/// Reads at most \p n bytes into \p p, stopping when it feels like it.
off_t fstream::readsome (void* p, off_t n)
{
ssize_t brn;
do { brn = ::read (m_fd, p, n); } while ((brn < 0) & (errno == EINTR));
if (brn > 0)
return (brn);
else if ((brn < 0) & (errno != EAGAIN))
set_and_throw (failbit, "read");
else if (!brn && ios_base::set_and_throw (eofbit | failbit))
throw stream_bounds_exception ("read", name(), pos(), n, 0);
return (0);
}
/// Reads at most \p n bytes into \p p, stopping when it feels like it.
off_t fstream::readsome (void* p, off_t n)
{
ssize_t brn;
do { brn = ::read (m_fd, p, n); } while (brn < 0 && errno == EINTR);
if (brn > 0)
return (brn);
if (brn < 0 && errno != EAGAIN)
set_and_throw (failbit, "read");
if (!brn && ios_base::set_and_throw (eofbit | failbit))
#if PLATFORM_ANDROID
printf("stream_bounds_exception\n");
#else /* !PLATFORM_ANDROID */
throw stream_bounds_exception ("read", name(), pos(), n, 0);
#endif
return (0);
}
/// Writes \p n bytes from \p p.
off_t fstream::write (const void* p, off_t n)
{
off_t btw (n);
while (btw) {
const off_t bw (n - btw);
ssize_t bwn = ::write (m_fd, advance(p,bw), btw);
if (bwn > 0)
btw -= bwn;
else if (!bwn) {
if (ios_base::set_and_throw (eofbit | failbit))
throw stream_bounds_exception ("write", name(), pos() - bw, n, bw);
break;
} else if (errno != EINTR) {
if (errno != EAGAIN)
set_and_throw (failbit, "write");
break;
}
}
return (n - btw);
}
/// Checks that \p n bytes are available in the stream, or else throws.
void ios_base::overrun (const char* op, const char* type, uint32_t n, uint32_t pos, uint32_t rem)
{
if (set_and_throw (rem ? failbit : (failbit | eofbit)))
USTL_THROW(stream_bounds_exception (op, type, pos, n, rem));
}
