| 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 #include "UtilityFunctions.hh"
27
28 #include <cstdio>
29 #include <memory>
30
31 #ifdef WIN32
32 # include <direct.h>
33 #else
34 # include <unistd.h>
35 #endif
36
37 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
38
39 namespace utility
40 {
41 std::vector<G4String>& Split(const G4String& str, char delim, std::vector<G4String>& elems)
42 {
43 std::stringstream ss(str);
44 std::string item;
45 while (std::getline(ss, item, delim)) {
46 if (!item.empty()) elems.push_back((G4String)item);
47 }
48 return elems;
49 }
50
51 std::vector<G4String> Split(const G4String& str, char delim)
52 {
53 std::vector<G4String> elems;
54 Split(str, delim, elems);
55 return elems;
56 }
57
58 // return element ii
59 G4String Get_seperated_element(const G4String& str, char delim, G4int ii)
60 {
61 G4int delims = 0;
62 G4String ss;
63 for (char c : str) {
64 if (delims > ii) {
65 return ss;
66 }
67 if (c == delim) {
68 delims++;
69 }
70 else if (delims == ii) {
71 ss += c;
72 }
73 }
74 return ss;
75 }
76
77 // return first four strings
78 std::array<G4String, 4> Get_four_elements(const G4String& str, char delim)
79 {
80 G4int delims = 0;
81 std::array<G4String, 4> arr;
82 for (char c : str) {
83 if (delims >= 4) return arr;
84 if (c == delim)
85 delims++;
86 else
87 arr.at(delims) += c;
88 }
89 return arr;
90 }
91
92 G4bool Path_exists(const G4String& fname)
93 {
94 G4bool bool_val = false;
95 if (FILE* file = std::fopen(fname, "r")) {
96 fclose(file);
97 bool_val = true;
98 }
99 return bool_val;
100 }
101
102 // Memory safe multi-platform getcwd
103 // http://stackoverflow.com/questions/2869594/
104 G4String Getcwd()
105 {
106 const size_t chunkSize = 255;
107 const int maxChunks = 10240; // 2550 KiBs of current path is plenty
108
109 char stackBuffer[chunkSize]; // Stack buffer for the "normal" case
110 if (::getcwd(stackBuffer, sizeof(stackBuffer)) != nullptr) return stackBuffer;
111 if (errno != ERANGE) {
112 // It's not ERANGE, so we don't know how to handle it
113 throw std::runtime_error("Cannot determine the current path.");
114 // Of course you may choose a different error reporting method
115 }
116 // Ok, the stack buffer isn't long enough; fallback to heap allocation
117 for (int chunks = 2; chunks < maxChunks; chunks++) {
118 // With boost use scoped_ptr; in C++0x, use unique_ptr
119 // If you want to be less C++ but more efficient
120 // you may want to use realloc
121 std::unique_ptr<char[]> cwd(new char[chunkSize * chunks]);
122 if (::getcwd(cwd.get(), chunkSize * chunks) != nullptr) return cwd.get();
123 if (errno != ERANGE) {
124 // It's not ERANGE, so we don't know how to handle it
125 throw std::runtime_error("Cannot determine the current path.");
126 // Of course you may choose a different error reporting method
127 }
128 }
129 throw std::runtime_error(
130 "Cannot determine the current path; the path is "
131 "apparently unreasonably long");
132 }
133
134 G4double Min(const G4ThreeVector& v)
135 {
136 return std::min(std::min(v.x(), v.y()), v.z());
137 }
138 } // namespace utility
139
140 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
141