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ab103e33 | 1 | /* Find the correct compiler. |
6f8b1fff | 2 | Copyright (C) 2014-2016 Free Software Foundation, Inc. |
ab103e33 | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <config.h> | |
21 | #include <string> | |
22 | #include <dirent.h> | |
23 | #include <stdlib.h> | |
24 | ||
25 | #include "libiberty.h" | |
26 | #include "xregex.h" | |
27 | #include "findcomp.hh" | |
28 | ||
29 | class scanner | |
30 | { | |
31 | public: | |
32 | ||
33 | scanner (const std::string &dir) | |
34 | { | |
35 | m_dir = opendir (dir.c_str ()); | |
36 | } | |
37 | ||
38 | ~scanner () | |
39 | { | |
40 | if (m_dir != NULL) | |
41 | closedir (m_dir); | |
42 | } | |
43 | ||
44 | const char *next () | |
45 | { | |
46 | if (m_dir == NULL) | |
47 | return NULL; | |
48 | ||
49 | struct dirent *entry = readdir (m_dir); | |
50 | if (entry == NULL) | |
51 | return NULL; | |
52 | ||
53 | return entry->d_name; | |
54 | } | |
55 | ||
56 | private: | |
57 | ||
58 | DIR *m_dir; | |
59 | }; | |
60 | ||
61 | static bool | |
62 | search_dir (const regex_t ®exp, const std::string &dir, std::string *result) | |
63 | { | |
64 | scanner scan (dir); | |
65 | const char *filename; | |
66 | ||
67 | while ((filename = scan.next ()) != NULL) | |
68 | { | |
69 | if (regexec (®exp, filename, 0, NULL, 0) == 0) | |
70 | { | |
71 | *result = filename; | |
72 | return true; | |
73 | } | |
74 | } | |
75 | ||
76 | return false; | |
77 | } | |
78 | ||
79 | class tokenizer | |
80 | { | |
81 | public: | |
82 | ||
83 | tokenizer (const char *str) | |
84 | : m_str (str), | |
85 | m_pos (0) | |
86 | { | |
87 | } | |
88 | ||
89 | bool done () const | |
90 | { | |
91 | return m_pos == std::string::npos; | |
92 | } | |
93 | ||
94 | std::string next () | |
95 | { | |
96 | std::string::size_type last_pos = m_pos; | |
97 | std::string::size_type colon = m_str.find(':', last_pos); | |
98 | ||
99 | std::string result; | |
100 | if (colon == std::string::npos) | |
101 | { | |
102 | m_pos = colon; | |
103 | result = m_str.substr(last_pos, colon); | |
104 | } | |
105 | else | |
106 | { | |
107 | m_pos = colon + 1; | |
108 | result = m_str.substr(last_pos, colon - last_pos); | |
109 | } | |
110 | if (result == "") | |
111 | result = "."; | |
112 | ||
113 | return result; | |
114 | } | |
115 | ||
116 | private: | |
117 | ||
118 | std::string m_str; | |
119 | std::string::size_type m_pos; | |
120 | }; | |
121 | ||
122 | bool | |
123 | find_compiler (const regex_t ®exp, std::string *result) | |
124 | { | |
125 | const char *cpath = getenv ("PATH"); | |
126 | ||
127 | if (cpath == NULL) | |
128 | return false; | |
129 | ||
130 | tokenizer dirs (cpath); | |
131 | while (!dirs.done ()) | |
132 | { | |
133 | std::string dir = dirs.next (); | |
134 | if (search_dir (regexp, dir, result)) | |
135 | return true; | |
136 | } | |
137 | ||
138 | return false; | |
139 | } |