140 lines
2.5 KiB
C++
140 lines
2.5 KiB
C++
/* Find the correct compiler.
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Copyright (C) 2014-2016 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <string>
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#include <dirent.h>
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#include <stdlib.h>
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#include "libiberty.h"
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#include "xregex.h"
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#include "findcomp.hh"
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class scanner
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{
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public:
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scanner (const std::string &dir)
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{
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m_dir = opendir (dir.c_str ());
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}
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~scanner ()
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{
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if (m_dir != NULL)
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closedir (m_dir);
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}
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const char *next ()
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{
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if (m_dir == NULL)
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return NULL;
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struct dirent *entry = readdir (m_dir);
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if (entry == NULL)
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return NULL;
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return entry->d_name;
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}
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private:
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DIR *m_dir;
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};
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static bool
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search_dir (const regex_t ®exp, const std::string &dir, std::string *result)
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{
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scanner scan (dir);
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const char *filename;
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while ((filename = scan.next ()) != NULL)
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{
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if (regexec (®exp, filename, 0, NULL, 0) == 0)
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{
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*result = filename;
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return true;
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}
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}
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return false;
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}
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class tokenizer
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{
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public:
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tokenizer (const char *str)
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: m_str (str),
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m_pos (0)
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{
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}
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bool done () const
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{
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return m_pos == std::string::npos;
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}
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std::string next ()
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{
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std::string::size_type last_pos = m_pos;
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std::string::size_type colon = m_str.find(':', last_pos);
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std::string result;
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if (colon == std::string::npos)
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{
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m_pos = colon;
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result = m_str.substr(last_pos, colon);
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}
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else
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{
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m_pos = colon + 1;
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result = m_str.substr(last_pos, colon - last_pos);
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}
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if (result == "")
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result = ".";
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return result;
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}
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private:
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std::string m_str;
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std::string::size_type m_pos;
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};
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bool
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find_compiler (const regex_t ®exp, std::string *result)
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{
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const char *cpath = getenv ("PATH");
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if (cpath == NULL)
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return false;
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tokenizer dirs (cpath);
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while (!dirs.done ())
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{
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std::string dir = dirs.next ();
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if (search_dir (regexp, dir, result))
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return true;
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}
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return false;
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}
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