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/* ISC license. */
#include <sys/types.h>
#include <errno.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/iobuffer.h>
#include <skalibs/djbunix.h>
size_t fd_catn (int from, int to, size_t n)
{
size_t w = 0 ;
if (n >= IOBUFFER_SIZE)
{
iobuffer b ;
if (!iobuffer_init(&b, from, to)) return 0 ;
while (n >= IOBUFFER_SIZE)
{
ssize_t r = iobuffer_fill(&b) ;
if (r <= 0)
{
iobuffer_finish(&b) ;
if (!r) errno = EPIPE ;
return w ;
}
if (!iobuffer_flush(&b))
{
iobuffer_finish(&b) ;
return w ;
}
n -= r ; w += r ;
}
iobuffer_finish(&b) ;
}
{
char buf[n] ;
size_t r = allread(from, buf, n) ;
size_t v = 0 ;
if (r) v = allwrite(to, buf, r) ;
w += v ;
}
return w ;
}
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