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make AST_LIST_REMOVE_HEAD safer to use

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6394 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2005-08-24 23:10:06 +00:00
parent a07997b961
commit 7950e4216e
1 changed files with 5 additions and 4 deletions
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9
include/asterisk/linkedlists.h
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@@ -305,14 +305,15 @@ struct { \
\param field This is the name of the field (declared using AST_LIST_ENTRY()) \param field This is the name of the field (declared using AST_LIST_ENTRY())
used to link entries of this list together. used to link entries of this list together.
Removes the head entry from the list, and returns a pointer to it. The Removes the head entry from the list, and returns a pointer to it.
forward-link pointer in the returned entry is \b not cleared. This macro This macro is safe to call on an empty list.
is safe to call on an empty list.
*/ */
#define AST_LIST_REMOVE_HEAD(head, field) ({ \ #define AST_LIST_REMOVE_HEAD(head, field) ({ \
typeof((head)->first) cur = (head)->first; \ typeof((head)->first) cur = (head)->first; \
if (cur) \ if (cur) { \
(head)->first = cur->field.next; \ (head)->first = cur->field.next; \
cur->field.next = NULL; \
} \
cur; \ cur; \
}) })