aboutsummaryrefslogtreecommitdiff
path: root/libcc1/findcomp.cc
blob: 1bbd6bf99136408fca252e05de33beed3cde3c0c (plain)
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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/* Find the correct compiler.
   Copyright (C) 2014-2018 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include <config.h>
#include <string>
#include <dirent.h>
#include <stdlib.h>

#include "libiberty.h"
#include "xregex.h"
#include "findcomp.hh"
#include "system.h"

class scanner
{
public:

  scanner (const std::string &dir)
  {
    m_dir = opendir (dir.c_str ());
  }

  ~scanner ()
  {
    if (m_dir != NULL)
      closedir (m_dir);
  }

  const char *next ()
  {
    if (m_dir == NULL)
      return NULL;

    struct dirent *entry = readdir (m_dir);
    if (entry == NULL)
      return NULL;

    return entry->d_name;
  }

private:

  DIR *m_dir;
};

static bool
search_dir (const regex_t &regexp, const std::string &dir, std::string *result)
{
  scanner scan (dir);
  const char *filename;

  while ((filename = scan.next ()) != NULL)
    {
      if (regexec (&regexp, filename, 0, NULL, 0) == 0)
	{
	  *result = dir + DIR_SEPARATOR + filename;
	  return true;
	}
    }

  return false;
}

class tokenizer
{
public:

  tokenizer (const char *str)
    : m_str (str),
      m_pos (0)
  {
  }

  bool done () const
  {
    return m_pos == std::string::npos;
  }

  std::string next ()
  {
    std::string::size_type last_pos = m_pos;
    std::string::size_type colon = m_str.find(':', last_pos);

    std::string result;
    if (colon == std::string::npos)
      {
	m_pos = colon;
	result = m_str.substr(last_pos, colon);
      }
    else
      {
	m_pos = colon + 1;
	result = m_str.substr(last_pos, colon - last_pos);
      }
    if (result == "")
      result = ".";

    return result;
  }

private:

  std::string m_str;
  std::string::size_type m_pos;
};

bool
find_compiler (const regex_t &regexp, std::string *result)
{
  const char *cpath = getenv ("PATH");

  if (cpath == NULL)
    return false;

  tokenizer dirs (cpath);
  while (!dirs.done ())
    {
      std::string dir = dirs.next ();
      if (search_dir (regexp, dir, result))
	return true;
    }

  return false;
}