32 lines
462 B
C
32 lines
462 B
C
|
#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;
|
||
|
|
}
|