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/*!
* core handler for dynamic strings.
* This is not meant to be called directly, but rather through the
* various wrapper macros
* ast_str_set(...)
* ast_str_append(...)
* ast_str_set_va(...)
* ast_str_append_va(...)
int __ast_str_helper(struct ast_str **buf, size_t max_len,
int append, const char *fmt, va_list ap)
int offset = (append && (*buf)->len) ? (*buf)->used : 0;
if (max_len < 0)
max_len = (*buf)->len; /* don't exceed the allocated space */
/*
* Ask vsnprintf how much space we need. Remember that vsnprintf
* does not count the final '\0' so we must add 1.
*/
res = vsnprintf((*buf)->str + offset, (*buf)->len - offset, fmt, ap);
/*
* If there is not enough space and we are below the max length,
* reallocate the buffer and return a message telling to retry.
*/
if (need > (*buf)->len && (max_len == 0 || (*buf)->len < max_len) ) {
if (max_len && max_len < need) /* truncate as needed */
else if (max_len == 0) /* if unbounded, give more room for next time */
need += 16 + need/4;
if (0) /* debugging */
ast_verbose("extend from %d to %d\n", (int)(*buf)->len, need);
if (ast_str_make_space(buf, need)) {
ast_verbose("failed to extend from %d to %d\n", (int)(*buf)->len, need);
return AST_DYNSTR_BUILD_FAILED;
(*buf)->str[offset] = '\0'; /* Truncate the partial write. */
Russell Bryant
committed
/* va_end() and va_start() must be done before calling
* vsnprintf() again. */
return AST_DYNSTR_BUILD_RETRY;
}
/* update space used, keep in mind the truncation */
(*buf)->used = (res + offset > (*buf)->len) ? (*buf)->len : res + offset;
void ast_enable_packet_fragmentation(int sock)
{
#if defined(HAVE_IP_MTU_DISCOVER)
int val = IP_PMTUDISC_DONT;
if (setsockopt(sock, IPPROTO_IP, IP_MTU_DISCOVER, &val, sizeof(val)))
ast_log(LOG_WARNING, "Unable to disable PMTU discovery. Large UDP packets may fail to be delivered when sent from this socket.\n");
#endif /* HAVE_IP_MTU_DISCOVER */