src/path.cc


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


#include "path.h"

namespace ov4
{

using namespace std;

string current_dir;

string find_cmd(char* s)
{
    string tmp = s;
    return find_cmd(tmp);
}

string find_cmd(string s)
{
    if (s.size() == 0) return "";
    string unified_s = path_unifier(s);
    cout << unified_s << endl;
    if (access(unified_s.c_str(), F_OK) == 0)
            return unified_s;

    string path = getenv("PATH");
    size_t i = 0, j = 0, l = path.size();
    while (true)
    {
        for (; j < l; j++)
            if (path[j] == ':')
                break;
        
        string cmd = path.substr(i, j-i) + '/' +s;
        if (access(cmd.c_str(), F_OK) == 0)
            return cmd;

        if (j == l)
            return "/";

        j++;
        i=j;

    }
}

string path_unifier(const string &s)
{
    if (s.size() == 0) return "";
    if (s[0] == '/') return s;
    if (s[0] == '.')
    {
        return current_dir + s.substr(1);
    }
}

string set_current_dir(string s)
{
    return current_dir = s;
}


}