contrib/fuzz/xdiff.cc

status: if ui.relative-paths=no, don't use relative paths even with patterns

Without ui.relative-paths or command.status.relative set, you get this
behavior:

  hgext$ hg st
  M hgext/narrow/narrowrepo.py
  hgext$ hg st .
  M narrow/narrowrepo.py
  hgext$ hg st narrow
  M narrow/narrowrepo.py

I think it's surprising that some of those produce relative paths. I
suspect it works that way because "hg st ." was an easy way of getting
relative paths. Perhaps not much thought was given to how it should
behave when the pattern was not ".". It also feels wrong to conflate
the request for relative patterns with matching of of patterns.

Since we can now start fresh and define the behavior of
ui.relative-paths as we want, I suggest we make ui.relative-paths=no
consistently not give relative paths. So that's what this paths starts
doing for `hg status`.

Differential Revision: https://phab.mercurial-scm.org/D5802

/*
 * xdiff.cc - fuzzer harness for thirdparty/xdiff
 *
 * 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 "thirdparty/xdiff/xdiff.h"
#include <inttypes.h>
#include <stdlib.h>

#include "fuzzutil.h"

extern "C" {

int hunk_consumer(long a1, long a2, long b1, long b2, void *priv)
{
	// TODO: probably also test returning -1 from this when things break?
	return 0;
}

int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
	// Don't allow fuzzer inputs larger than 100k, since we'll just bog
	// down and not accomplish much.
	if (Size > 100000) {
		return 0;
	}
	auto maybe_inputs = SplitInputs(Data, Size);
	if (!maybe_inputs) {
		return 0;
	}
	auto inputs = std::move(maybe_inputs.value());
	mmfile_t a, b;

	a.ptr = inputs.left.get();
	a.size = inputs.left_size;
	b.ptr = inputs.right.get();
	b.size = inputs.right_size;
	xpparam_t xpp = {
	    XDF_INDENT_HEURISTIC, /* flags */
	};
	xdemitconf_t xecfg = {
	    XDL_EMIT_BDIFFHUNK, /* flags */
	    hunk_consumer,      /* hunk_consume_func */
	};
	xdemitcb_t ecb = {
	    NULL, /* priv */
	};
	xdl_diff(&a, &b, &xpp, &xecfg, &ecb);
	return 0; // Non-zero return values are reserved for future use.
}

#ifdef HG_FUZZER_INCLUDE_MAIN
int main(int argc, char **argv)
{
	const char data[] = "asdf";
	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
}
#endif

} // extern "C"