view contrib/fuzz/bdiff.cc @ 46017:068307b638f4

statprof: fix off-by-one-line error in output

martinvonz claims they thought that this was intentional, but couldn't remember
the reasoning for it. I can't understand why it would be preferable, and I
didn't see anything in the comments in the file about why this would be useful,
so I'm hopefully not breaking anything by "fixing" it.

### Old output

```
| 100.0%  0.01s  dispatch.py:    run               line 43:  dispatch.run()
| 100.0%  0.01s  dispatch.py:    dispatch          line 115:  status = dispatch(req)
| 100.0%  0.01s  dispatch.py:    _runcatch         line 266:  ret = _runcatch(req) or 0
| 100.0%  0.01s  dispatch.py:    _callcatch        line 442:  return _callcatch(ui, _runc...
| 100.0%  0.01s  scmutil.py:     callcatch         line 451:  return scmutil.callcatch(ui...
| 100.0%  0.01s  dispatch.py:    _runcatchfunc     line 155:  return func()
| 100.0%  0.01s  dispatch.py:    _dispatch         line 432:  return _dispatch(req)
| 100.0%  0.01s  hg.py:          repository        line 1179:  repo = hg.repository(
| 100.0%  0.01s  hg.py:          _peerorrepo       line 221:  peer = _peerorrepo(
| 100.0%  0.01s  util.py:        __getattribute__  line 188:  obj = _peerlookup(path).ins...
| 100.0%  0.01s  localrepo.py:   makelocalrepositoryline 3227:  return makelocalrepository(...
| 100.0%  0.01s  localrepo.py:   __init__          line 683:  return cls(
| 100.0%  0.01s  util.py:        __getattribute__  line 1262:  self._extrafilterid = repov...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: exec_moduleline          245:  self.__spec__.loader.exec_m...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: get_codeline       779:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: path_statsline         868:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: _path_statline         1012:
```

### New output

```
| 100.0%  0.01s  hg:             <module>          line 43:  dispatch.run()
| 100.0%  0.01s  dispatch.py:    run               line 115:  status = dispatch(req)
| 100.0%  0.01s  dispatch.py:    dispatch          line 266:  ret = _runcatch(req) or 0
| 100.0%  0.01s  dispatch.py:    _runcatch         line 442:  return _callcatch(ui, _runc...
| 100.0%  0.01s  dispatch.py:    _callcatch        line 451:  return scmutil.callcatch(ui...
| 100.0%  0.01s  scmutil.py:     callcatch         line 155:  return func()
| 100.0%  0.01s  dispatch.py:    _runcatchfunc     line 432:  return _dispatch(req)
| 100.0%  0.01s  dispatch.py:    _dispatch         line 1179:  repo = hg.repository(
| 100.0%  0.01s  hg.py:          repository        line 221:  peer = _peerorrepo(
| 100.0%  0.01s  hg.py:          _peerorrepo       line 188:  obj = _peerlookup(path).ins...
| 100.0%  0.01s  localrepo.py:   instance          line 3227:  return makelocalrepository(...
| 100.0%  0.01s  localrepo.py:   makelocalrepositoryline 683:  return cls(
| 100.0%  0.01s  localrepo.py:   __init__          line 1262:  self._extrafilterid = repov...
| 100.0%  0.01s  util.py:        __getattribute__  line 245:  self.__spec__.loader.exec_m...
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: exec_moduleline          779:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: get_codeline       868:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: path_statsline         1012:
| 100.0%  0.01s  <frozen importlib._bootstrap_external>: _path_statline         87:
```

Differential Revision: https://phab.mercurial-scm.org/D9510

/*
 * bdiff.cc - fuzzer harness for bdiff.c
 *
 * Copyright 2018, Google Inc.
 *
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 */
#include <memory>
#include <stdlib.h>

#include "FuzzedDataProvider.h"

extern "C" {
#include "bdiff.h"

extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv)
{
	return 0;
}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
	FuzzedDataProvider provider(Data, Size);
	std::string left = provider.ConsumeRandomLengthString(Size);
	std::string right = provider.ConsumeRemainingBytesAsString();

	struct bdiff_line *a, *b;
	int an = bdiff_splitlines(left.c_str(), left.size(), &a);
	int bn = bdiff_splitlines(right.c_str(), right.size(), &b);
	struct bdiff_hunk l;
	bdiff_diff(a, an, b, bn, &l);
	free(a);
	free(b);
	bdiff_freehunks(l.next);
	return 0; // Non-zero return values are reserved for future use.
}

} // extern "C"