From f19fe76dde04cb4e37fc4bf07ccb441d5e76ad3b Mon Sep 17 00:00:00 2001
From: Jeff Garland <jeff@crystalclearsoftware.com>
Date: Wed, 12 Nov 2003 02:58:06 +0000
Subject: [PATCH] fixes for tolower issues

[SVN r20789]
---
 include/boost/date_time/compiler_config.hpp |  4 ---
 include/boost/date_time/date_parsing.hpp    | 36 +++++++++++++++++----
 2 files changed, 30 insertions(+), 10 deletions(-)

diff --git a/include/boost/date_time/compiler_config.hpp b/include/boost/date_time/compiler_config.hpp
index 258851d..666e90a 100644
--- a/include/boost/date_time/compiler_config.hpp
+++ b/include/boost/date_time/compiler_config.hpp
@@ -31,10 +31,6 @@
 #define INT64_C(value)  int64_t(value)
 #endif
 
-//Workaround for missing transform
-#if (defined(__BORLANDC__) || (defined(BOOST_MSVC) && (_MSC_VER <= 1200)))
-#define BOOST_DATE_TIME_NO_STD_TRANSFORM  1
-#endif
 
 /* Workaround for Borland iterator error. Error was "Cannot convert 'istream *' to 'wistream *' in function istream_iterator<>::istream_iterator() */
 #if defined(__BORLANDC__) && (__BORLANDC__ <= 0x0551)
diff --git a/include/boost/date_time/date_parsing.hpp b/include/boost/date_time/date_parsing.hpp
index 9725f2d..e1c4ddd 100644
--- a/include/boost/date_time/date_parsing.hpp
+++ b/include/boost/date_time/date_parsing.hpp
@@ -14,10 +14,39 @@
 #include <algorithm>
 #include <cctype>
 
+#if !defined(BOOST_NO_STD_LOCALE)
+#include <locale>
+#endif
+
 namespace boost {
 
 namespace date_time {
 
+  //! A function to replace the std::transform( , , ,tolower) construct
+  /*! This function simply takes a string, and changes all the characters
+   * in that string to lowercase (according to the default system locale).
+   * In the event that a compiler does not support locales, the old 
+   * C style tolower() is used.
+   */
+  inline
+  std::string convert_to_lower(const std::string& inp)
+  {
+    std::string tmp("");
+    unsigned i = 0;
+#if defined(BOOST_NO_STD_LOCALE)
+    while(i < inp.length())
+    {
+      tmp += static_cast<char>(tolower(inp.at(i++)));
+#else
+    std::locale loc("");
+    while(i < inp.length())
+    {
+      tmp += std::tolower(inp.at(i++), loc);
+#endif
+    }
+    return std::string(tmp);
+  }
+
   //! Generic function to parse a delimited date (eg: 2002-02-10)
   /*! Accepted formats are: "2003-02-10" or " 2003-Feb-10" or
    * "2003-Feburary-10" 
@@ -52,12 +81,7 @@ namespace date_time {
 	  else
           {
 	    typename month_type::month_map_ptr_type ptr = month_type::get_month_map_ptr();
-#if defined(BOOST_DATE_TIME_NO_STD_TRANSFORM)
-#else
-	    std::transform(s.begin(), s.end(),
-	                   s.begin(),
-			   tolower);
-#endif
+	    s = convert_to_lower(s);
 	    typename month_type::month_map_type::iterator iter = ptr->find(s);
 	    if(iter != ptr->end()) // required for STLport
 	    {