1 files changed, 21 insertions, 0 deletions
diff --git a/src/libunixonacid/textmessage_receiver_hasmsginbuf.c b/src/libunixonacid/textmessage_receiver_hasmsginbuf.c
new file mode 100644
index 0000000..d0cdcc3
--- /dev/null
+++ b/src/libunixonacid/textmessage_receiver_hasmsginbuf.c
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <sys/uio.h>
+#include <skalibs/uint32.h>
+#include <skalibs/siovec.h>
+#include <skalibs/buffer.h>
+#include <skalibs/textmessage.h>
+
+int textmessage_receiver_hasmsginbuf (textmessage_receiver_t const *tr)
+{
+  size_t len = buffer_len(&tr->in) ;
+  uint32_t n ;
+  char pack[4] ;
+  struct iovec v[2] ;
+  if (len < 4) return 0 ;
+  buffer_rpeek(&tr->in, v) ;
+  siovec_gather(v, 2, pack, 4) ;
+  uint32_unpack_big(pack, &n) ;
+  return len - 4 >= n ;
+}