From 25dff2b7dbab54bd97b5ec22a05e594504555a12 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 15 Mar 2017 14:40:47 +0100
Subject: runProgram(): Distinguish between empty input and no input

For example, if we call brotli with an empty input, it shouldn't read
from the caller's stdin.
---
 src/libutil/util.hh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/libutil/util.hh')

diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index b74c1d41739a..4e3a011b349c 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -14,6 +14,7 @@
 #include <cstdio>
 #include <map>
 #include <sstream>
+#include <experimental/optional>
 
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #define DT_UNKNOWN 0
@@ -232,7 +233,8 @@ pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = P
 /* Run a program and return its stdout in a string (i.e., like the
    shell backtick operator). */
 string runProgram(Path program, bool searchPath = false,
-    const Strings & args = Strings(), const string & input = "");
+    const Strings & args = Strings(),
+    const std::experimental::optional<std::string> & input = {});
 
 class ExecError : public Error
 {
-- 
cgit 1.4.1