| /* Find the correct compiler. |
| Copyright (C) 2014-2021 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| #include <string> |
| #include <dirent.h> |
| #include <stdlib.h> |
| |
| #include "libiberty.h" |
| #include "xregex.h" |
| #include "findcomp.hh" |
| #include "system.h" |
| |
| class scanner |
| { |
| public: |
| |
| scanner (const std::string &dir) |
| { |
| m_dir = opendir (dir.c_str ()); |
| } |
| |
| ~scanner () |
| { |
| if (m_dir != NULL) |
| closedir (m_dir); |
| } |
| |
| const char *next () |
| { |
| if (m_dir == NULL) |
| return NULL; |
| |
| struct dirent *entry = readdir (m_dir); |
| if (entry == NULL) |
| return NULL; |
| |
| return entry->d_name; |
| } |
| |
| private: |
| |
| DIR *m_dir; |
| }; |
| |
| static bool |
| search_dir (const regex_t ®exp, const std::string &dir, std::string *result) |
| { |
| scanner scan (dir); |
| const char *filename; |
| |
| while ((filename = scan.next ()) != NULL) |
| { |
| if (regexec (®exp, filename, 0, NULL, 0) == 0) |
| { |
| *result = dir + DIR_SEPARATOR + filename; |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| class tokenizer |
| { |
| public: |
| |
| tokenizer (const char *str) |
| : m_str (str), |
| m_pos (0) |
| { |
| } |
| |
| bool done () const |
| { |
| return m_pos == std::string::npos; |
| } |
| |
| std::string next () |
| { |
| std::string::size_type last_pos = m_pos; |
| std::string::size_type colon = m_str.find(':', last_pos); |
| |
| std::string result; |
| if (colon == std::string::npos) |
| { |
| m_pos = colon; |
| result = m_str.substr(last_pos, colon); |
| } |
| else |
| { |
| m_pos = colon + 1; |
| result = m_str.substr(last_pos, colon - last_pos); |
| } |
| if (result == "") |
| result = "."; |
| |
| return result; |
| } |
| |
| private: |
| |
| std::string m_str; |
| std::string::size_type m_pos; |
| }; |
| |
| bool |
| find_compiler (const regex_t ®exp, std::string *result) |
| { |
| const char *cpath = getenv ("PATH"); |
| |
| if (cpath == NULL) |
| return false; |
| |
| tokenizer dirs (cpath); |
| while (!dirs.done ()) |
| { |
| std::string dir = dirs.next (); |
| if (search_dir (regexp, dir, result)) |
| return true; |
| } |
| |
| return false; |
| } |