summaryrefslogtreecommitdiffstats
path: root/qemu/roms/ipxe/src/include/stddef.h
diff options
context:
space:
mode:
authorDon Dugger <n0ano@n0ano.com>2016-06-03 03:33:22 +0000
committerGerrit Code Review <gerrit@172.30.200.206>2016-06-03 03:33:23 +0000
commitda27230f80795d0028333713f036d44c53cb0e68 (patch)
treeb3d379eaf000adf72b36cb01cdf4d79c3e3f064c /qemu/roms/ipxe/src/include/stddef.h
parent0e68cb048bb8aadb14675f5d4286d8ab2fc35449 (diff)
parent437fd90c0250dee670290f9b714253671a990160 (diff)
Merge "These changes are the raw update to qemu-2.6."
Diffstat (limited to 'qemu/roms/ipxe/src/include/stddef.h')
-rw-r--r--qemu/roms/ipxe/src/include/stddef.h40
1 files changed, 29 insertions, 11 deletions
diff --git a/qemu/roms/ipxe/src/include/stddef.h b/qemu/roms/ipxe/src/include/stddef.h
index bf792771f..3c056294f 100644
--- a/qemu/roms/ipxe/src/include/stddef.h
+++ b/qemu/roms/ipxe/src/include/stddef.h
@@ -1,25 +1,43 @@
#ifndef STDDEF_H
#define STDDEF_H
-FILE_LICENCE ( GPL2_ONLY );
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-/* for size_t */
#include <stdint.h>
+/** EFI headers also define NULL */
#undef NULL
-#define NULL ((void *)0)
-#undef offsetof
-#if ( defined ( __GNUC__ ) && ( __GNUC__ > 3 ) )
-#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
+/** Null pointer */
+#define NULL ( ( void * ) 0 )
+
+/**
+ * Get offset of a field within a structure
+ *
+ * @v type Structure type
+ * @v field Field within structure
+ * @ret offset Offset within structure
+ */
+#if defined ( __GNUC__ ) && ( __GNUC__ > 3 )
+#define offsetof( type, field ) __builtin_offsetof ( type, field )
#else
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#define offsetof( type, field ) ( ( size_t ) &( ( ( type * ) NULL )->field ) )
#endif
-#undef container_of
-#define container_of(ptr, type, member) ({ \
- const typeof( ((type *)0)->member ) *__mptr = (ptr); \
- (type *)( (char *)__mptr - offsetof(type,member) );})
+/**
+ * Get containing structure
+ *
+ * @v ptr Pointer to contained field
+ * @v type Containing structure type
+ * @v field Field within containing structure
+ * @ret container Pointer to containing structure
+ */
+#define container_of( ptr, type, field ) ( { \
+ type *__container; \
+ const typeof ( __container->field ) *__field = (ptr); \
+ __container = ( ( ( void * ) __field ) - \
+ offsetof ( type, field ) ); \
+ __container; } )
/* __WCHAR_TYPE__ is defined by gcc and will change if -fshort-wchar is used */
#ifndef __WCHAR_TYPE__