/*! \brief Resize an area within an msgb
*
* This resizes a sub area of the msgb data and adjusts the pointers (incl
* l1h-l4h) accordingly. The cb part is not updated. If the area is extended,
* the contents of the extension is undefined. The complete sub area must be a
* part of [data,tail].
*
* \param[inout] msg The msgb object
* \param[in] area A pointer to the sub-area
* \param[in] old_size The old size of the sub-area
* \param[in] new_size The new size of the sub-area
* \returns 0 on success, -1 if there is not enough space to extend the area
*/
int msgb_resize_area(struct msgb *msg, uint8_t *area,
int old_size, int new_size)
{
int rc;
uint8_t *post_start = area + old_size;
int pre_len = area - msg->data;
int post_len = msg->len - old_size - pre_len;
int delta_size = new_size - old_size;
if (old_size < 0 || new_size < 0)
MSGB_ABORT(msg, "Negative sizes are not allowed\n");
if (area < msg->data || post_start > msg->tail)
MSGB_ABORT(msg, "Sub area is not fully contained in the msg data\n");
if (delta_size == 0)
return 0;
if (delta_size > 0) {
rc = msgb_trim(msg, msg->len + delta_size);
if (rc < 0)
return rc;
}
memmove(area + new_size, area + old_size, post_len);
if (msg->l1h >= post_start)
msg->l1h += delta_size;
if (msg->l2h >= post_start)
msg->l2h += delta_size;
if (msg->l3h >= post_start)
msg->l3h += delta_size;
if (msg->l4h >= post_start)
msg->l4h += delta_size;
if (delta_size < 0)
msgb_trim(msg, msg->len + delta_size);
return 0;
}
static int osmo_stats_reporter_statsd_send(struct osmo_stats_reporter *srep,
const char *name1, unsigned int index1, const char *name2, int64_t value,
const char *unit)
{
char *buf;
int buf_size;
int nchars, rc = 0;
char *fmt = NULL;
char *prefix = srep->name_prefix;
int old_len = msgb_length(srep->buffer);
if (prefix) {
if (name1) {
if (index1 != 0)
fmt = "%1$s.%2$s.%6$u.%3$s:%4$d|%5$s";
else
fmt = "%1$s.%2$s.%3$s:%4$d|%5$s";
} else {
fmt = "%1$s.%2$0.0s%3$s:%4$d|%5$s";
}
} else {
prefix = "";
if (name1) {
if (index1 != 0)
fmt = "%1$s%2$s.%6$u.%3$s:%4$d|%5$s";
else
fmt = "%1$s%2$s.%3$s:%4$d|%5$s";
} else {
fmt = "%1$s%2$0.0s%3$s:%4$d|%5$s";
}
}
if (srep->agg_enabled) {
if (msgb_length(srep->buffer) > 0 &&
msgb_tailroom(srep->buffer) > 0)
{
msgb_put_u8(srep->buffer, '\n');
}
}
buf = (char *)msgb_put(srep->buffer, 0);
buf_size = msgb_tailroom(srep->buffer);
nchars = snprintf(buf, buf_size, fmt,
prefix, name1, name2,
value, unit, index1);
if (nchars >= buf_size) {
/* Truncated */
/* Restore original buffer (without trailing LF) */
msgb_trim(srep->buffer, old_len);
/* Send it */
rc = osmo_stats_reporter_send_buffer(srep);
/* Try again */
buf = (char *)msgb_put(srep->buffer, 0);
buf_size = msgb_tailroom(srep->buffer);
nchars = snprintf(buf, buf_size, fmt,
prefix, name1, name2,
value, unit, index1);
if (nchars >= buf_size)
return -EMSGSIZE;
}
if (nchars > 0)
msgb_trim(srep->buffer, msgb_length(srep->buffer) + nchars);
if (!srep->agg_enabled)
rc = osmo_stats_reporter_send_buffer(srep);
return rc;
}
