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samterm: support "showdata" plumb action

--- a/sys/src/cmd/samterm/plan9.c

+++ b/sys/src/cmd/samterm/plan9.c

@@ -184,8 +184,8 @@

 plumbformat(int i)

 {

 	Plumbmsg *m;

-	char *addr, *data, *act;

-	int n;

+	char *addr, *data, *act, *s;

+	int n, replaced;

 	data = (char*)plumbbuf[i].data;

 	m = plumbunpack(data, plumbbuf[i].n);

@@ -197,6 +197,37 @@

 		return 0;

 	}

 	act = plumblookup(m->attr, "action");

+

+	if(act != nil && strcmp(act, "showdata") == 0){

+		addr = plumblookup(m->attr, "filename");

+		n = sprint(data, "B \n");

+		if(addr != nil)

+			n += sprint(data+n, "f %s\n", addr);

+		n += sprint(data+n, "c\n");

+		s = memmove(data+n, m->data, m->ndata);

+		n += m->ndata;

+		if(data[n-1] != '\n')

+			data[n++] = '\n';

+		data[n] = 0;

+		replaced = 0;

+		for(;;){

+			s = strstr(s, ".\n");

+			if(s == nil)

+				break;

+			if(s[-1] != '\n')

+				continue;

+			s[0] = '';

+			s += 2;

+			replaced = 1;

+		}

+		n += sprint(data+n, ".\n");

+		if(replaced)

+			n += sprint(data+n, ",s/^$/./g\n");

+		plumbbuf[i].n = n;

+		plumbfree(m);

+		return 1;

+	}

+

 	if(act!=nil && strcmp(act, "showfile")!=0){

 		/* can't handle other cases yet */

 		plumbfree(m);