1 files changed, 58 insertions, 0 deletions
diff --git a/lib/ngtcp2_macro.h b/lib/ngtcp2_macro.h
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+++ b/lib/ngtcp2_macro.h
@@ -0,0 +1,58 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2017 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGTCP2_MACRO_H
+#define NGTCP2_MACRO_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <stddef.h>
+
+#include <ngtcp2/ngtcp2.h>
+
+#define ngtcp2_min(A, B) ((A) < (B) ? (A) : (B))
+#define ngtcp2_max(A, B) ((A) > (B) ? (A) : (B))
+
+#define ngtcp2_struct_of(ptr, type, member)                                    \
+  ((type *)(void *)((char *)(ptr)-offsetof(type, member)))
+
+/* ngtcp2_list_insert inserts |T| before |*PD|.  The contract is that
+   this is singly linked list, and the next element is pointed by next
+   field of the previous element.  |PD| must be a pointer to the
+   pointer to the next field of the previous element of |*PD|: if C is
+   the previous element of |PD|, PD = &C->next. */
+#define ngtcp2_list_insert(T, PD)                                              \
+  do {                                                                         \
+    (T)->next = *(PD);                                                         \
+    *(PD) = (T);                                                               \
+  } while (0)
+
+/*
+ * ngtcp2_arraylen returns the number of elements in array |A|.
+ */
+#define ngtcp2_arraylen(A) (sizeof(A) / sizeof(A[0]))
+
+#endif /* NGTCP2_MACRO_H */