name : stdlib-bsearch.h /* Perform binary search - inline version. Copyright (C) 1991-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ __extern_inline void * bsearch (const void *__key, const void *__base, size_t __nmemb, size_t __size, __compar_fn_t __compar) { size_t __l, __u, __idx; const void *__p; int __comparison; __l = 0; __u = __nmemb; while (__l < __u) { __idx = (__l + __u) / 2; __p = (void *) (((const char *) __base) + (__idx * __size)); __comparison = (*__compar) (__key, __p); if (__comparison < 0) __u = __idx; else if (__comparison > 0) __l = __idx + 1; else return (void *) __p; } return NULL; }