Erich Hoover : include: Add macros for retrieving control message headers.
Alexandre Julliard
julliard at winehq.org
Wed Nov 3 11:37:04 CDT 2010
Module: wine
Branch: master
Commit: cac2c176efd85c06b55dfebb623be66ad548b317
URL: http://source.winehq.org/git/wine.git/?a=commit;h=cac2c176efd85c06b55dfebb623be66ad548b317
Author: Erich Hoover <ehoover at mines.edu>
Date: Tue Nov 2 16:35:04 2010 -0600
include: Add macros for retrieving control message headers.
---
include/ws2def.h | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/include/ws2def.h b/include/ws2def.h
index 00b10ab..8c1fc4a 100644
--- a/include/ws2def.h
+++ b/include/ws2def.h
@@ -78,4 +78,21 @@ typedef enum {
ScopeLevelGlobal = 14
} SCOPE_LEVEL;
+/*
+ * Macros for retrieving control message data returned by WSARecvMsg()
+ */
+#define WSA_CMSG_DATA(cmsg) ((UCHAR*)((WSACMSGHDR*)(cmsg)+1))
+#define WSA_CMSG_FIRSTHDR(mhdr) ((mhdr)->Control.len >= sizeof(WSACMSGHDR) ? (WSACMSGHDR *) (mhdr)->Control.buf : (WSACMSGHDR *) 0)
+#define WSA_CMSG_ALIGN(len) (((len) + sizeof(SIZE_T) - 1) & ~(sizeof(SIZE_T) - 1))
+/*
+ * Next Header: If the response is too short (or the next message in the response
+ * is too short) then return NULL, otherwise return the next control message.
+ */
+#define WSA_CMSG_NXTHDR(mhdr,cmsg) \
+ (!(cmsg) ? WSA_CMSG_FIRSTHDR(mhdr) : \
+ ((mhdr)->Control.len < sizeof(WSACMSGHDR) ? NULL : \
+ (((unsigned char*)(((WSACMSGHDR*)((unsigned char*)cmsg + WSA_CMSG_ALIGN(cmsg->cmsg_len)))+1) > ((unsigned char*)(mhdr)->Control.buf + (mhdr)->Control.len)) ? NULL : \
+ (((unsigned char*)cmsg + WSA_CMSG_ALIGN(cmsg->cmsg_len)+WSA_CMSG_ALIGN(((WSACMSGHDR*)((unsigned char*)cmsg + WSA_CMSG_ALIGN(cmsg->cmsg_len)))->cmsg_len) > ((unsigned char*)(mhdr)->Control.buf + (mhdr)->Control.len)) ? NULL : \
+ (WSACMSGHDR*)((unsigned char*)cmsg + WSA_CMSG_ALIGN(cmsg->cmsg_len))))))
+
#endif /* _WS2DEF_ */
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