skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
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textmessage_receiver_hasmsginbuf.c (488B)

      1 /* ISC license. */
      2 
      3 #include <stdint.h>
      4 #include <sys/uio.h>
      5 #include <skalibs/uint32.h>
      6 #include <skalibs/siovec.h>
      7 #include <skalibs/buffer.h>
      8 #include <skalibs/textmessage.h>
      9 
     10 int textmessage_receiver_hasmsginbuf (textmessage_receiver const *tr)
     11 {
     12   size_t len = buffer_len(&tr->in) ;
     13   uint32_t n ;
     14   char pack[4] ;
     15   struct iovec v[2] ;
     16   if (len < 4) return 0 ;
     17   buffer_rpeek(&tr->in, v) ;
     18   siovec_gather(v, 2, pack, 4) ;
     19   uint32_unpack_big(pack, &n) ;
     20   return len - 4 >= n ;
     21 }