Implementing offsetof

fedi-nabli · Apr 6, 2024 · 06e497f · 06e497f
1 parent 8c10788
commit 06e497f
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Showing 5 changed files with 12 additions and 2 deletions.
diff --git a/fd_includes/stddef.h b/fd_includes/stddef.h
@@ -0,0 +1,8 @@
+#ifndef STDDEF_H
+#define STDDEF_H
+
+#include "stddef-internal.h"
+
+#define offsetof(TYPE, MEMBER) &((TYPE*)0x00)->MEMBER
+
+#endif
diff --git a/fd_includes/.keep → ...ocessor/static-includes/stdarg-internal.h b/fd_includes/.keep → ...ocessor/static-includes/stdarg-internal.h
diff --git a/preprocessor/static-includes/stddef-internal.h b/preprocessor/static-includes/stddef-internal.h
diff --git a/preprocessor/static-includes/stddef.c b/preprocessor/static-includes/stddef.c
@@ -3,5 +3,5 @@
 
 void preprocessor_stddef_internal_include(struct preprocessor* preprocessor, struct preprocessor_included_file* file)
 {
-  #warning "Implement stddef"
+  // Do nothing
 }
diff --git a/test.c b/test.c
@@ -1,3 +1,5 @@
+#include <stddef.h>
+
 struct dog
 {
   int x;
@@ -6,5 +8,5 @@ struct dog
 
 int main()
 {
-  return &((struct dog*)0x00)->y;
+  return offsetof(struct dog, y);
 }