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