]>
Commit | Line | Data |
---|---|---|
1 | /* Find the correct compiler. | |
2 | Copyright (C) 2014-2021 Free Software Foundation, Inc. | |
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 | #include "system.h" | |
29 | ||
30 | class scanner | |
31 | { | |
32 | public: | |
33 | ||
34 | scanner (const std::string &dir) | |
35 | { | |
36 | m_dir = opendir (dir.c_str ()); | |
37 | } | |
38 | ||
39 | ~scanner () | |
40 | { | |
41 | if (m_dir != NULL) | |
42 | closedir (m_dir); | |
43 | } | |
44 | ||
45 | const char *next () | |
46 | { | |
47 | if (m_dir == NULL) | |
48 | return NULL; | |
49 | ||
50 | struct dirent *entry = readdir (m_dir); | |
51 | if (entry == NULL) | |
52 | return NULL; | |
53 | ||
54 | return entry->d_name; | |
55 | } | |
56 | ||
57 | private: | |
58 | ||
59 | DIR *m_dir; | |
60 | }; | |
61 | ||
62 | static bool | |
63 | search_dir (const regex_t ®exp, const std::string &dir, std::string *result) | |
64 | { | |
65 | scanner scan (dir); | |
66 | const char *filename; | |
67 | ||
68 | while ((filename = scan.next ()) != NULL) | |
69 | { | |
70 | if (regexec (®exp, filename, 0, NULL, 0) == 0) | |
71 | { | |
72 | *result = dir + DIR_SEPARATOR + filename; | |
73 | return true; | |
74 | } | |
75 | } | |
76 | ||
77 | return false; | |
78 | } | |
79 | ||
80 | class tokenizer | |
81 | { | |
82 | public: | |
83 | ||
84 | tokenizer (const char *str) | |
85 | : m_str (str), | |
86 | m_pos (0) | |
87 | { | |
88 | } | |
89 | ||
90 | bool done () const | |
91 | { | |
92 | return m_pos == std::string::npos; | |
93 | } | |
94 | ||
95 | std::string next () | |
96 | { | |
97 | std::string::size_type last_pos = m_pos; | |
98 | std::string::size_type colon = m_str.find(':', last_pos); | |
99 | ||
100 | std::string result; | |
101 | if (colon == std::string::npos) | |
102 | { | |
103 | m_pos = colon; | |
104 | result = m_str.substr(last_pos, colon); | |
105 | } | |
106 | else | |
107 | { | |
108 | m_pos = colon + 1; | |
109 | result = m_str.substr(last_pos, colon - last_pos); | |
110 | } | |
111 | if (result == "") | |
112 | result = "."; | |
113 | ||
114 | return result; | |
115 | } | |
116 | ||
117 | private: | |
118 | ||
119 | std::string m_str; | |
120 | std::string::size_type m_pos; | |
121 | }; | |
122 | ||
123 | bool | |
124 | find_compiler (const regex_t ®exp, std::string *result) | |
125 | { | |
126 | const char *cpath = getenv ("PATH"); | |
127 | ||
128 | if (cpath == NULL) | |
129 | return false; | |
130 | ||
131 | tokenizer dirs (cpath); | |
132 | while (!dirs.done ()) | |
133 | { | |
134 | std::string dir = dirs.next (); | |
135 | if (search_dir (regexp, dir, result)) | |
136 | return true; | |
137 | } | |
138 | ||
139 | return false; | |
140 | } |