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Diffstat (limited to '')
-rw-r--r-- | src/VBox/Runtime/common/sort/nocrt-bsearch.cpp | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/sort/nocrt-bsearch.cpp b/src/VBox/Runtime/common/sort/nocrt-bsearch.cpp new file mode 100644 index 00000000..746764d1 --- /dev/null +++ b/src/VBox/Runtime/common/sort/nocrt-bsearch.cpp @@ -0,0 +1,80 @@ +/* $Id: nocrt-bsearch.cpp $ */ +/** @file + * IPRT - No-CRT - bsearch(). + */ + +/* + * Copyright (C) 2022-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define IPRT_NO_CRT_FOR_3RD_PARTY +#include "internal/nocrt.h" +#include <iprt/nocrt/stdlib.h> + + +void *RT_NOCRT(bsearch)(const void *pvKey, const void *pvBase, size_t cEntries, size_t cbEntry, + int (*pfnCompare)(const void *pvKey, const void *pvEntry)) +{ + if (cEntries > 0) + { /* likely */ } + else + return NULL; + + size_t iStart = 0; + size_t iEnd = cEntries; + for (;;) + { + size_t const i = (iEnd - iStart) / 2 + iStart; + const void * const pvEntry = (const char *)pvBase + cbEntry * i; + int const iDiff = pfnCompare(pvKey, pvEntry); + if (iDiff > 0) /* target is before i */ + { + if (i > iStart) + iEnd = i; + else + return NULL; + } + else if (iDiff) /* target is after i */ + { + if (i + 1 < iEnd) + iStart = i + 1; + else + return NULL; + } + else /* match */ + return (void *)pvEntry; + } +} +RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(bsearch); + |