/**************************************************************************** * libs/libc/string/lib_memcmp.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include /**************************************************************************** * Public Functions ****************************************************************************/ #ifndef CONFIG_LIBC_ARCH_MEMCMP #undef memcmp /* See mm/README.txt */ no_builtin("memcmp") int memcmp(FAR const void *s1, FAR const void *s2, size_t n) { unsigned char *p1 = (unsigned char *)s1; unsigned char *p2 = (unsigned char *)s2; while (n-- > 0) { if (*p1 < *p2) { return -1; } else if (*p1 > *p2) { return 1; } p1++; p2++; } return 0; } #endif