ddemangle, use FPC compat string too

dexed-d/src/common.d

@@ -464,12 +464,12 @@ public:
         alias RT    = FpcArray!T;
         enum isChar = is(Unqual!T == char);
         size_t len  = size_t.sizeof * 2 + T.sizeof * array.length + ubyte(isChar);
-        void* mem   = getMem(len);
+        auto mem    = cast(Unqual!T*) getMem(len);
         // init refcount to -1 and length to izArray length
         *cast(size_t*) (mem + 0            ) = -1;
         *cast(size_t*) (mem + size_t.sizeof) = array.length;
         // copy izArray data
-        mem[size_t.sizeof * 2 .. len - ubyte(isChar)] = array.ptr[0.. array.length * T.sizeof];
+        mem[size_t.sizeof * 2 .. len - ubyte(isChar)] = (cast(T*) array.ptr)[0.. array.length * T.sizeof];
         // FreePascal specifies that strings are guaranteed to be zero terminated.
         static if (isChar)
             *cast(char*) (mem + len - 1) = '\0';

dexed-d/src/ddemangle.d

@@ -3,11 +3,11 @@ module ddemangle;
 import core.demangle    : demangle;
 import std.regex        : replaceAll, Captures, regex, Regex;
 import core.stdc.string : strlen;
-import std.string       : toStringz;
+import common           : FpcArray;
 
 extern(C):
 
-export const(char)* ddemangle(const(char)* line)
+export FpcArray!(const(char))* ddemangle(const(char)* line)
 {
     __gshared Regex!char reDemangle;
     __gshared bool reInit;
@@ -16,7 +16,9 @@ export const(char)* ddemangle(const(char)* line)
         reInit = true;
         reDemangle = regex(r"\b_?_D[0-9a-zA-Z_]+\b");
     }
-    return replaceAll!(demangleMatch)(line[0 .. line.strlen], reDemangle).toStringz;
+    return FpcArray!(const(char)).fromArray(
+        replaceAll!(demangleMatch)(line[0 .. line.strlen], reDemangle)
+    );
 }
 
 extern(D): private:

src/u_ddemangle.pas

@@ -24,7 +24,7 @@ begin
     s := pchar(value);
     // note, assign to result has for effect to alloc a FPC string
     // (by implicit convertion) so the D memory is not used.
-    result := ddemangle(s);
+    result := string(ddemangle(s));
     minimizeGcHeap();
   end
   else

src/u_dexed_d.pas

@@ -62,7 +62,7 @@ procedure minimizeGcHeap(const now: boolean = false); cdecl; external libdexedd_
 // noop
 procedure setRtOptions(); cdecl; external libdexedd_name;
 // Demangle a line possibly containing a D mangled name.
-function ddemangle(const text: PChar): PChar; cdecl; external libdexedd_name;
+function ddemangle(const text: PChar): pointer; cdecl; external libdexedd_name;
 // Detects wether the source code for the module `src` contains the main() function.
 function hasMainFun(const src: PChar): Boolean; cdecl; external libdexedd_name;
 // Returns the DDOC template for the declaration location at `caretLine` in the source code `src`.