 	case OREAD:

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -1198,6 +1198,9 @@

 		wrepaint(w);

 		flushimage(display, 1);

 		break;

+	case Truncate:

+		wdelete(w, 0, w->nr);

+		break;

 	case Deleted:

 		wclunk(w);

 		if(w->notefd >= 0)

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -250,6 +250,10 @@

 		return;

 	}

 	switch(FILE(x->f->qid)){

+	case Qtext:

+		if(x->mode&OTRUNC)

+			wsendctlmesg(w, Truncate, ZR, nil);

+		break;

 	case Qconsctl:

 		if(w->ctlopen){

 			filsysrespond(x->fs, x, &t, Einuse);

@@ -386,6 +390,7 @@

 	x->data[cnt] = 0;

 	switch(qid){

 	case Qcons:

+	case Qtext:

 		alts[CWdata].c = w->conswrite;

 		alts[CWdata].v = &cwm;

 		alts[CWdata].op = CHANRCV;