1 #include "lib9.h"
2 #include "fcall.h"
3
4 int
statcheck(uchar * buf,uint nbuf)5 statcheck(uchar *buf, uint nbuf)
6 {
7 uchar *ebuf;
8 int i;
9
10 ebuf = buf + nbuf;
11
12 if(nbuf < STATFIXLEN || nbuf != BIT16SZ + GBIT16(buf))
13 return -1;
14
15 buf += STATFIXLEN - 4 * BIT16SZ;
16
17 for(i = 0; i < 4; i++){
18 if(buf + BIT16SZ > ebuf)
19 return -1;
20 buf += BIT16SZ + GBIT16(buf);
21 }
22
23 if(buf != ebuf)
24 return -1;
25
26 return 0;
27 }
28
29 static char nullstring[] = "";
30
31 uint
convM2D(uchar * buf,uint nbuf,Dir * d,char * strs)32 convM2D(uchar *buf, uint nbuf, Dir *d, char *strs)
33 {
34 uchar *p, *ebuf;
35 char *sv[4];
36 int i, ns;
37
38 if(nbuf < STATFIXLEN)
39 return 0;
40
41 p = buf;
42 ebuf = buf + nbuf;
43
44 p += BIT16SZ; /* ignore size */
45 d->type = GBIT16(p);
46 p += BIT16SZ;
47 d->dev = GBIT32(p);
48 p += BIT32SZ;
49 d->qid.type = GBIT8(p);
50 p += BIT8SZ;
51 d->qid.vers = GBIT32(p);
52 p += BIT32SZ;
53 d->qid.path = GBIT64(p);
54 p += BIT64SZ;
55 d->mode = GBIT32(p);
56 p += BIT32SZ;
57 d->atime = GBIT32(p);
58 p += BIT32SZ;
59 d->mtime = GBIT32(p);
60 p += BIT32SZ;
61 d->length = GBIT64(p);
62 p += BIT64SZ;
63
64 for(i = 0; i < 4; i++){
65 if(p + BIT16SZ > ebuf)
66 return 0;
67 ns = GBIT16(p);
68 p += BIT16SZ;
69 if(p + ns > ebuf)
70 return 0;
71 if(strs){
72 sv[i] = strs;
73 memmove(strs, p, ns);
74 strs += ns;
75 *strs++ = '\0';
76 }
77 p += ns;
78 }
79
80 if(strs){
81 d->name = sv[0];
82 d->uid = sv[1];
83 d->gid = sv[2];
84 d->muid = sv[3];
85 }else{
86 d->name = nullstring;
87 d->uid = nullstring;
88 d->gid = nullstring;
89 d->muid = nullstring;
90 }
91
92 return p - buf;
93 }
94