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/*
Please use git log for copyright holder and year information
This file is part of libbash.
libbash 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 2 of the License, or
(at your option) any later version.
libbash 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 libbash. If not, see <http://www.gnu.org/licenses/>.
*/
///
/// \file bash_condition.cpp
/// \brief implementation for Bash Conditional Expressions
///
#include <ctime>
#include <boost/lexical_cast.hpp>
#include <sys/stat.h>
#include <unistd.h>
#include "core/interpreter_exception.h"
#include "core/bash_condition.h"
namespace
{
bool test_file_stat(char op, const std::string& path)
{
struct stat info;
int status = 0;
// symbol link use lstat so we need to separate this.
if(op == 'L' || op == 'h')
return lstat(path.c_str(), &info) == 0 && S_ISLNK(info.st_mode);
status = stat(path.c_str(), &info);
if(status != 0 || access(path.c_str(), F_OK))
return false;
switch(op)
{
case 'a':
case 'e':
return true;
case 'b':
return S_ISBLK(info.st_mode);
case 'c':
return S_ISCHR(info.st_mode);
case 'd':
return S_ISDIR(info.st_mode);
case 'f':
return S_ISREG(info.st_mode);
case 'g':
return S_ISGID & info.st_mode;
case 'k':
return S_ISVTX & info.st_mode;
case 'p':
return S_ISFIFO(info.st_mode);
case 'r':
return access(path.c_str(), R_OK) == 0;
case 's':
return info.st_size > 0;
case 'u':
return S_ISUID & info.st_mode;
case 'w':
return access(path.c_str(), W_OK) == 0;
case 'x':
return access(path.c_str(), X_OK) == 0;
case 'O':
return geteuid() == info.st_uid;
case 'G':
return getegid() == info.st_gid;
case 'S':
return S_ISSOCK(info.st_mode);
case 'N':
return info.st_mtime >= info.st_atime;
default:
throw interpreter_exception(std::string("Unrecognized test operator -") + op);
}
}
}
bool internal::test_unary(char op, const std::string& target)
{
switch(op)
{
case 'z':
return target.empty();
case 'n':
return !target.empty();
case 'o':
throw interpreter_exception("Shell option test is not supported");
case 't':
try
{
int fd = boost::lexical_cast<int>(target);
return isatty(fd);
}
catch(boost::bad_lexical_cast& e)
{
return false;
}
default:
return test_file_stat(op, target);
}
}
namespace
{
bool file_comp(char op,
const std::string& lhs,
const std::string& rhs)
{
struct stat lst, rst;
int lstatus, rstatus;
lstatus = stat(lhs.c_str(), &lst);
rstatus = stat(rhs.c_str(), &rst);
if(op == 'e' && (lstatus < 0 || rstatus < 0))
return false;
switch(op)
{
case 'n':
/* -nt */
return ((lstatus > rstatus) || (lstatus == 0 && lst.st_mtime > rst.st_mtime));
case 'o':
/* -ot */
return ((lstatus < rstatus) || (rstatus == 0 && lst.st_mtime < rst.st_mtime));
case 'e':
/* -ef */
return (lst.st_dev == rst.st_dev && lst.st_ino == rst.st_ino);
default:
throw interpreter_exception(std::string("Unrecognized option for file test ") + op);
}
}
}
bool internal::test_binary(const std::string& op,
const std::string& lhs,
const std::string& rhs)
{
if(op.size() != 2)
throw interpreter_exception("Unrecognized operator " + op);
try
{
if(op == "nt")
return file_comp('n', lhs, rhs);
else if(op == "ot")
return file_comp('o', lhs, rhs);
else if(op == "ef")
return file_comp('e', lhs, rhs);
// We do not support arithmetic expressions inside keyword test for now.
// So the operands can only be raw integers.
else if(op == "eq")
return boost::lexical_cast<int>(lhs) == boost::lexical_cast<int>(rhs);
else if(op == "ne")
return boost::lexical_cast<int>(lhs) != boost::lexical_cast<int>(rhs);
else if(op == "lt")
return boost::lexical_cast<int>(lhs) < boost::lexical_cast<int>(rhs);
else if(op == "le")
return boost::lexical_cast<int>(lhs) <= boost::lexical_cast<int>(rhs);
else if(op == "gt")
return boost::lexical_cast<int>(lhs) > boost::lexical_cast<int>(rhs);
else if(op == "ge")
return boost::lexical_cast<int>(lhs) >= boost::lexical_cast<int>(rhs);
else
throw interpreter_exception("Unrecognized operator " + op);
}
catch(boost::bad_lexical_cast& e)
{
return false;
}
}
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