From ed971e180e4112b90ba7322eb3a89ff6e385c2e1 Mon Sep 17 00:00:00 2001
From: Christopher Dunn <cdunn2001@gmail.com>
Date: Thu, 24 Jan 2008 20:09:48 +0000
Subject: [PATCH] Changed valueToString for floats so that zeroes after a
 decimal are truncated -- saves file size esp. for StyledStreamWriter which
 uses tabs instead of spaces.

---
 src/lib_json/json_writer.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 33b5cbc..4129984 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -55,6 +55,34 @@ std::string valueToString( double value )
 #else	
    sprintf(buffer, "%.16g", value); 
 #endif
+   char* ch = buffer + strlen(buffer) - 1;
+   if (*ch != '0') return buffer; // nothing to truncate, so save time
+   while(ch > buffer && *ch == '0'){
+     --ch;
+   }
+   char* last_nonzero = ch;
+   while(ch >= buffer){
+     switch(*ch){
+     case '0':
+     case '1':
+     case '2':
+     case '3':
+     case '4':
+     case '5':
+     case '6':
+     case '7':
+     case '8':
+     case '9':
+       --ch;
+       continue;
+     case '.':
+       // Truncate zeroes to save bytes in output, but keep one.
+       *(last_nonzero+2) = '\0';
+       return buffer;
+     default:
+       return buffer;
+     }
+   }
    return buffer;
 }