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#include "io.h"
char buf[65536];
int64 readpos = 0;
int64 writepos = 0;
int flageof = 0;
int main()
{
int64 r;
if (!io_fd(0)) return 111;
if (!io_fd(1)) return 111;
for (;;) {
if (flageof && writepos >= readpos) return 0;
if (!flageof && readpos < sizeof buf) {
r = io_tryread(0,buf + readpos,sizeof buf - readpos);
if (r <= -2) return 111; /* read error other than EAGAIN */
if (r == 0) flageof = 1;
if (r > 0) readpos += r;
}
if (writepos < readpos) {
r = io_trywrite(1,buf + writepos,readpos - writepos);
if (r <= -2) return 111; /* write error other than EAGAIN */
if (r > 0) {
writepos += r;
if (writepos == readpos) readpos = writepos = 0;
/* if writepos is big, might want to left-shift buffer here */
}
}
}
}
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