1 #include <plan9.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 buf += STATFIXLEN - 4 * BIT16SZ;
13
14 for(i = 0; i < 4; i++){
15 if(buf + BIT16SZ > ebuf)
16 return -1;
17 buf += BIT16SZ + GBIT16(buf);
18 }
19
20 if(buf != ebuf)
21 return -1;
22
23 return 0;
24 }
25
26 static char nullstring[] = "";
27
28 uint
convM2D(uchar * buf,uint nbuf,Dir * d,char * strs)29 convM2D(uchar *buf, uint nbuf, Dir *d, char *strs)
30 {
31 uchar *p, *ebuf;
32 char *sv[4];
33 int i, ns;
34
35 p = buf;
36 ebuf = buf + nbuf;
37
38 p += BIT16SZ; /* ignore size */
39 d->type = GBIT16(p);
40 p += BIT16SZ;
41 d->dev = GBIT32(p);
42 p += BIT32SZ;
43 d->qid.type = GBIT8(p);
44 p += BIT8SZ;
45 d->qid.vers = GBIT32(p);
46 p += BIT32SZ;
47 d->qid.path = GBIT64(p);
48 p += BIT64SZ;
49 d->mode = GBIT32(p);
50 p += BIT32SZ;
51 d->atime = GBIT32(p);
52 p += BIT32SZ;
53 d->mtime = GBIT32(p);
54 p += BIT32SZ;
55 d->length = GBIT64(p);
56 p += BIT64SZ;
57
58 d->name = nil;
59 d->uid = nil;
60 d->gid = nil;
61 d->muid = nil;
62
63 for(i = 0; i < 4; i++){
64 if(p + BIT16SZ > ebuf)
65 return 0;
66 ns = GBIT16(p);
67 p += BIT16SZ;
68 if(p + ns > ebuf)
69 return 0;
70 if(strs){
71 sv[i] = strs;
72 memmove(strs, p, ns);
73 strs += ns;
74 *strs++ = '\0';
75 }
76 p += ns;
77 }
78
79 if(strs){
80 d->name = sv[0];
81 d->uid = sv[1];
82 d->gid = sv[2];
83 d->muid = sv[3];
84 }else{
85 d->name = nullstring;
86 d->uid = nullstring;
87 d->gid = nullstring;
88 d->muid = nullstring;
89 }
90
91 return p - buf;
92 }
93