sed -f - should read from stdin.

2 files changed, 3 insertions, 1 deletions

diff --git a/tests/sed.test b/tests/sed.test
index 7a4a8cda..822cfa37 100755
--- a/tests/sed.test
+++ b/tests/sed.test
@@ -127,6 +127,7 @@ testing "blank pattern repeats last pattern" \
 
 testing "" "sed -e '1a\' -e 'huh'" "meep\nhuh\n" "" "meep"
 testing "" "sed -f input" "blah\nboom\n" '1a\\\nboom' 'blah'
+testing "" "sed -f - input" "blah\nboom\n" 'blah' '1a\\\nboom'
 testing "" "sed '1a\
 hello'" "merp\nhello\n" "" "merp"
 
diff --git a/toys/posix/sed.c b/toys/posix/sed.c
index e1c00bab..bafe77c4 100644
--- a/toys/posix/sed.c
+++ b/toys/posix/sed.c
@@ -1045,7 +1045,8 @@ void sed_main(void)
   for (dworkin = TT.e; dworkin; dworkin = dworkin->next)
     jewel_of_judgement(&dworkin->arg, strlen(dworkin->arg));
   for (dworkin = TT.f; dworkin; dworkin = dworkin->next)
-    do_lines(xopen(dworkin->arg, O_RDONLY), dworkin->arg, jewel_of_judgement);
+    do_lines(strcmp(dworkin->arg, "-") ? xopen(dworkin->arg, O_RDONLY) : 0,
+      dworkin->arg, jewel_of_judgement);
   jewel_of_judgement(0, 0);
   dlist_terminate(TT.pattern);
   if (TT.nextlen) error_exit("no }");