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[9front] walk: properly format permissions
This patch adds dirmodefmt from fcall.h to pretty-print file
permissions, similarly to ls -l. I didn't notice any performance
degradation.

I hope no-one relied on the old behaviour.

--- a/sys/man/1/walk

+++ b/sys/man/1/walk

@@ -123,8 +123,6 @@

 .IR ls (1),

 .IR du (1)

 .SH BUGS

-Statfmt character `x' displays permissions as an integer.

-.PP

 Manipulating ifs is a nuisance.

 .PP

 File names are assumed to not contain newlines.

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

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

@@ -2,6 +2,7 @@

 #include <libc.h>

 #include <bio.h>

 #include <String.h>

+#include <fcall.h>

 int Cflag = 0;

 int uflag = 0;

@@ -70,7 +71,7 @@

 			break;

 		case 'q': Bprint(bout, "%ullx.%uld.%.2uhhx", f->qid.path, f->qid.vers, f->qid.type); break;

 		case 's': Bprint(bout, "%lld", f->length); break;

-		case 'x': Bprint(bout, "%ulo", f->mode); break;

+		case 'x': Bprint(bout, "%M", f->mode); break;

 		/* These two  are slightly different, as they tell us about the fileserver instead of the file */

 		case 'D': Bprint(bout, "%ud", f->dev); break;

@@ -249,6 +250,8 @@

 	default:

 		usage();

 	}ARGEND;

+

+	fmtinstall('M', dirmodefmt);

 	if((bout = Bfdopen(1, OWRITE)) == nil)

 		sysfatal("Bfdopen: %r");