gecko-dev/xpcom/string/nsStringComparator.cpp

40 строки
1.4 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <ctype.h>
#include "nsAString.h"
#include "plstr.h"
#include "nsTStringComparator.cpp"
int nsCaseInsensitiveCStringComparator(const char* aLhs, const char* aRhs,
uint32_t aLhsLength,
uint32_t aRhsLength) {
#if defined(LIBFUZZER) && defined(LINUX)
// Make sure libFuzzer can see this string compare by calling the POSIX
// native function which is intercepted. We also call this if the lengths
// don't match so libFuzzer can at least see a partial string, but we throw
// away the result afterwards again.
int32_t result =
int32_t(strncasecmp(aLhs, aRhs, std::min(aLhsLength, aRhsLength)));
if (aLhsLength != aRhsLength) {
return (aLhsLength > aRhsLength) ? 1 : -1;
}
#else
if (aLhsLength != aRhsLength) {
return (aLhsLength > aRhsLength) ? 1 : -1;
}
int32_t result = int32_t(PL_strncasecmp(aLhs, aRhs, aLhsLength));
#endif
// Egads. PL_strncasecmp is returning *very* negative numbers.
// Some folks expect -1,0,1, so let's temper its enthusiasm.
if (result < 0) {
result = -1;
}
return result;
}