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sam: corner cases are hard

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

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

@@ -205,6 +205,7 @@

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

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

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

+		s--;

 		n += m->ndata;

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

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

@@ -211,13 +212,11 @@

 		data[n] = 0;

 		replaced = 0;

 		for(;;){

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

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

 			if(s == nil)

 				break;

+			s[1] = '';

 			s += 2;

-			if(s[-3] != '\n')

-				continue;

-			s[0] = '';

 			replaced = 1;

 		}

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