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qw/sys: use dir(f)stat in place of raw stat reading

--- a/qw/sys.c

+++ b/qw/sys.c

@@ -54,11 +54,14 @@

 int

 Sys_FileTime(char *path)

 {

-	uchar bs[1024];

+	Dir *d;

+	ulong t;

-	if(stat(path, bs, sizeof bs) < 0)

-		return -1;

-	return *((int *)(bs+2+2+4+1+4+8+4+4));	/* mtime[4] */

+	t = 0;

+	if((d = dirstat(path)) != nil)

+		t = d->mtime;

+	free(d);

+	return t;

 }

 int

@@ -79,13 +82,14 @@

 vlong

 flen(int fd)

 {

-	uchar bs[1024];

+	Dir *d;

+	vlong sz;

-	if(fstat(fd, bs, sizeof bs) < 0){

-		fprint(2, "flen:fstat: %r\n");

-		return -1;

-	}

-	return *((vlong *)(bs+2+2+4+1+4+8+4+4+4));	/* length[8] */

+	sz = -1;

+	if((d = dirfstat(fd)) != nil)

+		sz = d->length;

+	free(d);

+	return sz;

 }

 double