File: read9pmsg.c

package info (click to toggle)
drawterm 20170818-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, buster, forky, sid, trixie
  • size: 3,124 kB
  • ctags: 5,803
  • sloc: ansic: 55,900; python: 2,501; makefile: 570; asm: 20
file content (31 lines) | stat: -rw-r--r-- 462 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
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;
}