1 /* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
2
3 #include "inc.h"
4
5 #include <limits.h>
6
7 /*===========================================================================*
8 * path_put *
9 *===========================================================================*/
path_put(const char * path)10 void path_put(const char *path)
11 {
12 /* Append the given path name in HGFS format to the RPC buffer. Truncate it
13 * if it is longer than PATH_MAX bytes.
14 */
15 const char *p;
16 char buf[PATH_MAX];
17 unsigned int len;
18
19 /* No leading slashes are allowed. */
20 for (p = path; *p == '/'; p++);
21
22 /* No double or tailing slashes, either. */
23 for (len = 0; *p && len < sizeof(buf) - 1; len++) {
24 if (*p == '/') {
25 for (p++; *p == '/'; p++);
26
27 if (!*p) break;
28
29 buf[len] = 0;
30 }
31 else buf[len] = *p++;
32 }
33
34 RPC_NEXT32 = len;
35
36 memcpy(RPC_PTR, buf, len);
37 RPC_ADVANCE(len);
38
39 RPC_NEXT8 = 0;
40 }
41
42 /*===========================================================================*
43 * path_get *
44 *===========================================================================*/
path_get(char * path,int max)45 int path_get(char *path, int max)
46 {
47 /* Retrieve a HGFS formatted path name from the RPC buffer. Returns EINVAL if
48 * the path name is invalid. Returns ENAMETOOLONG if the path name is too
49 * long. Returns OK on success.
50 */
51 char *p, *q;
52 int n, len;
53
54 n = len = RPC_NEXT32;
55
56 if (len >= max) return ENAMETOOLONG;
57
58 for (p = path, q = RPC_PTR; n--; p++, q++) {
59 /* We can not deal with a slash in a path component. */
60 if (*q == '/') return EINVAL;
61
62 if (*q == 0) *p = '/';
63 else *p = *q;
64 }
65
66 RPC_ADVANCE(len);
67
68 *p = 0;
69
70 return (RPC_NEXT8 != 0) ? EINVAL : OK;
71 }
72