alien.c-types: Add c-type-signed to protocol, which is true for signed

types. Use c-type-signed in classes.struct.

basis/alien/c-types/c-types.factor

@@ -26,6 +26,7 @@ TUPLE: abstract-c-type
 { getter callable }
 { setter callable }
 { size integer }
+{ signed boolean }
 { align integer }
 { align-first integer } ;
 
@@ -94,6 +95,10 @@ GENERIC: c-type-setter ( name -- quot )
 
 M: c-type c-type-setter setter>> ;
 
+GENERIC: c-type-signed ( name -- boolean ) foldable
+
+M: abstract-c-type c-type-signed signed>> ;
+
 GENERIC: c-type-align ( name -- n ) foldable
 
 M: abstract-c-type c-type-align align>> ;
@@ -143,6 +148,7 @@ PROTOCOL: c-type-protocol
     c-type-getter
     c-type-copier
     c-type-setter
+    c-type-signed
     c-type-align
     c-type-align-first
     base-type
@@ -236,6 +242,7 @@ M: pointer lookup-c-type
         [ alien-signed-2 ] >>getter
         [ set-alien-signed-2 ] >>setter
         2 >>size
+        t >>signed
         2 >>align
         2 >>align-first
         "from_signed_2" >>boxer
@@ -262,6 +269,7 @@ M: pointer lookup-c-type
         [ alien-signed-1 ] >>getter
         [ set-alien-signed-1 ] >>setter
         1 >>size
+        t >>signed
         1 >>align
         1 >>align-first
         "from_signed_1" >>boxer
@@ -316,6 +324,7 @@ M: pointer lookup-c-type
             [ alien-signed-4 ] >>getter
             [ set-alien-signed-4 ] >>setter
             4 >>size
+            t >>signed
             4 >>align
             4 >>align-first
             "from_signed_4" >>boxer
@@ -342,6 +351,7 @@ M: pointer lookup-c-type
             [ alien-signed-cell ] >>getter
             [ set-alien-signed-cell ] >>setter
             8 >>size
+            t >>signed
             8 >>align
             8 >>align-first
             "from_signed_cell" >>boxer
@@ -382,6 +392,7 @@ M: pointer lookup-c-type
             [ alien-signed-cell ] >>getter
             [ set-alien-signed-cell ] >>setter
             4 >>size
+            t >>signed
             4 >>align
             4 >>align-first
             "from_signed_cell" >>boxer
@@ -408,6 +419,7 @@ M: pointer lookup-c-type
             [ alien-signed-8 ] >>getter
             [ set-alien-signed-8 ] >>setter
             8 >>size
+            t >>signed
             8-byte-alignment
             "from_signed_8" >>boxer
             "to_signed_8" >>unboxer
@@ -463,8 +475,8 @@ M: double-2-rep rep-component-type drop double ;
 : c-type-interval ( c-type -- from to )
     {
         { [ dup { float double } member-eq? ] [ drop -1/0. 1/0. ] }
-        { [ dup { char short int long longlong } member-eq? ] [ signed-interval ] }
-        { [ dup { uchar ushort uint ulong ulonglong } member-eq? ] [ unsigned-interval ] }
+        { [ dup c-type-signed ] [ signed-interval ] }
+        { [ dup c-type-signed not ] [ unsigned-interval ] }
     } cond ; foldable
 
 : c-type-clamp ( value c-type -- value' )

basis/classes/struct/struct.factor

@@ -344,11 +344,7 @@ ERROR: bad-type-for-bits type ;
 :: set-bits ( slot-spec n -- slot-spec )
     struct-bit-slot-spec new
         n >>bits
-        slot-spec type>> {
-            { int [ t ] }
-            { uint [ f ] }
-            [ bad-type-for-bits ]
-        } case >>signed?
+        slot-spec type>> c-type-signed >>signed?
         slot-spec name>> >>name
         slot-spec class>> >>class
         slot-spec type>> >>type