aboutsummaryrefslogtreecommitdiff
path: root/tests/test/script/runner/driver.cxx
blob: 6a3698fcdd4e872da7f734d494944376cc9e1431 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// file      : tests/test/script/runner/driver.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// 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 <butl/path>
#include <butl/optional>
#include <butl/fdstream>
#include <butl/filesystem>

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[])
{
  // 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.

  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;
}