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read9pmsg.c - 9base - revived minimalist port of Plan 9 userland to Unix |
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git clone git://git.suckless.org/9base |
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read9pmsg.c (462B) |
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1 #include <u.h> |
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2 #include <libc.h> |
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3 #include <fcall.h> |
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4 |
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5 int |
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6 read9pmsg(int fd, void *abuf, uint n) |
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7 { |
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8 int m, len; |
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9 uchar *buf; |
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10 |
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11 buf = abuf; |
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12 |
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13 /* read count */ |
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14 m = readn(fd, buf, BIT32SZ); |
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15 if(m != BIT32SZ){ |
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16 if(m < 0) |
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17 return -1; |
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18 return 0; |
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19 } |
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20 |
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21 len = GBIT32(buf); |
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22 if(len <= BIT32SZ || len > n){ |
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23 werrstr("bad length in 9P2000 message header"); |
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24 return -1; |
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25 } |
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26 len -= BIT32SZ; |
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27 m = readn(fd, buf+BIT32SZ, len); |
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28 if(m < len) |
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29 return 0; |
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30 return BIT32SZ+m; |
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31 } |
