X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Futil.h;h=a1d5657237368803ef9c6ab8e781d3670ddff132;hb=95d78c7e7c81a6b788f28c33ef2cafd87471a0d7;hp=08d556fc924a47aabe4c86d0554c49f3f39a40b0;hpb=af76d302c1e26f916494202f1b3663f15710bdcd;p=elogind.git

diff --git a/src/shared/util.h b/src/shared/util.h
index 08d556fc9..a1d565723 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -852,6 +852,22 @@ int unlink_noerrno(const char *path);
                 (void *) memset(_new_, 0, _len_);       \
         })
 
+#define alloca_align(size, align)                                       \
+        ({                                                              \
+                void *_ptr_;                                            \
+                size_t _mask_ = (align) - 1;                            \
+                _ptr_ = alloca((size) + _mask_);                        \
+                (void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_);         \
+        })
+
+#define alloca0_align(size, align)                                      \
+        ({                                                              \
+                void *_new_;                                            \
+                size_t _size_ = (size);                                 \
+                _new_ = alloca_align(_size_, (align));                  \
+                (void*)memset(_new_, 0, _size_);                        \
+        })
+
 #define strappenda(a, ...)                                       \
         ({                                                       \
                 int _len = strlen(a);                            \