32 lines
462 B
C
32 lines
462 B
C
#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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int
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read9pmsg(int fd, void *abuf, uint n)
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{
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int m, len;
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uchar *buf;
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buf = abuf;
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/* read count */
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m = readn(fd, buf, BIT32SZ);
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if(m != BIT32SZ){
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if(m < 0)
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return -1;
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return 0;
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}
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len = GBIT32(buf);
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if(len <= BIT32SZ || len > n){
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werrstr("bad length in 9P2000 message header");
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return -1;
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}
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len -= BIT32SZ;
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m = readn(fd, buf+BIT32SZ, len);
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if(m < len)
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return 0;
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return BIT32SZ+m;
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}
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