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41 lines
1.0 KiB
41 lines
1.0 KiB
#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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