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 strtolog()          Return a logical representing a logical string
------------------------------------------------------------------------------
 Declaration
   string.hdr

 Syntax
   func logical strtolog extern
   param const char cLogical

 Arguments
   cLogical is a string to be converted to a logical.

 Return
   A logical corresponding to the passed string.

 Description
   The strtolog() function converts a string to a logical. The function
   returns .t. if the passed string parameter is ".T." or ".t.", while
   it returns .f. for any other string.

 Example
   #define EXAMPLE_STRING
   #include example.hdr

   proc Test_strtolog
   ? strtolog( ".T." )          // returns .t.
   ? strtolog( ".t." )          // returns .t.
   ? strtolog( ".F." )          // returns .f.
   ? strtolog( ".f." )          // returns .f.
   ? strtolog( ".T" )           // returns .f.
   ? strtolog( "T." )           // returns .f.
   ? strtolog( "hello" )        // returns .f.
   endproc

   proc main
   Test_strtolog()
   endproc