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lib: native msg add array of strings support

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Signed-off-by: Christian Hopps <chopps@labn.net>
This commit is contained in:
Christian Hopps 2024-06-04 10:28:48 -04:00
parent 22eccbfab9
commit 33b73f8e3a
2 changed files with 58 additions and 0 deletions
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18
lib/mgmt_msg_native.c
View File

@ -6,6 +6,7 @@
*
*/
#include <zebra.h>
#include "darr.h"
#include "mgmt_msg_native.h"
DEFINE_MGROUP(MSG_NATIVE, "Native message allocations");
@ -50,3 +51,20 @@ int vmgmt_msg_native_send_error(struct msg_conn *conn, uint64_t sess_or_txn_id,
mgmt_msg_native_free_msg(msg);
return ret;
}
const char **_mgmt_msg_native_strings_decode(const void *_sdata, int sdlen)
{
const char *sdata = _sdata;
const char **strings = NULL;
int len;
if (sdata[sdlen - 1] != 0)
return NULL;
for (; sdlen; sdata += len, sdlen -= len) {
*darr_append(strings) = darr_strdup(sdata);
len = 1 + darr_strlen(strings[darr_lasti(strings)]);
}
return strings;
}

40
lib/mgmt_msg_native.h
View File

@ -524,6 +524,25 @@ extern int vmgmt_msg_native_send_error(struct msg_conn *conn,
p; \
})
/**
* mgmt_msg_native_add_str() - Append [another] string to the msg.
* @msg: (IN/OUT) Pointer to the native message, variable may be updated.
* @s: string to append.
*
* Append string @s to the native message @msg. @msg is assumed to have a
* sequence of NUL-terminated strings at the end of it. This function appends
* the string @s and it's NUL terminating octet to the message.
*
* NOTE: Be aware @msg pointer may change as a result of reallocating the
* message to fit the new data. Any other pointers into the old message should
* be discarded.
*/
#define mgmt_msg_native_add_str(msg, s) \
do { \
int __len = strlen(s) + 1; \
mgmt_msg_native_append(msg, s, __len); \
} while (0)
/**
* mgmt_msg_native_send_msg(msg, short_circuit_ok) - Send a native msg.
* @conn: the mgmt_msg connection.
@ -689,6 +708,27 @@ extern int vmgmt_msg_native_send_error(struct msg_conn *conn,
#define mgmt_msg_native_data_len_decode(msg, msglen) \
((msglen) - sizeof(*msg) - msg->vsplit)
/**
* mgmt_msg_native_strings_decode() - Get dynamic array of str ptrs from the msg.
* @msg: Pointer to the native message.
* @msglen: Length of the message.
* @sdata: pointer to the variable length string data at end of @msg.
*
* Given a pointer to a sequence of NUL-terminated strings allocate
* and return a dynamic array of dynamic array strings. This function
* can be used to decode a message that was built using
* mgmt_msg_native_add_str().
*
* Return: a dynamic array (darr) of string pointers, or NULL if the message
* is corrupt.
*/
#define mgmt_msg_native_strings_decode(msg, msg_len, sdata) \
_mgmt_msg_native_strings_decode(sdata, \
(msg_len) - ((sdata) - (char *)(msg)))
extern const char **_mgmt_msg_native_strings_decode(const void *sdata,
int sdlen);
#ifdef __cplusplus
}
#endif