skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
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siovec_seek.c (496B)

      1 /* ISC license. */
      2 
      3 #include <sys/uio.h>
      4 #include <skalibs/bytestr.h>
      5 #include <skalibs/siovec.h>
      6 
      7 size_t siovec_seek (struct iovec *v, unsigned int n, size_t len)
      8 {
      9   size_t w = 0 ;
     10   unsigned int i = 0 ;
     11   for (; i < n ; i++)
     12   {
     13     if (len < v[i].iov_len) break ;
     14     w += v[i].iov_len ;
     15     len -= v[i].iov_len ;
     16     v[i].iov_base = 0 ;
     17     v[i].iov_len = 0 ;
     18   }
     19   if (i < n)
     20   {
     21     v[i].iov_base = (char *)v[i].iov_base + len ;
     22     v[i].iov_len -= len ;
     23     w += len ;
     24   }
     25   return w ;
     26 }