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
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <tb/sb.h>
#include <tb/sv.h>
#include <unistd.h>
char *realpath(const char *filename, char *resolvedname) {
if (!filename) {
return -EINVAL;
}
char cwd[256];
getcwd(cwd, 256);
strcat(cwd, filename); // FIXME: bounds check
struct sb string;
sb_init_capacity(&string, 256);
struct sv path = C_TO_SV(cwd);
int ignore = 0;
int last_was_dotdot = 0;
int was_root = 0;
for (;;) {
ignore = 0;
was_root = 0;
struct sv dir = sv_end_split_delim(path, &path, '/');
if (sv_partial_eq(dir, C_TO_SV("/"))) {
was_root = 1;
}
if (sv_eq(dir, C_TO_SV("/"))) {
ignore = 1;
}
if (sv_eq(dir, C_TO_SV("/."))) {
ignore = 1;
}
if (sv_eq(dir, C_TO_SV("/.."))) {
last_was_dotdot = 1;
ignore = 1;
} else {
if (last_was_dotdot) {
ignore = 1;
}
last_was_dotdot = 0;
}
if (!ignore && !last_was_dotdot) {
sb_prepend_sv(&string, dir);
}
if (sv_isempty(path)) {
if (was_root && ignore && sb_isempty(&string)) {
sb_prepend_sv(&string, C_TO_SV("/"));
}
break;
}
}
char *result = sv_copy_to_c(SB_TO_SV(string), resolvedname, 256);
sb_free(&string);
return result;
}
|
