templates: add filter to reverse list
The filter supports only lists because for lists, it’s straightforward to
implement. Reversing text doesn’t seem very useful and is hard to implement.
Reversing the bytes would break multi-bytes encodings. Reversing the code
points would break characters consisting of multiple code points. Reversing
graphemes is non-trivial without using a library not included in the standard
library.
#include "pyutil.h"
#include <iostream>
#include <string>
namespace contrib
{
#if PY_MAJOR_VERSION >= 3
#define HG_FUZZER_PY3 1
PyMODINIT_FUNC PyInit_parsers(void);
#else
PyMODINIT_FUNC initparsers(void);
#endif
static char cpypath[8192] = "\0";
static PyObject *mainmod;
static PyObject *globals;
void initpy(const char *cselfpath)
{
#ifdef HG_FUZZER_PY3
const std::string subdir = "/sanpy/lib/python3.8";
#else
const std::string subdir = "/sanpy/lib/python2.7";
#endif
/* HACK ALERT: we need a full Python installation built without
pymalloc and with ASAN, so we dump one in
$OUT/sanpy/lib/python2.7. This helps us wire that up. */
std::string selfpath(cselfpath);
std::string pypath;
auto pos = selfpath.rfind("/");
if (pos == std::string::npos) {
char wd[8192];
if (!getcwd(wd, 8192)) {
std::cerr << "Failed to call getcwd: errno " << errno
<< std::endl;
exit(1);
}
pypath = std::string(wd) + subdir;
} else {
pypath = selfpath.substr(0, pos) + subdir;
}
strncpy(cpypath, pypath.c_str(), pypath.size());
setenv("PYTHONPATH", cpypath, 1);
setenv("PYTHONNOUSERSITE", "1", 1);
/* prevent Python from looking up users in the fuzz environment */
setenv("PYTHONUSERBASE", cpypath, 1);
#ifdef HG_FUZZER_PY3
std::wstring wcpypath(pypath.begin(), pypath.end());
Py_SetPythonHome(wcpypath.c_str());
#else
Py_SetPythonHome(cpypath);
#endif
Py_InitializeEx(0);
mainmod = PyImport_AddModule("__main__");
globals = PyModule_GetDict(mainmod);
#ifdef HG_FUZZER_PY3
PyObject *mod = PyInit_parsers();
#else
initparsers();
PyObject *mod = PyImport_ImportModule("parsers");
#endif
PyDict_SetItemString(globals, "parsers", mod);
}
PyObject *pyglobals()
{
return globals;
}
} // namespace contrib