implicit whitespace shift parameter identification

Author: jalvesz

src/stdlib_ascii.fypp

@@ -223,7 +223,7 @@ contains
     pure function char_to_lower(c) result(t)
         character(len=1), intent(in) :: c !! A character.
         character(len=1)             :: t
-        integer, parameter :: wp= 32, BA=iachar('A'), BZ=iachar('Z')
+        integer, parameter :: wp= iachar('a')-iachar('A'), BA=iachar('A'), BZ=iachar('Z')
         integer :: k
         !Check whether the integer equivalent is between BA=65 and BZ=90
         k = ichar(c) 
@@ -237,7 +237,7 @@ contains
     pure function char_to_upper(c) result(t)
         character(len=1), intent(in) :: c !! A character.
         character(len=1)             :: t
-        integer, parameter :: wp= 32, la=iachar('a'), lz=iachar('z')
+        integer, parameter :: wp= iachar('a')-iachar('A'), la=iachar('a'), lz=iachar('z')
         integer :: k
         !Check whether the integer equivalent is between la=97 and lz=122
         k = ichar(c)