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callback: Add macro to iterate callbacks

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Signed-off-by: Aris Adamantiadis <aris@0xbadc0de.be>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Aris Adamantiadis
2015-07-22 09:28:20 +02:00
committed by Andreas Schneider
parent 6f3a7d36bb
commit e40e6e8686
1 changed files with 37 additions and 0 deletions
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37
include/libssh/callbacks.h
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@@ -463,6 +463,43 @@ typedef struct ssh_socket_callbacks_struct *ssh_socket_callbacks;
} \ } \
} while(0) } while(0)
/**
* @internal
*
* @brief iterate through a list of callback structures.
*
* This tests for their validity and give control back to the calling code to
* execute them. Caller can decide to break the loop or continue executing the
* callbacks with different parameters
*
* @code
* ssh_callbacks_iterate(channel->callbacks, ssh_channel_callbacks,
* channel_eof_function){
* rc = ssh_callbacks_iterate_exec(session, channel);
* if (rc != SSH_OK){
* break;
* }
* }
* ssh_callbacks_iterate_end();
* @endcode
*/
#define ssh_callbacks_iterate(_cb_list, _cb_type, _cb_name) \
do { \
struct ssh_iterator *_cb_i = ssh_list_get_iterator(_cb_list); \
_cb_type _cb; \
__typeof__(_cb->_cb_name) _cb_p; \
for (; _cb_i != NULL; _cb_i = _cb_i->next) { \
_cb = ssh_iterator_value(_cb_type, _cb_i); \
if (ssh_callbacks_exists(_cb, _cb_name) && \
(_cb_p = _cb->_cb_name))
#define ssh_callbacks_iterate_exec(...) \
_cb_p(__VA_ARGS__, _cb->userdata)
#define ssh_callbacks_iterate_end() \
} \
} while(0)
/** @brief Prototype for a packet callback, to be called when a new packet arrives /** @brief Prototype for a packet callback, to be called when a new packet arrives
* @param session The current session of the packet * @param session The current session of the packet
* @param type packet type (see ssh2.h) * @param type packet type (see ssh2.h)