use %q to make debugging output easier to read.
also use %q when formatting arguments for rc.

Notes:
Tue Jul 13 16:47:33 EDT 2010 geoff
    I don't think that this solves a real problem.


Reference: /n/sources/patch/sorry/mkfmtq
Date: Wed Apr  7 21:13:03 CES 2010
Signed-off-by: quanstro@quanstro.net
Reviewed-by: geoff

--- /sys/src/cmd/mk/word.c	Wed Apr  7 21:09:16 2010
+++ /sys/src/cmd/mk/word.c	Wed Apr  7 21:09:10 2010
@@ -184,6 +184,6 @@
 {
 	Bprint(&bout, "%s", s);
 	for(; w; w = w->next)
-		Bprint(&bout, " '%s'", w->s);
+		Bprint(&bout, " %q", w->s);
 	Bputc(&bout, '\n');
 }
--- /sys/src/cmd/mk/var.c	Wed Apr  7 21:09:28 2010
+++ /sys/src/cmd/mk/var.c	Wed Apr  7 21:09:22 2010
@@ -14,7 +14,7 @@
 
 	Bprint(&bout, "\t%s=", s->name);
 	for (w = s->u.ptr; w; w = w->next)
-		Bprint(&bout, "'%s'", w->s);
+		Bprint(&bout, "%q ", w->s);
 	Bprint(&bout, "\n");
 }
 
--- /sys/src/cmd/mk/run.c	Wed Apr  7 21:09:49 2010
+++ /sys/src/cmd/mk/run.c	Wed Apr  7 21:09:32 2010
@@ -69,14 +69,14 @@
 				if(!(n->flags&VIRTUAL))
 					touch(n->name);
 				else if(explain)
-					Bprint(&bout, "no touch of virtual '%s'\n", n->name);
+					Bprint(&bout, "no touch of virtual %q\n", n->name);
 			}
 			n->time = time((long *)0);
 			MADESET(n, MADE);
 		}
 	} else {
 		if(DEBUG(D_EXEC))
-			fprint(1, "recipe='%s'\n", j->r->recipe);	/**/
+			fprint(1, "recipe=%q\n", j->r->recipe);	/**/
 		Bflush(&bout);
 		if(j->r->attr&NOMINUSE)
 			flags = 0;
@@ -154,7 +154,7 @@
 			if(n->flags&DELETE){
 				if(done++ == 0)
 					fprint(2, ", deleting");
-				fprint(2, " '%s'", n->name);
+				fprint(2, " %q", n->name);
 				delete(n->name);
 			}
 		fprint(2, "\n");
--- /sys/src/cmd/mk/rule.c	Wed Apr  7 21:10:10 2010
+++ /sys/src/cmd/mk/rule.c	Wed Apr  7 21:10:01 2010
@@ -75,12 +75,12 @@
 {
 	Bprint(&bout, "%s: start=%p\n", s, r);
 	for(; r; r = r->next){
-		Bprint(&bout, "\tRule %p: %s:%d attr=%x next=%p chain=%p alltarget='%s'",
+		Bprint(&bout, "\tRule %p: %s:%d attr=%x next=%p chain=%p alltarget=%q",
 			r, r->file, r->line, r->attr, r->next, r->chain, wtos(r->alltargets, ' '));
 		if(r->prog)
-			Bprint(&bout, " prog='%s'", r->prog);
+			Bprint(&bout, " prog=%q", r->prog);
 		Bprint(&bout, "\n\ttarget=%s: %s\n", r->target, wtos(r->tail,' '));
-		Bprint(&bout, "\trecipe@%p='%s'\n", r->recipe, r->recipe);
+		Bprint(&bout, "\trecipe@%p=%q\n", r->recipe, r->recipe);
 	}
 }
 
--- /sys/src/cmd/mk/main.c	Wed Apr  7 21:10:22 2010
+++ /sys/src/cmd/mk/main.c	Wed Apr  7 21:10:15 2010
@@ -35,6 +35,8 @@
 	Bufblock *buf;
 	Bufblock *whatif;
 
+	quotefmtinstall();
+
 	/*
 	 *  start with a copy of the current environment variables
 	 *  instead of sharing them
--- /sys/src/cmd/mk/job.c	Wed Apr  7 21:10:45 2010
+++ /sys/src/cmd/mk/job.c	Wed Apr  7 21:10:29 2010
@@ -24,9 +24,9 @@
 {
 	Bprint(&bout, "%s\n", s);
 	while(j){
-		Bprint(&bout, "job@%p: r=%p n=%p stem='%s' nproc=%d\n",
+		Bprint(&bout, "job@%p: r=%p n=%p stem=%q nproc=%d\n",
 			j, j->r, j->n, j->stem, j->nproc);
-		Bprint(&bout, "\ttarget='%s' alltarget='%s' prereq='%s' nprereq='%s'\n",
+		Bprint(&bout, "\ttarget=%q alltarget=%q prereq=%q nprereq=%q\n",
 			wtos(j->t, ' '), wtos(j->at, ' '), wtos(j->p, ' '), wtos(j->np, ' '));
 		j = all? j->next : 0;
 	}
--- /sys/src/cmd/mk/arc.c	Wed Apr  7 21:11:02 2010
+++ /sys/src/cmd/mk/arc.c	Wed Apr  7 21:10:49 2010
@@ -21,10 +21,10 @@
 {
 	char buf[1024];
 
-	Bprint(&bout, "%sArc@%p: n=%p r=%p flag=0x%x stem='%s'",
+	Bprint(&bout, "%sArc@%p: n=%p r=%p flag=0x%x stem=%q",
 		s, a, a->n, a->r, a->flag, a->stem);
 	if(a->prog)
-		Bprint(&bout, " prog='%s'", a->prog);
+		Bprint(&bout, " prog=%q", a->prog);
 	Bprint(&bout, "\n");
 
 	if(a->n){