From f4f6d906733027a7bd802e035b3e9852db7be967 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 15 Sep 2016 21:49:24 +0300
Subject: Add process::print()

---
 butl/process.cxx | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'butl/process.cxx')

diff --git a/butl/process.cxx b/butl/process.cxx
index e13a8cd..38948a1 100644
--- a/butl/process.cxx
+++ b/butl/process.cxx
@@ -37,6 +37,7 @@
 #include <cassert>
 #include <cstddef> // size_t
 #include <cstring> // strlen(), strchr()
+#include <ostream>
 
 #include <butl/utility>  // casecmp()
 #include <butl/fdstream> // fdnull(), fdclose()
@@ -120,6 +121,43 @@ namespace butl
     return r;
   }
 
+  void process::
+  print (ostream& o, const char* const args[], size_t n)
+  {
+    size_t m (0);
+    const char* const* p (args);
+    do
+    {
+      if (m != 0)
+        o << " |"; // Trailing space will be added inside the loop.
+
+      for (m++; *p != nullptr; p++, m++)
+      {
+        if (p != args)
+          o << ' ';
+
+        // Quote if empty or contains spaces.
+        //
+        bool q (**p == '\0' || strchr (*p, ' ') != nullptr);
+
+        if (q)
+          o << '"';
+
+        o << *p;
+
+        if (q)
+          o << '"';
+      }
+
+      if (m < n) // Can we examine the next element?
+      {
+        p++;
+        m++;
+      }
+
+    } while (*p != nullptr);
+  }
+
 #ifndef _WIN32
 
   static process_path
-- 
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