From 56747386689484b92416f57f16fd0e30ad97210c Mon Sep 17 00:00:00 2001
From: Christopher Dunn <cdunn2001@gmail.com>
Date: Fri, 23 Mar 2007 06:12:28 +0000
Subject: [PATCH] [1611376]by reserving the max string-size when escaped chars
 exist, we should save some runtime.

---
 src/lib_json/json_writer.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 6fa5993..063a66f 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -70,7 +70,10 @@ std::string valueToQuotedString( const char *value )
    // We have to walk value and escape any special characters.
    // Appending to std::string is not efficient, but this should be rare.
    // (Note: forward slashes are *not* rare, but I am not escaping them.)
-   std::string result("\"");
+   unsigned maxsize = strlen(value)*2 + 3; // allescaped+quotes+NULL
+   std::string result;
+   result.reserve(maxsize); // to avoid lots of mallocs
+   result += "\"";
    for (const char* c=value; *c != 0; ++c){
       switch(*c){
          case '\"':
@@ -102,7 +105,8 @@ std::string valueToQuotedString( const char *value )
 	    result += *c;
       }
    }
-   return result + "\"";
+   result += "\"";
+   return result;
 }
 
 // Class Writer