1 /* Find the correct compiler. 2 Copyright (C) 2014 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 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 } 140