/**
* @param array
* @param array
* @param array
* @return int
* */
public function _exec(array $argv, array $envp, array $redirections)
{
$descriptors = $this->descriptors;
foreach ($redirections as $n => $redirection) {
if (is_array($redirection)) {
if (($handle = @fopen($redirection[1], $redirection[0])) === FALSE) {
throw new Error('cannot open file ' . $redirection[1]);
}
$descriptors[$n] = $handle;
} else {
assert(is_int($redirection));
if (!isset($descriptors[$redirection])) {
throw new Error('bad file descriptor ' . $redirection);
}
$descriptors[$n] = $descriptors[$redirection];
}
}
// BREAK
if ($argv[0] === 'break') {
$n = 1;
if (isset($argv[1])) {
$n = intval($argv[1]);
}
throw new BuiltinBreak($n);
// COLON
} else {
if ($argv[0] === ':') {
$this->variables['?'] = 0;
} else {
if ($argv[0] === 'continue') {
$n = 1;
if (isset($argv[1])) {
$n = intval($argv[1]);
}
throw new BuiltinContinue($n);
// DOT
} else {
if ($argv[0] === '.') {
if (!(isset($argv[1]) && ($contents = file_get_contents($argv[1])) !== FALSE)) {
if (!isset($argv[1])) {
throw new Error('.: no file given');
} else {
throw new Error('.: cannot read file');
}
}
$saved_can_read = $this->can_read;
$this->can_read = FALSE;
$saved_tokens = $this->tokens;
$this->tokens = $this->tokenize($contents);
$saved_descriptors = $this->descriptors;
$this->descriptors = $descriptors;
try {
$this->interpretMoreCommands();
} catch (BuiltinReturn $r) {
$this->variables['?'] = $r->getExitStatus();
}
$this->can_read = $saved_can_read;
$this->tokens = $saved_tokens;
$this->descriptors = $saved_descriptors;
// EVAL
} else {
if ($argv[0] === 'eval') {
$newtokens = $this->tokenize(implode(' ', array_slice($argv, 1)));
if (end($newtokens) === ';') {
array_pop($newtokens);
}
$this->tokens = array_merge(array(';'), $newtokens, $this->tokens);
// EXEC
} else {
if ($argv[0] === 'exec') {
if (count($argv) > 1) {
fwrite($descriptors[2], "exec: only file descriptors handling implemented\n");
$this->variables['?'] = 255;
} else {
$this->descriptors = $descriptors;
$this->variables['?'] = 0;
}
// EXIT
} else {
if ($argv[0] === 'exit') {
$n = 0;
if (isset($argv[1])) {
$n = intval($argv[1]);
}
throw new BuiltinExit($n);
// EXPORT
} else {
if ($argv[0] === 'export') {
if (isset($argv[1]) && $argv[1] === '-p') {
foreach ($this->exported as $exported => $_) {
if (isset($this->variables[$exported])) {
fprintf($descriptors[1], "export %s='%s'\n", $exported, $this->variables[$exported]);
} else {
fprintf($descriptors[1], "export %s\n", $exported);
}
}
} else {
foreach (array_slice($argv, 1) as $variable) {
if (strpos($variable, '=') !== FALSE) {
list($variable, $value) = explode('=', $variable, 2);
$this->variables[$variable] = $value;
}
$this->exported[$variable] = TRUE;
}
}
$this->variables['?'] = 0;
// READONLY
} else {
if ($argv[0] === 'readonly') {
fwrite($descriptors[2], "readonly: currently not supported\n");
$this->variables['?'] = 255;
// RETURN
} else {
if ($argv[0] === 'return') {
$n = 0;
if (isset($argv[1])) {
$n = intval($argv[1]);
}
throw new BuiltinReturn($n);
// SET
} else {
if ($argv[0] === 'set') {
fwrite($descriptors[2], "set: currently not supported\n");
$this->variables['?'] = 255;
// SHIFT
} else {
if ($argv[0] === 'shift') {
$n = 1;
if (isset($argv[1])) {
$n = intval($argv[1]);
}
for ($i = 1, $c = count($this->argv); $i < $c; ++$i) {
unset($this->variables[$i]);
}
foreach (array_slice($this->argv, count($this->argv) - $this->variables['#'] + $n) as $i => $arg) {
$this->variables[$i + 1] = $arg;
}
$this->variables['#'] = $this->variables['#'] - $n;
$this->variables['?'] = 0;
// TIMES
} else {
if ($argv[0] === 'times') {
fwrite($descriptors[2], "times: currently not supported\n");
$this->variables['?'] = 255;
// TRAP
} else {
if ($argv[0] === 'trap') {
fwrite($descriptors[2], "trap: currently not supported\n");
$this->variables['?'] = 255;
// UNSET
} else {
if ($argv[0] === 'unset') {
if (count($argv) < 2) {
fwrite($descriptors[2], "unset: [-fv] name...\n");
$this->variables['?'] = 255;
} else {
if ($argv[1] === '-f') {
foreach (array_slice($argv, 2) as $function) {
unset($this->functions[$function]);
}
} else {
$variables = array_slice($argv, 1);
if ($argv[1] === '-v') {
$variables = array_slice($argv, 2);
}
foreach ($variables as $variable) {
unset($this->variables[$variable]);
}
}
$this->variables['?'] = 0;
}
// FUNCTION?
} else {
if (isset($this->functions[$argv[0]])) {
$saved_argv = $this->argv;
$this->argv = $argv;
$saved_envp = $this->envp;
$this->envp = $envp;
$saved_variables = $this->variables;
$this->variables = array();
$this->variables['#'] = count($argv) - 1;
foreach ($argv as $k => $v) {
$this->variables[$k] = $v;
}
$saved_can_read = $this->can_read;
$this->can_read = FALSE;
$saved_tokens = $this->tokens;
$this->tokens = $this->functions[$argv[0]];
$this->interpretMoreCommands();
$saved_variables['?'] = isset($this->variables['?']) ? $this->variables['?'] : 0;
$this->argv = $saved_argv;
$this->envp = $saved_envp;
$this->variables = $saved_variables;
$this->can_read = $saved_can_read;
$this->tokens = $saved_tokens;
return $this->variables['?'];
// EXTERNAL EXECUTOR
} else {
$this->variables['?'] = $this->executor->exec($argv, $envp, $descriptors);
if ($this->variables['?'] === 127 && $this->interactive) {
fwrite($this->stderr, "sh: " . $argv[0] . " not found\r\n");
}
return $this->variables['?'];
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}