From 156577ec401bddf5fbe5cffd989cf12f6312ffc3 Mon Sep 17 00:00:00 2001
From: Michael Gehring <mg@ebfe.org>
Date: Wed, 18 Jun 2014 12:36:12 +0200
Subject: [PATCH 1/2] sum: handle multiple file args

---
 sum/sum.rs | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/sum/sum.rs b/sum/sum.rs
index 048223406..735cbf380 100644
--- a/sum/sum.rs
+++ b/sum/sum.rs
@@ -111,23 +111,25 @@ pub fn uumain(args: Vec<String>) -> int {
 
     let sysv = matches.opt_present("sysv");
 
-    let file = if matches.free.is_empty() {
-        "-"
+    let files = if matches.free.is_empty() {
+        Vec::from_elem(1, "-".to_string())
     } else {
-        matches.free.get(0).as_slice()
+        matches.free
     };
 
-    let reader = match open(file) {
-        Ok(f) => f,
-        _ => crash!(1, "unable to open file")
-    };
-    let (blocks, sum) = if sysv {
-        sysv_sum(reader)
-    } else {
-        bsd_sum(reader)
-    };
+    for file in files.iter() {
+        let reader = match open(file.as_slice()) {
+            Ok(f) => f,
+            _ => crash!(1, "unable to open file")
+        };
+        let (blocks, sum) = if sysv {
+            sysv_sum(reader)
+        } else {
+            bsd_sum(reader)
+        };
 
-    println!("{} {}", sum, blocks);
+        println!("{} {}", sum, blocks);
+    }
 
     0
 }

From 7cdcb8bf97d1453579c62c6f09b83bbfe85729db Mon Sep 17 00:00:00 2001
From: Michael Gehring <mg@ebfe.org>
Date: Wed, 18 Jun 2014 12:38:19 +0200
Subject: [PATCH 2/2] sum: print filenames

---
 sum/sum.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sum/sum.rs b/sum/sum.rs
index 735cbf380..dabf2322e 100644
--- a/sum/sum.rs
+++ b/sum/sum.rs
@@ -117,6 +117,8 @@ pub fn uumain(args: Vec<String>) -> int {
         matches.free
     };
 
+    let print_names = sysv || files.len() > 1;
+
     for file in files.iter() {
         let reader = match open(file.as_slice()) {
             Ok(f) => f,
@@ -128,7 +130,11 @@ pub fn uumain(args: Vec<String>) -> int {
             bsd_sum(reader)
         };
 
-        println!("{} {}", sum, blocks);
+        if print_names {
+            println!("{} {} {}", sum, blocks, file);
+        } else {
+            println!("{} {}", sum, blocks);
+        }
     }
 
     0