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make = command's output plumbable

This patch makes sam's = cmd output what seems to me a more
useful (plumbable) format: /full/path/to/file:addr , where
addr is line(s) under = and rune(s) under =#.

--- a/sys/man/1/sam

+++ b/sys/man/1/sam

@@ -403,10 +403,10 @@

 Set dot.

 .TP

 .B =

-Print the line address and character address of the range.

+Print the file name and line address of the range.

 .TP

 .B =#

-Print just the character address of the range.

+Print the file name and character address of the range.

 .PD

 .SS File commands

 .PD 0

--- a/sys/src/cmd/sam/sam.c

+++ b/sys/src/cmd/sam/sam.c

@@ -688,11 +688,27 @@

 }

 void

-printposn(File *f, int charsonly)

+printposn(File *f, int chars)

 {

 	Posn l1, l2;

+	char *s;

-	if(!charsonly){

+	if(f->name.s[0]){

+		if(f->name.s[0]!='/'){

+			getcurwd();

+			s = Strtoc(&curwd);

+			dprint("%s", s);

+			free(s);

+		}

+		s = Strtoc(&f->name);

+		dprint("%s:", s);

+		free(s);

+	}

+	if(chars){

+		dprint("#%lud", addr.r.p1);

+		if(addr.r.p2 != addr.r.p1)

+			dprint(",#%lud", addr.r.p2);

+	}else{

 		l1 = 1+nlcount(f, (Posn)0, addr.r.p1);

 		l2 = l1+nlcount(f, addr.r.p1, addr.r.p2);

 		/* check if addr ends with '\n' */

@@ -701,11 +717,7 @@

 		dprint("%lud", l1);

 		if(l2 != l1)

 			dprint(",%lud", l2);

-		dprint("; ");

 	}

-	dprint("#%lud", addr.r.p1);

-	if(addr.r.p2 != addr.r.p1)

-		dprint(",#%lud", addr.r.p2);

 	dprint("\n");

 }