[boost] [iostreams] Fixes for copy.hpp

From: Andrew Walrond (andrew_at_[hidden])
Date: 2006-01-11 10:13:26

Does this patch look correct? I have been trying to extend the copy algorithm 
using the Boost::parameter library, and these couple things looked wrong to me.

Andrew Walrond

--- /include/boost/iostreams/copy.hpp   2005-05-26 09:37:30.000000000 +0100
+++ copy.hpp    2006-01-11 14:51:15.000000000 +0000
@@ -49,7 +49,7 @@
     typedef pair<char_type*, char_type*>         pair_type;
     pair_type p1 = iostreams::input_sequence(src);
     pair_type p2 = iostreams::output_sequence(snk);
-    if (p1.second - p1.first < p2.second - p2.first) {
+    if (p1.second - p1.first <= p2.second - p2.first) {
         std::copy(p1.first, p1.second, p2.first);
         return static_cast<streamsize>(p1.second - p1.first);
     } else {
@@ -92,9 +92,10 @@
     while (!done) {
         streamsize amt;
         done = (amt = iostreams::read(src, buf.data(), buffer_size)) == -1;
-        std::copy(buf.data(), buf.data() + amt, p.first + total);
-        if (amt != -1)
+        if (amt != -1) {
+                       std::copy(buf.data(), buf.data() + amt, p.first + total);
             total += amt;
+               }
     }
     return total;
 }