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/* Find the correct compiler.
Copyright (C) 2014-2020 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;
}
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