paste: fix output when file lengths differ

If the files being pasted had different numbers of lines the
output was incorrect.

Rewrite the loop over all lines to allow for this.  Add tests for
such conditions.

Adds 64-80 bytes.

(GitHub issue #542)

2 files changed, 38 insertions, 0 deletions

diff --git a/testsuite/paste/paste-long-short b/testsuite/paste/paste-long-short
new file mode 100644
index 000000000..e626d730e
--- /dev/null
+++ b/testsuite/paste/paste-long-short
@@ -0,0 +1,19 @@
+cat > foo <<EOF
+foo1
+foo2
+foo3
+EOF
+
+cat > bar <<EOF
+bar1
+bar2
+EOF
+
+cat > baz <<EOF
+foo1    bar1
+foo2    bar2
+foo3    
+EOF
+
+busybox paste foo bar > qux
+diff -u baz qux
diff --git a/testsuite/paste/paste-short-long b/testsuite/paste/paste-short-long
new file mode 100644
index 000000000..785da60a7
--- /dev/null
+++ b/testsuite/paste/paste-short-long
@@ -0,0 +1,19 @@
+cat > foo <<EOF
+foo1
+foo2
+EOF
+
+cat > bar <<EOF
+bar1
+bar2
+bar3
+EOF
+
+cat > baz <<EOF
+foo1    bar1
+foo2    bar2
+        bar3
+EOF
+
+busybox paste foo bar > qux
+diff -u baz qux