From 6e8b79ebd8186be3e955bb26877f72f45292edf7 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Wed, 16 Oct 2013 17:54:29 +0100
Subject: [PATCH] Add -s support for du(1)

---
 du.1 |  3 +++
 du.c | 22 +++++++++++++++++-----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/du.1 b/du.1
index a5046e1..932e693 100644
--- a/du.1
+++ b/du.1
@@ -16,3 +16,6 @@ directory is displayed.
 .TP
 .BI \-a
 Display an entry for each file in the file hierarchy.
+.TP
+.BI \-s
+Display only the grand total for the specified files.
diff --git a/du.c b/du.c
index bfb40e6..3c6461b 100644
--- a/du.c
+++ b/du.c
@@ -14,8 +14,10 @@
 static long blksize = 512;
 
 static bool aflag = false;
+static bool sflag = false;
 
 static long du(const char *);
+static void print(long n, char *path);
 
 void
 usage(void)
@@ -27,11 +29,15 @@ int
 main(int argc, char *argv[])
 {
 	char *bsize;
+	long n;
 
 	ARGBEGIN {
 	case 'a':
 		aflag = true;
 		break;
+	case 's':
+		sflag = true;
+		break;
 	default:
 		usage();
 	} ARGEND;
@@ -41,10 +47,15 @@ main(int argc, char *argv[])
 		blksize = estrtol(bsize, 0);
 
 	if (argc < 1) {
-		du(".");
+		n = du(".");
+		if (sflag)
+			print(n, realpath(".", NULL));
 	} else {
-		for (; argc > 0; argc--, argv++)
-			du(argv[0]);
+		for (; argc > 0; argc--, argv++) {
+			n = du(argv[0]);
+			if (sflag)
+				print(n, realpath(argv[0], NULL));
+		}
 	}
 	return EXIT_SUCCESS;
 }
@@ -106,7 +117,7 @@ du(const char *path)
 				} else {
 					m = 512 * st.st_blocks / blksize;
 					n += m;
-					if (aflag)
+					if (aflag && !sflag)
 						print(m, realpath(dent->d_name, NULL));
 				}
 			}
@@ -115,6 +126,7 @@ du(const char *path)
 		}
 	}
 
-	print(n, realpath(path, NULL));
+	if (!sflag)
+		print(n, realpath(path, NULL));
 	return n;
 }