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// file : tests/test/script/runner/driver.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <limits> // numeric_limits
#include <string>
#include <cstdlib> // abort()
#include <cassert>
#include <ostream> // endl, *bit
#include <istream> // istream::traits_type::eof()
#include <iostream>
#include <exception>
#include <libbutl/path.mxx>
#include <libbutl/optional.mxx>
#include <libbutl/fdstream.mxx>
#include <libbutl/filesystem.mxx>
using namespace std;
using namespace butl;
// Call itself recursively causing stack overflow. Parameterized to avoid
// "stack overflow" warning.
//
static void
stack_overflow (bool overflow)
{
if (overflow)
stack_overflow (true);
}
int
main (int argc, char* argv[])
{
using butl::optional;
// Usage: driver [-i <int>] (-o <string>)* (-e <string>)* (-f <file>)*
// (-d <dir>)* [(-t (a|m|s|z)) | (-s <int>)]
//
// Execute actions specified by -i, -o, -e, -f, -d options in the order as
// they appear on the command line. After that terminate abnormally if -t
// option is provided, otherwise exit normally with the status specified by
// -s option (0 by default).
//
// -i <fd>
// Forward STDIN data to the standard stream denoted by the file
// descriptor. Read and discard if 0.
//
// -o <string>
// Print the line to STDOUT.
//
// -e <string>
// Print the line to STDERR.
//
// -f <path>
// Create an empty file with the path specified.
//
// -d <path>
// Create a directory with the path specified. Create parent directories
// if required.
//
// -t <method>
// Abnormally terminate itself using one of the following methods:
//
// a - call abort()
// m - dereference null-pointer
// s - cause stack overflow using infinite function call recursion
// z - divide integer by zero
//
// -s <int>
// Exit normally with the status specified. The default status is 0.
//
int ifd (3);
optional<int> status;
char aterm ('\0'); // Abnormal termination method.
cin.exceptions (ostream::failbit | ostream::badbit);
cout.exceptions (ostream::failbit | ostream::badbit);
cerr.exceptions (ostream::failbit | ostream::badbit);
for (int i (1); i < argc; ++i)
{
string o (argv[i++]);
assert (i < argc);
string v (argv[i]);
auto toi = [] (const string& s) -> int
{
int r (-1);
try
{
size_t n;
r = stoi (s, &n);
assert (n == s.size ());
}
catch (const exception&)
{
assert (false);
}
return r;
};
if (o == "-i")
{
assert (ifd == 3); // Make sure is not set yet.
ifd = toi (v);
assert (ifd >= 0 && ifd < 3);
if (ifd == 0)
cin.ignore (numeric_limits<streamsize>::max ());
else if (cin.peek () != istream::traits_type::eof ())
{
ostream& o (ifd == 1 ? cout : cerr);
o << cin.rdbuf ();
o.flush ();
}
}
else if (o == "-o")
{
cout << v << endl;
}
else if (o == "-e")
{
cerr << v << endl;
}
else if (o == "-f")
{
ofdstream os (v);
os.close ();
}
else if (o == "-d")
{
try_mkdir_p (dir_path (v));
}
else if (o == "-t")
{
assert (aterm == '\0' && !status); // Make sure exit method is not set.
assert (v.size () == 1 && v.find_first_of ("amsz") != string::npos);
aterm = v[0];
}
else if (o == "-s")
{
assert (!status && aterm == '\0'); // Make sure exit method is not set.
status = toi (v);
}
else
assert (false);
}
switch (aterm)
{
case 'a': abort (); break;
case 'm':
{
int* p (nullptr);
*p = 0;
break;
}
case 's': stack_overflow (true); break;
case 'z':
{
int z (0);
z /= z;
break;
}
}
return status ? *status : 0;
}
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