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author | rsc <devnull@localhost> | 2003-12-06 18:08:52 +0000 |
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committer | rsc <devnull@localhost> | 2003-12-06 18:08:52 +0000 |
commit | d3df308747ee4d1fcc063a348dcf1146b390bda7 (patch) | |
tree | a204b027256ec29b110caaa86100cbd701808b5b /src/lib9/read9pmsg.c | |
parent | e97ceade5e1bba5787e39429384336fa37797906 (diff) | |
download | plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.tar.gz plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.tar.bz2 plan9port-d3df308747ee4d1fcc063a348dcf1146b390bda7.zip |
File system stuff.
Diffstat (limited to 'src/lib9/read9pmsg.c')
-rw-r--r-- | src/lib9/read9pmsg.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/lib9/read9pmsg.c b/src/lib9/read9pmsg.c new file mode 100644 index 00000000..9e90ec5d --- /dev/null +++ b/src/lib9/read9pmsg.c @@ -0,0 +1,31 @@ +#include <u.h> +#include <libc.h> +#include <fcall.h> + +int +read9pmsg(int fd, void *abuf, uint n) +{ + int m, len; + uchar *buf; + + buf = abuf; + + /* read count */ + m = readn(fd, buf, BIT32SZ); + if(m != BIT32SZ){ + if(m < 0) + return -1; + return 0; + } + + len = GBIT32(buf); + if(len <= BIT32SZ || len > n){ + werrstr("bad length in 9P2000 message header"); + return -1; + } + len -= BIT32SZ; + m = readn(fd, buf+BIT32SZ, len); + if(m < len) + return 0; + return BIT32SZ+m; +} |