1 #include	<u.h>
2 #include	<libc.h>
3 #include	<fcall.h>
4 
5 uint
6 sizeD2M(Dir *d)
7 {
8 	char *sv[4];
9 	int i, ns;
10 
11 	sv[0] = d->name;
12 	sv[1] = d->uid;
13 	sv[2] = d->gid;
14 	sv[3] = d->muid;
15 
16 	ns = 0;
17 	for(i = 0; i < 4; i++)
18 		if(sv[i])
19 			ns += strlen(sv[i]);
20 
21 	return STATFIXLEN + ns;
22 }
23 
24 uint
25 convD2M(Dir *d, uchar *buf, uint nbuf)
26 {
27 	uchar *p, *ebuf;
28 	char *sv[4];
29 	int i, ns, nsv[4], ss;
30 
31 	if(nbuf < BIT16SZ)
32 		return 0;
33 
34 	p = buf;
35 	ebuf = buf + nbuf;
36 
37 	sv[0] = d->name;
38 	sv[1] = d->uid;
39 	sv[2] = d->gid;
40 	sv[3] = d->muid;
41 
42 	ns = 0;
43 	for(i = 0; i < 4; i++){
44 		if(sv[i])
45 			nsv[i] = strlen(sv[i]);
46 		else
47 			nsv[i] = 0;
48 		ns += nsv[i];
49 	}
50 
51 	ss = STATFIXLEN + ns;
52 
53 	/* set size befor erroring, so user can know how much is needed */
54 	/* note that length excludes count field itself */
55 	PBIT16(p, ss-BIT16SZ);
56 	p += BIT16SZ;
57 
58 	if(ss > nbuf)
59 		return BIT16SZ;
60 
61 	PBIT16(p, d->type);
62 	p += BIT16SZ;
63 	PBIT32(p, d->dev);
64 	p += BIT32SZ;
65 	PBIT8(p, d->qid.type);
66 	p += BIT8SZ;
67 	PBIT32(p, d->qid.vers);
68 	p += BIT32SZ;
69 	PBIT64(p, d->qid.path);
70 	p += BIT64SZ;
71 	PBIT32(p, d->mode);
72 	p += BIT32SZ;
73 	PBIT32(p, d->atime);
74 	p += BIT32SZ;
75 	PBIT32(p, d->mtime);
76 	p += BIT32SZ;
77 	PBIT64(p, d->length);
78 	p += BIT64SZ;
79 
80 	for(i = 0; i < 4; i++){
81 		ns = nsv[i];
82 		if(p + ns + BIT16SZ > ebuf)
83 			return 0;
84 		PBIT16(p, ns);
85 		p += BIT16SZ;
86 		if(ns)
87 			memmove(p, sv[i], ns);
88 		p += ns;
89 	}
90 
91 	if(ss != p - buf)
92 		return 0;
93 
94 	return p - buf;
95 }