| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26
27 #include <mutex>
28
29 #ifndef G4GMAKE
30 #include "G4FindDataDir.hh"
31 #include "G4Filesystem.hh"
32 #include "G4Exception.hh"
33
34 #include <cstdio>
35 #include <cstdlib>
36 #include <cstring>
37
38 #if defined(_WIN32)
39 #define setenv(name, value, overwrite) _putenv_s(name, value)
40 #endif
41
42 using namespace G4fs;
43
44 static const char * const system_paths[] = {
45 GEANT4_INSTALL_FULL_DATADIR,
46 CMAKE_INSTALL_PREFIX,
47 #if defined(_MSC_VER)
48 "C:\\Program Files",
49 "C:\\Geant4"
50 #else
51 "/usr/local",
52 "/usr",
53 "/cvmfs/geant4.cern.ch"
54 #endif
55 };
56
57 static const char * const data_paths[] = {
58 ".",
59 GEANT4_INSTALL_DATADIR,
60 CMAKE_INSTALL_DATADIR,
61 "share/Geant4/data",
62 "share/geant4/data",
63 "share/data",
64 "data"
65 };
66
67 static const char* G4GetDataDir(const char* name)
68 {
69 for (const auto& d : dataset_definitions)
70 if (strcmp(name, d.env) == 0)
71 return d.dir;
72
73 return nullptr;
74 }
75
76 static const char* G4FindDataDir(const char* name, const path& prefix, const path& dataset)
77 {
78 if (!is_directory(prefix))
79 return nullptr;
80
81 for (const auto data_path : data_paths) {
82 path datadir = prefix;
83 if (strcmp(data_path,".") == 0)
84 datadir /= dataset;
85 else
86 datadir /= path(data_path) / dataset;
87 if (is_directory(absolute(datadir)))
88 return setenv(name, absolute(datadir).string().c_str(), 0) == 0 ? std::getenv(name) : nullptr;
89 }
90
91 return nullptr;
92 }
93
94 const char* G4FindDataDir(const char* name)
95 {
96 #if defined(G4MULTITHREADED)
97 static std::mutex mutex;
98 std::lock_guard<std::mutex> lock(mutex);
99 #endif
100
101 /* If environment variable is set for this dataset, use it */
102 if (const char *datadir = std::getenv(name))
103 return datadir;
104
105 /* If we know which directory/version to search for, try to find it */
106 if (const char *dataset = G4GetDataDir(name)) {
107 /* If GEANT4_DATA_DIR environment variable is set, use it and don't search further */
108 if (const char *basedir = std::getenv("GEANT4_DATA_DIR")) {
109 if (is_directory(basedir)) return G4FindDataDir(name, basedir, dataset);
110
111 G4Exception("G4FindDataDir", "Invalid GEANT4_DATA_DIR", JustWarning, "The GEANT4_DATA_DIR environment variable points to an invalid directory.\n"
112 "Will try fallback locations now. Correct the variable to disable this behaviour.");
113 }
114
115 /* If GEANT4_DATA_DIR environment variable is not set, search in default system paths */
116 for (const auto prefix : system_paths)
117 if (const auto datadir = G4FindDataDir(name, prefix, dataset))
118 return datadir;
119 }
120
121 return nullptr;
122 }
123
124 #else
125 // Support GNUmake builds
126 #include <cstdlib>
127
128 const char* G4FindDataDir(const char* name)
129 {
130 #if defined(G4MULTITHREADED)
131 static std::mutex mutex;
132 std::lock_guard<std::mutex> lock(mutex);
133 #endif
134 /* If environment variable is set for this dataset, use it */
135 if (const char *datadir = std::getenv(name))
136 return datadir;
137
138 return nullptr;
139 }
140 #endif
141